A method for adjusting stroboscopic frequency of an organic electroluminescent display panel

Abstract

A method for adjusting the stroboscopic frequency of an organic electroluminescent display panel includes: obtaining a variation curve of panel brightness based on a photosensitive sensor; transmitting the variation curve to a main control system, performing frequency analysis on brightness fluctuation data through an FFT algorithm, and extracting the stroboscopic frequency that causes visual fatigue; adjusting the driving circuit of the organic electroluminescent panel based on the frequency analysis result; optimizing the brightness adjustment algorithm based on the brightness fluctuation condition, and using linear brightness adjustment to control the brightness change rate; feeding back the adjusted driving signal to the photosensitive sensor, and continuously monitoring the stroboscopic frequency change; detecting the surrounding light intensity and ambient light frequency through a sensor, and combining the user's preference for brightness, intelligently selecting the best stroboscopic frequency suppression strategy. The present invention accurately detects the source of stroboscopic frequency through monitoring and analysis, and timely adjusts the drive circuit parameters. By optimizing the algorithm and brightness control, the stroboscopic phenomenon caused by low-frequency PWM is reduced, and the visual comfort of the display is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of stroboscopic adjustment, and in particular relates to a stroboscopic adjustment method for an organic electroluminescent display panel. Background Art

[0002] Although OLED technology has excellent display performance, such as high contrast, wide color gamut and fast response time, the flicker problem still exists during the dimming process and will have a negative impact on the user's visual experience.

[0003] OLED displays usually adjust brightness through pulse width modulation (PWM). PWM controls panel brightness by quickly switching current on and off. The frequency is high at high brightness, but the frequency tends to decrease at low brightness. This low-frequency PWM may produce flickering that is visible to the human eye. At low brightness settings, the frequency of PWM is low, and the flickering is more obvious, especially when viewing the display in a dark environment. This is particularly troublesome when reading, browsing the web, or using the device at night, and long-term use may cause damage to the user's eyes. If the frequency of PWM is too low, the human eye can easily perceive flickering; if the frequency is too high, although the flickering phenomenon can be reduced, it will cause the panel's power consumption to increase, heat up seriously, and even affect the life of the OLED panel. Therefore, how to strike a balance between reducing flickering and maintaining low power consumption is a technical challenge. Under certain lighting conditions, OLED displays may produce a frequency superposition effect with ambient light sources (such as fluorescent lamps, LED lamps, etc.). In particular, when the ambient light frequency is close to the display panel drive frequency, the flickering phenomenon will be more obvious. This interference is particularly prominent in environments with many light flicker sources such as offices and shopping malls. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above or existing problems of the stroboscopic adjustment method of the organic electroluminescent display panel, the present invention is proposed.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] The embodiment of the present invention provides a method for adjusting the stroboscopic frequency of an organic electroluminescent display panel, comprising: obtaining a variation curve of panel brightness based on a photosensitive sensor;

[0008] The change curve is transmitted to the main control system, and the brightness fluctuation data is subjected to frequency analysis through the FFT algorithm to extract the stroboscopic frequency that causes visual fatigue. The brightness fluctuation signal in the time domain is converted to the frequency domain through the FFT algorithm to obtain its spectrum information. FFT converts a set of time series data into frequency components and displays the amplitudes of different frequency components in the signal. The FFT algorithm expression is as follows:

[0009]

[0010] Where x(n) is the brightness time series, X(k) is the complex value in the frequency domain, k is the frequency index, n is the index of the nth sampling point of the time domain signal, j is the imaginary unit, and N is the total number of sampling points;

[0011] Extract the main peaks in the spectrum to determine whether there is a stroboscopic frequency. If the stroboscopic frequency is between 30-80Hz and has a large amplitude, it can be determined to be the frequency that causes visual fatigue.

