Method and system for adjusting brightness of liquid crystal display screen

Abstract

The invention provides a liquid crystal display screen brightness adjusting method and system, and relates to the technical field of liquid crystal display equipment management. After the position information of the area is received, the following operations are executed: on the premise that the total power red line is not exceeded, limited power resources are transferred to a pre-brightening area from a non-brightening area, and the improvement of the local physical brightness is realized; and the graphic processing unit predicts the pollution degree of each dark pixel in the area caused by the brightness improvement. Before the image processing unit sends the image signal to the liquid crystal panel, a compensation value equal to the predicted pollution amount is subtracted from an original signal value of each pixel in advance. The pixel signal which is darkened in advance is illuminated by a'supernormally enhanced 'backlight, so that the image which is finally seen by human eyes not only obtains enough brightness, but also keeps the original detail contrast.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid crystal display device management, and in particular to a method and system for adjusting the brightness of a liquid crystal display screen. Background Art

[0002] In portable electronic devices, especially high-performance workstations and tablet computers that rely on battery power, power consumption management of LCD screens is a key technology. In order to obtain the longest possible battery life within the limited battery capacity, such devices usually set a strict upper limit on the power consumption of the entire device and enter the highest level of energy saving when the battery is low. As the main energy consumption unit, the backlight module of the display screen is the primary target of power consumption restriction. Existing LCD screens, especially those using direct backlight technology, divide the backlight into multiple independently controllable areas. In theory, it is possible to fine-tune the light intensity distribution based on the content of the picture, thereby reducing energy consumption while ensuring image quality. However, in some special application scenarios, this power management mechanism will produce irreconcilable contradictions with specific display content.

[0003] The specialist was currently working with a computed tomography (CT) scan of the abdominal cavity. The overall image composition was notable: the majority of the area was composed of bone, fat, and other high-density tissue, appearing bright white or light gray, resulting in a very high average brightness across the entire image. However, the key to diagnosis lay in identifying several suspected microscopic lesions within the liver. These lesions appeared as low-contrast spots that were darker than the surrounding normal liver tissue and had blurred boundaries. To make an accurate diagnosis, the specialist must be able to clearly distinguish the texture differences within these dark areas and the precise boundary between them and the surrounding tissue. Due to the complex and variable ambient lighting conditions within the command post, the specialist noticed that the image displayed on the screen was generally dim, making details in the liver area, in particular, difficult to discern. He first attempted to use the system's standard brightness adjustment function, attempting to increase the overall screen brightness by dragging the brightness bar. However, this did not produce the desired effect. Because the average brightness of the CT image was already high, the backlight unit's power consumption was already very close to the system's 5-watt limit to illuminate the large, brightly lit areas. Therefore, even if the user sets the brightness command to maximum, the power management system, due to the power consumption cap, cannot allocate any more power to the backlight unit. The actual light output of the backlight unit has not increased significantly, and critical dark details on the screen remain shrouded in darkness, making them impossible to observe effectively. At this point, a built-in image enhancement feature of the workstation is activated. This feature is designed to reallocate limited power without changing overall power consumption. It analyzes the image content, identifies the dark area of ​​interest (the liver), and tentatively adjusts the backlight. Specifically, it reduces the drive current of the backlight sub-zones corresponding to non-critical highlight areas in the image (such as bones and surrounding tissue), transferring the saved power to the backlight sub-zone covering the liver, significantly increasing the backlight intensity in this local area. From the perspective of energy conservation, this strategy is reasonable, and total power consumption remains below the 5-watt limit. However, this seemingly ingenious adjustment method raises new problems stemming from the physical limitations of LCD display technology. LCD panels don't emit light themselves. Instead, they form images by controlling the deflection angles of the liquid crystal molecules within them to block or allow backlight from behind. This blocking isn't absolute. When a pixel needs to display a dark color, even if the liquid crystal molecules twist as much as possible to block light, a certain amount of light inevitably "leaks" through. Under normal backlight intensity, this amount of light leakage is minimal, and its impact on the image is negligible. However, in the aforementioned localized enhancement, the backlight intensity below the liver area is raised to a level far exceeding normal. This intense light shines on the LCD pixels responsible for displaying dark details, causing the light leakage to be dramatically amplified. The resulting visual effect presented to the experts is disastrous.The pixels that should have appeared as dark gray lesions now appear as light gray due to the strong light penetration from behind. The normal tissue pixels next to them, which should have been a slightly darker gray, also became a nearly indistinguishable light gray due to the same light leakage. The difference in brightness between the lesion and the surrounding tissue, or the contrast, was completely destroyed. What the experts saw was no longer a tissue structure with layers and internal textures, but a blurred, "washed out" block of color. Attempts to brighten dark details ultimately resulted in these details disappearing completely due to a loss of contrast. The system was caught in a dilemma: under strict power constraints, existing brightness adjustment methods, whether global or local, could not ensure that dark details could be seen while maintaining the authenticity of the information.

[0004] Therefore, providing a method and system for adjusting the brightness of a liquid crystal display screen for solving the above-mentioned problems is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for adjusting the brightness of a liquid crystal display screen. Without exceeding the total power limit, this method can not only effectively improve the visibility of the target dark area, but also actively compensate for the liquid crystal light leakage effect aggravated by local backlight enhancement, thereby ensuring that the internal contrast and information integrity of key dark details are not destroyed.

[0006] Based on the above objectives, the technical solutions provided by the present invention are as follows:

[0007] A method for adjusting the brightness of a liquid crystal display screen comprises the following steps:

[0008] Specifying a pre-brightened area in a display image, and obtaining an original grayscale value of each pixel in the pre-brightened area under a first backlight intensity;

[0009] According to a preset power allocation table, under the condition that the current total power does not exceed a preset power upper limit, transferring the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area to increase the backlight intensity of the pre-brightened area to the second backlight intensity;

[0010] Calculating and obtaining a grayscale compensation value corresponding to the light leakage increment for offsetting the light leakage increment according to the second backlight intensity, the original grayscale value of each pixel, and a preset leakage characteristic table;

[0011] The original grayscale value of each pixel is corrected according to the grayscale compensation value to obtain a corrected grayscale value of each pixel, and the corrected grayscale value is sent to the liquid crystal panel for display under the second backlight intensity.

