LCD (liquid crystal display) aging compensation control method and system

Abstract

The invention provides an LCD liquid crystal display screen aging compensation control method and system, and relates to the technical field of LCD liquid crystal display screen aging compensation control. A static area with long-time fixed brightness in a liquid crystal display screen is determined according to continuous multi-frame display image analysis, and a voltage disturbance signal is introduced aiming at the driving voltage of the static area, so that the brightness of the liquid crystal display screen is adjusted. And the driving voltage is controlled and compensated according to the voltage disturbance signal so as to disperse the voltage stress of the static area of the liquid crystal display screen. The method effectively solves the problems that in the prior art, when a liquid crystal display screen displays a fixed picture for a long time, due to local aging of a thin film transistor, the display effect is not uniform, and brands or ghosts appear, and the defect that a traditional compensation method is difficult to effectively deal with the complex local aging condition is overcome.

Description

Technical Field

[0001] This application relates to the field of LCD screen aging compensation control technology, and more specifically, to an LCD screen aging compensation control method and system. Background Technology

[0002] After prolonged use, the thin-film transistors inside an LCD screen gradually age, leading to uneven display quality. This aging becomes particularly noticeable and localized in specialized applications requiring the display of static images for extended periods, resulting in persistent "burn-in" or "ghosting" on the screen. Traditional compensation methods are often ineffective in addressing this complex aging process because they are typically designed to handle overall, gradual aging.

[0003] The core of an LCD screen is a thin-film transistor (TFT) array, with each TFT controlling the on / off state of a pixel. Over time, the electrical characteristics of these TFTs change, a process commonly known as aging. The direct consequence of aging is an impact on the accuracy of the voltage applied to the liquid crystal, leading to a shift in pixel brightness. Ideally, if all TFTs aged at the same rate, the brightness of the entire screen would decrease uniformly. However, in reality, due to uneven heat distribution within the display—for example, areas near the drive circuitry or power board are hotter—the TFTs in these areas age faster than in other areas, resulting in uneven brightness and color banding. To address this, a compensation system is typically integrated into the display. This system calculates the degree of aging for each TFT based on a preset aging pattern or information from sensors, and then adjusts the data voltage applied to each pixel through a compensation program to counteract the effects of aging, thus maintaining visual uniformity of the screen display. This method has achieved good results in common consumer electronics products, such as home televisions and office monitors, because the content displayed on these devices is usually dynamically changing, and the aging process is relatively gradual and predictable.

[0004] However, in certain industrial or commercial applications, this conventional compensation method proves inadequate. For example, on industrial control panels on production lines, flight information displays at airports, or POS systems in retail stores, screens need to display a fixed user interface continuously for extended periods, even years. This interface contains numerous static elements, such as fixed button icons, title bars, input boxes, and company logos. This usage pattern causes the thin-film transistors (TFTs) in the corresponding areas of the screen to be subjected to continuous, high-intensity electrical signals, resulting in severe and highly concentrated localized aging. In contrast, the areas of the interface used to display changing data show much less aging of the TFTs. This creates a precipitous difference in the degree of aging between different areas of the screen. Existing compensation systems, whose internal compensation programs are mostly designed to handle large-area, gradual overall aging, generate compensation values ​​that transition smoothly across the entire screen. When faced with this type of localized aging caused by static images and distinct boundaries, this smooth compensation cannot accurately match the situation. As a result, even though the compensation system is working, visible "burn-in" or "ghosting" still appears on the screen.

[0005] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0006] This application discloses an aging compensation control method and system for LCD liquid crystal display screens, which aims to solve the problem of uneven display effect, "burn-in" or "ghosting" caused by local aging of thin film transistors when displaying a fixed image on an LCD display screen for a long time, as well as the shortcomings of existing compensation methods in effectively dealing with such complex local aging conditions.

[0007] The technical solution of this application is as follows: In a first aspect, this application discloses an aging compensation control method for an LCD liquid crystal display screen, the method comprising: Based on the analysis of multiple consecutive frames of displayed images, a static region with a fixed brightness for a long time in the liquid crystal display screen is determined; this static region corresponds to a driving voltage. A voltage disturbance signal is introduced based on the driving voltage of the static region; The driving voltage is controlled and compensated according to the voltage disturbance signal to disperse the voltage stress in the static area of ​​the liquid crystal display screen; the voltage disturbance signal includes the signal amplitude and the signal frequency.

[0008] Furthermore, according to the LCD liquid crystal display screen aging compensation control method, a voltage disturbance signal is introduced based on the driving voltage of the static area, including: introducing a voltage disturbance signal on the driving voltage of the static area according to a preset disturbance mode; the preset disturbance mode includes a time-dimensional disturbance mode and a spatial-dimensional disturbance mode.

[0009] Based on this, the time-dimensional perturbation mode includes: applying a voltage perturbation signal with a first preset frequency and a first preset amplitude to the driving voltage between consecutive display frames, centered on the target voltage value; the first preset frequency is less than a first frequency threshold and the first preset amplitude is less than a first amplitude threshold; the spatial-dimensional perturbation mode includes: dividing the static area into several sub-areas, controlling the driving voltage corresponding to each adjacent pixel in the sub-area to apply the voltage perturbation signal with the first preset amplitude centered on the target voltage value, and ensuring that the average value of the driving voltage corresponding to each adjacent pixel in the sub-area remains unchanged.

[0010] In some preferred embodiments, according to the LCD screen aging compensation control method, a voltage disturbance signal is introduced based on the driving voltage of the static area, including: For this static region, a composite spectral perturbation signal containing a main perturbation signal and a diagnostic sub-signal is generated as a voltage perturbation signal; wherein, the main perturbation signal is used to suppress thin-film transistor aging, and the diagnostic sub-signal serves as a diagnostic probe; The composite spectrum perturbation signal is applied to the static area, the electrical feedback caused by the diagnostic sub-signal in the pixel driving circuit is monitored, the feedback characteristics are obtained, the feedback characteristics are compared with the preset benchmark, the dielectric properties are determined to be abnormal and the abnormal area is located. The parameters of the perturbation signal corresponding to the composite spectral perturbation signal are adaptively adjusted for the abnormal region.

[0011] Furthermore, the preset reference includes a reference amplitude and a reference phase; the electrical feedback caused by the diagnostic sub-signal in the monitoring pixel driving circuit is used to acquire feedback characteristics, compare these feedback characteristics with the preset reference, determine dielectric property abnormalities, and locate abnormal regions, including: The diagnostic sub-signal is applied to any pixel group corresponding to the static region, and the actual response amplitude and actual phase of the pixel group are acquired. The actual response amplitude and actual phase are compared with the reference amplitude and reference phase, respectively, to determine that there is a health abnormality in the thin-film transistor gate dielectric layer of the pixel group, and the coordinates of the pixel group are written into the abnormal region mapping table; the abnormal region mapping table is stored in the internal memory of the display controller.

[0012] As an option, the main disturbance signal is a high-frequency, low-amplitude sine wave or pseudo-random noise signal; the diagnostic sub-signal is one or more low-amplitude signals with specific frequencies and phases.

[0013] To enhance functionality, the perturbation signal parameters corresponding to the composite spectrum perturbation signal are adaptively adjusted for the abnormal region. This includes: acquiring the current ambient light intensity and the user's viewing distance; calculating the human eye brightness change perception threshold based on the ambient light intensity and the user's viewing distance; comparing the proposed change in the perturbation signal parameter with the human eye brightness change perception threshold to control the adjustment range of the perturbation signal parameter; and determining whether the perturbation signal parameter exceeds the safety limit based on historical adjustment data of the perturbation signal parameter, and triggering an early warning.

[0014] Based on the above, the method further includes: setting a non-display area of ​​the liquid crystal display as a noise reference area; the non-display area includes the screen bezel pixel strip or a solid color image acquired during vertical blanking; performing frequency domain analysis on the pixel sequence of the noise reference area to identify high-frequency noise components with significant energy higher than the display refresh rate and their corresponding amplitudes, and constructing a dynamic model of the current environmental noise; based on the dynamic model, applying an adaptive digital filter to denoise the time series of brightness or color values ​​of each pixel in the static area; the center frequency of the filter is dynamically adjusted according to the high-frequency noise components; and calculating the fluctuation range of the denoised pixel sequence.