[0012] Based on the frequency analysis results, adjust the driving circuit of the organic electroluminescent panel. If the FFT analysis shows that the stroboscopic frequency is between 30-50Hz, adjust the PWM frequency of the driving circuit to 400Hz; if the FFT analysis shows that the stroboscopic frequency is between 50-60Hz, adjust the PWM frequency of the driving circuit to 500Hz; if the FFT analysis shows that the stroboscopic frequency is between 60-80Hz, adjust the PWM frequency of the driving circuit to 600Hz; and further observe the stroboscopic condition of the panel. If the stroboscopic analysis shows that the brightness fluctuation amplitude is large by adjusting the PWM frequency of the driving circuit, fine-tune the driving voltage to make the panel work in a more stable voltage range to reduce the stroboscopic phenomenon; if the PWM frequency of the driving circuit is adjusted to 400Hz, adjust the driving voltage to 4.8V; if the PWM frequency of the driving circuit is adjusted to 500Hz, adjust the driving voltage to 4.4V; if the PWM frequency of the driving circuit is adjusted to 600Hz, adjust the driving voltage to 4.0V; further reduce the stroboscopic phenomenon of the panel;

[0013] The brightness adjustment algorithm is optimized based on the brightness fluctuation condition, and the brightness change rate is controlled by linear brightness adjustment. In order to ensure the smoothness of the brightness change, the brightness adjustment algorithm needs to dynamically adjust the brightness change rate according to the current brightness fluctuation condition. The rate adjustment needs to consider the current brightness change amplitude, the length of the time interval T, the panel's operating frequency, and the visual comfort requirements; according to the data fed back by the photosensitive sensor, the frequency range and fluctuation amplitude of the display brightness fluctuation are calculated. If the brightness fluctuation amplitude is large, the brightness adjustment rate is reduced, that is, T is lengthened; if the brightness fluctuation amplitude is small, the brightness adjustment rate is increased to maintain linear changes;

[0014] The adjusted driving signal is fed back to the photosensitive sensor, and the stroboscopic changes are continuously monitored. The main control system uses the FFT algorithm to perform frequency analysis on the brightness data returned by the sensor, extract the frequency components and draw a spectrum diagram of the brightness fluctuation. When the analysis results show that the current stroboscopic intensity is too high, the main control system will send a feedback signal to instruct the driving circuit to make further adjustments. The adjusted driving signal is further optimized: if the stroboscopic frequency is concentrated in the low-frequency 60-90Hz area, the main control system will increase the PWM frequency of the driving signal to above 500Hz; if the stroboscopic analysis shows that the brightness fluctuates violently, the system will fine-tune the driving voltage to reduce the amplitude of the brightness fluctuation; if the stroboscopic analysis shows that the driving waveform is not smooth, the main control system will adjust the signal waveform from a square wave to a triangle wave or a sine wave to further reduce the stroboscopic effect;

[0015] The system uses sensors to detect the ambient light intensity and frequency, and intelligently selects the best flicker suppression strategy based on the user's preference for brightness. When the ambient light frequency is above 60Hz, the system uses high-frequency PWM mode to increase the PWM drive frequency to above 500Hz. When it is detected that the ambient light frequency is close to the drive frequency of the display panel, the system automatically adjusts the panel's PWM frequency to make it asynchronous with the ambient light frequency to avoid flicker superposition.

[0016] As a preferred solution of the method for adjusting the stroboscopic frequency of the organic electroluminescent display panel described in the present invention, the method of obtaining the change curve of the panel brightness based on the photosensitive sensor includes: using a photodiode array to sample the output changes of the display panel in different brightness modes at a high frequency, generating a curve of the brightness over time, and if the stroboscopic phenomenon is detected, the curve shows obvious periodic oscillations.

[0017] As a preferred solution of the method for adjusting the stroboscopic frequency of an organic electroluminescent display panel of the present invention, the step of transmitting the change curve to the main control system includes:

[0018] The light sensor is used to collect the display panel brightness change data, and the data is converted into a time series signal. The data is expressed in the form of a sequence:

[0019] (t1,L1),(t2,L2),...,(tn,Ln)

[0020] Among them, tn is the time, and Ln is the brightness at time tn.

