Liquid crystal display device, image display method and electronic device

Abstract

This disclosure relates to a liquid crystal display device, an image display method, and an electronic device, and pertains to the display field. The liquid crystal display device includes a liquid crystal display panel and a control circuit. The liquid crystal display panel includes a liquid crystal display substrate and a backlight module. The backlight module includes multiple backlight zones, each backlight zone including light-emitting devices of n colors. The control circuit is configured in a first operating mode to: receive initial display information of each pixel of a frame m; and, based on the actual brightness of each backlight zone determined based on the initial display information and the compensation parameters of each pixel, control each backlight zone and pixel to display n sub-field images of different hues to obtain the frame m; m and n are positive integers, n ≥ 2; the initial display information of each pixel includes initial grayscale levels under n hues; under a sub-field image, light-emitting devices of the same color in each backlight zone emit light, and the actual brightness of the backlight zone is greater than the initial backlight brightness determined based on the initial display information.

Description

TECHNICAL FIELD

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

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

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

[0004] The purpose of the present disclosure is to overcome the shortcomings of the prior art and provide a liquid crystal display device, an image display method and an electronic device.

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

[0006] The control circuit comprises a first working mode, and in the first working mode, is configured to receive initial display information of each pixel of the mth frame image, control each backlight partition and the pixel to display n different tone sub-field images in turn according to actual brightness of each backlight partition determined based on the initial display information and compensation parameters of each pixel, so as to obtain the mth frame image; m and n are positive integers, and n≥2; the initial display information of each pixel comprises initial gray scales at n tones;

[0007] In one of the sub-field images, the light emitting devices of the same color of each backlight partition emit light, and the actual brightness of the backlight partition is greater than the initial backlight brightness determined based on the initial display information;

[0008] The method for determining the compensation parameters comprises:

[0009] determining initial backlight brightness of each backlight partition at n tones according to the initial display information;

[0010] amplifying the initial backlight brightness to obtain amplified backlight brightness;

[0011] determining actual brightness and equivalent backlight of each pixel according to the amplified backlight brightness;

[0012] The compensation parameters of each of the pixels are determined according to the equivalent backlight.

[0013] In an exemplary embodiment of the present disclosure, the liquid crystal display panel can be divided into a plurality of filter regions by a filter template, one of the filter regions includes a plurality of the backlight sub-regions, and one of the backlight sub-regions in the filter region is a target backlight sub-region.

[0014] Under one of the sub-field images:

[0015] The actual brightness of the target backlight sub-region is an average of the amplified backlight brightnesses of each of the backlight sub-regions in the same filter region based on the initial backlight brightness;

[0016] The amplified backlight brightness of one of the backlight sub-regions is a product of the initial backlight brightness of the backlight sub-region and an amplification coefficient.

[0017] In an exemplary embodiment of the present disclosure, under one of the sub-field images:

[0018] The initial backlight brightness is one of the initial gray scales of one of the pixels corresponding to the backlight sub-region with the maximum pixel brightness.

[0019] The pixel brightness of one of the pixels is obtained by gray-scale processing of the initial gray scale of the initial display information thereof.

[0020] In an exemplary embodiment of the present disclosure, n=3, and the color tones include red, green and blue.

[0021] Under the mth image, the pixel brightness of one of the pixels and the initial gray scale thereof satisfy the following relationship:

[0022] Ls=k1×(R / 255) 2.2 +k2×(G / 255) 2.2 + k3×(B / 255) 2.2 ;

[0023] Ls is the pixel brightness, R is the initial gray scale of red, G is the initial gray scale of green, B is the initial gray scale of blue; k1 is the weight of red in the brightness of the pixel, k2 is the weight of green in the brightness of the pixel, and k3 is the weight of blue in the brightness of the pixel.

[0024] In an exemplary embodiment of the present disclosure, one of the pixels corresponding to one of the backlight sub-regions with the maximum pixel brightness is a target pixel of the backlight sub-region, and the initial backlight brightness of one of the backlight sub-regions is the maximum one of the initial gray scales of the initial display information of the target pixel.

