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

Abstract

A liquid crystal display device, an image display method, an electronic device and a readable storage medium. The control circuit of the device, in a first working mode: receives display data of the mth frame of image, controls the device to display n sub-field images to obtain the mth frame of image; the display data includes initial gray scales under n primary colors; in a sub-field image of the mth frame of image: the pixel includes a target pixel, the actual gray scale of the target pixel is the average value of the intermediate gray scale and the initial gray scales of T non-target pixels; the actual gray scale of at least part of the non-target pixels is the initial gray scale thereof; the target pixel at least satisfies one of a first condition and a second condition; the first condition is: the distance between a target point reflecting the color of the target pixel and a white point in a reference color space is less than a distance threshold; the second condition is: the reference luminance of the target pixel is greater than a luminance threshold; and / or, the contrast of the target pixel is greater than a contrast threshold.

Description

TECHNICAL FIELD

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

[0002] Display panel is an indispensable part of electronic devices such as televisions and mobile phones, among which liquid crystal display panel is widely used. The existing liquid crystal display panel has high light loss and high energy consumption in the light emitting process.

[0003] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those skilled in the art. SUMMARY

[0004] The present disclosure provides a display device, an image display method, an electronic device and a readable storage medium.

[0005] According to one aspect of the present disclosure, a liquid crystal display device is provided, comprising a liquid crystal display panel and a control circuit, the liquid crystal display panel comprising a plurality of pixels;

[0006] The control circuit comprises a first working mode, configured to control the liquid crystal display device to display n sub-field images in sequence to obtain the mth frame image when receiving the display data of the mth frame image; the display data comprises the initial gray scale of each pixel under n base colors; the hue of one sub-field image is one base color, and the hues of different sub-field images are different; m and n are positive integers, and n≥2;

[0007] In any sub-field image of the mth frame image: the pixels include a target pixel and non-target pixels, the non-target pixels include a plurality of neighborhood pixels adjacent to the target pixel and non-neighborhood pixels located outside the neighborhood pixels; the actual gray scale of the target pixel is an intermediate gray scale determined based on its initial gray scale and the average of the initial gray scales of T non-target pixels; the target pixel and the T non-target pixels are located within a first filter template; the actual gray scale of at least part of the non-target pixels is its initial gray scale; T≥1;

[0008] The target pixel satisfies at least one of a first condition and a second condition;

[0009] The first condition is that in a target color gamut in 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;

[0010] The second condition is that the reference brightness of the target pixel determined based on the initial gray scale of the target pixel under n base colors is greater than a brightness threshold value; 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 pixels is greater than a contrast threshold value; H≥1.

[0011] In an exemplary embodiment of the present disclosure, the intermediate gray scale is the average of the initial gray scale of the target pixel and the initial gray scales of U non-target pixels; the target pixel and U non-target pixels are located within a second filter template; U≥1.

[0012] In an exemplary embodiment of the present disclosure, under any of the subfield images of the mth frame image:

[0013] The actual gray scale of one non-target pixel is the average of the initial gray scales of W non-target pixels including the non-target pixel and the actual gray scale of the target pixel; and the target pixel and W non-target pixels are located within a third filter template; W≥2;

[0014] The third filter template and the first filter template have the same size.

[0015] In an exemplary embodiment of the present disclosure, under any of the subfield images of the mth frame image:

[0016] The actual gray scale of at least one non-target pixel is the average of the initial gray scales of W non-target pixels including the non-target pixel; and W non-target pixels are located within a third filter template, and the target pixel is located outside the third filter template; W≥2;

[0017] The third filter template and the first filter template have the same size.

[0018] In an exemplary embodiment of the present disclosure, the distance threshold value is greater than or equal to Dmax, and less than or equal to 1.4Dmax; Dmax is the maximum distance among distances from a plurality of reference points in the edge of the target gamut to the white point.

[0019] In an exemplary embodiment of the present disclosure, the number of reference points is three, and the three reference points respectively represent magenta, yellow and cyan in the target gamut.

[0020] In an exemplary embodiment of the present disclosure, n=3, and the base colors include red, green and blue; the reference brightness of the target pixel and its initial gray scale satisfy the following relationship:

[0021] gray=k1×R+k2×G+k3×B;

[0022] k1 < k3 < k2;

[0023] gray is the reference luminance of the target pixel, R is the initial gray scale of the target pixel in red, G is the initial gray scale of the target pixel in green, and B is the initial gray scale of the target pixel in blue; k1, k3 and k2 are constants.

[0024] In an exemplary embodiment of the present disclosure, k1 is 0.114; k2 is 0.587; and k3 is 0.2989.

[0025] In an exemplary embodiment of the present disclosure, H is 4; and the contrast of the target pixel satisfies the following formula:

[0026] ;

[0027] C is the contrast of the target pixel; gray(i, j) is the reference luminance of the target pixel; gray(i, j+Δj) is one of the neighborhood pixels adjacent to the target pixel in a first direction; gray(i+Δi, j) is one of the neighborhood pixels adjacent to the target pixel in a second direction; and the first direction and the second direction intersect.

[0028] In an exemplary embodiment of the present disclosure, 60≥the luminance threshold≥20; and 900≥the contrast threshold≥225.

[0029] In an exemplary embodiment of the present disclosure, the control circuit further comprises a second working mode, and in the second working mode, the control circuit is configured to, if the display data of the mth frame of image is received, control the liquid crystal display device to display n sub-field images in sequence to obtain the mth frame of image.

[0030] In the second working mode, the actual gray scale of the pixel is the initial gray scale thereof.

[0031] In an exemplary embodiment of the present disclosure, the liquid crystal display panel comprises:

[0032] an array substrate and an opposite substrate arranged oppositely;

[0033] a liquid crystal layer arranged between the array substrate and the opposite substrate;

[0034] The liquid crystal display device further comprises:

[0035] a backlight module arranged on a side of the array substrate away from the opposite substrate, and comprising n kinds of light emitting devices of different colors, the backlight module emitting light of the same color when displaying the same sub-field image and emitting light of different colors when displaying different sub-field images.

[0036] The control circuit is connected with the array substrate and the backlight module.

[0037] According to one aspect of the present disclosure, there is provided an electronic device, the liquid crystal display device of any one of the preceding items.

[0038] In one exemplary embodiment of the present disclosure, the electronic device further comprises:

[0039] An image acquisition device is configured to acquire an image of the eyeball of the user.

[0040] An image processing device is configured to determine a moving speed of the eyeball based on the image of the eyeball, and control the control circuit to be in the first working mode when the moving speed reaches a speed threshold.

[0041] According to one aspect of the present disclosure, there is provided an image display method for 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:

[0042] In the first working mode:

[0043] receiving display data of an mth frame of image, the display data comprising initial gray scales of each of the pixels under n base colors; m and n are positive integers, and n≥2;

[0044] In each of the base colors, a pixel satisfying at least one of a first condition and a second condition is a target pixel, and a pixel other than the target pixel is a non-target pixel; a plurality of the pixels in the non-target pixel adjacent to the target pixel are neighborhood pixels, and a pixel in the non-target pixel outside the neighborhood pixels is a non-neighborhood pixel; the first condition is that, in a target color gamut in a reference color space, a distance between a target point reflecting a 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 gray scales of the target pixel under the n base colors is greater than a brightness threshold; and / or, a contrast of the target pixel determined based on the reference brightness of the target pixel and reference brightnesses of H neighborhood pixels adjacent to the target pixel is greater than a contrast threshold; H≥1;

[0045] In each base color, a display step is performed to obtain an mth frame of image; the display step comprises:

[0046] determining an intermediate gray scale based on the initial gray scale of the target pixel and an average of initial gray scales of T non-target pixels within a first filter template as an actual gray scale of the target pixel; and determining initial gray scales of at least some of the non-target pixels as their actual gray scales to display a sub-field image of the mth frame of images; a hue of one of the sub-field images is one of the base colors, and hues of different ones of the sub-field images are different; T≥1.

[0047] In one example embodiment of the present disclosure, determining an intermediate gray scale based on the initial gray scale of the target pixel and an average of initial gray scales of T non-target pixels within a first filter template as an actual gray scale of the target pixel comprises:

[0048] determining an average of initial gray scales of U non-target pixels as an intermediate gray scale; the target pixel and the U non-target pixels are within a second filter template; U≥1;

[0049] determining the intermediate gray scale and an average of initial gray scales of T non-target pixels within a first filter template as an actual gray scale of the target pixel.

[0050] In one example embodiment of the present disclosure, the displaying step further comprises:

[0051] determining an average of initial gray scales of W non-target pixels and the actual gray scale of the target pixel as an actual gray scale of one of the W non-target pixels; W≥2; and the target pixel and the W non-target pixels are within a third filter template; the third filter template and the first filter template are of the same size.

