Liquid crystal display device, image display method, electronic apparatus, and readable storage medium

Abstract

The invention discloses a liquid crystal display device, an image display method, electronic equipment and a readable storage medium. In a first working mode, a control circuit of the device receives display data of an mth frame of image, and controls the device to display n sub-field images to obtain the mth frame of image; the display data comprises initial gray scales under n primary colors; in one sub-field image of the mth frame of image, pixels comprise a target pixel, and the actual gray scale of the target pixel is an average value of the middle gray scale and the initial gray scales of T non-target pixels; the actual gray scale of at least part of non-target pixels is the initial gray scale; the target pixel at least meets one of a first condition and a second condition; the first condition is that the distance between a target point reflecting the color of the target pixel in the reference color space and a white point is smaller than a distance threshold value; the second condition is that the reference brightness of the target pixel is greater than a brightness threshold; and / or the contrast ratio of the target pixel is greater than a contrast ratio threshold value.

Description

Liquid crystal display device, image display method, electronic device and readable storage medium Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a liquid crystal display device, an image display method, an electronic device, and a readable storage medium. Background Art

[0002] Display panels are an indispensable part of electronic devices such as televisions and mobile phones, among which liquid crystal display panels are widely used. However, existing liquid crystal display panels suffer from high light loss and high energy consumption during the light output process.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in this field.

[0004] Summary of the Invention

[0005] The present disclosure provides a display device, an image display method, an electronic device, and a readable storage medium.

[0006] According to one aspect of the present disclosure, there is provided a liquid crystal display device, comprising a liquid crystal display panel and a control circuit, wherein the liquid crystal display panel comprises a plurality of pixels;

[0007] The control circuit includes a first operating mode, and in the first operating mode is configured to: upon receiving display data of an m-th frame image, control the liquid crystal display device to sequentially display n subfield images to obtain the m-th frame image; the display data includes an initial grayscale of each pixel under n primary colors; a hue of the subfield image is one of the primary colors, and different subfield images have different hues; m and n are positive integers, and n ≥ 2;

[0008] In any of the subfield images of the m-th frame image: the pixels include a target pixel and a non-target pixel, the non-target pixels include a plurality of neighboring pixels adjacent to the target pixel and non-neighboring pixels located outside the neighboring pixels; the actual grayscale of the target pixel is an average value of an intermediate grayscale determined based on its initial grayscale and the initial grayscales of T non-target pixels; the target pixel and the T non-target pixels are located within a first filtering template; the actual grayscales of at least some of the non-target pixels are their initial grayscales; T ≥ 1;

[0009] The target pixel satisfies at least one of a first condition and a second condition;

[0010] The first condition is that: in a target color gamut under a reference color space, the distance between a target point reflecting the target pixel color and a white point is less than a distance threshold;

[0011] The second condition is: the reference brightness of the target pixel determined based on the initial grayscale of the target pixel under the n primary colors is greater than a brightness threshold; and / or the contrast of the target pixel determined based on the reference brightness of the target pixel and the reference brightness of H adjacent neighboring pixels is greater than a contrast threshold; H≥1.

[0012] In an exemplary embodiment of the present disclosure, the intermediate grayscale is an average of an initial grayscale of the target pixel and initial grayscales of U non-target pixels; the target pixel and U non-target pixels are located within a second filtering template; U≥1.

[0013] In an exemplary embodiment of the present disclosure, under any of the subfield images of the m-th frame image:

[0014] The actual grayscale of the non-target pixel is an average of the initial grayscales of W non-target pixels including the non-target pixel and the actual grayscale of the target pixel; and the target pixel and the W non-target pixels are located in a third filtering template; W ≥ 2;

[0015] The third filtering template and the second filtering template have the same size.

[0016] In an exemplary embodiment of the present disclosure, under any of the subfield images of the m-th frame image:

[0017] The actual grayscale of at least one non-target pixel is an average of the initial grayscales of W non-target pixels including the non-target pixel; the W non-target pixels are located within a third filtering template, and the target pixel is located outside the third filtering template; W ≥ 2;

[0018] The third filtering template and the second filtering template have the same size.

[0019] In an exemplary embodiment of the present disclosure, the distance threshold is greater than or equal to Dmax and less than or equal to 1.4Dmax; Dmax is the maximum distance between a plurality of reference points in the edge of the target color gamut and the white point.

[0020] In an exemplary embodiment of the present disclosure, the number of the reference points is three, and the three reference points represent magenta, yellow, and cyan respectively in the target color gamut.

[0021] In an exemplary embodiment of the present disclosure, n=3, and the primary colors include red, green, and blue; the reference brightness of the target pixel and its initial grayscale satisfy the following relationship: gray=k1×R+k2×G+k3×B; k1<k3<k2;

[0022] gray is the reference brightness of the target pixel, R is the initial grayscale of the target pixel under red, G is the initial grayscale of the target pixel under green, and B is the initial grayscale of the target pixel under blue; k1, k3, and k2 are constants.

[0023] In an exemplary embodiment of the present disclosure, k1 is 0.114; k2 is 0.587; and k3 is 0.2989.

[0024] In an exemplary embodiment of the present disclosure, H is 4; the contrast of the target pixel satisfies the following formula:

[0025] C is the contrast of the target pixel; gray(i, j) is the reference brightness of the target pixel; gray(i, j+Δj) is a neighboring pixel adjacent to the target pixel in the first direction; gray(i+Δi, j) is a neighboring pixel adjacent to the target pixel in the second direction; the first direction and the second direction intersect.

[0026] In an exemplary embodiment of the present disclosure, 60≥the brightness threshold≥20; 900≥the contrast threshold≥225.

[0027] In an exemplary embodiment of the present disclosure, the control circuit further includes a second operating mode, and in the second operating mode is configured to: upon receiving the display data of the m-th frame image, control the liquid crystal display device to sequentially display n subfield images to obtain the m-th frame image;

[0028] In the second operating mode, the actual grayscale of the pixel is its initial grayscale.

[0029] In an exemplary embodiment of the present disclosure, the liquid crystal display panel includes:

[0030] An array substrate and a counter substrate arranged opposite to each other;

[0031] a liquid crystal layer, disposed between the array substrate and the counter substrate;

[0032] The liquid crystal display device further includes:

[0033] a backlight module, disposed on a side of the array substrate away from the counter substrate, and comprising light-emitting devices of n different colors, wherein the backlight module emits the same color of light when displaying the same subfield image and emits different colors of light when displaying different subfield images;

[0034] The control circuit is connected to the array substrate and the backlight module.

[0035] According to one aspect of the present disclosure, an electronic device is provided, including any one of the liquid crystal display devices described above.

[0036] In an exemplary embodiment of the present disclosure, the electronic device further includes:

[0037] An image acquisition device, configured to acquire an image of a user's eyeball;

[0038] An image processing device is used to determine the movement speed of the eyeball based on the image of the eyeball, and when the movement speed reaches a speed threshold, control the control circuit to be in the first working mode.

[0039] According to one aspect of the present disclosure, there is provided an image display method, which is used in a liquid crystal display device, wherein the liquid crystal display device includes a liquid crystal display panel and a control circuit, wherein the liquid crystal display panel includes a plurality of pixels. The image display method includes:

[0040] In the first working mode:

[0041] Receive display data of the m-th frame image, the display data including initial grayscales of the pixels under n primary colors; m and n are positive integers, and n≥2;

[0042] Under each of the primary colors, a pixel that satisfies at least one of the first condition and the second condition is a target pixel, and pixels other than the target pixel are non-target pixels; a plurality of pixels adjacent to the target pixel among the non-target pixels are neighborhood pixels, and pixels outside the neighborhood pixels among the non-target pixels are non-neighborhood pixels; the first condition is: in a target color gamut under a reference color space, the distance between a target point reflecting the pixel color and a white point is less than a distance threshold; the second condition is: a reference brightness of the target pixel determined based on an initial grayscale of the target pixel under n primary colors is greater than a brightness threshold; and / or a contrast of the target pixel determined based on a reference brightness of the target pixel and reference brightnesses of H adjacent neighborhood pixels is greater than a contrast threshold; H ≥ 1;

[0043] Under each primary color, a display step is performed to obtain an m-th frame image; the display step includes:

[0044] The average value of the intermediate grayscale determined based on the initial grayscale of the target pixel and the initial grayscales of T non-target pixels in the first filtering template is used as the actual grayscale of the target pixel; and the initial grayscales of at least some of the non-target pixels are used as their actual grayscales to display a subfield image of the mth frame image; the hue of the subfield image is the primary color, and different subfield images have different hues; T≥1.