[0015] Preferably, determining the static area with a fixed brightness for a long time in the liquid crystal display includes: comparing the fluctuation range with a preset stability threshold; if the fluctuation range is less than the preset stability threshold, then determining the pixel sequence as a static pixel; when all pixels in a continuous pixel area are determined to be static pixels, then marking the pixel area as a static area.

[0016] Secondly, this application also discloses an LCD screen aging compensation control system, which includes: a determination module, used to determine a static area with a fixed brightness for a long time in the LCD screen based on the analysis of multiple consecutive display images; the static area corresponds to a driving voltage; a disturbance module, used to introduce a voltage disturbance signal based on the driving voltage of the static area; and a compensation control module, used to control the compensation of the driving voltage based on the voltage disturbance signal to disperse the voltage stress in the static area of ​​the LCD screen; the voltage disturbance signal includes a signal amplitude and a signal frequency. Beneficial effects

[0017] The LCD screen aging compensation control method disclosed in this application identifies static areas with consistently high brightness in the LCD screen by analyzing multiple consecutive frames of displayed images. A voltage disturbance signal is introduced into the driving voltage of these static areas, and the driving voltage is then compensated based on this disturbance signal to disperse the voltage stress in the static areas of the LCD screen. This method effectively solves the problems of uneven display effects, "burn-in," or "ghosting," caused by localized aging of thin-film transistors when displaying a fixed image for a long time in existing technologies, as well as the shortcomings of traditional compensation methods in effectively dealing with such complex localized aging conditions. By introducing a voltage disturbance signal, this application can actively disperse the voltage stress in static areas, thereby suppressing localized aging of thin-film transistors, significantly extending the lifespan of the display screen, and maintaining the uniformity and consistency of the displayed image. It overcomes the limitations of existing compensation systems in handling clearly defined localized aging caused by static images, achieving unexpected technical effects. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating the steps of the LCD liquid crystal display screen aging compensation control method disclosed in an embodiment of the present invention; Figure 2 This is a schematic diagram of the LCD liquid crystal display screen aging compensation control system disclosed in an embodiment of the present invention. Detailed Implementation

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which these embodiments belong; the terminology used herein and in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit these embodiments; the terms "comprising" and "having," and any variations thereof, in the specification of these embodiments and the foregoing drawings, are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification of these embodiments and the foregoing drawings are used to distinguish different objects, not to describe a particular order.

[0021] The implementation details of the technical solution in this embodiment are described in detail below: When displaying a static image for an extended period, the thin-film transistors inside traditional LCD screens gradually age, leading to uneven display quality. This aging becomes particularly noticeable and localized in specialized applications requiring long-term static image display, resulting in persistent "burn-in" or "ghosting" on the screen. Traditional compensation methods often struggle to effectively address this complex aging process because they are typically designed to handle overall, gradual aging and are ill-suited to precisely matching the distinct localized aging caused by static images.

[0022] In response, this application proposes an aging compensation control method for LCD liquid crystal displays, such as... Figure 1 As shown, the method includes: S101, Based on the analysis of multiple consecutive frames of displayed images, determine the static area in the liquid crystal display screen with a fixed brightness for a long time; the static area corresponds to a driving voltage; S102, a voltage disturbance signal is introduced based on the driving voltage of the static region; S103, control the compensation of the driving voltage according to the voltage disturbance signal to disperse the voltage stress in the static area of ​​the liquid crystal display screen; the voltage disturbance signal includes signal amplitude and signal frequency.

[0023] This application introduces a voltage disturbance signal, which can effectively disperse the voltage stress in the static area of ​​the liquid crystal display screen, thereby significantly alleviating the local aging problem of thin film transistors and improving the long-term stability and display uniformity of the display screen.

[0024] To facilitate a clearer understanding of the technical solutions in this application, the key terms involved are explained first. A liquid crystal display (LCD) is a device that displays images by controlling the arrangement of liquid crystal molecules, with each pixel driven by one or more thin-film transistors (TFTs). TFT aging refers to the irreversible changes in its electrical characteristics over time, typically manifested as threshold voltage drift and decreased mobility, thus affecting pixel brightness output. A static area refers to an area on the LCD display that displays content at a fixed brightness for an extended period, such as fixed icons or text in a user interface. The driving voltage is the voltage applied to the gate or source of the TFT to control pixel brightness. A voltage perturbation signal is a small, periodically changing voltage signal superimposed on the driving voltage. Its purpose is to dynamically change the actual operating point of the pixel, preventing the TFT from operating in a single state for extended periods, thereby dispersing its voltage stress. Voltage stress refers to the internal electric field pressure generated by the TFT enduring a fixed voltage for a long time, and is one of the main causes of aging. Signal amplitude refers to the maximum instantaneous voltage value of the voltage perturbation signal, and signal frequency refers to the number of cycles per second that the voltage perturbation signal changes.

[0025] The core of the LCD screen aging compensation control method in this application lies in dispersing the voltage stress in static areas by introducing voltage disturbance signals. Specifically, this method first needs to determine the static areas in the LCD screen. This can be achieved by analyzing multiple consecutive frames of displayed images. For example, an image frame buffer can be set up to store the most recent N frames of image data. By comparing the brightness or color value of each pixel in these image frames, if a pixel's brightness or color value remains unchanged in N consecutive frames, it can be marked as a static pixel. When all pixels in a consecutive pixel area are determined to be static pixels, that area is identified as a static area. Another approach is to directly identify preset static element areas by analyzing display content metadata, such as user interface (UI) layout files or scene recognition information from video streams. Once the static area is determined, the driving voltage corresponding to that area can be obtained.

[0026] Next, a voltage disturbance signal is introduced based on the determined driving voltage of the static area. There are several ways to introduce the voltage disturbance signal. For example, a preset voltage disturbance signal can be generated by a separate signal generator and then superimposed on the driving voltage of the static area. This superposition can be achieved using analog circuits, such as using an adder circuit to mix the disturbance signal with the driving voltage, or by performing calculations in the digital domain using a digital signal processor (DSP) and then outputting the result via a digital-to-analog converter (DAC). The parameters of the disturbance signal, including signal amplitude and signal frequency, can be preset during system initialization or adjusted according to factors such as the display model and the usage environment. For example, a low-amplitude, high-frequency sine wave can be used as the voltage disturbance signal and superimposed on the driving voltage of the static area.

[0027] Finally, the driving voltage is compensated based on the introduced voltage disturbance signal to disperse the voltage stress in the static area of ​​the liquid crystal display. The compensation control module receives the disturbance signal and the original driving voltage, and adjusts the driving voltage according to the characteristics of the disturbance signal. For example, if the disturbance signal is a periodic sine wave, the compensation control module can make the driving voltage fluctuate slightly around the original value in each cycle. This fluctuation makes the operating point of the thin-film transistor no longer fixed, but periodically changes within a certain range. In this way, the thin-film transistor will not be subjected to a single voltage stress for a long time at any given moment, thereby effectively dispersing the internal electric field pressure and slowing down the aging process. For example, a feedback control loop can be designed to monitor the pixel response in the static area in real time and dynamically adjust the driving voltage according to the parameters of the disturbance signal to ensure that the disturbance effect is optimal without affecting the human eye's perception of the displayed content.

[0028] The overall working principle of this application is to dynamically change the operating state of the thin-film transistors (TFTs) in static areas of a liquid crystal display (LCD) with a fixed brightness for extended periods by introducing a tiny voltage perturbation signal. This disperses the voltage stress on the TFTs and effectively suppresses localized aging. Specifically, the system first intelligently analyzes multiple consecutive frames of displayed images to accurately identify static areas on the screen that display fixed content for extended periods. The TFTs in these areas are prone to localized aging and "burn-in" due to prolonged exposure to a single driving voltage. Once a static area is identified, the system specifically acquires the corresponding driving voltage for that area. Subsequently, a carefully designed voltage perturbation signal, with optimized amplitude and frequency, is introduced and superimposed onto these driving voltages. This perturbation signal causes the driving voltage in the static area to fluctuate periodically within a tiny range, rather than remaining constant. This tiny voltage fluctuation is sufficient to cause a slight shift in the operating point of the TFT within a short time, thus preventing the TFT from being subjected to a single electric field stress for an extended period. Ultimately, through this dynamic voltage perturbation, the voltage stress of the thin-film transistor is effectively dispersed, and its aging rate is significantly slowed down. This fundamentally solves the technical problem of localized aging in the static area of ​​the liquid crystal display, and significantly improves the long-term stability and display uniformity of the display.

