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

Abstract

A liquid crystal display device, an image display method, and an electronic device. The liquid crystal display device comprises a liquid crystal display panel and a control circuit (CU). The liquid crystal display panel comprises a liquid crystal display substrate (PNL) and a backlight module (BLU). The backlight module (BLU) comprises a plurality of backlight areas, and each backlight area comprises light-emitting devices of n colors. In a first working mode, the control circuit (CU) is configured to: receive initial display information of pixels of an m-th image frame, and control, according to actual brightness of the backlight areas determined on the basis of the initial display information and according to compensation parameters of the pixels, the backlight areas and the pixels to display n sub-field images of different tones to obtain the m-th image frame, wherein m and n are positive integers, and n≥2; the initial display information of each pixel comprises initial grayscales in n tones; and in a sub-field image, the light-emitting devices of the same color of the backlight areas emit light, and the actual brightness of the backlight areas is greater than initial backlight brightness determined on the basis of the initial display information.

Description

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

[0001] Cross-references

[0002] This disclosure claims priority to Chinese patent application number 202310636765.3 filed on May 31, 2023, entitled “LIQUID CRYSTAL DISPLAY DEVICE, IMAGE DISPLAY METHOD AND ELECTRONIC EQUIPMENT”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] 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

[0004] Display panels are an indispensable part of electronic devices such as televisions and mobile phones, among which liquid crystal display panels are widely used. However, existing liquid crystal display panels suffer from high light loss and high energy consumption during the light output process.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute prior art known to ordinary technicians in the field.

[0006] Summary of the Invention

[0007] The purpose of the present disclosure is to overcome the above-mentioned deficiencies of the prior art and to provide a liquid crystal display device, an image display method and an electronic device.

[0008] According to one aspect of the present disclosure, a liquid crystal display device is provided, comprising a liquid crystal display panel and a control circuit, 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 sub-regions, each of the backlight sub-regions comprising light-emitting devices of n colors;

[0009] The control circuit includes a first operating mode, and in the first operating mode is configured to: receive initial display information of each pixel of the m-th frame image, and control each backlight sub-region and the pixel to sequentially display n sub-field images of different tones according to actual brightness of each backlight sub-region determined based on the initial display information and compensation parameters of each pixel, so as to obtain the m-th frame image; m and n are positive integers, n ≥ 2; the initial display information of each pixel includes initial grayscales at the n tones;

[0010] Under one of the subfield images, light devices of the same color in each of the backlight partitions emit light, and actual brightness of the backlight partition is greater than initial backlight brightness determined based on the initial display information.

[0011] In an exemplary embodiment of the present disclosure, the liquid crystal display panel can be divided into a plurality of filtering areas by a filtering template, one of the filtering areas includes a plurality of the backlight partitions, and one of the backlight partitions within the filtering area is a target backlight partition;

[0012] Under the sub-field image:

[0013] The actual brightness of the target backlight partition is an average value of the expanded backlight brightness determined based on the initial backlight brightness for each backlight partition within the same filtering area;

[0014] The expanded backlight brightness of the backlight partition is the product of the initial backlight brightness of the backlight partition and an expansion coefficient.

[0015] In an exemplary embodiment of the present disclosure, under one of the subfield images:

[0016] The initial backlight brightness is one of the initial grayscales of the pixel with the maximum pixel brightness among the pixels corresponding to the backlight partitions;

[0017] The pixel brightness of the pixel is obtained by gray-scaling the initial gray level of the initial display information.

[0018] In an exemplary embodiment of the present disclosure, n=3, the hues include red, green, and blue;

[0019] In the m-th frame image, the pixel brightness of a pixel and its initial grayscale satisfy the following relationship: Ls=k1×(R / 255) 2.2 +k2×(G / 255) 2.2 +k3×(B / 255) 2.2 ;

[0020] Ls is the pixel brightness, R is the initial grayscale of red, G is the initial grayscale of blue, and B is the initial grayscale of blue.

[0021] In an exemplary embodiment of the present disclosure, the pixel with the largest pixel brightness among the pixels corresponding to the backlight partition is the target pixel of the backlight partition; the initial backlight brightness of the backlight partition is the largest one among the initial grayscales of the initial display information of the target pixel.

[0022] In an exemplary embodiment of the present disclosure, the expansion coefficient is negatively correlated with the maximum initial backlight brightness of the target pixel.

