Method, device and medium for improving ffs liquid crystal display quality based on gamma curve

Abstract

The application discloses a method, equipment and medium for improving FFS liquid crystal display quality based on a gamma curve. The method comprises the following steps: measuring the brightness of an FFS liquid crystal screen to obtain a gamma curve of the FFS liquid crystal screen; adjusting the gamma curve of the FFS liquid crystal screen to a standard value, and fixing the positive voltage value of each voltage division point in the FFS liquid crystal screen; adjusting the negative voltage value of the voltage division point corresponding to the highest gray scale in the gamma curve, so that the FFS liquid crystal screen eliminates residual image at the gray scale and obtains ideal target brightness at the highest gray scale; determining a voltage search range based on the ideal target brightness at the highest gray scale, and adjusting the negative voltage value of the voltage division point corresponding to other gray scales in the gamma curve in the determined voltage search range, so that the FFS liquid crystal screen eliminates residual image at each gray scale in the gamma curve. The application realizes objective and efficient automatic residual image elimination of the FFS screen, and is widely applied to the gamma correction process in the development of the FFS screen.

Description

Technical Field

[0001] This invention relates to the field of gamma correction technology, and specifically to a method, apparatus and medium for improving the image quality of FFS liquid crystal displays based on gamma curves. Background Technology

[0002] In FFS (Fringe Field Switch) mode liquid crystal displays, if a static image or fixed interface is displayed for an extended period, image retention can easily occur. This is because minute asymmetries in the liquid crystal driver create a net DC voltage component, causing liquid crystal molecules and ion impurities to migrate directionally and accumulate, thus becoming "anchored" to specific locations. Even when the image changes, these molecules cannot immediately recover, resulting in a remnant of the previous image.

[0003] Traditional methods for detecting image retention involve displaying an image with an afterimage for an extended period, then switching to a test screen specifically for image retention confirmation, and relying on the human eye to subjectively judge whether any residue exists. While this method is simple to operate, the consistency of image retention assessment results is low due to differences in visual sensitivity, ambient light adaptation, and subjective judgment standards among different observers.

[0004] Therefore, the reliability of visual inspection methods is significantly affected by human subjective factors. On the one hand, it may cause misjudgment or missed detection, and on the other hand, it cannot form a standardized evaluation basis, making it difficult to promote and apply. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a method, apparatus and medium for improving the image quality of an FFS liquid crystal display based on a gamma curve.

[0006] The first aspect of this invention provides a method for improving the image quality of an FFS liquid crystal display based on a gamma curve, comprising the following steps:

[0007] The brightness of the FFS LCD screen was measured to obtain the gamma curve of the FFS LCD screen.

[0008] Adjust the gamma curve of the FFS LCD screen to the standard value and fix the positive voltage value of each voltage divider point in the FFS LCD screen.

[0009] Adjusting the negative voltage value of the voltage divider point corresponding to the highest gray level in the gamma curve enables the FFS LCD screen to eliminate ghosting at that gray level and obtain the ideal target brightness at the highest gray level.

[0010] Based on the ideal target brightness at the highest gray level, the voltage search range is determined. Within the determined voltage search range, the negative electrode voltage value of the corresponding voltage divider point of other gray levels of the gamma curve is adjusted so that the FFS LCD screen eliminates ghosting at each gray level of the gamma curve.

[0011] Furthermore, the measurement of the brightness of the FFS liquid crystal screen to obtain the gamma curve of the FFS liquid crystal screen specifically includes the following steps:

[0012] Control the FFS LCD screen to display images of different grayscale levels;

[0013] The brightness of the FFS LCD screen was measured using a two-dimensional luminance meter.

[0014] The gamma curve of the FFS LCD screen is fitted based on the grayscale of the displayed image and the brightness measured by a 2D luminance meter.

[0015] Furthermore, adjusting the gamma curve of the FFS LCD screen to a standard value specifically includes the following steps:

[0016] Determine the target brightness values ​​for each grayscale level when the gamma curve of the FFS LCD screen is at the standard value;

[0017] Adjust the positive and negative voltage values ​​of each voltage divider point in the FFS LCD screen so that the brightness value presented by the FFS LCD screen at each grayscale level is equal to the target brightness value.