[0021] As a preferred solution of the method for adjusting the stroboscopic frequency of an organic electroluminescent display panel of the present invention, wherein: the base transmits the change curve to the main control system, and further comprises: performing certain preprocessing on the collected brightness data, there is a stable DC component in the brightness data, the DC component is removed by subtracting the average brightness value from each brightness value, and then the sampled data is windowed, and the expression is as follows:

[0022] Li′=Li-Mean(L)

[0023] Among them, Li′ is the brightness value after removing the DC component, Mean(L) is the average of all brightness values, and Li is the brightness value collected at a certain moment.

[0024] The beneficial effects of the present invention are as follows: the present invention can accurately detect the source of the frequency of the stroboscopic image and timely adjust the parameters of the driving circuit through the brightness fluctuation monitoring based on the photosensitive sensor and the FFT frequency analysis. The stroboscopic image caused by the low-frequency PWM is reduced through the optimized brightness adjustment algorithm and the linear brightness control, and the visual comfort of the display is effectively improved, especially under low brightness conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0026] Figure 1 The present invention provides a flowchart of a method for adjusting the stroboscopic performance of an organic electroluminescent display panel.

[0027] Figure 2 A flowchart of the steps of stroboscopic frequency analysis of Example 1 of a stroboscopic adjustment method for an organic electroluminescent display panel provided by an embodiment of the present invention.

[0028] Figure 3 A flowchart of the steps of monitoring the stroboscopic changes in Embodiment 1 of a stroboscopic adjustment method for an organic electroluminescent display panel provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1

[0033] Reference Figure 1~Figure 3 , is an embodiment of the present invention, which provides a method for adjusting the stroboscopic frequency of an organic electroluminescent display panel, comprising:

[0034] S1: Obtain the change curve of panel brightness based on the photosensor.

[0035] Preferably, a photodiode array is used to sample the output changes of the display panel in different brightness modes at a high frequency to generate a curve of brightness over time. If a stroboscopic phenomenon is detected, the curve will show obvious periodic oscillations.

[0036] Furthermore, suppose that the brightness adjustment of an organic electroluminescent display panel uses a low-frequency PWM dimming method. The brightness output of the display panel is monitored at a sampling frequency of 10kHz through a photodiode array to generate a brightness curve. After data sampling, Fourier transform analysis is performed to find that there is a 100Hz stroboscopic signal in the brightness curve. The system increases the PWM frequency to 1kHz based on the frequency and amplitude of the stroboscopic signal, and monitors the adjusted panel brightness curve again through the photodiode array. After adjustment, the periodic fluctuations in the brightness curve are greatly reduced, the stroboscopic phenomenon disappears, and the user's visual comfort is significantly improved.

[0037] S2: The change curve is transmitted to the main control system, and the frequency analysis of the brightness fluctuation data is performed through the FFT algorithm to extract the flicker frequency that causes visual fatigue.

[0038] Preferably, the change data of the brightness of the display panel is collected by a photosensitive sensor, and the data is converted into a time series signal, and the data is represented in the form of a sequence:

[0039] (t1,L1),(t2,L2),...,(tn,Ln)

[0040] Among them, tn is the time, and Ln is the brightness at time tn.

[0041] Preferably, the collected brightness data is preprocessed. There is a stable DC component in the brightness data. The DC component is removed by subtracting the average brightness value from each brightness value, and then the sampled data is windowed. The expression is as follows:

[0042] Li′=Li-Mean(L)

[0043] Among them, Li′ is the brightness value after removing the DC component, Mean(L) is the average of all brightness values, and Li is the brightness value collected at a certain moment.

[0044] Preferably, the brightness fluctuation signal in the time domain is converted to the frequency domain by the FFT algorithm to obtain its spectrum information. The FFT converts a set of time series data into frequency components and displays the amplitudes of different frequency components in the signal. The FFT algorithm expression is as follows:

[0045]

[0046] Where x(n) is the brightness time series, X(k) is the complex value in the frequency domain, k is the frequency index, n is the index of the nth sampling point of the time domain signal, j is the imaginary unit, and N is the total number of sampling points;

[0047] Extract the main peaks in the spectrum to determine whether there is a flicker frequency. If the flicker frequency falls between 30-80Hz and has a large amplitude, it can be determined that it is the frequency that causes visual fatigue.

