Display apparatus and control method of display apparatus

Abstract

The application discloses a display device and a control method thereof. The method comprises the following steps: generating a first transmittance of each pixel unit in a first partition image; when the first transmittance corresponding to a first target pixel unit is greater than a transmittance threshold, determining first pixel data corresponding to the first target pixel unit according to a gain coefficient, the first transmittance and a preset pixel value, wherein the first target pixel unit is a pixel unit in the first partition image whose first transmittance is greater than the transmittance threshold; driving a first to-be-displayed pixel according to the first pixel data; generating a second transmittance of each pixel unit in a second partition image; determining second pixel data corresponding to a second target pixel unit according to a gain coefficient, the second transmittance and a preset pixel value, wherein the second target pixel unit is a pixel unit corresponding to the first to-be-displayed pixel in the second partition image; and driving the first to-be-displayed pixel according to the second pixel data, so as to suppress overexposure or color cast of the display device and improve the display quality of the display device.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display device and a control method for the display device. Background Technology

[0002] With the continuous iteration and development of display technology, LCD displays are rapidly evolving towards larger sizes, ultra-high definition, and high refresh rates. Field-sequence color display technology has become a key research direction for the next generation of low-power display technology. However, existing field-sequence display devices are limited by factors such as hardware architecture and algorithm control, and are prone to image quality defects such as overexposure of highlights and color shift during actual display, which reduces the display quality of the display devices. Summary of the Invention

[0003] This application provides a display device and a control method for the display device, which can suppress overexposure or color shift during the field sequence display process of the display device and improve the display quality of the display device.

[0004] The first aspect of this application discloses a display device, including:

[0005] The backlight module includes multiple backlight zones, each of which includes a red light source, a green light source, and a blue light source;

[0006] A liquid crystal panel; comprising multiple pixels, each pixel comprising multiple sub-pixels, wherein the liquid crystal panel is a liquid crystal panel without a color filter;

[0007] The controller is connected to both the backlight module and the LCD panel, and is configured to:

[0008] The current frame image is parsed to obtain three subfield images, which correspond to red, green and blue respectively;

[0009] Based on the image information of the first partition image, a first transmittance corresponding to each pixel unit in the first partition image is generated, wherein the first partition image is a partition image corresponding to the first backlight partition in the first subfield image, the first subfield image is the first subfield image to be displayed in time, and the first backlight partition is any one of the plurality of backlight partitions.

[0010] When the first transmittance corresponding to the first target pixel unit is greater than the transmittance threshold, the first pixel data corresponding to the first target pixel unit is determined according to the gain coefficient, the first transmittance of the first target pixel unit and the preset pixel value. The first target pixel unit is a pixel unit in the first partition image whose first transmittance is greater than the transmittance threshold. The preset pixel value is the maximum pixel value that the sub-pixel can achieve. The first pixel data represents the product of the ratio of the first transmittance corresponding to the first target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value.

[0011] Based on the first pixel data corresponding to the first target pixel unit, drive the first pixel to be displayed in the liquid crystal panel, wherein the first pixel to be displayed is a pixel of the first target pixel unit whose first transmittance is greater than the transmittance threshold;

[0012] Based on the image information of the second partition image, a second transmittance corresponding to each pixel unit in the second partition image is generated. The second partition image is a partition image corresponding to the second backlight partition in the second subfield image. The second backlight partition is any one of the multiple backlight partitions. The second subfield image is a subfield image that is in sequence after the first subfield image. The second target pixel unit is a pixel unit in the second partition image corresponding to the first pixel to be displayed.

[0013] Based on the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value, the second pixel data corresponding to the second target pixel unit is determined, wherein the second pixel data represents the product of the ratio of the second transmittance corresponding to the second target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value;

[0014] The first pixel to be displayed is driven according to the second pixel data corresponding to the second target pixel unit.

[0015] In the aforementioned technical solution, when the first transmittance exceeds a transmittance threshold, it is typically forced to clamp to the threshold, resulting in overexposure, whitening, and loss of detail in the corresponding image. Furthermore, forcing the first transmittance to the threshold causes the actual emitted brightness of the sub-pixels to fall short of the expected brightness, disrupting the brightness balance of the red, green, and blue sub-fields and causing color shift. Therefore, after calculating the transmittance corresponding to the first target pixel unit, when the first transmittance exceeds the transmittance threshold, the first pixel data corresponding to the first target pixel unit is determined based on the gain coefficient, the first transmittance, and a preset pixel value. The first pixel data represents the ratio of the first transmittance corresponding to the first target pixel unit to the maximum transmittance of the pixel unit in the first sub-field image. The product of the value and the preset pixel value can maintain the relative brightness relationship between each pixel unit, avoiding the problem of brightness abrupt change and loss of detail caused by forcibly clamping the first transmittance to the transmittance threshold, resulting in overexposure. In the second subfield image, when the transmittance of the first target unit corresponding to the second target pixel unit is greater than the transmittance threshold, the second pixel data corresponding to the second target pixel unit is determined according to the gain coefficient, the second transmittance and the preset pixel value. This allows the pixel units corresponding to the same pixel in different subfield images to continue to use the same gain coefficient, ensuring that the emitted brightness of the same pixel in the red, green and blue subfield images can maintain the preset ratio, avoiding the problem of color shift caused by the imbalance of color brightness ratio, and improving the display quality of the display device.

[0016] In some embodiments, after generating the first transmittance corresponding to each pixel unit in the first partition image based on the image information of the first partition image, the controller is further configured to:

[0017] When the first transmittance corresponding to the third target pixel unit is less than or equal to the transmittance threshold, the third pixel data corresponding to the third target pixel unit is generated according to the product of the first transmittance and the preset pixel value, wherein the third target pixel unit is a pixel unit in the first partition image whose first transmittance is less than or equal to the transmittance threshold.

[0018] Based on the third pixel data corresponding to the third target pixel unit, the second pixel to be displayed in the liquid crystal panel is driven, wherein the second pixel to be displayed is a pixel of the third target pixel unit whose first transmittance is less than or equal to the transmittance threshold;

[0019] After generating the second transmittance corresponding to each pixel unit in the second partition image based on the image information of the second partition image, the controller is further configured to:

[0020] The fourth pixel data corresponding to the fourth target pixel unit is generated based on the product of the second transmittance corresponding to the fourth target pixel unit and the preset pixel value, wherein the fourth target pixel unit is the pixel unit in the second partition image corresponding to the second pixel to be displayed;

[0021] The second pixel to be displayed is driven according to the fourth pixel data corresponding to the fourth target pixel unit.

[0022] In the above technical solution, when the transmittance is less than or equal to the transmittance threshold, the transmittance is multiplied by the preset pixel value to generate pixel data. This eliminates the need for the controller to introduce an additional gain coefficient for mapping calculation, avoiding the risk of overcompensation that may result from introducing a gain coefficient for mapping calculation, and ensuring the accuracy and consistency of pixel driving in normal areas.

[0023] In some embodiments, the image information of the first partition image includes the initial image signal corresponding to each pixel unit in the first partition image;

[0024] The step of generating the first transmittance corresponding to each pixel unit in the first partition image based on the image information of the first partition image includes:

[0025] The initial image signal corresponding to each pixel unit in the first partition image is linearized to obtain the target image signal corresponding to each pixel unit.

[0026] Based on the target image signal corresponding to each pixel unit, determine the target backlight data corresponding to each pixel unit in the first partition image;

[0027] The first transmittance corresponding to each pixel unit is obtained based on the ratio between the target image signal corresponding to each pixel unit and the corresponding target backlight data.

[0028] In the above technical solution, the initial image signal is linearized to obtain the target image signal, and then the target backlight data is determined based on the target image signal. The first transmittance is determined by the ratio between the target image signal and the corresponding target backlight data. This allows the target image signal and the target backlight data to be calculated in the same linear space, avoiding transmittance calculation deviations caused by gamma characteristics and improving the accuracy of calculating the first transmittance of the first target pixel unit.

[0029] In some embodiments, the controller is further configured to:

[0030] Obtain the maximum transmittance of the pixel unit in the first subfield image;

[0031] Calculate the first product between the maximum transmittance and the preset pixel value;

[0032] The gain coefficient is obtained based on the ratio between the total pixel value and the first product, wherein the total pixel value is the sum of the preset pixel values ​​corresponding to the multiple sub-pixels included in a pixel.

[0033] In the above technical solution, the highest display requirement of the first subfield image is determined by calculating the first product between the maximum transmittance and the preset pixel value. Then, the gain coefficient is obtained by the ratio between the total pixel value corresponding to the pixel unit and the first product. This allows the gain coefficient to be dynamically adapted and adjusted in real time according to the actual transmittance of each frame of the image, accurately adapting to the display requirements of the first subfield image and the physical light transmission limitations of the subpixels. This avoids the problem of insufficient range extension due to an excessively small gain coefficient, which would still fail to meet the light transmission opening requirements in high transmittance scenarios. It also prevents the problem of excessively large gain coefficient causing range redundancy and reducing pixel driving accuracy, thus improving the rationality and reliability of the gain coefficient.