[0018] Furthermore, the adjustment of the negative electrode voltage value at the voltage divider point corresponding to the highest gray level in the gamma curve specifically includes the following steps:

[0019] A preset image for inducing ghosting is displayed on the FFS LCD screen to induce ghosting on the FFS LCD screen;

[0020] Switch the image displayed on the FFS LCD screen to the image for ghosting confirmation, and use a two-dimensional luminance meter to measure the brightness of the FFS LCD screen to determine whether ghosting occurs on the FFS LCD screen.

[0021] When ghosting occurs on the screen, the voltage divider point corresponding to the highest gray level in the gamma curve is determined by a preset gamma mapping table, and the negative voltage value of the voltage divider point corresponding to the highest gray level in the gamma curve is adjusted by a step voltage.

[0022] Return to the step of displaying the preset image that induces ghosting on the FFS LCD screen, and re-determine whether ghosting occurs on the FFS LCD screen until no ghosting occurs on the screen;

[0023] When no ghosting occurs on the screen, the negative voltage value of the voltage divider point corresponding to the highest gray level in the gamma curve is fixed.

[0024] Furthermore, the ideal target brightness at the highest gray level is determined by adjusting the negative electrode voltage at the voltage divider point corresponding to the highest gray level in the gamma curve, and then measuring the brightness of the FFS LCD screen at the highest gray level using a two-dimensional luminance meter, which is taken as the ideal target brightness.

[0025] Furthermore, determining the voltage search range based on the ideal target brightness at the highest grayscale specifically includes the following steps:

[0026] The ideal target brightness at each gray level is calculated using the following formula:

[0027] ;

[0028] Where Limax is the ideal target brightness at the highest gray level, imax is the order, i represents each gray level, and gamma is the gamma exponent.

[0029] A tolerance range is set for the ideal target brightness to obtain the theoretical target brightness at each gray level;

[0030] Using the brightness-driving voltage relationship model at each gray level, the theoretical target brightness at each gray level is mapped to voltage, thus obtaining the voltage search range.

[0031] Furthermore, the brightness-driving voltage relationship model is constructed based on the gamma curve of the FFS LCD screen.

[0032] Furthermore, the step of adjusting the negative electrode voltage value at the corresponding voltage divider point of other gray levels of the gamma curve within the determined voltage search range specifically includes the following steps:

[0033] Set the lowest gray level as the target gray level;

[0034] A preset image for inducing ghosting is displayed on the FFS LCD screen to induce ghosting on the FFS LCD screen;

[0035] Switch the image displayed on the FFS LCD screen to the image for ghosting confirmation, and use a two-dimensional luminance meter to measure the brightness of the FFS LCD screen to determine whether ghosting occurs on the FFS LCD screen.

[0036] When ghosting occurs on the screen, the voltage divider point corresponding to the target gray level in the gamma curve is determined by the preset gamma mapping table, and the negative voltage value of the voltage divider point is adjusted within the voltage search range corresponding to the target gray level.

[0037] Returning to the step of displaying the preset image induced by ghosting on the FFS LCD screen, re-determine whether ghosting occurs on the FFS LCD screen until no ghosting occurs on the screen, which is considered as the negative voltage value of the target grayscale being adjusted.

[0038] The second lowest grayscale is determined as the target grayscale. The process returns to the step of displaying the preset image induced by ghosting on the FFS LCD screen, thus completing the adjustment of the negative electrode voltage value of the second lowest grayscale. The adjusted grayscale is gradually increased until the negative electrode voltage value of all grayscales has been adjusted.

[0039] Another aspect of the present invention discloses an electronic device, including a processor and a memory;

[0040] The memory is used to store programs;

[0041] The processor executes the program to implement the above-mentioned method for improving the image quality of FFS liquid crystal displays based on gamma curves.

[0042] Another aspect of the present invention discloses a computer-readable storage medium storing a program that is executed by a processor to implement the above-described method for improving the image quality of an FFS liquid crystal display based on a gamma curve.

[0043] This invention also discloses a computer program product or computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device can read the computer instructions from the computer-readable storage medium and execute the computer instructions, causing the computer device to perform the aforementioned method.