[0045] In an exemplary embodiment of the present disclosure, the average value of the intermediate grayscale determined based on the initial grayscale of the target pixel and the initial grayscales of T non-target pixels in the first filtering template is used as the actual grayscale of the target pixel; comprising:

[0046] The average of the initial grayscale of the target pixel and the initial grayscales of U non-target pixels is used as the intermediate grayscale; the target pixel and U non-target pixels are located in the second filtering template; U ≥ 1;

[0047] An average value of the intermediate grayscale and the initial grayscales of the T non-target pixels in the first filtering template is used as the actual grayscale of the target pixel.

[0048] In an exemplary embodiment of the present disclosure, the displaying step further includes:

[0049] The average value of the initial grayscale of the W non-target pixels and the actual grayscale of the target pixel is used as the actual grayscale of one of the W non-target pixels; W≥2; and the target pixel and the W non-target pixels are located in a third filtering template; the third filtering template and the second filtering template have the same size.

[0050] In an exemplary embodiment of the present disclosure, the displaying step further includes:

[0051] The average value of the initial grayscales of the W non-target pixels is used as the actual grayscale of one of the W non-target pixels; W≥2; and the W non-target pixels are located within the third filtering template, and the target pixel is located outside the third filtering template; the third filtering template and the second filtering template are the same size.

[0052] In an exemplary embodiment of the present disclosure, the distance threshold is greater than or equal to Dmax and less than or equal to 1.4Dmax; Dmax is the maximum distance between a plurality of reference points in the edge of the target color gamut and the white point.

[0053] In an exemplary embodiment of the present disclosure, the number of the reference points is three, and the three reference points represent magenta, yellow, and cyan respectively in the target color gamut.

[0054] In an exemplary embodiment of the present disclosure, n=3, and the primary colors include red, green, and blue; the reference brightness of the target pixel and its initial grayscale satisfy the following relationship: gray=k1×R+k2×G+k3×B; k1<k3<k2;

[0055] Gray is the reference brightness of the target pixel, R is the grayscale of the target pixel under red, G is the grayscale of the target pixel under green, and B is the grayscale of the target pixel under blue.

[0056] In an exemplary embodiment of the present disclosure, k1 is 0.114; k2 is 0.587; and k3 is 0.2989.

[0057] In an exemplary embodiment of the present disclosure, H is 4; the contrast of the target pixel satisfies the following formula:

[0058] gray(i, j) is the reference brightness of the target pixel; gray(i, j+Δj) is a neighboring pixel adjacent to the target pixel in the first direction; gray(i+Δi, j) is a neighboring pixel adjacent to the target pixel in the second direction; the first direction and the second direction intersect.

[0059] In an exemplary embodiment of the present disclosure, 60≥the brightness threshold≥20; 900≥the contrast threshold≥225.

[0060] In an exemplary embodiment of the present disclosure, in the second working mode:

[0061] receiving the display data of the m-th frame image;

[0062] Under each primary color, n sub-field images are displayed in sequence with the initial grayscale of the pixel as the actual grayscale to obtain the m-th frame image.

[0063] According to one aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the image display method described above is implemented.

[0064] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and it is clear that those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0066] FIG1 is a schematic structural diagram of an embodiment of a liquid crystal display device disclosed herein.

[0067] FIG2 is a circuit diagram of an embodiment of a liquid crystal display device disclosed herein.

[0068] FIG3 is a partial schematic diagram of the mth frame image of the liquid crystal display device of the present disclosure in the first working mode.

[0069] 4 to 6 are schematic diagrams of three subfield images of the m-th frame image in FIG. 3 .

[0070] FIG7 is a schematic diagram of an embodiment of an electronic device disclosed herein.

[0071] FIG. 8 is a partially enlarged schematic diagram of an embodiment of a disclosed liquid crystal display device.

[0072] FIG9 is a schematic diagram showing the distribution of target pixels and neighboring pixels in an embodiment of a liquid crystal display device disclosed herein.

[0073] FIG10 is a schematic diagram showing the distribution of target pixels and neighboring pixels in another embodiment of the liquid crystal display device disclosed herein.

[0074] FIG11 is a schematic diagram showing coordinates of a target pixel and neighboring pixels in an embodiment of a liquid crystal display device disclosed herein.

[0075] FIG12 is a flow chart of an embodiment of the image generation method disclosed herein.

[0076] FIG13 is a flow chart of another embodiment of the image generation method disclosed herein.

[0077] FIG. 14 is a screen shot without adopting the solution disclosed in the present invention.

[0078] FIG15 is a screen shot of the solution disclosed herein. DETAILED DESCRIPTION

[0079] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent identical or similar structures, and thus their detailed description will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0080] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express open-ended inclusion and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.; the terms "first", "second", etc. are used only as labels and are not intended to limit the quantity of their objects.

[0081] The first direction X and the second direction Y herein are two directions intersecting each other, for example, perpendicular to each other, but are not limited to horizontal and vertical directions, and actual directions of the first direction X and the second direction Y may change as the position of the display panel changes.

[0082] In this article, two pixels being adjacent means that there are no other pixels between the two pixels. For example, there are no other pixels between a target pixel and its neighboring pixels.

[0083] The present disclosure provides a liquid crystal display device, as shown in FIG1 and FIG2 . The liquid crystal display device may include a liquid crystal display panel PNL and a control circuit CU, wherein:

[0084] The liquid crystal display panel PNL includes a plurality of pixels arranged in an array. A pixel in the liquid crystal display panel PNL of the present disclosure is the smallest light-emitting unit. Different pixels can emit different colors. The liquid crystal display panel PNL may include an array substrate TB, an opposing substrate FB, and a liquid crystal layer LL disposed between the array substrate TB and the opposing substrate FB.

[0085] The liquid crystal display panel PNL also includes pixel electrodes and common electrodes. The pixel electrodes can be provided on the array substrate TB, and the common electrodes can be provided on the array substrate TB or the counter substrate FB. Each pixel includes one pixel electrode. The array substrate TB includes a drive circuit. The control circuit CU can be provided on the array substrate TB. The drive circuit can control the voltage between the pixel electrode and the common electrode, thereby controlling the degree of deflection of the liquid crystal molecules in the liquid crystal layer LL, thereby controlling the transmittance of each pixel to light and adjusting the grayscale of each pixel.

[0086] The liquid crystal display device may further include a backlight module BLU, which may be disposed on a side of the array substrate TB away from the counter substrate FB. The backlight module BLU may emit light toward the array substrate TB under the control of the control circuit CU.

[0087] In some embodiments, the counter substrate (FB) may include a color filter layer comprising multiple filter sections. Each pixel may include one filter section. Through the filtering effect of the filter sections, each pixel emits monochromatic light, and different pixels can emit different colors. However, the color filter layer causes significant light loss, reducing the brightness of the LCD device without increasing the power of the backlight unit (BLU). Increasing the brightness requires increasing the power of the backlight unit (BLU), resulting in increased power consumption.

[0088] To improve light extraction efficiency without increasing power consumption, in some embodiments, the counter substrate FB may not be provided with a color filter layer to reduce light loss and improve light extraction efficiency. To achieve color display, the backlight module BLU can include light-emitting devices of n different colors. The number of light-emitting devices of the same color is not specifically limited and can be one or more. The color of the light emitted by the backlight module BLU represents the hue of the image. Based on this, field sequential display can be used when displaying images. For example, n subfield images are displayed sequentially within a frame. Each subfield image is a monochrome image. Within each subfield image, the grayscale of different pixels can be different, and the grayscale of the same pixel can be different in different subfield images. The backlight module BLU emits the same color when displaying the same subfield image, but emits different colors when displaying different subfield images. For example, when displaying each subfield image, only light-emitting devices of one color in the backlight module BLU emit light, so that each subfield image has only one hue, that is, one color. In this way, based on the phenomenon of persistence of vision, a single frame of image can be obtained.

[0089] Figures 4 to 6 show three subfield images. In different subfield images, the illuminated pixels P form multiple stripe patterns. The illuminated pixels in different subfield images can differ or overlap, meaning the same pixel can illuminate in all subfield images. The three subfield images form the mth frame image shown in Figure 3. It should be noted that Figure 3 is only used to illustrate the visual effect of the color mixing and formation of the three subfield images, and does not represent the subfield images.

[0090] In one embodiment, the backlight unit (BLU) may include three types of light-emitting devices, each capable of emitting red, green, and blue light. A single frame of image can be divided into three sub-field images, each with a red, green, and blue hue. These three sub-field images are displayed sequentially to visually form a single frame of image.

[0091] As shown in Figure 2 , the control circuit CU can be connected to the array substrate TB and the backlight module BLU to control the backlight module BLU's light emission and the degree of liquid crystal deflection, that is, to control the color and grayscale of each pixel. The control circuit CU may include a timing controller, a gate drive circuit, a source drive circuit, a backlight control circuit, etc., and its structure is not particularly limited here.

