CN115810336A - Screen backlight brightness adjusting method and system and display device - Google Patents
Screen backlight brightness adjusting method and system and display device Download PDFInfo
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Abstract
The application relates to a screen backlight brightness adjusting method, a system and a display device, wherein the method comprises the following steps: sequentially acquiring a plurality of original illumination intensity data of a screen at a plurality of preset moments; calculating the average illumination intensity of the screen according to the plurality of original illumination intensity data; filtering and anti-shaking processing is carried out on the average illumination intensity; sampling the average illumination intensity data subjected to filtering anti-shake processing for multiple times at a preset sampling frequency, and judging whether the difference value between the average illumination intensity obtained by each sampling and the last effective illumination intensity is larger than a preset illumination intensity difference value threshold value or not; if the difference is smaller than the illumination intensity difference threshold, adjusting the backlight brightness of the screen to the average illumination intensity obtained by the last sampling within the preset variation time; if the difference is larger than the illumination intensity difference threshold, the backlight brightness of the screen is adjusted to the average illumination intensity obtained by the sampling within the preset variation time. The scheme of the application can avoid the situation that the screen backlight changes suddenly and jumps frequently.
Description
Technical Field
The application relates to the technical field of screen brightness adjustment, in particular to a screen backlight brightness adjusting method, a screen backlight brightness adjusting system and a display device.
Background
Some project cabins have the function of automatically adjusting the screen backlight brightness, but the user experience is not very friendly, and the following problems mainly exist: 1. in the driving process of a user, the screen backlight brightness changes frequently, screen flicker visible to human eyes occurs, and the situation is more obvious particularly under a mottled buckeye tree shadow and a section of viaduct. 2. The screen backlight brightness cannot be smoothly adjusted accurately according to the real-time external environment brightness when entering and exiting the underground garage.
In view of the above problems, those skilled in the art have sought solutions.
Disclosure of Invention
The technical problem to be solved by the present application is to provide a method, a system and a display device for adjusting the backlight brightness of a screen, so as to avoid the backlight brightness and dim and frequent sudden change and jump of the screen.
In order to achieve the above purpose, the present application is implemented by the following technical solutions:
a screen backlight brightness adjusting method is used for adjusting the backlight brightness of a screen and comprises the following steps:
sequentially acquiring a plurality of original illumination intensity data of the screen at a plurality of preset moments;
calculating an average illumination intensity of the screen according to the plurality of original illumination intensity data;
carrying out filtering anti-shaking processing on the average illumination intensity;
sampling the average illumination intensity data subjected to filtering anti-shake processing for multiple times at a preset sampling frequency to obtain multiple average illumination intensities, and judging whether the difference value between the average illumination intensity obtained by each sampling and the last effective illumination intensity is larger than a preset illumination intensity difference value threshold value or not;
if the difference value is smaller than the illumination intensity difference value threshold value, taking the average illumination intensity obtained by the last sampling as an effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset variation time length;
and if the difference is greater than the illumination intensity difference threshold, taking the average illumination intensity obtained by the sampling as the effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset variation time length.
Optionally, the calculating the average illumination intensity data of the screen according to the plurality of raw illumination intensity data comprises:
when the number of the recorded original illumination intensity data reaches a preset number threshold, removing a maximum original illumination intensity data and a minimum original illumination intensity data from the original illumination intensity data, and then calculating an average value of the remaining original illumination intensity data as the average illumination intensity data of the screen.
Optionally, the calculating the average illumination intensity data of the screen according to the plurality of raw illumination intensity data further comprises: after the average value of the remaining original illumination intensity data is calculated and used as the average illumination intensity data of the screen, when the next original illumination intensity data is acquired at the next preset time, deleting the original illumination intensity data which is acquired first, and keeping the sum of the number of the recorded original illumination intensity data and the number of the newly acquired original illumination intensity data as the number threshold.
Optionally, the filtering and anti-shaking processing the average illumination intensity data includes:
calculating the target average illumination intensity of the filtering anti-shake processing according to the following formula: the average target illumination intensity = filter coefficient of the filtering anti-shake processing this time, the average illumination intensity obtained by the sampling this time + (1-filter coefficient) and the average target illumination intensity of the filtering anti-shake processing last time;
adjusting the illumination intensity of the screen to the target average illumination intensity of the filtering anti-shake processing;
the value range of the filter coefficient is a preset value between 0 and 1.
