Liquid crystal display device, image display method, and electronic apparatus

Abstract

The invention relates to a liquid crystal display device, an image display method and electronic equipment, and relates to the field of display. The liquid crystal display device comprises a liquid crystal display panel and a control circuit, the liquid crystal display panel comprises a liquid crystal display substrate and a backlight module, the liquid crystal display substrate comprises a plurality of pixels, the backlight module comprises a plurality of backlight areas, and the backlight areas comprise light-emitting devices of n colors; the control circuit comprises a first working mode, and in the first working mode, the control circuit is configured to receive an mth frame of initial image and control each liquid crystal display panel to display n different sub-field images in sequence so as to obtain an mth frame of actual image; m and n are positive integers, and n > = 2; the initial image comprises initial color information of each pixel; the initial color information of one pixel comprises initial gray scales under n hues; under a sub-field image, the backlight area comprises a first backlight area and a plurality of second backlight areas; the first backlight area and the second backlight area emit light with different tones; and the second backlight areas emit light with the same color tone.

Description

Technical Field

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

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

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

[0004] The purpose of the present disclosure is to overcome the deficiencies of the above-mentioned prior art and to provide a liquid crystal display device, an image display method and an electronic device, which can reduce the color separation phenomenon while reducing power consumption and improving resolution.

[0005] According to one aspect of the present disclosure, there is provided a liquid crystal display device, comprising a liquid crystal display panel and a control circuit, wherein the liquid crystal display panel comprises a liquid crystal display substrate and a backlight module, wherein the liquid crystal display substrate comprises a plurality of pixels, and the backlight module comprises a plurality of backlight regions, wherein each of the backlight regions comprises light-emitting devices of n colors;

[0006] The control circuit includes a first working mode, and in the first working mode is configured to: receive an m-th frame of initial image, control each of the liquid crystal display panels to sequentially display n different sub-field images, so as to obtain the m-th frame of actual image; m and n are positive integers, n≥2; the initial image includes initial color information of each of the pixels; the initial color information of the pixel includes initial grayscales under n tones;

[0007] In one of the sub-field images, the backlight area includes a first backlight area and a plurality of second backlight areas; the first backlight area and the second backlight area emit light of different tones; and the second backlight areas emit light of the same tones.

[0008] In an exemplary embodiment of the present disclosure, under one of the sub-field images, the backlight area includes a plurality of first backlight areas; and at least two of the first backlight areas emit light with different tones.

[0009] In an exemplary embodiment of the present disclosure, in a frame of actual image, the color reflected by the initial color information of the pixel corresponding to the first backlight area is located in a first reference color gamut determined based on n first reference primary colors; the color reflected by the initial color information of the pixel corresponding to each second backlight area is located in a second reference color gamut determined based on n second reference primary colors;

[0010] In one of the sub-field images, the color tone of the first backlight area is the first reference primary color; and the color tone of the second backlight area is the second reference primary color.

[0011] In an exemplary embodiment of the present disclosure, based on the initial color information of each pixel in a frame of an initial image, the pixels include edge pixels and color separation pixels; the color separation pixels are pixels whose brightness is greater than a brightness threshold and whose saturation is less than a saturation threshold.

[0012] In an exemplary embodiment of the present disclosure, taking one of the backlight areas as the center, a plurality of the backlight areas adjacent to the backlight area are neighboring backlight areas of the backlight area at the center; one of the neighboring backlight areas of the first backlight area is a target neighboring backlight area;

[0013] In a frame of initial image, the color feature difference between the first backlight area and the target neighborhood backlight area is not less than the color feature difference between the first backlight area and other neighborhood backlight areas; the color feature difference of the backlight area is determined based on the color feature determined by the hue of each pixel corresponding to the backlight area.

[0014] In an exemplary embodiment of the present disclosure, in a frame of initial image, the color features of any specified area satisfy the following relationship:

[0015] H1+H2=C;

[0016] C is the color feature of the designated area; H1 is the average value of the largest T% of the hues of the pixels corresponding to the designated area; H2 is the average value of the hues of the pixels corresponding to the designated area;

[0017] The color characteristic difference between two adjacent backlight areas is the absolute value of the difference between the color characteristics of the two backlight areas.

[0018] In an exemplary embodiment of the present disclosure, n=3, the initial grayscale of the pixel in an initial image frame is (R, G, B), R is the grayscale of red, G is the grayscale of green, and B is the grayscale of blue;

[0019] In a frame of the initial image, the hue of a pixel corresponding to a specified area satisfies the following relationship:

[0020] h=floor(hs×30), hs≥0; or

[0021] h=hs+180,hs<0;

[0022] h is the hue of the pixel; hs is the reference hue of the pixel;

[0023] The reference hue satisfies the following relationship:

[0024] If the largest of the initial gray levels of a pixel is the red gray level R; then hs = (GB) / ((R-min(R, G, B));

[0025] If the largest of the initial grayscales of a pixel is the green grayscale G, then hs=2+(BR) / ((G-min(R, G, B));

[0026] If the largest of the initial grayscales of a pixel is the blue grayscale B, then hs=4+(RG) / (B-min(R, G, B));

[0027] min(R, G, B) is the minimum grayscale among the initial grayscales of the pixel.

[0028] 8. According to any one of the above-mentioned liquid crystal display devices, each of the backlight areas is divided into a plurality of sub-areas along a first direction and is divided into a plurality of sub-areas along a second direction; the first direction intersects with the second direction;

[0029] In an initial image, the grayscale features of any specified area satisfy the following relationship:

[0030] Gm+Ga=Gf;

[0031] Gf is the grayscale feature of the designated area; Gm is the maximum grayscale of the grayscales of the pixels corresponding to the designated area; Ga is the average grayscale of the pixels corresponding to the designated area;

[0032] In an initial image frame, the grayscale of a pixel and its initial grayscale satisfy the following relationship:

[0033] G = k1 × R + k2 × G + k3 × B;

[0034] k1, k2 and k3 are all positive numbers;

[0035] In a frame of initial image, the number of edge pixels corresponding to the first backlight area is not less than an edge threshold, and the number of color separation pixels corresponding to the first backlight area is not less than a separation threshold; the first backlight area satisfies at least one of the following first condition, second condition and third condition:

[0036] The first condition is that the difference in color characteristics between the first backlight area and the target neighborhood backlight area is not greater than a first threshold;

[0037] The second condition is: the color feature difference between the first backlight area and the target neighborhood backlight area is greater than the first threshold and not greater than the second threshold; the color feature difference between the first backlight area and the adjacent sub-area in the target neighborhood backlight area is not greater than the first threshold;

[0038] The third condition is: the difference in color characteristics between the first backlight area and the target neighborhood backlight area is greater than the first threshold, and the grayscale characteristic of at least one of the adjacent sub-areas between the first backlight area and the target neighborhood backlight area is not greater than the grayscale threshold;

[0039] The second backlight area does not satisfy the first condition, the second condition, and the third condition.

[0040] In an exemplary embodiment of the present disclosure, in a frame of initial image, the number of edge pixels corresponding to the first backlight area is less than the edge threshold, and the number of color separation pixels corresponding to the first backlight area is not less than the separation threshold; the first backlight area satisfies the fourth condition:

[0041] The fourth condition is that: the color feature difference between the first backlight area and the target neighborhood backlight area is not greater than a first threshold; and the first backlight area is adjacent to at least one of the first backlight areas;

[0042] The second backlight area does not satisfy the fourth condition.

[0043] In an exemplary embodiment of the present disclosure, the number of color separation pixels corresponding to the first backlight area is less than a separation threshold; and the first backlight area satisfies a fifth condition:

[0044] The fifth condition is: the first backlight area is adjacent to at least one of the first backlight areas;

[0045] The second backlight area does not satisfy the fifth condition.

[0046] In an exemplary embodiment of the present disclosure, the control circuit further includes a second working mode, and in the second working mode is configured to: receive an m-th frame initial image, and control the liquid crystal display device to sequentially display n subfield images according to initial color information of each pixel to obtain an m-th frame image;

[0047] In a subfield image of the second working mode, light emitting devices of the same color in each backlight area emit light.

[0048] In an exemplary embodiment of the present disclosure, the liquid crystal display substrate includes:

[0049] An array substrate and a counter substrate arranged opposite to each other;

[0050] A liquid crystal layer, disposed between the array substrate and the counter substrate;

[0051] The control circuit is connected to the array substrate and the backlight module.