[0092] The inventors discovered that when using field sequential display, since a frame of image needs to be mixed from multiple sub-field images displayed at different times, when the user blinks, glances, or moves the target in the picture, they may observe red, green, and blue tones in the picture at the same time, which is a color breakup phenomenon.

[0093] To solve the problem of color separation, the inventors have discovered multiple conditions related to color separation. Based on these conditions, pixels with color separation can be identified as target pixels, and the grayscale of the target pixel is set to the average of the grayscales of the target pixel and its neighboring pixels. This reduces or eliminates color separation by reducing contrast in a targeted manner. An exemplary explanation is provided below:

[0094] First, the basic principles of the implementation of the present disclosure are explained:

[0095] As shown in Figures 2 to 6, the control circuit CU may include a first operating mode, and in the first operating mode is configured to: when receiving display data of the m-th frame image, control the liquid crystal display device to display n sub-field images in sequence to obtain the m-th frame image; the display data includes the initial grayscale of each pixel under n primary colors; the hue of a sub-field image is a primary color, and the hues of different sub-field images are different; m and n are positive integers, and n≥2.

[0096] The display data may be the initial data received by the control circuit CU for image display. For example, in electronic devices such as televisions or mobile phones, the control circuit CU may be connected to the electronic device's motherboard, and the display data may be the data output by the motherboard to the control circuit CU. Furthermore, the display data may include the information required to display the mth frame of the image, which may include the initial grayscale of each pixel in n different primary colors, meaning that each pixel has n initial grayscales. The initial grayscales of each pixel in the same primary color may be transmitted via the same channel, while the initial grayscales of different primary colors may be transmitted via different channels. In other words, for any pixel in the mth frame of the image, it may include grayscale information from multiple channels, namely, the initial grayscales for each primary color.

[0097] For example, n can be 3, and the primary colors can include red, green, and blue. The display data of the m-th frame image includes the initial grayscale of each pixel in red, green, and blue, respectively. The initial grayscale can be any grayscale between 0 and 255. The m-th frame image can be formed by mixing the red subfield image, the green subfield image, and the blue subfield image displayed in sequence.

[0098] It should be noted that the larger the grayscale of a pixel in a primary color, the higher the transmittance of the liquid crystal, the more light passes through, the higher the brightness of the pixel in that primary color, and the higher the proportion of the primary color for that pixel. On the other hand, the smaller the grayscale, the darker the brightness of the pixel in that primary color, and the lower the proportion of the primary color for that pixel.

[0099] Next, the solution to reduce color separation is described:

[0100] Under any sub-field image of the m-th frame image:

[0101] As shown in Figures 8-10, in a liquid crystal display device, based on the initial grayscale of each pixel under each primary color, pixels that meet at least one of the first and second conditions can be selected as target pixels Pt. At the same time, pixels other than a target pixel Pt can be designated as non-target pixels, and pixels adjacent to the target pixel Pt among the non-target pixels can be designated as neighboring pixels Pn of the target pixel. Furthermore, non-target pixels located outside the neighboring pixel Pn are designated as non-neighboring pixels Pm. In other words, if color separation exists, pixels can be divided into two categories: target pixels Pt and non-target pixels, and non-target pixels can be divided into two categories: neighboring pixels Pn and non-neighboring pixels Pm. Alternatively, pixels can be divided into three categories: target pixels Pt, neighboring pixels Pn, and non-neighboring pixels Pm. Of course, if color separation does not exist, meaning that all pixels meet neither the first nor the second condition, then the pixels are not classified as target pixels Pt, neighboring pixels Pn, or non-neighboring pixels Pm.

[0102] In some embodiments of the present disclosure, each pixel may be arranged in a plurality of rows and columns along a first direction X and a second direction Y, and any pixel may be arranged adjacent to eight other pixels, wherein two pixels are adjacent to the central pixel in the first direction X, and two pixels are adjacent to the central pixel in the second direction Y.

[0103] Of course, pixels may be arranged in other ways, but any pixel has other pixels adjacent to it.

[0104] The first and second conditions are explained in detail below:

[0105] The first condition mentioned above is that in a target color gamut in the reference color space, the distance between the target point reflecting the target pixel color and the white point is less than a distance threshold.

[0106] According to the initial grayscale of each pixel in the mth frame, the color of each pixel can be determined, and the color of any pixel in the mth frame image can be represented by a point in a target color gamut under the reference color space. The target color gamut can be the BT.2020 color gamut. Of course, other color gamuts such as BT.709 and DCI-P3 can also be used, and there is no special limitation here. There is also a white point in the target color gamut, and there is a certain distance between the point reflecting the non-white pixel and the white point. The boundary of the target color gamut includes points representing each primary color. For example: the distance between point P in the target color gamut and the white point W can satisfy the following formula:

[0107] dis is the distance between point P and the white point W; (Px, Py) is the coordinate of point P in the reference color space; (Wx, Wy) is the coordinate of point W in the reference color space.

[0108] A distance threshold can be set. For any pixel, if the distance between the point reflecting the pixel color and the white point is less than the distance threshold, it means that the distance between the point and the white point is relatively close, and the color of the point is formed by mixing the primary colors. The closer to the white point, the closer the proportions of the primary colors, the more difficult it is to distinguish (visually), and the more likely color separation will occur; therefore, the pixel corresponding to the point can be used as the target pixel.

[0109] The display data contains the initial grayscale of each pixel in each primary color. For any pixel in the mth frame image, its initial grayscale is normalized and gamma transformed to obtain the stimulus value of the pixel. For example, the initial grayscale of a pixel in the three primary colors is (R, G, B). The three stimulus values ​​after normalization and gamma transformation are: ((R / 255) gamma , (G / 255) gamma , (B / 255) gamma ), 255 is the maximum grayscale of the pixel. Of course, 255 can also be replaced by other values, depending on the specific performance of the liquid crystal display device; gamma can be 2.2, or 1, 3.3, etc.

[0110] The color coordinates of the color displayed by each pixel can be determined based on the tristimulus values. For example, the display data of the mth frame image can first be converted from the original color space to the reference color space through a conversion mapping. Specifically, the tristimulus values ​​in the original color space, determined based on the initial grayscale of any pixel in the display data, are converted into tristimulus values ​​in the reference color space, i.e., the reference tristimulus values. The original color space can be an RGB color space, and the reference color space can be an XYZ color space. Within the reference color space, the tristimulus values ​​of the color to be displayed by the pixel based on each primary color, i.e., the target tristimulus values, are determined. Then, based on the inverse mapping of the actual mapping corresponding to the actual color gamut of the liquid crystal display device, the original color space is converted back to the original color space. The grayscale of each pixel under each primary color is determined based on the target tristimulus values, and the pixels of the liquid crystal display panel PNL are controlled based on the grayscale to display multiple sub-field images. The detailed process is described in the description of the relevant steps of the image display method below.

[0111] In the above description, the display data is converted from the original color space to the reference color space using a conversion mapping, and then converted back to the original color space using the inverse mapping of the actual mapping. This is mainly because in the RGB color space, color coordinates and tristimulus values ​​may be negative. Directly using negative numbers for calculations can lead to errors, affecting the calculation of color coordinates and tristimulus values. Therefore, it is converted to the XYZ color space to obtain reference tristimulus values. The reference tristimulus values ​​are all positive numbers, which facilitates calculation. However, when an LCD device is actually displaying, it requires grayscale in the RGB color space. Therefore, the reference tristimulus values ​​can be mapped back to the RGB color space for display by the LCD device.

[0112] The actual mapping mentioned above can be a matrix pre-determined based on the actual color gamut of the LCD device, which can convert the tristimulus values ​​of any point in the actual color gamut from the original color space to the reference color space. The inverse mapping of this actual mapping can convert the tristimulus values ​​of any point in the actual color gamut from the reference color space to the original color space. The actual color gamut can be determined in advance by image detection or other methods before the LCD device leaves the factory. The actual color gamut of different LCD devices may vary, and accordingly, the actual mapping may also vary.

[0113] Based on the above description, in some embodiments of the present disclosure, for any liquid crystal display device, multiple reference points can be determined within the boundary of the target color gamut. The reference points are points other than points reflecting primary colors. Each reference point has a certain distance from the white point. The above distance threshold satisfies the following relationship:

[0114] 1.4Dmax≥distance threshold≥Dmax;

[0115] Dmax is the maximum distance between each reference point and the white point.

[0116] Furthermore, 1.3Dmax ≥ distance threshold ≥ Dmax. Of course, the distance threshold can also be directly 1.4Dmax, 1.3Dmax, or Dmax. The number of reference points can be three, and the three reference points represent magenta, yellow, and cyan, respectively, in the target color gamut within the reference color space; magenta is a mixture of red and blue, yellow is a mixture of red and green, and cyan is a mixture of blue and green. Because the actual color gamuts of different liquid crystal display devices may vary, the same reference point representing the same color may have different distances from the white point for different liquid crystal display devices. Therefore, the reference point with the largest distance from the white point can be selected, and its distance from the white point is used as Dmax.