[0048] Furthermore, the organic electroluminescent display panel is sampled at a high frequency (above 10kHz) through a photodiode array to generate brightness fluctuation data that changes over time. Assuming that in a certain period of time, 10,000 brightness data points are sampled per second, the collection lasts for 3 seconds, and a total of 30,000 brightness data points are obtained. The sampled brightness fluctuation data is transmitted to the main control system through the data acquisition system. The main control system receives the voltage signal output by the photodiode array and converts it into a digital signal representing the brightness change of the display panel to generate a brightness-time curve.

[0049] Furthermore, the sampled brightness data sequence is input into the FFT algorithm module. Assuming that the sampled data is x(n), its corresponding frequency domain representation is X(f). The brightness data is converted into frequency components through FFT to generate a brightness fluctuation spectrum, showing the energy of different frequency components. For a sampling sequence of 30,000 data points, FFT will generate a spectrum diagram showing each frequency component from low frequency to high frequency. When analyzing the spectrum diagram, pay special attention to whether there are large frequency components in the low-frequency area (such as 50Hz, 100Hz, etc.). If the amplitude of a specific frequency is high and is associated with visual fatigue, it indicates that this frequency is the main source of the stroboscopic phenomenon.

[0050] Furthermore, the main control system extracts the frequency components that may cause visual fatigue based on the FFT spectrum analysis results. For example, if a large energy peak appears at a frequency of 100 Hz in the spectrum graph, it means that there is a 100 Hz flicker in the brightness fluctuation of the panel.

[0051] S3: Based on the frequency analysis result, adjusting the driving circuit of the organic electroluminescent panel.

[0052] Preferably, if the FFT analysis shows that the stroboscopic frequency is between 30 and 50 Hz, the PWM frequency of the driving circuit is adjusted to 400 Hz;

[0053] If the FFT analysis shows that the stroboscopic frequency is between 50-60Hz, adjust the PWM frequency of the drive circuit to 500Hz;

[0054] If the FFT analysis shows that the flicker frequency is between 60-80Hz, adjust the PWM frequency of the drive circuit to 600Hz; and further observe the flicker condition of the panel. If the flicker analysis shows that the brightness fluctuation is large by adjusting the PWM frequency of the drive circuit, fine-tune the drive voltage to make the panel work in a more stable voltage range to reduce the flicker phenomenon;

[0055] If the PWM frequency of the drive circuit is adjusted to 400Hz, the drive voltage is adjusted to 4.8V;

[0056] If the PWM frequency of the drive circuit is adjusted to 500Hz, the drive voltage is adjusted to 4.4V;

[0057] If the PWM frequency of the driving circuit is adjusted to 600 Hz, the driving voltage is adjusted to 4.0 V, further reducing the flicker phenomenon of the panel.

[0058] Furthermore, the PWM frequency of the display panel was adjusted from the default 250Hz to 400Hz, and the driving voltage was adjusted to 4.8V to stabilize the panel output. After the adjustment, the flicker monitoring showed that the brightness fluctuation frequency had risen to a level higher than the human eye could detect, and the flicker phenomenon was significantly reduced.

[0059] S4: Optimize the brightness adjustment algorithm based on the brightness fluctuation condition, and use linear brightness adjustment to control the brightness change rate.

[0060] Preferably, in order to ensure the smoothness of brightness changes, the brightness adjustment algorithm needs to dynamically adjust the brightness change rate according to the current brightness fluctuation conditions. The rate adjustment needs to consider the current brightness change amplitude, the length of the time interval T, and the operating frequency and visual comfort requirements of the panel; based on the data fed back by the photosensitive sensor, the frequency range and fluctuation amplitude of the display brightness fluctuation are calculated. If the brightness fluctuation amplitude is large, the brightness adjustment rate is reduced, that is, T is lengthened; if the brightness fluctuation amplitude is small, the brightness adjustment rate is increased to maintain linear changes.