[0029] The core innovation of this application lies in its proposed refined compensation control method based on voltage perturbation signals to address the persistent problem of localized aging in liquid crystal displays (LCDs). Traditional methods often employ global or large-area compensation strategies, which are insufficient to effectively address the distinct localized aging caused by static images. In contrast, this application achieves effective dispersion of localized voltage stress by precisely identifying static areas and selectively introducing voltage perturbation signals with specific amplitudes and frequencies. This method avoids thin-film transistors (TFTs) operating in a single state for extended periods, thus significantly slowing down the rate of localized aging. For example, in applications such as industrial control panels that require long-term display of fixed interfaces, traditional compensation methods may result in noticeable "ghosting" in fixed button or text areas. The method in this application, by superimposing minute perturbation signals on the driving voltage of these static areas, enables the TFTs in these areas to periodically change their operating points, effectively suppressing the formation of "ghosting." This refined localized compensation strategy not only improves the long-term reliability of the display but also significantly enhances the user experience, demonstrating remarkable technological advancement.

[0030] In some embodiments described above, a voltage disturbance signal is introduced based on the driving voltage of a static region. However, in practical applications, if the introduction of the voltage disturbance signal lacks a strategic approach, it may fail to maximize the dispersion of voltage stress and may even introduce display anomalies perceptible to the human eye in certain situations. To address this, this application further proposes introducing a voltage disturbance signal based on a preset disturbance mode for the driving voltage of the aforementioned static region. This preset disturbance mode includes a time-dimensional disturbance mode and a spatial-dimensional disturbance mode, to more precisely manage the application of the voltage disturbance signal.

[0031] Specifically, a voltage perturbation signal is introduced based on the driving voltage of the aforementioned static region, including: introducing a voltage perturbation signal onto the driving voltage of the static region according to a preset perturbation mode; the preset perturbation mode includes a time-dimensional perturbation mode and a spatial-dimensional perturbation mode. The preset perturbation mode aims to optimize the application effect of the voltage perturbation signal, effectively dispersing voltage stress while minimizing its impact on display quality. The time-dimensional perturbation mode refers to perturbing the driving voltage over a time sequence, such as making small adjustments to the voltage value between consecutive display frames. The spatial-dimensional perturbation mode refers to perturbing the driving voltage in the physical space of the display area, such as applying differential voltage values ​​between adjacent pixels or within sub-regions. By combining these two perturbation modes, multi-dimensional and refined dispersion of voltage stress in the static region can be achieved.

[0032] The solution proposed in this application introduces a preset perturbation mode, ensuring that the application of voltage perturbation signals is no longer random or singular, but rather follows a defined temporal and spatial strategy. The temporal perturbation mode ensures that the driving voltage in static areas is not completely fixed between different display frames, but rather fluctuates periodically or aperiodically in a way that is imperceptible to the human eye. This effectively prevents liquid crystal molecules from being in a single bias state for extended periods, mitigating the aging effect of thin-film transistors. The spatial perturbation mode, by differentially perturbing the driving voltage of adjacent pixels or sub-regions in physical space, disperses the voltage stress in local areas spatially, preventing specific pixels or regions from bearing high stress for extended periods, further improving the uniformity and effectiveness of aging compensation. This multi-dimensional perturbation strategy can more comprehensively and precisely disperse the voltage stress in the static areas of the liquid crystal display screen, significantly reducing the occurrence and development of aging phenomena.

[0033] By employing a preset perturbation mode to introduce voltage perturbation signals, the above technical solution allows for more strategic and targeted dispersion of voltage stress. Compared to patternless random perturbation, this solution more effectively prevents premature aging in static areas of the LCD screen, extending its lifespan. Furthermore, through refined temporal and spatial perturbations, effective dispersion of voltage stress can be achieved without introducing significant visual artifacts, thereby improving screen reliability while maintaining good display quality. This patterned perturbation method significantly improves the efficiency of aging compensation and enhances the user experience.

[0034] In some preferred embodiments, it is assumed that a certain area of ​​an LCD display screen is defined as a static area with a fixed brightness for a long period of time. To introduce a voltage perturbation signal to disperse the voltage stress in this area, a preset perturbation mode can be employed. Specifically, a time-dimensional perturbation mode can be set, for example, by subjecting the driving voltage of the static area to small alternating positive and negative perturbations over a continuous 10-frame display cycle, causing it to fluctuate at a very low frequency and with a very small amplitude near the target voltage value. For example, a perturbation of +0.01V is applied in frames 1, 3, 5, 7, and 9, and a perturbation of -0.01V is applied in frames 2, 4, 6, 8, and 10. Simultaneously, a spatial-dimensional perturbation mode can be set, for example, dividing the static area into 2x2 sub-regions. Within each sub-region, the driving voltages of adjacent pixels (e.g., pixel A and pixel B) are subjected to small perturbations in opposite directions within the same frame, for example, pixel A is subjected to +0.005V and pixel B is subjected to -0.005V, while ensuring that the average driving voltage of the entire sub-region remains constant. This pre-set perturbation pattern, which combines time and space, can effectively disperse voltage stress in static areas while preventing changes in brightness or color from being perceived by the human eye.

[0035] In some embodiments described above in this application, a voltage disturbance signal is introduced into the driving voltage of the static region according to a preset disturbance mode. The preset disturbance mode includes a time-dimensional disturbance mode and a spatial-dimensional disturbance mode. Specifically, the aforementioned time-dimensional disturbance mode and spatial-dimensional disturbance mode can be further refined as follows.

[0036] The time-dimensional perturbation mode includes: applying a voltage perturbation signal with a first preset frequency and a first preset amplitude to the driving voltage between consecutive display frames, centered on the target voltage value; the first preset frequency is less than a first frequency threshold and the first preset amplitude is less than a first amplitude threshold; the spatial-dimensional perturbation mode includes: dividing the static area into several sub-regions, controlling the driving voltage corresponding to each adjacent pixel in the sub-region to apply a voltage perturbation signal with the first preset amplitude centered on the target voltage value, and ensuring that the average value of the driving voltage corresponding to each adjacent pixel in the sub-region remains unchanged.

[0037] Specifically, the time-dimensional perturbation mode refers to the periodic or non-periodic minute adjustments to the driving voltage of the static area of ​​the liquid crystal display screen along the time axis. The target voltage value can be understood as the original driving voltage of the pixel in that static area when no perturbation is applied. The first preset frequency refers to the rate of change of the voltage perturbation signal over time, which is set to be less than a first frequency threshold to ensure that the frequency change is imperceptible to the human eye. The first preset amplitude refers to the fluctuation range of the voltage perturbation signal, which is set to be less than a first amplitude threshold to ensure that minute voltage changes do not cause perceptible fluctuations in pixel brightness. By applying this low-frequency, low-amplitude voltage perturbation signal between consecutive display frames, it is possible to prevent liquid crystal molecules from being in a single deflection state for extended periods.

[0038] Furthermore, the spatial dimension perturbation mode refers to the fine-grained management of pixel driving voltages within a static area in the physical space of the display area. Specifically, the static area can be divided into several sub-regions, each containing a group of adjacent pixels. Within these sub-regions, the driving voltages of each adjacent pixel are subjected to a voltage perturbation signal of the first preset amplitude, centered on a target voltage value. The key is that while applying the perturbation, the average driving voltage of each adjacent pixel within the sub-region must remain constant. For example, when the driving voltage of a pixel is slightly increased, the driving voltages of one or more adjacent pixels are slightly decreased, thus ensuring that the overall average brightness within the sub-region remains unchanged, guaranteeing visual uniformity.

