COB Small Pitch LED Display Electro-Optical Conversion Control Method, System and Storage Medium

Abstract

The present invention discloses a method, system and storage medium for electro-optical conversion control of a COB small-pitch LED display screen. The method includes collecting a video signal of an external device, decoding, scaling and color correction processing the video signal through a video processor to generate video data; generating a control instruction, generating display data for controlling the operation of the LED display screen according to the control instruction and the video data; scanning the display data and driving the LED display screen to emit light; calculating a user comfort coefficient, collecting the operating temperature of the LED display screen, and calculating a target PWM duty ratio according to the operating temperature of the LED display screen and the user comfort coefficient; controlling the LED display screen to smoothly adjust from the current PWM duty ratio to the target PWM duty ratio to adjust the display brightness of the LED display screen. The present invention can intelligently adjust the display brightness of the LED display screen, improving the user experience while reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of LED display control, and in particular to a COB small-pitch LED display electro-optical conversion control method, system and storage medium. Background Art

[0002] In the existing COB small-pitch LED display technology, the performance of the electro-optical conversion control system directly affects the image quality, response speed and user experience of the display. The traditional control system usually consists of a signal processing unit, a main control unit, a driving circuit and other parts, which work independently and lack an effective linkage mechanism. For example, the brightness adjustment of the LED display is simply adjusted according to experience, and the display brightness of the LED display cannot be accurately controlled, resulting in problems such as high energy consumption and poor user experience. Summary of the Invention

[0003] In order to solve at least one of the above-mentioned technical problems, the present invention provides a COB small-pitch LED display electro-optical conversion control method, system and storage medium.

[0004] In a first aspect, the present invention provides a COB small-pitch LED display electro-optical conversion control method, the method comprising:

[0005] Collecting a video signal of an external device, and performing decoding, scaling and color correction processing on the video signal through a video processor to generate video data;

[0006] Generating a control instruction, and generating display data for controlling the operation of the LED display according to the control instruction and the video data;

[0007] Scanning the display data and driving the LED display to emit light;

[0008] Calculating a user comfort coefficient, and collecting the operating temperature of the LED display, and calculating a target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient;

[0009] Controlling the LED display to smoothly adjust from the current PWM duty cycle to the target PWM duty cycle to adjust the display brightness of the LED display.

[0010] Preferably, the calculating the target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient includes:

[0011] Calculating the electro-optical conversion efficiency of the LED display:

[0012]

[0013] Wherein, E(T) represents the electro-optical conversion efficiency of the LED display screen at the current temperature T, and T ref represents the reference temperature when the LED display screen is working normally, and E(T ref ) represents the electro-optical conversion efficiency of the LED display screen at the reference temperature, α represents the temperature sensitivity coefficient, and e is the natural constant;

[0014] Determine the heat dissipation efficiency of the LED display screen:

[0015] H(T)=H(T ref )·(1 - β(T - T ref ));

[0016] Wherein, H(T) represents the heat dissipation efficiency of the LED display screen at the current temperature T, and H(T ref ) represents the heat dissipation efficiency of the LED display screen at the reference temperature T ref , and β represents the heat dissipation coefficient;

[0017] Determine the target PWM duty cycle:

[0018]

[0019] Wherein, D g represents the target PWM duty cycle, D b represents the preset PWM duty cycle reference value, T max is the maximum allowable temperature for the LED display screen to work, and γ is the user comfort coefficient.

[0020] Preferably, the calculation formula for the user comfort coefficient γ is:

[0021]

[0022] Wherein, C L represents the user's comfort with the brightness L, L is the current brightness of the LED display screen, and L ef is the reference brightness, and k is a proportionality constant with a value range of 0 < k < 1.

[0023] Preferably, after calculating the target PWM duty cycle according to the working temperature of the LED display screen and the user comfort coefficient, the method further includes:

[0024] Obtain user behavior data, identify the user's presence status and direction from the user behavior data, and determine the number of people not watching the LED display screen;

[0025] Judge whether the number of people not watching the LED display screen exceeds a preset threshold, and adaptively adjust the size of the target PWM duty cycle when it exceeds the preset threshold.

