Reflection type liquid crystal display system and intelligent dimming method

Abstract

The invention discloses a reflective liquid crystal display system and an intelligent dimming method. An ambient light sensor senses ambient light and generates a light intensity sensing signal; the intelligent control module judges environment light parameters according to light intensity sensing signals obtained by the environment light sensor and controls the front light supplementing light source to adjust the luminance according to the environment light parameters. Based on the characteristic that a reflective liquid crystal display panel reflects ambient light to realize a display function, and aiming at the situation that the display effect difference is large due to the influence of different time and weather when the liquid crystal display panel is used in an outdoor scene, a front light supplementing light source is intelligently regulated and controlled to ensure that the matching degree of screen brightness and ambient light is higher; the system is simple in structure and convenient to use, the unclear content caused by too dark or the dazzling vision caused by too bright is avoided, the watching comfort is improved, meanwhile, energy waste caused by front light supplementing transition is avoided, the standby power consumption of the equipment is remarkably reduced, and the energy-saving efficiency of the whole system is further improved.

Description

Technical Field

[0001] This invention relates to the field of reflective liquid crystal display technology, and more particularly to a reflective liquid crystal display system and an intelligent dimming method. Background Technology

[0002] Active matrix liquid crystal displays (AM-LCDs) using nematic liquid crystals are widely used in many applications. One application in paper-like displays is the cholesteric liquid crystal display (CLC). Cholesteric LCDs are characterized by bistable properties, high contrast, and high color accuracy. Cholesteric LCDs only require power to refresh the image when the screen changes, and can maintain the display even without applied voltage. These characteristics make cholesteric liquid crystals suitable for reflective displays. Therefore, reflective cholesteric LCDs offer excellent power-saving characteristics for static image display.

[0003] Because reflective displays rely on reflecting ambient light, their display quality is poor in low-light conditions or at night. Common solutions include: 1. Installing an external light source in front of the reflective display for illumination. 2. Adding LED lights in front of the reflective LCD panel for supplemental lighting. However, regardless of whether an external light source or internal LED lighting is used, the light source typically maintains a fixed brightness and remains constantly on, or requires manual control to turn it on and off. This significantly impacts energy consumption, especially in outdoor environments, making it impossible to achieve the low-energy goals of using reflective LCDs. Summary of the Invention

[0004] To address the technical problems existing in the background art, the present invention proposes a reflective liquid crystal display system, an intelligent dimming method, and an intelligent dimming device.

[0005] This invention proposes a reflective liquid crystal display system and an intelligent dimming method, comprising: Reflective liquid crystal display panel; Front fill light source; An ambient light sensor is used to sense ambient light and generate a light intensity sensing signal. The intelligent control module is used to determine the ambient light parameters based on the light intensity sensing signal obtained by the ambient light sensor, and to control the front supplementary light source to adjust the brightness according to the ambient light parameters.

[0006] Preferably, controlling the luminous intensity of the front supplementary light source according to ambient light parameters specifically includes: When the ambient light parameter I at time t t When I = ≥ 0, it is determined to be a bright light environment, and the operation of turning off the front supplementary light source is executed.

[0007] Preferably, when t n-1 Ambient light parameter I at any time tn-1 <I0 and t n Ambient light parameter I at any time tn If I > 0, start the continuous light timing. When the continuous light duration reaches δt1, it is determined that the environment has entered a bright light environment, and the operation of turning off the front supplementary light source is executed.

[0008] Preferably, controlling the luminous intensity of the front supplementary light source according to ambient light parameters specifically includes: When t n-1 Ambient light parameter I at any time tn-1 ≥I0 and t n Ambient light parameter I at any time tn When <I0, it is determined to be a dark environment. The operation of turning on the front supplementary light source is executed, and the dark light duration timer is started. When the duration of the dark light reaches δt2, the front supplementary light source is forcibly turned off.

[0009] Preferably, it further includes: a human body sensor, which is used to sense whether there is a person in front of the display panel and generate a human body sensing signal; The control module is used to control the front supplementary light source to adjust the brightness based on the human body sensing signal.