[0034] In some embodiments, determining the first pixel data corresponding to the first target pixel unit based on the gain coefficient, the first transmittance of the first target pixel unit, and a preset pixel value includes:

[0035] The first pixel data corresponding to the first target pixel unit is obtained by multiplying the gain coefficient, the first transmittance of the first target pixel unit, and the preset pixel value.

[0036] In the above technical solution, the first pixel data is obtained by multiplying the gain coefficient, the first transmittance and the preset pixel value. The pixel data can be accurately mapped from the range of preset pixel values ​​to the range of total pixel values ​​corresponding to the pixel unit, thereby achieving a wider range of light transmission drive, making the brightness level of the display screen of the display device more detailed and the display effect more stable.

[0037] In some embodiments, determining the second pixel data corresponding to the second target pixel unit based on the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value includes:

[0038] If the second transmittance of the second target pixel unit is less than the maximum transmittance, then the second pixel data corresponding to the second target pixel unit is obtained by multiplying the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value.

[0039] In the above technical solution, when the second transmittance of the second target pixel unit is less than the maximum transmittance, the second pixel data corresponding to the second target pixel unit is obtained by multiplying the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value. Thus, by continuing to use the same gain coefficient to generate pixel data for the same pixel, the pixel is processed with a uniform gain coefficient in the red, green, and blue subfield images. This ensures that the emitted brightness of the same pixel in the red, green, and blue subfield images can maintain a preset ratio, avoiding the problem of color shift caused by the imbalance of color brightness ratio, and improving the display quality of the display device.

[0040] In some embodiments, the controller is further configured to:

[0041] If the second transmittance of the second target pixel unit is greater than or equal to the maximum transmittance, then the second pixel data corresponding to the second target pixel unit is determined to be the total pixel value.

[0042] In the above technical solution, when the second transmittance of the second target pixel unit is greater than or equal to the maximum transmittance, the total pixel value is used as the second pixel data corresponding to the second target pixel unit. This can avoid excessive compression of the grayscale representation of the first pixel to be displayed on the second subfield image, so that the color brightness ratio of the first pixel to be displayed is as close as possible to the preset ratio, thereby reducing the imbalance of the color brightness ratio and reducing the degree of color shift that occurs when the second transmittance of the second target pixel unit is greater than or equal to the maximum transmittance.

[0043] In some embodiments, driving the first pixel to be displayed in the liquid crystal panel according to the first pixel data corresponding to the first target pixel unit includes:

[0044] Based on the first pixel data corresponding to the first target pixel unit, determine the driving data corresponding to each sub-pixel included in the first pixel to be displayed;

[0045] Based on the driving data corresponding to each sub-pixel of the first pixel to be displayed, drive each sub-pixel of the first pixel to be displayed in the liquid crystal panel.

[0046] In the above technical solution, by driving each sub-pixel of the first pixel to be displayed to achieve a wider range of light transmission control, it helps to improve the pixel control accuracy of the display device.

[0047] In some embodiments, the display device further includes:

[0048] The memory is used to store a preset mapping relationship, which is used to characterize the correspondence between pixel data and multiple driving data combinations. Each driving data combination includes driving data corresponding to multiple sub-pixels included in a pixel.

[0049] The step of determining the driving data corresponding to each sub-pixel of the first pixel to be displayed based on the first pixel data corresponding to the first target pixel unit includes:

[0050] Obtain the historical driving data combination corresponding to the third subfield image, wherein the third subfield image is the last subfield image displayed in the previous frame;

[0051] Based on the preset mapping relationship, multiple driving data combinations corresponding to the first pixel data are determined according to the first pixel data;

[0052] Calculate the absolute value of the difference between the historical driving data combination and the multiple driving data combinations corresponding to the first pixel data;

[0053] The driving data corresponding to the multiple sub-pixels contained in the driving data combination with the smallest absolute value of the difference between the driving data combination and the historical driving data combination are used as the driving data corresponding to each sub-pixel of the first pixel to be displayed.

[0054] In the above technical solution, by selecting the combination with the smallest difference from the historical driving data combination of the last displayed sub-field image in the previous frame from multiple candidate driving data combinations, the driving data of each sub-pixel in the first sub-field image can be made as close as possible to the previous state. This controls the change in the deflection angle of the liquid crystal molecules corresponding to each sub-pixel within a minimum range, avoids the response delay or overshoot caused by large deflection of liquid crystal molecules, shortens the liquid crystal response time, and helps to improve the smoothness of brightness and color transition when switching between multiple sub-field images, thus achieving a smoother and more stable display effect.

[0055] The second aspect of this application discloses a control method for a display device, which is applied to the display device. The display device includes a backlight module and a liquid crystal panel. The backlight module includes multiple backlight zones, and any one of the backlight zones includes a red light source, a green light source, and a blue light source. The liquid crystal panel includes multiple pixels, and each pixel includes multiple sub-pixels. The liquid crystal panel is a liquid crystal panel without color filters.

[0056] The method includes:

[0057] The current frame image is parsed to obtain three subfield images, which correspond to red, green and blue respectively;

[0058] Based on the image information of the first partition image, a first transmittance corresponding to each pixel unit in the first partition image is generated, wherein the first partition image is a partition image corresponding to the first backlight partition in the first subfield image, the first subfield image is the first subfield image to be displayed in time, and the first backlight partition is any one of the plurality of backlight partitions.

[0059] When the first transmittance corresponding to the first target pixel unit is greater than the transmittance threshold, the first pixel data corresponding to the first target pixel unit is determined according to the gain coefficient, the first transmittance of the first target pixel unit and the preset pixel value. The first target pixel unit is a pixel unit in the first partition image whose first transmittance is greater than the transmittance threshold. The preset pixel value is the maximum pixel value that the sub-pixel can achieve. The first pixel data represents the product of the ratio of the first transmittance corresponding to the first target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value.

[0060] Based on the first pixel data corresponding to the first target pixel unit, drive the first pixel to be displayed in the liquid crystal panel, wherein the first pixel to be displayed is a pixel of the first target pixel unit whose first transmittance is greater than the transmittance threshold;

[0061] Based on the image information of the second partition image, a second transmittance corresponding to each pixel unit in the second partition image is generated. The second partition image is a partition image corresponding to the second backlight partition in the second subfield image. The second backlight partition is any one of the multiple backlight partitions. The second subfield image is a subfield image that is in sequence after the first subfield image. The second target pixel unit is a pixel unit in the second partition image corresponding to the first pixel to be displayed.

[0062] Based on the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value, the second pixel data corresponding to the second target pixel unit is determined, wherein the second pixel data represents the product of the ratio of the second transmittance corresponding to the second target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value;

[0063] The first pixel to be displayed is driven according to the second pixel data corresponding to the second target pixel unit. Attached Figure Description

[0064] To more clearly illustrate the implementation methods in some embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0065] Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0066] Figure 2 A schematic diagram illustrating the principle of field sequence display provided in an embodiment of this application;

[0067] Figure 3 A flowchart illustrating an evaluation method for a display device provided in this application embodiment;

[0068] Figure 4 A flowchart for determining the first transmittance provided in this application embodiment;

[0069] Figure 5 A flowchart for calculating the gain coefficient provided in this application embodiment;

[0070] Figure 6 A flowchart illustrating the process of driving each sub-pixel of the first pixel to be displayed, as provided in an embodiment of this application;

[0071] Figure 7 This is a flowchart illustrating the determination of driving data corresponding to each sub-pixel, as provided in an embodiment of this application. Detailed Implementation

[0072] To make the objectives, implementation methods and advantages of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only some embodiments of this application, and not all embodiments.

[0073] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0074] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclusively include, for example, a product or device that includes a series of components is not necessarily limited to those that are explicitly listed, but may include other components that are not explicitly listed or that are inherent to such product or device.

[0075] Figure 1This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 1 As shown, the display device may include a liquid crystal panel 110, a backlight module 120, and a controller 130. The liquid crystal panel 110 includes multiple pixels, each pixel includes multiple sub-pixels, and the liquid crystal panel 110 is a liquid crystal panel without color filters; the backlight module 120 includes multiple backlight zones, any backlight zone including a red light source, a green light source, and a blue light source.

[0076] A pixel unit can be the smallest display unit on the liquid crystal panel 110, and is the basic module for displaying images on the display device 100. Multiple pixel units in the liquid crystal panel 110 are arranged in rows and columns to form a complete display array. The number and spacing of the pixel units directly determine the physical resolution of the display device 100.

[0077] A subpixel can be the smallest light-emitting display unit on the liquid crystal panel 110. The controller 130 can control the deflection of the liquid crystal in the subpixel by applying different driving voltages to the subpixel, thereby adjusting the backlight transmittance of the corresponding backlight module 120 in the subpixel, so as to achieve more refined control over the brightness and color of the pixel unit.