[0052] According to one aspect of the present disclosure, there is provided an image display method for a liquid crystal display device, wherein the liquid crystal display device comprises a liquid crystal display panel and a control circuit, wherein the liquid crystal display panel comprises a liquid crystal display substrate and a backlight module, wherein the liquid crystal display substrate comprises a plurality of pixels, and the backlight module comprises a plurality of backlight areas, wherein each of the backlight areas comprises light-emitting devices of n colors; the image display method comprises:

[0053] In the first working mode:

[0054] Receive an m-th frame of initial image, wherein the initial image includes initial color information of each pixel; the initial color information of each pixel includes initial grayscales under n tones; m and n are positive integers, and n≥2;

[0055] Determine the actual color tone of each of the backlight areas under n sub-field images according to the initial color information;

[0056] Controlling each of the backlight areas to emit light according to the actual color tone, and controlling the pixels according to the initial grayscale to sequentially display n different subfield images to obtain the mth frame actual image;

[0057] In one of the sub-field images, the backlight area includes a first backlight area and a plurality of second backlight areas; the actual tones of light emitted by the first backlight area and the second backlight area are different; and the actual tones of light emitted by each of the second backlight areas are the same.

[0058] In an exemplary embodiment of the present disclosure, determining the actual color tone of each of the backlight areas under n sub-field images according to the initial color information comprises:

[0059] Determine edge pixels in the initial image according to the initial color information;

[0060] Determine the hue, saturation and brightness of each pixel according to the initial color information;

[0061] Determine the color separation pixel and the color characteristics and grayscale characteristics of each of the backlight areas according to the hue, saturation and brightness of each of the pixels; the color separation pixel is a pixel whose brightness is greater than a brightness threshold and whose saturation is less than a saturation threshold;

[0062] Dividing each of the backlight areas into at least a first backlight area and a second backlight area according to the color characteristics and the grayscale characteristics of the backlight area;

[0063] Establishing a first reference color gamut according to the color reflected by the initial color information of the pixel corresponding to the first backlight area, and determining n first reference primary colors according to the first reference color gamut;

[0064] Establishing a second reference color gamut according to the color reflected by the initial color information of the pixels corresponding to each of the second backlight areas, and determining n second reference primary colors according to the second reference color gamut;

[0065] Controlling each of the backlight areas to emit light according to the actual color tone; comprising:

[0066] In one of the sub-field images, the actual color tone of the light emitted from the first backlight area is controlled to be the first reference primary color; and the actual color tone of the light emitted from the second backlight area is controlled to be the second reference primary color.

[0067] In an exemplary embodiment of the present disclosure, determining edge pixels in the initial image according to the initial color information comprises:

[0068] Gray-scaling the initial image to obtain the gray scale of each pixel;

[0069] Determine the gradient magnitude and gradient direction of each pixel according to the grayscale of each pixel;

[0070] An edge pixel among the pixels is determined according to the gradient magnitude and the gradient direction of the pixels.

[0071] In an exemplary embodiment of the present disclosure, n=3, the initial grayscale of the pixel in an initial image frame is (R, G, B), R is the grayscale of red, G is the grayscale of green, and B is the grayscale of blue;

[0072] In a frame of initial image, the hue of a pixel satisfies the following relationship:

[0073] h=floor(hs×30), hs≥0; or

[0074] h=hs+180,hs<0;

[0075] h is the hue of the pixel; hs is the reference hue of the pixel;

[0076] The reference hue satisfies the following relationship:

[0077] If the largest of the initial gray levels of a pixel is the red gray level R; then hs = (GB) / ((R-min(R, G, B));

[0078] If the largest of the initial grayscales of a pixel is the green grayscale G, then hs=2+(BR) / ((G-min(R, G, B));

[0079] If the largest of the initial grayscales of a pixel is the blue grayscale B, then hs=4+(RG) / (B-min(R, G, B));

[0080] min(R, G, B) is the minimum grayscale among the initial grayscales of the pixel;

[0081] The saturation of the pixel satisfies the following relationship:

[0082] S = 1-W / max(R, G, B);

[0083] S is the saturation of the pixel; W is the second largest grayscale among the initial grayscales of the pixel; max(R, G, B) is the largest grayscale among the initial grayscales of the pixel;

[0084] The brightness of a pixel is the maximum gray level among its initial gray levels.

[0085] In an exemplary embodiment of the present disclosure, the color separation pixel is a pixel having a brightness less than a brightness threshold and a saturation greater than a saturation threshold;

[0086] In an initial image, the color features of any specified area satisfy the following relationship:

[0087] H1+H2=C;

[0088] C is the color feature of the designated area; H1 is the average value of the largest T% of the hues of the pixels corresponding to the designated area; H2 is the average value of the hues of the pixels corresponding to the designated area;

[0089] The color characteristic difference between two adjacent backlight areas is the absolute value of the difference between the color characteristics of the two backlight areas;

[0090] In an initial image, the grayscale features of any specified area satisfy the following relationship:

[0091] Gm+Ga=Gf;

[0092] Gf is the grayscale feature of the designated area; Gm is the maximum grayscale of the grayscales of the pixels corresponding to the designated area; Ga is the average grayscale of the pixels corresponding to the designated area;

[0093] In an initial image frame, the grayscale of a pixel and its initial grayscale satisfy the following relationship:

[0094] G = k1 × R + k2 × G + k3 × B;

[0095] k1, k2 and k3 are all positive numbers.

[0096] In an exemplary embodiment of the present disclosure, each of the backlight areas is divided into at least a first backlight area and a second backlight area according to the color characteristics and grayscale characteristics of the backlight area; comprising:

[0097] Dividing each of the backlight areas into a plurality of sub-areas along a first direction and into a plurality of sub-areas along a second direction; the first direction intersects the second direction;

[0098] Selecting one of the backlight areas in which the number of edge pixels is not less than the edge threshold and the number of color separation pixels is not less than the separation threshold as a first backlight area to be divided;

[0099] Taking the first backlight area to be divided as the center, respectively determining the color feature difference and grayscale feature difference between the first backlight area to be divided and its adjacent neighborhood backlight area; and taking the neighborhood backlight area with the largest color feature difference as the target neighborhood backlight area;

[0100] Determine the difference in color characteristics between the first backlight area to be divided and the adjacent sub-areas in the target neighborhood backlight area;

[0101] If the color feature difference between the first backlight area to be divided and the target neighborhood backlight area is not greater than a first threshold, the first condition is met, and the first backlight area to be divided is the first backlight area;

[0102] If the color feature difference between the first backlight area and the target neighborhood backlight area is greater than the first threshold and not greater than the second threshold; the color feature difference between the first backlight area to be divided and the adjacent sub-areas in the target neighborhood backlight area is not greater than the first threshold; then the second condition is met and the first backlight area to be divided is the first backlight area;

[0103] If the difference in color characteristics between the first backlight area and the target neighborhood backlight area is greater than the first threshold, and the grayscale characteristic of at least one of the adjacent sub-areas between the first backlight area and the target neighborhood backlight area is not greater than the grayscale threshold, then the third condition is met and the first backlight area to be divided is the first backlight area;

[0104] If the first condition, the second condition and the third condition are not satisfied, the first backlight area to be divided is the second backlight area.

[0105] In an exemplary embodiment of the present disclosure, each of the backlight areas is divided into at least a first backlight area and a second backlight area according to the color characteristics and the grayscale characteristics of the backlight area; further comprising:

[0106] Select one from the backlight areas where the number of edge pixels corresponding to the first backlight area is less than the edge threshold and the number of color separation pixels corresponding to the first backlight area is not less than the separation threshold as the second backlight area to be divided;

[0107] If the difference in color characteristics between the second backlight area to be divided and the target neighboring backlight area is not greater than a first threshold; and at least one of the neighboring backlight areas of the second backlight area to be divided is the first backlight area, then the fourth condition is met and the second backlight area to be divided is the first backlight area; if the fourth condition is not met, then the second backlight area to be divided is the second backlight area.

[0108] In an exemplary embodiment of the present disclosure, each of the backlight areas is divided into at least a first backlight area and a second backlight area according to the color characteristics and the grayscale characteristics of the backlight area; further comprising:

[0109] Selecting one from the backlight areas where the number of color separation pixels is less than the separation threshold as a third backlight area to be divided;

[0110] If the third backlight area to be divided is adjacent to at least one of the first backlight areas, the fifth condition is met and the third backlight area to be divided is the first backlight area; if the fifth condition is not met, the third backlight area to be divided is the second backlight area.

[0111] According to one aspect of the present disclosure, an electronic device is provided, comprising any one of the above-mentioned liquid crystal display devices.

[0112] The liquid crystal display device, image display method, and electronic device disclosed in the present invention can achieve field sequential display by temporally mixing the colors of n sub-field images displayed successively, without adopting a spatial color mixing method and without setting a color filter, which can improve the light output efficiency, and without setting sub-pixels of different colors, which is conducive to improving the resolution.