[0012] Through the above solution, a processing method that combines user-specified local backlight enhancement with pixel signal inverse correction based on preset screen characteristics can actively and accurately offset the physical light leakage caused by increasing local brightness, thereby achieving a significant improvement in the visibility of dark details within a fixed total power consumption limit, while maintaining the original contrast relationship of the image information to protect the integrity of the information.

[0013] Preferably, the step of specifying a pre-brightened area in a display image and obtaining the original grayscale value of each pixel in the pre-brightened area under a first backlight intensity comprises the following steps:

[0014] Upon receiving a user interaction instruction, rendering a detection frame on the top layer of the liquid crystal panel screen, and obtaining the position coordinates and size information of the detection frame in real time;

[0015] According to the position coordinates and size information of the detection frame and a preset backlight partition map, a pre-brightened area in the display image is specified, and the original grayscale value of each pixel in the pre-brightened area under a first backlight intensity is obtained.

[0016] Through the above solution, according to the interactive instructions input by the user, the exploration box is rendered to determine the pre-brightened area required by the user, and the displayed image is divided into the pre-brightened area and the non-brightened area, providing a prerequisite for the subsequent execution of local backlight enhancement.

[0017] Preferably, the step of transferring the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area according to a preset power allocation table, under the condition that the current total power does not exceed a preset power upper limit, so as to increase the pre-brightened area to the second backlight intensity, comprises the following steps:

[0018] Acquire the current power value of the pre-brightened area, the current power value of the non-brightened area, and the current total power according to a preset power allocation table;

[0019] According to the preset power upper limit and the current total power, the power corresponding to the backlight intensity increment is obtained, the power corresponding to the backlight intensity increment in the non-brightened area is transferred to the pre-brightened area, and a PWM duty cycle is sent to increase the pre-brightened area to the second backlight intensity.

[0020] Through the above scheme, a preset power allocation table is introduced to determine the current power and total power corresponding to the pre-brightened area and the non-brightened area, and then, under the condition that the current total power does not exceed the preset power upper limit, the power corresponding to the backlight intensity increment is calculated, and the power corresponding to the backlight intensity increment of the non-brightened area is transferred to the pre-brightened area, so that the brightness of the pre-brightened area can be improved.

[0021] Preferably, the step of calculating and obtaining a grayscale compensation value corresponding to offsetting the light leakage increment according to the second backlight intensity, the original grayscale value of each pixel, and a preset leakage characteristic table comprises the following steps:

[0022] Obtaining a light leakage increment of each pixel under the second backlight intensity according to the PWM duty cycle and the preset leakage characteristic table;

[0023] The grayscale compensation value corresponding to the light leakage increment for offsetting the light leakage increment is calculated and acquired according to the original grayscale value of each pixel and the light leakage increment.

[0024] Through the above scheme, the PWM duty cycle and the preset leakage characteristic table are introduced to predict the degree of "pollution" (i.e., the amount of light leakage) that this brightness increase will cause to each dark pixel in the area. Combined with the original grayscale value of each pixel obtained in the previous step, the corresponding grayscale compensation value is obtained.

[0025] Preferably, the original grayscale value of each pixel is corrected according to the grayscale compensation value to obtain a corrected grayscale value of each pixel, specifically:

[0026] The difference between the original grayscale value of each pixel and the grayscale compensation value is calculated as the corrected grayscale value of each pixel.

[0027] Through the above solution, the original grayscale value is compensated by the grayscale compensation value, and after compensation and correction, it is sent to the liquid crystal panel for display under the second backlight intensity.

[0028] Preferably, after obtaining the current power value of the pre-brightened area, the current power value of the non-brightened area, and the current total power according to a preset power allocation table, the method further includes the following steps:

[0029] Obtaining theoretical required power for increasing the pre-brightened area to a third backlight intensity;

[0030] Obtaining a theoretical raised power for the non-brightened area while keeping the current total power unchanged;

[0031] First, determine whether the theoretical required power is greater than the theoretical raised power;

[0032] If the first judgment result is no, the power corresponding to the backlight intensity increment is obtained according to the preset power upper limit and the current total power, the power corresponding to the backlight intensity increment in the non-brightened area is transferred to the pre-brightened area, and the PWM duty cycle is sent to increase the pre-brightened area to the third backlight intensity.

[0033] Preferably, after the first step of determining whether the theoretical required power is greater than the theoretical raised power, the method further includes the following steps:

[0034] If the first judgment result is yes, it is defined as being in a power deficit state, and a theoretical power deficit value is obtained according to the theoretical required power and the theoretical raised power;

[0035] Encapsulating the theoretical power shortfall as a power increase budget value into a temporary power budget increase request and sending the request;

[0036] After receiving the temporary power budget increase request, secondly determining whether the sum of the power increase budget value and the current total power is less than the preset power upper limit;

[0037] If the second judgment result is yes, increasing the current total power to a temporary total power;

[0038] The temporary total power is the sum of the power boost budget value and the current total power.

[0039] Preferably, after the current total power is increased to the temporary total power if the second judgment result is yes, the following steps are further included:

[0040] thirdly, determining whether the temporary total power is greater than the theoretical required power;

[0041] If the third judgment result is yes, the power corresponding to the backlight intensity increment is obtained according to the preset power upper limit and the temporary total power, the power corresponding to the backlight intensity increment in the non-brightened area is transferred to the pre-brightened area, and the PWM duty cycle is sent to increase the pre-brightened area to the third backlight intensity.

[0042] Through the above solution, a "supply and demand balance pre-review" step is added before the existing power reallocation logic. This step is responsible for performing a feasibility calculation for the upcoming operation before performing the actual power adjustment. When the calculation results show that the power that can be raised from the non-explored area cannot meet the needs of the explored area, a "power deficit" occurs. This review step will trigger a mechanism to apply to a higher-level power management system for a temporary increase in the total power budget of the backlight module. After the budget is approved and increased, the original power reallocation operation will be executed. This concept aims to establish a dynamic power negotiation mechanism that can intelligently arbitrate between conventional energy saving and mission-critical performance.