[0023] In an exemplary embodiment of the present disclosure, the control circuit further includes a second operating mode, and in the second operating mode is configured to: receive the initial display information of the m-th frame image, and control the liquid crystal display device to sequentially display n subfield images according to the actual brightness of each backlight subarea determined based on the initial display information and the compensation parameter of each pixel, so as to obtain the m-th frame image;

[0024] In the subfield image of the second operating mode, the light devices of the same color in each backlight partition emit light, and the actual brightness of the backlight partition is the same as the initial backlight brightness determined based on the initial grayscale.

[0025] In an exemplary embodiment of the present disclosure, the liquid crystal display substrate includes:

[0026] An array substrate and a counter substrate arranged opposite to each other;

[0027] a liquid crystal layer, disposed between the array substrate and the counter substrate;

[0028] The control circuit is connected to the array substrate and the backlight module.

[0029] 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 includes a liquid crystal display panel and a control circuit, wherein the liquid crystal display panel includes a plurality of pixels. The image display method includes:

[0030] In the first working mode:

[0031] receiving initial display information of each pixel of the m-th frame image; the initial display information of each pixel includes initial grayscales of n different tones; m and n are positive integers, and n≥2;

[0032] determining, according to the initial display information, an actual brightness of each of the backlight subareas at n tones and a compensation parameter of each of the pixels;

[0033] According to the actual brightness of each backlight partition and the compensation parameter of each pixel, controlling each backlight partition and the pixel to sequentially display n sub-field images of different tones to obtain the m-th frame image;

[0034] Under one of the subfield images, light devices of the same color in each of the backlight partitions emit light, and actual brightness of the backlight partition is greater than initial backlight brightness determined based on the initial display information.

[0035] In an exemplary embodiment of the present disclosure, determining the actual brightness of each backlight subarea at n tones and the compensation parameter of each pixel according to the initial display information includes:

[0036] determining the initial backlight brightness of each backlight subarea at n tones according to the initial display information;

[0037] amplifying the initial backlight brightness to obtain amplified backlight brightness;

[0038] determining the actual brightness and the equivalent backlight of each pixel according to the amplified backlight brightness;

[0039] A compensation parameter of each pixel is determined according to the equivalent backlight.

[0040] In an exemplary embodiment of the present disclosure, n=3, the hues include red, green, and blue;

[0041] Determining the initial backlight brightness of each backlight subarea at n tones according to the initial display information; comprising:

[0042] The pixel brightness is determined according to the initial display information and the grayscale formula, wherein the grayscale formula is: Ls = 0.3 × (R / 255) 2.2 +0.6×(G / 255) 2.2 +0.1×(B / 255) 2.2 ;

[0043] Ls is the pixel brightness, R is the initial grayscale of red, G is the initial grayscale of blue, and B is the initial grayscale of blue;

[0044] The pixel with the largest brightness among the pixels corresponding to a backlight partition is used as a target pixel, and the initial backlight brightness of a backlight partition at a tone is the initial grayscale of the target pixel at the same tone.

[0045] In an exemplary embodiment of the present disclosure, amplifying the initial backlight brightness comprises:

[0046] determining an expansion coefficient according to a maximum value of the initial backlight brightness under the n tones and a preset corresponding relationship;

[0047] The product of the initial backlight brightness and the expansion coefficient at each of the hues is calculated.

[0048] In an exemplary embodiment of the present disclosure, determining the actual brightness and the equivalent backlight of each pixel according to the amplified backlight brightness includes:

[0049] All the backlight partitions are scanned using a filtering template, and each backlight partition is filtered to obtain the actual brightness of each backlight partition; the range of the filtering template covers multiple backlight partitions.

[0050] In an exemplary embodiment of the present disclosure, one of the backlight partitions within the coverage range of the filtering template is a target backlight partition;

[0051] Under the sub-field image:

[0052] The actual brightness of the target backlight partition is an average value of the expanded backlight brightnesses determined based on the initial backlight brightness for each backlight partition within the same filtering template.

[0053] In an exemplary embodiment of the present disclosure, determining the actual brightness and the equivalent backlight of each pixel according to the amplified backlight brightness includes:

[0054] The equivalent backlight of each pixel corresponding to the backlight partition is determined according to the actual brightness, the position of the light-emitting device in the backlight partition, and the point spread curve.

[0055] According to one aspect of the present disclosure, an electronic device is provided, comprising any one of the above-mentioned liquid crystal display devices.

