Display control system and control method based on human body induction and light intensity detection

Abstract

The invention discloses a display control system and method based on human body induction and light intensity detection. The display control system comprises a main control module, a human body induction module, a light intensity detection module, a display driving module and a nixie tube display module. The human body induction module is electrically connected with the main control module, the light intensity detection module is in communication connection with the main control module, the display driving module is electrically connected with the main control module and the nixie tube display module, and the main control module is configured to respond to an effective induction signal output by the human body induction module and control the nixie tube display module to be converted into a working mode from a sleep mode; and the control module is used for acquiring environment illumination intensity data sent by the light intensity detection module, and controlling the nixie tube display module to display at different preset brightness levels according to different intensity intervals in which the environment illumination intensity data is located. According to the display control system, display closing in an unmanned state is realized to reduce energy consumption, and intelligent awakening is realized without manual operation.

Description

Technical Field

[0001] This invention relates to the field of dishwasher display technology, specifically to a display control system and control method based on human body sensing and light intensity detection. Background Technology

[0002] As a common modern kitchen appliance, dishwashers typically feature a digital tube or LED display panel to show information such as operating status, remaining time, and washing mode. Currently, most dishwashers' displays are always on, meaning the screen remains lit at a fixed brightness during standby or operation. This existing display structure has the following shortcomings in use: 1) High energy consumption; the display continues to work even when no one is operating it, causing unnecessary energy consumption. 2) The display brightness is fixed and cannot adapt to changing ambient lighting conditions. In a bright environment (such as a kitchen with direct sunlight), the display may be difficult to see due to insufficient brightness; in a dark environment (such as at night), the overly bright display will be dazzling and affect user comfort. 3) Long-term high-brightness operation will also accelerate the light decay of LEDs or digital tubes and shorten their lifespan. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the deficiencies of the existing technology by providing a display control system and control method that enables the display to be turned off when no one is using it to reduce energy consumption, dynamically adjusts the brightness according to the ambient light to improve user comfort, extends the life of the digital tube display module, and simultaneously achieves intelligent wake-up, eliminates the need for manual operation, and improves the intelligence level of the dishwasher.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention provides a display control system based on human body sensing and light intensity detection, the display control system including a main control module, a human body sensing module, a light intensity detection module, a display driving module, and a digital tube display module; The human body sensing module is electrically connected to the main control module and is used to detect whether the user is approaching and output a sensing signal to the main control module. The light intensity detection module is communicatively connected to the main control module and is used to collect ambient light intensity data in real time and send it to the main control module. The display driver module is electrically connected to the main control module and the digital tube display module respectively, and is used to drive the digital tube display module to display information according to the control instructions of the main control module. The main control module is configured as follows: In response to a valid sensing signal output by the human body sensing module, the digital tube display module is controlled to switch from sleep mode to working mode. The system acquires ambient light intensity data sent by the light intensity detection module and controls the digital tube display module to display at different preset brightness levels according to the different intensity ranges of the ambient light intensity data.

[0005] Furthermore, the main control module is configured to execute the following brightness adjustment logic: Compare the ambient light intensity with at least one preset threshold; Based on the comparison results, the display brightness of the digital tube display module is switched to a preset brightness level corresponding to the current ambient light intensity range.

[0006] Furthermore, the brightness adjustment logic includes: When the ambient light intensity is less than the first threshold, the digital tube display module is controlled to display at the first brightness level; When the ambient light intensity is greater than or equal to the first threshold and less than the second threshold, the digital tube display module is controlled to display at a second brightness level that is higher than the first brightness level. When the ambient light intensity is greater than or equal to the second threshold, the digital tube display module is controlled to display at a third brightness level that is higher than the second brightness level.

[0007] Furthermore, the brightness adjustment logic also includes: A third threshold is set, wherein the third threshold is less than the first threshold; When the ambient light intensity is less than the third threshold, the digital tube display module is controlled to display at a brightness lower than the upper limit of the first brightness level.

[0008] Furthermore, the display control system includes a button touch module, which is electrically connected to the main control module.

[0009] Furthermore, the main control module is configured as follows: When the display control system is in a non-working state and no user interaction is detected, it enters a low-power sleep mode and shuts down the power supply to the display driver module and at least one other peripheral module, while maintaining the function of receiving interrupt signals. The main control module is configured to exit the low-power sleep mode, start the display driver module, and restore the normal function of the device in response to a wake-up interrupt signal from the human body sensing module or a key interrupt signal from the user key touch module.