[0117] The above-mentioned second condition may include two sub-conditions, namely, a first sub-condition and a second sub-condition. As long as at least one of the two sub-conditions is met, the second condition is deemed to be met, wherein:

[0118] The first sub-condition is that a reference brightness of the target pixel determined based on the initial grayscales of the target pixel under n primary colors is greater than a brightness threshold.

[0119] A target pixel has an initial grayscale under each primary color, that is, a target pixel has n initial grayscales. In order to facilitate comparison, a reference brightness can be calculated based on each initial grayscale. The larger the reference brightness, the easier it is to observe color separation. Based on optical detection and other methods and empirical data, a brightness threshold can be set. When the reference brightness is greater than the brightness threshold, it can be determined that the first sub-condition is met and color separation occurs.

[0120] In some embodiments, the brightness threshold may satisfy: 60≥brightness threshold≥20.

[0121] In some embodiments of the present disclosure, n=3, that is, the number of primary colors is three, and the three primary colors are red, green, and blue. The target pixel can be grayscaled to obtain a reference brightness, and the reference brightness and its initial grayscale satisfy the following relationship: gray=k1×R+k2×G+k3×B; k1<k3<k2;

[0122] Gray is the reference brightness of the target pixel, R is the initial grayscale of the target pixel under red, that is, the initial grayscale under the red channel; G is the initial grayscale of the target pixel under green, that is, the initial grayscale under the green channel; B is the initial grayscale of the target pixel under blue, that is, the initial grayscale under the blue channel; k1, k3, and k2 are constants.

[0123] Because the human eye's perception of red, green, and blue varies, but rather follows the order: green > red > blue, the weights of red, green, and blue in the reference brightness can be expressed as k1 < k3 < k2. The weights correspond to the degree of perception, with green, the most perceived color, receiving the highest weight, thus matching the human eye's perception. Furthermore, in some embodiments, through optical detection or other methods, k1 can be 0.114; k2 can be 0.587; and k3 can be 0.2989.

[0124] In some other embodiments of the present disclosure, the reference brightness may also be the average value of three initial grayscales, that is, the reference brightness may satisfy the following relationship: gray=(R+G+B) / 3;

[0125] Gray is the reference brightness of the target pixel, R is the initial grayscale of the target pixel under red, G is the initial grayscale of the target pixel under green, and B is the initial grayscale of the target pixel under blue.

[0126] In other embodiments of the present disclosure, grayscale can be achieved by other means to obtain a reference brightness. For example, the maximum or minimum value in the initial grayscale of the target pixel can be taken to represent the reference brightness; or the initial grayscale of one of the primary colors can be used as the reference brightness.

[0127] Any of the above-mentioned implementation methods for grayscale conversion of the target pixel, i.e., the method for calculating the reference brightness of the target pixel, can be applied to any pixel. By using any of the above-mentioned implementation methods, the reference brightness of the neighboring pixels of the target pixel can be obtained, and the reference brightness of non-neighboring pixels can also be obtained.

[0128] The second sub-condition is: the contrast of the target pixel determined based on the reference brightness of the target pixel and the reference brightness of H neighboring pixels is greater than a contrast threshold; H≥1.

[0129] Based on the reference brightness of the target pixel determined by the first sub-condition described above, and the H neighboring pixels of the target pixel, the contrast of the target pixel can be calculated, where H is greater than 1. A greater contrast indicates a greater difference between the reference brightness of the target pixel and the reference brightness of the neighboring pixels, and more pronounced color separation. Therefore, a contrast threshold can be set based on methods such as optical detection and empirical data. When the contrast exceeds the contrast threshold, the second sub-condition is determined to be met, and color separation has occurred.

[0130] When calculating the contrast of a target pixel, some or all of the neighboring pixels may be selected for calculation. For example, as shown in FIG8 , the pixels are arranged in an array along a first direction X and a second direction Y. For a target pixel, the number of neighboring pixels used for contrast calculation is H ≤ 8. When selecting neighboring pixels for contrast calculation, if two are selected, then two neighboring pixels adjacent to the target pixel in the first direction X or the second direction Y may be selected; as shown in FIG9 , if four are selected, then four neighboring pixels adjacent to the target pixel in the first direction X and the second direction Y may be selected; if six pixels are selected, then four neighboring pixels adjacent to the target pixel in the first direction X and the second direction Y and two other neighboring pixels diagonally distributed with respect to the target pixel may be selected; the method for selecting neighboring pixels is not particularly limited herein.

[0131] In some embodiments, the contrast threshold may satisfy: 900≥contrast threshold≥225.

[0132] In some embodiments of the present disclosure, as shown in Figures 9 and 10, for a target pixel, there are 8 neighboring pixels, and H is 4, that is, 4 neighboring pixels are selected to calculate the contrast; the 4 neighboring pixels are 4 neighboring pixels adjacent to the target pixel in the first direction X and the second direction Y, and are evenly distributed around the target pixel. The contrast of the target pixel satisfies the following formula:

[0133] C is the contrast of the target pixel; gray(i, j) is the reference brightness of the target pixel; gray(i, j+Δj) is a neighboring pixel adjacent to the target pixel in the first direction X; gray(i+Δi, j) is a neighboring pixel adjacent to the target pixel in the second direction Y.

[0134] In some embodiments of the present disclosure, as shown in FIG10 and FIG11 , for a target pixel, there are 8 neighboring pixels, and H is 8, that is, 8 neighboring pixels are selected to calculate the contrast. The contrast of the target pixel satisfies the following formula:

[0135] C is the contrast of the target pixel; gray(i, j) is the reference brightness of the target pixel; gray(i, j+Δj) is a neighboring pixel adjacent to the target pixel in the first direction X; gray(i+Δi, j) is a neighboring pixel adjacent to the target pixel in the second direction Y; gray(i+Δi, j+Δj) is a neighboring pixel adjacent to the target pixel in the first and second directions Y.

[0136] As shown in FIG12 , for the first condition and the first sub-condition and the second sub-condition of the second condition above, as long as at least one of them is met, it can be determined that color separation exists. For example:

[0137] In some embodiments of the present disclosure, as shown in FIG13 , it is possible to first determine whether the first condition is met and perform a coarse screening; if the first condition is met, it is then determined whether the first sub-condition is met and a first fine screening is performed; if the first sub-condition is met, it is then determined whether the second sub-condition is met and a second fine screening is performed. If the first condition, the first sub-condition, and the second sub-condition are met in sequence, it is determined that color separation exists, and the target pixel and its neighboring pixels are determined. In this embodiment, the target pixel can be screened out by three different criteria (distance, grayscale, and contrast), with high accuracy, avoiding the use of pixels that have not undergone color separation as target pixels.

[0138] Of course, in other embodiments of the present disclosure, the first condition may not be met, but the second condition may be met; or only the first condition may be met, but the second condition may not be met.

[0139] Furthermore, it is possible to determine only one of the first and second conditions, rather than both. For example, if the first condition is met, color separation is determined to exist without further determining whether the second condition is met. Alternatively, it is possible to determine whether the second condition is met directly without determining whether the first condition is met, and determine that color separation exists as long as the second condition is met. Similarly, when determining the first and second sub-conditions, it is also possible to determine only one of them.

[0140] For the two conditions above, pixels other than the target pixel that has been filtered out can be regarded as non-target pixels. Non-target pixels include neighboring pixels and non-neighboring pixels. Neighboring pixels are non-target pixels adjacent to the target pixel, and non-neighboring pixels are non-target pixels outside the neighboring pixels. The target pixel can be used as the center for filtering, that is, the actual grayscale is determined based on the initial grayscale, thereby reducing or eliminating the color separation phenomenon. The following is a detailed description:

[0141] In any subfield image, the actual grayscale of the target pixel can be the average of an intermediate grayscale determined based on its initial grayscale and the initial grayscales of T non-target pixels, and the actual grayscales of at least some of the non-target pixels are their initial grayscales; the target pixel and the T non-target pixels are located within the first filtering template, and T ≥ 1. In some embodiments, the T non-target pixels are all neighboring pixels. In other embodiments, T > 1, and the T non-target pixels include at least some neighboring pixels and some non-neighboring pixels.

[0142] The first filter template is used to represent a certain area or range. Its size can be represented by the number of pixels arranged continuously in the first direction X and the second direction Y. Specifically, the size of the first filter template can be represented by Z1×Z1 pixels, that is, Z1 continuously arranged pixels in the first direction X and Z1 continuously arranged pixels in the second direction Y. Z1 is an integer greater than 2. For example, if Z1 is 3, the first filter template is 3×3 pixels. The T pixels can be a portion or all of the pixels selected from the Z1×Z1 pixels.

