A backlight partition control method and system for a display device

Abstract

A backlight zoning control method and system for a display device, wherein the method includes the following steps: dividing the display device into a plurality of control areas, wherein the control areas include a long-lighting area and a non-long-lighting area; dividing the functions on the display device into a long-lighting function and a non-long-lighting function according to the display logic of the functions; setting the long-lighting function in the long-lighting area, and setting the non-long-lighting function in the non-long-lighting area, wherein the long-lighting function in the long-lighting area is electrically connected to a switch, and the non-long-lighting area is electrically connected to an MCU; when the display device receives the needs of a business scene, the non-long-lighting function in the non-long-lighting area is controlled by the MCU to perform backlight display, and when the business scene disappears, the MCU controls the non-long-lighting function to be turned off. While not affecting the normal driving of the driver, the luminous time of the HUD backlight can be effectively reduced, thereby reducing the overall device temperature of the HUD and increasing the use time and practicality of the HUD.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and in particular to a backlight partition control method and system for a display device. Background Art

[0002] Backlight is a form of lighting in the electronics industry, often used in LCD displays. The difference between backlight and frontlight is that backlight is illuminated from the side or back, and is used to increase the illumination in low-light environments and the brightness on computer monitors and LCD screens, producing light in a similar way to CRT displays.

[0003] Now the technology of HUD display is becoming more and more mature. It is not only used in military but also in civil applications, such as navigation information display in civil aviation or car driving. Compared with military applications, the duration of civil applications is longer. For the backlight long-brightness function of HUD, its energy consumption is relatively high, so the backlight long-brightness heats up more and requires higher heat dissipation performance of the whole machine. At present, the display devices in most vehicles are relatively simple and have poor heat dissipation performance. If most areas of the display device are in the backlight long-brightness state for a long time, it is easy to cause the display device to be damaged due to excessive temperature. Therefore, a method and system that can effectively balance the backlight long-brightness function of the display device is urgently needed. Summary of the invention

[0004] In view of the above-mentioned defects, the purpose of the present invention is to provide a backlight zoning control method and system for a display device to adjust the long-time of the backlight, reduce the heat generated by the device, and increase the service life of the device.

[0005] To achieve this object, the present invention adopts the following technical solution: a backlight partition control method for a display device, comprising the following steps:

[0006] Dividing the display device into a plurality of control areas, wherein the control areas include a long-brightness area and a non-long-brightness area;

[0007] According to the display logic of the function, the functions on the display device are divided into long-light functions and non-long-light functions;

[0008] The long-light function is set in the long-light area, and the non-long-light function is set in the non-long-light area, wherein the long-light function in the long-light area is electrically connected to the switch, and the non-long-light area is electrically connected to the MCU;

[0009] When the display device receives the needs of the business scene, the MCU controls the non-long-light function in the non-long-light area to display the backlight. When the business scene disappears, the MCU controls the non-long-light function to turn off.

[0010] Preferably, when the business scene disappears, the MCU records the duration of the disappearance of the business scene. When the duration of disappearance is less than a time threshold, the brightness of the non-long-light function gradually dims. When the duration of disappearance is greater than the time threshold, the non-long-light function is turned off.

[0011] Preferably, the specific steps of gradually dimming the brightness of the non-constant light function are as follows:

[0012] Step A1: Obtaining the surrounding environment brightness information C1 and the brightness information C2 of the current non-constantly bright area;

[0013] Step A2: Obtaining a brightness information difference ΔC according to the brightness information C1 and the brightness information C2;

[0014] Step A3: Calculate the brightness change rate V according to the brightness information difference ΔC and the time threshold;

[0015] Step A4: When the business scene disappears, the brightness of the non-constant-brightness function is gradually reduced according to the brightness change rate V obtained by the calculation.