[0010] Furthermore, the main control module includes a main control chip MCU1, a power board communication port CN1, resistors R22 and R23. One end of resistor R22 and one end of resistor R23 are electrically connected to pins 5 and 6 of the main control chip MCU1, respectively. The other ends of resistor R22 and R23 are electrically connected to pins 4 and 3 of the power board communication port CN1, respectively. The main control chip MCU1 is electrically connected to the power board communication port CN1 through resistors R22 and R23. The main control chip MCU1 is also electrically connected to a human body sensing module, a light intensity detection module, and a display driver module.

[0011] Furthermore, the human body sensing module includes a microwave radar module CN2 and a signal processing circuit. The second pin of the microwave radar module CN2 is electrically connected to the signal processing circuit, and the signal processing circuit is electrically connected to the 16th pin of the main control chip MCU1. The microwave radar module CN2 is electrically connected to the 16th pin of the main control chip MCU1 through the signal processing circuit.

[0012] Furthermore, the light intensity detection module includes a light sensor chip IC2B, resistors R5, R6, and R7. One end of resistor R5, one end of resistor R6, and one end of resistor R7 are electrically connected to pins 6, 5, and 4 of the light sensor chip IC2B, respectively. The other end of resistor R5 and the other end of resistor R7 are electrically connected to pins 14 and 13 of the main control chip MCU1, respectively.

[0013] On the other hand, the present invention also provides a display control method based on human body sensing and light intensity detection, the display control method comprising the following steps: Step S1: Power on and initialize the system, and configure the parameters of each module; Step S2: Monitor the sensing signal output by the human body sensing module in real time; Step S3: When a valid sensing signal is detected, wake up the display system; Step S4: Read ambient light intensity data from the light intensity detection module in real time or periodically; Step S5: Determine the target brightness level based on the ambient light intensity data and according to the preset brightness adjustment logic; Step S6: Generate a control command containing the target brightness level and send it to the display driver module to drive the digital tube display module to display information according to the target brightness. Step S7: After the sensing signal disappears and continues for a predetermined delay time, the control display system is turned off.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The display control system of this invention includes a main control module, a human body sensing module, a light intensity detection module, a display driving module, and a digital tube display module. The human body sensing module is electrically connected to the main control module and is used to detect whether a user is approaching and output a sensing signal to the main control module. The light intensity detection module is communicatively connected to the main control module and is used to collect ambient light intensity data in real time and send it to the main control module. The display driving module is electrically connected to both the main control module and the digital tube display module and is used to drive the digital tube display module to display information according to the control instructions of the main control module. The main control module is configured to: respond to the valid sensing signal output by the human body sensing module, control the digital tube display module to switch from sleep mode to working mode; acquire the ambient light intensity data sent by the light intensity detection module, and control the digital tube display module to display at different preset brightness levels according to the different intensity ranges of the ambient light intensity data. The display control system of this invention can realize display shutdown to reduce energy consumption when no one is present, dynamically adjust brightness according to ambient light to improve user comfort, extend the life of digital tube display module components, and realize intelligent wake-up without manual operation, thus improving the intelligence level of the dishwasher. Attached Figure Description

[0015] Figure 1 This is a schematic diagram showing the signal flow of each circuit module of the display control system of the present invention; Figure 2 This is the circuit schematic diagram of the main control module of the present invention; Figure 3 This is a circuit diagram of the human body sensing module of the present invention; Figure 4 This is a circuit diagram of the light intensity detection module of the present invention; Figure 5 This is a circuit schematic diagram of the power conversion module of the present invention; Figure 6 This is a circuit schematic diagram of the display driver module of the present invention; Figure 7 This is a circuit diagram of the digital tube display module of the present invention; Figure 8 This is the circuit schematic diagram of the main control module of the present invention; Figure 9 This is a circuit diagram of the button touch module and button indicator module of the present invention. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings, which form part of this specification. The principles of the invention are illustrated by means of embodiments, and other aspects, features, and advantages of the invention will become apparent from this detailed description. In the accompanying drawings, the same or similar parts in different figures are indicated by the same reference numerals.