[0043] Preferably, after the step of obtaining the power corresponding to the backlight intensity increment based on the preset power upper limit and the temporary total power if the third judgment result is yes, transferring the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area, and sending a PWM duty cycle to increase the backlight intensity in the pre-brightened area to the third backlight intensity, further comprising the following steps:

[0044] Fourth, determining whether the exploration frame is moved, canceled, or has not been operated for a long time;

[0045] If any of the fourth determination results is yes, sending a temporary power budget cancellation request;

[0046] After receiving the temporary power budget cancellation request, the temporary total power is reduced to the current total power.

[0047] Through the above solution, an energy-saving mechanism is introduced. When the exploration frame is moved, canceled, or has no operation for a long time, the temporary power budget increased in the previous step is canceled and the system switches to low-power operation to continue to maintain long battery life for the device.

[0048] A liquid crystal display brightness adjustment system, comprising:

[0049] an area determination module, configured to specify a pre-brightened area in a display image and obtain an original grayscale value of each pixel in the pre-brightened area under a first backlight intensity;

[0050] a backlight intensity boosting module, configured to transfer, according to a preset power allocation table and provided that the current total power does not exceed a preset power upper limit, the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area, so as to boost the backlight intensity in the pre-brightened area to a second backlight intensity;

[0051] a compensation value determination module, configured to calculate and obtain a grayscale compensation value corresponding to offsetting the light leakage increment according to the second backlight intensity, the original grayscale value of each pixel, and a preset leakage characteristic table;

[0052] The pixel correction module is used to correct the original grayscale value of each pixel according to the grayscale compensation value to obtain a corrected grayscale value of each pixel, and send the corrected grayscale value to the liquid crystal panel for display under the second backlight intensity.

[0053] The present invention also provides a liquid crystal display brightness adjustment system, which has the same technical concept as this method, solves the same technical problem, and should have the same beneficial effects, so it will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0055] Figure 1 A flow chart of a method for adjusting brightness of a liquid crystal display provided by an embodiment of the present invention;

[0056] Figure 2 A flowchart of step S1 provided in an embodiment of the present invention;

[0057] Figure 3 A flowchart of step S2 provided in an embodiment of the present invention;

[0058] Figure 4 A flowchart of step S3 provided in an embodiment of the present invention;

[0059] Figure 5 A flowchart after step B1 provided for an embodiment of the present invention;

[0060] Figure 6 A flowchart after step D3 provided in an embodiment of the present invention;

[0061] Figure 7 A flowchart after step E4 provided for an embodiment of the present invention;

[0062] Figure 8 A flowchart after step F2 provided for an embodiment of the present invention;

[0063] Figure 9 This is a structural diagram of a liquid crystal display brightness adjustment system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0064] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0065] The embodiments of the present invention are written in a progressive manner.

[0066] For a portable LCD display operating within a preset total power consumption limit, when displaying an image with both large highlight areas and low-contrast dark areas containing critical information, how can a brightness adjustment method be designed? This method, guided by user interaction, combines the local backlight output intensity with the display data of the corresponding LCD area. This method effectively enhances the visibility of the target dark area while actively compensating for the liquid crystal light leakage effect exacerbated by the local backlight enhancement, without exceeding the total power limit. This ensures that the internal contrast and information integrity of the critical dark details are not compromised.

[0067] This solution differs from existing technologies in that it employs a processing method that combines user-specified local backlight enhancement with inverse correction of pixel signals based on preset screen characteristics. This method actively and precisely offsets the physical light leakage caused by increasing local brightness, thereby significantly improving the visibility of dark details within a fixed total power consumption limit while maintaining the original contrast relationship of the image information.

[0068] like Figure 1 As shown, a method for adjusting the brightness of a liquid crystal display screen includes the following steps:

[0069] S1. Specify a pre-brightened area in the display image and obtain the original grayscale value of each pixel in the pre-brightened area under the first backlight intensity;

[0070] S2. According to the preset power allocation table, under the condition that the current total power does not exceed the preset power upper limit, the power corresponding to the backlight intensity increment in the non-brightened area is transferred to the pre-brightened area to increase the pre-brightened area to the second backlight intensity;

[0071] S3. Based on the second backlight intensity, the original grayscale value of each pixel and the preset leakage characteristic table, the grayscale compensation value corresponding to the incremental light leakage is calculated and obtained;

[0072] S4. Correcting the original grayscale value of each pixel according to the grayscale compensation value to obtain a corrected grayscale value of each pixel, and sending the corrected grayscale value to the liquid crystal panel for display under the second backlight intensity.

[0073] The specific workflow of the present invention forms a closed-loop compensation system driven by user intent as follows: The user explicitly indicates the image region of interest (i.e., the pre-brightened area) to the system by moving the interactive tool "explorer box." Upon receiving the location of this region, the system immediately performs two parallel operations: First, it instructs the backlight controller to transfer limited power resources from the non-brightened area to the pre-brightened area, while staying within the total power limit, thereby increasing the physical brightness of that area. Second, it notifies the graphics processing unit (GPU) that a physical brightness change is about to occur in that area. Based on a pre-stored data table describing the screen's "light leakage characteristics" and a PWM duty cycle signal corresponding to the backlight intensity increment calculated based on a preset power cap and the current total power, the GPU predicts the degree of "contamination" (i.e., light leakage increment) that will result from increasing the backlight intensity from a first backlight intensity to a second backlight intensity for each dark pixel in that area. To eliminate this contamination, the GPU subtracts a compensation value equal to the predicted contamination amount from the original signal value of each pixel before sending the image signal to the LCD panel. Ultimately, the "pre-dim" pixel signal is illuminated by a "super-enhanced" backlight. The two effects cancel each other out, so that the image finally seen by the human eye has sufficient brightness while maintaining the original detail contrast, thus solving the observation problem under limited conditions.

