A method and system for dynamic dimming of LED backlight

Abstract

This invention discloses a dynamic dimming method and system for LED backlights, belonging to the field of backlight control technology. This invention employs local dimming, dividing the screen into multiple backlight areas. Based on changes in the external environment and the average fatigue level of the effective users, and combined with four aspects—color temperature, brightness, brightness contrast, and brightness uniformity of the LED backlight—the backlight areas are adjusted, effectively improving the user's visual comfort.

Description

Technical Field

[0001] This invention belongs to the field of backlight control technology, specifically relating to a dynamic dimming method and system for LED backlights. Background Technology

[0002] Currently, LED-backlit displays, such as computers, televisions, and LED commercial screens, are widely used in our daily lives. However, users often experience eye dryness, stinging, and fatigue, affecting visual comfort. A key factor influencing user visual comfort is the LED backlight dimming method. Existing technology, patent number CN119694268A, describes a MiniLED backlight brightness control system for display devices. This patent improves user visual comfort by constructing a human eye adaptation model and using MPC to globally control the LED backlight brightness. However, global dimming can easily lead to insufficient contrast between bright and dark areas, exacerbating user eye fatigue. Furthermore, adjusting brightness individually has limited impact on improving user visual comfort. Therefore, to better enhance the user's visual experience, a new dynamic dimming method and system for LED backlights is urgently needed. Summary of the Invention

[0003] To address the aforementioned problems in the prior art, this invention provides a dynamic dimming method and system for LED backlights.

[0004] The objective of this invention can be achieved through the following technical solutions:

[0005] The first aspect of the present invention provides a dynamic dimming method for an LED backlight, comprising the following steps:

[0006] S1: The backlight area is divided into several zones along the horizontal and vertical directions using 2D dimming in the local dimming method;

[0007] S2: Acquire the frame sequence of the image displayed on the LED screen, extract the brightness values ​​of each partition in the image frame sequence, and the RGB data of the image; and collect external environmental data and effective user eye condition data; the effective user refers to a user whose gaze time is greater than 10 minutes;

[0008] S3: Perform data correspondence pattern judgment and effective user eye fatigue level judgment;

[0009] S4: Adjust the color temperature based on the ambient color temperature and the average fatigue level of the effective users;

[0010] S5: Adjust the brightness level, brightness contrast, and brightness uniformity sequentially based on the average fatigue level of effective users.

[0011] Furthermore, the external environment data includes: time data, ambient brightness data, and ambient color temperature data; the effective user eye condition data includes: blink frequency, pupil size, fixation time, and number of effective users.

[0012] Furthermore, the data corresponding mode interpretation specifically includes: determining whether it is daytime or nighttime based on time data; determining whether it is a low-light environment or a high-light environment based on ambient brightness; and determining whether the current environment is a cool color temperature environment or a warm color temperature environment based on ambient color temperature value data.

[0013] Furthermore, the determination of the effective user's eye fatigue level specifically includes:

[0014] Define the parameter ranges for blink frequency, pupil diameter, and fixation time corresponding to different levels of fatigue;

[0015] Logical judgment of effective user fatigue level based on parameter range, including:

[0016] Low fatigue: Any two parameters are in the low fatigue range; Medium fatigue: Any two parameters are in the medium fatigue range; High fatigue: Any two parameters are in the high fatigue range.

[0017] Furthermore, there can be multiple valid users; the average fatigue level is calculated as follows: extract the fatigue level of each valid user, low fatigue corresponds to fatigue level 1, medium fatigue corresponds to fatigue level 2, and high fatigue corresponds to fatigue level 3. Calculate the average fatigue level using the mean method, and round the average fatigue level to obtain the final average fatigue level of the valid users.

[0018] Furthermore, the specific steps for adjusting the color temperature include:

[0019] S41: Determine if the current mode is day / night; determine if the external environment is warm / cool color temperature; retrieve the average fatigue level of active users;

[0020] S42: When the external environment is warm color temperature, under the main tone of day / night mode, the LED backlight color temperature is increased accordingly based on the average fatigue level of effective users.