[0056] The liquid crystal display device, image display method, and electronic device disclosed herein 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 light extraction efficiency and eliminate the need to set sub-pixels of different colors, thereby improving resolution.

[0057] In addition, in the first operating mode, under one of the subfield images, the light devices of the same color in each of the backlight partitions emit light, and the actual brightness of the backlight partitions is greater than the initial backlight brightness determined based on the initial display information, which can avoid overflow of pixel compensation parameters and prevent the actual displayed brightness of the pixel from being lower than the original brightness, thereby weakening the color separation phenomenon by increasing the brightness.

[0058] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0060] FIG1 is a schematic structural diagram of an embodiment of a liquid crystal display device disclosed herein.

[0061] FIG2 is a circuit diagram of an embodiment of a liquid crystal display device disclosed herein.

[0062] FIG3 is a partial schematic diagram of the mth frame image of the liquid crystal display device of the present disclosure in the first working mode.

[0063] 4 to 6 are principle diagrams of three subfield images of the m-th frame image in FIG. 3 .

[0064] FIG7 is a schematic diagram of an embodiment of an electronic device disclosed herein.

[0065] FIG8 is a flowchart of the image processing method disclosed herein.

[0066] FIG. 9 is a schematic diagram showing the relationship between the maximum initial backlight brightness and the amplification factor in the liquid crystal display device of the present disclosure. DETAILED DESCRIPTION

[0067] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent identical or similar structures, and thus their detailed descriptions will be omitted. Furthermore, the figures are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0068] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express open-ended inclusion and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used only as labels and are not intended to limit the quantity of their objects.

[0069] The present disclosure provides a liquid crystal display device, as shown in FIG1 and FIG2 . The liquid crystal display device may include a liquid crystal display panel and a control circuit CU, wherein:

[0070] A liquid crystal display panel may include a liquid crystal display substrate (PNL) and a backlight unit (BLU), and may have a plurality of pixels arranged in an array. A pixel is the smallest display unit. The liquid crystal display substrate (PNL) may include an array substrate (TB), an opposing substrate (FB), and a liquid crystal layer (LL) disposed between the array substrate (TB) and the opposing substrate (FB).

[0071] The liquid crystal display substrate PNL also includes pixel electrodes and common electrodes. The pixel electrodes can be provided on the array substrate TB, and the common electrodes can be provided on the array substrate TB or the counter substrate FB. Each pixel includes one pixel electrode. The array substrate TB includes a drive circuit. The control circuit CU can be provided on the array substrate TB and can control the voltage between the pixel electrodes and the common electrode through the drive circuit, thereby controlling the degree of deflection of the liquid crystal molecules in the liquid crystal layer LL, and thus controlling the transmittance of each pixel to light, thereby adjusting the grayscale of each pixel.

[0072] 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 toward the array substrate TB under the control of the control circuit CU.

[0073] In some embodiments, the counter substrate (FB) may include a color filter layer comprising multiple filter sections. Each pixel may include one filter section. Through the filtering effect of the filter sections, each pixel emits monochromatic light, and different pixels can emit different colors. However, the color filter layer causes significant light loss, reducing the brightness of the LCD device without increasing the power of the backlight unit (BLU). Increasing the brightness requires increasing the power of the backlight unit (BLU), resulting in increased power consumption.

[0074] In order to improve the light extraction efficiency without increasing power consumption, in some embodiments, the counter substrate FB may not be provided with a color filter layer to reduce light loss, which is conducive to improving the light extraction efficiency. In order to achieve color display, the backlight module BLU can include n light-emitting devices of different colors. The number of light-emitting devices of the same color is not specifically limited here and can be one or more. 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 to display the image, and the pixel can control the deflection state of the liquid crystal, thereby controlling the grayscale of the pixel. The image display is achieved through the cooperation of the backlight module BLU and the pixel.

[0075] On this basis, field sequential display can be used when displaying images. For example, n subfield images are displayed sequentially within a frame. Each subfield image is a monochrome image. In each subfield image, the grayscale of different pixels can be different, and the grayscale of the same pixel in different subfield images can be different. The backlight module BLU emits the same luminous color when displaying the same subfield image, and emits different luminous colors when displaying different subfield images. For example, when displaying each subfield image, only one color of light-emitting device in the backlight module BLU emits light, so that each subfield image has only one hue, that is, one color. In this way, based on the phenomenon of visual persistence, a frame of image can be obtained.