[0052] In one example embodiment of the present disclosure, the displaying step further comprises:

[0053] determining an average of initial gray scales of W non-target pixels as an actual gray scale of one of the W non-target pixels; W≥2; and the W non-target pixels are within a third filter template, and the target pixel is outside the third filter template; the third filter template and the first filter template are of the same size.

[0054] In one example 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 a maximum distance among distances of a plurality of reference points in an edge of the target color gamut to the white point.

[0055] In one example embodiment of the present disclosure, the number of reference points is three, and the three reference points represent magenta, yellow and cyan respectively in the target color gamut.

[0056] In an exemplary embodiment of the present disclosure, n=3, and the base colors include red, green and blue; the reference brightness of the target pixel and its initial gray level satisfy the following relationship:

[0057] gray=k1×R+k2×G+k3×B;

[0058] k1

[0059] gray is the reference brightness of the target pixel, R is the gray level of the target pixel in red, G is the gray level of the target pixel in green, and B is the gray level of the target pixel in blue.

[0060] In an exemplary embodiment of the present disclosure, k1 is 0.114; k2 is 0.587; and k3 is 0.2989.

[0061] In an exemplary embodiment of the present disclosure, H is 4; and the contrast of the target pixel satisfies the following formula:

[0062] ;

[0063] gray(i, j) is the reference brightness of the target pixel; gray(i, j+Δj) is one of the neighborhood pixels adjacent to the target pixel in the first direction; gray(i+Δi, j) is one of the neighborhood pixels adjacent to the target pixel in the second direction; and the first direction and the second direction intersect.

[0064] In an exemplary embodiment of the present disclosure, 60≥the brightness threshold≥20; and 900≥the contrast threshold≥225.

[0065] In an exemplary embodiment of the present disclosure, in the second working mode:

[0066] receiving the display data of the mth frame of image;

[0067] displaying n sub-field images in sequence with the initial gray level of the pixel as the actual gray level in each base color to obtain the mth frame of image.

[0068] According to an aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the image display method of any one of the above.

[0069] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not intended to limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0070] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0071] Figure 1 This is a schematic diagram of one embodiment of the liquid crystal display device disclosed herein.

[0072] Figure 2 This is a circuit diagram of one embodiment of the liquid crystal display device disclosed herein.

[0073] Figure 3 This is a partial schematic diagram of the m-th frame image of the liquid crystal display device of the present disclosure in the first operating mode.

[0074] Figures 4-6 for Figure 3 A schematic diagram of the three subfield images of the m-th frame.

[0075] Figure 7 This is a schematic diagram of one embodiment of the electronic device disclosed herein.

[0076] Figure 8 This is a partially enlarged schematic diagram of one embodiment of a liquid crystal display device.

[0077] Figure 9 This is a schematic diagram showing the distribution of target pixels and neighboring pixels in one embodiment of the liquid crystal display device of this disclosure.

[0078] Figure 10 This is a schematic diagram showing the distribution of target pixels and neighboring pixels in another embodiment of the liquid crystal display device disclosed herein.

[0079] Figure 11 This is a schematic diagram showing the coordinates of a target pixel and neighboring pixels in one embodiment of the liquid crystal display device of this disclosure.

[0080] Figure 12 This is a flowchart of one embodiment of the image generation method of this disclosure.

[0081] Figure 13 This is a flowchart of another embodiment of the image generation method disclosed herein.

[0082] Figure 14 The image shows a solution that does not use the method disclosed herein.

[0083] Figure 15 The image shows a solution using this disclosure. Detailed Implementation

[0084] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary 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 concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0085] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to the listed elements / components / etc.; the terms “first,” “second,” etc. are used only as markers and are not a limitation on the number of objects.

[0086] In this article, the first direction X and the second direction Y are two intersecting directions, for example, they are perpendicular, but are not limited to horizontal and vertical directions. Furthermore, the actual orientation of the first direction X and the second direction Y may change as the position of the display panel changes.

[0087] In this article, two adjacent pixels mean 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.

[0088] This disclosure provides a liquid crystal display device, such as... Figure 1 and Figure 2 As shown, the liquid crystal display device may include a liquid crystal display panel PNL and a control circuit CU, wherein:

[0089] A liquid crystal display panel (PNL) has multiple pixels arranged in an array. In the PNL of this disclosure, each pixel is a minimum light-emitting unit. Different pixels can emit different colors. The 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.

[0090] The liquid crystal display panel (PNL) also includes pixel electrodes and a common electrode. The pixel electrodes can be disposed on the array substrate TB, and the common electrode can be disposed on the array substrate TB or the opposing substrate FB, with each pixel including one pixel electrode. The array substrate TB has a driving circuit, and the control circuit CU can be disposed on the array substrate TB. The driving circuit can control the voltage between the pixel electrodes and the common electrode, thereby controlling the deflection degree of the liquid crystal molecules in the liquid crystal layer LL, thus controlling the light transmittance of each pixel and achieving grayscale adjustment for each pixel.

[0091] The liquid crystal display device can further include a backlight module BLU, which can be disposed on a side of the array substrate TB distal from the opposite substrate FB. The backlight module BLU can emit light to the array substrate TB under the control of the control circuit CU.

[0092] In some embodiments, the opposite substrate FB can include a color filter layer, which includes a plurality of filter portions. One pixel can include one filter portion. The filter portion can filter light such that one pixel emits monochromatic light. Different pixels can emit different colors of light. However, the color filter layer can cause a large loss of light. Without increasing the power of the backlight module BLU, the brightness of the liquid crystal display device can be reduced. If the brightness is to be increased, the power of the backlight module BLU needs to be increased, which can increase power consumption.

[0093] To increase the light extraction efficiency without increasing power consumption, in some embodiments, the opposite substrate FB can not include a color filter layer, so as to reduce light loss and increase light extraction efficiency. To realize color display, the backlight module BLU can include n different colors of light emitting devices. The number of light emitting devices of the same color is not particularly limited and can be one or more. The color of light emitted by the backlight module BLU is the color tone of the image. On this basis, in displaying an image, field sequential display can be used. For example, n subfield images can be displayed in sequence in one frame. Each subfield image is a monochromatic image. The gray scale of different pixels can be different in each subfield image, and the gray scale of the same pixel can be different in different subfield images. The backlight module BLU emits light of the same color when displaying the same subfield image, and emits light of different colors when displaying different subfield images. For example, only one color of light emitting device in the backlight module BLU emits light when each subfield image is displayed, so as to make each subfield image have only one color tone, i.e., one color. Thus, based on the visual persistence phenomenon, one frame of image can be obtained.

[0094] Figures 4 to 6 Three subfield images are shown. In different subfield images, the light emitting pixels P form a plurality of stripe patterns. The light emitting pixels in different subfield images can be different or can overlap, i.e., the same pixel can emit light in each subfield image. The three subfield images can form Figure 3 The mth frame of image is shown. It should be noted that, Figure 3 The three subfield images are only used to show the color mixing and visual effect formed, and are not the subfield images.

[0095] In an embodiment, the backlight module BLU can include three light emitting devices, which can emit red light, green light and blue light, respectively. One frame of image can be divided into three subfield images. The color tones of the patterns of the three subfield images are red, green and blue, respectively. The three subfield images are displayed in sequence, and can form one frame of image in visual effect.

[0096] As shown in Figure 2 The control circuit CU can be connected with the array substrate TB and the backlight module BLU, for controlling the backlight module BLU to emit light and controlling the deflection degree of the liquid crystal, i.e. controlling the color and gray scale of each pixel. The control circuit CU can include a timing controller, a gate driving circuit, a source driving circuit, a backlight control circuit, etc., and the constitution thereof is not specially limited herein.

[0097] The inventors find that, when using field sequential display, since one frame of image needs to be mixed by multiple sub-fields of images displayed at different times, when the user blinks, scans or the target in the picture moves, the user can observe red, green and blue simultaneously in the picture, i.e. color breakup phenomenon occurs.

[0098] In order to solve the problem of color breakup, the inventors find multiple conditions related to color breakup, and can determine the pixels with color breakup as target pixels according to the conditions, and set the gray scale of the target pixels as the average of the gray scales of the neighboring pixels, so as to weaken or eliminate the color breakup by reducing the contrast in a targeted manner. The following is an exemplary description:

[0099] First, the basic principle of implementing the display of the present disclosure is described:

[0100] As shown in Figures 2-6 The control circuit CU can include a first working mode, and in the first working mode, the control circuit CU is configured to: when receiving display data of the mth frame of image, control the liquid crystal display device to display n sub-field images in sequence to obtain the mth frame of image; the display data includes initial gray scales of each pixel under n base colors; the color tone of one sub-field image is one base color, and the color tones of different sub-field images are different; m and n are positive integers, and n≥2.