[0025] In an exemplary embodiment of the present disclosure, the expansion coefficient is negatively correlated with the maximum initial backlight brightness of the target pixel.

[0026] In an exemplary embodiment of the present disclosure, the control circuit further comprises a second working mode, and in the second working mode, the control circuit is configured to: receive the initial display information of the mth frame of image, and control the liquid crystal display device to display n sub-field images in sequence according to the actual brightness of each backlight partition and the compensation parameter of each pixel determined based on the initial display information, so as to obtain the mth frame of image.

[0027] In a sub-field image of the second working mode, the light emitting devices of the same color of each backlight partition emit light, and the actual brightness of the backlight partition is the same as the initial backlight brightness determined based on an initial gray scale.

[0028] In an exemplary embodiment of the present disclosure, the liquid crystal display substrate comprises:

[0029] An array substrate and an opposite substrate arranged oppositely;

[0030] A liquid crystal layer arranged between the array substrate and the opposite substrate;

[0031] The control circuit is connected with the array substrate and the backlight module.

[0032] According to an aspect of the present disclosure, an image display method is provided for a liquid crystal display device, the liquid crystal display device comprising a liquid crystal display panel and a control circuit, the liquid crystal display panel comprising a liquid crystal display substrate and a backlight module; the liquid crystal display panel comprises a plurality of pixels, and the backlight module comprises a plurality of backlight partitions, each of which comprises light emitting devices of n colors; the image display method comprises:

[0033] In a first working mode:

[0034] Receiving initial display information of each pixel of the mth frame of image; the initial display information of each pixel comprises initial gray scales in n different tones; m and n are positive integers, and n≥2;

[0035] Determining the actual brightness of each backlight partition in n tones and the compensation parameter of each pixel according to the initial display information;

[0036] Controlling each backlight partition and the pixel to display n sub-field images in different tones in sequence according to the actual brightness of each backlight partition and the compensation parameter of each pixel, so as to obtain the mth frame of image;

[0037] In one of the sub-field images, the light emitting 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;

[0038] The actual brightness of each of the backlight partitions in n color tones and the compensation parameters of each of the pixels are determined according to the initial display information, including:

[0039] The initial backlight brightness of each of the backlight partitions in n color tones is determined according to the initial display information.

[0040] The initial backlight brightness is amplified to obtain an amplified backlight brightness.

[0041] The actual brightness and the equivalent backlight of each of the pixels are determined according to the amplified backlight brightness.

[0042] The compensation parameters of each of the pixels are determined according to the equivalent backlight.

[0043] In an exemplary embodiment of the present disclosure, n=3, and the color tones include red, green and blue.

[0044] The initial backlight brightness of each of the backlight partitions in n color tones is determined according to the initial display information, including:

[0045] The pixel brightness is determined according to the initial display information and a grayscale formula, the grayscale formula being:

[0046] Ls=0.3×(R / 255) 2.2 +0.6×(G / 255) 2.2 + 0.1×(B / 255) 2.2 ;

[0047] Ls is the pixel brightness, R is the initial gray scale of red, G is the initial gray scale of green, and B is the initial gray scale of blue; k1 is the weight of red in the brightness of the pixel, k2 is the weight of green in the brightness of the pixel, and k3 is the weight of blue in the brightness of the pixel.

[0048] One of the pixels with the maximum pixel brightness in each of the pixels corresponding to one of the backlight partitions is taken as a target pixel, and the initial backlight brightness of one of the backlight partitions in one of the color tones is the initial gray scale of the target pixel in the same color tone.

[0049] In an exemplary embodiment of the present disclosure, the initial backlight brightness is amplified, including:

[0050] The amplification coefficient is determined according to the maximum value of the initial backlight brightness in n color tones and a preset corresponding relationship.

[0051] The product of the initial backlight brightness and the amplification factor under each of the color tones is calculated.