[0143] Furthermore, the first filter template includes a target pixel, and the target pixel can be located at the center of the first filter template so that pixels are evenly selected around the target pixel. The neighboring pixels of the T pixels can be evenly distributed around the target pixel. Z1 can be an odd number, such as 3, 5, etc., to ensure that the target pixel is located at the center.

[0144] In some embodiments of the present disclosure, the intermediate grayscale is the average of the initial grayscale of the target pixel and the initial grayscales of U non-target pixels, where U ≥ 1. The target pixel and the U non-target pixels are located within the second filtering template. In some embodiments, the U non-target pixels are all neighborhood pixels. In other embodiments, U > 1, and the U non-target pixels include at least some neighborhood pixels and some non-neighborhood pixels. U may be equal to T or may not be equal to T.

[0145] The meaning of the second filter template may be the same as that of the first filter template, and it is also used to represent a certain area and range. Its size can also be expressed by Z1×Z1 pixels, but the size of the second filter template is not necessarily the same as the first filter template, and it may be less than or equal to the first filter template. For example, the second filter template is 3×3 pixels, and the first filter template is also 3×3 pixels; or, the second filter template is 5×5 pixels, and the first filter template is also 3×3 pixels; or, the second filter template is 3×3 pixels, and the first filter template is also 5×5 pixels.

[0146] That is, the second filtering template can be used to filter out the target pixel and multiple non-target pixels, and the average of the initial grayscales of the target pixel and U non-target pixels is calculated to obtain the intermediate grayscale, i.e., the first round of filtering is performed on the target pixel. Then, the first filtering template is used to filter out the target pixel and multiple non-target pixels, and the average of the intermediate grayscale and the initial grayscales of T non-target pixels is calculated to obtain the actual grayscale of the target pixel, i.e., the second round of filtering is performed.

[0147] In some embodiments of the present disclosure, the intermediate grayscale is the initial grayscale of the target pixel, and the actual grayscale of the target pixel is the average of its initial grayscale and the initial grayscales of T non-target pixels. In this embodiment, the target pixel and multiple non-target pixels can be screened out using only the first filtering template, and the average of the intermediate grayscale and the initial grayscales of the T non-target pixels can be calculated to obtain the actual grayscale of the target pixel, thereby calculating the average value only once instead of twice.

[0148] Based on the above embodiments, when the LCD device displays any subfield image, which is a monochromatic image, the grayscale used for a target pixel is not its initial grayscale, but an average grayscale. This reduces the contrast of the target pixel relative to its surrounding pixels, thereby reducing or eliminating color separation.

[0149] Since each pixel has an initial grayscale under each primary color, if there are three primary colors, each pixel has three initial grayscales. When calculating the actual grayscale, the calculation can be performed separately for each primary color to obtain the actual grayscale of the target pixel under each primary color. For example, for a target pixel, its actual grayscale under the red primary color is the average of its middle grayscale under red and the initial grayscales of T non-target pixels; its actual grayscale under the green primary color is the average of its middle grayscale under green and the initial grayscales of T neighboring pixels; and its actual grayscale under the blue primary color is the average of its middle grayscale under blue and the initial grayscales of T pixels.

[0150] In some embodiments, as shown in Figures 9 and 10, the target pixel has 8 neighboring pixels, and T can be 4, 8, etc., but T pixels may not all be neighboring pixels; for example, if the size of the first filter template is 5×5 pixels, then T may include some neighboring pixels and some non-neighboring pixels, which is not specifically limited here. In order to ensure uniformity, the T non-target pixels can be evenly distributed around the target pixel. For example, for a target pixel, there are 8 neighboring pixels, T is 4, that is, 4 neighboring pixels are selected to calculate the average value; the 4 neighboring pixels are 4 neighboring pixels adjacent to the target pixel in the first direction X and the second direction Y; or, T is 8, and all 8 neighboring pixels are used to calculate the average value.

[0151] When calculating the actual grayscale of the target pixel under any primary color, the following formula can be used:

[0152] mean(i, j) is the actual grayscale; Z1 is the number of pixels in the first direction X and the second direction Y of the first filter template centered on the target pixel; input(i+s, j+k) is the initial grayscale of the pixel used to calculate the actual grayscale of the target pixel.

[0153] The above formula can be used to calculate the actual grayscale of the target pixel under different primary colors.

[0154] In some embodiments of the present disclosure, filtering operations can be performed on non-target pixels surrounding a target pixel, thereby further reducing contrast, improving color separation, and enhancing image smoothness. The distance between the non-target pixels targeted by the filtering operation and the target pixel can be within a certain range, for example, a maximum of 2-3 pixels apart; thus, the non-target pixels targeted by the filtering operation can be neighboring pixels of the target pixel or non-neighboring pixels within a certain range.

[0155] As shown in FIG8-FIG10 , in some embodiments of the present disclosure, in any subfield image of the m-th frame image:

[0156] There is at least one non-target pixel whose actual grayscale is the average of the initial grayscales of W non-target pixels including the non-target pixel and the actual grayscale of the target pixel; the W non-target pixels and the target pixel are located in the third filtering template, and W≥2.

[0157] In one embodiment, the non-target pixels targeted by the filtering operation may be neighboring pixels, and the filtering operation may be performed simultaneously on some or all of the neighboring pixels, subject to the specific size limit of W. The size of the third filter template for each neighboring pixel performing the filtering operation is the same, for example, 3×3 pixels. Of course, in other embodiments, the filtering operation may also be performed on non-neighboring pixels independently.

[0158] The meaning of the third filter template can be the same as that of the first filter template and the second filter template, and its size can also be expressed by Z1×Z1 pixels. At the same time, the third filter template can be the same size as the first filter template, for example, both are 3×3 or 5×5 pixels. This allows the filtering operation on non-target pixels and the filtering operation on target pixels based on the first filter template to be performed simultaneously, and performed with filter templates of equal size, so that when filtering non-target pixels, there is no need to identify and exclude target pixels for filtering operations, which is beneficial to improving operating efficiency. At the same time, while performing the first filtering operation on the non-target pixels, the filtering operation is performed on the target pixels for the second time. The two belong to the second round of filtering operations, which can further reduce the contrast between the target pixels and the surrounding areas and reduce the color separation phenomenon. Based on the above scheme, the number of times the filtering operation is performed on the target pixels is one more than the number of times the filtering operation is performed on the non-target pixels.

[0159] Furthermore, in a subfield image of the mth frame image, the above filtering operation can be performed on more non-target pixels, that is, a third or more rounds of filtering operations can be carried out. The specific method is to calculate the average grayscale of the pixels within the filtering template with a non-neighborhood pixel as the center; if the filtering template can include the target pixel and the non-target pixels targeted by the second round of filtering operations, the grayscale used when calculating the average value is the actual grayscale of the target pixel and the non-target pixels targeted by the second round of filtering operations; the grayscale of the non-target pixels that have not been filtered uses the initial grayscale. In this way, the image outside the target pixel can be further smoothed, the contrast can be reduced, and color separation can be improved. Of course, the filtering template can also exclude any of the target pixel and the non-target pixels targeted by the second round of filtering operations.

[0160] In one embodiment, each round of filtering operation includes filtering pixels that have been previously filtered, avoiding the need to specifically exclude pixels that have been previously filtered.

[0161] Furthermore, the third filter template may include a target pixel, but the target pixel is not located at the center of the third filter template, but is centered around a non-target pixel so that pixels are uniformly selected around the neighborhood pixel. The pixels and the target pixel other than the non-target pixel at the center of the W pixels may be uniformly distributed around the non-target pixel at the center. Z1 may be an odd number, such as 3, 5, etc., to ensure that a neighborhood pixel is located at the center.

[0162] As shown in FIG. 8 to FIG. 10 , in another embodiment of the present disclosure, the third filtering template may also not include the target pixel, that is, the target pixel is located outside the third filtering template.

[0163] In any subfield image of the m-th frame image:

[0164] The actual grayscale of at least one non-target pixel is the average of the initial grayscales of W non-target pixels including the non-target pixel; and the W non-target pixels are located in the third filter template; W≥2; the third filter template and the second filter template have the same size.

[0165] In this embodiment, the non-target pixels for which filtering is performed may be non-neighborhood pixels, and when filtering is performed on the non-target pixels, i.e., when calculating the average value, the initial grayscale and actual grayscale of the target pixel may not be included in the calculation. The formula for calculating the average grayscale value can refer to the formula for calculating the actual grayscale of the target pixel under any primary color described above and will not be described in detail here.

[0166] Furthermore, in some embodiments of the present disclosure, the control circuit CU further includes a second operating mode, and in the second operating mode is configured to: upon receiving display data of an m-th frame image, control the liquid crystal display device to sequentially display n subfield images to obtain the m-th frame image; m and n are positive integers, and n is greater than or equal to 2. The actual grayscale of each pixel is its initial grayscale.