[0113] In addition, in the first working mode, under a subfield image, the first backlight area and the second backlight area emit light in different tones, so that different areas of the subfield image do not use the same primary color, but can use different primary colors. In this process, since the first backlight area and the second backlight area are parts of the liquid crystal display panel, the color gamut determined by the color of the corresponding pixels is smaller than the color gamut determined by the color of all pixels, which makes the difference between the primary colors of the first backlight area and the second backlight area under different subfield images smaller than the difference in the primary colors under different subfield images determined based on the color of all pixels, and the reduction of the primary color difference can weaken the color separation phenomenon. Therefore, the primary color difference can be reduced and the color separation phenomenon can be improved by determining the primary color based on the backlight area as a unit, rather than determining the primary color based on the entire liquid crystal display panel.

[0114] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0115] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0116] Figure 1 It is a schematic structural diagram of an embodiment of a liquid crystal display device disclosed in the present invention.

[0117] Figure 2 This is a circuit diagram of an embodiment of a liquid crystal display device disclosed herein.

[0118] Figure 3 It is a partial schematic diagram of the mth frame image of the liquid crystal display device of the present disclosure in the first working mode.

[0119] Figure 4-Figure 6 for Figure 3 Schematic diagram of the three subfield images of the mth frame image.

[0120] Figure 7 It is a schematic diagram of an embodiment of the electronic device disclosed herein.

[0121] Figure 8 The figure is a flowchart of the image processing method disclosed in the present invention.

[0122] Fig. 9 The figure is a schematic diagram of a first backlight area and a second backlight area in the liquid crystal display device disclosed in the present invention.

[0123] Fig.10 It is a schematic diagram of a first backlight area and its neighboring backlight areas in the liquid crystal display device disclosed in the present invention. DETAILED DESCRIPTION

[0124] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0125] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0126] The present 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 and a control circuit CU, wherein:

[0127] The liquid crystal display panel has a plurality of pixels distributed in an array, and a pixel is the smallest display unit. The liquid crystal display panel may include a liquid crystal display substrate PNL and a backlight module BLU, and the liquid crystal display substrate PNL may include an array substrate TB and an opposing substrate FB arranged opposite to each other, and may also include a liquid crystal layer LL arranged between the array substrate TB and the opposing substrate FB.

[0128] The liquid crystal display substrate PNL also includes pixel electrodes and common electrodes. The pixel electrodes may be provided on the array substrate TB, the common electrodes may be provided on the array substrate TB or the counter substrate FB, and one pixel may include one pixel electrode and its corresponding liquid crystal layer LL. The array substrate TB has a driving circuit, and the control circuit CU may be provided on the array substrate TB, and the voltage between the pixel electrode and the common electrode may be controlled by the driving circuit, thereby controlling the deflection degree of the liquid crystal molecules of the liquid crystal layer LL, and further controlling the transmittance of each pixel to light, thereby adjusting the gray scale of each pixel.

[0129] The backlight module BLU may be disposed on a side of the array substrate TB away from the counter substrate FB. The backlight module BLU may emit light to the array substrate TB under the control of the control circuit CU.

[0130] In some embodiments, the counter substrate FB may include a color filter layer, the color filter layer includes a plurality of filter parts, and a pixel may include a filter part. Through the filtering effect of the filter part, a pixel emits monochromatic light, and different pixels may emit different colors. However, the color filter layer will cause a large loss of light, and will reduce the brightness of the liquid crystal display device without increasing the power of the backlight module BLU. If the brightness is to be increased, the power of the backlight module BLU needs to be increased, resulting in increased power consumption.

[0131] In order to improve the light extraction efficiency without increasing power consumption, in some embodiments, the opposing substrate FB may not be provided with a color filter layer to reduce light loss, which is beneficial to improving the light extraction efficiency. In order to achieve color display, the backlight module BLU may include light-emitting devices of n different colors. The number of light-emitting devices of the same color is not specifically limited here, and the number of light-emitting devices of each color is multiple. The color of the light emitted by the backlight module BLU is the hue of the picture. The light emitted by the backlight module BLU can be used as a light source for displaying images, and the pixel can control the deflection state of the liquid crystal, thereby controlling the grayscale of the pixel, and the image display is achieved through the cooperation of the backlight module BLU and the pixel.

[0132] On this basis, when displaying images, field sequential display can be used. For example, n subfield images are displayed in sequence within one frame. The colors of different subfield images can be different. In each subfield image, the grayscales of different pixels can be different, and the grayscales of the same pixel in different subfield images can be different.

[0133] The color of the subfield image can be limited by the light color of the backlight module BLU. For example, in some embodiments, when displaying the same subfield image, when displaying each subfield image, only one color of the light emitting device in the backlight module BLU emits light, so that each subfield image has only one hue, that is, one color. Thus, based on the phenomenon of persistence of vision, a frame of image can be obtained.

[0134] In some embodiments, the backlight module BLU can be divided into a plurality of backlight areas BA, each backlight area BA has light-emitting devices of n colors, and each light-emitting device can be independently controlled. One backlight area BA can correspond to a plurality of pixels, that is, the positive projections of a plurality of pixels on the backlight module BLU are located in one backlight area BA. The brightness of the light-emitting devices in different backlight areas BA can be different, so that the brightness of different backlight areas BA can be different, and the backlight area BA control can be realized.

[0135] like Figure 2 As shown, in some embodiments of the present disclosure, the control circuit CU may be used to execute one or more working modes, including a first working mode. In the first working mode:

[0136] The control circuit CU is configured to receive the initial color information of each pixel of the mth frame initial image, and control the brightness of each backlight area BA and the grayscale of the pixel according to the initial color information, so as to sequentially display n subfield images of different tones to obtain the mth frame actual image. m and n are positive integers, n≥2.

[0137] The initial color information of each pixel may include the initial grayscale under n tones. For a pixel of an initial frame of an image, the grayscales of n tones may be displayed in sequence to achieve temporal color mixing, so that the pixel presents a predetermined color. For example, n=3, and the three tones are red, green, and blue. The initial color information of each pixel of the mth frame of the image may include the initial grayscale of red, the initial grayscale of green, and the initial grayscale of blue.

[0138] The n tones are the n primary colors of the actual image of the mth frame, that is, the actual image of the mth frame is formed by mixing n primary colors. Under a field sequence image, each backlight area BA of the backlight module BLU emits light with the same tone, and only the light-emitting devices of the same color emit light. The brightness of different backlight areas BA can be different, which can be achieved by controlling the power of the light-emitting devices of the backlight area BA or controlling the number of light-emitting devices that actually emit light.

[0139] After receiving the mth frame of the initial image, the color gamut range of the mth frame of the initial image can be determined according to the color reflected by the initial color information of all pixels, and n primary colors, that is, n tones, can be determined according to the color gamut range. Under the same subfield image, each backlight area BA has the same tones. For example, the color gamut range can be represented by a color gamut triangle containing the colors of all pixels of the mth frame of the initial image in the RGB color space, and the three vertices of the triangle can be used as three primary colors. Based on this, under each subfield image, only one color of the light-emitting device in each backlight area BA emits light.

[0140] Figures 4 to 6 Three subfield images are shown. In different subfield images, the luminous pixels P form multiple stripe patterns. The luminous pixels in different subfield images may be different or overlapped, that is, the same pixel may emit light in each subfield image. Figure 3 The mth frame image is shown. It should be noted that Figure 3 It is only used to illustrate the color mixing and visual effects formed by the three sub-field images in principle, and does not constitute a limitation on the specific pattern of the sub-field images.

[0141] In one embodiment, the backlight module BLU may include three light emitting devices, which can emit red light, green light and blue light respectively. A frame image can be divided into three sub-field images, and the tones of the patterns of the three sub-field images are red, green and blue respectively. The three sub-field images are displayed in sequence to form a frame image in visual effect.

[0142] like Figure 2As shown, the control circuit CU can be connected to the array substrate TB and the backlight module BLU to control the light emission of the backlight module BLU and the degree of deflection of the liquid crystal, that is, to control the color and grayscale of each pixel. The control circuit CU may include a timing controller, a gate drive circuit, a source drive circuit, a backlight control circuit, etc., and its composition is not particularly limited here.

[0143] The inventors have found that when field sequential display is used, since one frame of actual image needs to be mixed by multiple sub-field images that are not displayed at the same time, when the user blinks, glances, or the target in the picture moves, the user may observe three tones of red, green, and blue in the picture at the same time, that is, color separation occurs. At the same time, under a sub-field image, only one color of the light emitting device emits light, so that the saturation of the light emitted by each backlight area BA is the highest, that is, the saturation of the primary color is the highest, which makes the difference between the primary colors larger, and the above-mentioned color separation phenomenon is more obvious.