[0021] S43: When the external environment is cool color temperature, under the main theme of day / night mode, the LED backlight color temperature is reduced according to the average fatigue level of effective users.

[0022] Furthermore, the specific steps for adjusting the brightness level include:

[0023] S511: Obtain the ambient light level and average fatigue level of active users;

[0024] S512: The external environment is dark. The brightness of the entire area is reduced based on the degree of darkness and the average fatigue level of the effective users.

[0025] S513: The external environment is a bright environment. The brightness of the entire area is increased based on the brightness of the environment and the average fatigue level of the effective users.

[0026] A second aspect of the present invention provides an LED backlight dynamic dimming system, applied to an LED backlight dynamic dimming method as described above, comprising: a data acquisition module, a data processing and judgment module, a color temperature adjustment module, and a brightness adjustment module;

[0027] Data acquisition module: used to divide the backlight area and acquire the brightness data and RGB data of the image; use a color temperature sensor to acquire the RGB data of the environment, use a photoresistor to acquire the brightness data of the outside world, and use an infrared camera and gyroscope to acquire the blink count, pupil diameter and fixation time data of the effective user's eyes.

[0028] Data processing and judgment module: Determines whether it is day or night based on time data; determines whether it is a dark or bright environment based on ambient brightness data; determines whether the current color temperature is a warm or cool color temperature environment based on ambient color temperature data; and judges and calculates the average fatigue level of effective users based on blink count, pupil diameter, fixation time, and number of effective users.

[0029] Color temperature adjustment module: Adjusts the color temperature based on the ambient color temperature and the fatigue level of the user.

[0030] Brightness adjustment module: Adjusts brightness level, brightness contrast and brightness uniformity sequentially based on the average fatigue level of effective users.

[0031] The beneficial effects of this invention are as follows:

[0032] This invention effectively assesses the average fatigue level of effective users by using effective user eye condition data and fatigue level judgment logic, which provides important reference data for the regional control of LED backlights;

[0033] This invention adaptively adjusts the color temperature tone of the LED backlight based on external environmental conditions and the average fatigue level of effective users, effectively improving the visual comfort of users.

[0034] This invention improves user visual comfort by adaptively adjusting the brightness, contrast, and uniformity of the LED backlight based on external environmental conditions and the average fatigue level of effective users. Attached Figure Description

[0035] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0036] Figure 1 This is a flowchart illustrating a dynamic dimming method for an LED backlight provided in an embodiment of the present invention.

[0037] Figure 2 A schematic diagram illustrating the process of adjusting the brightness of an LED backlight according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram illustrating the steps of adjusting the brightness and contrast of an LED backlight according to an embodiment of the present invention.

[0039] Figure 4 This is a schematic diagram illustrating the steps of adjusting the brightness uniformity of an LED backlight according to an embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram of a dynamic dimming structure for an LED backlight provided in an embodiment of the present invention. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0043] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0044] Specifically, the following content provides a detailed description of the LED backlight dynamic dimming method and system of the present invention:

[0045] Example 1

[0046] See Figure 1 This embodiment provides a method for dynamic dimming of LED backlight.

[0047] A method for dynamic dimming of an LED backlight, comprising the following steps:

[0048] S1: Using 2D dimming in local dimming, the backlight area is divided into several zones along the horizontal and vertical directions.

[0049] LED backlight dimming mainly includes: global dimming and local dimming; global dimming refers to treating the backlight emitted by the backlight as a whole and controlling it uniformly. This method is simple to control but the effect is generally not good.

[0050] Local dimming refers to dividing the backlight area into multiple zones and controlling the backlight of each zone individually. The division method is divided into 1D and 2D. 1D dimming refers to dividing the backlight area into multiple zones in the horizontal or vertical direction, while 2D dimming refers to dividing the backlight area into multiple zones in both the horizontal and vertical directions. The number of zones is determined by the type and size of the LED screen.

[0051] After dividing the area into several regions in step S1, adjustments can be made to different regions based on the average fatigue level of effective users, combined with color temperature, brightness, brightness contrast, and brightness uniformity, thereby improving user visual comfort.