[0167] In the second working mode, display is performed directly according to the display data without re-screening the target pixels according to the first condition and the second condition, and without calculating the actual grayscale according to the initial grayscale.

[0168] The first and second operating modes described above can be activated upon receiving an activation signal. For example, an image capture device can capture an image of the user's eyeball, and an image processing device can determine the eyeball's movement speed based on the eyeball image. When the movement speed reaches a speed threshold, color separation becomes more pronounced. In this case, the control circuit CU can be placed in the first operating mode to eliminate color separation. When the movement speed does not reach the speed threshold, the color separation may be less pronounced. In this case, the control circuit CU can be placed in the second operating mode to improve operational efficiency.

[0169] An embodiment of the present disclosure provides an electronic device, which may include a liquid crystal display device. The structure of the liquid crystal display device may be the liquid crystal display device of any embodiment described above, which will not be described in detail here.

[0170] As shown in FIG7 , the electronic device further includes an image acquisition device and an image processing device, wherein:

[0171] The image acquisition device CAM may include one or more cameras, and of course, other devices that can acquire image information such as human body or object feature information may also be used. The image acquisition device CAM can acquire images of the user's eyeballs in real time.

[0172] The image processing device CP can be connected to the image acquisition device CAM. It can determine the movement speed of the eyeball based on the image of the eyeball. When the movement speed reaches a speed threshold, it outputs a start signal to the control circuit CU, placing the control circuit CU in the first operating mode. If the movement speed does not reach the speed threshold, no start signal is output, and the control circuit CU is placed in the second operating mode.

[0173] The image processing device CP can identify the pupil center based on the image of the eyeball and determine the movement speed of the eyeball based on the change in the position of the pupil center.

[0174] In some embodiments, the electronic device may further include an infrared detection device that uses infrared light to locate the center of the user's cornea. The line connecting the corneal center and the pupil center identified by the image processing device is the optical axis of the visual system. The true line of sight can then be determined based on the angle between the optical axis and the visual axis. Furthermore, a thermal mirror may be included to reduce tracking errors without affecting the display; alternatively, an optical waveguide may be used to transmit infrared light and eye images.

[0175] In addition, eye tracking may also be achieved through other methods, which are not particularly limited here.

[0176] The electronic device disclosed herein may be a mobile phone, a television, a tablet computer, or a head-mounted display device such as smart glasses, which are not listed here one by one.

[0177] For the liquid crystal display device and electronic device disclosed herein, the following methods can be used to determine whether the relevant products fall within the scope of protection of this disclosure and thus constitute infringement:

[0178] 1. Determine whether the relevant product includes a liquid crystal display panel and a control circuit. A liquid crystal display panel has multiple luminous pixels. As long as there are multiple luminous units that use liquid crystals to achieve display and circuits to control these units, the product is considered to include a liquid crystal display panel and a control circuit.

[0179] 2. In the power-on state, determine whether the control circuit receives a signal from the outside world and transmits it to the pixel. If so, determine whether a frame of image includes multiple sequentially displayed monochromatic images, i.e., sub-field images. This is field sequential display, which shares the same basic principle as the display implementation of the present disclosure. There is no limit on the number of sub-field images in a frame of image.

[0180] 3. In the power-on state, in any subfield image, in areas with low contrast, image detection combined with acquisition of pixel voltage and other signals can be used to determine whether a pixel has a grayscale that is the average of the grayscales of the pixel and its adjacent pixels. If so, the initial grayscale of the pixel can be determined based on the detected pixel voltage and other data to determine whether it meets at least one of the first and second conditions. If so, the pixel falls within the scope of protection of this disclosure.

[0181] In addition, the inventors conducted tests on the liquid crystal display device disclosed in the present invention, and the present invention also provides the test results. As shown in Figures 14 and 15, each pixel displays the image directly according to the initial grayscale, that is, the actual grayscale is the initial grayscale, and the image is a white strip (the initial grayscales of R, G, and B are (255, 255, 255) respectively).

[0182] As shown in FIG14 , with the solution disclosed in the present invention, the actual grayscale of the edge of the white bar will be less than 255, which is actually manifested as blurred edges and reduced brightness, as shown in FIG15 . When the brightness threshold is set to 50, the contrast threshold is set to 625, H and T are both equal to 8; and after filtering the target pixel and the neighboring pixels, the target pixel is filtered twice. The actual grayscale of the pixels on the left edge of the white bar increases in the direction close to the central axis of the white bar, namely (0, 0, 0), (28, 28, 28), (57, 57, 57), (85, 85, 85), (113, 113, 113), (142, 142, 142), (170, 170, 170), (198, 198, 198), (227, 227, 227), (255, 255, 255), and the right edge is mirror-symmetrical with it, which will not be described in detail here and is not shown in the figure.

[0183] The embodiments of the present disclosure provide an image display method that can be used in a liquid crystal display device. The structure of the liquid crystal display device can refer to the liquid crystal display device of any embodiment above and will not be described in detail here. As shown in Figure 12, the image display method of the present disclosure includes:

[0184] In the first working mode, steps S110 to S130 are performed, wherein:

[0185] Step S110, receiving display data of the m-th frame image, the display data including initial grayscales of the pixels under n primary colors; the hue of a subfield image is the primary color, and different subfield images have different hues; m and n are positive integers, and n ≥ 2;

[0186] Step S120: Under each of the primary colors, a pixel that satisfies at least one of a first condition and a second condition is defined as a target pixel, and pixels other than the target pixel are defined as non-neighborhood pixels; a plurality of pixels adjacent to the target pixel among the non-neighborhood pixels are defined as neighborhood pixels, and pixels outside the neighborhood pixels among the non-neighborhood pixels are defined as non-neighborhood pixels; the first condition is that, in a target color gamut under a reference color space, a distance between a target point reflecting the color of the pixel and a white point is less than a distance threshold; the second condition is that a reference brightness of the pixel is greater than a brightness threshold; and / or a contrast of the pixel determined based on the reference brightness of the pixel and the reference brightness of H adjacent pixels is greater than a contrast threshold; H ≥ 1;

[0187] Step S130: Perform a display step under each primary color to obtain the mth frame image; the display step includes:

[0188] The average value of the intermediate grayscale determined based on the initial grayscale of the target pixel and the initial grayscales of T non-target pixels in the first filtering template is used as the actual grayscale of the target pixel; and the initial grayscales of at least some of the non-target pixels are used as their actual grayscales to display a subfield image of the mth frame image; the hue of the subfield image is the primary color, and different subfield images have different hues; T≥1.

[0189] The following is a detailed description of each step with examples:

[0190] In step S110, the display data may be the initial data received by the control circuit CU for image display. For example, in electronic devices such as televisions or mobile phones, the control circuit CU may be connected to the electronic device's motherboard, and the display data may be data output by the motherboard to the control circuit CU. The display data may also include information required to display the mth frame of the image, including the initial grayscale of each pixel in n different primary colors, meaning each pixel has n initial grayscales. The initial grayscales of each pixel in the same primary color may be transmitted via the same channel, while the initial grayscales of different primary colors may be transmitted via different channels.

[0191] For example, n can be 3, and the primary colors can include red, green, and blue. The display data of the m-th frame image includes the initial grayscale of each pixel in red, green, and blue, respectively. The initial grayscale can be any grayscale between 0 and 255. The m-th frame image can be formed by mixing the red subfield image, the green subfield image, and the blue subfield image displayed in sequence.

[0192] It should be noted that the larger the grayscale of a pixel in a primary color, the higher the transmittance of the liquid crystal, the more light passes through, the higher the brightness of the pixel in that primary color, and the higher the proportion of the primary color for that pixel. On the other hand, the smaller the grayscale, the darker the brightness of the pixel in that primary color, and the lower the proportion of the primary color for that pixel.

[0193] In step S120, for each primary color, it is determined whether there is a pixel that satisfies at least one of the first condition and the second condition. If so, the pixel that satisfies at least one of the first condition and the second condition is used as the target pixel. At the same time, multiple pixels adjacent to the target pixel can be defined as neighboring pixels, and pixels outside the neighboring pixels can be defined as non-neighboring pixels.

[0194] The specific contents of the first condition and the second condition have been described in the above embodiments of the liquid crystal display device and will not be repeated here.

[0195] When determining whether the first condition is met, it can be implemented through steps S1210 and S1230, wherein:

[0196] In step S1210 , the color coordinates of the mixed color of each pixel in a target color gamut in a reference color space are determined according to the initial grayscale of each pixel.