[0144] The inventors have found through research that the primary color can be determined separately by the area corresponding to at least part of the backlight area BA of the backlight module BLU, and the saturation of the primary color can be reduced, thereby weakening the color separation phenomenon. An exemplary description is given below:

[0145] In the first working mode, the control circuit CU can be configured to execute an image display method, such as Figure 8 As shown, the image display method may include steps S10 to S30, wherein:

[0146] Step S10, receiving initial color information of the mth frame of the initial image, the initial color information of each pixel includes initial grayscales under n tones; m and n are positive integers, n≥2;

[0147] Step S20, determining the actual color tone of each backlight area BA under n sub-field images according to the initial color information;

[0148] Step S30 , controlling each backlight area BA to emit light according to the actual color tone, and controlling the pixels according to the initial gray scale, and sequentially displaying n different sub-field images to obtain the mth frame actual image.

[0149] like Fig. 9As shown, in a subfield image, the backlight area BA includes a first backlight area BA1 and a plurality of second backlight areas BA2; by executing the image display method disclosed in the present invention, the hues of light emitted by the first backlight area BA1 and the second backlight area BA2 can be different; the hues of light emitted by each second backlight area BA2 are the same. The areas corresponding to different backlight areas BA (the first backlight area BA1 and the second backlight area BA2) of the subfield image may not use the same primary color, but different primary colors. In this process, the first backlight area BA1 and the second backlight area BA2 are local parts of the liquid crystal display panel, and the color gamut determined by the color of the corresponding pixels is smaller than the color gamut determined by the color of all pixels, which makes the difference between the primary colors of the first backlight area BA1 and the second backlight area BA2 in different subfield images smaller than the difference in the primary colors in different subfield images determined based on the color of all pixels, and the reduction in the difference in primary colors can weaken the color separation phenomenon.

[0150] The following is a detailed description of the image display method:

[0151] In step S10, any frame of the initial image may include the initial color information of each pixel, and the initial color information of each pixel in the frame of the initial image includes initial grayscales in n different tones. n may be a positive integer greater than or equal to 2, for example, n=3, and the three tones are red, green, and blue, respectively; the initial grayscale of a pixel may include an initial grayscale R of red, an initial grayscale G of green, and an initial grayscale B of blue, and the initial grayscale of the pixel may be expressed as (R, G, B). Any initial grayscale may be any integer between 0 and 255. Among them, the initial image is not the image actually displayed by the liquid crystal display panel, but a collection of initial color information of each pixel.

[0152] In step S20, the actual hue of each backlight area BA under n subfield images can be obtained based on the initial color information of each pixel in the mth frame initial image, and under the same subfield image, the actual hues of different backlight areas BA can be the same or different. A backlight area BA has light-emitting devices of n luminous colors, and the actual hue of the backlight area BA is formed by mixing the light emitted by the light-emitting devices that actually emit light. For example, if only red light-emitting devices in a backlight area BA emit light, its actual hue is red, and if all red light-emitting devices and some green light-emitting devices in a backlight area BA emit light, its actual hue is no longer red, but will be yellowish and mixed into other colors. The actual hue can be controlled by controlling the number of light-emitting devices that actually emit light. The actual hue is a primary color when the backlight area BA displays the mth frame image, that is, the color of the backlight area BA when displaying a field sequence image.

[0153] For a backlight area BA, a color gamut range can be determined according to the color reflected by the initial color information of the corresponding pixel, and the primary color can be determined according to the color gamut range, thereby determining the actual color tone of the backlight area BA. It is also possible to take multiple backlight areas BA as a whole, determine a color gamut range according to the color reflected by the initial color information of the pixels corresponding to the multiple backlight areas BA, and determine the primary color according to the color gamut range, thereby simultaneously determining the actual color tones of the multiple backlight areas BA, and the actual color tones of these backlight areas BA in the same field sequence image are the same.

[0154] If the actual hue is determined independently for each backlight area BA, the actual hues of different backlight areas BA may be different, and the diffusion of light in the backlight area BA will cause crosstalk between adjacent backlight areas BA, resulting in color shift. In particular, the color shift is more obvious for backlight areas BA with large contrast in actual hue. In order to reduce the degree of color shift while improving separation, the backlight areas BA can be dynamically classified based on the initial color information of each frame of the initial image, and divided into at least the first backlight area BA1 and the second backlight area BA2. The actual hue is determined separately for the first backlight area BA1, and the actual hue can be determined for multiple second backlight areas BA2 as a whole; the following is a detailed description:

[0155] In some embodiments of the present disclosure, step S20 may include steps S210 to S240.

[0156] in:

[0157] Step S210: determining edge pixels in the initial image according to the initial color information.

[0158] For an initial image frame, edge detection may be performed on it according to an edge detection algorithm to determine edge pixels in the initial image frame. For example, Canny edge detection or other methods may be used to perform edge detection.

[0159] In some embodiments of the present disclosure, for a frame of initial image, step S210 may include steps S2110 to S2140, wherein:

[0160] Step S2110: grayscale the initial image to obtain the grayscale of each pixel.

[0161] Taking n=3 and the initial grayscale of each pixel as (R, G, B) in the above text as an example, in an initial image frame, the grayscale of a pixel and its initial grayscale satisfy the following relationship:

[0162] G = k1 × R + k2 × G + k3 × B;

[0163] G is the grayscale of the pixel, R is the initial grayscale of red, G is the initial grayscale of blue, and B is the initial grayscale of blue. k1, k2, and k3 are all positive numbers. Since the human eye is more sensitive to green than red, and more sensitive to red than blue, for example, k1 can be 0.3, k2 can be 0.59, and k3 can be 0.11.

[0164] Step S2120: filter the grayscale of each pixel.

[0165] The smoothness of the grayscale of each pixel can be improved by filtering, and the filtering method can be Gaussian filtering, which is not specifically limited here. For example, a filter template is used to scan each pixel one by one, and the scanned pixel is the pixel located at the center of the filter template. The range of the filter template may include multiple pixels. For example, the filter template may include 3×3 pixels or 5×5 pixels. The average value or weighted average value of the grayscale of the pixels within the range of the filter template is used as the new grayscale of the pixel at the center of the filter template, but the new grayscale does not participate in the calculation of the new grayscale of other pixels, that is, the grayscale obtained in step S2110 is used when calculating the new grayscale during the filtering process.

[0166] Step S2130: determine the gradient magnitude and gradient direction of each pixel according to the grayscale of each pixel.

[0167] Let (i, j) be the coordinates of a pixel in a coordinate system, and G(i, j) be the grayscale of the pixel located at (i, j).

[0168] The horizontal gradient of the pixel is: G_x = (G(i-1, j-1) + 2×G(i-1, j) + G(i-1, j+1)) - (G(i+1, j-1) + 2×G(i+1, j) + G(i+1, j+1)).

[0169] The vertical gradient of the pixel is: G_y = (G(i-1, j-1) + 2×G(i, j-1) + G(i+1, j-1)) - (G(i-1, j+1) + 2×G(i, j+1) + G(i+1, j+1)).

[0170] The corresponding gradient magnitude of the pixel is: G=|G_x|+|G_y|.

[0171] The gradient direction is: θ = arctan(G_x / G_y).

[0172] Step S2140: determine edge pixels in each pixel according to the gradient magnitude and gradient direction of each pixel.

[0173] In an initial image, whether a pixel is an edge pixel can be determined in the following way:

[0174] The gradient amplitude of the pixel is compared with the gradient amplitudes of the two pixels before and after it in the gradient direction. If the gradient amplitude of the pixel is not the largest, the gradient amplitude of the pixel position can be set to 0, and the pixel is not an edge pixel.

[0175] If the gradient magnitude of the pixel exceeds the high gradient threshold, the pixel is an edge pixel. If the initial image is displayed, the pixel is an edge point. If the gradient magnitude of the pixel is lower than the low gradient threshold, the pixel is not an edge pixel. The high gradient threshold is greater than the low gradient threshold.

[0176] If the gradient amplitude of the pixel is between the high gradient threshold and the low gradient threshold, it can be determined whether there is a pixel with a gradient amplitude greater than the high gradient threshold among the 3×3 pixels adjacent to the pixel. If so, the pixel is an edge pixel, otherwise it is not an edge pixel.

[0177] Of course, in other embodiments of the present disclosure, the above filtering may also be performed, that is, step S2120 is not included, and the grayscale in step S2110 is used to perform step S2130.

[0178] In the initial image, the region of edge pixels is in a region with a large color contrast. Therefore, if there are more edge pixels in a region, the color separation phenomenon will be more obvious.

[0179] Step S220: Determine the hue, saturation and brightness of each pixel according to the initial color information.