[0010] Preferably, when the front supplementary light source is turned on in a low-light environment, and the human body sensor detects a person in front of the display panel, the brightness level of the front supplementary light source is matched according to the preset light intensity threshold range to which the ambient light parameters belong.

[0011] Preferably, the brightness level of the front supplementary light source remains unchanged when the ambient light parameters change within a single threshold range.

[0012] Preferably, when the ambient light parameters change across different threshold ranges, the adjustment range of the brightness of the front supplementary light source is controlled according to the rate of change of the ambient light parameters.

[0013] Preferably, when the front supplementary light source is turned on in a low-light environment and the human body sensor does not detect anyone in front of the display panel, the brightness of the front supplementary light source is adjusted to the lowest brightness level.

[0014] In this invention, the proposed reflective liquid crystal display system senses ambient light through an ambient light sensor and generates a light intensity sensing signal. An intelligent control module determines ambient light parameters based on the light intensity sensing signal and controls the front supplementary light source to adjust its brightness accordingly. Based on the characteristic of reflective liquid crystal display panels to reflect ambient light for display, and considering the significant differences in display performance due to varying times and weather conditions in outdoor scenarios, the intelligent control of the front supplementary light source ensures a higher match between screen brightness and ambient light. This avoids excessive darkness causing unclear content or excessive brightness causing glare, improving viewing comfort. Simultaneously, it avoids energy waste caused by excessive front supplementary lighting, significantly reducing standby power consumption and further improving the overall system's energy efficiency.

[0015] The present invention also proposes an intelligent dimming method for the above-described reflective liquid crystal display system, comprising the following steps: An ambient light sensor detects ambient light and generates a light intensity sensing signal. The ambient light parameters are determined by the light intensity sensing signal obtained by the ambient light sensor, and the brightness of the front supplementary light source is adjusted according to the ambient light parameters.

[0016] Preferably, controlling the luminous intensity of the front supplementary light source according to ambient light parameters specifically includes: When t n-1 Ambient light parameter I at any time tn-1 <I0 and t n Ambient light parameter I at any time tn If I0 is ≥, start the continuous light timer. When the continuous light duration reaches δt1, it is determined that the environment has been entered and the front supplementary light source is turned off. And / or, when t n-1 Ambient light parameter I at any time tn-1 ≥I0 and t n Ambient light parameter I at any time tn When <I0, it is determined to be a dark environment. The operation of turning on the front supplementary light source is executed, and the dark light duration timer is started. When the duration of the dark light reaches δt2, the front supplementary light source is forcibly turned off.

[0017] Preferably, the method further includes the following steps: a human body sensor detects whether there is a person in front of the display panel and generates a human body sensing signal; the control module controls the front supplementary light source to adjust the brightness of the light emission according to the human body sensing signal.

[0018] The intelligent dimming method proposed in this invention has similar technical effects to the aforementioned reflective liquid crystal display system, and will not be described in detail here. Attached Figure Description

[0019] Figure 1This is a schematic diagram showing the supplementary light source setup for one embodiment of a reflective liquid crystal display system proposed in this invention.

[0020] Figure 2 This is a schematic diagram of one embodiment of a reflective liquid crystal display system proposed in this invention.

[0021] Figure 3 This is a flowchart illustrating one implementation of the intelligent dimming method proposed in this invention. Detailed Implementation

[0022] Reference Figure 1 and 2 The present invention proposes a reflective liquid crystal display system, comprising: The reflective liquid crystal display panel 1 may be a cholesteric liquid crystal display panel; In actual design, the front supplementary light source 2 can be externally set in front of the reflective display screen for illumination, or LED lights can be added in front of the display panel module for supplementary lighting, or a light guide plate can be added in front of the display panel module, and LED lights set at the end of the light guide plate can be used for light compensation. Ambient light sensor 3 is used to sense ambient light and generate a light intensity sensing signal. Ambient light sensors include, but are not limited to, photodiodes, phototransistors, CCD sensors, CMOS sensors, ultraviolet sensors, infrared sensors, color sensors, and a range of other light-related sensors. The ambient light intensity it detects includes, but is not limited to, 150 lx. The intelligent control module is used to determine the ambient light parameters based on the light intensity sensing signal obtained by the ambient light sensor 3, and to control the front supplementary light source 2 to adjust the brightness of the light emission based on the ambient light parameters.