[0078] The backlight partition can be the smallest light-emitting unit in the backlight module 120. Each backlight partition can independently adjust the brightness of the red light source, green light source and blue light source contained therein, so as to coordinate with the transmittance of the pixels in the LCD panel 110 corresponding to each backlight partition, and realize the brightness modulation of the color components corresponding to the image of each backlight partition.

[0079] The controller 130 is connected to the LCD panel 110 and the backlight module 120 respectively. The controller 130 is configured to receive video input signals or image input signals, obtain image data from the video input signals or image input signals, perform format conversion, backlight data generation processing and pixel data generation processing on the image data, and output backlight data and pixel data. The backlight module 120 adjusts the current of the light source in each backlight zone according to the backlight data, thereby adjusting the brightness of the light source. The LCD panel 110 adjusts the magnitude and direction of the provided electric field according to the pixel data to control the arrangement of liquid crystal molecules, thereby adjusting the degree of backlight transmission (i.e., transmittance) provided by the backlight module 120, thereby displaying the display screen corresponding to the video input signal or image input signal.

[0080] In some embodiments, the backlight module 120 may be a direct-lit backlight module or a side-lit backlight module.

[0081] In a direct-lit backlight module, multiple light sources are evenly arranged on the back of the LCD panel 110, and the light emitted by the light sources shines vertically upwards directly onto the LCD panel 110. In a side-lit backlight module, multiple light sources are concentrated on the side of the LCD panel 110, and the light emitted by the light sources is refracted and homogenized by a light guide plate before being transmitted to the back of the LCD panel 110.

[0082] Figure 2 This is a schematic diagram illustrating the principle of field sequence display provided in an embodiment of this application. Figure 2 As shown, the controller 130 can decompose the current frame image 204 into a subfield image 201 corresponding to red, a subfield image 202 corresponding to green, and a subfield image 203 corresponding to blue.

[0083] A subfield image can refer to a grayscale image obtained by splitting a single full-color image into multiple color channels based on a field-sequence color display mechanism. Each subfield image typically carries only the brightness and pixel distribution information of a single primary color and is the basic image unit output sequentially in the field-sequence display mode.

[0084] According to a preset timing sequence, the controller 130 first controls the red light source corresponding to each backlight zone in the backlight module 120 to emit red light, driving the LCD panel 110 to display the sub-field image 201 corresponding to red. Then, it controls the green light source corresponding to each backlight zone in the backlight module 120 to emit green light, driving the LCD panel 110 to display the sub-field image 202 corresponding to green. Next, it controls the blue light source corresponding to each backlight zone in the backlight module 120 to emit blue light, driving the LCD panel 110 to display the sub-field image 203 corresponding to blue. Thus, by utilizing the persistence of vision effect of the human eye, the user perceives the current frame image 204 displayed in color.

[0085] In some embodiments, the controller 130 may use the green-corresponding subfield image 202 as the first subfield image to be displayed in a timing sequence.

[0086] Because there is a time delay in the switching between the red subfield image 201, the green subfield image 202, and the blue subfield image 203 during the field sequence display process, when the human eye moves its gaze quickly, each subfield image will form a misaligned projection on the retina. This causes the three primary colors of light that should be superimposed and synthesized to be spatially separated, allowing the user to observe color edges or discrete color stripes, i.e., color separation. Since the human eye is most sensitive to green light and less sensitive to red and blue light, the green subfield image 202 is displayed first in the sequence. This ensures that the human eye receives the green information, which contributes the most brightness and is perceived most strongly, at the first moment. The red subfield image 201 and the blue subfield image 203, which are displayed subsequently, are less sensitive to human eye. Even if there is a slight misalignment between them due to gaze movement and the green subfield image 202, the resulting color deviation is easily masked or ignored by the visual system, making the human eye unable to perceive color separation, thus effectively suppressing the color separation phenomenon.

[0087] Optionally, the controller 130 may also use the red-corresponding subfield image 201 or the blue-corresponding subfield image 203 as the first subfield image to be displayed in the timing sequence, without making any specific limitations here.

[0088] In some embodiments, the subfield image 202 corresponding to green can be a mixed color field, and the subfield image 201 corresponding to red and the subfield image 203 corresponding to blue can be pure color fields.

[0089] A pure color field refers to a monochromatic subfield that outputs only a single primary color backlight without any other mixed colors. A mixed color field refers to a composite subfield that uses a primary color backlight as the main element and mixes in trace amounts of other primary colors. For example, the subfield image 202 corresponding to green is a composite color subfield that uses green as the main color and mixes in trace amounts of red or blue light. Compared to a pure green subfield, a greenish mixed color field can further weaken the color discontinuity of time-series transitions while maintaining the high brightness output of green, thus improving the visual comfort of the image. Therefore, by first displaying the greenish subfield image 202, and then displaying the pure red subfield image 201 and the pure blue subfield image 203, the color details of the current frame image 204 can be preserved while further suppressing color separation.

[0090] Optionally, the subfield image 201 corresponding to red can be a mixed color field, and the subfield image 202 corresponding to green and the subfield image 203 corresponding to blue can be pure color fields; or, the subfield image 203 corresponding to blue can be a mixed color field, and the subfield image 202 corresponding to green and the subfield image 201 corresponding to red can be pure color fields, without specific limitations here.

[0091] In some embodiments, the controller 130 can calculate the transmittance corresponding to each pixel unit based on the image information and backlight data corresponding to each pixel unit in the subfield image.

[0092] The image information corresponding to each pixel unit in the subfield image may include the grayscale value corresponding to each pixel unit in the subfield image. The grayscale value corresponding to each image pixel can be used to characterize the display brightness requirement of the pixel unit corresponding to each image pixel. The larger the grayscale value of the image pixel, the higher the display brightness requirement of the corresponding pixel unit.

[0093] Backlight data refers to the quantitative parameters of the output brightness of the backlight module 120. The larger the backlight data, the higher the luminous brightness of the light source in the backlight module 120.

[0094] Transmittance refers to the proportion of light allowed to pass through the backlight module 120 by a single pixel in the liquid crystal panel 110 under the control of the corresponding electric field. The transmittance value is usually in the range of 0 to 1. The larger the value, the more light the pixel transmits and the brighter the corresponding area is. When the transmittance is 0, it means that the pixel is completely opaque. At this time, the liquid crystal molecules corresponding to the pixel are deflected to an angle that completely blocks the backlight light under the action of the electric field. When the transmittance is 1, it means that the pixel is completely transparent. That is, the liquid crystal molecules are deflected to the maximum opening, allowing the backlight light to pass through with almost no attenuation.

[0095] It should be noted that since the backlight module 120 usually cannot achieve independent backlight control at the pixel level, it is often difficult to take into account the different backlight requirements of extremely bright and extremely dark areas in an image. For example, in the case of a high-contrast image of stars in a deep night sky, stars only occupy a very small pixel area in a backlight zone, and most of the area is black. This results in the backlight data of the backlight zone being dominated by black, and the calculated backlight data of the backlight zone is small. However, the gray value corresponding to the stars is usually high, so the transmittance value of the pixel corresponding to the stars is usually greater than 1.

[0096] In related technologies, since the actual transmittance of liquid crystal cannot be greater than 1, in order to match the calculated transmittance value with the actual transmittance of liquid crystal, when the calculated transmittance value is greater than 1, the calculated transmittance value is usually forced to clamp to 1 so that the liquid crystal deflection reaches the maximum angle. This causes the image displayed by the corresponding pixel to be too bright and white, and lose details, resulting in overexposure. Furthermore, when the first transmittance is forced to clamp to the transmittance threshold, the actual emitted brightness of the sub-pixel does not reach the expected emitted brightness, breaking the brightness ratio balance of the red, green and blue sub-field images and causing color shift.

[0097] In this embodiment, after calculating the transmittance corresponding to the first target pixel unit, if the first transmittance is greater than the transmittance threshold, the first pixel data corresponding to the first target pixel unit is determined according to the gain coefficient, the first transmittance, and the preset pixel value. The first pixel data represents the product of the ratio of the first transmittance corresponding to the first target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value. This allows the relative brightness relationship between each pixel unit to be maintained, avoiding the problem of brightness abrupt change and loss of detail caused by forcibly clamping the first transmittance to the transmittance threshold, resulting in overexposure. Furthermore, in the second subfield image, if the transmittance of the first target unit corresponding to the second target pixel unit is greater than the transmittance threshold, the second pixel data corresponding to the second target pixel unit is determined according to the gain coefficient, the second transmittance, and the preset pixel value. This allows the pixel units corresponding to the same pixel in different subfield images to continue to use the same gain coefficient, ensuring that the emitted brightness of the same pixel in the red, green, and blue subfield images can maintain a preset ratio, avoiding the problem of color shift caused by the imbalance of color brightness ratio, and improving the display quality of the display device.

[0098] Figure 3 A flowchart illustrating an evaluation method for a display device provided in an embodiment of this application. Figure 3 As shown, the method may include the following steps:

[0099] Step 301: Analyze the current frame image to obtain three subfield images.