[0052] S2: Acquire the frame sequence of the image displayed on the LED screen, extract the brightness values ​​of each partition in the image frame sequence, and the RGB data of the image; and collect external environmental data and effective user eye condition data.

[0053] The brightness data of each zone mentioned above is only the basic brightness data obtained based on the image display content. Different bright and dark areas in the image will have different corresponding brightness. The brightness at this time does not take into account factors such as the external environment and the visual fatigue of the effective users. The general method is to adjust the overall brightness of the LED display screen according to the brightness of the external environment.

[0054] Specifically, the collected environmental data includes: time data, ambient brightness data, and ambient color temperature data;

[0055] Users' visual needs differ between day and night. To better improve users' visual comfort, it is necessary to distinguish between day and night when users use the device, and the collected time data is used to determine whether the user is using the device during the day or night.

[0056] Ambient brightness and color temperature not only affect image display quality but also user eye fatigue. To better adapt to different environments and improve user experience, it is necessary to collect ambient brightness data to determine whether the user's current external environment is a low-light or high-light environment; and to collect ambient color temperature data to determine whether the user's current external environment is a warm or cool color temperature environment.

[0057] Specifically, the collected user eye condition data includes: blink frequency, pupil size, fixation time, and number of valid users;

[0058] There may be one or more users viewing the screen; blink frequency refers to the number of times a single user blinks per minute; pupil size refers to the diameter of a single user's pupil; fixation time refers to the time a single user focuses on the screen; effective user count refers to users whose fixation time is greater than 10 minutes.

[0059] Users who stare at the screen for more than 10 minutes are considered valid users; the eye fatigue level of each valid user is determined based on their eye condition data; the eye fatigue level is divided into three levels: low, medium, and high.

[0060] S3: Data correspondence pattern judgment and effective user eye fatigue level judgment;

[0061] Data correspondence pattern judgment:

[0062] Determine whether it is day or night based on time data; determine whether it is a dark or bright environment based on ambient brightness data;

[0063] Determine whether the current color temperature environment is warm or cool based on the ambient color temperature data;

[0064] Specifically: The device uses the current Beijing time to determine whether the external environment is day or night in real time: Daytime: 6:00-18:00; Nighttime: 18:00-6:00 the next day; It uses a color temperature sensor to determine whether the external environment is warm or cool: Warm color temperature environment: color temperature value <4000K; Cool color temperature environment: color temperature value ≥4000K; It uses a photoresistor to monitor the brightness of the external environment in real time to determine whether it is dark or bright: Dark environment: 0-1200 lux; Bright environment: >1200 lux.

[0065] Processing of valid user eye condition data:

[0066] Blinking frequency fatigue level: Low fatigue: more than 12 times / minute; Moderate fatigue: 8-11 times / minute; Less than 7 times / minute;

[0067] Pupil diameter: Low fatigue: 2.5-3mm; Medium fatigue: 3.1-3.5mm or less than 2.5mm; High fatigue: greater than 3.5mm or less than 2mm;

[0068] Fixation time: Low fatigue: 10-30 min; Moderate fatigue: 30-60 min; High fatigue: more than 60 min;

[0069] Logic for determining effective user fatigue level:

[0070] Low fatigue: Any two parameters are within the normal range; Medium fatigue: Any two parameters are within the medium fatigue range; High fatigue: Any two parameters are within the high fatigue range.

[0071] When there are multiple valid users, extract the fatigue level of each valid user. Low fatigue corresponds to fatigue level 1, medium fatigue corresponds to fatigue level 2, and high fatigue corresponds to fatigue level 3. Calculate the average fatigue level and round it to the nearest integer.

[0072] The blink frequency, pupil diameter, and fixation time of one or more effective users are collected using an infrared camera and gyroscope. Based on the number of blinks, pupil size, and fixation time, each effective user is classified into visual fatigue levels (low, medium, and high). The average visual fatigue level is calculated for multiple effective users. Then, the color temperature, brightness, brightness contrast, and brightness uniformity are adjusted based on the average fatigue level of the effective users.