[0016] Preferably, the specific steps in performing step A4 are as follows:

[0017] Step A41: obtaining brightness values ​​of each point in the non-constantly bright area, constructing a first one-dimensional space vector, and constructing test data according to the first one-dimensional space vector;

[0018] Step A42: randomly setting the brightness value of each point after the brightness change, constructing a second one-dimensional space vector, and finding the maximum difference C between the first one-dimensional space vector and the second one-dimensional space vector;

[0019] Step A43: Find parameters greater than the maximum difference C in the test data, mark the first set, and obtain ratios Q of all parameters in the first set to the maximum difference C respectively;

[0020] Step A44: Calculate the logarithm of the comparison value Q, and then obtain the average value Z of all logarithms in the test data, wherein the formula for obtaining the average value Z is as follows:

[0021] Where n and k are integers, is the ratio of the kth parameter in the first set to the maximum difference, X1 is the number of parameters in the first set;

[0022] Step A45: Repeat steps A42 to A44 to obtain several average values ​​Z, find the minimum average value Z, and use the brightness values ​​of each point corresponding to the minimum average value Z as the target parameter for the brightness change in the next second.

[0023] A backlight partition control system for a display device, using the backlight partition control method for a display device, comprising a first partitioning module, a second partitioning module, a setting module and a control module;

[0024] The first division module is used to divide the display device into a plurality of control areas, wherein the control area includes a long-bright area and a non-long-bright area;

[0025] The second division module is used to divide the functions on the display device into long-light functions and non-long-light functions according to the display logic of the functions;

[0026] The setting module is used to set the long-brightness function in the long-brightness area, and set the non-long-brightness function in the non-long-brightness area, wherein the long-brightness function in the long-brightness area is electrically connected to the switch, and the non-long-brightness area is electrically connected to the MCU;

[0027] The control module is used to control the non-long-light function in the non-long-light area to perform backlight display through the MCU when the display device receives the needs of the business scene. When the business scene disappears, the MCU controls the non-long-light function to be turned off.

[0028] Preferably, the control module includes a gradual change submodule;

[0029] The gradient submodule is used to call the MCU to record the duration of disappearance of the business scene. When the duration of disappearance is less than the time threshold, the brightness of the non-long-light function gradually dims. When the duration of disappearance is greater than the time threshold, the non-long-light function is turned off.

[0030] Preferably, the gradient submodule includes a brightness acquisition unit, a difference acquisition unit, a change acquisition unit and an execution unit;

[0031] The brightness acquisition unit is used to acquire the surrounding environment brightness information C1 and the brightness information C2 of the current non-constantly bright area;

[0032] The difference acquisition unit is used to obtain a brightness information difference ΔC according to the brightness information C1 and the brightness information C2;

[0033] The change acquisition unit is used to calculate the brightness change rate V according to the brightness information difference ΔC and the time threshold;

[0034] The execution unit is used to gradually reduce the brightness of the non-long-brightness function according to the brightness change rate V obtained by the calculation at the moment when the business scene disappears.

[0035] Preferably, the execution unit includes a construction subunit, a comparison subunit, a ratio subunit, a calculation subunit and a selection subunit;

[0036] The construction subunit is used to obtain the brightness value of each point in the non-constantly bright area, and construct a first one-dimensional space vector, and construct test data according to the first one-dimensional space vector;

[0037] The comparison subunit is used to randomly set the brightness value of each point after the brightness change, and construct a second one-dimensional space vector, and obtain the maximum difference C between the first one-dimensional space vector and the second one-dimensional space vector;

[0038] The ratio subunit is used to find parameters greater than the maximum difference C in the test data, mark the first set, and respectively obtain the ratios Q of all parameters in the first set to the maximum difference C;

[0039] The calculation subunit is used to calculate the logarithm of the comparison value Q, and then obtain the average value Z of all logarithms in the test data;

[0040] The selection subunit is used to re-call the comparison subunit, the ratio subunit and the calculation subunit to obtain several average values ​​Z, find the minimum average value Z, and use the brightness values ​​of each point corresponding to the minimum average value Z as the target parameter of the brightness change in the next second.