[0044] The embodiments of the present invention have the following beneficial effects: The method, apparatus, and medium for improving the image quality of FFS liquid crystal displays based on gamma curves, on the one hand, constrain the search range for voltage adjustments of other gray levels by eliminating ghosting at the highest gray level, avoiding blind trial and error within a wide voltage range as in traditional methods; on the other hand, by replacing visual measurement with a two-dimensional luminance meter to measure the brightness distribution within the screen, objective and quantitative FFS screen measurement can be achieved. The present invention achieves objective and efficient automated ghosting elimination for FFS screens and is widely used in the gamma correction process during FFS screen development.

[0045] Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram illustrating the basic steps of a method for improving the image quality of an FFS liquid crystal display based on gamma curves according to the present invention; 0

[0048] Figure 2 This is a schematic diagram illustrating the implementation environment of the method for improving the image quality of FFS liquid crystal displays based on gamma curves according to the present invention;

[0049] Figure 3 This is a schematic diagram of the internal circuit structure of an FFS LCD screen;

[0050] Figure 4 This is a schematic diagram showing the correspondence between the voltage divider points of the internal circuit and the grayscale of the gamma curve in an FFS LCD screen.

[0051] Figure 5 This is a schematic diagram of the gamma curve fitted to the FFS LCD screen.

[0052] Figure 6 This is a schematic diagram of the afterimage-induced image used in this invention;

[0053] Figure 7 This is a schematic diagram of the afterimage confirmation image used in this invention;

[0054] Figure 8 This is a schematic diagram of the structure of an electronic device according to the present invention;

[0055] Figure 9 This is a schematic diagram of a computer-readable storage medium structure according to the present invention. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0057] FFS (Film-Free View) liquid crystal display technology is an extension of IPS (Integrated Switched Pixel) wide-viewing-angle technology. By generating an edge electric field between the electrodes on the same plane, the liquid crystal molecules between and directly above the electrodes can rotate in a plane parallel to the substrate, significantly improving brightness and image quality. FFS technology overcomes the low transmittance problem of conventional IPS technology, achieving high transmittance while maintaining a wide viewing angle, and avoiding the water ripple effect caused by compression, providing more realistic image effects and displaying colors closer to reality. Its display principle is similar to IPS, using a horizontal electric field. When no voltage is applied, the liquid crystal molecules are in a dark state; when a voltage is applied, the liquid crystal molecules are in a bright state.

[0058] Ideally, the voltage driving the liquid crystal should be a perfectly symmetrical alternating current voltage with zero net voltage, allowing the liquid crystal molecules to rotate freely near a neutral reference position. However, achieving perfect symmetry is difficult in actual driving integrated circuits (ICs) and liquid crystal materials. Therefore, when displaying static images for extended periods, a fixed voltage pattern continuously applies a weak net DC voltage. This DC component causes charged liquid crystal molecules and intracellular ionic impurities to directionally migrate towards one electrode, gradually attaching and accumulating, thus becoming "anchored" in a certain position. Even when switching images, these stuck molecules and ions cannot immediately return to a free state, resulting in a ghost image of the previous image.

[0059] To eliminate the image retention defect of FFS LCD screens, such as Figure 1 As shown, the first aspect of the present invention provides a method for improving the image quality of an FFS liquid crystal display based on a gamma curve, comprising the following steps:

[0060] S1. Measure the brightness of the FFS LCD screen and obtain the gamma curve of the FFS LCD screen;

[0061] S2. Adjust the gamma curve of the FFS LCD screen to the standard value and fix the positive voltage value of each voltage divider point in the FFS LCD screen;

[0062] S3. Adjust the negative voltage value of the voltage divider point corresponding to the highest gray level in the gamma curve so that the FFS LCD screen eliminates ghosting at that gray level and obtains the ideal target brightness at the highest gray level.

[0063] S4. Determine the voltage search range based on the ideal target brightness at the highest gray level, and adjust the negative electrode voltage value of the corresponding voltage divider point of other gray levels in the gamma curve within the determined voltage search range, so that the FFS LCD screen eliminates ghosting at each gray level in the gamma curve.

[0064] This invention employs automated methods for gamma correction, offering higher accuracy compared to traditional visual correction techniques. It completely eliminates the subjectivity and uncertainty arising from individual human judgment, while also facilitating widespread application. Furthermore, the process of eliminating ghosting at the highest grayscale level constrains the search range for voltage adjustments at other grayscale levels, avoiding the blind trial-and-error approach across a wide voltage range common in traditional methods; thus improving the efficiency of gamma correction.