[0061] Furthermore, if the brightness is set to be adjusted from 200cd / m² to 300cd / m² and the time is set to 2 seconds, the brightness change rate R is: R=300−2002=50cd / m² / s. During the entire brightness change process, the brightness rises smoothly at a linear rate of 50cd / m² per second. The linear brightness adjustment algorithm achieves brightness adjustment by controlling the PWM signal of the driving circuit. The duty cycle of the PWM signal is proportional to the brightness. While linearly adjusting the brightness, the smoothness of the duty cycle change is ensured. During the process of adjusting the brightness of the system, the duty cycle of the PWM signal gradually increases or decreases, and there will be no jump-type adjustment, avoiding large brightness fluctuations.

[0062] S5: Feed the adjusted driving signal back to the photosensor and continuously monitor the stroboscopic changes.

[0063] Preferably, the main control system uses an FFT algorithm to perform frequency analysis on the brightness data returned by the sensor, extracts frequency components and draws a spectrum diagram of the brightness fluctuation. When the analysis results show that the current stroboscopic intensity is too high, the main control system will send a feedback signal to instruct the drive circuit to make further adjustments, and the adjusted drive signal will be further optimized: if the stroboscopic frequency is mainly concentrated in the low-frequency area, the main control system will increase the PWM frequency of the drive signal to above 500 Hz; if the stroboscopic analysis shows that the brightness fluctuates violently, the system will fine-tune the drive voltage to reduce the amplitude of the brightness fluctuation; if the stroboscopic analysis shows that the drive waveform is not smooth, the main control system will adjust the signal waveform from a square wave to a triangle wave or a sine wave to further reduce the stroboscopic effect.

[0064] Furthermore, the system samples the brightness of the display panel at a frequency of 10kHz through a photosensitive sensor, and collects the brightness change data of the panel in different brightness modes in real time. Assuming that the brightness fluctuation data of the panel is a set of periodically changing waveforms, the photosensitive sensor records the brightness-time curve. The main control system transmits the brightness fluctuation data collected by the photosensitive sensor to the processing module, and uses fast Fourier transform (FFT) to perform frequency analysis on the data. Through FFT analysis, the system converts the time domain signal into a frequency domain signal and generates a spectrum diagram of the brightness fluctuation. Assume that the spectrum diagram shows several main frequency components, which are located at 40Hz, 60Hz and 90Hz respectively.

[0065] Furthermore, the system determines the severity of the stroboscopic phenomenon based on the intensity of the frequency components in the spectrum diagram.

[0066] If the stroboscopic effect is mainly concentrated in the low-frequency range of 30Hz - 50Hz, the system considers that the stroboscopic effect is more obvious and will cause discomfort to the user's vision. According to the frequency analysis results, the main control system sends a feedback signal to the drive circuit and makes the following adjustments: If the stroboscopic effect is concentrated in the low-frequency range of 30Hz - 50Hz, the system increases the PWM frequency of the drive circuit from the original 200Hz to more than 500Hz to reduce the low-frequency stroboscopic phenomenon. The increase in PWM frequency will make the brightness change frequency of the display panel greater than the visual fusion threshold of the human eye, thereby reducing the perceptibility of stroboscopic effect.

[0067] Furthermore, if the stroboscopic analysis finds that the brightness fluctuates violently (i.e., the brightness fluctuates by a large amplitude), the main control system will further adjust the driving voltage to reduce the amplitude of the brightness fluctuation. Assuming that the amplitude of the brightness fluctuation is large, the main control system fine-tunes the driving voltage: when the PWM frequency is adjusted to 500Hz, the driving voltage is fine-tuned from 4.8V to 4.4V, so that the display panel operates within a more stable voltage range, reducing brightness fluctuations and stroboscopic phenomena. If the stroboscopic analysis shows that the waveform of the current driving signal is not smooth, the main control system will adjust the waveform type of the driving signal. By changing the waveform of the driving signal from the original square wave to a triangle wave or a sine wave, the brightness change process is smoothed and the stroboscopic effect is further reduced.

[0068] S6: The sensor detects the ambient light intensity and frequency, and intelligently selects the best flicker suppression strategy based on the user's preference for brightness.