[0026] Preferably, after calculating the target PWM duty cycle according to the operating temperature of the LED display screen and the user comfort coefficient, the method further includes:

[0027] Collect the ambient light intensity, calculate the ambient light compensation factor according to the ambient light intensity, and compensate the target PWM duty cycle according to the ambient light compensation factor. Specifically:

[0028] D g * = fD g +(1 - f)μD g ;

[0029]

[0030] In the formula, D g * , D g respectively represent the target PWM duty cycle after compensation and before compensation, f represents the adjustment coefficient, satisfying 0 < f < 1; μ represents the ambient light compensation factor, Q g represents the ideal ambient light intensity, Q c represents the collected ambient light intensity, and e is the natural constant.

[0031] Preferably, controlling the LED display screen to smoothly adjust from the current PWM duty cycle to the target PWM duty cycle includes:

[0032] Calculate the PWM duty cycle increment per step:

[0033]

[0034] In the formula, ΔD s represents the PWM duty cycle increment per step, D g represents the target PWM duty cycle, D c represents the current PWM duty cycle, N / t is the total number of steps, indicating the number of adjustments at intervals of t within the transition time N;

[0035] According to the PWM duty cycle increment, gradually and smoothly adjust the duty cycle within each time interval t:

[0036] D v = D c + m·ΔD s ;

[0037] In the formula, D v is the PWM duty cycle after each step of adjustment, and m represents the step number, starting from 0.

[0038] Second aspect, the present invention further provides a COB small-pitch LED display electro-optical conversion control system, which is applicable to the electro-optical conversion control method described in any item of the first aspect. The system includes:

[0039] A signal processing module, configured to collect video signals of an external device, decode, scale, and perform color correction processing on the video signals through a video processor to generate video data;

[0040] An MCU main control module, configured to generate control instructions, and generate display data for controlling the operation of the LED display according to the control instructions and the video data;

[0041] A driving circuit module, configured to scan the display data and drive the LED display to emit light;

[0042] An environment monitoring module, configured to collect the operating temperature of the LED display and send it to the MCU main control module, so that the MCU main control module calculates the target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient;

[0043] A PWM dimming module, configured to control the LED display to smoothly adjust from the current PWM duty cycle to the target PWM duty cycle to adjust the display brightness of the LED display.

[0044] Third aspect, the present invention further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of an electro-optical conversion control method for a COB small-pitch LED display described in any item of the first aspect are implemented.

[0045] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0046] The present invention provides a method for controlling the electro-optical conversion of a COB small-pitch LED display screen. The method includes collecting a video signal of an external device, decoding, scaling, and color-correcting the video signal through a video processor to generate video data; generating control instructions, and generating display data for controlling the operation of the LED display screen according to the control instructions and the video data; scanning the display data and driving the LED display screen to emit light; calculating a user comfort coefficient, collecting the operating temperature of the LED display screen, and calculating a target PWM duty ratio according to the operating temperature of the LED display screen and the user comfort coefficient; controlling the LED display screen to smoothly adjust from the current PWM duty ratio to the target PWM duty ratio to adjust the display brightness of the LED display screen. By monitoring the operating temperature of the LED display screen and the user behavior, the present invention intelligently adjusts the PWM duty ratio to ensure that the LED operates within a safe temperature range, and at the same time optimizes the display brightness according to the user's behavior data to improve the viewing comfort. By considering the ambient light intensity, the PWM duty ratio is compensated, improving the accuracy of the target PWM duty ratio, and capable of greatly enhancing the user's movie viewing experience while reducing the energy consumption of the LED display screen.

[0047] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the background art, the following will describe the drawings required to be used in the embodiments of the present invention or the background art.

[0049] The drawings herein are incorporated into the specification and form a part of this specification. These drawings illustrate embodiments consistent with the present disclosure and, together with the specification, are used to explain the technical solutions of the present disclosure.