[0023] In the specific control method, controlling the luminous intensity of the front supplementary light source 2 according to the ambient light parameters specifically includes: when the ambient light parameter I at time t... t When ≥I0, it is determined to be a bright lighting environment, and the operation of turning off the front supplementary light source 2 is executed. Further, when t n-1 Ambient light parameter I at any time tn-1 <I0 and t n Ambient light parameter I at any time tn When the ambient light parameter is greater than I0, a continuous light timer is initiated. If the duration of continuous light reaches δt1, the system is considered to have entered a bright light environment and the front supplementary light source 2 is shut down. When the system is in a dark light state, if the ambient light parameter is greater than I0 at time t, it is considered to be in a bright light environment. The front supplementary light source 2 is shut down, and a continuous light timer is initiated. If the duration of continuous light reaches δt1, the system is considered to have exited the dark light state. At this point, the system can enter sleep mode.

[0024] Correspondingly, when the ambient light parameter I at time t t When the value is less than I0, it is determined to be a low-light environment, and the operation of turning on the front supplementary light source 2 is executed. Further, when t... n-1 Ambient light parameter I at any time tn-1 ≥I0 and t n Ambient light parameter I at any time tn When the ambient light parameter is less than I0, the system is considered to be in a low-light environment. The system activates the front supplementary light source 2 and starts a timer for continuous low-light operation. When the duration of continuous low-light operation reaches δt2, the front supplementary light source 2 is forcibly shut off. When the system is in bright light, if the ambient light parameter is less than I0 at time t, it is considered to be in a low-light environment. The front supplementary light source 2 is activated, and a timer for forced shutdown is started. After δt2, the light source is forcibly shut off. This module, which uses a timer to force shutdown during low-light conditions, precisely reduces ineffective power consumption during the early morning hours when no one is present. It automatically shuts off the front light source after the environment has been continuously in low light for a cumulative duration of δt2. This precisely covers periods with a high probability of no human activity, such as early morning and extreme rainy days. It avoids the "waste power" problem that may occur in traditional solutions due to sensor misjudgment or algorithm delays. It eliminates energy waste during long periods of no human presence in low-light environments from a time perspective, significantly reducing standby power consumption during inactive periods and further improving overall energy efficiency.

[0025] In another specific embodiment, the reflective liquid crystal display system of this embodiment further includes: a human body sensor 4, which is used to sense whether there is a person in front of the display panel 1 and generate a human body sensing signal; the control module is used to control the front supplementary light source 2 to adjust the brightness of the light emission according to the human body sensing signal. For example, the human body sensor adopts millimeter-wave radar, and the detection range is set to 2m.

[0026] When the front supplementary light source 2 is turned on in a low-light environment, the control module can adjust the brightness of the front supplementary light source 2 based on the human body sensing signal through an intelligent dimming strategy, thereby balancing display effect and energy efficiency. In a low-light environment, when the human body sensor 4 detects someone in front of the display panel 1, it activates an intelligent algorithm to implement a graded dimming strategy. Specifically, when the human body sensor 4 detects someone in front of the display panel 1, it matches the brightness level of the front supplementary light source 2 according to the preset light intensity threshold range of the ambient light parameters. In actual design, multiple light intensity threshold ranges are preset, and a corresponding brightness level is matched to each threshold range. For example, when the threshold range is 250lx≤lux≤300lx, the brightness level is set to 8% Max; when the threshold range is 200lx≤lux<250lx, the brightness level is set to 16% Max; when the threshold range is 150lx≤lux<200lx, the brightness level is set to 24% Max; when the threshold range is 100lx≤lux<150lx, the brightness level is set to 32% Max; when the threshold range is 50lx≤lux<100lx, the brightness level is set to 40% Max; and when the threshold range is 0lx≤lux<50lx, the brightness level is set to 48% Max.