[0065] The implementation environment of this invention embodiment is as follows: Figure 2As shown. The two-dimensional luminance meter can accurately measure the brightness values ​​of different areas within the screen, thereby detecting brightness unevenness and afterimages that are difficult for the human eye to perceive. Replacing traditional methods relying on subjective human judgment with 2D luminance meter measurement data effectively reduces judgment fluctuations. The lighting unit can control the FFS LCD screen to display specific video signals according to instructions from the host computer, which are then used by the 2D luminance meter for brightness detection. The host computer controls the FFS LCD screen to display grayscale images via the lighting unit, and then samples the brightness distribution of the FFS LCD screen using the 2D luminance meter to achieve automated, high-precision gamma correction.

[0066] For cost reasons, FFS LCD screens do not design a separate voltage channel output for each grayscale value. Instead, they use a resistor divider network with several voltage divider points. By flexibly configuring the output voltage of these points, different grayscale values ​​can be displayed. In this case, the grayscale value output by each voltage divider point forms a segment, which is called a grayscale. This means that the grayscale range corresponding to this grayscale is displayed through the output of the corresponding voltage divider point.

[0067] In this embodiment of the invention, the internal circuit structure of the FFS LCD screen is as follows: Figure 3 As shown in the diagram, the driver chip for the FFS LCD screen incorporates a resistor divider network with 19 voltage divider points, each corresponding to a DAC channel output. When the FFS LCD screen needs to display an image of a certain grayscale, the analog switch inside the driver chip fine-tunes the closest voltage divider point in the resistor divider network based on the input digital grayscale value, outputting a voltage signal corresponding to the grayscale to drive the FFS LCD screen to display the image. A schematic diagram illustrating the correspondence between the voltage divider points and the gamma curve grayscale in this embodiment is shown below. Figure 4 As shown.

[0068] As a preferred embodiment, the steps of the present invention are further described below:

[0069] S1. Measure the brightness of the FFS LCD screen and obtain the gamma curve of the FFS LCD screen.

[0070] In step S1, the brightness of the FFS liquid crystal screen is measured to obtain the gamma curve of the FFS liquid crystal screen, which specifically includes the following steps:

[0071] S1-1. Control the FFS LCD screen to display images of different grayscale levels;

[0072] S1-2. Measure the brightness of the FFS LCD screen using a two-dimensional luminance meter;

[0073] S1-3. Fit the gamma curve of the FFS LCD screen based on the grayscale of the displayed image and the brightness measured by the two-dimensional luminance meter.

[0074] The gamma curve fitted in step S1 is as follows: Figure 4 As shown, due to the asymmetry of the voltage driving the liquid crystal, the current FFS liquid crystal screen displays a relatively obvious image retention phenomenon.

[0075] S2. Adjust the gamma curve of the FFS LCD screen to the standard value and fix the positive voltage value of each voltage divider point in the FFS LCD screen.

[0076] In step S2, the gamma curve of the FFS LCD screen is adjusted to a standard value, which specifically includes the following steps:

[0077] S2-1. Determine the target brightness values ​​for each grayscale level when the gamma curve of the FFS LCD screen is at the standard value;

[0078] S2-2. Adjust the positive and negative voltage values ​​of each voltage divider point in the FFS LCD screen so that the brightness value presented by the FFS LCD screen at each grayscale level is equal to the target brightness value.

[0079] In this embodiment of the invention, the gamma curve used as the standard value is a gamma 2.2 curve. This curve ensures that the image displayed on the screen meets most display requirements under normal indoor lighting conditions. In some embodiments, a gamma 2.4 curve can also be fitted to adapt to different usage scenarios. Higher gamma values ​​provide deeper blacks and higher contrast, especially suitable for viewing environments with low light (such as home theaters). When the gamma curve is at the standard value, the grayscale of each grayscale output image of the FFS screen conforms to the visual response characteristics of the human eye. However, the FFS screen can still produce image retention due to the asymmetry of positive and negative polarities. In this case, this embodiment of the invention fixes the positive voltage value of each voltage divider point in the FFS liquid crystal screen and overcomes the image retention phenomenon by adjusting the negative voltage value of each voltage divider point.