[0074] The above solution closely addresses scenario-specific characteristics and transforms them into its core advantages: It responds to the interactivity of user workflows: The "exploration box" tool in the solution perfectly aligns with the diagnostician's habit of moving their visual focus for exploration. It transforms a complex global optimization problem into a simple, efficient, localized observation task driven directly by user intent, seamlessly integrating technical assistance with the human workflow. It adapts to the extreme limitations of energy supply: This method increases power consumption only when the user needs it, and only in a small area of ​​the screen, creating an extremely energy-efficient "on-demand" strategy. Once the exploration is completed or the exploration box is removed, power consumption in that area immediately returns to baseline, fully meeting the energy-conscious requirements of field rescue operations. It respects the limited computing resources of portable devices: The solution avoids computationally intensive paths that require complex analysis of the entire image. Its core calculations are limited to a small range of pixels within the exploration box, relying primarily on pre-set data table lookups and basic subtraction operations. This lightweight processing ensures instant responsiveness and meets the stringent efficiency requirements of emergency diagnosis.

[0075] like Figure 2 As shown, preferably, specifying a pre-brightened area in a display image and obtaining the original grayscale value of each pixel in the pre-brightened area under a first backlight intensity includes the following steps:

[0076] A1. Upon receiving a user interaction command, a detection frame is rendered on the top layer of the LCD panel screen, and the position coordinates and size information of the detection frame are obtained in real time.

[0077] A2. Based on the position coordinates and size information of the detection frame and the preset backlight partition map, a pre-brightened area in the display image is specified, and the original grayscale value of each pixel in the pre-brightened area under the first backlight intensity is obtained.

[0078] Steps A1 to A2 of the above scheme are specific implementation details of step S1. The scheme receives interactive instructions from the user, renders a detection frame on the top layer of the LCD panel screen, collects the position coordinates and size information of the detection frame in real time, specifies the pre-brightened area in the displayed image through the position coordinates and size information of the detection frame, and collects the original grayscale value of each pixel in the pre-brightened area under the first backlight intensity.

[0079] Grayscale, also known as grayscale, refers to the range of brightness values ​​for each pixel when converting a color image to black and white in computer image processing. Simply put, grayscale refers to the brightness level corresponding to the grayscale value of each pixel in the image. For example, black corresponds to a grayscale value of 0, white corresponds to a grayscale value of 255, and all gray tones in between have different grayscale values, which are represented as 8-bit binary numbers in the computer. Grayscale allows us to represent images more precisely by describing the brightness level of each pixel in the image. In a grayscale image, black and white represent different brightness values ​​in the image. Rendering grayscale images is often used in medical imaging or facial image processing. By utilizing different grayscale values, operations such as image enhancement, segmentation, and denoising can be achieved, which has important application value in the fields of image processing and computer vision.

[0080] In some preferred embodiments, the above steps are implemented by a graphical user interface (GUI) service module running on the device's main processor. When the user activates this function via a specific shortcut key or interface button, the service module instructs the graphics processing unit (GPU) to render a semi-transparent rectangular box on top of the screen. The service module monitors input device events provided by the operating system (such as mouse movement and touch drag) to obtain the screen coordinates (e.g., the coordinates of the upper left corner vertex (X, Y)) and dimensions (width W, height H) of the exploration box in real time. This position and size information is continuously sent to a dedicated display control unit, which has a fixed layout map of the backlight partitions, which records the precise coordinate range of each independent backlight partition on the screen. The control unit compares the received exploration box coordinates (X, Y, W, H) with the layout map to quickly determine the covered backlight partitions (e.g., the four partitions from row 3, column 5 to row 4, column 6) and collects the original grayscale value of each pixel in this area.

[0081] like Figure 3 As shown, preferably, according to a preset power allocation table, under the condition that the current total power does not exceed a preset power upper limit, the power corresponding to the backlight intensity increment in the non-brightened area is transferred to the pre-brightened area to increase the pre-brightened area to the second backlight intensity, including the following steps:

[0082] B1. Obtain the current power value of the pre-brightened area and the current power value of the non-brightened area and the current total power according to the preset power allocation table;

[0083] B2. Based on the preset power cap and the current total power, obtain the power corresponding to the backlight intensity increment, transfer the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area, and send a PWM duty cycle to increase the pre-brightened area to the second backlight intensity.

[0084] Steps B1 to B2 of the above scheme are the specific implementation details of step S2, which is to obtain the current power value of the pre-brightened area and the current power values ​​of other non-brightened areas and the total power value through a preset power allocation table (used to allocate power to each area displayed by the LCD panel through a built-in program); combined with the preset power upper limit, the power corresponding to the backlight intensity enhancement is calculated, and the power corresponding to the backlight intensity increment in the non-brightened area is transferred to the pre-brightened area, and the PWM duty cycle is generated and sent to increase the pre-brightened area to the second backlight intensity.

[0085] In some preferred embodiments, when the system identifies that the search box covers the four backlight zones (6, 7, 8, and 9) at the bottom of the screen, the controller immediately performs a power precalculation: while maintaining a constant total power of 5 watts, it "borrows" a small amount of power from all other zones and supplies it to these four zones, increasing their backlight intensity from the normal 60% to 90%. This power precalculation is performed by a microcontroller (MCU, such as an STM32 series chip), which has a built-in simplified power allocation table. By querying the power allocation table, the current power of the covered backlight zone and the current power of the non-brightened zone are determined. The total power is 4.8 watts, and the total power limit is 5 watts. The goal is to increase the power of each of the four selected zones by 0.05 watts, for a total of 0.2 watts. The MCU then calculates the power reduction of 0.2 / N watts from each of the remaining N unselected zones. After the calculation is completed, the MCU sends a new set of pulse width modulation (PWM) duty cycle instructions to the backlight driver integrated circuit (IC) through an I2C or SPI serial bus, accurately increasing the drive current of the target partition while reducing the drive current of other partitions to ensure that the instantaneous change in total power does not exceed the 5-watt threshold.