[0027] When the ambient light parameters change within a single threshold range, the brightness level of the front supplementary light source 2 remains unchanged. When the ambient light parameters change across different threshold ranges, the algorithm controls the adjustment range of the brightness of the front supplementary light source 2 according to the rate of change of the ambient light parameters. If a change across ranges is detected, the algorithm immediately rematches the corresponding brightness level; if the light intensity fluctuates within the same range, the algorithm maintains the current brightness output to avoid brightness flickering caused by frequent adjustments.

[0028] The dimming process is divided into multiple levels, employing different dimming speeds and amplitudes based on the severity of environmental changes. When ambient light or human activity changes minimally, a slow and precise dimming method is used to save energy and ensure stable display performance. When ambient light suddenly brightens or someone rapidly approaches the display, a fast dimming level is triggered, quickly adjusting the screen brightness to an appropriate level to meet immediate visual needs. This tiered dimming strategy ensures energy efficiency and stable display most of the time, while also enabling rapid response during sudden environmental changes.

[0029] When the front supplementary light source 2 is turned on in a low-light environment, and the human body sensor 4 does not detect anyone in front of the display panel 1, the brightness of the front supplementary light source is adjusted to the lowest brightness level, thereby reducing the system's energy consumption.

[0030] Reference Figure 3In one specific control logic, the ambient light sensor first collects the ambient light intensity sensing signal. The intelligent control unit then determines whether the ambient light parameter is greater than a preset ambient light threshold I0 based on the light intensity sensing signal. If the ambient light parameter is greater than the ambient light threshold I0, the supplementary lighting source is turned off. If the ambient light parameter is less than the ambient light threshold I0, the system detects whether there is human activity in front of the display panel. If there is human activity, an intelligent hierarchical dimming algorithm is activated, dynamically adjusting the brightness based on the real-time detection results of the ambient light sensor. If there is no human activity, the brightness of the front light is modulated to the lowest level.

[0031] In this embodiment, the proposed reflective liquid crystal display system and intelligent dimming method sense ambient light and generate a light intensity sensing signal through an ambient light sensor. The intelligent control module determines the ambient light parameters based on the light intensity sensing signal obtained by the ambient light sensor and controls the front supplementary light source to adjust the brightness according to the ambient light parameters. Based on the characteristic of the reflective liquid crystal display panel to reflect ambient light to achieve display function, and considering the significant differences in display effect due to different times and weather conditions when used in outdoor scenarios, intelligent control of the front supplementary light source ensures a higher match between screen brightness and ambient light, avoiding the problem of unclear content due to excessive darkness or visual glare due to excessive brightness, thus improving viewing comfort. At the same time, it avoids energy waste caused by excessive front supplementary light, significantly reducing the standby power consumption of the device and further improving the energy efficiency of the entire system.

[0032] The following detailed embodiments illustrate the specific working method of the reflective liquid crystal display system used as an outdoor billboard.

[0033] An ambient light sensor is installed under the glass of the advertising machine using a reflective LCD display system to detect the intensity of natural light. A human body sensor is then installed, capable of detecting moving organisms. The sensor detects the body shape of moving organisms to detect whether someone is passing by. An intelligent control board inside the machine automatically adjusts the intensity of the front light through algorithms when dim ambient light is detected due to overcast skies, rain, or fog, and someone is passing by. It compensates for scattered and attenuated light to ensure accurate perception of the true intensity of ambient light, thereby precisely adjusting the brightness of the reflective screen.

[0034] Bright light environment determination: When the ambient light sensor detects a light intensity >300lx, it is determined to be a bright light environment, and the front light is turned off; if the system was previously in a dark light state, the bright light duration timing module is started. When the duration of continuous bright light reaches 30 minutes, it is determined to have left the dark light state, and the relevant timing parameters for dark light are reset.