[0100] The current frame image is a color RGB image, with three sub-field images corresponding to red, green, and blue, respectively. The sub-field images corresponding to red, green, and blue can all be solid color field images, or the sub-field images corresponding to red and blue can be solid color field images, while the sub-field image corresponding to green can be a mixed color field image, but this is not limited to these.

[0101] In some embodiments, the controller can perform channel separation on the current frame image, extract the gray values ​​of all pixels in the current frame image that belong to the same primary color, and obtain sub-field images corresponding to the three primary colors of red, green and blue respectively.

[0102] Alternatively, after obtaining the subfield images corresponding to the three primary colors of red, green and blue, the controller can, according to the preset color mixing requirements, superimpose and fuse the grayscale information of two or more primary colors and assign weights to obtain a mixed color field image with a greenish tint.

[0103] Optionally, the controller can also perform channel separation on the current frame image to obtain four sub-field images: sub-field images corresponding to the three primary colors of red, green, and blue, and sub-field images corresponding to the colors.

[0104] In some embodiments, the controller may first preprocess the current frame image, and then perform channel separation on the preprocessed current frame image to obtain sub-field images corresponding to red, green and blue respectively. The preprocessing includes one or more of noise filtering, grayscale calibration and contrast enhancement.

[0105] Step 303: Based on the image information of the first partition image, generate the first transmittance corresponding to each pixel unit in the first partition image.

[0106] The first partition image is the partition image corresponding to the first backlight partition in the first subfield image. The first subfield image is the first subfield image to be displayed in the time sequence. The first backlight partition is any one of the multiple backlight partitions.

[0107] It should be noted that each pixel unit in the first partition image corresponds one-to-one with each pixel to be displayed in the first partition image of the LCD panel.

[0108] In some embodiments, the image information of the first partition image includes the initial image signal corresponding to each pixel unit in the first partition image.

[0109] Figure 4 A flowchart for determining a first transmittance provided in an embodiment of this application. For example... Figure 4 As shown, step 303 may include steps 402 to 406.

[0110] Step 402: Linearize the initial image signal corresponding to each pixel unit in the first partition image to obtain the target image signal corresponding to each pixel unit.

[0111] In one implementation, the controller can calculate the ratio between the initial image signal corresponding to each pixel unit and the preset pixel value, and then perform an exponential operation on the ratio corresponding to each pixel unit according to the gamma parameter to obtain the target image signal of each pixel unit, thereby completing the linearization processing of the initial image signal corresponding to each pixel unit in the first partition image.

[0112] The preset pixel value is the maximum pixel value that a subpixel can achieve.

[0113] As one implementation method, the preset pixel value can be the physical upper limit of the sub-pixel, 255; or, the preset pixel value can also be the maximum pixel value that the sub-pixel can actually use to avoid saturation distortion or overdrive problems. For example, the preset pixel value can be 200. When the pixel data is less than 200, the pixel can work in the linear response range and will not have problems such as liquid crystal response hysteresis or brightness compression. However, when the pixel data is greater than 200, the pixel is prone to enter the nonlinear region or drive saturation region, causing problems such as grayscale truncation, loss of detail and color distortion.

[0114] For example, the initial image signal corresponding to one pixel unit is 240, the preset pixel value is 255, and the gamma parameter is 2.2. Therefore, the controller can adjust the signal according to the given information. The calculated target image signal for this pixel unit is 0.88.

[0115] Step 404: Determine the target backlight data corresponding to each pixel unit in the first partition image based on the target image signal corresponding to each pixel unit.

[0116] In some embodiments, the controller can perform backlight extraction processing on the target image signals corresponding to multiple pixel units in the first partition image to obtain the first backlight data corresponding to the first partition image.

[0117] The controller can use the maximum value, average value or weighted value of the target image signal corresponding to each pixel unit in the first partition image as the backlight data corresponding to the first backlight partition, thereby obtaining the first backlight data corresponding to the first partition image.

[0118] In some embodiments, the controller may perform backlight optimization processing on the first backlight data corresponding to each partition image to obtain the second backlight data corresponding to each partition image.

[0119] Backlight optimization processing includes filtering and / or allocation processing.

[0120] As one implementation, the filtering process may include Gaussian filtering. The controller may perform Gaussian filtering on the first backlight data corresponding to each partition image to obtain filtered first backlight data, so that the first backlight data transitions smoothly in space, avoiding brightness jumps or block effects caused by excessive differences in partition backlight brightness, and improving display uniformity.

[0121] In one implementation, the controller can allocate the first backlight data corresponding to each partition image. Allocation processing can refer to the reasonable allocation of backlight data for a single partition image based on the overall brightness distribution of the first sub-field image and the brightness weight of each partition image. For example, for a high-contrast image, the backlight brightness ratio of the backlight partition corresponding to the high-brightness partition image can be appropriately increased, while the backlight brightness ratio of the backlight partition corresponding to the low-brightness partition image can be decreased.

[0122] In some embodiments, the controller can perform backlight diffusion processing on the second backlight data corresponding to each partition image according to the backlight characteristics corresponding to the backlight module, so as to obtain the target backlight data corresponding to each pixel unit in the first partition image.

[0123] The backlight characteristics corresponding to the backlight module may include the brightness distribution or light attenuation law of multiple light sources corresponding to the backlight module in the current frame image of the corresponding resolution. Backlight diffusion processing refers to simulating the brightness contribution of a single light source to the current pixel unit and surrounding pixel units based on the diffusion, attenuation and superposition effects of light propagating in the backlight module, thereby obtaining the equivalent backlight data of each pixel unit under the combined action of multiple light sources.

[0124] It is understandable that when the light source of the backlight module emits light, the emitted light will spread into space. This means that a pixel unit may be affected by multiple light sources in different backlight zones. In other words, the actual backlight brightness of a pixel unit is determined by the diffusion and superposition of light from multiple light sources. Therefore, it is necessary to combine the backlight characteristics of the backlight module and consider the actual expansion characteristics of multiple light sources to accurately calculate the backlight data received by each pixel unit from each light source, so that the target backlight data of each pixel unit is closer to the actual light output performance of the backlight module.

[0125] In the above technical solution, the target image signal is sequentially subjected to backlight extraction, backlight optimization, and diffusion processing based on backlight characteristics. This enables the final target backlight data to more accurately reflect the actual light-emitting characteristics of the backlight module and the brightness requirements of the image content of the first partition image, thereby improving the accuracy of backlight control and avoiding brightness distortion or color shift caused by backlight estimation deviation, so that the display device can achieve better display effects.

[0126] Step 406: Based on the ratio between the target image signal corresponding to each pixel unit and the corresponding target backlight data, the first transmittance corresponding to each pixel unit is obtained.

[0127] For example, the first partition image includes four pixel units, and the initial image signals corresponding to the four pixel units are 100, 110, 150 and 120 respectively. The controller can perform linearization processing on the above four pixel units to obtain the target image signals corresponding to the four pixel units as 0.1275, 0.1573, 0.3112 and 0.1905 respectively. The controller can take the average value of the four target image signals, 0.1966, as the first backlight data corresponding to the first partition image. Then, through backlight optimization and diffusion processing based on backlight features, the target backlight data corresponding to the four pixel units in the first partition image are determined to be 0.21, 0.22, 0.2 and 0.21 respectively. Thus, according to the ratio between the target image signals and the target backlight data corresponding to the four pixel units, the first transmittance corresponding to the four pixel units is obtained as 0.61, 0.72, 1.56 and 0.91 respectively.

[0128] In the above technical solution, the initial image signal is linearized to obtain the target image signal, and then the target backlight data is determined based on the target image signal. The first transmittance is determined by the ratio between the target image signal and the corresponding target backlight data. This allows the target image signal and the target backlight data to be calculated in the same linear space, avoiding transmittance calculation deviations caused by gamma characteristics and improving the accuracy of calculating the first transmittance of the first target pixel unit.

[0129] Step 305: If the first transmittance corresponding to the first target pixel unit is greater than the transmittance threshold, determine the first pixel data corresponding to the first target pixel unit based on the gain coefficient, the first transmittance of the first target pixel unit and the preset pixel value.

[0130] Wherein, the first target pixel unit is a pixel unit in the first partition image whose first transmittance is greater than the transmittance threshold. The first pixel data represents the product of the ratio of the first transmittance corresponding to the first target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value. The transmittance threshold can be the maximum value of the actual transmittance of the liquid crystal, which is 1.