[0041] One of the above technical solutions has the following advantages or beneficial effects: without affecting the driver's normal driving, it can effectively reduce the luminous time of the HUD backlight, thereby reducing the overall device temperature of the HUD and increasing the use time and practicality of the HUD. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flow chart of an embodiment of the method of the present invention.

[0043] Figure 2 It is a schematic diagram of the structure of an embodiment of the system of the present invention. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0045] In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] like Figures 1-2 As shown, a backlight partition control method for a display device includes the following steps:

[0048] Dividing the display device into a plurality of control areas, wherein the control areas include a long-brightness area and a non-long-brightness area;

[0049] According to the display logic of the function, the functions on the display device are divided into long-light functions and non-long-light functions;

[0050] The long-light function is set in the long-light area, and the non-long-light function is set in the non-long-light area, wherein the long-light function in the long-light area is electrically connected to the switch, and the non-long-light area is electrically connected to the MCU;

[0051] When the display device receives the needs of the business scene, the MCU controls the non-long-light function in the non-long-light area to display the backlight. When the business scene disappears, the MCU controls the non-long-light function to turn off.

[0052] At present, the display devices in most vehicles are relatively simple, and their heat dissipation performance is poor. If most areas of the display device are in a state of long backlight for a long time, it is easy to cause the display device to be damaged due to excessive temperature. Therefore, in the present invention, the HUD display is divided into several control areas, wherein the shape of the control area can be a rectangular control area, which is convenient for the MCU to control the division of the area and the brightness of the light in the area. The control area is further divided into a long-bright area and a non-long-bright area, and then divided into a long-bright function and a non-long-bright function according to the display logic of the function. For example, in the navigation function, time, wifi, 4G status and vehicle speed need to be lit for a long time, then these functions are long-bright functions, and for example, turn prompts or fork road prompts, which will only appear in a specific section of the road, then these functions will be divided into non-long-bright functions. Then the long-bright function is set in the long-bright area, and the non-long-bright function is set in the non-long-bright area. At this time, the long-bright area is electrically connected to the switch. When the vehicle starts, the control of the current can be controlled by the MCU, and the long-bright function in the long-bright area is directly powered. The non-constant light area is connected to the MCU, and the current is controlled by the MCU. Only when the business scene appears, the MCU will energize the non-constant light function in the non-constant light area to display it. When the business scene disappears, the corresponding non-constant light function will be turned off under the control of the MCU.

[0053] The technical solution proposed in the present invention can effectively reduce the luminous time of the HUD backlight without affecting the normal driving of the driver, thereby reducing the overall device temperature of the HUD and increasing the use time and practicality of the HUD.

[0054] Preferably, when the business scene disappears, the MCU records the duration of the disappearance of the business scene. When the duration of disappearance is less than a time threshold, the brightness of the non-long-light function gradually dims. When the duration of disappearance is greater than the time threshold, the non-long-light function is turned off.

[0055] Since the HUD projects important driving information such as speed and navigation onto the windshield in front of the driver, the driver is very sensitive to changes in information. If the non-long-brightness function disappears directly, a large picture change will occur, thereby affecting the driver's attention. To this end, in the present invention, when the business scene disappears, the component will reduce the brightness of the non-long-brightness function within the time threshold. When the brightness is reduced for a certain period of time (ie, the time threshold), the non-long-brightness function will be directly turned off, thereby avoiding obvious alternation between light and dark and reducing the user experience. The time threshold can be 3 to 5 seconds.

[0056] Preferably, the specific steps of gradually dimming the brightness of the non-constant light function are as follows:

[0057] Step A1: Obtaining the surrounding environment brightness information C1 and the brightness information C2 of the current non-constantly bright area;

[0058] Step A2: Obtaining a brightness information difference ΔC according to the brightness information C1 and the brightness information C2;

[0059] Step A3: Calculate the brightness change rate V according to the brightness information difference ΔC and the time threshold;

[0060] Step A4: When the business scene disappears, the brightness of the non-constant-brightness function is gradually reduced according to the brightness change rate V obtained by the calculation.