[0080] S3. Adjust the negative voltage value of the voltage divider point corresponding to the highest gray level in the gamma curve so that the FFS LCD screen eliminates ghosting at that gray level and obtains the ideal target brightness at the highest gray level.

[0081] In step S3, the negative electrode voltage value is adjusted at the voltage divider point corresponding to the highest gray level in the gamma curve. This specifically includes the following steps:

[0082] S3-1. Display a preset image to induce ghosting on the FFS LCD screen, thereby inducing ghosting on the FFS LCD screen.

[0083] In step S3-1, the afterimage-induced image is a high-contrast or static specific pattern. The afterimage-induced image used in this embodiment of the invention is as follows: Figure 6As shown, the host computer controls the lamp generator to drive the FFS screen to display IMa or IMb for a long time, causing the liquid crystal molecules and charge distribution of the FFS screen to migrate and accumulate in a directional manner, which makes the screen prone to image retention.

[0084] S3-2. Switch the image displayed on the FFS LCD screen to the image for ghosting confirmation, use a two-dimensional luminance meter to measure the brightness of the FFS LCD screen, and determine whether ghosting occurs on the FFS LCD screen.

[0085] In step S3-2, the afterimage induction image is switched to an afterimage confirmation image with uniform mid-grayscale (e.g., ...). Figure 7 As shown in the figure, this allows the 2D luminance meter to scan the luminance distribution of the FFS screen and confirm whether there is image retention.

[0086] S3-3. When ghosting occurs on the screen, the voltage divider point corresponding to the highest gray level in the gamma curve is determined by the preset gamma mapping table, and the negative voltage value of the voltage divider point corresponding to the highest gray level in the gamma curve is adjusted by a step voltage.

[0087] In step S3-3, when the host computer determines that ghosting exists, it needs to adjust the voltage. The voltage adjustment is performed using a gamma mapping table that characterizes the parameters of the gamma voltage curve inside the driver chip. The gamma mapping table clearly identifies which voltage divider is responsible for each grayscale interval. Based on this, the system determines the specific voltage divider (V255N) corresponding to the highest grayscale (255 in this embodiment). Subsequently, the host computer fine-tunes the negative electrode voltage (Vneg) of this voltage divider with a very small fixed step (10mV in this embodiment) to change the electric field applied to the liquid crystal and eliminate asymmetric charge accumulation.

[0088] S3-4. Return to the step of displaying the preset image induced by ghosting on the FFS LCD screen, and re-determine whether ghosting occurs on the FFS LCD screen until ghosting does not occur on the screen.

[0089] In steps S3-4, after each voltage adjustment, the host computer repeats the "induction-measurement-judgment" process to verify whether the voltage adjustment has effectively eliminated the afterimage. This cycle continues to iterate until the host computer determines that the afterimage has been eliminated based on the measurement data from the two-dimensional luminance meter.

[0090] S3-5. When no ghosting occurs on the screen, fix the negative voltage value of the voltage divider point corresponding to the highest gray level in the gamma curve.

[0091] In steps S3-5, when the host computer determines that the afterimage has been eliminated, it means that the currently set negative voltage value is the optimal operating voltage for the highest grayscale voltage division point. At this time, the host computer will fix this voltage value as the optimal operating voltage for the highest grayscale voltage division point.

[0092] After adjusting the negative electrode voltage at the voltage divider point corresponding to the highest grayscale in the gamma curve in step S3, the host computer will also measure the brightness of the FFS LCD screen at the highest grayscale using a two-dimensional luminance meter, which will be used as the ideal target brightness. The ideal target brightness at the highest grayscale is used as the reference for voltage adjustment of other grayscales, which can effectively narrow the voltage adjustment range and improve the calibration efficiency.

[0093] S4. Determine the voltage search range based on the ideal target brightness at the highest gray level, and adjust the negative electrode voltage value of the corresponding voltage divider point of other gray levels in the gamma curve within the determined voltage search range, so that the FFS LCD screen eliminates ghosting at each gray level in the gamma curve.

[0094] In step S4, the voltage search range is determined based on the ideal target brightness at the highest grayscale, specifically including the following steps:

[0095] S4-1. Calculate the ideal target brightness for each grayscale level using the following formula:

[0096] ;

[0097] Where Limax is the ideal target brightness at the highest gray level, imax is the order, i represents each gray level, and gamma is the gamma exponent. This embodiment of the invention uses a gamma 2.2 curve as the standard value; therefore, the highest gray level is 255, and the gamma exponent is 2.2.