[0131] It should be noted that the first pixel data is only used to represent the product of the ratio of the first transmittance corresponding to the first target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and a preset pixel value. It does not mean that the first pixel data is equal to the value of the product. Rather, it means that when the liquid crystal of the pixel to be displayed corresponding to the maximum transmittance in the first subfield image is deflected to the maximum opening corresponding to the preset pixel value, the first target pixel unit can achieve a liquid crystal opening proportional to its transmittance relationship based on the product of the ratio of the first transmittance and the maximum transmittance and the preset pixel value, thereby enabling pixels with different transmittances to operate at a uniform maximum opening. Maintaining a linear correspondence of brightness levels under a reference standard helps to ensure a smooth transition of grayscale gradients and complete presentation of image details. This is especially true for areas where the first transmittance transitions smoothly, such as areas where the first transmittance smoothly transitions from 1.2 to 1.5. This product ensures that each pixel unit where the first transmittance smoothly transitions from 1.2 to 1.5 has a progressively increasing brightness, making the brightness difference between adjacent pixels in this area uniform and continuous. This avoids truncating the first transmittance of each pixel unit in this area to 1, which would cause the area to appear white and lose details, thereby improving the display accuracy of the display device.

[0132] The gain factor is used to map pixel data from the preset pixel values ​​corresponding to sub-pixels to the total pixel value corresponding to the pixel. The total pixel value is the sum of the preset pixel values ​​corresponding to the sub-pixels of a pixel. For example, if a pixel contains three sub-pixels, and each sub-pixel has a preset pixel value of 255, the total pixel value corresponding to the pixel is... .

[0133] In one implementation, the controller can determine the pixel data corresponding to the first target pixel unit based on the product between the first transmittance and the preset pixel value, and then map the pixel data corresponding to the first target pixel unit from the preset pixel value corresponding to the sub-pixel to the total pixel value corresponding to the pixel through the gain coefficient.

[0134] In some embodiments, the controller may determine the gain coefficient based on the maximum transmittance of the first subfield image, a preset pixel value, and the total pixel value.

[0135] Figure 5 A flowchart illustrating the calculation of the gain coefficient provided in an embodiment of this application. Figure 5 As shown, the method may further include the following steps:

[0136] Step 501: Obtain the maximum transmittance of the pixel unit in the first subfield image.

[0137] The controller can compare the first transmittance corresponding to each of the multiple pixel units contained in the first subfield image to determine the maximum transmittance.

[0138] Step 503: Calculate the first product between the maximum transmittance and the preset pixel value.

[0139] Step 505: Obtain the gain coefficient based on the ratio between the total pixel value and the first product.

[0140] For example, with a preset pixel value of 255 and a total pixel value of 765, and the maximum transmittance of the first subfield image being 1.4, the controller can calculate the first product between the maximum transmittance of 1.4 and the preset pixel value of 255 as 357, and then calculate the ratio between the total pixel value of 765 and the first product 357 to determine the gain coefficient as 2.14.

[0141] In the above technical solution, the highest display requirement of the first subfield image is determined by calculating the first product between the maximum transmittance and the preset pixel value. Then, the gain coefficient is obtained by the ratio between the total pixel value corresponding to the pixel unit and the first product. This allows the gain coefficient to be dynamically adapted and adjusted in real time according to the actual transmittance of each frame of the image, accurately adapting to the display requirements of the first subfield image and the physical light transmission limitations of the subpixels. This avoids the problem of insufficient range extension due to an excessively small gain coefficient, which would still fail to meet the light transmission opening requirements in high transmittance scenarios. It also prevents the problem of excessively large gain coefficient causing range redundancy and reducing pixel driving accuracy, thus improving the rationality and reliability of the gain coefficient.

[0142] In some embodiments, the controller may obtain the first pixel data corresponding to the first target pixel unit based on the product of the gain coefficient, the first transmittance of the first target pixel unit, and the preset pixel value.

[0143] For example, with a gain coefficient of 2.14 and a preset pixel value of 255, if the first transmittance of the first target pixel unit is 1.2, the controller can calculate the product of the gain coefficient 2.14, the first transmittance 1.2, and the preset pixel value 255 to obtain the first pixel data corresponding to the first target pixel unit as 655. Further, if the first transmittance of the first target pixel unit is the maximum transmittance of 1.4, then the first pixel data corresponding to the first target pixel unit is 765.

[0144] In the above technical solution, the first pixel data is obtained by multiplying the gain coefficient, the first transmittance and the preset pixel value. The pixel data can be accurately mapped from the range of preset pixel values ​​to the range of total pixel values ​​corresponding to the pixel unit, thereby achieving a wider range of light transmission drive, making the brightness level of the display screen of the display device more detailed and the display effect more stable.

[0145] Step 307: Drive the first pixel to be displayed in the liquid crystal panel according to the first pixel data corresponding to the first target pixel unit.

[0146] The first pixel to be displayed is the pixel of the first target pixel unit whose transmittance is greater than the transmittance threshold.

[0147] In some embodiments, the controller may drive a plurality of sub-pixels including the first pixel to be displayed in the liquid crystal panel according to the first pixel data corresponding to the first target pixel unit, so as to display the first subfield image.

[0148] Figure 6 A flowchart illustrating the driving process of the first pixel to be displayed, as provided in an embodiment of this application, is shown. Figure 6 As shown, step 307 may include steps 602 to 604.

[0149] Step 602: Determine the driving data corresponding to each sub-pixel of the first target pixel unit based on the first pixel data.

[0150] In some embodiments, the display device further includes a memory for storing a preset mapping relationship, which is used to characterize the correspondence between pixel data and multiple driving data combinations, wherein each driving data combination includes driving data corresponding to multiple sub-pixels included in a pixel.

[0151] For example, the memory may pre-store the mapping relationship between pixel data 600 and multiple driving data combinations. In the first driving data combination, the driving data corresponding to the multiple sub-pixels may be 180, 200 and 220 respectively. In the second driving data combination, the driving data corresponding to the multiple sub-pixels may be 190, 200 and 210 respectively. In the third driving data combination, the driving data corresponding to the multiple sub-pixels may be 150, 220 and 230 respectively.

[0152] The controller can determine the driving data combination corresponding to the first pixel data based on the first pixel data corresponding to the first target pixel unit, and thus obtain the driving data corresponding to each sub-pixel included in the first pixel to be displayed based on the driving data combination corresponding to the first pixel data.

[0153] Figure 7 This is a flowchart illustrating the determination of driving data corresponding to each sub-pixel, provided in an embodiment of this application. Figure 7 As shown, step 602 may include steps 701 to 707.

[0154] Step 701: Obtain the historical driving data combination corresponding to the third subfield image.

[0155] The third subfield image is the last subfield image displayed in the previous frame.

[0156] It is understandable that the deflection state of liquid crystal molecules in an LCD panel is continuous. Given the driving data corresponding to each sub-pixel in the first subfield image, the liquid crystal molecules need to switch from the deflection angle corresponding to the third subfield image to the deflection angle corresponding to the first subfield image. However, since the response speed of liquid crystal molecules is directly related to the change in deflection angle, the greater the fluctuation in deflection angle, the longer it takes for the liquid crystal to complete the orientation deflection, and the more likely the display device is to experience response delay and display overshoot. Therefore, in order to minimize the deflection amplitude of the liquid crystal, it is necessary to use the historical driving data combination corresponding to the third subfield image as a benchmark and find the driving data combination with the smallest deflection amplitude from multiple driving data combinations corresponding to the first pixel data. This will minimize the deflection angle of the liquid crystal while ensuring brightness requirements, thereby improving the response speed of the pixels.

[0157] Step 703: Based on the preset mapping relationship, determine multiple driving data combinations corresponding to the first pixel data according to the first pixel data.

[0158] Step 705: Calculate the absolute value of the difference between the historical driving data combination and the multiple driving data combinations corresponding to the first pixel data.

[0159] The controller can calculate the absolute value of the difference between the historical driving data corresponding to a sub-pixel in the historical driving data combination and the driving data of the corresponding sub-pixel in the target driving data combination, and use the sum of the absolute values ​​of the differences between the driving data corresponding to each sub-pixel as the absolute value of the difference between the historical driving data combination and the target driving data combination. The target driving data combination is any one of the multiple driving data combinations corresponding to the first pixel data.

[0160] For example, the driving data corresponding to multiple sub-pixels in the historical driving data combination are 150, 150 and 150 respectively, and the driving data corresponding to multiple sub-pixels in the target driving data combination are 160, 170 and 180 respectively. The controller can calculate the absolute value of the difference between the historical driving data 150 corresponding to the first sub-pixel and the driving data 160 of the corresponding sub-pixel in the target driving data combination, which is 10. Similarly, the absolute values ​​of the difference between the driving data corresponding to the other two sub-pixels can be calculated as 20 and 30 respectively, thereby determining that the absolute value of the difference between the historical driving data combination and the target driving data combination is 60.

[0161] Step 707: Take the driving data corresponding to each of the sub-pixels contained in the driving data combination with the smallest absolute value of the difference between the driving data combination and the historical driving data combination, and use it as the driving data corresponding to each sub-pixel of the first pixel to be displayed.