[0017] like Figures 1-8As shown, this invention provides a display control system based on human body sensing and light intensity detection. The display control system includes a main control module, a human body sensing module, a light intensity detection module, a display driver module, and a digital tube display module. The human body sensing module is electrically connected to the main control module and is used to detect whether a user is approaching and output a sensing signal to the main control module. The light intensity detection module is communicatively connected to the main control module and is used to collect ambient light intensity data in real time and send it to the main control module. The display driver module is electrically connected to both the main control module and the digital tube display module and is used to drive the digital tube display module to display information according to the control instructions of the main control module. The main control module is configured to: respond to a valid sensing signal output by the human body sensing module, control the digital tube display module to switch from sleep mode to working mode; acquire ambient light intensity data sent by the light intensity detection module, and control the digital tube display module to display at different preset brightness levels according to the different intensity ranges of the ambient light intensity data. The display control system of this invention achieves automatic wake-up and slewing of the display through a human body sensing module. The display turns off when no one is present, reducing energy consumption compared to existing always-on display solutions. It automatically turns on when a user approaches, eliminating the need for manual operation and providing a better user experience. A light intensity detection module collects ambient light data in real time and dynamically adjusts the display brightness, achieving adaptive brightness adjustment based on ambient light. This solves the problems of unclear visibility in strong light and glare in low light or dark environments, improving user comfort and adapting to various lighting conditions. This invention achieves "screen on when someone approaches, screen off when someone leaves" in the display control system, effectively saving energy. The display brightness automatically optimizes according to ambient light, always providing a comfortable visual experience, and the low-power mode further extends product lifespan.

[0018] In this embodiment of the invention, an effective sensing signal refers to the detection that a user has entered a preset sensing range.

[0019] The main control module of this invention is configured to execute the following brightness adjustment logic: Compare the ambient light intensity with at least one preset threshold; Based on the comparison results, the display brightness of the digital tube display module is switched to a preset brightness level corresponding to the current ambient light intensity range.

[0020] The brightness adjustment logic includes: When the ambient light intensity is less than the first threshold, the digital tube display module is controlled to display at the first brightness level. When the ambient light intensity is greater than or equal to the first threshold and less than the second threshold, the digital tube display module is controlled to display at the second brightness level, which is higher than the first brightness level. When the ambient light intensity is greater than or equal to the second threshold, the digital tube display module is controlled to display at a third brightness level, which is higher than the second brightness level.

[0021] The brightness adjustment logic of the present invention also includes: Set a third threshold, which is less than the first threshold; When the ambient light intensity is less than the third threshold, the digital tube display module is controlled to display at a brightness lower than the upper limit of the first brightness level.

[0022] In a specific implementation of this invention, the brightness adjustment logic is as follows: when the illuminance is <50 lux, it is set to a low brightness level, and the digital tube display module is controlled to display at a low brightness level; when the illuminance is 50 lux ≤ illuminance ≤ 500 lux, it is set to medium brightness, and the digital tube display module is controlled to display at a medium brightness level; when the illuminance is >500 lux, it is set to high brightness, and the digital tube display module is controlled to display at a high brightness level; furthermore, when the illuminance is <10 lux, the maximum brightness is forcibly limited to a lower level.

[0023] The display control system of the present invention includes a button touch module, which is electrically connected to the main control module.

[0024] The main control module is configured as follows: When the display control system is in a non-working state and no user interaction is detected, it enters a low-power sleep mode and shuts down the power supply to the display driver module and at least one other peripheral module, while maintaining the function of receiving interrupt signals. The main control module is configured to respond to a wake-up interrupt signal from the human body sensor module or a key interrupt signal from the user key touch module, exit the low-power sleep mode, start the display driver module, and restore the normal function of the device.

[0025] In practice, the main control module maps ambient light intensity data to corresponding brightness level indexes using a lookup table method. The brightness level indexes correspond to the duty cycle levels supported by the display driver module.