[0180] Take n=3, and the initial grayscale of a pixel in an initial image frame as (R, G, B) as an example:

[0181] In a frame of initial image, the hue of a pixel satisfies the following relationship:

[0182] h=floor(hs×30), hs≥0; or

[0183] h=hs+180,hs<0;

[0184] h is the hue of a pixel; hs is the reference hue of a pixel; floor means rounding down. Specifically, if hs×30 is an integer, then h=hs. If hs×30 is not an integer, then h is the largest integer less than hs×30.

[0185] The reference hue hs can satisfy the following relationship:

[0186] If the largest initial grayscale of a pixel is the red grayscale R, then hs = (GB) / ((R-min(R, G, B));

[0187] If the largest of the initial grayscales of a pixel is the green grayscale G, then hs = 2 + (BR) / ((G-min (R, G, B));

[0188] If the largest initial grayscale of a pixel is the blue grayscale B, then hs = 4 + (RG) / (B-min (R, G, B));

[0189] min(R, G, B) is the minimum grayscale among the initial grayscales of a pixel.

[0190] The saturation of a pixel satisfies the following relationship:

[0191] S = 1-W / max(R, G, B);

[0192] S is the saturation of the pixel; W is the second largest grayscale among the initial grayscales of a pixel, that is, the second one when the initial grayscales are sorted from large to small; max(R, G, B) is the largest grayscale among the initial grayscales of a pixel;

[0193] The brightness V of a pixel may be the maximum grayscale max(R, G, B) among its initial grayscales; of course, the brightness V may also be the average value or weighted average value of its initial grayscales.

[0194] In the initial image, the degree of color separation is positively correlated with brightness and negatively correlated with saturation. For a region, the more pixels whose brightness is greater than the brightness threshold tv and whose saturation is less than the saturation threshold ts, the more obvious the color separation is in the region.

[0195] Step S230, determining the color characteristics and grayscale characteristics of the color separation pixels and each backlight area BA according to the hue, saturation and brightness of each pixel; the color separation pixels are pixels whose brightness is greater than the brightness threshold and whose saturation is less than the saturation threshold.

[0196] In a frame of initial image, a designated area can be arbitrarily divided, and the color features and grayscale features of the designated area can be calculated. The designated area includes multiple pixels, but the size is not limited. Its range can be the same as the size of the backlight area BA, or the same as or smaller than the backlight area BA.

[0197] In some embodiments of the present disclosure, based on the above embodiment of step S220, the color feature of the designated area satisfies the following relationship:

[0198] H1+H2=C;

[0199] C is the color feature of the specified area; H1 is the average value of the largest T% of the hues of the pixels corresponding to the specified area, that is, the hues of the pixels in the specified area are sorted, and the first T% is selected to calculate the average value, T can be equal to 5, of course, or 3, 7, etc.; H2 is the average value of the hues of the pixels corresponding to the specified area;

[0200] In an initial image, the grayscale features of any specified area satisfy the following relationship:

[0201] Gm+Ga=Gf;

[0202] Gf is the grayscale feature of the specified area; Gm is the maximum grayscale of the grayscales of the pixels corresponding to the specified area; Ga is the average grayscale of the pixels corresponding to the specified area.

[0203] Through the above relationship, the color features and grayscale features of any area can be calculated. For example, the color features and grayscale features of each backlight area BA can be calculated. In addition, the backlight area BA can be further divided, and the backlight area BA can be divided into multiple sub-areas along the first direction X, for example, into two or three sub-areas along the first direction X. At the same time, the backlight area BA can also be divided into multiple sub-areas along the second direction Y, for example, into two or three sub-areas along the second direction Y. The sub-areas divided along the first direction X may overlap with the sub-areas divided along the second direction Y. The first direction X and the second direction Y are directions that intersect each other. For example, the first direction X and the second direction Y are perpendicular, such as Fig. 9 and Fig.10 As shown, the first direction X is the horizontal direction in the figure, and the second direction Y is the vertical direction in the figure.

[0204] Further, according to the color features of the two adjacent designated areas, the color feature difference between the two adjacent designated areas can also be calculated, and the difference can be the absolute value of the difference between the color features of the two sub-areas. Correspondingly, if the designated area is the backlight area BA, the color feature difference between the two adjacent backlight areas BA is the absolute value of the difference between the color features of the two backlight areas BA. If the designated area is a sub-area, the color feature difference between the two adjacent sub-areas is the absolute value of the difference between the color features of the two sub-areas.

[0205] Step S240 , dividing each backlight area BA into at least a first backlight area BA1 and a second backlight area BA2 according to the color characteristics and the grayscale characteristics of the backlight area BA.

[0206] The first backlight area BA1 and the second backlight area BA2 are classifications of the backlight area BA, rather than specific backlight areas BA. In an initial image, for any backlight area BA, the number of edge pixels and color separation pixels in the area corresponding to the backlight area BA can be determined according to the above steps 210 to 230. The more edge pixels, the more likely the color separation phenomenon will occur, and the more color separation pixels, the more obvious the color separation phenomenon will be.

[0207] The number of color separation pixels is divided into two cases: less than the separation threshold and not less than the separation threshold. When the number of color separation pixels is less than the separation threshold, it can be further divided into two cases, that is, the number of edge pixels is greater than the edge threshold or not greater than the edge threshold. For example, the edge threshold can be 70 and the separation threshold can be 200.

[0208] In some embodiments of the present disclosure, a backlight area BA in which the number of color separation pixels is not less than the separation threshold and the number of edge pixels is not less than the edge threshold may be defined as a first backlight area to be divided, and the first backlight area to be divided may be divided into the first backlight area BA1 or the second backlight area BA2 according to the color feature difference and the grayscale feature difference. The following is a detailed description:

[0209] The color feature differences between the first backlight area to be divided and the neighboring backlight area BA adjacent to it can be calculated respectively, and the neighboring backlight area BA with the largest color feature difference can be selected as the target neighboring backlight area BA. At the same time, the grayscale features of each backlight area BA and the sub-areas of each backlight area BA can be calculated. Among them, the field backlight area BA refers to a plurality of backlight areas BA adjacent to the first backlight area to be divided, that is, the first backlight area to be divided is used for the neighboring backlight area BA and there are no other backlight areas BA between them. The number of neighboring backlight areas BA of the first backlight area to be divided can be 8, that is, the first backlight area to be divided and its neighboring backlight area BA are distributed 3×3 along the first direction X and the second direction Y, and the first backlight area to be divided is located at the center.

[0210] If the color feature difference between the first backlight area to be divided and the target neighboring backlight area BA is not greater than the first threshold, that is, greater than or equal to the first threshold, for example, the first threshold may be 6; then the first condition is considered to be met, and the first backlight area to be divided may be divided into the first backlight area BA1. In addition, if the grayscale feature of a neighboring backlight area BA is not greater than the grayscale threshold, the color feature difference between the first backlight area to be divided and the neighboring backlight area BA may be set to 0.

[0211] If the color feature difference between the first backlight area BA1 and the target neighborhood backlight area BA is greater than the first threshold, the color feature difference can be further compared with the second threshold, the second threshold is greater than the first threshold, for example, the second threshold is 50; and when it is less than or equal to the second threshold, that is, not greater than the second threshold, the color feature difference between the first backlight area to be divided and the two adjacent sub-areas in the target neighborhood backlight area BA is further compared, and the grayscale and grayscale threshold of the two sub-areas are compared respectively; if the color feature difference between the first backlight area to be divided and the two adjacent sub-areas in the target neighborhood backlight area BA is not greater than the first threshold, it is deemed to meet the second condition; at the same time, if the grayscale features of the two sub-areas are not greater than the grayscale threshold; it can be deemed to meet the third condition, and the first backlight area to be divided can be divided into the first backlight area BA1.

[0212] In addition, in order to facilitate the determination of the comparison results of the grayscale features and the grayscale threshold, when the grayscale features of the two adjacent sub-areas mentioned above are both not greater than and not greater than the grayscale threshold, they can be recorded separately using the grayscale flag bit. For example, when the grayscale feature is not greater than the grayscale threshold, the grayscale flag bit is set to 0, and when the grayscale feature is greater than the grayscale threshold, the grayscale flag bit is set to 1.

[0213] For example, Fig.10 The first backlight area to be divided and its neighboring backlight area BA are shown. There are 8 neighboring backlight areas BA, which are located at the upper side, lower side, left side and right side, upper left layer, upper right side, lower left side and lower right side. Each backlight area BA is divided into three sub-areas along the first direction X and the second direction Y, including the left, middle and right sub-areas in the first direction X and the upper, middle and lower sub-areas in the second direction Y.