[0162] For example, the first pixel data corresponds to three driving data combinations. The controller can determine that the absolute values ​​of the differences between the historical driving data combinations and the three driving data combinations corresponding to the first pixel data are 60, 70 and 80 respectively. Then, the driving data corresponding to the multiple sub-pixels contained in the driving data combination with an absolute difference of 60 are used as the driving data corresponding to each sub-pixel included in the first pixel to be displayed.

[0163] In the above technical solution, by selecting the combination with the smallest difference from the historical driving data combination of the last displayed sub-field image in the previous frame from multiple candidate driving data combinations, the driving data of each sub-pixel in the first sub-field image can be made as close as possible to the previous state. This controls the change in the deflection angle of the liquid crystal molecules corresponding to each sub-pixel within a minimum range, avoids response delay or overshoot caused by large deflection of liquid crystal molecules, shortens the liquid crystal response time, and helps to improve the smoothness of brightness and color transition when displaying the first sub-field image, achieving a smoother and more stable display effect.

[0164] Step 604: Drive each sub-pixel of the first pixel to be displayed in the liquid crystal panel according to the driving data corresponding to each sub-pixel of the first pixel to be displayed.

[0165] It should be noted that in related technologies, multiple sub-pixels contained in a pixel are usually driven as a whole, that is, all sub-pixels within a pixel are driven synchronously without distinction, so that the pixel data corresponding to multiple sub-pixels are the same. For example, when all sub-pixels within a pixel are driven by pixel data 200, the pixel data corresponding to each sub-pixel is 200. This makes the first pixel data 600 corresponding to the pixel an integer multiple of the product of the minimum pixel adjustment step size 1 of the sub-pixel and the number of sub-pixels within the pixel. As a result, the pixel unit can only achieve staged jumps such as 600 to 603, 603 to 606, etc. with this product, but cannot achieve continuous adjustment such as 601, 602, etc., which has obvious defects of control redundancy and insufficient adjustment accuracy.

[0166] In this application, with a preset pixel value of 255, the first pixel data is obtained by multiplying the gain coefficient, the first transmittance, and the preset pixel value. Then, the driving data corresponding to each sub-pixel of the first pixel to be displayed is determined based on the first pixel data. This allows each sub-pixel of the first pixel to be displayed to work together to achieve a more refined continuous light transmission drive with a full range of 0~765 and non-integer multiple step sizes, instead of being limited to stage jumps. This eliminates the control redundancy caused by forced synchronization of factor pixels under traditional driving methods, releases the independent modulation potential of each sub-pixel, and makes the brightness level of the display screen of the display device more detailed and the display effect more stable.

[0167] Step 309: Based on the image information of the second partition image, generate the second transmittance corresponding to each pixel unit in the second partition image.

[0168] Wherein, the second partition image is the partition image corresponding to the second backlight partition in the second subfield image, the second backlight partition is any one of the multiple backlight partitions, the second subfield image is the subfield image that is sequentially after the first subfield image, and the second target pixel unit is the pixel unit corresponding to the first pixel to be displayed in the second partition image.

[0169] Since the method of generating the second transmittance corresponding to each pixel unit in the second partition image based on the image information of the second partition image in step 309 is the same as the method of generating the first transmittance corresponding to each pixel unit in the first partition image based on the image information of the first partition image in step 303, it will not be described again here.

[0170] Step 311: Determine the second pixel data corresponding to the second target pixel unit based on the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value.

[0171] The second pixel data represents the product of the ratio of the second transmittance corresponding to the second target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value.

[0172] Understandably, if the first transmittance of the first target pixel unit corresponding to a pixel in the first subfield image is greater than the transmittance threshold, the controller can determine the first pixel data of the first target pixel unit corresponding to that pixel in the first subfield image based on the gain coefficient, the first transmittance, and the preset pixel value. Therefore, in the second subfield image, the controller also needs to determine the second pixel data of the second target pixel unit corresponding to that pixel in the second subfield image based on the gain coefficient, the second transmittance, and the preset pixel value. This ensures that the pixel unit corresponding to that pixel in different subfield images can continue to use the same gain coefficient, thereby ensuring that the emitted brightness of the red, green, and blue subfield images can maintain the preset ratio, avoiding the problem of color shift caused by the imbalance of color brightness ratio, and improving the display quality of the display device.

[0173] In some embodiments, if the second transmittance of the second target pixel unit is less than the maximum transmittance, the controller may obtain the second pixel data corresponding to the second target pixel unit based on the product of the gain coefficient, the second transmittance of the second target pixel unit, and a preset pixel value.

[0174] For example, with a maximum transmittance of 1.4 and a gain coefficient of 2.14, if the second transmittance of the second target pixel unit is 1.3, the controller can obtain the second pixel data corresponding to the second target pixel unit as 710 based on the product of the gain coefficient 2.14, the second transmittance of the second target pixel unit 1.3, and the preset pixel value 255.

[0175] In the above technical solution, when the second transmittance of the second target pixel unit is less than the maximum transmittance, the second pixel data corresponding to the second target pixel unit is obtained by multiplying the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value. Thus, by continuing to use the same gain coefficient to generate pixel data for the same pixel, the pixel is processed with a uniform gain coefficient in the red, green, and blue subfield images. This ensures that the emitted brightness of the same pixel in the red, green, and blue subfield images can maintain a preset ratio, avoiding the problem of color shift caused by the imbalance of color brightness ratio, and improving the display quality of the display device.

[0176] In some embodiments, the controller may determine the second pixel data corresponding to the second target pixel unit as the total pixel value if the second transmittance of the second target pixel unit is greater than or equal to the maximum transmittance.

[0177] It is understandable that the transmittance corresponding to each pixel unit in each subfield image is calculated based on the image information of the partitioned image in the corresponding subfield image, without involving the image information of other subfield images. Therefore, the transmittance in the second subfield image may be greater than the maximum transmittance of the first subfield image. However, since the controller obtains the second pixel data corresponding to each pixel unit in the second subfield image after driving the first pixel to be displayed in the liquid crystal panel to display the first subfield image according to step 307, the gain coefficient is determined only by the transmittance information of the first subfield image and is not affected by the greater transmittance in subsequent subfield images. Therefore, in the second target image If the second transmittance of a pixel cell is greater than or equal to the maximum transmittance, and the second pixel data of the second target pixel cell is determined based on the gain coefficient, the second transmittance of the second target pixel cell, and the preset pixel value, the second pixel data will exceed the upper limit of the total pixel value. This will cause the second pixel data to exceed the physical range that the LCD panel can drive, making it impossible to achieve the actual grayscale output corresponding to the second pixel data. Therefore, it is necessary to truncate the second pixel data to the total pixel value and use the total pixel value as the second pixel data corresponding to the second target pixel cell whose second transmittance is greater than or equal to the maximum transmittance, so as to avoid invalid driving or data overflow problems caused by exceeding the upper limit.

[0178] For example, when the maximum transmittance is 1.4 and the total pixel value is 765, if the second transmittance of the second target pixel unit is 1.5, the controller can directly determine that the second pixel data corresponding to the second target pixel unit is 765.

[0179] In the above technical solution, when the second transmittance of the second target pixel unit is greater than or equal to the maximum transmittance, the total pixel value is used as the second pixel data corresponding to the second target pixel unit. This can avoid excessive compression of the grayscale representation of the first pixel to be displayed on the second subfield image, so that the color brightness ratio of the first pixel to be displayed is as close as possible to the preset ratio, thereby reducing the imbalance of the color brightness ratio and reducing the degree of color shift that occurs when the second transmittance of the second target pixel unit is greater than or equal to the maximum transmittance.

[0180] Step 313: Drive the first pixel to be displayed according to the second pixel data corresponding to the second target pixel unit.

[0181] Step 313, which drives the first pixel to be displayed based on the second pixel data corresponding to the second target pixel unit, is the same as step 307, which drives the first pixel to be displayed in the liquid crystal panel based on the first pixel data corresponding to the first target pixel unit. Therefore, it will not be described again here.

[0182] In this embodiment, when the first transmittance is greater than the transmittance threshold, the first transmittance is usually forcibly clamped to the transmittance threshold, resulting in overexposure, whitening, and loss of detail in the corresponding image. Furthermore, when the first transmittance is forcibly clamped to the transmittance threshold, the actual emitted brightness of the sub-pixel does not reach the expected emitted brightness, disrupting the brightness balance of the red, green, and blue sub-fields and causing color shift. Therefore, after calculating the transmittance corresponding to the first target pixel unit, when the first transmittance is greater than the transmittance threshold, the first pixel data corresponding to the first target pixel unit is determined based on the gain coefficient, the first transmittance, and a preset pixel value. The first pixel data represents the ratio of the first transmittance corresponding to the first target pixel unit to the maximum transmittance of the pixel unit in the first sub-field image. The product of the first transmittance and the preset pixel value maintains the relative brightness relationship between each pixel unit, avoiding the problem of overexposure caused by brightness abrupt changes and loss of detail when the first transmittance is forcibly clamped to the transmittance threshold. In the second subfield image, when the transmittance of the first target unit corresponding to the second target pixel unit is greater than the transmittance threshold, the second pixel data corresponding to the second target pixel unit is determined according to the gain coefficient, the second transmittance and the preset pixel value. This allows the pixel units corresponding to the same pixel in different subfield images to continue to use the same gain coefficient, ensuring that the emitted brightness of the same pixel in the red, green and blue subfield images can maintain the preset ratio, avoiding the problem of color shift caused by the imbalance of color brightness ratio, and improving the display quality of the display device.