[0039] The principle flow of this embodiment can be divided into: 1. Static region identification and marking: The display's driving system continuously analyzes the image data of each frame. It carefully compares pixel information across multiple consecutive frames, automatically identifying areas on the screen that remain unchanged for extended periods. Once these static content areas are identified, the system internally marks them for subsequent special processing. The image processing unit within the driving system, such as a high-performance Field Programmable Gate Array (FPGA) or a dedicated display controller chip, incorporates an "inter-frame pixel comparison module." This module caches the image data of the most recent N frames (e.g., N=5 to 10 frames). For each pixel on the screen, it compares the pixel value of the current frame with the corresponding pixel value of the previous N frames. If the brightness and color value changes of a pixel within N consecutive frames are both less than a preset minimum threshold (e.g., brightness change less than 1%, RGB color component change less than one gray level), then that pixel is determined to be a static pixel. When a continuous pixel area (e.g., an area larger than 10x10 pixels) is determined to be static, that area is marked by the system as a "static display area." This recognition mechanism is particularly suitable for scenarios with fixed user interfaces (UIs), such as industrial control panels, and directly addresses the problem of localized aging caused by displaying fixed content for extended periods.

[0040] 2. Generation of micro-perturbation signals: For areas marked as static content, the drive controller no longer applies a completely constant voltage to maintain their brightness, as is traditionally done. Instead, it subtly introduces a very small, high-frequency voltage disturbance near the voltage value corresponding to the target brightness, completely imperceptible to the human eye. Inside the drive controller, the voltage output of the digital-to-analog converter (DAC) for the marked static area is no longer a single, fixed value. For example, if the target brightness of a static pixel requires a drive voltage of 1.5V, the system generates a high-frequency disturbance signal centered at 1.5V with an amplitude between ±5 millivolts (mV) (i.e., 1.495V to 1.505V). The frequency of this disturbance signal is typically set in a range imperceptible to the human eye, such as between 100 Hz and 1 kHz, far exceeding the display's refresh rate. This disturbance signal can be generated by a dedicated "micro-disturbance generation module", which can be a small digital signal processor (DSP) or logic circuit inside an FPGA. It receives the target voltage value and superimposes a sine wave, square wave or pseudo-random noise signal with a preset frequency and amplitude.

[0041] 3. Disturbance mode selection and application: Temporal perturbation: This perturbation can be manifested over time. For example, between consecutive display frames, the driving voltage of the same static pixel will fluctuate slightly and periodically around the target voltage value. This fluctuation is so small that it will not cause visual flicker or brightness changes.

[0042] Spatial Dimensional Perturbation: This perturbation can also be manifested spatially. For example, within a static area displaying a solid color block, adjacent pixels will exchange tiny, random brightness values. This means that although the brightness of individual pixels may vary slightly, the average brightness of the entire color block appears completely uniform to the human eye.

[0043] Among them, the temporal dimension perturbation: For a marked static pixel, its driving voltage V_drive can be fine-tuned between consecutive frames n and n+1 according to the following formula: V_drive(n) = V_target + A sin(2π×f_perturbation×t_n); Where V_target is the target driving voltage for the pixel, A is the perturbation amplitude (e.g., 5mV), f_perturbation is the perturbation frequency (e.g., 200Hz), and t_n is the time point of the nth frame. Because A is extremely small and f_perturbation is relatively high, the human eye cannot perceive these minute brightness fluctuations between frames. This method helps to disperse the stress accumulation of the TFT under a fixed voltage over a long period.

[0044] Spatial Dimension Perturbation: For a static color block area, the system can employ a "dithering" technique. For example, within a 2x2 pixel block, if the target is to display a pure color with a brightness value of L, the system can fine-tune the brightness values ​​of these four pixels to L+delta, L-delta, L+delta, and L-delta, respectively. Here, delta represents a brightness value offset. By applying +delta and -delta offsets to adjacent pixels, it ensures that their internal TFT transistors do not operate at the same voltage for extended periods, thus mitigating aging. For example, L=100 and delta=1; the brightness of the 2x2 pixel block is set to: 101, 99, 101, 99; the average brightness successfully remains L. Alternatively, a more complex dithering matrix can be used, but the average brightness of these four pixels is still L. For example, for a pixel with a target brightness of 100, its adjacent pixels can be set to 99 and 101, but the average brightness of the overall area remains 100. These minute differences in spatial brightness are invisible at normal viewing distances, but they effectively prevent individual TFTs from being subjected to the same electrical stress for extended periods, thus addressing the issue of localized aging with clear boundaries caused by displaying a fixed user interface for a long time.

[0045] 4. Principle of aging inhibition: By introducing this continuous, minute dynamic change, the aim is to break the long-term, concentrated stress accumulation of charge carriers within the TFT channel under a fixed electric field strength. This "micro-massage" state can cleverly disperse the static losses originally concentrated on a specific TFT into dynamic, more uniform minute losses. From a physical perspective, this helps to slow down the drift of the TFT threshold voltage and the decrease in carrier mobility, thereby fundamentally and significantly delaying the aging rate of TFTs in these static display areas. TFT aging is mainly due to the intensified charge trapping effect inside its semiconductor material under a fixed electric field for a long time, leading to changes in the conduction characteristics of the transistor. By introducing micro-perturbations, the gate voltage of the TFT is no longer constant but fluctuates continuously within a small range. This fluctuation causes a slight change in the electric field strength inside the TFT, preventing the accumulation of charge at a specific location over a long period of time to form a stable trap. Just like a muscle, if it remains in one position for a long time, it will become stiff, but if it is subjected to minute movements, it can remain active. This dynamic electric field environment makes it difficult for charge traps inside the TFT to form and deepen stably, thereby effectively slowing down the drift rate of the TFT threshold voltage and extending its stable operating life.

[0046] The solution presented in this application effectively disperses voltage stress in the static area of ​​a liquid crystal display (LCD) by applying finely controlled perturbations to the driving voltage in both temporal and spatial dimensions. Specifically, the temporal perturbation mode introduces minute fluctuations in the driving voltage between consecutive display frames at frequencies and amplitudes imperceptible to the human eye. This prevents liquid crystal molecules from remaining in a single deflection state for extended periods, thus avoiding prolonged exposure to constant electric field stress in specific areas. Simultaneously, the spatial perturbation mode divides the static area into sub-regions and alternately perturbs the driving voltage of adjacent pixels within these sub-regions, strictly maintaining a constant average driving voltage for each adjacent pixel within each sub-region. This ensures that while the voltage of each pixel varies slightly within a local spatial range, the overall perceived brightness remains stable. This coordinated temporal and spatial perturbation effectively disperses voltage stress originally concentrated on specific pixels across a wider temporal and spatial range, significantly slowing down the aging process of the LCD.

[0047] Through the above technical solution, this application can achieve voltage stress dispersion in the static area of ​​an LCD screen in a way that has minimal impact on the user's visual experience. Specifically, by setting both the first preset frequency and the first preset amplitude to be less than corresponding thresholds, it is ensured that the voltage disturbance signal is invisible to the human eye in time. Simultaneously, by perturbing adjacent pixels within a sub-region in the spatial dimension while maintaining their average driving voltage unchanged, the brightness uniformity of the local area is further guaranteed, avoiding visual artifacts caused by the perturbation. Therefore, without sacrificing display quality, the lifespan and stability of the LCD screen are significantly improved, effectively solving the traditional aging problem.

[0048] This application introduces a voltage disturbance signal based on the driving voltage of the aforementioned static region, including: For the static region, a composite spectral perturbation signal containing a main perturbation signal and a diagnostic sub-signal is generated as a voltage perturbation signal; wherein, the main perturbation signal is used to suppress thin-film transistor aging, and the diagnostic sub-signal serves as a diagnostic probe; The composite spectrum perturbation signal is applied to the static region to monitor the electrical feedback caused by the diagnostic sub-signal in the pixel driving circuit, obtain feedback characteristics, compare the feedback characteristics with a preset benchmark, determine the dielectric properties abnormality, and locate the abnormal region. The perturbation signal parameters corresponding to the composite spectral perturbation signal are adaptively adjusted for the abnormal region.