[0076] Furthermore, the backlight module (BLU) can be divided into multiple backlight zones, each with multiple light-emitting devices. Light-emitting devices of the same color within the same backlight zone can emit light simultaneously and at the same brightness. Light-emitting devices in different backlight zones can be independently controlled, and their brightness can be different, thus achieving local dimming. A backlight zone can correspond to multiple pixels, that is, the orthographic projections of multiple pixels on the backlight module are located within a backlight zone, and the same backlight zone can have light-emitting devices of n colors.

[0077] As shown in FIG2 , in some embodiments of the present disclosure, the control circuit CU may be configured to execute one or more operating modes, including a first operating mode. In the first operating mode:

[0078] The control circuit CU is configured to receive initial display information for each pixel of the mth frame image, control the brightness of each backlight sub-zone and the grayscale of the pixel based on the initial display information, and sequentially display n sub-field images of different tones to obtain the mth frame image. m and n are positive integers, and n ≥ 2.

[0079] The initial display information for each pixel may include initial grayscales in n tones. For a pixel in a frame of image, the n tones can be displayed sequentially, achieving temporal color mixing, so that the pixel presents the desired color. For example, if n = 3, and the three tones are red, green, and blue, the initial display information for each pixel in the mth frame of image may include an initial grayscale for red, an initial grayscale for green, and an initial grayscale for blue.

[0080] Figures 4 through 6 illustrate three subfield images. In different subfield images, the illuminated pixels P form multiple stripe patterns. The illuminated pixels in different subfield images can differ or overlap, meaning the same pixel can illuminate in each subfield image. The three subfield images form the mth frame image shown in Figure 3. It should be noted that Figure 3 is intended only to illustrate the principle of color mixing and the resulting visual effect of the three subfield images and does not limit the specific patterns of the subfield images.

[0081] In one embodiment, the backlight unit (BLU) may include three types of light-emitting devices, each capable of emitting red, green, and blue light. A single frame of image can be divided into three sub-field images, each with a red, green, and blue hue. These three sub-field images are displayed sequentially to visually form a single frame of image.

[0082] As shown in Figure 2 , the control circuit CU can be connected to the array substrate TB and the backlight module BLU to control the backlight module BLU's light emission and the degree of liquid crystal deflection, that is, to control the color and grayscale of each pixel. The control circuit CU may include a timing controller, a gate drive circuit, a source drive circuit, a backlight control circuit, etc., and its structure is not particularly limited here.

[0083] The inventors discovered that when field sequential display is used, since a frame of image needs to be mixed from multiple sub-field images that are not displayed at the same time, when the user blinks, glances, or moves the target in the picture, they may observe red, green, and blue tones in the picture at the same time, which is a color separation phenomenon.

[0084] The inventors have discovered through research that the color separation phenomenon can be improved by designing the brightness of each backlight partition of the backlight module BLU and the compensation parameters for the pixels. The following is an exemplary explanation:

[0085] In a first operating mode, the control circuit CU may receive initial display information for an mth frame of display image, where m and n are positive integers and n ≥ 2. The initial display information for each pixel includes initial grayscales at n tones. Based on the actual brightness of each backlight sub-zone determined based on the initial display information and compensation parameters for each pixel, the control circuit CU may control each backlight sub-zone and pixel to sequentially display n sub-field images of different tones, thereby obtaining the mth frame of image. In each sub-field image, light devices of the same color in each backlight sub-zone emit light, and the actual brightness of each backlight sub-zone is greater than the initial backlight brightness determined based on the initial display information. The backlight sub-zone may be controlled to emit light at its actual brightness, and the grayscale of the pixel may be controlled using the compensation parameters, thereby obtaining n field-sequential images. A single field-sequential image is displayed, with light devices of the same color in each backlight sub-zone emitting light.

[0086] The actual brightness of the backlight partition is greater than the initial backlight brightness determined based on the initial display information, which can avoid overflow of the compensation parameter of the pixel and prevent the actual displayed brightness of the pixel from being lower than the original brightness, thereby weakening the color separation phenomenon by increasing the brightness.