[0197] The target color gamut can be the BT.2020 color gamut. Of course, other color gamuts such as BT.709 and DCI-P3 can also be used, and there is no special limitation here. There is also a white point in the target color gamut. The points reflecting non-white pixels are a certain distance away from the white point. The boundary of the target color gamut includes points representing each primary color. Each pixel can be represented by a point in the target color gamut, and pixels of different colors are represented by different points. At the same time, there is also a white point in the target color gamut.

[0198] Step S1220 , respectively calculating the distance between each point representing the pixel and the white point.

[0199] The distance between point P representing the color of a pixel in the target color gamut and the white point W can satisfy the following formula:

[0200] dis is the distance between point P and the white point W; (Px, Py) is the coordinate of point P in the reference color space; (Wx, Wy) is the coordinate of point W in the reference color space.

[0201] In step S1230 , the distance between each point representing the color of the pixel and the white point is compared with a distance threshold. If the distance is less than the distance threshold, it is determined that the first condition is satisfied.

[0202] The distance threshold has been explained above and will not be repeated here.

[0203] When determining whether the second condition is satisfied, it is possible to determine whether the first sub-condition and the second sub-condition are satisfied respectively, wherein:

[0204] When determining whether the first sub-condition is satisfied, a reference brightness of the target pixel may be calculated and compared with a brightness threshold. If the reference brightness is greater than the brightness threshold, the first sub-condition is determined to be satisfied. The calculation method for the reference brightness has been described above and will not be repeated here.

[0205] When determining whether the second sub-condition is met, it can be implemented through steps S1240 and S1250, where:

[0206] Step S1240 : Under any primary color, determine the contrast of the target pixel according to the reference brightness of the target pixel and the reference brightness of H neighboring pixels; H≥1.

[0207] The calculation of contrast ratio can refer to the description of contrast ratio in the above embodiment of the liquid crystal display device, and will not be described in detail here.

[0208] In some embodiments of the present disclosure, for a target pixel, there are 8 neighboring pixels, and H is 4, that is, 4 neighboring pixels are selected to calculate the contrast; the 4 neighboring pixels are 4 neighboring pixels adjacent to the target pixel in the first direction X and the second direction Y, and are evenly distributed around the target pixel. The contrast of the target pixel satisfies the following formula:

[0209] C is the contrast of the target pixel; gray(i, j) is the reference brightness of the target pixel; gray(i, j+Δj) is a neighboring pixel adjacent to the target pixel in the first direction X; gray(i+Δi, j) is a neighboring pixel adjacent to the target pixel in the second direction Y.

[0210] Step S1250 : comparing the contrast of the target pixel with the contrast threshold, and when the contrast is less than the contrast threshold, determining that the second sub-condition is satisfied.

[0211] In some embodiments of the present disclosure, the contrast threshold may satisfy: 900≥contrast threshold≥225.

[0212] In some embodiments of the present disclosure, step S130 may include step S1310 and step S1320, wherein:

[0213] Step S1310: taking the average of the initial grayscale of the target pixel and the initial grayscales of U non-target pixels as the intermediate grayscale; the target pixel and U non-target pixels are located in the second filtering template; U≥1;

[0214] Step S1320 : Taking an average value of the intermediate grayscale and the initial grayscales of the T non-target pixels in the first filtering template as the actual grayscale of the target pixel.

[0215] In other embodiments of the present disclosure, the intermediate grayscale is the initial grayscale of the target pixel, and the filtering operation is performed on the target pixel only once. When the filtering operation is performed on the non-target pixel, the filtering operation is no longer performed on the target pixel.

[0216] In any subfield image, the actual grayscale of a target pixel can be set to the average of an intermediate grayscale determined based on its initial grayscale and the initial grayscales of T non-target pixels. This means that a filtering operation is performed on the target pixel, and the actual grayscale of at least some non-target pixels is the initial grayscale; T ≥ 1. Specifically, when the liquid crystal display device displays any subfield image, which is a monochromatic image, the grayscale used for a target pixel is not its initial grayscale, but an average value, which is the average of the intermediate grayscale of the target pixel and the initial grayscales of T non-target pixels. This method reduces the contrast of the target pixel relative to neighboring pixels, thereby weakening or eliminating color separation.

[0217] Since each pixel has an initial grayscale under each primary color, if there are three primary colors, each pixel has three initial grayscales. When calculating the actual grayscale, the calculation can be performed separately for each primary color to obtain the actual grayscale of the target pixel under each primary color. For example, for a target pixel, its actual grayscale under the red primary color is the average of its middle grayscale under red and the initial grayscales of T non-target pixels; its actual grayscale under the green primary color is the average of its middle grayscale under green and the initial grayscales of T neighboring pixels; and its actual grayscale under the blue primary color is the average of its middle grayscale under blue and the initial grayscales of T pixels.

[0218] When calculating the actual grayscale of the target pixel under any primary color, the following formula can be used:

[0219] mean(i, j) is the actual grayscale; Z1 is the number of pixels in the first direction X and the second direction Y of the first filter template centered on the target pixel; input(i+s, j+k) is the initial grayscale of the pixel used to calculate the actual grayscale of the target pixel.

[0220] The above formula can be used to calculate the actual grayscale of the target pixel under different primary colors.

[0221] In some embodiments of the present disclosure, a filtering operation may be performed again, centering on non-target pixels surrounding the target pixel, thereby further reducing contrast, improving color separation, and enhancing image smoothness. For details, reference may be made to the filtering operation described above in the embodiments of the liquid crystal display device, which will not be described in detail here.

[0222] In addition, non-target pixels may be selected in sequence along a direction away from the target pixel to perform the above filtering operation. The specific method has been described in detail above and will not be described in detail here.

[0223] As shown in FIG12 , for the liquid crystal display device of the present disclosure, if there is no pixel that satisfies at least one of the first condition and the second condition, the original step S140 may be executed, that is, the initial grayscale of each pixel is used as its actual grayscale for display.

[0224] In summary of the above steps, in some embodiments of the present disclosure, the image generation method may include steps S210 to S260, wherein: in step 210, display data may be received; in step S220, it may be determined whether the first condition is satisfied, and when the first condition is satisfied, step S230 is executed, i.e., whether the first sub-condition is satisfied, and when the first sub-condition is satisfied, step S240 is executed, i.e., whether the second sub-condition is satisfied, and when the second sub-condition is satisfied, the display step is executed to perform a filtering operation; if any of the first condition, the first sub-condition, and the second sub-condition is not satisfied, the original step S260 is executed and the image is displayed according to the initial grayscale. The details of the above steps have been described in detail above and will not be repeated here.

[0225] In addition, in some embodiments of the present disclosure, the image display method of the present disclosure may further include:

[0226] In the second working mode:

[0227] receiving display data of an m-th frame of image, where the display data includes n different reference primary colors;

[0228] n subfield images are displayed in sequence according to the target primary color to obtain the mth frame image; the hue of a subfield image is a reference primary color, and different subfield images have different hues; m and n are positive integers, and n is greater than or equal to 2.

[0229] The display data includes n different reference primary colors. The hue of a subfield image is a reference primary color, and the hues of different subfield images are different.

[0230] In the second operating mode, the actual grayscale of the pixel is its initial grayscale.

[0231] The first and second operating modes described above can be activated upon receiving an activation signal. For example, an image capture device can capture an image of the user's eyeball, and an image processing device can determine the eyeball's movement speed based on the eyeball image. When the movement speed reaches a speed threshold, color separation may be more obvious. In this case, the control circuit can be placed in the first operating mode to eliminate color separation. When the movement speed does not reach the speed threshold, color separation may be less obvious. In this case, the control circuit can be placed in the second operating mode to improve operating efficiency.

[0232] It should be noted that although the steps of the image display method of the present disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in this specific order, or that all steps must be performed to achieve the desired results. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or a single step may be broken down into multiple steps.

[0233] The embodiment of the present disclosure further provides a computer-readable storage medium having a computer program stored thereon, and the image display method is implemented when the computer program is executed by a processor.

[0234] Through the description of the above embodiments, it is easy for those skilled in the art to understand that the example embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure can be embodied in the form of a program product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, and includes a number of instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the image generation method according to the embodiments of the present disclosure.