[0098] S4-2. Set a tolerance range for the ideal target brightness to obtain the theoretical target brightness at each gray level.

[0099] Considering the specific engineering implementation, it is difficult to ensure that every grayscale level of the FFS screen can display the ideal target brightness. Therefore, the host computer will set a tolerance range ΔL for the ideal target brightness, that is, the grayscale level within the brightness range [L]. i -ΔL,L i Afterimage elimination is achieved within the range of +ΔL].

[0100] S4-3. Using the brightness-driving voltage relationship model at each gray level, the theoretical target brightness at each gray level is mapped to voltage to obtain the voltage search range.

[0101] In this embodiment of the invention, the brightness-driving voltage relationship model is constructed based on the gamma curve of the FFS LCD screen. In step S1, during the fitting of the FFS LCD screen's gamma curve, the host computer obtains the correspondence data between the voltage divider point values ​​and the FFS screen brightness through actual measurements. The host computer establishes a relationship model based on this data and uses this model to process the theoretical target brightness, obtaining the voltage search range for each grayscale level. In this embodiment of the invention, the design of the voltage search range reduces the search space for step-by-step adjustment of the negative electrode voltage value for each grayscale level, thereby improving the FFS screen correction efficiency.

[0102] In step S4, the negative electrode voltage value of the corresponding voltage divider point of other gray levels of the gamma curve is adjusted within the determined voltage search range. This specifically includes the following steps:

[0103] S4-4. Determine the lowest gray level as the target gray level;

[0104] S4-5. Display a preset image that induces ghosting on the FFS LCD screen to induce ghosting on the FFS LCD screen;

[0105] S4-6. Switch the image displayed on the FFS LCD screen to the image for ghosting confirmation, use a two-dimensional luminance meter to measure the brightness of the FFS LCD screen, and determine whether ghosting occurs on the FFS LCD screen.

[0106] S4-7. When ghosting occurs on the screen, determine the voltage divider point corresponding to the target gray level in the gamma curve through the preset gamma mapping table, and adjust the negative voltage value of the voltage divider point within the voltage search range corresponding to the target gray level.

[0107] S4-8. Return to the step of displaying the preset image induced by ghosting on the FFS LCD screen, re-determine whether ghosting occurs on the FFS LCD screen, until no ghosting occurs on the screen, and consider the negative voltage value of the target grayscale to be adjusted.

[0108] S4-9. Determine the second lowest grayscale as the target grayscale, return to the step of displaying the preset ghosting induced image on the FFS LCD screen, and complete the adjustment of the negative electrode voltage value of the second lowest grayscale; until the negative electrode voltage value of all grayscales has been adjusted.

[0109] The adjustment of the negative electrode voltage value of the voltage divider point corresponding to other gray levels in step S4 is the same as the adjustment process of the voltage divider point corresponding to the highest gray level in step S3. However, the difference is that the voltage adjustment range is limited to the voltage search range of each gray level. After one gray level is adjusted, the system automatically sets the next higher gray level as the new target gray level and repeats the entire adjustment process until the negative electrode voltage value of all gray levels (from the lowest to the highest) has been adjusted.

[0110] This invention uses the theoretical target brightness of the highest grayscale as the global anchor point, and sequentially adjusts the negative voltage of all other grayscales, ultimately achieving the elimination of ghosting in all grayscales of the FFS LCD screen, and ensuring that the overall brightness response conforms to the gamma curve standard value.

[0111] Compared with traditional methods for eliminating ghosting, the embodiments of the present invention replace the long trial-and-error process that relies on manual judgment and adjustment with fully automated closed-loop adjustment, which greatly reduces the judgment deviation and improves the correction efficiency by tens of times, providing an objective and reliable ghosting elimination solution for high-quality production and calibration of FFS LCD screens.

[0112] Figure 8 This is a schematic diagram of the electronic device proposed in the second embodiment of the present invention. In this embodiment, the memory stores program instructions for implementing the method of improving the image quality of an FFS liquid crystal display based on the gamma curve in any of the above embodiments. The processor executes the program instructions stored in the memory to perform the scheme of improving the image quality of an FFS liquid crystal display based on the gamma curve. The processor can also be called a CPU (Central Processing Unit). The processor may be an integrated circuit chip with signal processing capabilities. The processor can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0113] The methods described in the first embodiment of the present invention are applicable to the embodiments of the present electronic device. The specific functions implemented by the embodiments of the present electronic device are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above methods.