[0087] The method of determining the actual brightness and compensation parameters based on the initial display information is described in detail:

[0088] First, the initial backlight brightness can be determined according to the initial display information, and then the expanded backlight brightness can be determined according to the initial backlight brightness. Then, the actual backlight brightness can be determined according to the expanded backlight brightness. The following details:

[0089] After receiving the initial display information of the mth frame, the initial backlight brightness of each backlight partition under n tones can be determined according to the initial display information, that is, in the same frame image, the initial backlight brightness of a pixel is n, for example, n=3, and the tones include red, green and blue, then the initial backlight brightness may include the initial backlight brightness of red, the backlight brightness of green and the backlight brightness of blue.

[0090] In some embodiments of the present disclosure, the initial grayscale of the initial display information of a pixel can be grayscaled according to a grayscale formula to obtain the pixel brightness of the pixel, and the initial display information can be converted to the brightness domain. For example, the grayscale formula is: Ls = k1 × (R / 255) 2.2 +k2×(G / 255) 2.2 +k3×(B / 255) 2.2 ;

[0091] Ls is the pixel brightness, R is the initial grayscale of red, G is the initial grayscale of blue, and B is the initial grayscale of blue. k1 can be 0.3, k2 can be 0.6, and k3 can be 0.1. 2.2 is the gamma value.

[0092] The initial backlight brightness is positively correlated with the initial grayscale. Therefore, when the maximum initial backlight brightness is selected, the maximum initial grayscale is actually selected.

[0093] The initial backlight brightness of red is (R / 255) 2.2 , the same goes for blue and green or other colors.

[0094] The pixel with the largest brightness among the pixels corresponding to a backlight partition can be used as the target pixel. The initial backlight brightness of a backlight partition at a certain tone can be represented by the initial grayscale of the target pixel at the certain tone. That is to say, for a backlight partition, in a field sequence image, the light-emitting devices of the same color emit light, and the initial backlight brightness of the backlight partition at the certain tone can be represented by the initial grayscale of the target pixel at the certain tone. The proportional relationship between the initial grayscales of different colors will not change. Compared with the method of determining the initial backlight brightness in the nonlinear domain, this method is helpful in preventing color distortion.

[0095] Since the number of light-emitting devices in a backlight partition is less than the number of pixels corresponding to the backlight partition, and a light-emitting device is facing a pixel in a direction perpendicular to the liquid crystal display substrate, and some pixels are located facing any light-emitting device, the light emitted by the light-emitting device is irradiated at a certain angle to the pixels that are not facing. Compared with the brightness of the light received by the facing pixels, the brightness of the light obtained by the facing pixels is reduced, that is, there is attenuation. In order to avoid insufficient brightness caused by the attenuation, the initial backlight brightness can be amplified after obtaining the initial backlight brightness to obtain the amplified backlight brightness, so that the brightness obtained by the above-mentioned non-facing pixels is increased. For example:

[0096] For the initial display information of the mth frame image, for each initial grayscale of the target pixel, the maximum value of the initial backlight brightness under n tones can be determined, and the expansion coefficient can be determined according to the preset corresponding relationship; when calculating the product of the initial backlight brightness under each tones and the expansion coefficient, the amplified backlight brightness is obtained, that is, each initial grayscale of the target pixel is multiplied by the same expansion coefficient.

[0097] The above-mentioned correspondence may include the relationship between the expansion coefficient and the maximum initial backlight brightness under n tones, and the expansion coefficient is negatively correlated with the maximum initial backlight brightness of the target pixel in the mth frame image. This correspondence can be determined through experiments, empirical data, etc. As can be seen from the curve in Figure 9, the greater the maximum initial backlight brightness, the smaller the expansion coefficient, and the smaller the maximum initial backlight brightness, the larger the expansion coefficient. At the same time, the expansion coefficient is greater than 1. If the initial backlight brightness is expressed as 255 in grayscale, the expansion coefficient can be 1.

[0098] In order to improve the smoothness of the brightness of different backlight partitions, the expanded backlight brightness of each backlight partition can be smoothed and filtered. For example:

[0099] A filter template can be used to scan all backlight zones and filter each to obtain its actual brightness. The filter template covers multiple backlight zones, and its size is determined by the number of covered backlight zones. For example, a filter template can be 3×3, meaning it covers nine backlight zones. Alternatively, a filter template can be 4×4, meaning it covers 16 backlight zones. The filter template divides the backlight module into multiple filter zones. As the filter template is scanned, the filter zones shift, and adjacent filter zones may partially overlap.