[0235] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A liquid crystal display device, comprising a liquid crystal display panel and a control circuit, wherein the liquid crystal display panel comprises a plurality of pixels; The control circuit includes a first working mode, and in the first working mode, is configured to: upon receiving display data of an m-th frame image, control the liquid crystal display device to sequentially display n subfield images to obtain the m-th frame image; the display data includes an initial gray scale of each of the pixels under n primary colors; The hue of the subfield image is the primary color, and different subfield images have different hues; m and n are positive integers, and n≥2; In any of the subfield images of the m-th frame image: the pixels include target pixels and non-target pixels, the non-target pixels include a plurality of neighboring pixels adjacent to the target pixel and non-neighboring pixels outside the neighboring pixels; the actual grayscale of the target pixel is an average value of an intermediate grayscale determined based on its initial grayscale and the initial grayscales of T non-target pixels; the target pixel and the T non-target pixels are located within a first filtering template; the actual grayscales of at least some of the non-target pixels are their initial grayscales; T≥1； The target pixel satisfies at least one of a first condition and a second condition; The first condition is that: in a target color domain under a reference color space, the distance between a target point reflecting the color of the target pixel and a white point is less than a distance threshold; The second condition is that a reference brightness of the target pixel determined based on the initial grayscales of the target pixel under the n primary colors is greater than a brightness threshold; And / or, the contrast of the target pixel determined based on the reference brightness of the target pixel and the reference brightness of H neighboring pixels is greater than a contrast threshold; H≥1。 2. The liquid crystal display device according to claim 1, wherein: The intermediate grayscale is an average value of an initial grayscale of the target pixel and initial grayscales of U non-target pixels; the target pixel and U non-target pixels are located in a second filtering template; U≥1.

3. The liquid crystal display device according to claim 2, wherein: Under any of the subfield images of the m-th frame image: The actual grayscale of the non-target pixel is an average value of the initial grayscales of W non-target pixels including the non-target pixel and the actual grayscale of the target pixel; and the target pixel and the W non-target pixels are located in a third filtering template; W≥2; The third filtering template and the second filtering template have the same size.

4. The liquid crystal display device according to claim 2, wherein: Under any of the subfield images of the m-th frame image: The actual grayscale of at least one of the non-target pixels is an average value of the initial grayscales of W non-target pixels including the non-target pixel; and the W non-target pixels are located within the third filtering template, and the target pixel is located outside the third filtering template; W≥2； The third filtering template and the second filtering template have the same size.

5. The liquid crystal display device according to claim 3 or 4, characterized in that: The distance threshold is greater than or equal to Dmax and less than or equal to 1.4Dmax; Dmax is the maximum distance between a plurality of reference points in the edge of the target color gamut and the white point.

6. The liquid crystal display device according to claim 5, wherein: The number of the reference points is three, and the three reference points represent magenta, yellow, and cyan, respectively, in the target color gamut.

7. The liquid crystal display device according to claim 1, wherein: n=3, and the primary colors include red, green and blue; the reference brightness of the target pixel and its initial grayscale satisfy the following relationship: gray=k1×R+k2×G+k3×B; k1<k3<k2; gray is the reference brightness of the target pixel, R is the initial grayscale of the target pixel under red, G is the initial grayscale of the target pixel under green, and B is the initial grayscale of the target pixel under blue; k1, k3 and k2 are constants.

8. The liquid crystal display device according to claim 7, wherein: k1 is 0.114; k2 is 0.587; k3 is 0.2989.

9. The liquid crystal display device according to claim 7, wherein: H is 4; the contrast of the target pixel satisfies the following formula: C is the contrast of the target pixel; gray(i, j) is the reference brightness of the target pixel; gray(i, j+Δj) is a neighboring pixel adjacent to the target pixel in the first direction; gray(i+Δi, j) is a neighboring pixel adjacent to the target pixel in the second direction; The first direction and the second direction intersect.

10. The liquid crystal display device according to claim 1, wherein: 60≥the brightness threshold≥20; 900≥the contrast threshold≥225.

11. The liquid crystal display device according to claim 1, wherein: The control circuit further includes a second working mode, and in the second working mode is configured to: if the display data of the m-th frame image is received, control the liquid crystal display device to display n sub-field images in sequence to obtain the m-th frame image; In the second working mode, the actual grayscale of the pixel is its initial grayscale.

12. The liquid crystal display device according to any one of claims 1 to 11, wherein: The liquid crystal display panel comprises: An array substrate and a counter substrate arranged opposite to each other; A liquid crystal layer, disposed between the array substrate and the counter substrate; The liquid crystal display device further comprises: A backlight module, which is disposed on a side of the array substrate away from the counter substrate and includes light-emitting devices of n different colors, wherein the backlight module emits the same light color when displaying the same subfield image and emits different light colors when displaying different subfield images; The control circuit is connected to the array substrate and the backlight module.

13. An electronic device comprising the liquid crystal display device according to any one of claims 1 to 12.

14. The electronic device according to claim 13, wherein: The electronic device further comprises: An image acquisition device, used to acquire an image of the user's eyeball; The image processing device is used to determine the movement speed of the eyeball according to the image of the eyeball, and when the movement speed reaches a speed threshold, control the control circuit to be in the first working mode.

15. An image display method, the image display method being used in a liquid crystal display device, the liquid crystal display device comprising a liquid crystal display panel and a control circuit, the liquid crystal display panel comprising a plurality of pixels; the image display method comprising: In the first working mode: Receive display data of the m-th frame image, wherein the display data includes initial grayscales of the pixels under n primary colors; m and n are positive integers, and n ≥ 2; Under each of the primary colors, a pixel satisfying at least one of the first condition and the second condition is a target pixel, and pixels other than the target pixel are non-target pixels; The plurality of pixels adjacent to the target pixel in the target pixel are neighborhood pixels, and the pixels outside the neighborhood pixels in the non-target pixels are non-neighborhood pixels; the first condition is that: in a target color domain under a reference color space, the distance between the target point reflecting the color of the pixel and the white point is less than a distance threshold; the second condition is that: the reference brightness of the target pixel determined based on the initial grayscale of the target pixel under the n primary colors is greater than a brightness threshold; And / or, the contrast of the target pixel determined based on the reference brightness of the target pixel and the reference brightness of H neighboring pixels is greater than a contrast threshold; H≥1； Under each primary color, perform the display step to obtain the m-th frame image; The display step comprises: Taking the average value of the intermediate grayscale determined based on the initial grayscale of the target pixel and the initial grayscales of T non-target pixels in the first filtering template as the actual grayscale of the target pixel; and taking the initial grayscales of at least some of the non-target pixels as their actual grayscales to display a subfield image of the mth frame image; The hue of one of the subfield images is one of the primary colors, and different subfield images have different hues; T≥1.

16. The image display method according to claim 15, wherein: Taking the average value of the intermediate grayscale determined based on the initial grayscale of the target pixel and the initial grayscales of T non-target pixels in the first filtering template as the actual grayscale of the target pixel; include: The average value of the initial grayscale of the target pixel and the initial grayscales of the U non-target pixels is taken as the intermediate grayscale; the target pixel and the U non-target pixels are located in the second filtering template; U≥1; An average value of the intermediate grayscale and the initial grayscales of T non-target pixels in the first filtering template is used as the actual grayscale of the target pixel.

17. The image display method according to claim 16, wherein: The display step further comprises: The average value of the initial grayscale of W non-target pixels and the actual grayscale of the target pixel is taken as the actual grayscale of one of the W non-target pixels; W≥2; and the target pixel and the W non-target pixels are located in a third filter template; the third filter template and the second filter template have the same size.

18. The image display method according to claim 16, wherein: The display step further comprises: The average value of the initial grayscales of the W non-target pixels is used as the actual grayscale of one of the W non-target pixels; W≥2; and the W non-target pixels are located within the third filter template, and the target pixel is located outside the third filter template; the third filter template and the second filter template have the same size.

19. The image display method according to claim 16 or 17, wherein: The distance threshold is greater than or equal to Dmax and less than or equal to 1.4Dmax; Dmax is the maximum distance between a plurality of reference points at the edge of the target color gamut and the white point.

20. The image display method according to claim 19, wherein: The number of the reference points is three, and the three reference points represent magenta, yellow, and cyan, respectively, in the target color gamut.

21. The image display method according to claim 15, wherein: n=3, and the primary colors include red, green and blue; the reference brightness of the target pixel and its initial grayscale satisfy the following relationship: gray=k1×R+k2×G+k3×B; k1<k3<k2; gray is the reference brightness of the target pixel, R is the grayscale of the target pixel under red, G is the grayscale of the target pixel under green, and B is the grayscale of the target pixel under blue.

22. The image display method according to claim 21, wherein: k1 is 0.114; k2 is 0.587; k3 is 0.2989.

23. The image display method according to claim 21, wherein: H is 4; the contrast of the target pixel satisfies the following formula: gray(i, j) is the reference brightness of the target pixel; gray(i, j+Δj) is a neighboring pixel adjacent to the target pixel in the first direction; gray(i+Δi, j) is a neighboring pixel adjacent to the target pixel in the second direction; The first direction and the second direction intersect.

24. The image display method according to claim 15, wherein: 60≥the brightness threshold≥20; 900≥the contrast threshold≥225.

25. The image display method according to claim 15, wherein: In the second working mode: Receiving the display data of the m-th frame image; Under each primary color, n subfield images are displayed in sequence with the initial gray scale of the pixel as the actual gray scale to obtain the mth frame image.

26. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the image display method according to any one of claims 15 to 25.

Images