[0086] like Figure 4As shown, preferably, according to the second backlight intensity, the original grayscale value of each pixel and the preset leakage characteristic table, calculating and obtaining the grayscale compensation value corresponding to the light leakage increment for offsetting the light leakage includes the following steps:

[0087] C1. Obtain the light leakage increment of each pixel under the second backlight intensity according to the PWM duty cycle and the preset leakage characteristic table;

[0088] C2. Calculate and obtain a grayscale compensation value corresponding to the light leakage increment for offsetting the light leakage increment based on the original grayscale value of each pixel and the light leakage increment.

[0089] Steps C1 to C2 of the above scheme are the specific implementation details of step S3, which is obtained by obtaining the light leakage increment of each pixel under the second backlight intensity based on the sent PWM duty cycle and the preset leakage characteristic table, and combining the original grayscale value of each pixel to calculate the grayscale compensation value corresponding to the light leakage increment.

[0090] The specific implementation details of step C2 are as follows: according to a preset leakage characteristic table, determining the correspondence between the original PWM duty cycle, the original grayscale value and the light leakage increment; inputting a new PWM duty cycle and the original grayscale value, combining the correspondence, determining and outputting the light leakage increment under the second backlight intensity, and converting the light leakage increment into a grayscale compensation value (in one embodiment, the light intensity of the obtained light leakage increment is converted into a digital signal by performing photoelectric conversion and analog-to-digital conversion through a computer tool, i.e., the grayscale compensation value). If the light leakage increment is not determined according to the correspondence in the leakage characteristic table, the light leakage increment is determined according to the method of trilinear interpolation of adjacent points, and the light leakage increment is converted into a grayscale compensation value accordingly.

[0091] In some preferred embodiments, the graphics processing unit (GPU) also knows that the backlight intensity of sub-zones 7, 8, and 9 is about to reach 90%. The device's LCD panel's optical characteristics are calibrated before shipment, generating a leakage characteristic table describing the relationship between backlight intensity, pixel grayscale value, and light leakage. This table records the amount of unwanted light "leaked" by pixels displaying different grayscales under different backlight intensities. Specifically, it is a three-dimensional lookup table (3D LUT), stored in the device's non-volatile flash memory and loaded into the GPU's dedicated memory area at system startup. The three dimensions of this LUT are: the input backlight driver PWM duty cycle (e.g., 0-255 levels), the input pixel raw grayscale value (e.g., 0-255 levels), and the output grayscale compensation value corresponding to the light leakage increment (i.e., the equivalent grayscale compensation value converted from the light leakage increment through photoelectric conversion and analog-to-digital conversion). When the PWM duty cycle of the target subarea is increased to a new value (for example, from 180 to 230), the GPU processing logic uses the input (230, 40) to find the corresponding output value in the 3D LUT for a pixel within the detection frame with an original grayscale value of 40. If there is no exact corresponding point in the table, a grayscale compensation value, such as 12, is calculated using trilinear interpolation of nearby points. This value, "12," is the grayscale compensation value corresponding to the light leakage increment for this pixel under the given backlight conditions.

[0092] Preferably, the original grayscale value of each pixel is corrected according to the grayscale compensation value to obtain the corrected grayscale value of each pixel, specifically:

[0093] The difference between the original grayscale value of each pixel and the grayscale compensation value is calculated as the corrected grayscale value of each pixel.

[0094] The above steps are specific implementation details of obtaining the corrected grayscale value in step S4, which is obtained by calculating the difference between the original grayscale value of each pixel and the grayscale compensation value obtained in the previous step as the corrected grayscale value of each pixel;

[0095] In some preferred embodiments, this is efficiently accomplished through a shader program executed on the GPU. This shader program is only effective for the pixel area on the screen that coincides with the coordinates of the exploration box. For each pixel in this area, when the shader program encounters a pixel that should be displayed as a dark gray lesion (original grayscale value 40), it consults the "leakage characteristic table" and calculates: "In an environment with a backlight intensity of 90%, a pixel displaying grayscale 40 will leak an additional 15 grayscale units of light." To offset this effect, the GPU performs a simple subtraction: 40-15=25. It then commands this pixel to display a darker gray (grayscale value 25). Similarly, for the adjacent normal tissue pixel with a grayscale value of 50, the GPU calculates that it will leak 14 grayscale units of light, so it executes: 50-14=36.

[0096] This corrected grayscale value is the signal ultimately written into the frame buffer and transmitted to the LCD panel driver IC. The diseased pixels, instructed to display grayscale 25, and the tissue pixels, instructed to display grayscale 36, are illuminated by a 90% boosted backlight. Due to light leakage, their respective brightness levels are "brightened" by approximately 15 and 14 units, respectively. Ultimately, the perceived brightness by the human eye returns to their proper, clearly distinguishable levels of 40 and 50. Pixels outside the detection frame bypass this shader program, and their original grayscale values ​​are transmitted directly to the LCD panel. This entire process is performed in a massively parallel manner within the GPU, ensuring instantaneous response to user actions without any perceptible lag.

[0097] like Figure 5 As shown, preferably, after obtaining the current power value of the pre-brightened area and the current power value of the non-brightened area and the current total power according to the preset power allocation table, the following steps are also included:

[0098] D1. Obtain the theoretical power required to increase the pre-brightened area to the third backlight intensity;

[0099] D2. Obtain the theoretical power raised in the non-brightened area while keeping the current total power constant.

[0100] D3. First, determine whether the theoretical power demand is greater than the theoretical power required;

[0101] D4. If the first judgment result is no, then based on the preset power upper limit and the current total power, obtain the power corresponding to the backlight intensity increment, transfer the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area, and send the PWM duty cycle to increase the pre-brightened area to the third backlight intensity.

[0102] like Figure 6As shown, preferably, after first determining whether the theoretical required power is greater than the theoretical raised power, the following steps are further included:

[0103] E1. If the first judgment result is yes, the power deficit state is defined, and the theoretical power deficit value is obtained based on the theoretical power demand and the theoretical power raised;

[0104] E2. The theoretical power shortage value is encapsulated as a temporary power budget increase request as a power budget increase value and sent;

[0105] E3 after receiving a temporary power budget increase request, the second judgment power increase budget value and the sum of the current total power is less than the preset power limit;

[0106] E4. If the second judgment result is yes, the current total power is increased to a temporary total power;

[0107] The temporary total power is the sum of the power increase budget value and the current total power.