[0061] In order to reduce the light-dark alternation caused by brightness changes in the human eyeball. In different environments, the speed of gradual dimming and the brightness of the change are also different. For this reason, in the present invention, the brightness information C1 of the surrounding environment is obtained through an external information sensor. Preferably, the acquisition position of the surrounding brightness information C1 is the brightness information at the front windshield, because the HUD is projected on the front windshield. When the brightness is reduced to the brightness of the front windshield, it can effectively avoid direct light-dark alternation and reduce the driver's sensitivity to screen information changes. Then, the rate of change of brightness required at this moment is calculated by the brightness information difference ΔC and the time threshold. Through the brightness change rate V, the MCU can know how much the brightness needs to be reduced at each moment, so as to better control the non-long-bright function to adjust the brightness. After the time threshold is reached, the brightness of the current non-long-bright function is similar to the brightness of the surrounding front windshield. Although it has not been completely turned off, it is difficult to detect from human vision. After that, directly turning off the non-long-bright function will not cause the driver to have a visual impact of alternating light and dark.

[0062] Similarly, when the display device receives the needs of the business scenario, it can also pre-adjust the brightness of the non-long-brightness function to the ambient brightness, and then gradually display to the full brightness within the time threshold.

[0063] Preferably, the specific steps in performing step A4 are as follows:

[0064] Step A41: obtaining brightness values ​​of each point in the non-constantly bright area, constructing a first one-dimensional space vector, and constructing test data according to the first one-dimensional space vector;

[0065] Step A42: randomly setting the brightness value of each point after the brightness change, constructing a second one-dimensional space vector, and finding the maximum difference C between the first one-dimensional space vector and the second one-dimensional space vector;

[0066] Step A43: Find parameters greater than the maximum difference C in the test data, mark the first set, and obtain ratios Q of all parameters in the first set to the maximum difference C respectively;

[0067] Step A44: Calculate the logarithm of the comparison value Q, and then obtain the average value Z of all logarithms in the test data, wherein the formula for obtaining the average value Z is as follows:

[0068] Where n and k are integers, is the ratio of the kth parameter in the first set to the maximum difference, X1 is the number of parameters in the first set;

[0069] Step A45: Repeat steps A42 to A44 to obtain several average values ​​Z, find the minimum average value Z, and use the brightness values ​​of each point corresponding to the minimum average value Z as the target parameter for the brightness change in the next second.

[0070] In the display of HUD, the function is displayed as multiple light points that emit light and then project to form a corresponding shape, so when reducing the brightness, it is necessary to control multiple light points. In the present invention, the light points of non-long-bright functions are used to construct a first one-dimensional space vector. In one embodiment, the test data is the standard deviation of the first one-dimensional space vector data, multiplied by a control coefficient ratio, and the value of the control coefficient ratio is between 0.2 and 0.5. The specific training process of the control coefficient is not the focus of the present invention, so it will not be introduced in detail here.

[0071] Then, in the present invention, the brightness value of each point after the brightness change will be randomly set. For example, the overall brightness of all the current light-emitting points is 10 units, while the brightness of the environment is 5 units, and the time threshold is 5 seconds, that is, the brightness change rate V is 1, so after the next second, the overall brightness of all the light-emitting points needs to be 9 units. It is only necessary to randomly set the brightness of multiple light-emitting points in the non-long-brightness function so that the overall brightness meets 9 units. However, if the brightness value of each point after the brightness change is randomly set, the value of some points may directly become 0, which will still cause serious alternation of perception and cause adverse effects on the driver. For this reason, in the invention, the average value Z will also be calculated. The average value Z can effectively reflect the changes in the brightness of each point in the changed scheme and the brightness of each store in the current scheme. When the average value Z is smaller, it means that the trend of brightness change between the previous and next schemes is more stable, and the brightness change is smoother.

[0072] After performing multiple random schemes, a scheme with the minimum average value Z is obtained as the scheme for this brightness adjustment.