[0183] In some embodiments, after generating the first transmittance corresponding to each pixel unit in the first partition image based on the image information of the first partition image, if the first transmittance corresponding to the third target pixel unit is less than or equal to the transmittance threshold, the controller generates the third pixel data corresponding to the third target pixel unit based on the product of the first transmittance and the preset pixel value, and drives the second pixel to be displayed in the liquid crystal panel based on the third pixel data corresponding to the third target pixel unit.

[0184] The third target pixel unit is a pixel unit in the first partition image whose first transmittance is less than or equal to the transmittance threshold, and the second pixel to be displayed is a pixel of the third target pixel unit whose first transmittance is less than or equal to the transmittance threshold.

[0185] After generating the second transmittance corresponding to each pixel unit in the second partition image based on the image information of the second partition image, the controller can generate the fourth pixel data corresponding to the fourth target pixel unit based on the product of the second transmittance corresponding to the fourth target pixel unit and the preset pixel value.

[0186] The second pixel to be displayed is driven based on the fourth pixel data corresponding to the fourth target pixel unit.

[0187] The fourth target pixel unit is the pixel unit in the second partition image that corresponds to the second pixel to be displayed.

[0188] In the above technical solution, when the transmittance is less than or equal to the transmittance threshold, the transmittance is multiplied by the preset pixel value to generate pixel data. This eliminates the need for the controller to introduce an additional gain coefficient for mapping calculation, avoiding the risk of overcompensation that may result from introducing a gain coefficient for mapping calculation, and ensuring the accuracy and consistency of pixel driving in normal areas.

[0189] In some embodiments, if the second transmittance corresponding to the fourth target pixel unit is greater than the transmittance threshold, the controller may use a preset pixel value as the fourth pixel data corresponding to the fourth target pixel unit to avoid the product of the second transmittance corresponding to the fourth target pixel unit and the preset pixel value exceeding the preset pixel value.

[0190] Specifically, the steps by which the controller controls the LCD panel to display a frame of RGB image are as follows:

[0191] The controller obtains the current frame RGB image from an external input port or network port through the built-in SOC (System On Chip). It then separates the current frame RGB image into three subfield images: one for green, one for red, and one for blue. The green subfield image is used as the first subfield image to be displayed, while the red and blue subfield images are used as the second and third subfield images to be displayed, respectively.

[0192] In this sub-field image, the four pixel units in the first partition of the green sub-field image correspond to pixels A, B, C, and D on the liquid crystal panel. Similarly, the four pixel units in the second partition of the red and blue sub-field images also correspond to pixels A, B, C, and D on the liquid crystal panel. The initial image signals of the pixel units corresponding to pixels A, B, C, and D in the green sub-field image are 100, 110, 150, and 120, respectively, and the initial image signals of the pixel units corresponding to pixels A, B, C, and D in the red and blue sub-field images are 190, 200, 210, and 220, respectively.

[0193] The controller can generate the first transmittance of the first target pixel unit corresponding to pixels A, B, C and D respectively as 0.61, 0.72, 1.56 and 0.91 according to the initial image signals corresponding to the four pixel units in the green subfield image, and determine the gain coefficient as 1.5 according to the maximum transmittance of the first subfield image.

[0194] For pixels A, B, and D, since the first transmittance of their corresponding first target pixel units is less than 1, the controller can determine the third pixel data of the third target pixel units corresponding to pixels A, B, and D as 155, 183, and 232 respectively, based on the product of the first transmittance and the preset pixel value 255. The controller then determines the driving data of the three sub-pixels included in pixel A as 155, 155, and 155 respectively, the driving data of the three sub-pixels included in pixel B as 180, 180, and 189 respectively, and the driving data of the three sub-pixels included in pixel D as 230, 232, and 234 respectively, by looking up a table.

[0195] For pixel C, since the first transmittance of its corresponding first target pixel unit is greater than 1, the controller can determine the first pixel data of the first target pixel unit corresponding to pixel C as 597 based on the product of gain coefficient 1.5, first transmittance 1.56 and preset pixel value 255, and determine the driving data of the three sub-pixels included in pixel C as 200, 200 and 197 respectively by looking up a table.

[0196] The controller can drive the three sub-pixels of pixel units A, B, C and D respectively according to the driving data 155, 155 and 155 of the three sub-pixels of pixel A, the driving data 180, 180 and 189 of the three sub-pixels of pixel B, the driving data 200, 200 and 197 of the three sub-pixels of pixel C, and the driving data 230, 232 and 234 of the three sub-pixels of pixel D, so as to complete the display of the sub-field image corresponding to green.

[0197] After the controller controls the LCD panel to display the subfield image corresponding to green, the controller can generate the second transmittance of the second target pixel units corresponding to pixels A, B, C and D respectively, which are 0.84, 0.95, 1.02 and 1.17 respectively, based on the initial image signals corresponding to the above four pixel units in the subfield image corresponding to red.

[0198] For pixels A and B, the controller can determine the fourth pixel data of the fourth target pixel unit corresponding to pixels A and B as 215 and 243 respectively, based on the product of the second transmittance and the preset pixel value 255. The controller can also determine the driving data of the three sub-pixels included in pixel A as 215, 215 and 215 respectively by looking up a table, and determine the driving data of the three sub-pixels included in pixel B as 243, 243 and 243 respectively.

[0199] For pixel C, the controller can determine the first pixel data of the first target pixel unit corresponding to pixel C as 391 based on the product of gain coefficient 1.5, second transmittance 1.02 and preset pixel value 255, and determine the driving data of the three sub-pixels included in pixel C as 130, 130 and 131 respectively by looking up a table.

[0200] For pixel D, since the second transmittance of its corresponding fourth target pixel unit is greater than 1, the controller can use the preset pixel value 255 as the fourth pixel data of the fourth target pixel unit corresponding to pixel D, and determine the driving data of the three sub-pixels included in pixel D as 255, 255 and 255 respectively.

[0201] The controller can drive the three sub-pixels of pixel units A, B, C and D respectively according to the driving data 215, 215 and 215 of the three sub-pixels of pixel A, the driving data 243, 243 and 243 of the three sub-pixels of pixel B, the driving data 130, 130 and 131 of the three sub-pixels of pixel C, and the driving data 255, 255 and 255 of the three sub-pixels of pixel D, so as to complete the display of the sub-field image corresponding to red.

[0202] Similarly, the controller sequentially displays the subfield images corresponding to green, red, and blue through the above steps, allowing the user to perceive the RGB image of the current frame through the persistence of vision. Since the first transmittance of the first target pixel unit corresponding to pixel C in the first subfield image is greater than the transmittance threshold, if the three subfield images are displayed sequentially according to the traditional transmittance truncation method, pixel C will suffer from overexposure or color shift, affecting the user's viewing experience. However, by determining the first pixel data based on the gain coefficient, the first transmittance of the first target pixel unit corresponding to pixel C in the first subfield image, and the preset pixel value, not only can the relative brightness relationship between each pixel unit be maintained, avoiding overexposure caused by sudden brightness changes and loss of detail, but pixel C also continues to use the same gain coefficient in the second subfield image, ensuring that the first pixel data and the second pixel data of pixel C are both within the mapping range of the same gain coefficient. This ensures that the emitted brightness of pixel C in the red, green, and blue subfield images continues to maintain the preset ratio, avoiding color shift caused by an imbalance in the color brightness ratio.

[0203] This application also provides a computer-readable storage medium storing a computer program, wherein when the computer program is executed by a controller, the controller enables the controller to implement any of the control methods for display devices disclosed in this application.

[0204] This application discloses a computer program product, including a computer program that, when executed by a controller, causes the controller to implement any of the display device control methods disclosed in this application.