[0108] like Figure 7 As shown, preferably, if the second judgment result is yes, after taking the sum of the power increase budget value and the current total power as the budgeted total power, the following steps are further included:

[0109] F1. Third, determine whether the temporary total power is greater than the theoretical required power;

[0110] F2. If the third judgment result is yes, obtain the power corresponding to the backlight intensity increment based on the preset power upper limit and the temporary total power, transfer the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area, and send a PWM duty cycle to increase the pre-brightened area to the third backlight intensity.

[0111] Steps D1 to D4, E1 to E4, and F1 to F2 of the above-described scheme are applied in a more complex deployment environment. Their inherent limitations become apparent when applied to another specific type of medical image, such as an MRI image of an extremity used to diagnose deep muscle contusions or hematomas. This type of image is characterized by the vast majority of the image being composed of low-signal soft tissue, appearing as a large dark area overall, with only bone and subcutaneous fat appearing as narrow strips of bright areas. Therefore, the image has an extremely low average image level. According to the device's energy-saving strategy, when displaying this low-average image level image, the overall baseline power output of the display backlight module is automatically maintained at a very low level, for example, operating at only 1.5 watts within a total power limit of 5 watts to maximize energy conservation. At this point, the diagnostician moves the exploration frame to an area deep within the thigh muscle group with extremely low signal intensity, suspected of being a hematoma. Based on the image content, to achieve a recognizable luminance for detail in this area, the system calculates that an additional 2.0 watts of power is required for the backlight sub-zone covered by the search frame. The display control unit then performs a power precalculation. It attempts to allocate this 2.0 watts of power from all non-searched areas. However, since the baseline power for the entire screen is only 1.5 watts, and the search frame itself occupies a certain area and has a certain initial power consumption, the total power consumed by all non-searched backlight sub-zones is only 1.2 watts, for example. In this case, the maximum power that the system can reduce and transfer from the non-searched areas is no more than 1.2 watts, far below the target 2.0 watts. The power precalculation results in an unfulfilled request. Ultimately, the system can only allocate the allocated 1.2 watts of power to the target sub-zone. This power increase is insufficient to raise the luminance of the target area to a recognizable level, rendering the search function ineffective for this particular image content.

[0112] Steps D1 to D4, E1 to E4, and F1 to F2 are designed to solve the technical problem of "a portable display device with extremely low backlight reference power due to displaying low average picture level (APL) content under total power-limited conditions. When the user needs to perform local exploration of a dark area that requires a significant brightness increase, how to design a power allocation method that can identify the "power deficit" state in the power pre-calculation stage where the "required additional power" is greater than the "power available in the non-exploration area" and trigger a temporary, controlled global backlight reference power increase mechanism to ensure that the local exploration function can obtain sufficient power support under any image content, and can automatically restore to the original low-power state after the exploration task is completed, thereby achieving a balance between usage performance and overall battery life."

[0113] Steps D1 to D4 are performed after step B1 by obtaining the theoretical power required to raise the pre-brightened area to a level where it can be clearly identified (third backlight intensity); obtaining the theoretically available power (theoretical raised power) for other non-brightened areas while keeping the current total power unchanged; and determining whether the required power is greater than the theoretical raised power. If the first determination result is no, it indicates that the required power is less than the available power, and the conventional power reallocation process is directly entered.

[0114] In steps E1 to E4, when the first judgment result is yes, it is defined as a power deficit state. Based on the theoretical required power and the theoretical raised power, a theoretical power deficit value is calculated, which is packaged as a power increase budget value into a corresponding request task and sent. After receiving the request task, a second judgment is made as to whether the sum of the power increase budget value and the current total power is less than a preset power upper limit. If the second judgment result is yes, the current total power is increased to a temporary total power.

[0115] In steps F1 to F2, after the current total power is increased to the temporary total power, a third determination is made as to whether the temporary total power is greater than the theoretical required power. If the third determination result is yes, the conventional power reallocation process is directly entered.

[0116] In step F2, the power corresponding to the backlight intensity increment is obtained according to the preset power upper limit and the temporary total power. Specifically, the difference between the preset power upper limit and the temporary total power is calculated and used as the power corresponding to the backlight intensity increment.

[0117] The process of executing the above steps is as follows: When the user selects a target area through the exploration box, the processing module in the display control unit first calculates the amount of additional power required to increase the brightness of the area to a clearly recognizable level based on the pixel grayscale distribution of the area and the preset target brightness standard, which is recorded as `P_needed`. For example, the system calculates that an additional 2.0 watts of power is required. At the same time, the processing module analyzes the driving status of the backlight partitions of all non-explored areas on the current screen, and accurately calculates the total power currently consumed by these partitions, which is recorded as `P_available`. This value represents the maximum power that can be "borrowed" in theory without changing the baseline total power. For example, it is calculated that

[0118] `P_available` is 1.2 watts. The processing module performs a key comparison: `if(P_needed>P_available)`. If the condition is not met, it means that the "family assets" are sufficient, and the regular power redistribution process is directly entered. If the condition is met, the system determines that it has entered the "power deficit" state. The processing module immediately calculates the power gap `P_deficit=P_needed-P_available` (in this case, 2.0-1.2=0.8 watts). Subsequently, the processing module sends a "temporary power budget increase request" to the power management integrated circuit (PMIC) on the motherboard through the system bus (such as PMBus or a custom control interface). The request contains two parameters: the target subsystem (backlight module) and the power budget value that needs to be increased (`P_deficit`, that is, 0.8 watts). After receiving the request, the power management integrated circuit (PMIC) verifies whether the request will cause the total power consumption of the entire machine to exceed the safety upper limit. In this scenario, since the baseline power is only 1.5 watts, it increases to 2.3 watts after an increase of 0.8 watts, which is far below the upper limit of 5 watts for the entire machine, and the request is approved. The PMIC then adjusts the voltage or current limit supplied to the backlight module, temporarily increasing its total power budget to the new baseline value `P_new_base = 1.5 + 0.8 = 2.3 watts`. After confirming that the baseline power has been increased, the display control unit re-executes power redistribution. At this point, the available power in the non-exploration area has increased accordingly, and it is determined whether the `P_needed` requirement is met. When this requirement is met, the system successfully cuts 2.0 watts of power from the non-exploration area and applies it to the exploration area, completing effective brightness enhancement.