[0073] S4: Adjust the color temperature based on the ambient color temperature and the user's fatigue level;

[0074] Color temperature is divided into high color temperature (cool white light) and low color temperature (warm yellow light). At high color temperature, the screen is rich in blue light, which will inhibit the secretion of melatonin. The advantage is high visual clarity, but it will affect sleep quality. It is suitable for daytime.

[0075] At low color temperature: the screen has a low blue light ratio. Advantages: less impact on circadian rhythm, but it will reduce visual clarity, making it suitable for nighttime.

[0076] Preferably, the screen color temperature is divided into daytime mode and nighttime mode. The daytime mode is based on a high color temperature cool white light, while the nighttime mode is based on a low color temperature warm yellow light. The screen automatically activates the daytime or nighttime mode based on the daytime or nighttime result determined by the time data.

[0077] In a warm color temperature environment, appropriately increasing the LED backlight color temperature can improve the display effect; in a cool color temperature environment, appropriately decreasing the LED backlight color temperature can alleviate fatigue.

[0078] Preferably, the external color temperature environment is determined based on ambient color temperature data, and the color temperature is further adjusted in combination with the effective user's visual fatigue level;

[0079] Specifically, the steps for adjusting the color temperature are as follows:

[0080] S41: Determine if the current mode is day / night; determine if the external environment is warm / cool color temperature; retrieve the average fatigue level of active users;

[0081] S42: When the external environment is warm color temperature, under the main tone of day / night mode, the LED backlight color temperature is increased accordingly based on the average fatigue level of effective users.

[0082] S43: When the external environment is cool color temperature, under the main theme of day / night mode, the LED backlight color temperature value is reduced accordingly based on the average fatigue level of effective users.

[0083] For example: On a display screen, the current time is 14:00, the screen color temperature is adjusted to a daytime mode with cool white light as the main tone (reference color temperature is 6500K), the average fatigue level of the effective users is moderate fatigue, the color temperature adjustment range is 400K, and the current environment is detected to be a warm color temperature environment, then the LED backlight color temperature adjustment is 6500K + 400K = 6900K;

[0084] Color temperature can be controlled by adjusting the RGB channels or the ratio of warm and cool white light.

[0085] S5: Adjust the brightness, contrast, and uniformity sequentially based on the average fatigue level of effective users;

[0086] S51: Brightness adjustment:

[0087] High brightness in dark environments can cause the pupils to constrict continuously and the ciliary muscles to tense, leading to dry eyes. Brightness should be reduced to improve the user's visual comfort. In bright environments, insufficient brightness forces the eyes to increase their accommodation effort, increasing fatigue.

[0088] See Figure 2 The specific steps for adjusting the brightness include:

[0089] S511: Obtain the ambient light level and average fatigue level of active users;

[0090] S512: The external environment is dark. The brightness of the entire area is reduced based on the degree of darkness and the average fatigue level of the effective users.

[0091] S513: The external environment is a bright environment. The brightness of the entire area is increased based on the brightness of the environment and the average fatigue level of the effective users.

[0092] Dark environments are specifically divided into deep dark environments (0-600 lux) and light dark environments (600-1200 lux); bright environments are specifically divided into light bright environments (1200-1800 lux) and deep bright environments (>1800 lux).

[0093] When the environment is dark or bright, the dimming level needs to be weighted based on the average fatigue level of the effective users to further deepen the dimming level; avoid dimming only after the effective users have become more fatigued due to a sudden change in ambient light for a period of time, and make corresponding responses to drastic changes in the environment.

[0094] For example: if the ambient light is detected to be dark and the average fatigue level of the effective users is medium fatigue, the weights of low, medium, high, and high + dark fatigue in dark environments are 0.85, 0.75, 0.65, and 0.55, respectively. In a dark environment, medium fatigue needs to be further weighted to increase the dimming level to become high fatigue level. At this time, the weight is 0.65, and the brightness is reduced to 0.65 times the original brightness.

[0095] After adjusting the screen brightness in step S51 based on the brightness of the external environment and the average fatigue level of the effective users, the overall screen brightness has alleviated the visual fatigue of the effective users to a certain extent. In order to further improve the visual comfort of users, the brightness is further adjusted based on the contrast ratio on the basis of the current screen brightness.