[0101] The display data can be initial data received by the control circuit CU for implementing image display. For example, for electronic devices such as televisions or mobile phones, the control circuit CU can be connected with the mainboard of the electronic device, and the display data can be data output from the mainboard to the control circuit CU. Meanwhile, the display data can include information required for displaying the mth frame of image, which can include initial gray scales of each pixel under n different base colors, i.e. each pixel has n initial gray scales. The initial gray scales of each pixel under the same base color can be transmitted by the same channel, and the initial gray scales of different base colors can be transmitted by different channels, i.e. for any pixel in the mth frame of image, it can include gray scale information of multiple channels, i.e. initial gray scales under each base color.

[0102] For example, n can be 3, and the primary colors can include red, green and blue; the display data of the mth frame image can include initial gray scales of each pixel in red, green and blue respectively, and the initial gray scale can be any gray scale in 0-255. The mth frame image can be formed by mixing the red sub-field image, the green sub-field image and the blue sub-field image displayed in sequence.

[0103] It should be noted that the greater the gray scale 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 the primary color, and the higher the proportion of the primary color for the pixel. The smaller the gray scale, the darker the brightness of the pixel in the primary color, and the lower the proportion of the primary color for the pixel.

[0104] Secondly, the scheme for reducing color separation is described:

[0105] In any sub-field image of the mth frame image:

[0106] As shown in Figures 8-10 In the liquid crystal display device, the pixels meeting at least one of the first condition and the second condition can be selected as the target pixels Pt according to the initial gray scales of the pixels in the primary colors, and the pixels other than the target pixels Pt can be non-target pixels, and the pixels adjacent to the target pixels Pt in the non-target pixels can be the neighborhood pixels Pn of the target pixels. In addition, the non-target pixels located outside the neighborhood pixels Pn are non-neighborhood pixels Pm. That is, if there is color separation, the pixels can be divided into two categories, i.e. the target pixels Pt and the non-target pixels, and the non-target pixels can be divided into two categories, i.e. the neighborhood pixels Pn and the non-neighborhood pixels Pm, or the pixels can be divided into three categories, i.e. the target pixels Pt, the neighborhood pixels Pn and the non-neighborhood pixels Pm. Of course, if there is no color separation, i.e. none of the pixels meets the first condition or the second condition, the pixels are not divided into the target pixels Pt, the neighborhood pixels Pn and the non-neighborhood pixels Pm.

[0107] In some embodiments of the present disclosure, the pixels can be arranged in multiple rows and multiple columns along a first direction X and a second direction Y, and any pixel can be adjacent to eight other pixels, of which two pixels are adjacent to the center pixel in the first direction X and two pixels are adjacent to the center pixel in the second direction Y.

[0108] Of course, the pixels can also adopt other arrangement modes, but any pixel has other pixels adjacent thereto.

[0109] The first condition and the second condition are described in detail as follows:

[0110] The first condition described above is that in a target color gamut in 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.

[0111] According to the initial gray scale of each pixel in the mth frame, the color of each pixel can be determined, and the color of any pixel of the mth frame image can be represented by a point in a target gamut in a reference color space. The target gamut can be a BT.2020 gamut, and of course, other gamuts such as BT.709, DCI-P3, etc. can also be used, which are not particularly limited here. There is also a white point in the target gamut, and the distance between the point representing the non-white pixel and the white point is a certain distance, and the boundary of the target gamut includes points representing each primary color. For example: the distance between the P point in the target gamut and the white point W can satisfy the following formula:

[0112] ;

[0113] dis is the distance between the P point and the white point W; (P.x, P.y) is the coordinate of the P point in the reference color space; (W.x, W.y) is the coordinate of the W point in the reference color space.

[0114] A distance threshold can be set, and for any pixel, if the distance between the point representing the color of the pixel and the white point is less than a distance threshold, it means that the distance between the point and the white point is close, and the color of the point is formed by mixing each primary color. The closer to the white point, the closer the proportion of each primary color, the more difficult to distinguish (from a visual point of view), and the more likely to cause color separation; therefore, the pixel corresponding to the point can be regarded as a target pixel.

[0115] The display data includes the initial gray scale of each pixel under each primary color, and for any pixel of the mth frame image, the initial gray scale after normalization and gamma transformation can obtain a stimulus value of a pixel, for example, the initial gray scale of a pixel under three primary colors is (R, G, B), and the three stimulus values after normalization and gamma transformation are: ((R / 255) gamma , ((G / 255) gamma , ((B / 255) gamma )), 255 is the maximum gray scale of the pixel, and of course, 255 can be replaced by other numerical values, which is determined by the specific performance of the liquid crystal display device; gamma can be 2.2, or 1, 3.3, etc.

[0116] The color coordinates of the color displayed by each pixel can be determined according to the tristimulus values. For example, the display data of the mth frame of image can be first converted and mapped from the original color space to the reference color space. Specifically, the tristimulus values in the original color space determined based on the initial gray scale of any pixel in the display data are converted to the tristimulus values in the reference color space, i.e., the reference tristimulus values. The original color space can be the RGB color space, and the reference color space can be the XYZ color space. In 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, the inverse mapping of the actual mapping corresponding to the actual color gamut of the liquid crystal display device is used to convert back to the original color space, and the gray scale of each pixel under each primary color is determined according to the target tristimulus values, and the pixels of the liquid crystal display panel PNL are controlled according to the gray scale to display a plurality of sub-field images. The detailed process is described below in the description of the related steps of the image display method.

[0117] In the above, the display data is converted and mapped from the original color space to the reference color space, and then converted back to the original color space by the inverse mapping of the actual mapping. The main reason is that in the RGB color space, the color coordinates and the tristimulus values can be negative numbers, and direct calculation with negative numbers can cause errors and affect the calculation of the color coordinates and the tristimulus values. Therefore, the tristimulus values are converted to the XYZ color space to obtain the reference tristimulus values, which are all positive numbers and are convenient for calculation. However, the gray scale in the RGB color space is required for the actual display of the liquid crystal display device, so the reference tristimulus values can be mapped back to the RGB color space for display by the liquid crystal display device.

[0118] The actual mapping in the above can be a matrix determined in advance according to the actual color gamut of the liquid crystal display device. The tristimulus values of any point in the actual color gamut can be converted from the original color space to the reference color space by the actual mapping. The inverse mapping of the 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 before the liquid crystal display device is shipped out through image detection or the like. The actual color gamut of different liquid crystal display devices can be different, and accordingly, the actual mapping can also be different.

[0119] Based on the above description, in some embodiments of the present disclosure, for any liquid crystal display device, a plurality of reference points can be determined in the boundary of the target color gamut. The reference points are points other than the points reflecting the primary colors. Any reference point has a certain distance from the white point. The distance threshold satisfies the following relationship:

[0120] 1.4Dmax≥distance threshold≥Dmax;

[0121] Dmax is the maximum distance between each reference point and the white point.

[0122] Further, 1.3Dmax≥distance threshold≥Dmax, of course, the distance threshold can also be directly 1.4Dmax, 1.3Dmax or Dmax. Wherein, the number of reference points can be three, and the three reference points respectively represent magenta, yellow and cyan in the target color gamut in 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. Since the actual color gamut of different liquid crystal display devices can be different, for different liquid crystal display devices, the distance between the same reference point representing the same color and the white point can be different, so the reference point with the maximum distance from the white point can be selected, and the distance from the white point is taken as Dmax.

[0123] The second condition described above can include two sub-conditions, i.e., a first sub-condition and a second sub-condition, as long as at least one of the two sub-conditions is met, it is considered to meet the second condition, wherein:

[0124] The first sub-condition is that the reference brightness of the target pixel determined based on the initial gray scale of the target pixel under n primary colors is greater than a brightness threshold.

[0125] There is an initial gray scale under each primary color for a target pixel, i.e., there are n initial gray scales for a target pixel, in order to facilitate comparison, a reference brightness can be calculated according to each initial gray scale, the greater the reference brightness, the easier it is to observe color separation; according to optical detection and other methods and experience data, a brightness threshold can be set, when the reference brightness is greater than the brightness threshold, it is determined that the first sub-condition is met, and color separation occurs.

[0126] In some embodiments, the brightness threshold can satisfy: 60≥brightness threshold≥20.

[0127] In some embodiments of the present disclosure, n=3, i.e., the number of primary colors is three, and the three primary colors are red, green and blue. The target pixel can be grayed to obtain a reference brightness, and the reference brightness and its initial gray scale satisfy the following relationship:

[0128] gray=k1×R+k2×G+k3×B;

[0129] k1

[0130] gray is the reference brightness of the target pixel, R is the initial gray scale of the target pixel under red, i.e., the initial gray scale under the red channel; G is the initial gray scale of the target pixel under green, i.e., the initial gray scale under the green channel; B is the initial gray scale of the target pixel under blue, i.e., the initial gray scale under the blue channel; k1, k3 and k2 are constants.