[0049] After applying the composite spectral perturbation signal, feedback characteristics reflecting the pixel's health status can be obtained by monitoring the electrical feedback caused by the diagnostic sub-signal in the pixel driving circuit. The electrical feedback can be pixel current, voltage response, or impedance changes, etc. The feedback characteristics can include the amplitude, phase, and frequency response curve of the response signal, etc. Subsequently, the obtained feedback characteristics are compared with a preset reference. The preset reference is the electrical response characteristics of the pixel driving circuit under normal operating conditions; for example, it can be a reference amplitude and reference phase measured at the factory or under healthy conditions. By comparing, it can be determined whether there is an abnormality in dielectric properties, and the specific abnormal area can be located according to the degree and location of the abnormality. For example, when the actual response amplitude or phase deviates significantly from the preset reference, it can be determined that there is an abnormality in dielectric properties.

[0050] Once the abnormal region is identified and located, this application further adaptively adjusts the perturbation signal parameters corresponding to the composite spectral perturbation signal for the abnormal region. The perturbation signal parameters may include the amplitude, frequency, and waveform of the main perturbation signal, as well as the frequency, phase, and amplitude of the diagnostic sub-signal. The purpose of this adaptive adjustment is to more accurately and effectively compensate for aging problems in specific regions. For example, the amplitude of the main perturbation signal may be increased or its frequency adjusted to more effectively disperse stress, or the parameters of the diagnostic sub-signal may be adjusted for more refined diagnosis.

[0051] Through the above technical solution, this application enables refined management of aging compensation for LCD screens. Compared to solutions that only apply general disturbance signals, this application obtains real-time insight into the electrical characteristics of the pixel driving circuit through diagnostic sub-signals in the composite spectrum disturbance signal, thereby accurately identifying and locating areas of abnormal dielectric properties. This diagnostic capability significantly improves the targeting and effectiveness of aging compensation, allowing the compensation strategy to be adaptively adjusted according to the actual aging condition, avoiding ineffective or over-compensation. Therefore, it can not only more effectively suppress thin-film transistor aging and extend the lifespan of the display screen, but also detect potential hardware faults at an early stage, significantly improving the long-term stability and image quality of the display screen.

[0052] In some preferred embodiments, a specific example is given below. Suppose an LCD screen displays an image with a fixed icon for an extended period, causing the pixels in the icon area (i.e., the static area) to face high voltage stress, potentially leading to thin-film transistor aging and dielectric degradation. In this case, the display controller generates a composite spectral perturbation signal. This signal can be composed of a main perturbation signal for suppressing thin-film transistor aging (e.g., a sine wave with a frequency of 15 kHz and an amplitude of 5 mV) and a diagnostic sub-signal for diagnosis (e.g., a sine wave with a frequency of 120 Hz and an amplitude of 1 mV). This composite spectral perturbation signal is applied to the drive voltage of the static area. During application, the system continuously monitors the electrical feedback in the pixel drive circuit within the static area caused by the 120 Hz diagnostic sub-signal. For example, by measuring the current response of a specific pixel group. If the current response amplitude of a pixel group decreases by 15% compared to a preset health benchmark (e.g., the factory reference amplitude) and the phase drifts by 5 degrees, the system determines that the pixel group has abnormal dielectric properties and marks it as an abnormal area. Once the abnormal region is identified, the system adaptively adjusts the parameters of the composite spectral perturbation signal according to the severity of the anomaly. For example, for this abnormal region, the amplitude of the main perturbation signal might be increased to 8mV to more effectively disperse voltage stress; or, the frequency of the diagnostic sub-signal might be fine-tuned for more precise diagnosis. This adjustment ensures the accuracy and effectiveness of the compensation strategy, thereby more effectively delaying local aging and maintaining the overall performance of the display.

[0053] Specifically, the steps of obtaining feedback features from the electrical feedback caused by the diagnostic sub-signal in the aforementioned monitoring pixel driving circuit, comparing the feedback features with a preset benchmark, determining abnormal dielectric properties, and locating abnormal areas can be further refined into the following operations.

[0054] The preset reference includes a reference amplitude and a reference phase; the electrical feedback caused by the diagnostic sub-signal in the above-mentioned monitoring pixel driving circuit acquires feedback characteristics, compares the feedback characteristics with the preset reference, determines abnormal dielectric properties, and locates abnormal regions, including: The diagnostic sub-signal is applied to any pixel group corresponding to the static region, and the actual response amplitude and actual phase of the pixel group are acquired. The actual response amplitude and actual phase are compared with the reference amplitude and reference phase, respectively, to determine that there is a health abnormality in the thin-film transistor gate dielectric layer of the pixel group, and the coordinates of the pixel group are written into the abnormal region mapping table; the abnormal region mapping table is stored in the internal memory of the display controller.

[0055] The preset reference refers to the electrical feedback characteristics obtained by applying a diagnostic sub-signal and monitoring the pixel drive circuit when the display screen is in a healthy state or has a known specific degree of aging. These characteristics typically include a reference amplitude and a reference phase. These reference values ​​serve as a benchmark for judging the health status of pixels. The reference amplitude represents the expected response signal strength of a healthy pixel under the excitation of a specific diagnostic sub-signal; the reference phase represents the phase delay of the healthy pixel's response signal relative to the diagnostic sub-signal.

[0056] Specifically, to determine abnormal dielectric properties and locate the abnormal region, it is first necessary to select any pixel group within the static region. This pixel group can be a single pixel or a region consisting of several adjacent pixels. Then, a diagnostic sub-signal is applied to the selected pixel group. Under the excitation of the diagnostic sub-signal, the pixel driving circuit generates corresponding electrical feedback. At this point, the actual response amplitude and actual phase of the pixel group need to be acquired. These actual response values ​​reflect the electrical characteristics of the current pixel group.

[0057] Furthermore, the actual response amplitude is compared with a preset reference amplitude, and the actual phase is compared with a preset reference phase. If there is a significant deviation between the actual response amplitude or the actual phase and the corresponding reference value, it can be determined that the thin-film transistor gate dielectric layer of the pixel group may have a health abnormality. This deviation is usually due to physical or chemical changes in the gate dielectric layer under long-term operation or specific stress, resulting in changes in its dielectric constant, leakage current, and other characteristics, which in turn affect the response of the pixel driving circuit to the diagnostic sub-signal. Once a health abnormality is determined, the coordinate information of the pixel group is written into an abnormal area mapping table. This abnormal area mapping table is used to record the location information of all pixel groups diagnosed with health abnormalities on the display screen, so as to carry out targeted compensation adjustments later. The abnormal area mapping table is usually stored in the memory inside the display controller so that the display controller can quickly access and utilize this information.

[0058] This application's solution introduces diagnostic sub-signals as probes and performs refined monitoring and analysis of the electrical feedback of the pixel driving circuit, thereby achieving an accurate assessment of the health status of the thin-film transistor (TFT) gate dielectric layer. When the dielectric properties of the TFT gate dielectric layer become abnormal due to aging or other reasons, its response characteristics (such as amplitude and phase) to the diagnostic sub-signals will change. By comparing the actually measured response amplitude and phase with the preset reference amplitude and phase under healthy conditions, these subtle changes in electrical properties can be effectively identified, thus determining the abnormality of the dielectric properties. This diagnostic method based on electrical feedback characteristics can provide more direct and sensitive information on the dielectric layer health status than traditional brightness detection. Furthermore, by recording the coordinates of abnormal pixel groups in an abnormal region mapping table, precise positioning information is provided for subsequent adaptive adjustments, enabling compensation measures to be applied more specifically to the areas that truly need compensation, avoiding excessive intervention in healthy areas.