[0050] Figure 1 It is a schematic flowchart of a method for controlling the electro-optical conversion of a COB small-pitch LED display screen provided by an embodiment of the present invention;

[0051] Figure 2 It is a schematic structural diagram of a system for controlling the electro-optical conversion of a COB small-pitch LED display screen provided by an embodiment of the present invention;

[0052] Figure 3 For Figure 2 It is a schematic structural diagram of the environmental monitoring module 400 in DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] To enable those skilled in the art to better understand the solution of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0054] Reference herein to "embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0055] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an electro-optical conversion control method for a COB small-pitch LED display screen provided by an embodiment of the present invention. As Figure 1 shown, the method includes:

[0056] S10. Collect the video signal of an external device, and perform decoding, scaling, and color correction processing on the video signal through a video processor to generate video data.

[0057] Use a video capture card or an input interface integrated in the video processor, such as HDMI, VGA, etc., to receive the video signal from an external device such as a computer, a player, etc. Usually, the received signal is a compressed and encoded video signal. Therefore, it is necessary to decode it through a decoding chip or a software algorithm and convert it into the original image data format. Further, perform scaling processing on the original image data to make it adapt to the resolution of the LED display screen. This can be achieved through an interpolation algorithm. Then, perform color correction to ensure that the finally displayed color meets the required standard.

[0058] S20. Generate a control instruction, and generate display data for controlling the operation of the LED display screen according to the control instruction and the video data.

[0059] The main control module generates corresponding control instructions according to a preset display mode or the operation of the user, such as changing the display content, adjusting the brightness, etc. According to the control instruction and the processed video data, generate a data format suitable for the LED display screen to display, usually a data stream in units of pixels.

[0060] S30. Scan the display data and drive the LED display screen to emit light.

[0061] The generated display data is scanned and output line by line according to the refresh frequency of the LED display screen to ensure that each frame of the image can be completely displayed. The display data is converted into current or voltage signals required by the LED units through the driving IC to control the LED emission.

[0062] S40. Calculate the user comfort coefficient, collect the operating temperature of the LED display screen, and calculate the target PWM duty cycle according to the operating temperature of the LED display screen and the user comfort coefficient;

[0063] The user comfort coefficient is usually related to the brightness comfort of the user when viewing the LED display screen and the LED display and the reference brightness. According to these parameters, a suitable user comfort coefficient can be calculated. The operating temperature of the LED display screen can be monitored in real time using a temperature sensor. Combining the user comfort coefficient and the current operating temperature, an appropriate target PWM duty cycle can be calculated through constructing an algorithm model to adjust the overall brightness of the LED display screen.

[0064] S50. Control the LED display screen to smoothly adjust from the current PWM duty cycle to the target PWM duty cycle to adjust the display brightness of the LED display screen.

[0065] By gradually changing the duty cycle of the PWM signal, the brightness of the LED display screen smoothly transitions from the current value to the target value, avoiding discomfort caused to the user by sudden brightness changes.

[0066] Therefore, in this embodiment, by monitoring the operating temperature of the LED display screen and the user comfort coefficient, the PWM duty cycle is intelligently adjusted to ensure that the LED operates within a safe temperature range. At the same time, the display brightness is optimized according to the user comfort coefficient to improve the viewing comfort, and the energy consumption of the LED display screen can be reduced while greatly enhancing the user's movie viewing experience.

[0067] In one embodiment, the calculating the target PWM duty cycle according to the operating temperature of the LED display screen and the user comfort coefficient includes:

[0068] Calculate the electro-optical conversion efficiency of the LED display screen:

[0069]

[0070] In the formula, E(T) represents the electro-optical conversion efficiency of the LED display screen when the current temperature is T, T ref represents the reference temperature when the LED display screen operates normally, E(T ref ) represents the electro-optical conversion efficiency of the LED display screen at the reference temperature, α represents the temperature sensitivity coefficient, e is the natural constant, which is an infinite non-repeating decimal and a transcendental number, and its value is usually 2.718281828459045;

[0071] Determine the heat dissipation efficiency of the LED display screen:

[0072] H(T) = H(T ref )·(1 - β(T - T ref ));

[0073] In the formula, H(T) represents the heat dissipation efficiency of the LED display screen at the current temperature T, and H(T ref ) represents the heat dissipation efficiency of the LED display screen at the reference temperature T ref , and β represents the heat dissipation coefficient.