[0073] A backlight partition control system for a display device, using the backlight partition control method for a display device, comprising a first partitioning module, a second partitioning module, a setting module and a control module;

[0074] The first division module is used to divide the display device into a plurality of control areas, wherein the control area includes a long-bright area and a non-long-bright area;

[0075] The second division module is used to divide the functions on the display device into long-light functions and non-long-light functions according to the display logic of the functions;

[0076] The setting module is used to set the long-brightness function in the long-brightness area, and set the non-long-brightness function in the non-long-brightness area, wherein the long-brightness function in the long-brightness area is electrically connected to the switch, and the non-long-brightness area is electrically connected to the MCU;

[0077] The control module is used to control the non-long-light function in the non-long-light area to perform backlight display through the MCU when the display device receives the needs of the business scene. When the business scene disappears, the MCU controls the non-long-light function to be turned off.

[0078] Preferably, the control module includes a gradual change submodule;

[0079] The gradient submodule is used to call the MCU to record the duration of disappearance of the business scene. When the duration of disappearance is less than the time threshold, the brightness of the non-long-light function gradually dims. When the duration of disappearance is greater than the time threshold, the non-long-light function is turned off.

[0080] Preferably, the gradient submodule includes a brightness acquisition unit, a difference acquisition unit, a change acquisition unit and an execution unit;

[0081] The brightness acquisition unit is used to acquire the surrounding environment brightness information C1 and the brightness information C2 of the current non-constantly bright area;

[0082] The difference acquisition unit is used to obtain a brightness information difference ΔC according to the brightness information C1 and the brightness information C2;

[0083] The change acquisition unit is used to calculate the brightness change rate V according to the brightness information difference ΔC and the time threshold;

[0084] The execution unit is used to gradually reduce the brightness of the non-long-brightness function according to the brightness change rate V obtained by the calculation at the moment when the business scene disappears.

[0085] Preferably, the execution unit includes a construction subunit, a comparison subunit, a ratio subunit, a calculation subunit and a selection subunit;

[0086] The construction subunit is used to obtain the brightness value of each point in the non-constantly bright area, and construct a first one-dimensional space vector, and construct test data according to the first one-dimensional space vector;

[0087] The comparison subunit is used to randomly set the brightness value of each point after the brightness change, and construct a second one-dimensional space vector, and obtain the maximum difference C between the first one-dimensional space vector and the second one-dimensional space vector;

[0088] The ratio subunit is used to find parameters greater than the maximum difference C in the test data, mark the first set, and respectively obtain the ratios Q of all parameters in the first set to the maximum difference C;

[0089] The calculation subunit is used to calculate the logarithm of the comparison value Q, and then obtain the average value Z of all logarithms in the test data;

[0090] The selection subunit is used to re-call the comparison subunit, the ratio subunit and the calculation subunit to obtain several average values ​​Z, find the minimum average value Z, and use the brightness values ​​of each point corresponding to the minimum average value Z as the target parameter of the brightness change in the next second.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A backlight partition control method for a display device, characterized in that: The following steps are involved: Dividing the display device into a plurality of control areas, wherein the control areas include a long-brightness area and a non-long-brightness area; According to the display logic of the function, the functions on the display device are divided into long-light functions and non-long-light functions; The long-light function is set in the long-light area, and the non-long-light function is set in the non-long-light area, wherein the long-light function in the long-light area is electrically connected to the switch, and the non-long-light area is electrically connected to the MCU; When the display device receives the needs of the business scene, the MCU controls the non-constant light function in the non-constant light area to display the backlight. When the business scene disappears, the MCU controls the non-constant light function to turn off. When the business scene disappears, the MCU records the duration of the disappearance of the business scene. When the duration of disappearance is less than the time threshold, the brightness of the non-long-light function gradually dims. When the duration of disappearance is greater than the time threshold, the non-long-light function is turned off. The specific steps of gradually dimming the brightness of the non-constant light function are as follows: Step A1: Obtaining the surrounding environment brightness information C1 and the brightness information C2 of the current non-constantly bright area; Step A2: Obtain brightness information difference based on brightness information C1 and brightness information C2 ; Step A3: Based on the brightness information difference The brightness change rate V is calculated with the time threshold; Step A4: When the business scene disappears, the brightness of the non-constant light function is gradually reduced according to the brightness change rate V obtained by the calculation; The specific steps in executing step A4 are as follows: Step A41: obtaining brightness values ​​of each point in the non-constantly bright area, constructing a first one-dimensional space vector, and constructing test data according to the first one-dimensional space vector; Step A42: randomly setting the brightness value of each point after the brightness change, constructing a second one-dimensional space vector, and finding the maximum difference C between the first one-dimensional space vector and the second one-dimensional space vector; Step A43: Find parameters greater than the maximum difference C in the test data, mark the first set, and obtain ratios Q of all parameters in the first set to the maximum difference C respectively; Step A44: Calculate the logarithm of the comparison value Q, and then obtain the average value Z of all logarithms in the test data; Step A45: Repeat steps A42 to A44 to obtain several average values ​​Z, find the minimum average value Z, and use the brightness values ​​of each point corresponding to the minimum average value Z as the target parameter for the brightness change in the next second.