[0205] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0206] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they can be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0207] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0208] The foregoing has provided a detailed description of a display device and a control method for the display device disclosed in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A display device, characterized by comprising: include: The backlight module includes multiple backlight zones, each of which includes a red light source, a green light source, and a blue light source; LCD panel; It includes multiple pixels, each pixel includes multiple sub-pixels, and the liquid crystal panel is a liquid crystal panel without color filters; The controller is connected to both the backlight module and the LCD panel, and is configured to: The current frame image is parsed to obtain three subfield images, which correspond to red, green and blue respectively; The initial image signal corresponding to each pixel unit in the first partition image is linearized to obtain the target image signal corresponding to each pixel unit; wherein, the first partition image is the partition image corresponding to the first backlight partition in the first subfield image, the first subfield image is the first subfield image to be displayed in time sequence, and the first backlight partition is any one of the plurality of backlight partitions. Based on the target image signal corresponding to each pixel unit, determine the target backlight data corresponding to each pixel unit in the first partition image; The first transmittance corresponding to each pixel unit is obtained based on the ratio between the target image signal corresponding to each pixel unit and the corresponding target backlight data. When the first transmittance corresponding to the first target pixel unit is greater than the transmittance threshold, the first pixel data corresponding to the first target pixel unit is determined according to the gain coefficient, the first transmittance of the first target pixel unit and the preset pixel value. The first target pixel unit is a pixel unit in the first partition image whose first transmittance is greater than the transmittance threshold. The preset pixel value is the maximum pixel value that the sub-pixel can achieve. The first pixel data represents the product of the ratio of the first transmittance corresponding to the first target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value. Based on the first pixel data corresponding to the first target pixel unit, drive the first pixel to be displayed in the liquid crystal panel, wherein the first pixel to be displayed is a pixel of the first target pixel unit whose first transmittance is greater than the transmittance threshold; The initial image signal corresponding to each pixel unit in the second partition image is linearized to obtain the target image signal corresponding to each pixel unit; wherein, the second partition image is the partition image corresponding to the second backlight partition in the second subfield image, the second backlight partition is any one of the multiple backlight partitions, the second subfield image is the subfield image that is in time after the first subfield image, and the second target pixel unit is the pixel unit corresponding to the first pixel to be displayed in the second partition image; Based on the target image signal corresponding to each pixel unit, determine the target backlight data corresponding to each pixel unit in the second partition image; The second transmittance corresponding to each pixel unit is obtained based on the ratio between the target image signal corresponding to each pixel unit and the corresponding target backlight data. Based on the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value, the second pixel data corresponding to the second target pixel unit is determined, wherein the second pixel data represents the product of the ratio of the second transmittance corresponding to the second target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value; Drive the first pixel to be displayed based on the second pixel data corresponding to the second target pixel unit; The controller is also configured to: Obtain the maximum transmittance of the pixel unit in the first subfield image; Calculate the first product between the maximum transmittance and the preset pixel value; The gain coefficient is obtained based on the ratio between the total pixel value and the first product, wherein the total pixel value is the sum of the preset pixel values ​​corresponding to the multiple sub-pixels included in a pixel.

2. The display device according to claim 1, characterized in that, After obtaining the second transmittance corresponding to each pixel unit based on the ratio between the target image signal corresponding to each pixel unit and the corresponding target backlight data, the controller is further configured to: When the first transmittance corresponding to the third target pixel unit is less than or equal to the transmittance threshold, the third pixel data corresponding to the third target pixel unit is generated according to the product of the first transmittance and the preset pixel value, wherein the third target pixel unit is a pixel unit in the first partition image whose first transmittance is less than or equal to the transmittance threshold. Based on the third pixel data corresponding to the third target pixel unit, the second pixel to be displayed in the liquid crystal panel is driven, wherein the second pixel to be displayed is a pixel of the third target pixel unit whose first transmittance is less than or equal to the transmittance threshold; After obtaining the second transmittance corresponding to each pixel unit based on the ratio between the target image signal corresponding to each pixel unit and the corresponding target backlight data, the controller is further configured to: The fourth pixel data corresponding to the fourth target pixel unit is generated based on the product of the second transmittance corresponding to the fourth target pixel unit and the preset pixel value, wherein the fourth target pixel unit is the pixel unit in the second partition image corresponding to the second pixel to be displayed; The second pixel to be displayed is driven according to the fourth pixel data corresponding to the fourth target pixel unit.

3. The display device according to claim 1, characterized in that, The step of determining the first pixel data corresponding to the first target pixel unit based on the gain coefficient, the first transmittance of the first target pixel unit, and the preset pixel value includes: The first pixel data corresponding to the first target pixel unit is obtained by multiplying the gain coefficient, the first transmittance of the first target pixel unit, and the preset pixel value.

4. The display device according to claim 1, characterized in that, The step of determining the second pixel data corresponding to the second target pixel unit based on the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value includes: If the second transmittance of the second target pixel unit is less than the maximum transmittance, then the second pixel data corresponding to the second target pixel unit is obtained by multiplying the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value.

5. The display device according to claim 4, characterized in that, The controller is also configured to: If the second transmittance of the second target pixel unit is greater than or equal to the maximum transmittance, then the second pixel data corresponding to the second target pixel unit is determined to be the total pixel value.

6. The display device according to claim 1, characterized in that, The step of driving the first pixel to be displayed in the liquid crystal panel according to the first pixel data corresponding to the first target pixel unit includes: Based on the first pixel data corresponding to the first target pixel unit, determine the driving data corresponding to each sub-pixel included in the first pixel to be displayed; Based on the driving data corresponding to each sub-pixel of the first pixel to be displayed, drive each sub-pixel of the first pixel to be displayed in the liquid crystal panel.

7. The display device according to claim 6, characterized in that, The display device further includes: The memory is used to store a preset mapping relationship, which is used to characterize the correspondence between pixel data and multiple driving data combinations. Each driving data combination includes driving data corresponding to multiple sub-pixels included in a pixel. The step of determining the driving data corresponding to each sub-pixel of the first pixel to be displayed based on the first pixel data corresponding to the first target pixel unit includes: Obtain the historical driving data combination corresponding to the third subfield image, wherein the third subfield image is the last subfield image displayed in the previous frame; Based on the preset mapping relationship, multiple driving data combinations corresponding to the first pixel data are determined according to the first pixel data; Calculate the absolute value of the difference between the historical driving data combination and the multiple driving data combinations corresponding to the first pixel data; The driving data corresponding to the multiple sub-pixels contained in the driving data combination with the smallest absolute value of the difference between the driving data combination and the historical driving data combination are used as the driving data corresponding to each sub-pixel of the first pixel to be displayed.

8. A control method for a display device, characterized in that, The invention is applied to a display device, which includes a backlight module and a liquid crystal panel. The backlight module includes multiple backlight zones, and any one of the backlight zones includes a red light source, a green light source, and a blue light source. The liquid crystal panel includes multiple pixels, each pixel includes multiple sub-pixels, and the liquid crystal panel is a liquid crystal panel without a color filter; The method includes: The current frame image is parsed to obtain three subfield images, which correspond to red, green and blue respectively; The initial image signal corresponding to each pixel unit in the first partition image is linearized to obtain the target image signal corresponding to each pixel unit; wherein, the first partition image is the partition image corresponding to the first backlight partition in the first subfield image, the first subfield image is the first subfield image to be displayed in time sequence, and the first backlight partition is any one of the plurality of backlight partitions. Based on the target image signal corresponding to each pixel unit, determine the target backlight data corresponding to each pixel unit in the first partition image; The first transmittance corresponding to each pixel unit is obtained based on the ratio between the target image signal corresponding to each pixel unit and the corresponding target backlight data. When the first transmittance corresponding to the first target pixel unit is greater than the transmittance threshold, the first pixel data corresponding to the first target pixel unit is determined according to the gain coefficient, the first transmittance of the first target pixel unit and the preset pixel value. The first target pixel unit is a pixel unit in the first partition image whose first transmittance is greater than the transmittance threshold. The preset pixel value is the maximum pixel value that the sub-pixel can achieve. The first pixel data represents the product of the ratio of the first transmittance corresponding to the first target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value. Based on the first pixel data corresponding to the first target pixel unit, drive the first pixel to be displayed in the liquid crystal panel, wherein the first pixel to be displayed is a pixel of the first target pixel unit whose first transmittance is greater than the transmittance threshold; The initial image signal corresponding to each pixel unit in the second partition image is linearized to obtain the target image signal corresponding to each pixel unit; wherein, the second partition image is the partition image corresponding to the second backlight partition in the second subfield image, the second backlight partition is any one of the multiple backlight partitions, the second subfield image is the subfield image that is in time after the first subfield image, and the second target pixel unit is the pixel unit corresponding to the first pixel to be displayed in the second partition image; Based on the target image signal corresponding to each pixel unit, determine the target backlight data corresponding to each pixel unit in the second partition image; The second transmittance corresponding to each pixel unit is obtained based on the ratio between the target image signal corresponding to each pixel unit and the corresponding target backlight data. Based on the gain coefficient, the second transmittance of the second target pixel unit, and the preset pixel value, the second pixel data corresponding to the second target pixel unit is determined, wherein the second pixel data represents the product of the ratio of the second transmittance corresponding to the second target pixel unit and the maximum transmittance of the pixel unit in the first subfield image and the preset pixel value; Drive the first pixel to be displayed based on the second pixel data corresponding to the second target pixel unit; The method further includes: Obtain the maximum transmittance of the pixel unit in the first subfield image; Calculate the first product between the maximum transmittance and the preset pixel value; The gain coefficient is obtained based on the ratio between the total pixel value and the first product, wherein the total pixel value is the sum of the preset pixel values ​​corresponding to the multiple sub-pixels included in a pixel.

Images