[0074] The heat dissipation coefficient of the LED display screen is an important parameter, which directly affects the working stability and lifespan of the LED display screen. The heat dissipation coefficient is usually characterized by the thermal conductivity index, and the thermal conductivity is usually related to materials, such as the substrate materials (such as aluminum, copper, etc.), encapsulation materials, and thermal conductivities of other internal components used in the LED display screen. The thermal conductivity data of these materials can be obtained from suppliers.

[0075] Determine the target PWM duty cycle:

[0076]

[0077] In the formula, D g represents the target PWM duty cycle, D b represents the preset PWM duty cycle reference value, T max is the maximum allowable temperature at which the LED display screen operates, and γ is the user comfort coefficient.

[0078] Preferably, the calculation formula for the user comfort coefficient is:

[0079]

[0080] In the formula, C L represents the user's comfort with the brightness L, L is the current brightness of the LED display screen, L ref is the reference brightness, and k is a proportionality constant with a value range of 0 < k < 1.

[0081] It should be noted that the calculation formula of the electro - optical conversion efficiency E(T) of the LED display screen shows that the electro - optical conversion efficiency of the LED display screen decreases with the increase in temperature. The electro - optical conversion efficiency refers to the efficiency of converting input electrical energy into light energy. When the temperature is higher than the reference temperature T refWhen this occurs, the photoelectric conversion efficiency E(T) will decrease exponentially. Here, α is a temperature sensitivity coefficient, reflecting the degree of influence of temperature change on the conversion efficiency. The calculation formula for the heat dissipation efficiency H(T) indicates that as the temperature rises, the heat dissipation capacity of the LED display will also decrease. The heat dissipation efficiency determines whether the LED display can effectively remove heat and maintain within the optimal operating temperature range. β is a heat dissipation coefficient, representing the influence of temperature change on the heat dissipation efficiency. At the target PWM duty cycle D g In the calculation formula of g the target PWM duty cycle D b is calculated based on the preset reference value D g , combined with the electro-optical conversion efficiency E(T), heat dissipation efficiency H(T) at the current temperature, and a coefficient γ reflecting the user's comfort. In addition, T max in the calculation formula of D

[0082] represents the maximum allowable operating temperature of the LED display. When the temperature approaches the maximum allowable temperature, the PWM duty cycle will be adjusted lower to prevent overheating. ref Assume the reference temperature T max = 25°C, E(25°C) = 70%, H(25°C) = 90%, the highest allowable temperature T b = 80%, the temperature sensitivity coefficient α = 0.01, the heat dissipation coefficient β = 0.005, and the user comfort coefficient γ = 2. Substituting these values into the formula, we can get:

[0083] E(60°C) = E(25°C)·e -0.01(60-25) = 70%e -0.35 ≈ 70.44%;

[0084] H(60°C) = H(25°C)·(1 - β(60 - 25)) = 90%(1 - 0.175) ≈ 70.25%;

[0085] Next, substituting E(60°C) and H(60°C) into the formula of D g we can get:

[0086]

[0087] Therefore, the target PWM duty cycle can be obtained as 53%. At this time, the current PWM duty cycle needs to be smoothly adjusted to the target PWM duty cycle of 53% to ensure that the LED display can adapt to the temperature environment, meet the user's needs, and reduce the operating energy consumption.

[0088] In this embodiment, the influence of temperature on the electro-optical conversion efficiency and heat dissipation efficiency is considered. It can automatically adjust the PWM duty cycle at different ambient temperatures to maintain the best display state of the LED display screen and prevent performance degradation caused by overheating. By introducing a user comfort coefficient, the display brightness can be adjusted according to the actual usage situation of the user, making the display effect more in line with the user's visual habits and enhancing the viewing experience. Through the intelligent adjustment of the PWM duty cycle, unnecessary energy consumption can be reduced while meeting the display effect, and the service life of the LED display screen can be extended.