[0214] If the target neighborhood backlight area is the neighborhood backlight area on the upper left side, the sub-area below it is adjacent to the sub-area above the first backlight area to be divided;

[0215] If the target neighborhood backlight area is the neighborhood sub-pixel on the upper side, the sub-area below it is adjacent to the sub-area above the first backlight area to be divided;

[0216] If the target neighborhood backlight area is the neighborhood backlight area on the upper right side, the lowermost sub-area thereof is adjacent to the upper sub-area of ​​the first backlight area to be divided;

[0217] If the target neighborhood backlight area is the neighborhood backlight area on the left, the sub-area on the right side thereof is adjacent to the sub-area on the left side of the first backlight area to be divided;

[0218] If the target neighborhood backlight area is the neighborhood backlight area on the right, the sub-area on the left side thereof is adjacent to the sub-area on the right side of the first backlight area to be divided;

[0219] If the target neighborhood backlight area is the neighborhood backlight area on the lower left side, the sub-area above it is adjacent to the sub-area below the first backlight area to be divided;

[0220] If the target neighboring backlight area is the lower neighboring backlight area, the sub-area above it is adjacent to the sub-area below the first backlight area to be divided;

[0221] If the target neighborhood backlight area is the neighborhood backlight area on the lower right side, the sub-area above it is adjacent to the sub-area below the first backlight area to be divided.

[0222] If the color characteristic difference between the first backlight area BA1 and the target neighborhood backlight area BA is greater than the first threshold, the relationship between the grayscale characteristics of the two adjacent sub-areas in the first backlight area to be divided and the target neighborhood backlight area BA and the grayscale threshold can be further judged. If the grayscale characteristics of the two sub-areas are not greater than the grayscale threshold, the first backlight area to be divided is the first backlight area BA1.

[0223] Based on the above division of the first backlight area to be divided, the first backlight area to be divided that does not meet the first to third conditions is the second backlight area BA2, that is, when the following conditions are met, the first backlight area to be divided is divided into the second backlight area BA2:

[0224] The difference in color characteristics between the first backlight area to be divided and the target neighborhood backlight area BA is greater than the first threshold and greater than the second threshold; or, the difference in color characteristics between the first backlight area to be divided and the target neighborhood backlight area BA is greater than the first threshold, and the difference in color characteristics between the sub-areas adjacent to the first backlight area to be divided and the target neighborhood backlight area BA is greater than the first threshold; or, the difference in color characteristics between the first backlight area to be divided and the target neighborhood backlight area BA is greater than the first threshold, and the grayscale characteristics of the sub-areas adjacent to the first backlight area to be divided and the target neighborhood backlight area BA are not greater than the grayscale threshold.

[0225] In some embodiments of the present disclosure, one backlight area BA is selected from the backlight area BA whose number of edge pixels corresponding to the first backlight area BA1 is less than the edge threshold and whose number of color separation pixels corresponding to the first backlight area BA1 is not less than the separation threshold as the second backlight area to be divided. Therefore, the second backlight area to be divided is divided into the first backlight area BA1 or the second backlight area BA2 according to the color feature difference and the grayscale feature difference. The following is a detailed description:

[0226] The second backlight area to be divided has less edge pixels than the first backlight area to be divided. Comparatively, it is less likely to have color separation, and thus has a greater probability of being divided into the second backlight area BA2.

[0227] If the difference in color characteristics between the second backlight area to be divided and the target neighboring backlight area BA is not greater than the first threshold; and at least one of the neighboring backlight areas BA of the second backlight area to be divided is the first backlight area BA1, then the fourth condition can be regarded as being met, and the second backlight area to be divided can be divided into the first backlight area BA1; if the fourth condition is not met, the second backlight area to be divided is the second backlight area BA2.

[0228] In order to reduce the amount of calculation, it can be set to determine whether only part of the neighboring backlight areas BA are the first backlight area BA1. For example, if the second backlight area to be divided has 8 neighboring backlight areas BA, it is only necessary to determine whether the neighboring backlight area BA on the left or upper left side is the first backlight area BA1.

[0229] In some embodiments of the present disclosure, one backlight area BA in which the number of color-separated pixels is less than the separation threshold can be selected as the third backlight area to be divided; the third backlight area to be divided is less likely to undergo color separation, but if there is a first backlight area BA1 in its neighboring backlight area BA that will undergo color separation, then it is necessary to avoid a large color difference between the third backlight area to be divided and the neighboring backlight area BA. To this end, the third backlight area to be divided can be divided. If the third backlight area to be divided is adjacent to at least one first backlight area BA1, that is, there is a backlight area BA that has been previously divided into the first backlight area BA1 in the neighboring backlight area BA of the third backlight area to be divided, then it can be deemed that the fifth condition is met, and the third backlight area to be divided can be divided into the first backlight area BA1; if the fifth condition is not met, the third backlight area to be divided is the second backlight area BA2.

[0230] In order to reduce the amount of calculation, it can be set to determine whether only part of the neighboring backlight areas BA are the first backlight area BA1. For example, if the third backlight area to be divided has 8 neighboring backlight areas BA, it is only necessary to determine whether the neighboring backlight area BA on the left or upper left side is the first backlight area BA1.

[0231] Step S250 : establishing a first reference color gamut according to the color reflected by the initial color information of the pixel corresponding to the first backlight area BA1 , and determining n first reference primary colors according to the first reference color gamut.

[0232] For a frame of initial image, the initial grayscale of the pixels corresponding to the first backlight area BA1 can be used to establish a first reference color gamut of the first backlight area BA1 in the RGB color space. Each first backlight area BA1 can independently establish a first reference color gamut. According to the first reference color gamut, n first reference primary colors can be determined, which are used as the primary colors of the first backlight area BA1 when displaying n field sequential images. For example, n=3, the first reference color gamut can be a triangle, and the colors represented by the three vertices of the triangle are the three first reference primary colors. Since the first backlight area BA1 is only a backlight area BA, its first reference color gamut must be smaller than the color gamut determined based on the initial grayscale of all pixels of the liquid crystal display panel.

[0233] Step S260: establish a second reference color gamut according to the colors reflected by the initial color information of the pixels corresponding to each second backlight area BA2, and determine n second reference primary colors according to the second reference color gamut.

[0234] For a frame of initial image, each second backlight area BA2 can be taken as a whole, and a second reference color gamut of the second backlight area BA2 can be established in the RGB color space according to the initial grayscale of the pixels corresponding to all the second backlight areas BA2. A second reference color gamut can be established for the second backlight area BA2. According to a reference color gamut, n second reference primary colors can be determined as the primary colors of the second backlight area BA2 when displaying n field sequential images. For example, n=3, the second reference color gamut can be a triangle, and the colors represented by the three vertices of the triangle are the three second reference primary colors. Since the second backlight area BA2 is only a partial backlight area BA, its second reference color gamut must be smaller than the color gamut determined based on the initial grayscale of all pixels of the liquid crystal display panel, but can be larger than the first reference color gamut.

[0235] In step S30, according to the initial color information of each pixel in a frame of initial image, based on the above steps, the actual color tones of different backlight areas BA in each sub-field image can be determined. Specifically, in a sub-field image, the actual color tones of a first backlight area BA1 are a first reference primary color, and the actual color tones of different first backlight areas BA1 may be different, that is, the first reference primary colors may be different, which depends on the initial color information of the pixels corresponding to the different first backlight areas BA1. The actual color tones of each second backlight area BA2 are a second reference primary color, and the actual color tones of different second backlight areas BA2 are the same.

[0236] The first backlight area BA1 and the second backlight area BA2 can be made to emit light according to the actual color tone by controlling the color and number of the light-emitting devices. For example, in a subfield image, the first backlight area BA1 has at least two colors of light-emitting devices that emit light at the same time. By controlling the proportion of light-emitting devices of different colors in the light-emitting devices, the light-emitting color of the first backlight area BA1 as a whole in a subfield image can be controlled to be the first reference primary color, that is, the color of the light-emitting devices that emit light in each backlight area BA in a subfield image after mixing is the light-emitting color of the backlight area BA. The second backlight area BA2 is the same as the first backlight area BA1 in principle of displaying according to the actual color tone, except that the first backlight area BA1 emits light based on the actual color tone respectively, while each second backlight area BA2 emits light based on the same actual color tone in a subfield image.

[0237] Each backlight area BA is controlled to emit light according to the actual color tone, and the pixels are controlled according to the initial gray scale to display n different sub-field images in sequence to obtain the mth frame actual image.

[0238] In addition, while the backlight area BA is emitting light, the control circuit can determine the actual grayscale of each pixel based on the initial color information, and control the deflection degree of the liquid crystal through the pixel electrode and the common electrode to form a subfield image in conjunction with the backlight. n subfield images are mixed to form a frame of actual image.

[0239] In addition, in some embodiments of the present disclosure, for the second backlight area BA2, the primary color determined based on the initial grayscale of all pixels of the liquid crystal display panel can also be used as the actual color tone to emit backlight.