[0059] Specifically, in this embodiment, the system compares the monitored "probe" sub-signal feedback characteristics (such as amplitude and phase) with a preset normal reference. When a significant attenuation of the amplitude or an abnormal phase shift is detected in a specific "probe" sub-signal, the system determines that the health of the thin-film transistor gate dielectric layer of that pixel group is problematic, meaning the effectiveness of the micro-perturbation signal in that area may have decreased. The system accurately records the location of these abnormal areas. The "diagnostic logic unit" inside the display controller stores the ideal response amplitude A_ideal(f_probe) and phase φ_ideal(f_probe) for each probe frequency under a healthy thin-film transistor. For each monitored pixel group, the system calculates the actual response amplitude A_actual(f_probe) and phase φ_actual(f_probe) of its probe signal. Attenuation Judgment: If A_actual(f_probe) < A_ideal(f_probe) (1 - Threshold_A) or |φ_actual(f_probe) - φ_ideal(f_probe)| > Threshold_φ, then the region is determined to have abnormal dielectric properties. Threshold_A and Threshold_φ are preset tolerance thresholds, for example, Threshold_A = 10% and Threshold_φ = 5 degrees. The pixel coordinates of the abnormal region are recorded in an "abnormal region mapping table," which can be stored in the display controller's internal memory (such as Static Random Access Memory (SRAM) or Electrically Erasable Programmable Read-Only Memory (EEPROM). By quantizing and comparing the actual response with the ideal response, it is possible to objectively determine whether the dielectric layer has changed. This judgment is based on physical principles and can directly reflect the effectiveness of micro-perturbation signals. Precise region positioning provides the basis for subsequent adaptive adjustments.

[0060] This application further proposes that the main disturbance signal in the above-mentioned composite spectrum disturbance signal is a high-frequency, low-amplitude sine wave or pseudo-random noise signal; the diagnostic sub-signal is one or more low-amplitude signals with specific frequencies and phases.

[0061] Specifically, the main disturbance signal is designed as a high-frequency, low-amplitude sine wave or pseudo-random noise signal. "High frequency" means its frequency is much higher than the human eye's perception threshold for brightness changes, typically in the range of several kilohertz to tens of kilohertz, to ensure that the disturbance does not cause noticeable flickering or brightness fluctuations when applied to the user. Furthermore, "low amplitude" means its voltage amplitude is relatively small, typically in the range of tens to hundreds of millivolts, aiming to avoid interfering with the normal display function of the liquid crystal display while providing sufficient energy to disperse the voltage stress on the thin-film transistor, thereby effectively suppressing the aging effect of the thin-film transistor. As a preferred embodiment, the sine wave signal has the advantages of concentrated spectrum and ease of generation and control, while the pseudo-random noise signal has a wider spectrum distribution, capable of more comprehensively disturbing the operating state of the thin-film transistor, further improving the aging suppression effect.

[0062] The diagnostic sub-signals are designed as one or more low-amplitude signals with specific frequencies and phases. Specifically, "specific frequencies and phases" means that the frequencies and phases of these signals are pre-set and distinct from the spectrum of the main disturbance signal or other environmental noise, so that they can be clearly separated from background noise when monitoring electrical feedback. Simultaneously, "low amplitude" is also to avoid interfering with normal display and to ensure that it does not have an excessive impact on the pixel driving circuit when used as a diagnostic probe. Therefore, by introducing one or more such diagnostic sub-signals, changes in dielectric properties in the pixel driving circuit can be accurately detected, thereby achieving accurate identification and location of abnormal areas.

[0063] This application addresses the problem of inappropriate signal selection leading to poor performance in composite spectrum perturbation signal applications by clearly defining the specific forms of the main perturbation signal and the diagnostic sub-signal. Specifically, setting the main perturbation signal as a high-frequency, low-amplitude sine wave or pseudo-random noise signal ensures efficient application of a small and continuous voltage perturbation to the thin-film transistor (TFT) without affecting the user's visual experience. This perturbation effectively disperses charge accumulation within the TFT, thereby dispersing voltage stress, delaying TFT threshold voltage drift, and suppressing aging. Simultaneously, setting the diagnostic sub-signal as a low-amplitude signal with a specific frequency and phase allows it to act as an independent probe, generating identifiable electrical responses in complex pixel driving circuits. These specific frequency and phase signals can penetrate the pixel dielectric layer and generate different feedback characteristics based on the dielectric layer's health condition, enabling the system to accurately capture weak signal changes caused by dielectric anomalies, thus achieving accurate diagnosis and location of abnormal areas.

[0064] In some preferred embodiments, as a specific implementation, the main disturbance signal can be a sine wave signal with a frequency of 10kHz and an amplitude of 50mV, superimposed on the driving voltage of the static region. This high-frequency characteristic makes the brightness change it causes imperceptible to the human eye, while the low amplitude ensures minimal interference to normal display. Simultaneously, the diagnostic sub-signal can be a sine wave signal with a frequency of 1kHz and an amplitude of 10mV, with its phase offset by 90 degrees from the main disturbance signal. When dielectric characteristic diagnosis is required, this diagnostic sub-signal is injected into the pixel driving circuit. The system can determine whether there is an abnormality in the pixel dielectric layer by monitoring the resulting electrical feedback (e.g., the amplitude and phase of the response signal). For example, if the amplitude or phase of the feedback signal deviates significantly from a preset reference, it indicates that there may be a dielectric characteristic abnormality in the pixel area, requiring further processing. In this way, effective suppression of thin-film transistor aging and accurate diagnosis of dielectric characteristic abnormalities can be achieved.

[0065] This application further proposes a step for adaptively adjusting the disturbance signal parameters corresponding to the composite spectral disturbance signal in the aforementioned abnormal region, including: Obtain the current ambient light intensity and the user's viewing distance, and calculate the human eye brightness change perception threshold based on the ambient light intensity and the user's viewing distance; The amount of change in the disturbance signal parameter to be adjusted is compared with the human eye brightness change perception threshold to control the adjustment range of the disturbance signal parameter. Based on the historical adjustment data of the disturbance signal parameters, determine whether the disturbance signal parameters exceed the safety limit and trigger an early warning.

[0066] Specifically, ambient light intensity can be collected in real time by the ambient light sensor built into the display device, while the user's viewing distance can be obtained through a distance sensor, a camera combined with image recognition technology, or manual input by the user. The human eye's brightness change perception threshold refers to the minimum amount of brightness change that the human eye can detect, and its magnitude is closely related to ambient light intensity and viewing distance. For example, in darker environments or when the viewing distance is closer, the human eye is more sensitive to small changes in brightness, thus the perception threshold is lower; conversely, in brighter environments or when the viewing distance is farther, the perception threshold is higher. This threshold can be calculated using a pre-established human eye vision model or a lookup table method.

[0067] The proposed adjustment amount of the disturbance signal parameters refers to the planned adjustment range of parameters such as amplitude or frequency of the composite spectrum disturbance signal when compensating for abnormal regions. This adjustment amount is compared with the calculated human eye brightness change perception threshold to ensure that the adjustment of the disturbance signal parameters does not cause perceptible changes in brightness or color, thereby avoiding adverse effects on the user's viewing experience. If the proposed adjustment amount exceeds the perception threshold, the adjustment range needs to be limited or implemented in stages to ensure the smoothness and imperceptibility of the adjustment process.

[0068] In practical applications, historical adjustment data of disturbance signal parameters can be stored in the internal memory of the display controller to record the adjustment trajectory and range of disturbance signal parameters over a period of time. The safety upper limit refers to the maximum permissible value of the disturbance signal parameter while ensuring normal operation of the display screen and preventing damage to components. By comparing the current disturbance signal parameter with historical data and determining whether it exceeds the preset safety upper limit, performance degradation or hardware damage caused by over-adjustment can be effectively prevented. Once a parameter is detected to be about to exceed or has already exceeded the safety upper limit, the system will trigger an early warning mechanism, such as through software interface prompts, log recording, or stopping further adjustments, to remind the system administrator or user to take appropriate measures.

[0069] This application's solution optimizes the adaptive adjustment process of composite spectrum disturbance signals by incorporating historical adjustment data on ambient light intensity, user viewing distance, and disturbance signal parameters. By considering the human eye's perception of brightness changes, the adjustment of disturbance signal parameters can be performed without affecting the user's visual experience, avoiding problems such as visible flicker or uneven brightness that may occur in traditional solutions. Simultaneously, by monitoring the historical adjustment data of disturbance signal parameters and setting a safety upper limit, the stability and safety of the compensation process are ensured, effectively preventing potential damage to the display hardware due to over-compensation, thereby extending the display's lifespan.