[0089] In one embodiment, after calculating the target PWM duty cycle according to the operating temperature of the LED display screen and the user comfort coefficient, the method further includes:

[0090] Obtain user behavior data, identify the user presence status and direction from the user behavior data, and determine the number of people not watching the LED display screen;

[0091] Judge whether the number of people not watching the LED display screen exceeds a preset threshold, and adaptively adjust the size of the target PWM duty cycle when it exceeds the preset threshold.

[0092] In order to make the system more intelligent and responsive, a non-linear function can be designed to better reflect the influence of the change in the number of viewers on the brightness. In this embodiment, an exponential decay function is mainly introduced, so that when the number of people not watching exceeds the threshold, the brightness drops faster, and when approaching the threshold, the brightness change becomes more gentle.

[0093] Specifically, the PWM duty cycle D after adaptive adjustment g， is:

[0094]

[0095] In the formula, j is a constant, satisfying used to represent the speed at which the PWM duty cycle decreases when one more person not watching is added, D max represents the maximum PWM duty cycle, D g′ satisfies being greater than the minimum PWM duty cycle D min ; Z1 and Z0 respectively represent the number of people not watching the LED display screen and the preset threshold. In this way, the brightness can be flexibly adjusted through this algorithm to adapt to the change in the number of viewers, and the viewer experience can also be optimized by adjusting the parameters.

[0096] In one embodiment, after calculating the target PWM duty cycle according to the operating temperature of the LED display screen and the user comfort coefficient, it further includes:

[0097] Collect the ambient light intensity, calculate the ambient light compensation factor based on the ambient light intensity, and compensate the target PWM duty cycle according to the ambient light compensation factor. Specifically:

[0098] D g * = fD g +(1 - f)μD g ;

[0099] In the formula, D g * and D g respectively represent the target PWM duty cycle after compensation and before compensation. f represents the adjustment coefficient, satisfying 0 < f < 1; μ represents the ambient light compensation factor, and its calculation formula is The value range is 0 < μ < 1, Q g represents the ideal ambient light intensity, Q c represents the collected ambient light intensity, and e is the natural constant.

[0100] In this embodiment, f in the calculation formula of the target PWM duty cycle D g * after compensation is an adjustment coefficient, which determines the weights of the original duty cycle D g and the duty cycle μD after compensation g in the final result. When f is close to 1, the duty cycle D g * after compensation depends more on the original duty cycle D g ; when f is close to 0, D g * depends more on the duty cycle μD adjusted by the ambient light intensity g .

[0101] When the ambient light intensity Q c is low, the value of μ will be close to 1, which means that the screen brightness will not change significantly, and may even increase slightly to ensure that the content is still clearly visible in a dim environment. When the ambient light intensity Q c is high, the value of μ will be less than 1, which will cause the screen brightness to decrease to reduce energy consumption and reduce the reflection of the screen in strong light. Due to the existence of f, the change of the PWM duty cycle will be gradual rather than abrupt, which helps to provide a better user experience and avoid eye discomfort caused by rapid brightness changes.

[0102] In one embodiment, the PWM dimming module 500 is used to smoothly adjust the current PWM duty cycle to the target PWM duty cycle, including:

[0103] Calculate the PWM duty cycle increment per step:

[0104]

[0105] Wherein, ΔD s represents the PWM duty cycle increment per step, D g represents the target PWM duty cycle, D c represents the current PWM duty cycle, N / t is the total number of steps, indicating the number of adjustments made at intervals of t during the transition time N;

[0106] According to the PWM duty cycle increment, the duty cycle is gradually and smoothly adjusted within each time interval t:

[0107] D v = D c + m·ΔD s ;

[0108] Wherein, D v is the PWM duty cycle after each step of adjustment, m represents the step number, starting from 0.

[0109] Through this embodiment, the PWM duty cycle will smoothly transition from the current value D c to the target value D g within a specified time period N with a certain step size t.

[0110] In this embodiment, since the PWM duty cycle changes gradually rather than instantaneously, the flickering phenomenon caused by sudden changes can be avoided. The smooth transition enables users not to feel obvious brightness mutations during viewing, improving visual comfort. By setting different N and t, the transition speed can be flexibly controlled to adapt to different application scenarios. Since the increment of each step is fixed, the entire transition process is predictable, facilitating debugging and optimization.