[0131] Since the human eye does not perceive the three colors of red, green and blue to the same extent, and the perception degree is: green>red>blue, the weights of the three colors of red, green and blue in the reference brightness can be represented by k1<k3<k2, the weight is the same as the perception degree, and the weight of green with the highest perception degree is the highest, so as to match the perception degree of the human eye. Further, in some embodiments, k1 can be 0.114 by optical detection or the like; k2 is 0.587; and k3 is 0.2989.

[0132] In other embodiments of the present disclosure, the reference brightness can also be the average of the three initial gray scales, that is, the reference brightness can satisfy the following relationship:

[0133] gray=(R+G+B) / 3;

[0134] gray is the reference brightness of the target pixel, R is the initial gray scale of the target pixel in red, G is the initial gray scale of the target pixel in green, and B is the initial gray scale of the target pixel in blue.

[0135] In other embodiments of the present disclosure, the reference brightness can also be obtained by other ways, for example, the maximum or minimum value of the initial gray scale of the target pixel can be taken as the reference brightness; or the initial gray scale of one of the primary colors can be taken as the reference brightness.

[0136] Any of the above embodiments for implementing gray scale of the target pixel, that is, the way of calculating the reference brightness of the target pixel, can be used for any pixel, and the reference brightness of the neighbor pixel of the target pixel can be obtained by the above-mentioned any embodiment, and the reference brightness of the non-neighbor pixel can also be obtained.

[0137] The second sub-condition is that the contrast of the target pixel determined based on the reference brightness of the target pixel and the reference brightness of the H neighbor pixels adjacent to the target pixel is greater than a contrast threshold; H≥1.

[0138] The reference brightness of the target pixel determined based on the above-mentioned first sub-condition and the H neighbor pixels of the target pixel can be used to calculate the contrast of the target pixel, and H is greater than 1. The greater the contrast, the greater the difference between the reference brightness of the target pixel and the reference brightness of the neighbor pixel, and the more obvious the color separation, so a contrast threshold can be set according to optical detection or the like and experience data, and when the contrast is greater than the contrast threshold, it is determined that the second sub-condition is satisfied and color separation occurs.

[0139] When calculating the contrast of the target pixel, part or all of the neighbor pixels can be selected for calculation, for example, as shown in the following table: Figure 8As shown, the pixels are arranged in a first direction X and a second direction Y, and for a target pixel, the number of neighborhood pixels used to calculate the contrast is H≤8. When selecting the neighborhood pixels participating in the calculation of the contrast, if 2 are selected, 2 neighborhood pixels adjacent to the target pixel in the first direction X or the second direction Y can be selected; if Figure 9 As shown, if 4 are selected, 4 neighborhood pixels adjacent to the target pixel in the first direction X and the second direction Y can be selected; if 6 pixels are selected, 4 neighborhood pixels adjacent to the target pixel in the first direction X and the second direction Y and 2 other neighborhood pixels diagonally distributed relative to the target pixel can be selected; the manner of selecting the neighborhood pixels is not specially limited herein.

[0140] In some embodiments, the contrast threshold value can satisfy: 900≥contrast threshold value≥225.

[0141] In some embodiments of the present disclosure, as shown in Figure 9 and Figure 10 For a target pixel, there are 8 neighborhood pixels, and H is 4, i.e. 4 neighborhood pixels are selected to calculate the contrast; the 4 neighborhood pixels are 4 neighborhood pixels adjacent to the target pixel in the first direction X and the second direction Y, which are uniformly distributed around the target pixel. The contrast of the target pixel satisfies the following formula:

[0142] ;

[0143] C is the contrast of the target pixel; gray(i,j) is the reference luminance of the target pixel; gray(i,j+Δj) is the reference luminance of a neighborhood pixel adjacent to the target pixel in the first direction X; gray(i+Δi,j) is the reference luminance of a neighborhood pixel adjacent to the target pixel in the second direction Y.

[0144] In some embodiments of the present disclosure, as shown in Figure 10 and Figure 11 For a target pixel, there are 8 neighborhood pixels, and H is 8, i.e. 8 neighborhood pixels are selected to calculate the contrast. The contrast of the target pixel satisfies the following formula:

[0145] ;

[0146] C is the contrast of the target pixel; gray(i,j) is the reference luminance of the target pixel; gray(i,j+Δj) is the reference luminance of a neighborhood pixel adjacent to the target pixel in the first direction X; gray(i+Δi,j) is the reference luminance of a neighborhood pixel adjacent to the target pixel in the second direction Y; gray(i+Δi,j+Δj) is the reference luminance of a neighborhood pixel adjacent to the target pixel in the first and second directions Y.

[0147] like Figure 12 As shown, for the first condition and the first and second sub-conditions of the second condition mentioned above, satisfying at least one of them is sufficient to determine that color separation exists. For example:

[0148] In some embodiments of this disclosure, such as Figure 13 As shown, a coarse screening can be performed by first determining whether the first condition is met; if the first condition is met, a first fine screening can be performed by determining whether the first sub-condition is met; if the first sub-condition is met, a second fine screening can be performed by determining whether the second sub-condition is met. If the first condition, the first sub-condition, and the second sub-condition are met in sequence, color separation can be determined, and the target pixel and its neighboring pixels can be identified. In this embodiment, the target pixel can be screened using three different standards (distance, grayscale, and contrast), resulting in high accuracy and avoiding the identification of pixels that have not undergone color separation as target pixels.

[0149] Of course, in other embodiments of this disclosure, the second condition may be satisfied even if the first condition is not satisfied; or the first condition may be satisfied but the second condition may not be satisfied.

[0150] Furthermore, it is possible to evaluate only one of the first and second conditions instead of evaluating all conditions. For example, if the first condition is met, it is determined that color separation exists, and the second condition is not evaluated. Alternatively, it is possible to directly evaluate whether the second condition is met without evaluating the first condition; as long as the second condition is met, color separation is considered to exist. The same principle applies when evaluating the first and second sub-conditions; only one can be evaluated.

[0151] Based on the two conditions above, pixels other than the target pixels can be considered 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, while non-neighboring pixels are non-target pixels not adjacent to the neighboring pixels. A filtering operation can be performed centered on the target pixel, that is, the actual gray level is determined based on the initial gray level, thereby reducing or eliminating color separation. This will be explained in detail below:

[0152] In any subfield image, the actual gray level of the target pixel can be the average of the intermediate gray level determined based on its initial gray level and the initial gray levels of T non-target pixels, while the actual gray level of at least some of the non-target pixels is its initial gray level; the target pixel and the T non-target pixels are located within the first filter template, and T ≥ 1. In some embodiments, the T non-target pixels are all neighborhood pixels. In other embodiments, T > 1, and the T non-target pixels include at least some neighborhood pixels and some non-neighborhood pixels.

[0153] The first filter template is used to represent a certain area or range, and the size of the first filter template 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 Z1xZ1 pixels, i.e., Z1 pixels arranged continuously in the first direction X and Z1 pixels arranged continuously in the second direction Y. Z1 is an integer greater than 2, for example, Z1 is 3, and the first filter template is 3x3 pixels. The T pixels can be part or all of the Z1xZ1 pixels.

[0154] Further, 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 the pixels around the target pixel are evenly selected. The neighborhood pixels in the T pixels can be evenly distributed around the target pixel. Z1 can be an odd number, for example, 3, 5, etc., to ensure that the target pixel is located at the center.

[0155] In some embodiments of the present disclosure, the intermediate gray level is the average of the initial gray level of the target pixel and the initial gray levels of U non-target pixels, and U≥1. The target pixel and the U non-target pixels are located in the second filter 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 part of the neighborhood pixels and part of the non-neighborhood pixels. U can be equal to T or not equal to T.

[0156] The second filter template can have the same meaning as the first filter template, and is also used to represent a certain area and range, and the size of the second filter template can also be represented by Z1xZ1 pixels. However, the size of the second filter template is not necessarily the same as that of the first filter template, and can be smaller than or equal to that of the first filter template. For example, the second filter template is 3x3 pixels, and the first filter template is also 3x3 pixels; or the second filter template is 5x5 pixels, and the first filter template is also 3x3 pixels; or the second filter template is 3x3 pixels, and the first filter template is also 5x5 pixels.