[0096] S52: Brightness and contrast adjustment:

[0097] Contrast can affect the sense of depth and the ability to distinguish details in an image. Excessive contrast can cause the pupils to dilate and constrict frequently, which can accelerate visual fatigue.

[0098] After adjusting the overall brightness, specific zone-based adjustments to the brightness are made based on the contrast ratio.

[0099] Based on the overall brightness adjustment, the brightness of each zone is adjusted according to the contrast and the corresponding user fatigue level. In a bright environment, the brightness of the bright areas has been basically adapted to the ambient light during the overall brightness adjustment in step S51. At this time, adjusting the brightness of the dark areas according to the fatigue level can effectively counteract the ambient light and reduce the contrast. In a dark environment, the brightness of the dark areas has been basically adapted to the ambient light during the overall brightness adjustment in step S51. At this time, adjusting the brightness of the bright areas according to the fatigue level can effectively counteract the ambient light and reduce the contrast, thereby further improving the visual comfort of the user.

[0100] See Figure 3 The specific steps for adjusting brightness and contrast include:

[0101] S521: Monitor the brightness value of each area, mark the area with the highest brightness value as the bright area and the area with the lowest brightness value as the dark area, and extract the brightness values ​​of the brightest and darkest areas, and calculate the contrast of the brightest and darkest areas.

[0102] S522: Determine whether the contrast between the maximum and minimum bright areas is excessive based on the threshold. If the contrast value exceeds the threshold, make targeted adjustments based on the ambient brightness. If the ambient environment is bright, increase the brightness value of the minimum bright area until the contrast reaches the threshold; if the ambient environment is dark, decrease the brightness value of the maximum bright area until the contrast reaches the threshold.

[0103] S523: Detect the contrast between the maximum and minimum bright areas again. If the contrast exceeds the threshold, repeat the S522 operation to make the contrast meet the threshold.

[0104] S524: Extract the user's average fatigue level, and adjust the bright and dark areas accordingly based on the user's average fatigue level and the ambient light level. If the ambient light is bright, increase the brightness of the dark areas based on the user's average fatigue level; if the ambient light is dark, decrease the brightness of the bright areas based on the user's average fatigue level.

[0105] For example, in a bright environment, on a display screen, the brightness is divided into zones 1-5, 10-13, and 21-24; the dark areas are divided into zones 6-9, 17-21, and 32-35. First, the maximum and minimum bright areas are adjusted: the maximum bright area is zone 2, corresponding to a brightness of 800 nits; the minimum bright area is zone 7, corresponding to a brightness of 50 nits; the contrast ratio is 800:50=16; the threshold is 10. Since the contrast ratio exceeds the threshold, the minimum bright area is increased from 50 to 80. At this point, the contrast ratio is 800:80=10, meeting the requirements. The contrast ratio of the maximum and minimum bright areas is checked again. If the contrast ratio exceeds the threshold, the above operation is repeated until the contrast ratio meets the threshold; ensuring that there are no over-contrast areas in the zones.

[0106] Secondly, the bright and dark areas are adjusted as a whole: the average fatigue level of effective users is moderate fatigue at this time, and the brightness adjustment weight is 1.3. In a bright environment, the brightness of the dark areas is increased, and the brightness of the corresponding areas 6-9, 17-21, and 32-35 in the dark area is increased to 1.3 times the original brightness.

[0107] S53: Adjustment of brightness uniformity:

[0108] Insufficient screen brightness uniformity can lead to uneven brightness in certain areas of the screen, causing users to frequently adjust their gaze and increasing fatigue.

[0109] After adjusting the brightness of a certain area based on contrast, the brightness of surrounding areas may differ significantly from that area, resulting in insufficient brightness uniformity in localized areas of the screen and uneven brightness transitions between adjacent areas. To improve the visual comfort of active users, the impact of uniformity needs further consideration.

[0110] See Figure 4 The specific steps for adjusting brightness uniformity include:

[0111] S531: Extract the brightness values ​​of each partition, and calculate the absolute value of the brightness difference between the four neighboring partitions above, below, left, and right for each partition.