[0114] Figure 9This is a schematic diagram of the structure of a computer-readable storage medium according to the fourth embodiment of the present invention. The computer-readable storage medium of the fourth embodiment stores program instructions capable of implementing the above-described method for improving the image quality of an FFS liquid crystal display based on gamma curves. These program instructions can be stored in the storage medium in the form of a software product, including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods of various embodiments of the present invention. The aforementioned computer-readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks, or terminal devices such as computers, servers, mobile phones, and tablets.

[0115] The methods described in the first embodiment of the present invention are applicable to the computer-readable storage medium embodiment. The specific functions implemented by the computer-readable storage medium embodiment are the same as those in the above method embodiment, and the beneficial effects achieved are also the same as those achieved by the above method.

[0116] This embodiment also provides a computer program product that, when run on a computer, causes the computer to perform the aforementioned related steps to achieve the method for improving the image quality of FFS liquid crystal displays based on gamma curves provided in the above embodiment.

[0117] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the embodiments of the present invention are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and corresponding operation entry points are provided for users to choose to authorize or refuse.

[0118] Those skilled in the art will understand that modules in the device of the embodiments of the present invention can be adaptively modified and placed in one or more devices different from those embodiments. Modules, units, or components in the embodiments of the present invention can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the corresponding claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the corresponding claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0119] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0120] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0121] Furthermore, the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. In particular, for embodiments such as apparatus and devices, since they are basically similar to the method embodiments, the relevant parts can be referred to the description of the method embodiments. The apparatus, devices, and other embodiments described above are merely illustrative, and the modules, units, etc., described as separate components may or may not be physically separate, that is, they may be located in one place or distributed in multiple places, such as nodes in a system network. Specifically, some or all of the modules and units can be selected according to actual needs to achieve the purpose of the above-described embodiment solutions. Those skilled in the art can understand and implement this without creative effort.

[0122] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0123] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0124] Furthermore, the terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of technical features indicated in this embodiment. Therefore, features defined with terms such as "first" and "second" in the embodiments of this invention can explicitly or implicitly indicate that the embodiment includes at least one of those features. In the description of this invention, the word "multiple" means at least two or more, such as two, three, four, etc., unless otherwise explicitly specified in the embodiments.

[0125] In embodiments of the present invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of the present invention may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0126] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention. Other embodiments of the present invention will readily conceive of by considering the specification and practicing the invention. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