[0157] That is, the target pixel and the plurality of non-target pixels can be first screened out by using the second filter template, and the average of the initial gray levels of the target pixel and the U non-target pixels is calculated to obtain the intermediate gray level, i.e., the first round of filtering operation is performed on the target pixel. Then, the target pixel and the plurality of non-target pixels are screened out by using the first filter template, and the average of the initial gray levels of the intermediate gray level and the T non-target pixels is calculated to obtain the actual gray level of the target pixel, i.e., the second round of filtering operation is performed.

[0158] In some embodiments of this disclosure, the intermediate gray level is the initial gray level of the target pixel, and the actual gray level of the target pixel is the average of its initial gray level and the initial gray levels of T non-target pixels. In this embodiment, the target pixel and multiple non-target pixels can be screened using only the first filtering template, and the average of the intermediate gray level and the initial gray levels of the T non-target pixels can be calculated to obtain the actual gray level of the target pixel. Thus, the average value is calculated only once, instead of twice.

[0159] Based on the above implementation method, when the liquid crystal display device displays any subfield image, it is a monochromatic image. For a target pixel, the grayscale used is not its initial grayscale, but an average value. In this way, the contrast of the target pixel relative to its surrounding pixels can be reduced, thereby weakening or eliminating color separation.

[0160] Since each pixel has an initial grayscale level under each primary color, if there are three primary colors, then each pixel has three initial grayscale levels. When calculating the actual grayscale level, it can be calculated separately under each primary color, thus obtaining the actual grayscale level of the target pixel under each primary color. For example, for a target pixel, its actual grayscale level under the red primary color is the average of its middle grayscale level under red and the initial grayscale levels of T non-target pixels; its actual grayscale level under the green primary color is the average of its middle grayscale level under green and the initial grayscale levels of T neighboring pixels; its actual grayscale level under the blue primary color is the average of its middle grayscale level under blue and the initial grayscale levels of T pixels.

[0161] In some implementations, such as Figure 9 and Figure 10 As shown, the target pixel has 8 neighboring pixels, and T can be 4, 8, etc., but not all T pixels are necessarily neighboring pixels. For example, if the size of the first filter template is 5×5 pixels, then T can include some neighboring pixels and some non-neighboring pixels, without special limitation here. 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, and T is 4, meaning 4 neighboring pixels are selected to calculate the average value; the 4 neighboring pixels are the 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.

[0162] When calculating the actual grayscale of a target pixel under any primary color, the following formula can be used:

[0163] ;

[0164] mean(i,j) is the actual gray level; Z1 is the number of pixels in the first filter template centered on the target pixel in the first direction X and the second direction Y; input(i+s,j+k) is the initial gray level of the pixels used to calculate the actual gray level of the target pixel.

[0165] The above formula can be used when calculating the actual grayscale of target pixels under different primary colors.

[0166] In some embodiments of this disclosure, filtering operations can be performed on non-target pixels surrounding the 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, at most 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.

[0167] like Figures 8-10 As shown, in some embodiments of this disclosure, under any subfield image of the m-th frame:

[0168] There exists at least one non-target pixel whose actual gray level is the average of the initial gray levels of the W non-target pixels (including the non-target pixel) and the actual gray level of the target pixel; the W non-target pixels and the target pixel are located within the third filter template, and W ≥ 2.

[0169] In one embodiment, the non-target pixel targeted by the filtering operation can be a neighboring pixel, and the filtering operation can be performed simultaneously on some or all of the neighboring pixels, depending on the size of W. The size of the third filtering template for each neighboring pixel is the same, for example, 3×3 pixels. Of course, in other embodiments, the filtering operation can also be performed on non-neighboring pixels independently.

[0170] The meaning of the third filtering template can be the same as that of the first and second filtering templates, and its size can also be represented by Z1×Z1 pixels. Simultaneously, the third filtering template can have the same size as the first filtering template, for example, both being 3×3 or 5×5 pixels. This allows filtering operations on non-target pixels and filtering operations on target pixels based on the first filtering template to be performed simultaneously, with filtering templates of equal size. Therefore, when filtering non-target pixels, it is not necessary to identify and exclude target pixels for filtering, which improves operational efficiency. Furthermore, while performing the first filtering operation on non-target pixels, a second filtering operation is performed on target pixels; these two operations constitute a second round of filtering, which can further reduce the contrast between the target pixel and its surroundings, weakening color separation. Based on the aforementioned scheme, the number of filtering operations performed on target pixels is one more than the number of filtering operations performed on non-target pixels.

[0171] Further, in a sub-field image of the mth frame image, the above filtering operation can also be performed on more non-target pixels, i.e. a third round or more of filtering operation is carried out, and the specific manner is still to take a non-neighbor pixel as the center to calculate the average value of the gray levels of the pixels within the filtering template; if the filtering template includes the target pixel and the non-target pixel targeted by the second round of filtering operation, the gray levels used to calculate the average value are the actual gray levels of the target pixel and the non-target pixel targeted by the second round of filtering operation; the gray level of the non-target pixel that has not been subjected to the filtering operation is the initial gray level. In this way, the picture outside the target pixel can be further smoothed, the contrast can be reduced, and the color separation can be improved. Of course, the filtering template can also not include any of the target pixel and the non-target pixel targeted by the second round of filtering operation.

[0172] In an embodiment, each round of filtering operation includes filtering the pixels that have been subjected to the filtering operation, avoiding specifically excluding the pixels that have been subjected to the filtering operation.

[0173] Further, the third filtering template can include the target pixel, but the target pixel is not located at the center of the third filtering template, but a non-target pixel is taken as the center so as to uniformly select the pixels around the neighborhood pixel. The pixels other than the non-target pixel located at the center and the target pixel in the W pixels can be uniformly distributed around the non-target pixel located at the center. Z1 can be an odd number, for example, 3, 5, etc., to ensure that a neighborhood pixel is located at the center.

[0174] As shown in FIG. 5, in another embodiment of the present disclosure, the third filtering template can also not include the target pixel, i.e. the target pixel is located outside the third filtering template. Figures 8-10

[0175] In any sub-field image of the mth frame image:

[0176] The actual gray level of at least one non-target pixel is the average value of the initial gray levels of the W non-target pixels including the non-target pixel; and the W non-target pixels are located within the third filtering template; W≥2; the third filtering template and the second filtering template are of the same size.

[0177] In the present embodiment, the non-target pixel subjected to the filtering operation can be a non-neighbor pixel, and the initial gray level and the actual gray level of the target pixel can not participate in the calculation when the filtering operation is performed on the non-target pixel, i.e. when the average value is calculated. The calculation formula of the average value of the gray levels can refer to the calculation formula of the actual gray level of the target pixel under any primary color described above, which will not be described in detail here.

[0178] ​In addition, in some embodiments of the present disclosure, the control circuit CU further comprises a second working mode, and in the second working mode, the control circuit CU is configured to: if the display data of the mth frame of image is received, control the liquid crystal display device to display the n sub-field images in sequence to obtain the mth frame of image; m and n are positive integers, and n is greater than or equal to 2. The actual gray scale of each pixel is the initial gray scale thereof.

[0179] In the second working mode, the display is directly performed according to the display data, without reselecting the target pixels according to the first condition and the second condition, and without calculating the actual gray scale according to the initial gray scale.

[0180] The first working mode and the second working mode in the above embodiments can be started when a start signal is received. For example, the image of the eyeball of the user can be acquired by the image acquisition device, and the movement speed of the eyeball can be determined by the image processing device according to the image of the eyeball. When the movement speed reaches a speed threshold, the color separation phenomenon is more obvious. At this time, the control circuit CU can be in the first working mode to eliminate the color separation. When the movement speed does not reach the speed threshold, the color separation phenomenon can not be obvious. At this time, the control circuit CU can be in the second working mode, thereby improving the operation efficiency.

[0181] The electronic device provided by the embodiments of the present disclosure can comprise the liquid crystal display device, and the structure of the liquid crystal display device can be the liquid crystal display device in any of the above embodiments, which will not be described herein again.

[0182] As shown in Figure 7 The electronic device further comprises an image acquisition device and an image processing device, wherein:

[0183] The image acquisition device CAM can comprise one or more cameras, and of course, other devices capable of acquiring image information of human or object features can also be used. The image acquisition device CAM can acquire the image of the eyeball of the user in real time.

[0184] The image processing device CP can be connected with the image acquisition device CAM, and can determine the movement speed of the eyeball according to the image of the eyeball. When the movement speed reaches a speed threshold, the image processing device CP outputs a start signal to the control circuit CU, so that the control circuit CU is in the first working mode. When the movement speed does not reach the speed threshold, the image processing device CP does not output the start signal, and the control circuit CU is in the second working mode.

[0185] The image processing device CP can identify the pupil center according to the image of the eyeball, and determine the movement speed of the eyeball according to the change of the position of the pupil center.