[0026] The main control module of this invention includes a main control chip MCU1, a power board communication port CN1, resistors R22 and R23. One end of resistor R22 and one end of resistor R23 are electrically connected to pins 5 and 6 of the main control chip MCU1, respectively. The other end of resistor R22 and the other end of resistor R23 are electrically connected to pins 4 and 3 of the power board communication port CN1, respectively. The main control chip MCU1 is electrically connected to the power board communication port CN1 through resistors R22 and R23. The main control chip MCU1 is also electrically connected to a human body sensing module, a light intensity detection module, and a display driver module. In this embodiment of the invention, the main control chip MCU1 is an enhanced microcontroller of model SC95F8522. The main control chip MCU1 operates at 5V, has multiple built-in GPIO ports, is suitable for home appliance control scenarios, supports low power mode, and can effectively reduce system standby power consumption. It is also equipped with a timer, an external interrupt interface, and a touch interrupt interface. The external interrupt interface is used to monitor the wake-up signal output by the human body sensing module in real time. The touch interrupt interface is used to detect the pressing state of the touch button and generate a button trigger signal. The timer is used to implement signal sampling, data acquisition, and delay control functions. The main control unit is the core control component of the display control system. It is responsible for receiving the high and low level signals output by the human body sensing module and the light intensity data transmitted by the light intensity detection module. Through the built-in program, it executes logical judgments to generate display control instructions (turning the display on / off, switching display content) and brightness adjustment signals, and transmits them to the display driver module through SPI communication. At the same time, it realizes the system's sleep, wake-up, and fault-tolerant control functions.

[0027] The human body sensing module of this invention includes a microwave radar module CN2 and a signal processing circuit. Pin 2 of the microwave radar module CN2 is electrically connected to the signal processing circuit, which is electrically connected to pin 16 of the main control chip MCU1. In this embodiment, the microwave radar module CN2 is a 5.8GHz microwave radar module. Its output is electrically connected to the main control chip MCU1 via a signal processing circuit. This 5.8GHz microwave radar control module transmits and receives 5.8GHz electromagnetic waves, utilizing the Doppler effect to detect the approach of a human body or object. The sensing distance can be stably maintained between 0.1 and 1 meter, meeting the distance requirements for dishwasher user interaction. The output of the microwave radar control module outputs high and low level signals according to the detection status. When a user is detected approaching, a high level is output; when no user is approaching, a low level is output. This signal is transmitted to pin 16 of the main control chip MCU1, providing a trigger signal for waking up or turning off the display.

[0028] In a specific implementation, the signal processing circuit includes a current-limiting resistor R27, a pull-down resistor R29, and a filter capacitor C11. One end of the current-limiting resistor R27 is electrically connected to the second pin of the microwave radar module CN2, and the other end of the current-limiting resistor R27 is electrically connected to one end of the pull-down resistor R29, one end of the filter capacitor C11, and the 16th pin of the main control chip MCU1.

[0029] The second pin (i.e., the output terminal) of the microwave radar module CN2 of the present invention is connected to the 16th pin of the main control chip MCU1 through a series current limiting resistor R27. The 16th pin of the main control chip MCU1 is configured as a GPIO input mode, active high. At the same time, the 16th pin of the main control chip MCU1 is connected to GND through a pull-down resistor R29. A filter capacitor C11 is also connected in parallel to GND between the second pin of the microwave radar module CN2 and the 16th pin of the main control chip MCU1 to form an RC filter circuit.

[0030] The light intensity detection module of this invention includes a light sensor chip IC2B, resistors R5, R6, and R7. One end of resistor R5, one end of resistor R6, and one end of resistor R7 are electrically connected to pins 6, 5, and 4 of the light sensor chip IC2B, respectively. The other ends of resistors R5 and R7 are electrically connected to pins 14 and 13 of the main control chip MCU1, respectively. The light sensor chip used in this invention is a BH1750 digital light intensity sensor (IC2B), which has a detection range of 0-65535 lux, high measurement accuracy, and fast response speed. It interacts with the main control chip MCU1 via the IIC communication protocol. Pin 4 (i.e., the SDA pin) of the light sensor chip is connected to pin 13 of the main control chip MCU1, and pin 4 (i.e., the SCL pin) of the light sensor chip is connected to pin 14 of the main control chip MCU1. It collects ambient light intensity data in real time and transmits it to the main control chip MCU1, providing data support for adaptive brightness adjustment.