[0069] Preferably, when the ambient light frequency is above 60 Hz, the system adopts a high-frequency PWM mode to increase the PWM drive frequency to above 500 Hz; when it is detected that the ambient light frequency is close to the drive frequency of the display panel, the system automatically adjusts the PWM frequency of the panel to make it asynchronous with the ambient light frequency to avoid flicker superposition.

[0070] Furthermore, assuming that the ambient light frequency is 60 Hz, the sensor transmits the measured ambient light frequency data to the main control system and compares it with the current driving frequency of the display panel. The main control system determines whether there is a stroboscopic superposition phenomenon by comparing the detected ambient light frequency with the current PWM driving frequency of the display panel.

[0071] Furthermore, if the PWM drive frequency of the display panel is 250Hz (lower than the multiple of the ambient light frequency), the system will determine that the two frequencies are likely to overlap, exacerbating the stroboscopic effect. According to the results of the frequency comparison, if the ambient light frequency is detected to be 60Hz and the PWM frequency of the panel is near its multiple (such as 240Hz, 300Hz), the main control system will trigger the high-frequency PWM mode and automatically increase the PWM drive frequency of the display panel to above 500Hz to avoid synchronization problems with the ambient light frequency.

[0072] For example, the current PWM frequency is increased from 250Hz to 500Hz to ensure that it is far away from the multiple of the ambient light frequency, thereby reducing the flicker phenomenon. The increased PWM frequency makes the display panel brightness change frequency exceed the visual fusion threshold of the human eye, while avoiding the flicker superposition effect.

[0073] Furthermore, if the system finds that the frequency of the ambient light source is too close to the PWM frequency of the display panel (for example, the ambient light frequency is 50Hz, while the display panel PWM frequency is close to 250Hz), the main control system automatically adjusts the PWM frequency of the panel to ensure that the two are not synchronized. The system dynamically adjusts the PWM frequency through an algorithm to keep the brightness stability of the panel while not overlapping with the ambient light frequency.

[0074] For example: when the system detects that the ambient light frequency is 60Hz, the panel's PWM frequency will automatically adjust to 510Hz or higher to avoid harmonic effects between the two.

[0075] Furthermore, after adjusting the PWM frequency of the panel, the main control system continues to monitor the ambient light frequency and the brightness fluctuation data of the display panel. The light sensor continuously monitors the flicker of the panel. If the flicker is still obvious, the system will further fine-tune the PWM frequency to ensure that the flicker intensity is minimized. At the same time, the system can also further optimize the PWM frequency and voltage according to the user's brightness preference to ensure visual comfort.