[0186] In some embodiments, the electronic device can further comprise an infrared detection device, which can locate the corneal center of the user through infrared light, and the line connecting the corneal center and the pupil center identified by the image processing device is the optical axis of the visual system, and the real visual line direction can be obtained according to the included angle between the optical axis and the visual axis. In addition, a hot mirror can be further included to reduce the tracking error without affecting the display of the picture; or the infrared light and the eye image can be transmitted by using an optical waveguide.

[0187] In addition, the eye tracking can also be realized by other ways, which are not particularly limited here.

[0188] The electronic device of the present disclosure can be a mobile phone, a television, a tablet computer, and can also be a smart glasses and the like head-mounted display device, which are not listed one by one here.

[0189] For the liquid crystal display device and the electronic device of the present disclosure, whether the related products fall within the protection scope of the present disclosure can be judged by the following ways, so as to constitute infringement:

[0190] 1. Whether the related products comprise a liquid crystal display panel and a control circuit, wherein the liquid crystal display panel has a plurality of light-emitting pixels. As long as there are a plurality of light-emitting units realized by liquid crystal for display, and there is a circuit for controlling these units, it can be considered that the liquid crystal display panel and the control circuit are included.

[0191] 2. In the boot state, whether the control circuit receives a signal from the outside and transmits the signal to the pixel. If so, whether a frame image comprises a plurality of monochrome images displayed in sequence, i.e. sub-field images, is judged, which belongs to field sequential display, and the basic principle of realizing display is the same as the present disclosure. The number of sub-field images in a frame image is not limited.

[0192] 3. In the boot state, in the low-contrast area of any sub-field image, whether there is a pixel whose gray scale is the average of the gray scales of the adjacent pixels is determined by the way of image detection combined with the way of obtaining the pixel voltage and other signals of the pixel. If so, whether the initial gray scale of the pixel meets at least one of the first condition and the second condition is determined based on the detected pixel voltage and other data of the pixel, and if so, it falls within the protection scope of the present disclosure.

[0193] In addition, for the liquid crystal display device of the present disclosure, the inventors have carried out tests, and the present disclosure also provides test results, as shown in Figure 14 and Figure 15 Each pixel directly displays an image according to the initial gray scale, i.e. the actual gray scale is the initial gray scale, and the image is a white bar (R, G, B initial gray scales are (255, 255, 255)).

[0194] As shown in Figure 14As shown, by using the scheme of the present disclosure, the actual gray scale of the white bar edge will be less than 255, and the actual performance is edge blur and reduced brightness, as shown in Figure 15 As shown, 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 the filtering operation on the target pixel and the neighborhood pixels, i.e., the target pixel is filtered twice. The actual gray scale of the pixels of the left edge of the white bar increases in turn along the direction close to the central axis of the white bar, i.e., (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 to it, which will not be described in detail here, and is not shown in the figure.

[0195] The embodiment of the present disclosure provides an image display method, which can be used in a liquid crystal display device, the structure of which can refer to the liquid crystal display device of any of the above embodiments, which will not be described here. As shown in Figure 12 The image display method of the present disclosure comprises:

[0196] Steps S110-S130 are performed in the first working mode, wherein:

[0197] Step S110, receiving display data of the mth frame of image, the display data comprising initial gray scales of each pixel under n base colors; the color of one subfield image is one base color, and the colors of different subfield images are different; m and n are positive integers, and n≥2;

[0198] Step S120, under each base color, the pixel satisfying at least one of the first condition and the second condition is a target pixel, and the pixel other than the target pixel is a non-neighborhood pixel; a plurality of pixels adjacent to the target pixel in the non-neighborhood pixel are neighborhood pixels, and the pixels outside the neighborhood pixels in the non-neighborhood pixel are non-neighborhood pixels; the first condition is that in a target color gamut in 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 the reference brightness of the pixel is greater than a brightness threshold; and / or, the contrast of the pixel determined based on the reference brightness of the pixel and the reference brightness of H pixels adjacent to it is greater than a contrast threshold; H≥1;

[0199] Step S130, under each base color, performing a display step to obtain the mth frame of image; the display step comprises:

[0200] determining an intermediate gray scale based on the initial gray scale of the target pixel and an average of the initial gray scales of T non-target pixels in the first filter template as an actual gray scale of the target pixel; and determining the initial gray scale of at least part of the non-target pixels as an actual gray scale of the non-target pixels to display a sub-field image of the mth frame image; a hue of one of the sub-field images is one of the base colors, and hues of different sub-field images are different.

[0201] The steps will be described in detail below in conjunction with examples:

[0202] In step S110, the display data can be initial data received by the control circuit CU for implementing image display. For example, for electronic devices such as televisions or mobile phones, the control circuit CU can be connected to the mainboard of the electronic device, and the display data can be data output by the mainboard to the control circuit CU. Meanwhile, the display data can include information required for displaying the mth frame image, which can include initial gray scales of each pixel under n different base colors, i.e., each pixel has n initial gray scales. The initial gray scales of each pixel under the same base color can be transmitted by the same channel, and the initial gray scales of different base colors can be transmitted by different channels.

[0203] For example, n can be 3, and the base colors can include red, green, and blue; the display data of the mth frame image includes initial gray scales of each pixel under red, green, and blue, and the initial gray scales can be any gray scale in 0-255. The mth frame image can be formed by mixing the red sub-field image, the green sub-field image, and the blue sub-field image displayed in sequence.

[0204] It should be noted that the greater the gray scale of a pixel under a base color, the higher the transmittance of the liquid crystal, the more light passes through, and the higher the brightness of the pixel under the base color. For the pixel, the proportion of the base color is higher. The smaller the gray scale, the darker the brightness of the pixel under the base color, and for the pixel, the proportion of the base color is lower.

[0205] In step S120, under each base color, it is determined whether there is a pixel satisfying at least one of the first condition and the second condition, and if so, the pixel satisfying at least one of the first condition and the second condition is taken as a target pixel. Meanwhile, a plurality of pixels adjacent to the target pixel can be taken as neighborhood pixels, and pixels outside the neighborhood pixels can be taken as non-neighborhood pixels.

[0206] The specific content of the first condition and the second condition has been described in the above embodiment of the liquid crystal display device, and will not be described again here.

[0207] In determining whether the first condition is satisfied, steps S1210 and S1230 can be used, wherein:

[0208] Step S1210, determining the color coordinates of each pixel in the target gamut in the reference color space according to the initial gray scale of each pixel.

[0209] The target gamut can be BT.2020 gamut, of course, other gamuts such as BT.709, DCI-P3, etc. can also be used, which are not particularly limited here. There is also a white point in the target gamut, which reflects that there is a certain distance between the point of the non-white pixel and the white point, and the boundary of the target gamut includes points representing each primary color. Each pixel can be represented by a point in the target gamut, and pixels of different colors are represented by different points. At the same time, there is also a white point in the target gamut.

[0210] Step S1220, respectively calculating the distance between each point representing the pixel and the white point.

[0211] The distance between the P point representing the color of a pixel in the target gamut and the white point W can satisfy the following formula:

[0212] ;

[0213] dis is the distance between the P point and the white point W; (P.x, P.y) is the coordinate of the P point in the reference color space; (W.x, W.y) is the coordinate of the W point in the reference color space.

[0214] Step S1230, comparing the distance between each point representing the color of a pixel and the white point with the distance threshold value, and determining that the first condition is satisfied when the distance is less than the distance threshold value.

[0215] The distance threshold value has been described above and will not be repeated here.

[0216] When determining whether the second condition is satisfied, whether the first sub-condition and the second sub-condition are satisfied can be determined respectively, wherein:

[0217] When determining whether the first sub-condition is satisfied, the reference luminance of the target pixel can be calculated, compared with the luminance threshold value, and determined that the first sub-condition is satisfied when the reference luminance is greater than the luminance threshold value. The calculation method of the reference luminance has been described above and will not be repeated here.

[0218] When determining whether the second sub-condition is satisfied, steps S1240 and 1250 can be used, wherein:

[0219] Step S1240, determining the contrast of the target pixel under any primary color according to the reference luminance of the target pixel and the reference luminance of the H adjacent pixels adjacent to the target pixel; H≥1.

[0220] The calculation of the contrast can refer to the description of the contrast in the embodiment of the liquid crystal display device above, which will not be described in detail here.

[0221] In some embodiments of the present disclosure, for a target pixel, there are 8 neighboring pixels, H is 4, i.e. 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:

[0222] ;

[0223] C is the contrast of the target pixel; gray(i,j) is the reference luminance 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.

[0224] In step S1250, the contrast of the target pixel is compared with the contrast threshold, and when it is less than the contrast threshold, it is determined that the second sub-condition is satisfied.