Claims

1. A method for improving FFS liquid crystal display quality based on gamma curve, characterized in that, The method comprises the following steps: determining the brightness of the FFS liquid crystal screen to obtain a gamma curve of the FFS liquid crystal screen; adjusting the gamma curve of the FFS liquid crystal screen to a standard value, and fixing the positive voltage value of each voltage division point in the FFS liquid crystal screen; adjusting the negative voltage value of the voltage division point corresponding to the highest gray scale in the gamma curve, so that the FFS liquid crystal screen eliminates residual image at the gray scale and obtains ideal target brightness at the highest gray scale; determining a voltage search range based on the ideal target brightness at the highest gray scale, and adjusting the negative voltage value of the voltage division point corresponding to other gray scales in the gamma curve in the determined voltage search range, so that the FFS liquid crystal screen eliminates residual image at each gray scale in the gamma curve; wherein the adjusting of the negative voltage value of the voltage division point corresponding to the highest gray scale in the gamma curve comprises the following steps: displaying a preset residual image inducing image on the FFS liquid crystal screen to induce residual image of the FFS liquid crystal screen; switching the image displayed on the FFS liquid crystal screen to a residual image confirmation image, measuring the brightness of the FFS liquid crystal screen by using a two-dimensional brightness meter, and judging whether residual image occurs on the FFS liquid crystal screen; when residual image occurs on the screen, determining the voltage division point corresponding to the highest gray scale in the gamma curve by using a preset gamma mapping table, and adjusting the negative voltage value of the voltage division point corresponding to the highest gray scale in the gamma curve by one step voltage; returning to the step of displaying the preset residual image inducing image on the FFS liquid crystal screen, and re-judging whether residual image occurs on the FFS liquid crystal screen until no residual image occurs on the screen; when no residual image occurs on the screen, fixing the negative voltage value of the voltage division point corresponding to the highest gray scale in the gamma curve; the adjusting of the negative voltage value of the voltage division point corresponding to other gray scales in the gamma curve in the determined voltage search range comprises the following steps: determining the lowest gray scale as a target gray scale; displaying a preset residual image inducing image on the FFS liquid crystal screen to induce residual image of the FFS liquid crystal screen; switching the image displayed on the FFS liquid crystal screen to a residual image confirmation image, measuring the brightness of the FFS liquid crystal screen by using a two-dimensional brightness meter, and judging whether residual image occurs on the FFS liquid crystal screen; when residual image occurs on the screen, determining the voltage division point corresponding to the target gray scale in the gamma curve by using a preset gamma mapping table, and adjusting the negative voltage value of the voltage division point in the target gray scale voltage search range; returning to the step of displaying the preset residual image inducing image on the FFS liquid crystal screen, and re-judging whether residual image occurs on the FFS liquid crystal screen until no residual image occurs on the screen, which is regarded as that the negative voltage value of the target gray scale is adjusted; determining the second-lowest gray scale as a target gray scale, returning to the step of displaying the preset residual image inducing image on the FFS liquid crystal screen, and completing the negative voltage value adjustment of the second-lowest gray scale; gradually increasing the adjusted gray scale until the negative voltage value of all gray scales is adjusted.

2. The method of claim 1, wherein the gamma curve is defined as: ###0001### where x is a pixel value, and y is a luminance value. the determining of the brightness of the FFS liquid crystal screen to obtain the gamma curve of the FFS liquid crystal screen comprises the following steps: controlling the FFS liquid crystal screen to display images of different gray scales; measuring the brightness of the FFS liquid crystal screen by using a two-dimensional brightness meter; According to the gray scale of the displayed image and the brightness measured by the two-dimensional brightness meter, a gamma curve of the FFS liquid crystal screen is fitted.

3. The method of claim 1, wherein the gamma curve is determined by a function of the form: ###0001### where x is a pixel value, and a, b, c, d, and e are constants. The gamma curve of the FFS liquid crystal screen is adjusted to a standard value, and the method specifically comprises the following steps: The target brightness value of each gray scale when the gamma curve of the FFS liquid crystal screen is at the standard value is determined. The positive voltage value and the negative voltage value of each voltage division point in the FFS liquid crystal screen are adjusted, so that the brightness value of the FFS liquid crystal screen at each gray scale is equal to the target brightness value.

4. The method for improving the image quality of an FFS liquid crystal display based on a gamma curve according to claim 1, characterized in that, The ideal target brightness at the highest gray scale is measured by the two-dimensional brightness meter after the adjustment of the negative voltage value of the voltage division point corresponding to the highest gray scale in the gamma curve, and is taken as the ideal target brightness.

5. The method for improving the image quality of an FFS liquid crystal display based on a gamma curve according to claim 1, characterized in that, The voltage search range is determined based on the ideal target brightness at the highest gray scale, and the method specifically comprises the following steps: The ideal target brightness at each gray scale is calculated according to the following formula: ； wherein, is the ideal target luminance at the highest gray scale, imax is the number of gray scales, i indicates each gray scale, and gamma is the gamma index. The theoretical target brightness at each gray scale is obtained by setting a tolerance range for the ideal target brightness. The voltage search range is obtained by mapping the theoretical target brightness at each gray scale to voltage using a brightness-driving voltage relationship model at each gray scale.

6. The method for improving the image quality of an FFS liquid crystal display based on a gamma curve according to claim 1, characterized in that, The brightness-driving voltage relationship model is constructed according to the gamma curve of the FFS liquid crystal screen.

7. An electronic device, comprising: The device comprises a processor and a memory. The memory is used to store a program. The processor executes the program to realize the method for improving the display quality of the FFS liquid crystal screen based on the gamma curve.

8. A computer-readable storage medium, characterized in that, The storage medium stores a program, and the program is executed by the processor to realize the method for improving the display quality of the FFS liquid crystal screen based on the gamma curve.

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