[0112] S532: Take the maximum value of the absolute value of the brightness difference as the evaluation value of the brightness uniformity of the partition. If the evaluation value is greater than the threshold, it is judged as non-uniform.

[0113] S533: Calculate the difference between the maximum absolute value of the brightness difference of the uneven partition and the threshold.

[0114] S534: Based on the difference as the basic brightness transition value, perform brightness transition processing on uneven zones according to the transition weight of the average fatigue level of effective users.

[0115] For example: In an LED backlight, the position coordinates of each zone are (x, y). The brightness of zone (3, 3) is 700 nits. The brightness of the adjacent zones above, below, left, and right are 200 nits, 300 nits, 250 nits, and 200 nits, respectively. The maximum absolute difference in brightness is 500 nits, which is greater than the threshold of 300 nits. The difference between the maximum absolute difference in brightness and the threshold is 200 nits. The transition weights for the average low, medium, and high fatigue levels of effective users are 1.0, 1.3, and 1.6, respectively. When the average fatigue level of effective users is medium fatigue, the transition brightness is 200 * 1.3 = 260 nits, and the brightness transition of zone (3.3) is 700 - 260 = 440 nits.

[0116] Example 2

[0117] See Figure 5 This embodiment also provides an LED backlight dynamic dimming system, which specifically includes: a data acquisition module, a data processing and judgment module, a color temperature adjustment module, and a brightness adjustment module;

[0118] Data acquisition module: used to divide the backlight area and acquire the brightness data and RGB data of the image; use a color temperature sensor to acquire the RGB data of the environment, use a photoresistor to acquire the brightness data of the outside world, and use an infrared camera and gyroscope to acquire the blink count, pupil diameter and fixation time data of the effective user's eyes.

[0119] Data processing and judgment module: Determines whether it is day or night based on time data; determines whether it is a dark or bright environment based on ambient brightness data; determines whether the current color temperature is a warm or cool color temperature environment based on ambient color temperature data; and judges and calculates the average fatigue level of effective users based on blink count, pupil diameter, fixation time, and number of effective users.

[0120] Color temperature adjustment module: Adjusts the color temperature based on the ambient color temperature and the fatigue level of the user.

[0121] Brightness adjustment module: Adjusts the brightness, contrast, and uniformity sequentially based on the average fatigue level of active users;

[0122] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A dynamic dimming method for an LED backlight, characterized in that: This includes the following steps: S1: The backlight area is divided into several zones along the horizontal and vertical directions using 2D dimming in the local dimming method; S2: Acquire the frame sequence of the image displayed on the LED screen, extract the brightness values ​​of each partition in the image frame sequence, and the RGB data of the image; and collect external environmental data and effective user eye condition data; the effective user refers to a user whose gaze time is greater than 10 minutes; S3: Perform data correspondence pattern judgment and effective user eye fatigue level judgment; S4: Adjust the color temperature based on the ambient color temperature and the average fatigue level of the effective users; S5: Adjust the brightness level, brightness contrast, and brightness uniformity sequentially based on the average fatigue level of effective users; The effective users can be multiple; the average fatigue level is calculated as follows: extract the fatigue level of each effective user, low fatigue corresponds to fatigue level 1, medium fatigue corresponds to fatigue level 2, and high fatigue corresponds to fatigue level 3. The average fatigue level is calculated using the mean method, and the average fatigue level is rounded to obtain the final average fatigue level of the effective users. The specific steps for adjusting the color temperature include: S41: Determine if the current mode is day / night; determine if the external environment is warm / cool color temperature; retrieve the average fatigue level of active users; S42: When the external environment is warm color temperature, under the main tone of day / night mode, the LED backlight color temperature is increased accordingly based on the average fatigue level of effective users. S43: When the external environment is cool color temperature, under the main theme of day / night mode, the LED backlight color temperature value is reduced accordingly based on the average fatigue level of effective users. The specific steps for adjusting the brightness include: S511: Obtain the ambient light level and average fatigue level of active users; S512: The external environment is dark. The brightness of the entire area is reduced based on the degree of darkness and the average fatigue level of the effective users. S513: The external environment is a bright environment. The brightness of the entire area is increased based on the brightness of the environment and the average fatigue level of the effective users. The specific steps for adjusting the brightness and contrast include: S521: Monitor the brightness value of each area, mark the area with the highest brightness value as the bright area and the area with the lowest brightness value as the dark area, and extract the brightness values ​​of the brightest and darkest areas, and calculate the contrast of the brightest and darkest areas. S522: Determine whether the contrast between the maximum and minimum bright areas is excessive based on the threshold. If the contrast value exceeds the threshold, make targeted adjustments based on the ambient brightness. If the ambient environment is bright, increase the brightness value of the minimum bright area until the contrast reaches the threshold; if the ambient environment is dark, decrease the brightness value of the maximum bright area until the contrast reaches the threshold. S523: Detect the contrast between the maximum and minimum bright areas again. If the contrast exceeds the threshold, repeat the S522 operation to make the contrast meet the threshold. S524: Extract the user's average fatigue level, and adjust the bright and dark areas accordingly based on the user's average fatigue level and the ambient light. If the ambient light is bright, increase the brightness of the dark areas based on the user's average fatigue level; if the ambient light is dark, decrease the brightness of the bright areas based on the user's average fatigue level.