[0225] In some embodiments of the present disclosure, the contrast threshold can satisfy: 900≥contrast threshold≥225.

[0226] In some embodiments of the present disclosure, step S130 can include step S1310 and step S1320, wherein:

[0227] In step S1310, the initial gray scale of the target pixel and the average value of the initial gray scales of U non-target pixels are taken as an intermediate gray scale; the target pixel and the U non-target pixels are located in the second filtering template; U≥1;

[0228] In step S1320, the intermediate gray scale and the average value of the initial gray scales of T non-target pixels in the first filtering template are taken as the actual gray scale of the target pixel.

[0229] In some other embodiments of the present disclosure, the intermediate gray scale is the initial gray scale of the target pixel, and the filtering operation on the target pixel is only performed once. When the filtering operation is performed on the non-target pixel, the filtering operation on the target pixel is no longer performed.

[0230] In any sub-field image, the actual gray scale of the target pixel can be the average of the intermediate gray scale determined based on the initial gray scale of the target pixel and the initial gray scales of the T non-target pixels, i.e., the filtering operation is performed on the target pixel, while the actual gray scales of at least some of the non-target pixels are the initial gray scales thereof; T≥1. Specifically, when the liquid crystal display device displays any sub-field image, which is a single-tone image, for a target pixel, the gray scale adopted by the target pixel is not the initial gray scale thereof, but an average value, which is the average of the intermediate gray scale of the target pixel and the initial gray scales of the T non-target pixels. In this way, the contrast of the target pixel relative to the neighboring pixels can be reduced, so that the color separation phenomenon can be weakened or eliminated.

[0231] Since each pixel has an initial gray scale under each primary color, if the primary colors are three, each pixel has three initial gray scales, and when the actual gray scale is calculated, the actual gray scales of the target pixel under each primary color can be calculated respectively. For example, for a target pixel, the actual gray scale thereof under the red primary color is the average of the intermediate gray scale thereof under the red primary color and the initial gray scales of the T non-target pixels; the actual gray scale thereof under the green primary color is the average of the intermediate gray scale thereof under the green primary color and the initial gray scales of the T neighboring pixels; and the actual gray scale thereof under the blue primary color is the average of the intermediate gray scale thereof under the blue primary color and the initial gray scales of the T pixels.

[0232] When the actual gray scale of the target pixel under any primary color is calculated, the following formula can be used:

[0233] ;

[0234] mean(i,j) is the actual gray scale; Z1 is the number of pixels of the first filtering template centered on the target pixel in the first direction X and the second direction Y; input(i+s,j+k) is the initial gray scale of the pixel used to calculate the actual gray scale of the target pixel.

[0235] When the actual gray scales of the target pixel under different primary colors are calculated, the above formula can be used.

[0236] In some embodiments of the present disclosure, the filtering operation can be performed again with the non-target pixels around the target pixel as the center, so as to further reduce the contrast, improve the color separation phenomenon, and improve the smoothness of the picture. For details, reference can be made to the filtering operation in the above embodiments of the liquid crystal display device, which will not be described herein again.

[0237] In addition, the non-target pixels can also be selected in sequence in a direction away from the target pixel, and the above filtering operation can be performed. The specific manner has been described in detail above, which will not be described herein again.

[0238] As Figure 12As shown, for the liquid crystal display device of the present disclosure, if there is no pixel satisfying at least one of the first condition and the second condition, the original step S140 can be performed, i.e., the initial gray scale of each pixel is taken as the actual gray scale thereof for display.

[0239] In combination with the above steps, in some embodiments of the present disclosure, the image generation method can include steps S210-S260, wherein: in step 210, display data can be received; in step S220, it can be determined whether the first condition is satisfied, and when the first condition is satisfied, step S230 is performed, i.e., it is determined whether the first sub-condition is satisfied, and when the first sub-condition is satisfied, step S240 is performed, i.e., it is determined whether the second sub-condition is satisfied, and when the second sub-condition is satisfied, the display step is performed to perform the filtering operation; if any one of the first condition, the first sub-condition and the second sub-condition is not satisfied, the original step S260 is performed to display according to the initial gray scale. The details of the above steps have been described in detail above, and will not be described here.

[0240] In addition, in some embodiments of the present disclosure, the image display method of the present disclosure can further include:

[0241] In the second working mode:

[0242] The display data of the mth frame of image is received, and the display data includes n different reference primary colors;

[0243] The n sub-field images are displayed in sequence according to the target primary color to obtain the mth frame of image; the hue of a sub-field image is a reference primary color, and the hues of different sub-field images are different; m and n are positive integers, and n is greater than or equal to 2.

[0244] The display data includes n different reference primary colors, the hue of a sub-field image is a reference primary color, and the hues of different sub-field images are different.

[0245] In the second working mode, the actual gray scale of the pixel is the initial gray scale thereof.

[0246] The first working mode and the second working mode in the above can be started when a start signal is received, for example, the image of the eyeball of the user can be collected by the image collection device, and the movement speed of the eyeball can be determined by the image processing device according to the image of the eyeball, and when the movement speed reaches the speed threshold, the color separation phenomenon can be more obvious, at this time, the control circuit can be in the first working mode to eliminate the color separation. When the movement speed does not reach the speed threshold, the color separation phenomenon can not be obvious, at this time, the control circuit can be in the second working mode, thereby improving the running efficiency.

[0247] It is noted that, although the various steps of the image display method of the present disclosure are described in a particular order in the accompanying drawings, this is not required or implied that the steps must be performed in this particular order, or that all of the steps shown must be performed to achieve the desired result. Additionally or alternatively, certain steps can be omitted, multiple steps can be combined into one step, one step can be broken down into multiple steps, etc.

[0248] The present disclosure also provides a computer readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the image display method.

[0249] From the above description of the embodiments, those skilled in the art will readily appreciate that the example embodiments described herein can be implemented by software and / or by hardware combined with software. Accordingly, the technical solutions 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 U disk, 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 perform the image generation method according to the embodiments of the present disclosure.

[0250] Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure following the general principles thereof and including such departures from the present disclosure that come within known use or custom in the art. The specification and examples are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A 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 control circuit comprises a first working mode, configured to control the liquid crystal display device to display n sub-field images in sequence to obtain the mth frame image when receiving display data of the mth frame image; the display data comprises initial gray scales of each pixel under n base colors. a hue of one of the sub-field images is one of the base colors, and hues of different ones of the sub-field images are different; m and n are positive integers, and n≥2; T≥1； in any one of the sub-field images of the mth frame of images: the pixels comprise a target pixel and non-target pixels, the non-target pixels comprise a plurality of neighborhood pixels adjacent to the target pixel and non-neighborhood pixels outside the neighborhood pixels; an actual gray scale of the target pixel is an intermediate gray scale determined based on an initial gray scale of the target pixel and an average of initial gray scales of T non-target pixels; the target pixel and the T non-target pixels are located within a first filter template; actual gray scales of at least some of the non-target pixels are initial gray scales of the non-target pixels; the target pixel satisfies at least one of a first condition and a second condition; the first condition is that, in a target gamut in a reference color space, a distance between a target point reflecting a color of the target pixel and a white point is less than a distance threshold; the second condition is that a reference luminance of the target pixel determined based on initial gray scales of the target pixel in n base colors is greater than a luminance threshold; H≥1； and / or, a contrast of the target pixel determined based on the reference luminance of the target pixel and reference luminances of H neighborhood pixels adjacent to the target pixel is greater than a contrast threshold; 2. The liquid crystal display device according to claim 1, wherein the intermediate gray scale is an average of the initial gray scale of the target pixel and initial gray scales of U non-target pixels; the target pixel and the U non-target pixels are located within a second filter template; U≥1. in any one of the sub-field images of the mth frame of images: an actual gray scale of one of the non-target pixels is an average of initial gray scales of W non-target pixels including the non-target pixel and an actual gray scale of the target pixel; and the target pixel and the W non-target pixels are located within a third filter template; W≥2; 3. The liquid crystal display device according to claim 1, wherein the third filter template and the first filter template are of the same size. in any one of the sub-field images of the mth frame of images: W≥2； an actual gray scale of one of the non-target pixels is an average of initial gray scales of W non-target pixels including the non-target pixel and an actual gray scale of the target pixel; and the target pixel and the W non-target pixels are located within a third filter template; W≥2; 4. The liquid crystal display device according to claim 2 or 3, wherein the third filter template and the first filter template are of the same size.

5. The liquid crystal display device according to claim 4, wherein the distance threshold is greater than or equal to Dmax and less than or equal to 1.4Dmax; Dmax is a maximum distance among distances of a plurality of reference points on an edge of the target gamut and the white point.