Optionally, the step of adjusting the backlight brightness of the screen to the target brightness within a preset variation time period includes:
if the difference value is smaller than the preset illumination intensity data threshold value, determining a first screen driving signal required for adjusting the illumination intensity of the screen according to the average illumination intensity obtained by the last sampling, obtaining a corresponding first PWM duty ratio according to the first electric signal, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time according to the first PWM duty ratio;
if the difference value is larger than the preset illumination intensity data threshold value, determining a second screen driving signal required for adjusting the screen illumination intensity according to the effective illumination intensity, acquiring a corresponding second PWM duty ratio according to the second electric signal, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time according to the second PWM duty ratio.
The present application further provides a screen backlight brightness adjusting system, including: the system comprises a photosensitive sensor, a host controller and a screen backlight module;
the photosensitive sensor is arranged in the screen backlight module, and the host controller is respectively in wireless connection with the photosensitive sensor and the screen backlight module;
the photosensitive sensor is used for sequentially acquiring a plurality of original illumination intensity data of the screen at a plurality of preset moments;
the screen backlight module is used for transmitting the original illumination intensity data to the host controller;
the host controller is used for calculating the average illumination intensity of the screen according to the original illumination intensity data and carrying out filtering anti-shake processing on the average illumination intensity;
the host controller and the screen backlight module are further used for: sampling the average illumination intensity data subjected to filtering anti-shake processing for multiple times at a preset sampling frequency to obtain multiple average illumination intensities, and judging whether the difference value between the average illumination intensity obtained by each sampling and the last effective illumination intensity is larger than a preset illumination intensity difference value threshold value or not; if the difference value is smaller than the illumination intensity difference value threshold value, taking the average illumination intensity obtained by the last sampling as an effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time period; and if the difference value is larger than the illumination intensity difference value threshold value, taking the average illumination intensity obtained by the sampling as the effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time period.
Optionally, the host controller is further configured to: and when the number of the recorded original illumination intensity data reaches a preset number threshold, removing a maximum original illumination intensity data and a minimum original illumination intensity data from the original illumination intensity data, and then calculating the average value of the remaining original illumination intensity data as the average illumination intensity data of the screen.
Optionally, the host controller is further configured to: after the average value of the remaining original illumination intensity data is calculated and used as the average illumination intensity data of the screen, when the next original illumination intensity data is obtained at the next preset moment, deleting the original illumination intensity data which is obtained at first, and keeping the sum of the number of the recorded original illumination intensity data and the number of the newly obtained original illumination intensity data as the number threshold.
Optionally, the host controller is further configured to determine, according to the average illumination intensity data obtained by the last sampling, a first screen driving signal required for adjusting the screen illumination intensity and obtain a corresponding first PWM duty ratio according to the first electrical signal, or determine, according to the effective illumination intensity data, a second screen driving signal required for adjusting the screen illumination intensity and obtain a corresponding second PWM duty ratio according to the second electrical signal;
and the screen backlight module is further used for adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time according to the first PWM duty ratio, or adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time according to the second PWM duty ratio.
The application also provides a display device which comprises the screen backlight brightness adjusting system.
The application provides a screen backlight brightness adjusting method, a screen backlight brightness adjusting system and a display device.
In order to make the aforementioned and other objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
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The present application is described in detail below with reference to the attached drawings and detailed description;
fig. 1 is a schematic flowchart illustrating a method for adjusting brightness of a backlight of a screen according to an embodiment of the present application;
fig. 2 is a functional block diagram of a screen backlight brightness adjusting system according to an embodiment of the present application.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 is a schematic flow chart of a screen backlight brightness adjusting method according to an embodiment of the present application, and referring to fig. 1, the present application provides a screen backlight brightness adjusting method for adjusting backlight brightness of a screen, including the following steps:
s1: the method comprises the steps of sequentially obtaining a plurality of original illumination intensity data of a screen at a plurality of preset moments.
In one embodiment, the predetermined time is set to 300ms. And acquiring light sensing signal data every 300ms, and updating the light sensing signal data into 22 buffers with the size of the original light intensity data so as to facilitate subsequent data processing.
S2: an average light intensity of the screen is calculated from the plurality of raw light intensity data.