[0031] The display control system of the present invention includes a power conversion module, which is electrically connected to a light intensity detection module. The power conversion module includes a DC-DC chip IC3, a resistor R17, and a capacitor C9. One end of the resistor R17 is connected to pin 2 of the DC-DC chip IC3 and one end of the capacitor C9. The DC-DC chip IC3 outputs 3.3V through the resistor R17 and the capacitor C9 and is electrically connected to pin 1 of the light sensor chip IC2B.

[0032] The pin connections for the BH1750 light sensor chip IC2B are as follows: Pin 1 (VCC pin): Electrically connected to the 3.3V power output from the power conversion module, used to obtain operating power; Pin 3 (GND pin): Directly grounded to achieve zero potential reference for the circuit; Pin 6 (i.e. SCL pin): serves as the I2C communication clock line and is electrically connected to pin 14 of the external main control chip MCU1. Pin 5 (i.e. SDA pin): As an I2C communication data line, it is electrically connected to pin 13 of the external main control chip MCU1 through resistor R7. Pin 2 (i.e., ADDR pin): This is the address selection terminal, used to configure the communication address of the light sensor chip and avoid communication conflicts between multiple devices. Pin 4 (i.e., DVI pin): This is the data output terminal, used for backup data transmission.

[0033] In specific implementation, the display driver module includes a display driver control chip IC1, a transistor Q1, resistors R31, R1, R2, and R3. The collector of transistor Q1 is electrically connected to pin 21 of the display driver control chip IC1. One end of resistor R31 is electrically connected to the base of transistor Q1, and the other end of resistor R31 is electrically connected to pin 12 of the main control chip MCU1. The display driver control chip IC1 is electrically connected to the digital tube display module. One end of resistors R1, R2, and R3 is electrically connected to pins 2, 3, and 4 of the display driver control chip IC1, respectively, and the other end of resistors R1, R2, and R3 is electrically connected to pins 7, 8, and 9 of the main control chip MCU1, respectively.

[0034] In this embodiment of the invention, the display driver control chip IC1 is a TM1628 display driver control chip. The TM1628 display chip has a DIO data pin, a SIB control pin, and a CLK clock pin, which are used to realize data transmission, signal control, and clock synchronization. The selected TM1628 display driver control chip is a dedicated digital tube or LED display driver chip that supports 8-segment × 16-bit display and can drive multiple digital tubes or LED beads to meet the requirements of dishwasher working status display. The display driver control chip IC1 is electrically connected to the main control chip MCU1 through 3-wire SPI communication (DIO, CLK, STB), and receives control commands and data sent by the main control chip MCU1. It realizes 16-level brightness control through the built-in duty cycle adjustment circuit, and can flexibly adjust the display brightness according to the brightness adjustment command. The digital tube display module is used to intuitively display the dishwasher's working mode (such as standard wash, quick wash, drying, etc.), remaining washing time, and other key information.

[0035] The digital tube display module of this invention has GOM1-GOM2 pins and SEG0-SEG7 segment selection pins. The SEG0-SEG7 segment selection pins of the digital tube display module are electrically connected to pins 15 and 8-14 of the display driver module, respectively, to achieve segment selection control of the digital tube. In this embodiment, the digital tube display module is a common cathode digital tube, and each of its segment selection pins is electrically connected to the SEG series pins of the display driver control chip IC1, so that the display driver control chip IC1 drives the corresponding pins of the digital tube display module to emit light and display.

[0036] The button touch module of the present invention includes a power button K1 for inputting a power-on command, a function selection button K2 for inputting a function selection command, a start / stop button K3 for inputting a start / stop command, and current-limiting resistors R13, R14, and R15. One end of each current-limiting resistor is electrically connected to the power button K1, the function selection button K2, and the start / stop button K3, respectively. The other end of each current-limiting resistor is electrically connected to pins 20, 19, and 18 of the main control chip MCU1, respectively.

[0037] The main control module is further configured to perform signal stabilization processing, which includes: Continuous sampling step: The induced signal is sampled multiple times at fixed time intervals; Valid determination steps: A valid trigger signal is determined only when the signal values ​​sampled multiple times are all at a valid level.

[0038] The anti-shake process also includes a delayed confirmation step: when a valid trigger signal is initially determined, it is sampled and verified again after a confirmation time delay. If the signal remains valid, the trigger is finally confirmed.

[0039] The display control system includes a button indicator module, which is electrically connected to the display driver control chip IC1 and the digital tube display module of the display driver module.