6. The liquid crystal display device according to claim 1, wherein the number of the reference points is three, and the three reference points represent magenta, yellow and cyan respectively in the target gamut. n=3, and the base colors comprise red, green and blue; the reference luminance of the target pixel and the initial gray scale of the target pixel satisfy the following relationship: gray=k1×R+k2×G+k3×B; k1 gray is a reference luminance of the target pixel, R is an initial gray scale of the target pixel in red, G is an initial gray scale of the target pixel in green, and B is an initial gray scale of the target pixel in blue; k1, k3 and k2 are constants.

7. The liquid crystal display device according to claim 6, wherein k1 is 0.114; k2 is 0.587; and k3 is 0.2989.

8. The liquid crystal display device according to claim 6, wherein H is 4; and a contrast of the target pixel satisfies the following formula: ； C is a contrast of the target pixel; gray(i, j) is a reference luminance of the target pixel; and gray(i, j+Δj) is a reference luminance of a neighborhood pixel adjacent to the target pixel in a first direction; gray(i+Δi, j) is a reference luminance of a neighborhood pixel adjacent to the target pixel in a second direction; and the first direction and the second direction intersect.

9. The liquid crystal display device according to claim 1, wherein 60≥ the luminance threshold≥20; and 900≥ the contrast threshold≥225.

10. The liquid crystal display device according to claim 1, wherein The control circuit further comprises a second working mode, and is configured to, in the second working mode, control the liquid crystal display device to display n sub-field images in sequence to obtain the mth frame of image if the display data of the mth frame of image is received. In the second working mode, an actual gray scale of the pixel is an initial gray scale thereof.

11. The liquid crystal display device according to any one of claims 1-10, wherein, The liquid crystal display panel comprises: an array substrate and an opposite substrate arranged oppositely; a liquid crystal layer arranged between the array substrate and the opposite substrate; The liquid crystal display device further comprises: a backlight module arranged on a side of the array substrate away from the opposite substrate, and comprising n kinds of light emitting devices of different colors, the backlight module emitting light of the same color when displaying the same sub-field image and emitting light of different colors when displaying different sub-field images; The control circuit is connected with the array substrate and the backlight module.

12. An electronic device comprising the liquid crystal display device of any one of claims 1-11.

13. The electronic device of claim 12, wherein, The electronic device further comprises: an image acquisition device configured to acquire an image of an eyeball of a user; an image processing device configured to determine a moving speed of the eyeball according to the image of the eyeball, and control the control circuit to be in the first working mode when the moving speed reaches a speed threshold.

14. An image display method, the image display method being used for 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 a first working mode: receiving display data of an mth frame of image, the display data comprising initial gray scales of the pixels in n base colors; m and n are positive integers, and n≥2. gray is a reference luminance of the target pixel, R is an initial gray scale of the target pixel in red, G is an initial gray scale of the target pixel in green, and B is an initial gray scale of the target pixel in blue; k1, k3 and k2 are constants. k1 is 0.114; k2 is 0.587; and k3 is 0.2989. H is 4; and a contrast of the target pixel satisfies the following formula: C is a contrast of the target pixel; gray(i, j) is a reference luminance of the target pixel; and gray(i, j+Δj) is a reference luminance of a neighborhood pixel adjacent to the target pixel in a first direction; gray(i+Δi, j) is a reference luminance of a neighborhood pixel adjacent to the target pixel in a second direction; and the first direction and the second direction intersect. 60≥ the luminance threshold≥20; and 900≥ the contrast threshold≥225. The control circuit further comprises a second working mode, and is configured to, in the second working mode, control the liquid crystal display device to display n sub-field images in sequence to obtain the mth frame of image if the display data of the mth frame of image is received. In the second working mode, an actual gray scale of the pixel is an initial gray scale thereof. The liquid crystal display panel comprises: an array substrate and an opposite substrate arranged oppositely; a liquid crystal layer arranged between the array substrate and the opposite substrate; The liquid crystal display device further comprises: a backlight module arranged on a side of the array substrate away from the opposite substrate, and comprising n kinds of light emitting devices of different colors, the backlight module emitting light of the same color when displaying the same sub-field image and emitting light of different colors when displaying different sub-field images; The control circuit is connected with the array substrate and the backlight module.

12. An electronic device comprising the liquid crystal display device of any one of claims 1-11. The electronic device further comprises: an image acquisition device configured to acquire an image of an eyeball of a user; an image processing device configured to determine a moving speed of the eyeball according to the image of the eyeball, and control the control circuit to be in the first working mode when the moving speed reaches a speed threshold.

14. An image display method, the image display method being used for 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 a first working mode: receiving display data of an mth frame of image, the display data comprising initial gray scales of the pixels in n base colors; m and n are positive integers, and n≥2. In each of the base colors, a pixel satisfying at least one of a first condition and a second condition is a target pixel, and a pixel other than the target pixel is a non-target pixel; a plurality of the pixels adjacent to the target pixel among the non-target pixels are neighborhood pixels, and the pixels other than the neighborhood pixels among the non-target pixels are non-neighborhood pixels; the first condition is that, in a target gamut in a reference color space, a distance between a target point reflecting a color of the target pixel and a white point is less than a distance threshold; and the second condition is that a reference brightness of the target pixel determined based on initial gray scales of the target pixel in n base colors is greater than a brightness threshold. And / or, a contrast of the target pixel determined based on the reference brightness of the target pixel and reference brightnesses of H neighborhood pixels adjacent to the target pixel is greater than a contrast threshold. H≥1； In each base color, a display step is performed to obtain an mth frame of image. The display step includes: an intermediate gray scale determined based on the initial gray scale of the target pixel and an average of the initial gray scales of T non-target pixels in a first filter template are taken as an actual gray scale of the target pixel; and the initial gray scales of at least part of the non-target pixels are taken as actual gray scales of the non-target pixels to display a sub-field image of the mth frame of image; a hue of a sub-field image is a base color, and hues of different sub-field images are different; T≥1. an intermediate gray scale determined based on the initial gray scale of the target pixel and an average of the initial gray scales of T non-target pixels in a first filter template are taken as an actual gray scale of the target pixel; includes: an intermediate gray scale is determined based on the initial gray scale of the target pixel and an average of the initial gray scales of U non-target pixels; the target pixel and the U non-target pixels are in a second filter template; U≥1. an average of the initial gray scales of T non-target pixels in a first filter template is taken as an actual gray scale of the target pixel.

15. The image display method according to claim 14, wherein The display step further includes: an average of the initial gray scales of W non-target pixels and an actual gray scale of the target pixel are taken as an actual gray scale of one of the W non-target pixels; W≥2; and the target pixel and the W non-target pixels are in a third filter template; the third filter template and the first filter template are of the same size.

16. The image display method according to claim 14, wherein The display step further includes: an average of the initial gray scales of W non-target pixels is taken as an actual gray scale of one of the W non-target pixels; W≥2; and the W non-target pixels are in a third filter template, and the target pixel is outside the third filter template; the third filter template and the first filter template are of the same size.

17. The image display method according to claim 14 or 15, wherein The distance threshold is greater than or equal to Dmax, and less than or equal to 1.4Dmax. Dmax is a maximum distance among distances between a plurality of reference points and the white point on an edge of the target gamut.

18. The image display method according to claim 17, wherein The number of the reference points is three, and the three reference points represent magenta, yellow and cyan respectively in the target gamut.

19. The image display method according to claim 14, wherein n=3, and the base colors include red, green and blue; a reference luminance of the target pixel and its initial gray scale satisfy the following relationship: gray=k1×R+k2×G+k3×B; k1 gray is the reference luminance of the target pixel, R is the gray scale of the target pixel under red color, G is the gray scale of the target pixel under green color, and B is the gray scale of the target pixel under blue color.

20. The image display method according to claim 19, wherein k1 is 0.114; k2 is 0.587; and k3 is 0.2989.

21. The image display method according to claim 19, wherein H is 4; and the contrast of the target pixel satisfies the following formula: ； gray(i,j) is the reference luminance of the target pixel; gray(i,j+Δj) is the reference luminance of one of the neighborhood pixels adjacent to the target pixel in the first direction; gray(i+Δi,j) is the reference luminance of one of the neighborhood pixels adjacent to the target pixel in the second direction; and the first direction and the second direction intersect.

22. The image display method according to claim 14, wherein 60≥the luminance threshold≥20; and 900≥the contrast threshold≥225.

23. The image display method according to claim 14, wherein In the second working mode: receiving the display data of the mth frame of image; displaying n sub-field images in turn with the initial gray scale of the pixel as the actual gray scale under each base color to obtain the mth frame of image. 24.A computer readable storage medium having stored thereon a computer program, the computer program being executed by a processor to implement the image display method according to any one of claims 14-23.

Images