[0119] In some preferred embodiments, the expert moves the exploration frame to the target dark area. The system calculates that an additional 2.0 watts of power is required, but the non-exploration area can only provide 1.2 watts. The system immediately identifies a 0.8-watt "power deficit." Instead of forcing an ineffective operation, as it would in the past, the display controller sends a request to the main power management system: "To perform a critical diagnostic task, request a temporary 0.8-watt increase in the backlight unit's power budget." The main power system approves the request, raising the backlight unit's total power baseline from 1.5 watts to 2.3 watts. With this new, higher power platform, the display controller can easily mobilize the required 2.0 watts from the non-exploration area and apply it to the exploration frame. As a result, the suspected hematoma area within the exploration frame is fully illuminated, with its details and boundaries clearly visible, enabling a smooth diagnosis. Once the expert moves the exploration frame, the system immediately notifies the main power system of the task completion, and the backlight unit's power baseline automatically drops back to a power-saving 1.5 watt state, maintaining long battery life for the device. In this way, this solution ensures that key diagnostic functions can be reliably performed regardless of image content, while maximizing the overall energy saving advantages of the device.

[0120] like Figure 8 As shown, preferably, if the third judgment result is yes, then according to the preset power upper limit and the temporary total power, the power corresponding to the backlight intensity increment is obtained, the power corresponding to the backlight intensity increment in the non-brightened area is transferred to the pre-brightened area, and the PWM duty cycle is sent to increase the pre-brightened area to the third backlight intensity, and the following steps are further included:

[0121] G1. Fourth, determine whether the exploration box has been moved, canceled, or has not been operated for a long time;

[0122] G2. If any of the fourth judgment results is yes, a temporary power budget cancellation request is sent;

[0123] G3. After receiving the temporary power budget cancellation request, reduce the temporary total power to the current total power.

[0124] Steps G1 to G3 of the above scheme are an automatic power fallback mechanism designed after step F2. It determines whether the probe frame has been moved, canceled, or has not been operated for a long time. If any of the above situations occurs, a temporary power budget cancellation request is sent. After receiving the request, the temporary total power is reduced to the current total power.

[0125] In some preferred embodiments, the display control unit continuously monitors the status of the exploration frame. Once it detects that the exploration frame has been moved, canceled, or has been inactive for an extended period, the system determines that the exploration task has ended. The display control unit immediately sends a "cancel temporary power budget" command to the PMIC. The PMIC then restores the backlight unit's power budget to its normal low power consumption level (1.5 watts), determined by the current image's APL.

[0126] like Figure 9 As shown, a liquid crystal display brightness adjustment system includes:

[0127] an area determination module, configured to specify a pre-brightened area in a display image and obtain an original grayscale value of each pixel in the pre-brightened area under a first backlight intensity;

[0128] a backlight intensity boosting module configured to transfer, according to a preset power allocation table and provided that the current total power does not exceed a preset power upper limit, the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area, thereby boosting the pre-brightened area to a second backlight intensity;

[0129] a compensation value determination module, configured to calculate and obtain a grayscale compensation value corresponding to the light leakage increment for offsetting the light leakage according to the second backlight intensity, the original grayscale value of each pixel, and a preset leakage characteristic table;

[0130] The pixel correction module is used to correct the original grayscale value of each pixel according to the grayscale compensation value to obtain the corrected grayscale value of each pixel, and send the corrected grayscale value to the liquid crystal panel for display under the second backlight intensity.

[0131] Through the above scheme, a liquid crystal display brightness adjustment system is provided. The system uses a modular design to assign area determination, backlight intensity enhancement, compensation value determination, and pixel correction functions to different units, so that the liquid crystal display brightness adjustment method can be effectively and reliably executed.

[0132] In the embodiments provided in this application, it should be understood that the disclosed methods and systems can be implemented in other ways. The system embodiments described above are merely illustrative. For example, the division of modules is merely a logical function division. In actual implementation, there may be other division methods, such as: multiple modules or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0133] In addition, all functional modules in the embodiments of the present invention may be integrated into one processor, or each module may be a separate device, or two or more modules may be integrated into one device; the functional modules in the embodiments of the present invention may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0134] Those skilled in the art will understand that all or part of the steps of the above-mentioned method embodiment can be completed by program instructions and related hardware. The aforementioned program instructions can be stored in a computer-readable storage medium. When the program instructions are executed, the steps of the above-mentioned method embodiment are executed; and the aforementioned storage medium includes: mobile storage devices, read-only memories (ROM), magnetic disks or optical disks, and other media that can store program codes.

[0135] It should be understood that the use of "system," "device," "unit," and / or "module" in this application is merely a method for distinguishing different components, elements, parts, portions, or assemblies at different levels. However, if other terms can achieve the same purpose, the terms may be replaced by other expressions.

[0136] As used herein, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprise" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list; a method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0137] In the following, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0138] If a flow chart is used in this application, the flow chart is used to illustrate the operations performed by the system according to the embodiments of the application. It should be understood that the previous or subsequent operations are not necessarily performed in exact order. Instead, the steps can be processed in reverse order or simultaneously. At the same time, other operations can be added to these processes, or one or more operations can be removed from these processes.

[0139] The above describes in detail the method and system for adjusting the brightness of a liquid crystal display provided by the present invention. The above description of the disclosed embodiments will enable those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to be embodied in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A method for adjusting the brightness of a liquid crystal display, characterized in that: The steps include: Specifying a pre-brightened area in a display image, and obtaining an original grayscale value of each pixel in the pre-brightened area under a first backlight intensity; According to a preset power allocation table, under the condition that the current total power does not exceed a preset power upper limit, transferring the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area to increase the backlight intensity of the pre-brightened area to the second backlight intensity; Calculating and obtaining a grayscale compensation value corresponding to the light leakage increment for offsetting the light leakage increment according to the second backlight intensity, the original grayscale value of each pixel, and a preset leakage characteristic table; The original grayscale value of each pixel is corrected according to the grayscale compensation value to obtain a corrected grayscale value of each pixel, and the corrected grayscale value is sent to the liquid crystal panel for display under the second backlight intensity.