[0035] Low-light environment determination: When the ambient light sensor detects a light intensity of <290lx, it is determined to be a low-light environment, enters the low-light state, and starts the 6-hour forced light-off timer module; if the system switches from a non-low-light state to a low-light state, the low-light start time is recorded again.

[0036] In low-light environments or rainy / foggy weather, when millimeter-wave radar detects human activity, it intelligently controls the brightness of the light source in front of the person based on a real-time light intensity algorithm.

[0037] The intelligent algorithm employs a tiered dimming strategy: dividing the dimming process into multiple levels, using different dimming speeds and amplitudes based on the drastic changes in the environment. When ambient light or human activity changes little, a slow and precise dimming method is used to save energy and ensure stable display effects. When ambient light suddenly brightens or someone quickly approaches the advertising display, a fast dimming level is triggered, rapidly adjusting the screen brightness to an appropriate level to meet immediate visual needs. Through this tiered dimming strategy, energy saving and stable display are ensured most of the time, while also enabling rapid response during sudden environmental changes. Beneficial effects: Intelligent control of front light intensity, rapid response to changing environments, ensuring the screen brightness remains at an appropriate level, and energy saving and environmental protection.

[0038] Intelligent graded dimming algorithm trigger condition judgment: When the ambient light sensor detects light intensity ≤300lx (dark light environment) and the millimeter-wave radar detects human activity, the intelligent graded dimming algorithm is activated; if the millimeter-wave radar does not detect human activity or the light intensity is in other ranges (≥300lx), the algorithm is not activated, and the corresponding basic control logic is executed (2% Max brightness or front light off or maintain the current state).

[0039] Illumination intensity range division and brightness mapping: The intelligent hierarchical dimming algorithm divides the illumination intensity in low-light environments into 6 continuous ranges and presets a unique corresponding front light brightness for each range (expressed as a percentage of PWM duty cycle, based on the Max brightness). The specific mapping relationship is as follows: When the light intensity is between 250lx ≤ lux ≤ 300lx, the algorithm outputs a PWM duty cycle of 8% and controls the maximum brightness of the light source to 8%. When the light intensity is between 200lx ≤ lux < 250lx, the algorithm outputs a PWM duty cycle of 16% to control the maximum brightness of the light source at 16%. When the light intensity is between 150lx ≤ lux < 200lx, the algorithm outputs a PWM duty cycle of 24% to control the maximum brightness of the light source at 24%. When the light intensity is between 100lx ≤ lux < 150lx, the algorithm outputs a PWM duty cycle of 32% to control the maximum brightness of the light source at 32%. When the light intensity is between 50lx ≤ lux < 100lx, the algorithm outputs a PWM duty cycle of 40% to control the maximum brightness of the light source at 40%. When the light intensity is 0lx≤lux<50lx, the algorithm outputs a PWM duty cycle of 48% and controls the maximum light brightness of 48%.

[0040] Dynamic adjustment logic of the algorithm: The intelligent graded dimming algorithm acquires real-time data from the ambient light sensor at a 1Hz cycle (synchronized with the system control task cycle). If a change in light intensity across intervals is detected, the algorithm immediately rematches the corresponding brightness level and updates the PWM duty cycle. If the light intensity fluctuates within the same interval, the algorithm maintains the current brightness output to avoid brightness flickering caused by frequent adjustments.

[0041] The intelligent hierarchical dimming algorithm terminates when any of the following conditions are met: The ambient light sensor detected a light intensity ≥300lx (switching to a bright light environment); Millimeter-wave radar detected a change in the human activity status from "present" to "absent"; The dim lighting environment lasts for 6 hours (triggering the 6-hour forced lights-off mechanism).