In one embodiment, step S2 includes: after a plurality of original illumination intensity data are acquired for the first time, primary filtering processing is carried out on all the original illumination intensity data acquired for the first time. In order to make the effect of gradually changing the screen backlight brightness better, an average value, that is, primary filtering processing, is respectively calculated for 21 original illumination intensity data acquired for the first time, specifically, for the 21 original illumination intensity data after the screen is turned on and lightened, filtering processing is performed in a manner of X1/1, (X1 + X2)/2, (X1 + X2+ X3)/3 … (X1 + X2+ X3+ … + X21)/21, and the 22 nd original illumination intensity data is not subjected to the primary filtering processing.
Optionally, step S2 includes:
and when the number of the recorded original illumination intensity data reaches a preset number threshold, removing a maximum original illumination intensity data and a minimum original illumination intensity data from the original illumination intensity data, and then calculating the average value of the remaining original illumination intensity data to be used as the average illumination intensity data of the screen.
Optionally, step S2 further includes: after the average value of the remaining original illumination intensity data is calculated to be used as the average illumination intensity data of the screen, when the next original illumination intensity data is obtained at the next preset moment, the original illumination intensity data obtained firstly is deleted, and the sum of the number of the recorded original illumination intensity data and the number of the newly obtained original illumination intensity data is kept as a number threshold. Illustratively, according to the first-in first-out principle, in the second 300ms, the 23 rd data is acquired, the data X1/1 is discarded, and the original data X2 is promoted to the first bit in the Buffer-stored data.
S3: and carrying out filtering anti-shaking processing on the average illumination intensity.
Optionally, step S3 includes:
calculating the target average illumination intensity of the filtering anti-shake processing according to the following formula: the average target illumination intensity = filter coefficient of the filtering anti-shake processing this time, the average illumination intensity obtained by the sampling this time + (1-filter coefficient) and the average target illumination intensity of the filtering anti-shake processing last time;
adjusting the illumination intensity of the screen to the target average illumination intensity of the filtering anti-shake processing;
the value range of the filter coefficient is a preset value between 0 and 1.
The smaller the filter coefficient is, the smoother the filtering result of the target average illumination intensity is, but the lower the screen response sensitivity is; the larger the filter coefficient is, the higher the screen response sensitivity is, but the poorer the smoothness of the filter result is, the more unstable the adjustment result of the screen brightness is. Specifically, the selection of the filter coefficient needs to be continuously tested according to a method of approaching two ends in the real vehicle process, and a proper filter coefficient value is debugged, for example, the filter coefficient is firstly debugged by using 0.2, if the backlight adjustment is not linear and smooth enough, then the filter coefficient is selected by using 0.3, and so on, and the two ends are continuously approached, so that the filter coefficient suitable for the vehicle type can be selected.
S4: and sampling the average illumination intensity data subjected to the filtering anti-shake processing for multiple times at a preset sampling frequency to obtain multiple average illumination intensities, and judging whether the difference value between the average illumination intensity obtained by each sampling and the last effective illumination intensity is larger than a preset illumination intensity difference value threshold value or not.
S5: and if the difference value is smaller than the illumination intensity difference value threshold value, taking the average illumination intensity obtained by the last sampling as the effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within the preset variation time length.
S6: if the difference value is larger than the illumination intensity difference value threshold value, the average illumination intensity obtained by the sampling is used as the effective illumination intensity, and the backlight brightness of the screen is adjusted to the effective illumination intensity within the preset change time.
In one embodiment, the preset sampling frequency is 3 s/time, and the preset illumination intensity difference threshold is 200 lux. In other embodiments, other sampling frequencies and illumination intensity difference thresholds may be selected according to the specific situation of the screen.