[0111] In summary, the present invention intelligently adjusts the PWM duty cycle by monitoring the operating temperature of the LED display screen and user behavior to ensure that the LED operates within a safe temperature range, and at the same time optimizes the display brightness according to the user's behavior data to improve viewing comfort. By considering the ambient light intensity, the PWM duty cycle is compensated, improving the accuracy of the target PWM duty cycle, and capable of greatly enhancing the user's movie-watching experience while reducing the energy consumption of the LED display screen.

[0112] Please refer to Figure 2 , a certain embodiment of the present invention also provides a COB small-pitch LED display screen electro-optical conversion control system, applicable to the electro-optical conversion control method described in any one of the above embodiments. As Figure 2 shown, this control system includes the following modules:

[0113] The signal processing module 100 is used to collect the video signals of external devices, and decode, scale, and color-correct the video signals through a video processor to generate video data.

[0114] The MCU main control module 200 is used to generate control instructions, and generate display data for controlling the operation of the LED display according to the control instructions and the video data.

[0115] The driving circuit module 300 is used to scan the display data and drive the LED display to emit light.

[0116] The environmental monitoring module 400 is used to collect the operating temperature of the LED display and send it to the MCU main control module, so that the MCU main control module calculates the target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient.

[0117] The PWM dimming module 500 is used to control the LED display to smoothly adjust from the current PWM duty cycle to the target PWM duty cycle to adjust the display brightness of the LED display.

[0118] In this embodiment, a video capture card or an input interface integrated in the video processor, such as HDMI, VGA, etc., is used to receive video signals from external devices such as computers and players. Usually, the signals received by the signal processing module 100 are compressed and encoded video signals. Therefore, the signal processing module 100 will decode them through a decoding chip or a software algorithm and convert them into the original image data format. Further, the original image data is scaled to adapt to the resolution of the LED display. This can be achieved through an interpolation algorithm. Then, the color is corrected to ensure that the finally displayed color meets the required standards and ensure the accuracy and consistency of the color. The whole process is to generate video data suitable for display on the LED display.

[0119] The MCU main control module 200, as the brain of the system, is responsible for receiving the video data from the signal processing module 100, generating corresponding control instructions according to the preset display mode or the user's operation, such as changing the display content, adjusting the brightness, etc. According to the control instructions and the processed video data, it generates a data format suitable for display on the LED display, usually a data stream in units of pixels. In addition, it will calculate the target PWM duty cycle according to the information fed back by the environmental monitoring module 400 and send the corresponding display data and control instructions to the driving circuit module 300.

[0120] The function of the driving circuit module 300 is to convert the display data generated by the MCU main control module 200 into the actual display on the LED display screen. Specifically, the driving circuit module 300 is used to scan and output the generated display data line by line according to the refresh frequency of the LED display screen, ensuring that each frame of image can be completely displayed. The display data is converted into the current or voltage signal required by the LED unit through the driving IC to control the LED to emit light.

[0121] The environmental monitoring module 400 is used to collect the working environment data of the LED display screen, including but not limited to the working temperature of the LED display screen, and user behavior data such as the number of people watching and not watching the LED display screen. These data will be transmitted to the MCU main control module 200. The MCU main control module 200 will calculate a suitable user comfort coefficient based on the collected data according to the brightness comfort level of the user watching the LED display screen and the calculation of the LED display and the reference brightness. The working temperature of the LED display screen can be monitored in real time using a temperature sensor. Finally, the MCU main control module 200 calculates the target PWM duty cycle by combining the user comfort coefficient and the current working temperature, that is, determines the target value of the LED brightness adjustment.

[0122] The PWM dimming module 500 is responsible for adjusting the brightness of the LED display screen. After the MCU main control module 200 determines the target PWM duty cycle, the PWM dimming module 500 will gradually adjust the current PWM duty cycle to the target value to achieve smooth brightness adjustment. This can avoid the visual discomfort caused by sudden brightness changes and can better adapt to environmental changes, such as changes in light intensity.