[0040] The button indicator module includes a diode indicator LED1 corresponding to the power button K1 and current-limiting resistor R13, a diode indicator LED2 corresponding to the function selection button K2 and current-limiting resistor R22, a diode indicator LED3 corresponding to the start / stop button K3 and current-limiting resistor R15, resistors R18, R19, and R22, signal connection terminals SEG01, SEG11, and SEG21. One end of resistors R18, R19, and R22 is connected to the positive terminal of diode indicator LED1, the positive terminal of diode indicator LED2, and the diode indicator LED3, respectively. The positive terminal of LED3 is electrically connected. The other ends of resistors R18, R19, and R22 are electrically connected to signal connection terminals SEG01, SEG11, and SEG21, respectively. Resistors R18, R19, and R22 are electrically connected to the digital tube display module through signal connection terminals SEG01, SEG11, and SEG21. The negative terminals of diode indicator LED1, LED2, and LED3 are all electrically connected to the common connection terminal GR4 to achieve the electrical connection between the button indicator module and pin 23 of the display driver control chip IC1.

[0041] Regarding the power-on control process: When the user touches the power button K1, the power button K1 is turned on, generating a power-on command signal; this signal is limited by the current-limiting resistor R13 and then transmitted to pin 20 of the main control chip MUC1; after receiving the power-on command signal, the main control chip MUC1 responds to the command and controls the dishwasher to enter standby mode. At this time, the current-limiting resistor R13 effectively limits the current flowing through the power button K1, preventing the components from being damaged due to overcurrent.

[0042] Regarding the function selection control process: When the dishwasher is in standby mode, the user touches the function selection button K2, which turns on the function selection button K2 and generates a function selection command signal. This signal is then transmitted to pin 19 of the main control chip MUC1 after being current-limited by resistor R22. After receiving the signal, the main control chip MUC1 switches the dishwasher's operating mode (such as standard wash, quick wash, heavy wash, etc.) and outputs a conduction signal through the signal connection terminal SEG11, causing the diode indicator LED2 to form a loop through the common connection terminal GR4. The diode indicator LED2 lights up, indicating that it is currently in the function selection state. Each time the function selection button K2 is touched, the main control chip MUC1 switches the operating mode once. The diode indicator LED2 can distinguish different operating modes by flashing or remaining constantly lit (flashing indicates mode switching, while remaining constantly lit indicates that the current mode is selected).

[0043] Regarding the start / pause control process: After the user selects the working mode, touching the start / stop button K3 will activate K3, generating a start command signal. This signal is then limited by the current-limiting resistor R15 and transmitted to pin 18 of the main control chip MUC1. Upon receiving the signal, the main control chip MUC1 controls the dishwasher's actuator to start and enter the selected working mode. If the start / stop button K3 is touched again during operation, K3 will activate again, generating a pause command signal.

[0044] This invention also provides a display control method based on human body sensing and light intensity detection, comprising the following steps: Step S1: Power on and initialize the system, and configure the parameters of each module; Step S2: Monitor the sensing signal output by the human body sensing module in real time; Step S3: When a valid sensing signal is detected, wake up the display system; Step S4: Read ambient light intensity data from the light intensity detection module in real time or periodically; Step S5: Determine the target brightness level based on the ambient light intensity data and the preset brightness adjustment logic; Step S6: Generate a control command containing the target brightness level and send it to the display driver module to drive the digital tube display module to display information according to the target brightness. Step S7: After the sensing signal disappears and continues for a predetermined delay, the control display system is turned off.