[0070] Through the above technical solution, more intelligent and user-friendly adaptive adjustment of disturbance signal parameters can be achieved when compensating for aging in abnormal areas of an LCD screen. This solution not only effectively disperses voltage stress in the static areas of the LCD screen and suppresses thin-film transistor aging, but more importantly, it ensures that the compensation process is imperceptible to the user, significantly improving the viewing experience. Furthermore, by monitoring the disturbance signal parameters for safety, the long-term stable operation and hardware security of the display screen are further guaranteed, avoiding secondary problems caused by improper compensation, thereby improving the practicality and reliability of the entire aging compensation control method.

[0071] In some preferred embodiments, a specific example is given below. Suppose that after displaying a static image for an extended period, a certain area of ​​an LCD screen is diagnosed as an abnormal area, requiring adjustment of the parameters of a composite spectral perturbation signal. In this case, the display controller first obtains the current ambient light intensity as 50 lux (lx) using a built-in ambient light sensor and detects the user's viewing distance as 50 centimeters (cm) using a distance sensor. Based on a preset human eye vision model, the system calculates the human eye's brightness change perception threshold under the current conditions to be 0.5 nits (nit). Subsequently, the system needs to adjust the amplitude of the composite spectral perturbation signal in this abnormal area, with a proposed amplitude change of 0.8 nits. Since 0.8 nits is greater than the human eye's brightness change perception threshold of 0.5 nits, the system will control the adjustment magnitude, for example, by dividing the adjustment into two parts, each adjusting by 0.4 nits, or by directly limiting the adjustment magnitude to within 0.5 nits, to ensure that the user cannot perceive the brightness change. Simultaneously, the system will query the historical adjustment data of the perturbation signal parameters. Suppose historical data shows that the maximum safe limit for this parameter is 10 volts (V), and the currently adjusted parameter value is expected to be 9.5V. The system determines that 9.5V does not exceed the safe limit, therefore allowing adjustment. If the adjusted parameter value is expected to reach 10.2V, the system will trigger a warning, for example, displaying a message "Disturbance parameter is approaching the safe limit" on the diagnostic interface of the display controller, and suggesting that the operator check or limit further adjustments, thereby effectively avoiding irreversible damage to the thin-film transistor or liquid crystal layer due to excessively high parameters.

[0072] In some embodiments described above in this application, static areas with a fixed brightness for a long period of time in the liquid crystal display screen are determined by analyzing multiple consecutive frames of displayed images, and voltage disturbance signals are introduced for compensation. However, in actual display environments, the display screen may be affected by various environmental noises or internal system noises. These noises may lead to misjudgments of the time series of pixel brightness or color values, thereby affecting the accuracy of static area identification and reducing the accuracy and effectiveness of aging compensation.

[0073] In this regard, the LCD liquid crystal display screen aging compensation control method further proposed in this application also includes: The non-display area of ​​the liquid crystal display screen is set as a noise reference area; the non-display area includes the screen bezel pixel strip or the solid color image captured during vertical blanking. Frequency domain analysis is performed on the pixel sequence of the noise reference area to identify high-frequency noise components with significant energy that are higher than the display refresh rate and their corresponding amplitudes, and a dynamic model of the current environmental noise is constructed. Based on the dynamic model, an adaptive digital filter is applied to the time series of brightness or color values ​​of each pixel in the static region for noise reduction; the center frequency of the filter is dynamically adjusted according to the high-frequency noise components. Calculate the fluctuation range of the denoised pixel sequence.

[0074] Specifically, setting a non-display area of ​​the LCD screen as a noise reference area means using areas on the screen that do not actually display content to collect environmental or system noise data. Non-display areas typically include the screen bezel pixel band or solid color images captured during vertical blanking. The purpose of selecting these areas as noise reference areas is to obtain clean noise signals and avoid interference from displayed content in noise analysis. The screen bezel pixel band refers to the pixels at the edge of the display area; these pixels are typically not used to display image content visible to the user. Solid color images captured during vertical blanking refer to the brief display of a solid color (such as pure black or pure white) during the display refresh cycle, when the electron beam returns from the bottom of the screen to the top in preparation for the next frame. Pixel data is collected during this period to obtain noise samples free from content interference.

[0075] Frequency domain analysis of the pixel sequence in the noise reference area involves converting the collected pixel brightness or color value time series data to the frequency domain using mathematical methods such as Fourier transform to reveal the various frequency components contained within. This analysis can identify high-frequency noise components with significant energy above the display refresh rate and their corresponding amplitudes. These high-frequency noises may originate from power supply ripple, backlight drive circuits, electromagnetic interference, etc., and typically possess specific frequency characteristics. Based on these identified noise frequency components and amplitudes, a dynamic model of the current environmental noise can be constructed. This model can reflect the characteristics and intensity of the noise in real time, providing a basis for subsequent noise reduction processing.

[0076] In practical applications, based on the dynamic model, an adaptive digital filter is applied to denoise the time series of brightness or color values ​​for each pixel in the static region. An adaptive digital filter is a filter that automatically adjusts its parameters according to the statistical characteristics of the input signal. Its advantage lies in effectively removing noise while preserving the useful information of the original signal to the maximum extent. The center frequency of the filter is dynamically adjusted according to the high-frequency noise components, meaning that the filter can precisely and specifically filter out the main noise frequencies in the current environment, thereby improving the denoising effect. After denoising, the fluctuation range of the denoised pixel sequence is calculated. This fluctuation range more accurately reflects the actual changes in pixel brightness or color values, rather than fluctuations caused by noise.

[0077] The solution presented in this application establishes a noise model in non-display areas, enabling the separation of display content from noise. The identified high-frequency noise components are used to guide the design of an adaptive digital filter, allowing the filter to precisely and specifically remove this noise while preserving the original information of the display content to the maximum extent. Therefore, when analyzing pixel sequences in static areas, the fluctuation range of their brightness or color values ​​over time more accurately reflects actual content changes rather than noise interference, thus providing a more reliable data foundation for subsequent static area determination.

[0078] Through the above technical solution, this application can effectively identify and suppress noise in the display environment, significantly improving the accuracy and robustness of static area identification. This helps avoid misjudgments caused by noise, ensuring that the aging compensation strategy can accurately apply to the areas that truly need compensation, thereby improving the overall effect of LCD screen aging compensation, extending the lifespan of the display screen, and maintaining the long-term stability and consistency of the displayed image.

[0079] In some preferred embodiments, a dedicated module in the display controller can be configured to acquire pixel data of a pure black or pure white image from the screen bezel pixel strip during each vertical blanking period. This data is then subjected to Fast Fourier Transform (FFT) analysis to identify specific high-frequency noise components, such as power supply ripple (e.g., 50Hz or 60Hz and their harmonics) or noise generated by the backlight driver. Based on these identified noise frequencies and amplitudes, a real-time noise dynamic model can be constructed. Subsequently, before performing static region analysis on the pixel data of the display area, the time series of brightness or color values ​​of these pixels are input into an adaptive digital filter. The center frequency of this filter is adjusted in real time according to the high-frequency noise components identified in the dynamic model to accurately filter out noise. The denoised pixel sequence is then used to calculate its fluctuation range, thereby more accurately determining whether a pixel is in a static state.

[0080] Specifically, the steps for determining the static area with a fixed brightness for a long time in the liquid crystal display screen can be further refined as follows.

[0081] The process of determining a static region with a fixed brightness over a long period in the liquid crystal display screen includes: comparing the fluctuation range with a preset stability threshold; if the fluctuation range is less than the preset stability threshold, the pixel sequence is determined to be a static pixel; when all pixels in a continuous pixel region are determined to be static pixels, the pixel region is marked as a static region. The fluctuation range refers to the magnitude of the brightness or color value change of a specific pixel or pixel sequence over a period of time after noise reduction processing. This fluctuation range reflects the stability of pixel content over time. The preset stability threshold is a pre-set value used to define whether pixel content is sufficiently stable to be considered static. This threshold can be adjusted according to the actual application scenario, display characteristics, and sensitivity requirements for determining static regions. For example, it can be set according to the human eye's perception limit of brightness changes to ensure that small fluctuations within the threshold range are not perceived by the human eye. A static pixel refers to a pixel whose brightness or color value fluctuation range is less than the preset stability threshold after noise reduction processing. This means that the pixel appears to remain visually fixed for a long period. A continuous pixel region refers to a set of pixels that are spatially adjacent on the display screen and form a whole. When all pixels in a contiguous region are determined to be static pixels, that region is marked as a static region. This means that the entire region visually displays fixed and unchanging content.