[0240] like Figure 2 As shown, in some embodiments of the present disclosure, the control circuit CU further includes a second working mode, and in the second working mode is configured as follows: if the initial color information of the mth frame initial image is received, the liquid crystal display device is controlled to display n subfield images in sequence based on the initial color information to obtain the mth frame image; m and n are positive integers, and n is greater than or equal to 2. The actual color information of each pixel is its initial color information, and the actual grayscale is its initial grayscale.

[0241] In the second working mode, the light emitting devices of the same color of each backlight area BA emit light, the hue of each backlight area BA is the same, and the primary colors applicable to each backlight area BA can be determined based on the color gamut determined based on the initial color information of all pixels. In other words, in the second working mode, the process of classifying the first backlight area BA1 and the second backlight area BA2 and re-determining the primary colors described above may not be performed.

[0242] The first working mode and the second working mode mentioned above can be started when a start signal is received. For example, an image of the user's eyeball can be collected by an image acquisition device, and the moving speed of the eyeball can be determined by an image processing device based on the image of the eyeball. When the moving speed reaches the speed threshold, the color separation phenomenon is more obvious. At this time, the control circuit CU can be placed in the first working mode to eliminate the color separation. When the moving speed does not reach the speed threshold, the color separation phenomenon may not be obvious. At this time, the control circuit CU can be placed in the second working mode to improve the operating efficiency.

[0243] It should be noted that, although the steps of the image display method in the present disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0244] An embodiment of the present disclosure provides an electronic device, which may include a liquid crystal display device. The structure of the liquid crystal display device may be the liquid crystal display device of any embodiment described above, which will not be described in detail herein.

[0245] like Figure 7 As shown, the electronic device further includes an image acquisition device CAM and an image processing device CP, wherein:

[0246] The image acquisition device CAM may include one or more cameras, and of course, other devices that can acquire image information such as human body or object feature information may also be used. The image acquisition device CAM can acquire images of the user's eyeballs in real time.

[0247] The image processing device CP can be connected to the image acquisition device CAM, which can determine the movement speed of the eyeball according to the image of the eyeball, and when the movement speed reaches the speed threshold, it 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, no start signal is output, and the control circuit CU is in the second working mode.

[0248] The image processing device CP can recognize the pupil center based on the image of the eyeball, and determine the movement speed of the eyeball based on the change in the position of the pupil center.

[0249] In some embodiments, the electronic device may further include an infrared detection device, which can locate the user's corneal center through infrared light. 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 true line of sight direction can be obtained according to the angle between the optical axis and the visual axis. In addition, a thermal mirror may be included to reduce tracking errors without affecting the display of the image; or an optical waveguide may be used to transmit infrared light and eye images.

[0250] In addition, eye tracking may also be achieved through other methods, which are not specifically limited here.

[0251] The electronic device disclosed in the present invention may be a mobile phone, a television, a tablet computer, or a head-mounted display device such as smart glasses, which are not listed one by one here.

[0252] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be 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, characterized in that: The device comprises a liquid crystal display panel and a control circuit, wherein the liquid crystal display panel comprises a liquid crystal display substrate and a backlight module, wherein the liquid crystal display substrate comprises a plurality of pixels, and the backlight module comprises a plurality of backlight areas, and each of the backlight areas comprises light-emitting devices of n colors; The control circuit includes a first working mode, and in the first working mode is configured to: receive an m-th frame of initial image, control each of the liquid crystal display panels to sequentially display n different sub-field images, so as to obtain the m-th frame of actual image; m and n are positive integers, n≥2; the initial image includes initial color information of each of the pixels; the initial color information of the pixel includes initial grayscales under n tones; In one of the sub-field images, the backlight area includes a first backlight area and a plurality of second backlight areas; the first backlight area and the second backlight area emit light of different tones; and the second backlight areas emit light of the same tones.

2. The liquid crystal display device according to claim 1, wherein: In one of the sub-field images, the backlight area includes a plurality of first backlight areas; at least two of the first backlight areas emit light of different tones.

3. The liquid crystal display device according to claim 2, characterized in that: In a frame of actual image, the color reflected by the initial color information of the pixel corresponding to the first backlight area is located in a first reference color gamut determined based on n first reference primary colors; The color reflected by the initial color information of the pixels corresponding to each of the second backlight areas is in a second reference color gamut determined based on n second reference primary colors; In one of the sub-field images, the color tone of the first backlight area is the first reference primary color; and the color tone of the second backlight area is the second reference primary color.

4. The liquid crystal display device according to claim 3, characterized in that: Based on the initial color information of each pixel in a frame of initial image, the pixels include edge pixels and color separation pixels; the color separation pixels are pixels whose brightness is greater than a brightness threshold and whose saturation is less than a saturation threshold.

5. The liquid crystal display device according to claim 4, characterized in that: Taking one of the backlight areas as the center, a plurality of the backlight areas adjacent to the backlight area are neighboring backlight areas of the backlight area at the center; one of the neighboring backlight areas of the first backlight area is a target neighboring backlight area; In a frame of initial image, the color feature difference between the first backlight area and the target neighborhood backlight area is not less than the color feature difference between the first backlight area and other neighborhood backlight areas; the color feature difference of the backlight area is determined based on the color feature determined by the hue of each pixel corresponding to the backlight area.

6. The liquid crystal display device according to claim 5, characterized in that: In an initial image, the color features of any specified area satisfy the following relationship: H1+H2=C; C is the color feature of the designated area; H1 is the average value of the largest T% of the hues of the pixels corresponding to the designated area; H2 is the average value of the hues of the pixels corresponding to the designated area; The color characteristic difference between two adjacent backlight areas is the absolute value of the difference between the color characteristics of the two backlight areas.

7. The liquid crystal display device according to claim 6, characterized in that: n=3, the initial grayscale of the pixel in an initial image frame is (R, G, B), R is the grayscale of red, G is the grayscale of green, and B is the grayscale of blue; In a frame of the initial image, the hue of a pixel corresponding to a specified area satisfies the following relationship: h=floor(hs×30), hs≥0; or h=hs+180,hs<0; h is the hue of the pixel; hs is the reference hue of the pixel; The reference hue satisfies the following relationship: If the largest of the initial gray levels of a pixel is the red gray level R; then hs = (GB) / ((R-min(R, G, B)); If the largest of the initial grayscales of a pixel is the green grayscale G, then hs=2+(BR) / ((G-min(R, G, B)); If the largest of the initial grayscales of a pixel is the blue grayscale B, then hs=4+(RG) / (B-min(R, G, B)); min(R, G, B) is the minimum grayscale among the initial grayscales of the pixel.

8. The liquid crystal display device according to claim 7, characterized in that: Each of the backlight areas is divided into a plurality of sub-areas along a first direction and is divided into a plurality of sub-areas along a second direction; the first direction intersects with the second direction; In an initial image, the grayscale features of any specified area satisfy the following relationship: Gm+Ga=Gf; Gf is the grayscale feature of the designated area; Gm is the maximum grayscale of the grayscales of the pixels corresponding to the designated area; Ga is the average grayscale of the pixels corresponding to the designated area; In an initial image frame, the grayscale of a pixel and its initial grayscale satisfy the following relationship: G = k1 × R + k2 × G + k3 × B; k1, k2 and k3 are all positive numbers; In a frame of initial image, the number of edge pixels corresponding to the first backlight area is not less than an edge threshold, and the number of color separation pixels corresponding to the first backlight area is not less than a separation threshold; the first backlight area satisfies at least one of the following first condition, second condition and third condition: The first condition is that the difference in color characteristics between the first backlight area and the target neighborhood backlight area is not greater than a first threshold; The second condition is: the color feature difference between the first backlight area and the target neighborhood backlight area is greater than the first threshold and not greater than the second threshold; the color feature difference between the first backlight area and the adjacent sub-area in the target neighborhood backlight area is not greater than the first threshold; The third condition is: the difference in color characteristics between the first backlight area and the target neighborhood backlight area is greater than the first threshold, and the grayscale characteristic of at least one of the adjacent sub-areas between the first backlight area and the target neighborhood backlight area is not greater than the grayscale threshold; The second backlight area does not satisfy the first condition, the second condition, and the third condition.

9. The liquid crystal display device according to claim 8, characterized in that: In an initial image frame, the number of edge pixels corresponding to the first backlight area is less than the edge threshold, and the number of color separation pixels corresponding to the first backlight area is not less than the separation threshold; the first backlight area satisfies the fourth condition: The fourth condition is that: the color feature difference between the first backlight area and the target neighborhood backlight area is not greater than a first threshold; and the first backlight area is adjacent to at least one of the first backlight areas; The second backlight area does not satisfy the fourth condition.