2. The LED backlight dynamic dimming method according to claim 1, characterized in that: The external environment data includes: time data, ambient brightness data, and ambient color temperature data; the effective user eye condition data includes: blink frequency, pupil size, fixation time, and number of effective users.

3. The LED backlight dynamic dimming method according to claim 1, characterized in that: The data correspondence mode interpretation specifically includes: determining whether it is daytime or nighttime based on time data; determining whether it is a low-light or high-light environment based on ambient brightness; and determining whether the current environment is a cool color temperature environment or a warm color temperature environment based on ambient color temperature value data.

4. The LED backlight dynamic dimming method according to claim 1, characterized in that: The determination of effective user eye fatigue level specifically includes: Define the parameter ranges for blink frequency, pupil diameter, and fixation time corresponding to different levels of fatigue; Logical judgment of effective user fatigue level based on parameter range, including: Low fatigue: Any two parameters are in the low fatigue range; Medium fatigue: Any two parameters are in the medium fatigue range; High fatigue: Any two parameters are in the high fatigue range.

5. The LED backlight dynamic dimming method according to claim 1, characterized in that: The specific steps for adjusting the brightness uniformity include: S531: Extract the brightness values ​​of each partition, and calculate the absolute value of the brightness difference between the four neighboring partitions above, below, left, and right for each partition. S532: Take the maximum value of the absolute value of the brightness difference as the evaluation value of the brightness uniformity of the partition. If the evaluation value is greater than the threshold, it is judged as non-uniform. S533: Calculate the difference between the maximum absolute value of the brightness difference of the uneven partition and the threshold. S534: Based on the difference as the basic brightness transition value, perform brightness transition processing on uneven zones according to the transition weight of the average fatigue level of effective users.

6. An LED backlight dynamic dimming system, employing the LED backlight dynamic dimming method as described in any one of claims 1-5, characterized in that: It includes a data acquisition module, a data processing and judgment module, a color temperature adjustment module, and a brightness adjustment module; Data acquisition module: used to divide the backlight area and acquire the brightness data and RGB data of the image; use a color temperature sensor to acquire the RGB data of the environment, use a photoresistor to acquire the brightness data of the outside world, and use an infrared camera and gyroscope to acquire the blink count, pupil diameter and fixation time data of the effective user's eyes. Data processing and judgment module: Determines whether it is day or night based on time data; determines whether it is a dark or bright environment based on ambient brightness data; determines whether the current color temperature is a warm or cool color temperature environment based on ambient color temperature data; and judges and calculates the average fatigue level of effective users based on blink count, pupil diameter, fixation time, and number of effective users. Color temperature adjustment module: Adjusts the color temperature based on the ambient color temperature and the fatigue level of the user. Brightness adjustment module: Adjusts brightness level, brightness contrast and brightness uniformity sequentially based on the average fatigue level of effective users.

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