[0045] Example 1 like Figure 9 As shown, the control process of the display control system and control method of the present invention for a dishwasher includes the following steps: Step 1) System Initialization: After the main control chip MCU1 is powered on, it first initializes each peripheral; it executes a specific initialization sequence for the display driver control chip IC1: delay for 10ms to wait for the power supply to stabilize -> send a command to turn off the display (0x80) -> send a command to set the default brightness (e.g., 0x8B, corresponding to a certain brightness level) -> send a command to turn on the display (0x81) -> clear all displays; it initializes the IIC interface to prepare for reading the light sensor chip IC2B, and configures the timer for subsequent scanning and delay; Step 2) Sleep and Wake-up Management: After system initialization, if the dishwasher does not start the washing or reservation program and there is no user interaction for 60 seconds (no one approaches, no buttons are pressed), the main control chip MCU1 enters a low-power sleep mode. In this mode, the main control chip MCU1 shuts down most peripherals (preferably, in this embodiment, it shuts down the communication of the TM1628 display driver control chip and the communication of the light sensor chip IC2B) and internal functional modules to save power, but always keeps the external interrupt function of pin 16 used to connect to the microwave radar module CN2 and the button touch interrupt function enabled. When the human body sensing module detects a human body approaching and outputs a low-to-high level transition, or when the user presses a button, an interrupt is generated to wake up the main control chip MCU1 from sleep mode. After the main control chip MCU1 wakes up, it immediately reinitializes the necessary peripherals (such as timers and SPI) and enters the normal working cycle. Step 3) Human body sensing and display switch control: The main control chip MCU1 continuously monitors the level of pin 12 in the main loop or through the interrupt service routine. To prevent bouncing, a continuous sampling method is used: for example, the pin 12 is sampled every 1ms. When the sampled value is high for 4 consecutive times, it is initially determined that someone is approaching. For further reliability, a 100ms delay timer can be started. After 100ms, the sample is taken again. If it is still high, a valid "user approach" event is finally confirmed. Once confirmed, the main control chip MCU1 immediately controls the display driver control chip IC1 to turn on the display (if it was previously off). When the level of pin 12 becomes low (indicating that the person has left), the main control chip MCU1 starts a 5-second delay timer. If a high level is detected again within 5 seconds, the display off operation is canceled. If it remains low for 5 seconds, the main control chip MCU1 sends a command to the display driver control chip IC1 to turn off the display. If the dishwasher is running a washing program, the display off logic may be shielded or modified, only reducing the brightness without completely turning it off, to ensure that the user can still occasionally check the status. Step 4) Ambient Light Detection and Adaptive Brightness Adjustment: The main control chip MCU1 reads ambient light intensity data (in lux) from the light sensor chip IC2B via the IIC bus every 100ms using a timer (this period is adjustable). The main control chip MCU1 internally has a preset brightness level mapping table, which divides the illumination range into multiple intervals and corresponds to the 8 or 16 levels of duty cycle control values ​​supported by the display driver control chip IC1. This embodiment uses a three-level adjustment logic: a. If the light intensity is <10 lux (e.g., at night), the lowest brightness setting (e.g., duty cycle 10%) of the display driver control chip IC1 will be forced to be used to avoid excessive brightness and glare in dark environments; b. If 10 lux ≤ illuminance < 50 lux (dark environment), set the brightness to low level (preferably 20% duty cycle); c. If 50 lux ≤ illuminance ≤ 500 lux (normal indoor light), set the brightness to medium level (preferably 50% duty cycle); d. If illuminance > 500 lux (bright environment), set the brightness to high level (preferably 100% duty cycle); The main control chip MCU1 quickly determines the current light intensity range and the corresponding target brightness level (i.e., the brightness command parameters of the display driver control chip IC1). Whenever the light intensity data changes and the brightness level needs to be switched, the main control chip MCU1 sends a brightness setting command to the display driver control chip IC1 via the SPI bus (the format is 0x8X, where the lower 4 bits of X represent the brightness level).

[0046] In summary, this invention achieves seamless and smooth adaptive adjustment of display brightness through ambient light sensing, enabling functions such as intelligent wake-up, adaptive brightness adjustment, and low-power sleep mode. It is stable and reliable in operation, providing a good user experience. The entire system enhances the user experience while minimizing energy consumption and helps extend the lifespan of display hardware, making it widely applicable to various smart dishwasher products.

[0047] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of this application. All equivalent changes and modifications made within the scope of this application should still fall within the scope of the present invention.

Claims

1. A display control system based on human body sensing and light intensity detection, characterized in that: The display control system includes a main control module, a human body sensing module, a light intensity detection module, a display driver module, and a digital tube display module; The human body sensing module is electrically connected to the main control module and is used to detect whether the user is approaching and output a sensing signal to the main control module. The light intensity detection module is communicatively connected to the main control module and is used to collect ambient light intensity data in real time and send it to the main control module. The display driver module is electrically connected to the main control module and the digital tube display module respectively, and is used to drive the digital tube display module to display information according to the control instructions of the main control module. The main control module is configured as follows: In response to a valid sensing signal output by the human body sensing module, the digital tube display module is controlled to switch from sleep mode to working mode. The system acquires ambient light intensity data sent by the light intensity detection module and controls the digital tube display module to display at different preset brightness levels according to the different intensity ranges of the ambient light intensity data.