The exemplary explanation of steps S4, S5, S6 is as follows:
the average illumination intensity obtained by the 0 th sampling is 1750l ux, the average illumination intensity obtained by the 3 rd sampling is 1600l ux, the average illumination intensity obtained by the 6 th sampling is 1450l ux, no illumination intensity data is obtained before the 0 th second, and the illumination intensity at the 0 th second is the effective illumination intensity by default. The difference value of the illumination intensity of the 0 th second and the 3 rd second is less than 200, the illumination intensity of the 0 th second is effective illumination intensity, and the brightness of the screen is adjusted according to the illumination intensity of the 0 th second; the difference value of the illumination intensity of the 0 th second and the 6 th second is more than 200, the average illumination intensity sampled and obtained in the 6 th second is the new effective illumination intensity, and the screen adjusts the brightness according to the average illumination intensity obtained in the 6 th second; if the difference value of the illumination intensity of the 9 th second and the 6 th second is less than 200, the screen adjusts the brightness according to the average illumination intensity obtained in the 6 th second; if the difference between the 12 th second and the 6 th second is greater than 200, the average illumination intensity obtained by sampling the 12 th second is the new effective illumination intensity which is the latest effective illumination intensity, and the screen adjusts the brightness according to the average illumination intensity obtained by sampling the 12 th second.
Optionally, the step of adjusting the backlight brightness of the screen to the target brightness within a preset variation time period includes:
if the difference value is smaller than a preset illumination intensity data threshold value, determining a first screen driving signal required for adjusting the illumination intensity of the screen according to the average illumination intensity obtained by last sampling, obtaining a corresponding first PWM duty ratio according to the first electric signal, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time according to the first PWM duty ratio; if the difference value is larger than the preset illumination intensity data threshold value, determining a second screen driving signal required for adjusting the illumination intensity of the screen according to the effective illumination intensity, acquiring a corresponding second PWM duty ratio according to a second electric signal, and adjusting the backlight brightness of the screen to the effective illumination intensity within the preset change time according to the second PWM duty ratio.
In one embodiment, the step of adjusting the backlight brightness of the screen to the target brightness within a preset variation time period further includes:
setting the illumination intensity grade of the screen according to the ambient illumination intensity;
defining the total change time of screen backlight brightness adjustment, and acquiring preset change duration according to the total change time/(highest illumination intensity grade-lowest illumination intensity grade) — (current illumination intensity grade-target illumination intensity grade);
and adjusting the backlight brightness of the screen to the target brightness within a preset change time length.
Generally, the illumination intensity level needs to be calibrated according to the actual vehicle, and the calibration is to judge the brightness level according to the corresponding relation between the illumination intensity data output by the photosensitive sensor and the ambient light, the installation position of the sensor and the brightness of the screen in the vehicle under various vehicle using scenes. Table 1 is the correspondence of the measured illumination intensity data to the ambient light:
note: the data in table 1 are for reference only.
Table 2 is the rating of the screen according to this sensor output value when the sensor is mounted on the side of the instrument desk:
note: the data in table 2 are for reference only.
Illustratively, according to table 2, the total time of change from the lowest illumination intensity level to the highest illumination intensity level is defined as 5000ms (reference value, specific parameters are based on actual project calibration/configuration), the time of change of each illumination intensity level is 5000 ms/(10-1), the current illumination intensity level is 5, the target illumination intensity level is 2, and the screen backlight brightness needs to be smoothly changed from the current illumination intensity level to the target illumination intensity level in 5000/(10-1) × (5-2) ms.
Fig. 2 is a functional block diagram of a screen backlight brightness adjusting system according to an embodiment of the present application, please refer to fig. 2, the present application further provides a screen backlight brightness adjusting system, including: photosensitive sensor 10, host controller 20, screen backlight module 30.
The photosensitive sensor 10 is used for sequentially acquiring a plurality of original illumination intensity data of the screen at a plurality of preset moments; the screen backlight module is used for transmitting the original illumination intensity data to the host controller 20; the host controller 20 is configured to calculate an average illumination intensity of the screen according to the plurality of raw illumination intensity data, and perform filtering anti-shake processing on the average illumination intensity.
The host controller 20 and the screen backlight module are further configured to: sampling the average illumination intensity data subjected to filtering anti-shake processing for multiple times at a preset sampling frequency to obtain multiple average illumination intensities, and judging whether the difference value between the average illumination intensity obtained by each sampling and the last effective illumination intensity is larger than a preset illumination intensity difference value threshold value or not; if the difference value is smaller than the illumination intensity difference value threshold value, taking the average illumination intensity obtained by the last sampling as the effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within the preset change time length; and if the difference value is larger than the illumination intensity difference value threshold value, taking the average illumination intensity obtained by the sampling as the effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within the preset variation time length.