[0100] One of the backlight partitions within the filter template range is taken as the target backlight partition, and the backlight brightness of the target backlight partition is recalculated using the expanded backlight brightness of each backlight partition to obtain the actual backlight brightness.

[0101] Furthermore, the filtering process can be performed separately for each hue. The expanded backlight brightness for each hue can be used to calculate the actual brightness of the backlight partition for that hue. Within a subfield image, the actual brightness of the target backlight partition is the average of the expanded backlight brightnesses determined for each backlight partition within the same filtering template based on the initial backlight brightness.

[0102] Secondly, for a backlight subarea under the m-th frame image, the equivalent backlight obtained by each pixel under a tone can be determined based on the actual backlight brightness under the tone determined above, and then the compensation parameters of each pixel are determined based on the equivalent backlight. The details are as follows:

[0103] For any backlight partition, the positions of the light-emitting devices can be marked to obtain their position information, thereby determining the positions of the light-emitting devices that are directly opposite pixels and those that are not. Of course, no light-emitting devices in the same backlight partition need to be directly opposite pixels, as long as the positions of all light-emitting devices can be determined.

[0104] For a backlight zone, the equivalent backlight available to each pixel in that zone can be determined based on the actual brightness at each color tone, the position of the light-emitting device within the zone, and the point spread function (PSF) curve. The PSF curve can be predetermined through experimentation and empirical data to represent the region and specific data where the brightness of light emitted by a light-emitting device decreases with increasing distance from the device, and is not specifically limited here.

[0105] The above-mentioned equivalent brightness can reflect the brightness of light that each pixel can actually obtain. Based on this, the compensation parameters of the pixel can be determined. The compensation parameters can be used to control the deflection state of the liquid crystal, thereby realizing image display with actual brightness in coordination with the backlight partition.

[0106] In some embodiments of the present disclosure, the compensation parameter of a pixel may be determined by the following formula:

[0107] BLpsf is the equivalent brightness (expressed in grayscale), LC is the compensation parameter, and input is the actual brightness (expressed in grayscale).

[0108] In each subfield image, each backlight subzone emits at an actual brightness, and the pixels use compensation parameters to control grayscale. The actual brightness of the backlight subzones in different subfield images can be different, and the compensation parameters of the pixels can also be different. For example, if n = 3, the field sequential display has three hues: red, green, and blue. Each backlight subzone also has three actual brightness and compensation parameters: the actual brightness and compensation parameters of the backlight subzone in the red subfield image, the actual brightness and compensation parameters of the backlight subzone in the green subfield image, and the actual brightness and compensation parameters of the backlight subzone in the blue subfield image.

[0109] Based on the first liquid crystal display device described above, the image display method is described below:

[0110] As shown in FIG8 , the image display method may include: executing steps S110 to S130 in the first working mode, wherein:

[0111] Step S110 , receiving initial display information of each pixel of the m-th frame image; the initial display information of each pixel includes initial grayscales in n different tones; m and n are positive integers, and n≥2.

[0112] Step S120 : determining the actual brightness of each backlight subarea at n tones and the compensation parameter of each pixel according to the initial display information.

[0113] In some embodiments of the present disclosure, determining the actual color information of the pixel based on the initial display information, i.e., step S120, may include steps S1210 to S1240, wherein:

[0114] Step S1210: determining the initial backlight brightness of each backlight subarea at n tones according to the initial display information;

[0115] Step S1220, amplifying the initial backlight brightness to obtain amplified backlight brightness;

[0116] Step S1230: determining the actual brightness and the equivalent backlight of each pixel according to the amplified backlight brightness;

[0117] Step S1240: Determine a compensation parameter for each pixel according to the equivalent backlight.

[0118] Step S130 : According to the actual brightness of each backlight partition and the compensation parameter of each pixel, control each backlight partition and the pixel to sequentially display n sub-field images of different tones to obtain the mth frame image.

[0119] Under one of the subfield images, light devices of the same color in each of the backlight partitions emit light, and actual brightness of the backlight partition is greater than initial backlight brightness determined based on the initial display information.

[0120] The details of the image display method have been described in detail in the above liquid crystal display device embodiment and will not be repeated here.

[0121] Furthermore, in some embodiments of the present disclosure, the control circuit CU further includes a second operating mode, and in the second operating mode is configured to: upon receiving initial display information for the mth frame image, control the liquid crystal display device to sequentially display n subfield images based on the actual brightness of each backlight subarea determined based on the initial display information and the compensation parameter of each pixel, 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 display information, and the actual grayscale is its initial grayscale.