[0052] In an exemplary embodiment of the present disclosure, determining the actual brightness and the equivalent backlight of each of the pixels according to the amplified backlight brightness comprises:

[0053] Filtering each of the backlight partitions by scanning all of the backlight partitions with a filter template, to obtain the actual brightness of each of the backlight partitions; the filter template covers a plurality of the backlight partitions.

[0054] In an exemplary embodiment of the present disclosure, one of the backlight partitions in the range covered by the filter template is a target backlight partition.

[0055] Under one of the sub-field images:

[0056] The actual brightness of the target backlight partition is the average of the amplified backlight brightness of each of the backlight partitions in the same filter template, which is determined according to the initial backlight brightness.

[0057] In an exemplary embodiment of the present disclosure, determining the actual brightness and the equivalent backlight of each of the pixels according to the amplified backlight brightness comprises:

[0058] Determining the equivalent backlight of each of the pixels corresponding to the backlight partition according to the actual brightness, the position of the light emitting device in the backlight partition, and the point spread curve.

[0059] According to an aspect of the present disclosure, an electronic device is provided, comprising the liquid crystal display device of any one of the above.

[0060] The liquid crystal display device, the image display method, and the electronic device of the present disclosure can realize field sequential display by temporally mixing colors of n sub-field images displayed in sequence, without using spatial color mixing, without setting a color filter, improving light output efficiency, and without setting sub-pixels of different colors, which is conducive to improving resolution.

[0061] In addition, in the first working mode, under one of the sub-field images, the light emitting devices of the same color in 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, which can avoid overflow of the compensation parameter of the pixel, prevent the actual display brightness of the pixel from being lower than the original brightness, and thus weaken the color separation phenomenon by increasing the brightness.

[0062] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and are not limiting to the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0063] The accompanying drawings, which are incorporated herein and constitute part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, further serve to explain the principles of the present disclosure. It is apparent that the accompanying drawings are only some embodiments of the present disclosure, and other drawings can be obtained from the following description without creative effort.

[0064] Figure 1 Structure diagram of an embodiment of the liquid crystal display device of the present disclosure.

[0065] Figure 2 Circuit schematic diagram of an embodiment of the liquid crystal display device of the present disclosure.

[0066] Figure 3 Partial schematic diagram of the mth frame of image in the first working mode of the liquid crystal display device of the present disclosure.

[0067] Figures 4-6 Schematic diagram of Figure 3

[0068] Figure 7 Schematic diagram of an embodiment of the electronic device of the present disclosure.

[0069] Figure 8 Flow chart of the image processing method of the present disclosure.

[0070] Figure 9 Schematic diagram of the relationship between the maximum initial backlight brightness and the expansion coefficient in the liquid crystal display device of the present disclosure. DETAILED DESCRIPTION

[0071] Example embodiments now will be described more fully hereinafter with reference to the accompanying drawings. Example embodiments, may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided as non-limiting examples so that this disclosure will be thorough and complete, and will fully convey the scope of the example embodiments to those skilled in the art. Like reference numerals refer to like elements throughout the description. Additionally, the drawings are merely schematic and are not drawn to scale.

[0072] The terms "one", "a", "an", "said", and "the" are used to indicate the presence of one or more than one element / component / etc.; the terms "include" and "has" are used to indicate an open-ended inclusion of one or more elements / components / etc. and do not exclude additional elements / components / etc.; the terms "first", "second", and "third" etc. are used only to distinguish one element / component / etc. from another element / component / etc. and do not limit the number of elements / components / etc.

[0073] ​The present disclosure provides a liquid crystal display device, such as Figure 1 and Figure 2 The liquid crystal display device can include a liquid crystal display panel and a control circuit CU, as shown in the following figure:

[0074] The liquid crystal display panel can include a liquid crystal display substrate PNL and a backlight module BLU, and have a plurality of pixels arranged in an array, the pixel being the minimum display unit. The liquid crystal display substrate PNL can include an array substrate TB, an opposite substrate FB, and a liquid crystal layer LL arranged between the array substrate TB and the opposite substrate FB.