Optionally, the host controller 20 is further configured to: and when the number of the recorded original illumination intensity data reaches a preset number threshold, removing a maximum original illumination intensity data and a minimum original illumination intensity data from the original illumination intensity data, and then calculating the average value of the remaining original illumination intensity data to be used as the average illumination intensity data of the screen.
Optionally, the host controller 20 is further configured to: and after the average value of the residual original illumination intensity data is calculated and used as the average illumination intensity data of the screen, deleting the original illumination intensity data which is obtained firstly when the next original illumination intensity data is obtained at the next preset moment, and keeping the sum of the number of the recorded original illumination intensity data and the number of the newly obtained original illumination intensity data at the number threshold.
Optionally, the host controller 20 is further configured to determine, according to the average illumination intensity data obtained by the last sampling, a first screen driving signal required for adjusting the screen illumination intensity and obtain a corresponding first PWM duty ratio according to the first electrical signal, or determine, according to the effective illumination intensity data, a second screen driving signal required for adjusting the screen illumination intensity and obtain a corresponding second PWM duty ratio according to the second electrical signal; and the screen backlight module is also used for adjusting the backlight brightness of the screen to the effective illumination intensity within the preset change duration according to the first PWM duty ratio, or adjusting the backlight brightness of the screen to the effective illumination intensity within the preset change duration according to the second PWM duty ratio.
In one embodiment, the photosensitive sensor 10 is installed inside the screen backlight module 30 (i.e. a large screen), which facilitates communication and makes the intensity of light received by the photosensitive sensor 10 consistent with that of the screen backlight module 30. The screen backlight module 30 communicates with the photosensitive sensor 10 in an I2C mode, and the host controller 30 communicates with the screen backlight module 30 through another I2C mode to transmit illumination intensity data. On one hand, the screen backlight module 30 transmits the illumination data to the host controller 20, on the other hand, the host controller 20 sends the PWM wave duty ratio data for adjusting the backlight brightness to the screen backlight module 30, and the screen backlight module 30 outputs the corresponding PWM wave to adjust the backlight brightness of the screen according to the duty ratio.
The application also provides a display device which comprises the screen backlight brightness adjusting system.
The scheme of this application has greatly promoted user experience, improves and uses car security. The processed screen does not have the conditions of sudden and dark backlight, frequent sudden change and jumping, and backlight change can be similar to the backlight automatic adjustment of a mobile phone screen and has the effect of linear smooth change. However, the scheme of the application needs to repeat the real vehicle test verification for many times, and various weather, scenes and working conditions are verified as much as possible.
It is to be understood that both the foregoing general principles and the principal features of the application, and the advantages thereof, have been shown and described. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the embodiments and descriptions are only illustrative of the principles of the application, and any modification, equivalent replacement or improvement made within the spirit and principle of the application should be included in the protection scope of the application.
Claims (10)
1. A screen backlight brightness adjusting method is used for adjusting the backlight brightness of a screen, and is characterized by comprising the following steps:
sequentially acquiring a plurality of original illumination intensity data of the screen at a plurality of preset moments;
calculating an average illumination intensity of the screen according to the plurality of original illumination intensity data;
carrying out filtering anti-shaking processing on the average illumination intensity;
sampling the average illumination intensity data subjected to filtering anti-shake processing for multiple times at a preset sampling frequency to obtain multiple average illumination intensities, and judging whether the difference value between the average illumination intensity obtained by each sampling and the last effective illumination intensity is larger than a preset illumination intensity difference value threshold value or not;
if the difference value is smaller than the illumination intensity difference value threshold value, taking the average illumination intensity obtained by the last sampling as an effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset variation time length;
and if the difference is greater than the illumination intensity difference threshold, taking the average illumination intensity obtained by the sampling as the effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset variation time length.
2. The screen backlight luminance adjustment method of claim 1, wherein the calculating the average illumination intensity data of the screen from the plurality of raw illumination intensity data comprises:
when the number of the recorded original illumination intensity data reaches a preset number threshold, removing a maximum original illumination intensity data and a minimum original illumination intensity data from the original illumination intensity data, and then calculating an average value of the remaining original illumination intensity data as the average illumination intensity data of the screen.