2. A backlight partition control system for a display device, using the backlight partition control method for a display device according to claim 1, characterized in that: It includes a first division module, a second division module, a setting module and a control module; The first division module is used to divide the display device into a plurality of control areas, wherein the control area includes a long-bright area and a non-long-bright area; The second division module is used to divide the functions on the display device into long-light functions and non-long-light functions according to the display logic of the functions; The setting module is used to set the long-brightness function in the long-brightness area, and set the non-long-brightness function in the non-long-brightness area, wherein the long-brightness function in the long-brightness area is electrically connected to the switch, and the non-long-brightness area is electrically connected to the MCU; The control module is used to control the non-long-light function in the non-long-light area to perform backlight display through the MCU when the display device receives the demand of the business scene. When the business scene disappears, the MCU controls the non-long-light function to turn off; The control module includes a gradual change submodule; The gradient submodule is used to call the MCU to record the duration of disappearance of the business scene. When the duration of disappearance is less than the time threshold, the brightness of the non-long-light function gradually dims. When the duration of disappearance is greater than the time threshold, the non-long-light function is turned off. The gradient submodule includes a brightness acquisition unit, a difference acquisition unit, a change acquisition unit and an execution unit; The brightness acquisition unit is used to acquire the surrounding environment brightness information C1 and the brightness information C2 of the current non-constantly bright area; The difference acquisition unit is used to obtain the brightness information difference according to the brightness information C1 and the brightness information C2 ; The change acquisition unit is used to obtain the brightness information difference according to the brightness information difference. The brightness change rate V is calculated with the time threshold; The execution unit is used to gradually reduce the brightness of the non-constant light function at the brightness change rate V obtained by the calculation at the moment when the business scene disappears; The execution unit includes a construction subunit, a comparison subunit, a ratio subunit, a calculation subunit and a selection subunit; The construction subunit is used to obtain the brightness value of each point in the non-constantly bright area, and construct a first one-dimensional space vector, and construct test data according to the first one-dimensional space vector; The comparison subunit is used to randomly set the brightness value of each point after the brightness change, and construct a second one-dimensional space vector, and obtain the maximum difference C between the first one-dimensional space vector and the second one-dimensional space vector; The ratio subunit is used to find parameters greater than the maximum difference C in the test data, mark the first set, and respectively obtain the ratios Q of all parameters in the first set to the maximum difference C; The calculation subunit is used to calculate the logarithm of the comparison value Q, and then obtain the average value Z of all logarithms in the test data; The selection subunit is used to re-call the comparison subunit, the ratio subunit and the calculation subunit to obtain several average values ​​Z, find the minimum average value Z, and use the brightness values ​​of each point corresponding to the minimum average value Z as the target parameter of the brightness change in the next second.

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