[0042] Core formula of the algorithm: 1. Algorithm Triggering Condition Formula set up: L = Real-time light intensity detected by the ambient light sensor (unit: lx) P = Millimeter-wave radar human detection result (Boolean value, 1 = human body detected, 0 = not detected) S = Algorithm startup state (Boolean value, 1 = Started, 0 = Not started) The triggering condition formula is: S = 1 if and only if (L ≤ 290.0 lx) ∧ (P = 1) S = 0 if and only if (P = 0) ∨ (L ≥ 300 lx) 2. Brightness mapping (PWM duty cycle) formula Let D = the PWM duty cycle output by the algorithm (unit: % Max brightness), then: if 250 ≤ L ≤ 300 → D = 8 elif 200 ≤ L<250 → D = 16 elif 150 ≤ L<200 → D = 24 elif 100 ≤ L<150 → D = 32 elif 50 ≤ L<100 → D = 40 elif 0 ≤ L<50 → D = 48 3. Algorithm Termination Condition Formula set up: T = Duration of the dark environment (L ≤ 290.0 lx) (in hours) E = Algorithm termination status (Boolean value, 1 = terminated, 0 = continue running) The termination condition formula is: E = 1 if and only if (L ≥ 300 lx) ∨ (P changes from 1 to 0) ∨ (T ≥ 6 h) E = 0 if and only if (L ≤ 290.0 lx) ∧ (P = 1) ∧ (T<6 h).

[0043] Compared to traditional fixed brightness control schemes, the intelligent hierarchical dimming algorithm of this invention has the following advantages: Brightness adaptive accuracy: Through 6 levels of subdivided illumination range, linear matching of "illuminance-brightness" is achieved, avoiding the problems of "overly bright waste" or "underly dark insufficient" caused by a single brightness level; Energy consumption optimization: Based on real-time dynamic brightness adjustment, compared with a fixed high brightness solution, energy consumption can be reduced by ≥30% in low-light environments with human activity. Compatibility: The algorithm output directly interfaces with the PWM control module without requiring additional hardware modifications, and is compatible with the existing hardware architecture of intelligent front light control systems.

[0044] The beneficial effects of the reflective display system in this embodiment are: 1. Precisely Reduce Power Consumption for High-Efficiency Energy Saving: Through the refined control of an intelligent hierarchical dimming algorithm, in low-light environments (light intensity ≤290lx) with human activity, the front light brightness is dynamically matched according to 6 levels of subdivided lighting intervals (8%~48% Max brightness), avoiding the "over-brightness waste" problem of traditional fixed brightness solutions. Compared to a fixed high brightness mode, energy consumption is reduced by ≥30% in low-light scenarios with human activity; at the same time, the front light is automatically turned off in bright environments (≥300lx), and only maintains 2% Max brightness or is turned off when no one is active, further reducing ineffective energy consumption and significantly improving energy utilization efficiency.

[0045] 2. A 6-hour forced-off timer module, activated in low-light environments, precisely reduces ineffective power consumption during unattended periods in the early morning. This module automatically shuts off the front light after 6 hours of continuous low-light conditions (light intensity <290lx). This mechanism accurately covers periods of high probability of no human activity, such as the early morning, avoiding the "waste power" problem caused by sensor misjudgments or algorithm delays in traditional solutions. It eliminates energy waste during prolonged periods of no human presence in low-light environments from a time perspective, significantly reducing standby power consumption during inactive periods and further improving overall energy efficiency.

[0046] 3. Optimize visual experience and ensure a smooth viewing experience. Precise brightness adaptation: Through a linear mapping of "light intensity - brightness" (e.g., 250~300lx corresponds to 8% brightness, 0~50lx corresponds to 48% brightness), the screen brightness is more closely matched with the ambient light, avoiding the problem of the content being too dark to see clearly or the visual glare caused by the brightness being too bright, thus improving viewing comfort.

[0047] Dynamic adjustment stability: Maintains constant brightness within the same lighting range and responds immediately when crossing ranges. Combined with a graded dimming strategy (slow fine-tuning when the environment changes slightly and rapid response when there is a sudden change), it avoids brightness flicker caused by frequent dimming and can quickly adapt to the optimal brightness when the environment changes suddenly (such as when a person approaches quickly or the lighting changes abruptly), ensuring the continuity and immediacy of the visual experience.