[0123] See Figure 3, in one embodiment, the environmental monitoring module 400 includes a temperature sensor 401, a camera 402, and an ambient light sensor 403, which are respectively used to collect the operating temperature of the LED display screen, user behavior data, and ambient light intensity. By monitoring the temperature of the display screen through the temperature sensor 401, the system can determine whether the display screen is in an overheated state and adjust the PWM duty cycle accordingly to reduce the brightness, thereby preventing overheating damage to the display screen. In addition, the data of the temperature sensor 401 can also be used to calculate the electro-optical conversion efficiency and heat dissipation efficiency to achieve more precise brightness control. Using the data captured by the camera 402, the system can calculate the user comfort coefficient. For example, if it is detected that the user is close to the display screen to watch, the brightness may need to be reduced to reduce eye fatigue; on the contrary, if the user is far away, the brightness may be appropriately increased to ensure clarity. In addition, the camera 402 can also be used to detect the number of viewers and activity patterns to dynamically adjust the display content and brightness. By sensing the ambient light intensity through the ambient light sensor 403, the system can automatically adjust the brightness of the display screen to maintain the best visual effect under different lighting conditions. For example, in a bright environment, the system may increase the brightness to overcome the interference of ambient light; while in a dim environment, the brightness will be reduced to avoid glare.

[0124] Therefore, an electro-optical conversion control system for a COB small-pitch LED display screen provided in this embodiment can intelligently adjust the PWM duty cycle by monitoring the operating temperature and user behavior of the LED display screen to ensure that the LED operates within a safe temperature range. At the same time, it can optimize the display brightness according to the user's behavior data, improve the viewing comfort, and greatly enhance the user's movie-watching experience while reducing the energy consumption of the LED display screen.

[0125] One embodiment of the present invention also provides a computer-readable storage medium, in which a computer program is stored. The computer program includes program instructions. When the program instructions are executed by a processor of an electronic device, the processor is caused to execute an electro-optical conversion control method for a COB small-pitch LED display screen as described in any one of the above embodiments.

[0126] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0127] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein. Those skilled in the art can also clearly understand that each embodiment of the present invention has different emphases in description. For the convenience and brevity of description, the same or similar parts may not be elaborated in different embodiments. Therefore, the parts not described or not described in detail in a certain embodiment can refer to the descriptions in other embodiments.

[0128] In several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0129] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0130] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains one or more available media integrated. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a digital versatile disc (DVD)), or a semiconductor medium (for example, a solid state disk (SSD)), etc.

[0131] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by relevant hardware instructed by a computer program. This program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The foregoing storage medium includes various media that can store program codes, such as read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs.

Claims

1. A method for controlling the electro-optical conversion of a COB small-pitch LED display, characterized in that, The method includes: Collecting the video signal of an external device, and performing decoding, scaling, and color correction processing on the video signal through a video processor to generate video data; Generating control instructions, and generating display data for controlling the operation of the LED display according to the control instructions and the video data; Scanning the display data and driving the LED display to emit light; Calculating the user comfort coefficient, collecting the operating temperature of the LED display, and calculating the target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient; The calculating the target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient includes: Calculating the electro-optical conversion efficiency of the LED display: ； In the formula, represents the electro-optical conversion efficiency of the LED display screen at the current temperature of ; represents the reference temperature when the LED display screen is operating normally, represents the electro-optical conversion efficiency of the LED display screen at the reference temperature, represents the temperature sensitivity coefficient, is the natural constant; Determining the heat dissipation efficiency of the LED display: ； In the formula, represents the heat dissipation efficiency of the LED display screen at the current temperature of , represents the heat dissipation efficiency of the LED display screen at the reference temperature , represents the heat dissipation coefficient; Determining the target PWM duty cycle: ； Wherein, represents the target PWM duty cycle, represents the preset reference value of the PWM duty cycle, is the maximum allowable temperature for the LED display to work, is the user comfort coefficient; The user comfort coefficient The calculation formula is as follows: ； In the formula, represents the comfort level of the user with respect to the brightness , is the brightness of the current LED display screen, is the reference brightness, is a proportionality constant, and its value range is ; After calculating the target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient, it further includes: Collecting the ambient light intensity, calculating the ambient light compensation factor according to the ambient light intensity, and compensating the target PWM duty cycle according to the ambient light compensation factor. Specifically: ； ； In the formula, and represent the target PWM duty cycles after and before compensation respectively, represents the adjustment coefficient, satisfying ; represents the ambient light compensation factor, represents the ideal ambient light intensity, represents the collected ambient light intensity, is the natural constant; Controlling the LED display to smoothly adjust from the current PWM duty cycle to the target PWM duty cycle to adjust the display brightness of the LED display.