[0076] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for adjusting the stroboscopic performance of an organic electroluminescent display panel, characterized in that: include: Obtain the change curve of panel brightness based on the photosensitive sensor; The change curve is transmitted to the main control system, and the brightness fluctuation data is subjected to frequency analysis through the FFT algorithm to extract the stroboscopic frequency that causes visual fatigue. The brightness fluctuation signal in the time domain is converted to the frequency domain through the FFT algorithm to obtain its spectrum information. FFT converts a set of time series data into frequency components and displays the amplitudes of different frequency components in the signal. The FFT algorithm expression is as follows: Where x(n) is the brightness time series, X(k) is the complex value in the frequency domain, k is the frequency index, n is the index of the nth sampling point of the time domain signal, j is the imaginary unit, and N is the total number of sampling points; Extract the main peaks in the spectrum to determine whether there is a stroboscopic frequency. If the stroboscopic frequency is between 30-80Hz and has a large amplitude, it can be determined to be the frequency that causes visual fatigue. Based on the frequency analysis results, adjust the driving circuit of the organic electroluminescent panel. If the FFT analysis shows that the stroboscopic frequency is between 30-50Hz, adjust the PWM frequency of the driving circuit to 400Hz; if the FFT analysis shows that the stroboscopic frequency is between 50-60Hz, adjust the PWM frequency of the driving circuit to 500Hz; if the FFT analysis shows that the stroboscopic frequency is between 60-80Hz, adjust the PWM frequency of the driving circuit to 600Hz; and further observe the stroboscopic condition of the panel. If the stroboscopic analysis shows that the brightness fluctuation amplitude is large by adjusting the PWM frequency of the driving circuit, fine-tune the driving voltage to make the panel work in a more stable voltage range to reduce the stroboscopic phenomenon; if the PWM frequency of the driving circuit is adjusted to 400Hz, adjust the driving voltage to 4.8V; if the PWM frequency of the driving circuit is adjusted to 500Hz, adjust the driving voltage to 4.4V; if the PWM frequency of the driving circuit is adjusted to 600Hz, adjust the driving voltage to 4.0V; further reduce the stroboscopic phenomenon of the panel; The brightness adjustment algorithm is optimized based on the brightness fluctuation condition, and the brightness change rate is controlled by linear brightness adjustment. In order to ensure the smoothness of the brightness change, the brightness adjustment algorithm needs to dynamically adjust the brightness change rate according to the current brightness fluctuation condition. The rate adjustment needs to consider the current brightness change amplitude, the length of the time interval T, the panel's operating frequency, and the visual comfort requirements; according to the data fed back by the photosensitive sensor, the frequency range and fluctuation amplitude of the display brightness fluctuation are calculated. If the brightness fluctuation amplitude is large, the brightness adjustment rate is reduced, that is, T is lengthened; if the brightness fluctuation amplitude is small, the brightness adjustment rate is increased to maintain linear changes; The adjusted driving signal is fed back to the photosensitive sensor, and the stroboscopic changes are continuously monitored. The main control system uses the FFT algorithm to perform frequency analysis on the brightness data returned by the sensor, extract the frequency components and draw a spectrum diagram of the brightness fluctuation. When the analysis results show that the current stroboscopic intensity is too high, the main control system will send a feedback signal to instruct the driving circuit to make further adjustments. The adjusted driving signal is further optimized: if the stroboscopic frequency is concentrated in the low-frequency 60-90Hz area, the main control system will increase the PWM frequency of the driving signal to above 500Hz; if the stroboscopic analysis shows that the brightness fluctuates violently, the system will fine-tune the driving voltage to reduce the amplitude of the brightness fluctuation; if the stroboscopic analysis shows that the driving waveform is not smooth, the main control system will adjust the signal waveform from a square wave to a triangle wave or a sine wave to further reduce the stroboscopic effect; The system uses sensors to detect the ambient light intensity and frequency, and intelligently selects the best flicker suppression strategy based on the user's preference for brightness. When the ambient light frequency is above 60Hz, the system uses high-frequency PWM mode to increase the PWM drive frequency to above 500Hz. When it is detected that the ambient light frequency is close to the drive frequency of the display panel, the system automatically adjusts the panel's PWM frequency to make it asynchronous with the ambient light frequency to avoid flicker superposition.

2. The method for adjusting the stroboscopic performance of an organic electroluminescent display panel according to claim 1, wherein: The method of obtaining a change curve of panel brightness based on a photosensitive sensor includes: A photodiode array is used to sample the output changes of the display panel in different brightness modes at a high frequency to generate a curve of brightness over time. If a flicker phenomenon is detected, the curve will show obvious periodic oscillations.

3. The method for adjusting the stroboscopic performance of an organic electroluminescent display panel according to claim 1, wherein: The step of transmitting the change curve to the main control system comprises: The light sensor is used to collect the display panel brightness change data, and the data is converted into a time series signal. The data is expressed in the form of a sequence: (t1,L1),(t2,L2),...,(tn,Ln) Among them, tn is the time, and Ln is the brightness at time tn.

4. The method for adjusting the stroboscopic performance of an organic electroluminescent display panel according to claim 1 or 3, wherein: The transmitting of the change curve to the main control system also includes: The collected brightness data is preprocessed. There is a stable DC component in the brightness data. The DC component is removed by subtracting the average brightness value from each brightness value, and then the sampled data is windowed. The expression is as follows: Li′=Li-Mean(L) Among them, Li′ is the brightness value after removing the DC component, Li is the brightness value collected at a certain moment, and Mean(L) is the average value of all brightness values.

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