[0048] Enhanced scene adaptability: Even in special low-light environments such as rain and fog, the screen can still intelligently adjust the brightness based on human activity detection to ensure that the screen content is clearly visible in different scenarios, meeting the user's visual needs in changing environments.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A reflective liquid crystal display system, characterized in that, include: Reflective liquid crystal display panel (1); A front-mounted supplementary light source (2) is used to provide supplementary light on the incident light side of the reflective liquid crystal display panel (1); Ambient light sensor (3) is used to sense ambient light and generate light intensity sensing signals; The intelligent control module is used to determine the ambient light parameters based on the light intensity sensing signal obtained by the ambient light sensor (3), and to control the front supplementary light source (2) to adjust the luminous brightness based on the ambient light parameters. The control of the luminous intensity of the front supplementary light source (2) based on ambient light parameters specifically includes: When t n-1 Ambient light parameter I at any time tn-1 <I0 and t n Ambient light parameter I at any time tn ≥I0, start the continuous light timer. When the continuous light duration reaches δt1, it is determined that the environment has been entered and the operation of turning off the front supplementary light source (2) is executed. And / or, when t n-1 Ambient light parameter I at any time tn-1 ≥I0 and t n Ambient light parameter I at any time tn When <I0, it is determined to be a dark environment. The operation of turning on the front supplementary light source (2) is executed, and the dark light duration timer is started. When the duration of the dark light reaches δt2, the front supplementary light source (2) is forcibly turned off.

2. The reflective liquid crystal display system according to claim 1, characterized in that, Also includes: Human body sensor (4) is used to sense whether there is a person in front of the display panel (1) and generate a human body sensing signal; The control module is used to control the front supplementary light source (2) to adjust the brightness of the light emission based on the human body sensing signal.

3. The reflective liquid crystal display system according to claim 2, characterized in that, When the front supplementary light source (2) is turned on in a low-light environment, when the human body sensor (4) senses that there is someone in front of the display panel (1), it matches the brightness level corresponding to the front supplementary light source (2) according to the preset light intensity threshold range of the ambient light parameters.

4. The reflective liquid crystal display system according to claim 3, characterized in that, When the ambient light parameters change within a single threshold range, the brightness level of the front supplementary light source (2) remains unchanged.

5. The reflective liquid crystal display system according to claim 3, characterized in that, When the ambient light parameters change across different threshold ranges, the brightness of the front supplementary light source (2) is adjusted according to the rate of change of the ambient light parameters.

6. The reflective liquid crystal display system according to claim 2, characterized in that, When the front supplementary light source (2) is turned on in a low-light environment, and the human body sensor (4) does not detect anyone in front of the display panel (1), the brightness of the front supplementary light source is adjusted to the lowest brightness level.

7. A smart dimming method for a reflective liquid crystal display system according to any one of claims 1-6, characterized in that, Includes the following steps: The ambient light sensor (3) senses ambient light and generates a light intensity sensing signal; The ambient light parameters are determined based on the light intensity sensing signal obtained by the ambient light sensor (3), and the brightness of the front supplementary light source (2) is adjusted according to the ambient light parameters.

8. The intelligent dimming method according to claim 7, characterized in that, The control of the luminous intensity of the front supplementary light source (2) based on ambient light parameters specifically includes: When t n-1 Ambient light parameter I at any time tn-1 <I0 and t n Ambient light parameter I at any time tn ≥I0, start the continuous light timer. When the continuous light duration reaches δt1, it is determined that the environment has been entered and the operation of turning off the front supplementary light source (2) is executed. And / or, when t n-1 Ambient light parameter I at any time tn-1 ≥I0 and t n Ambient light parameter I at any time tn When <I0, it is determined to be a dark environment. The operation of turning on the front supplementary light source (2) is executed, and the dark light duration timer is started. When the duration of the dark light reaches δt2, the front supplementary light source (2) is forcibly turned off.

9. The intelligent dimming method according to claim 7, characterized in that, It also includes the following steps: the human body sensor (4) senses whether there is a person in front of the display panel (1) and generates a human body sensing signal; the control module controls the front supplementary light source (2) to adjust the brightness of the light according to the human body sensing signal.

Images