2. The electro-optical conversion control method for COB small-pitch LED display screen according to claim 1, wherein After calculating the target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient, the method further includes: Obtaining user behavior data, identifying the user presence status and direction from the user behavior data, and determining the number of people not watching the LED display; Judging whether the number of people not watching the LED display exceeds a preset threshold, and adaptively adjusting the size of the target PWM duty cycle when it exceeds the preset threshold.

3. The electro-optical conversion control method of the COB small-pitch LED display according to claim 1, characterized in that The controlling the LED display to smoothly adjust from the current PWM duty cycle to the target PWM duty cycle includes: Calculating the PWM duty cycle increment for each step: ； Wherein, represents the PWM duty cycle increment per step, represents the target PWM duty cycle, represents the current PWM duty cycle, is the total number of steps, indicating the number of times of adjustment according to the time interval during the transition time ; Gradually and smoothly adjust the duty cycle step by step according to the PWM duty cycle increment within each time interval : ； Wherein, is the PWM duty cycle after each adjustment, represents the step number, starting from 0 for counting.

4. A COB small pitch LED display electro-optical conversion control system, applicable to the electro-optical conversion control method described in any one of claims 1 to 3, characterized in that, The system includes: A signal processing module for collecting the video signal of an external device, and performing decoding, scaling, and color correction processing on the video signal through a video processor to generate video data; An MCU main control module for generating control instructions, and generating display data for controlling the operation of the LED display according to the control instructions and the video data; A driving circuit module for scanning the display data and driving the LED display to emit light; An environment monitoring module for collecting the operating temperature of the LED display and sending it to the MCU main control module, so that the MCU main control module calculates the target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient; The calculating the target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient includes: Calculating the electro-optical conversion efficiency of the LED display: ； In the formula, represents the electro-optical conversion efficiency of the LED display screen at the current temperature of ; represents the reference temperature when the LED display screen operates normally, represents the electro-optical conversion efficiency of the LED display screen at the reference temperature, represents the temperature sensitivity coefficient, is the natural constant; Determining the heat dissipation efficiency of the LED display: ； In the formula, represents the heat dissipation efficiency of the LED display screen at the current temperature of , represents the heat dissipation efficiency of the LED display screen at the reference temperature of , represents the heat dissipation coefficient; Determining the target PWM duty cycle: ； In the formula, represents the target PWM duty cycle, represents the preset PWM duty cycle reference value, is the maximum allowable temperature for the LED display to work, is the user comfort coefficient; The user comfort coefficient The calculation formula is as follows: ； In the formula, represents the user's comfort level with respect to brightness , is the brightness of the current LED display screen, is the reference brightness, is a proportionality constant, and its value range is ; After calculating the target PWM duty cycle according to the operating temperature of the LED display and the user comfort coefficient, it further includes: Collecting the ambient light intensity, calculating the ambient light compensation factor according to the ambient light intensity, and compensating the target PWM duty cycle according to the ambient light compensation factor. Specifically: ； ； In the formula, and represent the target PWM duty cycles after and before compensation respectively, represents the adjustment coefficient, satisfying ; represents the ambient light compensation factor, represents the ideal ambient light intensity, represents the collected ambient light intensity, is the natural constant; The PWM dimming module is used to control the LED display screen to smoothly adjust from the current PWM duty cycle to the target PWM duty cycle, so as to adjust the display brightness of the LED display screen.

5. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of an electro-optical conversion control method for a COB small-pitch LED display screen according to any one of claims 1 to 3.

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