10. The liquid crystal display device according to claim 8, characterized in that: The number of color separation pixels corresponding to the first backlight area is less than the separation threshold; and the first backlight area satisfies the fifth condition: The fifth condition is: the first backlight area is adjacent to at least one of the first backlight areas; The second backlight area does not satisfy the fifth condition.

11. The liquid crystal display device according to any one of claims 1 to 10, characterized in that: The control circuit further includes a second working mode, and in the second working mode is configured to: receive the mth frame initial image, and control the liquid crystal display device to display n sub-field images in sequence according to the initial color information of each pixel to obtain the mth frame image; In a subfield image of the second working mode, light emitting devices of the same color in each backlight area emit light.

12. The liquid crystal display device according to any one of claims 1 to 10, characterized in that: The liquid crystal display substrate comprises: An array substrate and a counter substrate arranged opposite to each other; A liquid crystal layer, disposed between the array substrate and the counter substrate; The control circuit is connected to the array substrate and the backlight module.

13. An image display method, characterized in that: Used in a liquid crystal display device, the liquid crystal display device comprises a liquid crystal display panel and a control circuit, the liquid crystal display panel comprises a liquid crystal display substrate and a backlight module, the liquid crystal display substrate comprises a plurality of pixels, the backlight module comprises a plurality of backlight areas, each of the backlight areas comprises light emitting devices of n colors; The image display method comprises: In the first working mode: Receive an m-th frame of initial image, wherein the initial image includes initial color information of each pixel; the initial color information of each pixel includes initial grayscales under n tones; m and n are positive integers, and n≥2; Determine the actual color tone of each of the backlight areas under n sub-field images according to the initial color information; Controlling each of the backlight areas to emit light according to the actual color tone, and controlling the pixels according to the initial grayscale, and sequentially displaying n different subfield images to obtain the mth frame actual image; In one of the sub-field images, the backlight area includes a first backlight area and a plurality of second backlight areas; the actual hues of light emitted by the first backlight area and the second backlight area are different; and the actual hues of light emitted by each of the second backlight areas are the same.

14. The image display method according to claim 13, characterized in that: Determine the actual color tone of each of the backlight areas under n sub-field images according to the initial color information; include: Determine edge pixels in the initial image according to the initial color information; Determine the hue, saturation and brightness of each pixel according to the initial color information; Determine the color separation pixel and the color characteristics and grayscale characteristics of each of the backlight areas according to the hue, saturation and brightness of each of the pixels; the color separation pixel is a pixel whose brightness is greater than a brightness threshold and whose saturation is less than a saturation threshold; Dividing each of the backlight areas into at least a first backlight area and a second backlight area according to the color characteristics and the grayscale characteristics of the backlight area; Establishing a first reference color gamut according to the color reflected by the initial color information of the pixel corresponding to the first backlight area, and determining n first reference primary colors according to the first reference color gamut; Establishing a second reference color gamut according to the color reflected by the initial color information of the pixels corresponding to each of the second backlight areas, and determining n second reference primary colors according to the second reference color gamut; Controlling each of the backlight areas to emit light according to the actual color tone; comprising: In one of the sub-field images, the actual color tone of the light emitted from the first backlight area is controlled to be the first reference primary color; and the actual color tone of the light emitted from the second backlight area is controlled to be the second reference primary color.

15. The image display method according to claim 13, characterized in that: Determining edge pixels in the initial image according to the initial color information; comprising: Gray-scaling the initial image to obtain the gray scale of each pixel; Determine the gradient magnitude and gradient direction of each pixel according to the grayscale of each pixel; An edge pixel among the pixels is determined according to the gradient magnitude and the gradient direction of the pixels.

16. The image display method according to claim 14, characterized in that: n=3, the initial grayscale of the pixel in an initial image frame is (R, G, B), R is the grayscale of red, G is the grayscale of green, and B is the grayscale of blue; In a frame of initial image, the hue of a pixel satisfies the following relationship: h=floor(hs×30), hs≥0; or h=hs+180,hs<0; h is the hue of the pixel; hs is the reference hue of the pixel; The reference hue satisfies the following relationship: If the largest of the initial gray levels of a pixel is the red gray level R; then hs = (GB) / ((R-min(R, G, B)); If the largest of the initial grayscales of a pixel is the green grayscale G, then hs=2+(BR) / ((G-min(R, G, B)); If the largest of the initial grayscales of a pixel is the blue grayscale B, then hs=4+(RG) / (B-min(R, G, B)); min(R, G, B) is the minimum grayscale among the initial grayscales of the pixel; The saturation of the pixel satisfies the following relationship: S = 1-W / max(R, G, B); S is the saturation of the pixel; W is the second largest grayscale among the initial grayscales of the pixel; max(R, G, B) is the largest grayscale among the initial grayscales of the pixel; The brightness of a pixel is the maximum gray level among its initial gray levels.

17. The image display method according to claim 16, characterized in that: The color separation pixel is a pixel whose brightness is less than a brightness threshold and whose saturation is greater than a saturation threshold; In an initial image, the color features of any specified area satisfy the following relationship: H1+H2=C; C is the color feature of the designated area; H1 is the average value of the largest T% of the hues of the pixels corresponding to the designated area; H2 is the average value of the hues of the pixels corresponding to the designated area; The color characteristic difference between two adjacent backlight areas is the absolute value of the difference between the color characteristics of the two backlight areas; In an initial image, the grayscale features of any specified area satisfy the following relationship: Gm+Ga=Gf; Gf is the grayscale feature of the designated area; Gm is the maximum grayscale of the grayscales of the pixels corresponding to the designated area; Ga is the average grayscale of the pixels corresponding to the designated area; In an initial image frame, the grayscale of a pixel and its initial grayscale satisfy the following relationship: G = k1 × R + k2 × G + k3 × B; k1, k2 and k3 are all positive numbers.

18. The image display method according to claim 17, characterized in that: Dividing each of the backlight areas into at least a first backlight area and a second backlight area according to the color characteristics and grayscale characteristics of the backlight area; comprising: Dividing each of the backlight areas into a plurality of sub-areas along a first direction and into a plurality of sub-areas along a second direction; the first direction intersects the second direction; Selecting one of the backlight areas in which the number of edge pixels is not less than the edge threshold and the number of color separation pixels is not less than the separation threshold as a first backlight area to be divided; Taking the first backlight area to be divided as the center, respectively determining the color feature difference and grayscale feature difference between the first backlight area to be divided and its adjacent neighborhood backlight area; and taking the neighborhood backlight area with the largest color feature difference as the target neighborhood backlight area; Determine the difference in color characteristics between the first backlight area to be divided and the adjacent sub-areas in the target neighborhood backlight area; If the color feature difference between the first backlight area to be divided and the target neighborhood backlight area is not greater than a first threshold, the first condition is met, and the first backlight area to be divided is the first backlight area; If the color feature difference between the first backlight area and the target neighborhood backlight area is greater than the first threshold and not greater than the second threshold; the color feature difference between the first backlight area to be divided and the adjacent sub-areas in the target neighborhood backlight area is not greater than the first threshold; then the second condition is met and the first backlight area to be divided is the first backlight area; If the difference in color characteristics between the first backlight area and the target neighborhood backlight area is greater than the first threshold, and the grayscale characteristic of at least one of the adjacent sub-areas between the first backlight area and the target neighborhood backlight area is not greater than the grayscale threshold, then the third condition is met and the first backlight area to be divided is the first backlight area; If the first condition, the second condition and the third condition are not satisfied, the first backlight area to be divided is the second backlight area.

19. The image display method according to claim 18, characterized in that: According to the color characteristics and grayscale characteristics of the backlight area, each of the backlight areas is at least divided into a first backlight area and a second backlight area; and further comprising: Select one from the backlight areas where the number of edge pixels corresponding to the first backlight area is less than the edge threshold and the number of color separation pixels corresponding to the first backlight area is not less than the separation threshold as the second backlight area to be divided; If the difference in color characteristics between the second backlight area to be divided and the target neighboring backlight area is not greater than a first threshold; and at least one of the neighboring backlight areas of the second backlight area to be divided is the first backlight area, then the fourth condition is met and the second backlight area to be divided is the first backlight area; if the fourth condition is not met, then the second backlight area to be divided is the second backlight area.

20. The image display method according to claim 18, characterized in that: According to the color characteristics and grayscale characteristics of the backlight area, each of the backlight areas is at least divided into a first backlight area and a second backlight area; and further comprising: Selecting one from the backlight areas where the number of color separation pixels is less than the separation threshold as a third backlight area to be divided; If the third backlight area to be divided is adjacent to at least one of the first backlight areas, the fifth condition is met and the third backlight area to be divided is the first backlight area; if the fifth condition is not met, the third backlight area to be divided is the second backlight area.

21. An electronic device, characterized in that: A liquid crystal display device comprising any one of claims 1-12.

Images