2. The display control system based on human body sensing and light intensity detection according to claim 1, characterized in that: The main control module is configured to execute the following brightness adjustment logic: Compare the ambient light intensity with at least one preset threshold; Based on the comparison results, the display brightness of the digital tube display module is switched to a preset brightness level corresponding to the current ambient light intensity range.

3. The display control system based on human body sensing and light intensity detection according to claim 2, characterized in that: The brightness adjustment logic includes: When the ambient light intensity is less than the first threshold, the digital tube display module is controlled to display at the first brightness level; When the ambient light intensity is greater than or equal to the first threshold and less than the second threshold, the digital tube display module is controlled to display at a second brightness level that is higher than the first brightness level. When the ambient light intensity is greater than or equal to the second threshold, the digital tube display module is controlled to display at a third brightness level that is higher than the second brightness level.

4. The display control system based on human body sensing and light intensity detection according to claim 3, characterized in that: The brightness adjustment logic also includes: A third threshold is set, wherein the third threshold is less than the first threshold; When the ambient light intensity is less than the third threshold, the digital tube display module is controlled to display at a brightness lower than the upper limit of the first brightness level.

5. The display control system based on human body sensing and light intensity detection according to claim 1, characterized in that: The display control system includes a button touch module, which is electrically connected to the main control module.

6. The display control system based on human body sensing and light intensity detection according to claim 1, characterized in that: The main control module is configured as follows: When the display control system is in a non-working state and no user interaction is detected, it enters a low-power sleep mode and shuts down the power supply to the display driver module and at least one other peripheral module, while maintaining the function of receiving interrupt signals. The main control module is configured to exit the low-power sleep mode, start the display driver module, and restore the normal function of the device in response to a wake-up interrupt signal from the human body sensing module or a key interrupt signal from the user key touch module.

7. The display control system based on human body sensing and light intensity detection according to claim 5, characterized in that: The main control module includes a main control chip MCU1, a power board communication port CN1, resistors R22 and R23. One end of resistor R22 and one end of resistor R23 are electrically connected to pins 5 and 6 of the main control chip MCU1, respectively. The other ends of resistor R22 and R23 are electrically connected to pins 4 and 3 of the power board communication port CN1, respectively. The main control chip MCU1 is electrically connected to the power board communication port CN1 through resistors R22 and R23. The main control chip MCU1 is also electrically connected to a human body sensing module, a light intensity detection module, and a display driver module.

8. The display control system based on human body sensing and light intensity detection according to claim 7, characterized in that: The human body sensing module includes a microwave radar module CN2 and a signal processing circuit. The second pin of the microwave radar module CN2 is electrically connected to the signal processing circuit, and the signal processing circuit is electrically connected to the 16th pin of the main control chip MCU1. The microwave radar module CN2 is electrically connected to the 16th pin of the main control chip MCU1 through the signal processing circuit.

9. The display control system based on human body sensing and light intensity detection according to claim 7, characterized in that: The light intensity detection module includes a light sensor chip IC2B, resistors R5, R6, and R7. One end of resistor R5, one end of resistor R6, and one end of resistor R7 are electrically connected to pins 6, 5, and 4 of the light sensor chip IC2B, respectively. The other end of resistor R5 and the other end of resistor R7 are electrically connected to pins 14 and 13 of the main control chip MCU1, respectively.

10. A display control method based on human body sensing and light intensity detection, characterized in that: Includes the following steps: Step S1: Power on and initialize the system, and configure the parameters of each module; Step S2: Monitor the sensing signal output by the human body sensing module in real time; Step S3: When a valid sensing signal is detected, wake up the display system; Step S4: Read ambient light intensity data from the light intensity detection module in real time or periodically; Step S5: Determine the target brightness level based on the ambient light intensity data and according to the preset brightness adjustment logic; Step S6: Generate a control command containing the target brightness level and send it to the display driver module to drive the digital tube display module to display information according to the target brightness. Step S7: After the sensing signal disappears and continues for a predetermined delay time, the control display system is turned off.

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