[0122] In the second working mode, the actual brightness of a backlight partition can directly adopt the initial backlight brightness determined based on an initial grayscale, so there is no need to perform the above expansion process. The initial backlight brightness, filtering process and compensation parameter determination process can proceed normally.

[0123] The first and second operating modes described above can be activated upon receiving an activation signal. For example, an image capture device can capture an image of the user's eyeball, and an image processing device can determine the eyeball's movement speed based on the eyeball image. When the movement speed reaches a speed threshold, color separation becomes more pronounced. In this case, the control circuit CU can be placed in the first operating mode to eliminate color separation. When the movement speed does not reach the speed threshold, the color separation may be less pronounced. In this case, the control circuit CU can be placed in the second operating mode to improve operational efficiency.

[0124] An embodiment of the present disclosure provides an electronic device, which may include a liquid crystal display device. The structure of the liquid crystal display device may be the liquid crystal display device of any embodiment described above, which will not be described in detail here.

[0125] As shown in FIG7 , the electronic device further includes an image acquisition device and an image processing device, wherein:

[0126] 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.

[0127] The image processing device CP can be connected to the image acquisition device CAM. It can determine the eye movement speed based on the eye image and, when the movement speed reaches a speed threshold, output a start signal to the control circuit CU, placing the control circuit CU in a first operating mode. If the movement speed does not reach the speed threshold, no start signal is output, and the control circuit CU enters a second operating mode.

[0128] The image processing device CP can identify the pupil center based on the image of the eyeball and determine the movement speed of the eyeball based on the change in the position of the pupil center.

[0129] In some embodiments, the electronic device may further include an infrared detection device that uses infrared light to locate the center of the user's cornea. The line connecting the corneal center and the pupil center identified by the image processing device is the optical axis of the visual system. The true line of sight can then be determined based on the angle between the optical axis and the visual axis. Furthermore, a thermal mirror may be included to reduce tracking errors without affecting the display; alternatively, an optical waveguide may be used to transmit infrared light and eye images.

[0130] In addition, eye tracking may also be achieved through other methods, which are not particularly limited here.

[0131] The electronic device disclosed herein may be a mobile phone, a television, a tablet computer, or a head-mounted display device such as smart glasses, which are not listed here one by one.

[0132] It should be noted that although the steps of the image display method of the present disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in this specific order, or that all steps must be performed to achieve the desired results. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or a single step may be broken down into multiple steps.

[0133] 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 variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A liquid crystal display device, wherein: 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 partitions, and each of the backlight partitions 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 initial display information of each pixel of the m-th frame image, and control each backlight partition and the pixel to sequentially display n sub-field images of different tones according to the actual brightness of each backlight partition determined based on the initial display information and the compensation parameter of each pixel, so as to obtain the m-th frame image; m and n are positive integers, n≥2; the initial display information of each pixel includes an initial grayscale under n tones; Under one of the subfield images, the light devices of the same color of each of the backlight partitions emit light, and the actual brightness of the backlight partition is greater than the initial backlight brightness determined based on the initial display information.

2. The liquid crystal display device according to claim 1, wherein: The liquid crystal display panel can be divided into a plurality of filter areas by a filter template, one of the filter areas includes a plurality of the backlight partitions, and one of the backlight partitions in the filter area is a target backlight partition; Under the sub-field image: The actual brightness of the target backlight partition is an average value of the expanded backlight brightness determined based on the initial backlight brightness of each backlight partition in the same filtering area; The enlarged backlight brightness of the backlight partition is the product of the initial backlight brightness of the backlight partition and an enlargement coefficient.

3. The liquid crystal display device according to claim 2, wherein: Under the sub-field image: The initial backlight brightness is one of the initial grayscales of one of the pixels corresponding to the backlight partitions having the maximum pixel brightness; The pixel brightness of the pixel is obtained by graying the initial gray level of the initial display information.

4. The liquid crystal display device according to claim 3, wherein: n=3, the hues include red, green and blue; In the mth frame image, the pixel brightness of a pixel and its initial grayscale satisfy the following relationship: Ls=k1×(R / 255) 2.2 +k2×(G / 255) 2.2 +k3×(B / 255) 2.2 ; Ls is the pixel brightness, R is the initial grayscale of red, G is the initial grayscale of blue, and B is the initial grayscale of blue.