[0082] This application's solution, by introducing a comparison between the fluctuation range and a preset stability threshold, can accurately identify areas on the display screen with truly long-term fixed brightness. First, by denoising the pixel sequence and calculating its fluctuation range, interference from environmental and internal system noise on pixel stability judgment can be effectively eliminated, allowing the fluctuation range to more accurately reflect the actual changes in pixel content. Then, by comparing this fluctuation range with the preset stability threshold, it is possible to objectively determine whether a single pixel is in a static state. Furthermore, by identifying continuous pixel regions, it ensures that the determined static regions are spatially continuous, thereby avoiding misjudging scattered, non-continuous static pixels as static regions requiring compensation. This method, based on fluctuation range and continuity determination, can effectively distinguish between truly static display content and transient, random pixel changes.

[0083] The above technical solution enables accurate identification of static areas with consistently high brightness in LCD screens. This method, based on the fluctuation range of the pixel sequence after noise reduction, effectively avoids misjudgments caused by noise interference or transient content changes in traditional methods, improving the accuracy and reliability of static area identification. Consequently, areas requiring aging compensation can be located more precisely, allowing subsequent voltage disturbance compensation to more effectively target the actual static areas, thereby enhancing the compensation effect and extending the lifespan of the display screen.

[0084] This application also discloses an LCD screen aging compensation control system, such as... Figure 2 As shown, the system includes: The determining module 201 is used to determine a static region with a fixed brightness for a long time in the liquid crystal display screen based on the analysis of multiple consecutive frames of displayed images; the static region corresponds to a driving voltage. Disturbance module 202 is used to introduce a voltage disturbance signal based on the driving voltage of the static region; The compensation control module 203 is used to control the compensation of the driving voltage according to the voltage disturbance signal, so as to disperse the voltage stress in the static area of ​​the liquid crystal display screen; the voltage disturbance signal includes signal amplitude and signal frequency.

[0085] The LCD screen aging compensation control system disclosed in this application, through its modular design, can efficiently identify static areas in the LCD screen and selectively introduce voltage disturbance signals to control the compensation drive voltage, thereby effectively dispersing voltage stress in the static areas. This system aims to fundamentally solve the problem of localized aging that occurs when LCD screens display fixed images for extended periods, significantly improving the long-term stability and display uniformity of the screen.

[0086] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for controlling aging compensation of an LCD liquid crystal display screen, characterized in that, The method includes: Based on the analysis of multiple consecutive frames of displayed images, a static region with a fixed brightness for a long period of time is determined in the liquid crystal display screen; the static region corresponds to a driving voltage; A voltage disturbance signal is introduced based on the driving voltage of the static region; The driving voltage is controlled and compensated according to the voltage disturbance signal to disperse the voltage stress in the static area of ​​the liquid crystal display screen; the voltage disturbance signal includes signal amplitude and signal frequency.

2. The LCD liquid crystal display screen aging compensation control method according to claim 1, characterized in that, Introducing a voltage disturbance signal based on the driving voltage of the static region includes: introducing a voltage disturbance signal on the driving voltage of the static region according to a preset disturbance mode; the preset disturbance mode includes a time-dimensional disturbance mode and a spatial-dimensional disturbance mode.

3. The LCD liquid crystal display screen aging compensation control method according to claim 2, characterized in that, The time-dimensional perturbation mode includes: applying a voltage perturbation signal with a first preset frequency and a first preset amplitude to the driving voltage between consecutive display frames, centered on a target voltage value; wherein the first preset frequency is less than a first frequency threshold and the first preset amplitude is less than a first amplitude threshold. The spatial dimension perturbation mode includes: dividing the static region into several sub-regions, controlling the driving voltage of each adjacent pixel in the sub-region to apply a voltage perturbation signal of the first preset amplitude centered on the target voltage value, and ensuring that the average value of the driving voltage of each adjacent pixel in the sub-region remains unchanged.

4. The LCD liquid crystal display screen aging compensation control method according to claim 1, characterized in that, A voltage disturbance signal is introduced based on the driving voltage of the static region, including: For the static region, a composite spectral perturbation signal containing a main perturbation signal and a diagnostic sub-signal is generated as a voltage perturbation signal; wherein, the main perturbation signal is used to suppress thin-film transistor aging, and the diagnostic sub-signal serves as a diagnostic probe; The composite spectrum perturbation signal is applied to the static region to monitor the electrical feedback caused by the diagnostic sub-signal in the pixel driving circuit, obtain feedback characteristics, compare the feedback characteristics with a preset benchmark, determine the dielectric properties abnormality, and locate the abnormal region. The perturbation signal parameters corresponding to the composite spectral perturbation signal are adaptively adjusted for the abnormal region.

5. The LCD liquid crystal display screen aging compensation control method according to claim 4, characterized in that, The preset reference includes a reference amplitude and a reference phase; the electrical feedback caused by the diagnostic sub-signal in the monitoring pixel driving circuit is used to obtain feedback characteristics, compare the feedback characteristics with the preset reference, determine dielectric property abnormalities, and locate abnormal regions, including: The diagnostic sub-signal is applied to any pixel group corresponding to the static region, and the actual response amplitude and actual phase of the pixel group are acquired. The actual response amplitude and actual phase are compared with the reference amplitude and reference phase, respectively, to determine that there is a health abnormality in the thin-film transistor gate dielectric layer of the pixel group, and the coordinates of the pixel group are written into the abnormal region mapping table; the abnormal region mapping table is stored in the internal memory of the display controller.

6. The LCD liquid crystal display screen aging compensation control method according to claim 4, characterized in that, The main disturbance signal is a high-frequency, low-amplitude sine wave or pseudo-random noise signal; the diagnostic sub-signal is one or more low-amplitude signals with specific frequencies and phases.

7. The LCD liquid crystal display screen aging compensation control method according to claim 4, characterized in that, Adaptively adjust the perturbation signal parameters corresponding to the composite spectral perturbation signal for the abnormal region, including: Obtain the current ambient light intensity and the user's viewing distance, and calculate the human eye brightness change perception threshold based on the ambient light intensity and the user's viewing distance; The amount of change in the disturbance signal parameter to be adjusted is compared with the human eye brightness change perception threshold to control the adjustment range of the disturbance signal parameter. Based on the historical adjustment data of the disturbance signal parameters, determine whether the disturbance signal parameters exceed the safety limit and trigger an early warning.

8. The LCD liquid crystal display screen aging compensation control method according to claim 1, characterized in that, The method further includes: The non-display area of ​​the liquid crystal display screen is set as a noise reference area; the non-display area includes the screen bezel pixel strip or the solid color image captured during vertical blanking. Frequency domain analysis is performed on the pixel sequence of the noise reference area to identify high-frequency noise components with significant energy that are higher than the display refresh rate and their corresponding amplitudes, and a dynamic model of the current environmental noise is constructed. Based on the dynamic model, an adaptive digital filter is applied to the time series of brightness or color values ​​of each pixel in the static region for noise reduction; the center frequency of the filter is dynamically adjusted according to the high-frequency noise components. Calculate the fluctuation range of the denoised pixel sequence.

9. The LCD liquid crystal display screen aging compensation control method according to claim 8, characterized in that, The step of determining the static area with a fixed brightness for a long time in the liquid crystal display includes: comparing the fluctuation range with a preset stability threshold; if the fluctuation range is less than the preset stability threshold, then the pixel sequence is determined to be a static pixel; when all pixels in a continuous pixel area are determined to be static pixels, the pixel area is marked as a static area.

10. An aging compensation control system for an LCD liquid crystal display screen, characterized in that, The system includes: The determination module is used to determine a static area with a fixed brightness for a long time in the liquid crystal display screen based on the analysis of multiple consecutive frames of displayed images; the static area corresponds to a driving voltage; The disturbance module is used to introduce a voltage disturbance signal based on the driving voltage of the static region; The compensation control module is used to control the compensation of the driving voltage according to the voltage disturbance signal, so as to disperse the voltage stress in the static area of ​​the liquid crystal display screen; the voltage disturbance signal includes signal amplitude and signal frequency.

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