2. The method for adjusting the brightness of a liquid crystal display according to claim 1, wherein: The step of obtaining the original grayscale value of each pixel in the pre-brightened area in the designated display image under the first backlight intensity comprises the following steps: Upon receiving a user interaction instruction, rendering a detection frame on the top layer of the liquid crystal panel screen, and obtaining the position coordinates and size information of the detection frame in real time; According to the position coordinates and size information of the detection frame and a preset backlight partition map, a pre-brightened area in the display image is specified, and the original grayscale value of each pixel in the pre-brightened area under a first backlight intensity is obtained.

3. The method for adjusting the brightness of a liquid crystal display according to claim 2, wherein: The method includes transferring the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area according to a preset power allocation table, under the condition that the current total power does not exceed a preset power upper limit, so as to increase the backlight intensity in the pre-brightened area to the second backlight intensity, comprising the following steps: Acquire the current power value of the pre-brightened area, the current power value of the non-brightened area, and the current total power according to a preset power allocation table; According to the preset power upper limit and the current total power, the power corresponding to the backlight intensity increment is obtained, the power corresponding to the backlight intensity increment in the non-brightened area is transferred to the pre-brightened area, and a PWM duty cycle is sent to increase the pre-brightened area to the second backlight intensity.

4. The method for adjusting the brightness of a liquid crystal display according to claim 3, wherein: The step of calculating and obtaining a grayscale compensation value corresponding to offsetting the light leakage increment according to the second backlight intensity, the original grayscale value of each pixel, and a preset leakage characteristic table comprises the following steps: Obtaining a light leakage increment of each pixel under the second backlight intensity according to the PWM duty cycle and the preset leakage characteristic table; The grayscale compensation value corresponding to the light leakage increment for offsetting the light leakage increment is calculated and acquired according to the original grayscale value of each pixel and the light leakage increment.

5. The method for adjusting the brightness of a liquid crystal display according to claim 4, wherein: The original grayscale value of each pixel is corrected according to the grayscale compensation value to obtain the corrected grayscale value of each pixel, specifically: The difference between the original grayscale value of each pixel and the grayscale compensation value is calculated as the corrected grayscale value of each pixel.

6. The method for adjusting brightness of a liquid crystal display according to claim 3, wherein: After obtaining the current power value of the pre-brightened area, the current power value of the non-brightened area, and the current total power according to the preset power allocation table, the following steps are further included: Obtaining theoretical required power for increasing the pre-brightened area to a third backlight intensity; Obtaining a theoretical raised power for the non-brightened area while keeping the current total power unchanged; First, determine whether the theoretical required power is greater than the theoretical raised power; If the first judgment result is no, the power corresponding to the backlight intensity increment is obtained according to the preset power upper limit and the current total power, the power corresponding to the backlight intensity increment in the non-brightened area is transferred to the pre-brightened area, and the PWM duty cycle is sent to increase the pre-brightened area to the third backlight intensity.

7. The method for adjusting the brightness of a liquid crystal display according to claim 6, wherein: After the first step of determining whether the theoretical required power is greater than the theoretical raised power, the following steps are further included: If the first judgment result is yes, it is defined as being in a power deficit state, and a theoretical power deficit value is obtained according to the theoretical required power and the theoretical raised power; Encapsulating the theoretical power shortfall as a power increase budget value into a temporary power budget increase request and sending the request; After receiving the temporary power budget increase request, secondly determining whether the sum of the power increase budget value and the current total power is less than the preset power upper limit; If the second judgment result is yes, increasing the current total power to a temporary total power; The temporary total power is the sum of the power boost budget value and the current total power.

8. The method for adjusting brightness of a liquid crystal display according to claim 7, wherein: If the second judgment result is yes, after increasing the current total power to the temporary total power, the method further includes the following steps: thirdly, determining whether the temporary total power is greater than the theoretical required power; If the third judgment result is yes, the power corresponding to the backlight intensity increment is obtained according to the preset power upper limit and the temporary total power, the power corresponding to the backlight intensity increment in the non-brightened area is transferred to the pre-brightened area, and the PWM duty cycle is sent to increase the pre-brightened area to the third backlight intensity.

9. The method for adjusting brightness of a liquid crystal display according to claim 8, wherein: If the third judgment result is yes, after obtaining the power corresponding to the backlight intensity increment based on the preset power upper limit and the temporary total power, transferring the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area, and sending a PWM duty cycle to increase the backlight intensity in the pre-brightened area to the third backlight intensity, the following steps are further included: Fourth, determining whether the exploration frame is moved, canceled, or has not been operated for a long time; If any of the fourth determination results is yes, sending a temporary power budget cancellation request; After receiving the temporary power budget cancellation request, the temporary total power is reduced to the current total power.

10. A liquid crystal display brightness adjustment system, characterized in that: include: an area determination module, configured to specify a pre-brightened area in a display image and obtain an original grayscale value of each pixel in the pre-brightened area under a first backlight intensity; a backlight intensity boosting module, configured to transfer, according to a preset power allocation table and provided that the current total power does not exceed a preset power upper limit, the power corresponding to the backlight intensity increment in the non-brightened area to the pre-brightened area, so as to boost the backlight intensity in the pre-brightened area to a second backlight intensity; a compensation value determination module, configured to calculate and obtain a grayscale compensation value corresponding to offsetting the light leakage increment according to the second backlight intensity, the original grayscale value of each pixel, and a preset leakage characteristic table; The pixel correction module is used to correct the original grayscale value of each pixel according to the grayscale compensation value to obtain a corrected grayscale value of each pixel, and send the corrected grayscale value to the liquid crystal panel for display under the second backlight intensity.

Images