3. The screen backlight luminance adjusting method of claim 2, wherein the calculating the average illumination intensity data of the screen from the plurality of raw illumination intensity data further comprises: after the average value of the remaining original illumination intensity data is calculated and used as the average illumination intensity data of the screen, when the next original illumination intensity data is acquired at the next preset time, deleting the original illumination intensity data which is acquired first, and keeping the sum of the number of the recorded original illumination intensity data and the number of the newly acquired original illumination intensity data as the number threshold.
4. The screen backlight brightness adjustment method of claim 1, wherein the filtering anti-shaking processing the average illumination intensity data comprises:
calculating the target average illumination intensity of the filtering anti-shake processing according to the following formula: the average target illumination intensity = filter coefficient of the filtering anti-shake processing this time, the average illumination intensity obtained by the sampling this time + (1-filter coefficient) and the average target illumination intensity of the filtering anti-shake processing last time;
adjusting the illumination intensity of the screen to the target average illumination intensity of the filtering anti-shake processing;
the value range of the filter coefficient is a preset value between 0 and 1.
5. The screen backlight brightness adjusting method of claim 1, wherein the step of adjusting the backlight brightness of the screen to the target brightness within a preset variation time period comprises:
if the difference value is smaller than the preset illumination intensity data threshold value, determining a first screen driving signal required for adjusting the screen illumination intensity according to the average illumination intensity obtained by the last sampling, obtaining a corresponding first PWM duty ratio according to the first electric signal, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change duration according to the first PWM duty ratio;
if the difference value is larger than the preset illumination intensity data threshold value, determining a second screen driving signal required for adjusting the screen illumination intensity according to the effective illumination intensity, acquiring a corresponding second PWM duty ratio according to the second electric signal, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time according to the second PWM duty ratio.
6. A screen backlight brightness adjustment system, comprising: the system comprises a photosensitive sensor, a host controller and a screen backlight module;
the photosensitive sensor is arranged in the screen backlight module, and the host controller is respectively in wireless connection with the photosensitive sensor and the screen backlight module;
the photosensitive sensor is used for sequentially acquiring a plurality of original illumination intensity data of the screen at a plurality of preset moments;
the screen backlight module is used for transmitting the original illumination intensity data to the host controller;
the host controller is used for calculating the average illumination intensity of the screen according to the original illumination intensity data and carrying out filtering anti-shake processing on the average illumination intensity;
the host controller and the screen backlight module are further used for: sampling the average illumination intensity data subjected to filtering anti-shake processing for multiple times at a preset sampling frequency to obtain multiple average illumination intensities, and judging whether the difference value between the average illumination intensity obtained by each sampling and the last effective illumination intensity is larger than a preset illumination intensity difference value threshold value or not; if the difference value is smaller than the illumination intensity difference value threshold value, taking the average illumination intensity obtained by the last sampling as an effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time period; and if the difference value is larger than the illumination intensity difference value threshold value, taking the average illumination intensity obtained by the sampling as the effective illumination intensity, and adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time period.
7. The screen backlight brightness adjustment system of claim 6, wherein the host controller is further configured to: and when the number of the recorded original illumination intensity data reaches a preset number threshold, removing a maximum original illumination intensity data and a minimum original illumination intensity data from the original illumination intensity data, and then calculating the average value of the remaining original illumination intensity data as the average illumination intensity data of the screen.
8. The screen backlight brightness adjustment system of claim 7, wherein the host controller is further configured to: after the average value of the remaining original illumination intensity data is calculated and used as the average illumination intensity data of the screen, when the next original illumination intensity data is acquired at the next preset time, deleting the original illumination intensity data which is acquired first, and keeping the sum of the number of the recorded original illumination intensity data and the number of the newly acquired original illumination intensity data as the number threshold.
9. The screen backlight brightness adjustment system of claim 6, wherein the host controller is further configured to determine a first screen driving signal required to adjust the screen illumination intensity according to the average illumination intensity data obtained from the last sampling and obtain a corresponding first PWM duty ratio according to the first electrical signal, or determine a second screen driving signal required to adjust the screen illumination intensity according to the effective illumination intensity data and obtain a corresponding second PWM duty ratio according to the second electrical signal;
and the screen backlight module is further used for adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time according to the first PWM duty ratio, or adjusting the backlight brightness of the screen to the effective illumination intensity within a preset change time according to the second PWM duty ratio.
10. A display device comprising the screen backlight brightness adjustment system according to any one of claims 6 to 9.
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