5. The liquid crystal display device according to claim 4, wherein: The pixel with the largest pixel brightness among the pixels corresponding to the backlight partition is the target pixel of the backlight partition; the initial backlight brightness of the backlight partition is the largest one among the initial grayscales of the initial display information of the target pixel.

6. The liquid crystal display device according to claim 5, wherein: The expansion coefficient is negatively correlated with the maximum initial backlight brightness of the target pixel.

7. The liquid crystal display device according to any one of claims 1 to 6, wherein: The control circuit further includes a second working mode, and in the second working mode is configured to: receive the initial display information of the m-th frame image, and control the liquid crystal display device to sequentially display n subfield images according to the actual brightness of each backlight partition determined based on the initial display information and the compensation parameter of each pixel, so as to obtain the m-th frame image; In a subfield image of the second working mode, light devices of the same color in each of the backlight partitions emit light, and actual brightness of the backlight partitions is the same as an initial backlight brightness determined based on an initial grayscale.

8. The liquid crystal display device according to any one of claims 1 to 6, wherein: 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.

9. A method for displaying an image, wherein: 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 plurality of pixels; the image display method comprises: In the first working mode: Receive initial display information of each pixel of the m-th frame image; the initial display information of each pixel includes initial grayscales in n different tones; m and n are positive integers, n≥2; Determining the actual brightness of each of the backlight subareas at n tones and the compensation parameter of each of the pixels according to the initial display information; According to the actual brightness of each backlight partition and the compensation parameter of each pixel, each backlight partition and the pixel are controlled to sequentially display n subfield images of different tones to obtain the mth frame image; Under one of the subfield images, the light devices of the same color of each of the backlight partitions emit light, and the actual brightness of the backlight partition is greater than the initial backlight brightness determined based on the initial display information.

10. The image display method according to claim 9, wherein: Determining the actual brightness of each backlight subarea at n tones and the compensation parameter of each pixel according to the initial display information; comprising: Determine the initial backlight brightness of each backlight subarea at n tones according to the initial display information; Amplifying the initial backlight brightness to obtain an amplified backlight brightness; Determine the actual brightness and the equivalent backlight of each pixel according to the amplified backlight brightness; A compensation parameter of each of the pixels is determined according to the equivalent backlight.

11. The image display method according to claim 10, wherein: n=3, the hues include red, green and blue; Determining the initial backlight brightness of each backlight subarea at n tones according to the initial display information; comprising: The pixel brightness is determined according to the initial display information and a grayscale formula, where the grayscale formula is: Ls=0.3×(R / 255) 2.2 +0.6×(G / 255) 2.2 +0.1×(B / 255) 2.2 ; Ls is the pixel brightness, R is the initial grayscale of red, G is the initial grayscale of blue, and B is the initial grayscale of blue; The pixel with the largest pixel brightness among the pixels corresponding to a backlight partition is taken as the target pixel, and the initial backlight brightness of a backlight partition at a tone is the initial grayscale of the target pixel at the same tone.

12. The image display method according to claim 11, wherein: Amplifying the initial backlight brightness; comprising: Determining an expansion coefficient according to a maximum value of the initial backlight brightness under the n tones and a preset corresponding relationship; The product of the initial backlight brightness and the expansion coefficient at each of the color tones is calculated.

13. The image display method according to claim 10, wherein: Determining the actual brightness and the equivalent backlight of each pixel according to the amplified backlight brightness; comprising: All the backlight partitions are scanned using a filtering template, and each backlight partition is filtered to obtain the actual brightness of each backlight partition; the range of the filtering template covers a plurality of the backlight partitions.

14. The image display method according to claim 13, wherein: One of the backlight partitions within the coverage range of the filtering template is a target backlight partition; Under the sub-field image: The actual brightness of the target backlight partition is an average value of the expanded backlight brightness determined by each backlight partition within the same filtering template based on the initial backlight brightness.

15. The image display method according to claim 14, wherein: Determining the actual brightness and the equivalent backlight of each pixel according to the amplified backlight brightness; comprising: The equivalent backlight of each of the pixels corresponding to the backlight partition is determined according to the actual brightness, the position of the light-emitting device in the backlight partition, and the point spread curve.

16. An electronic device, wherein: A liquid crystal display device comprising any one of claims 1 to 8.

Images