[0075] The liquid crystal display substrate PNL further includes a pixel electrode and a common electrode. The pixel electrode can be arranged on the array substrate TB, and the common electrode can be arranged on the array substrate TB or the opposite substrate FB, and a pixel includes a pixel electrode. The array substrate TB has a driving circuit, and the control circuit CU can be arranged on the array substrate TB and control the voltage between the pixel electrode and the common electrode through the driving circuit, so as to control the deflection degree of the liquid crystal molecules of the liquid crystal layer LL, and further control the light transmittance of each pixel, thereby realizing the adjustment of the gray scale of each pixel.

[0076] The backlight module BLU can be arranged on the side of the array substrate TB away from the opposite substrate FB, and the backlight module BLU can emit light to the array substrate TB under the control of the control circuit CU.

[0077] In some embodiments, the opposite substrate FB can include a color filter layer, and the color filter layer includes a plurality of filter parts, and a pixel includes a filter part. The filter part filters the light, so that a pixel emits monochromatic light, and the light emitting colors of different pixels can be different. 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 improved, the power of the backlight module BLU needs to be increased, resulting in increased power consumption.

[0078] In order to improve the light extraction efficiency without increasing the power consumption, in some embodiments, the opposite substrate FB can not be provided with a color filter layer, so as to reduce the light loss and improve the light extraction efficiency. In order to realize color display, the backlight module BLU can include n kinds of light emitting devices of different colors, and the number of light emitting devices of the same color is not particularly limited and can be one or more. The color of the light emitted by the backlight module BLU is the color tone of the formed picture, and 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 gray scale of the pixel, and realizing image display through the cooperation of the backlight module BLU and the pixel.

[0079] On this basis, when displaying an image, field sequential display can be used, for example, n subfield images are displayed in sequence within the time of one frame, each subfield image is a monochrome image, the gray scale of different pixels in each subfield image can be different, and the gray scale of the same pixel in different subfield images can be different. The backlight module BLU emits light of the same color when displaying the same subfield image, and emits light of different colors when displaying different subfield images, for example, only one color of light emitting device in the backlight module BLU emits light when displaying each subfield image, so that each subfield image has only one tone, i.e. one color. Thus, based on the visual persistence phenomenon, one frame of image can be obtained.

[0080] Further, the backlight module BLU can be divided into a plurality of backlight partitions, each backlight partition has a plurality of light emitting devices, the light emitting devices of the same color in the same backlight partition can emit light at the same time and have the same brightness. The light emitting devices of different backlight partitions can be independently controlled and have different brightness, so that local dimming can be realized. One backlight partition can correspond to a plurality of pixels, i.e. the orthographic projection of a plurality of pixels on the backlight module is located in one backlight partition, and the light emitting devices of n colors are provided in the same backlight partition.

[0081] As shown in FIG. 1, Figure 2 In some embodiments of the present disclosure, the control circuit CU can be used to execute one or more working modes, including a first working mode, in which:

[0082] The control circuit CU is configured to receive initial display information of each pixel of the mth frame of image, and control the brightness of each backlight partition and the gray scale of each pixel according to the initial display information, and display n subfield images of different tones in sequence to obtain the mth frame of image. m and n are positive integers, and n≥2.

[0083] The initial display information of each pixel can include initial gray scales in n tones. For one pixel of one frame of image, the initial gray scales in n tones can be used to display in sequence to realize time 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 display information of each pixel of the mth frame of image can include initial gray scales of red, green and blue.

[0084] Figures 4 to 6 Three subfield images are shown. In different subfield images, the light emitting pixels P form a plurality of stripe patterns, and the light emitting pixels in different subfield images can be different or can overlap, i.e. the same pixel can emit light in each subfield image. The three subfield images can form Figure 3 The mth frame of image is shown. It should be noted that, Figure 3The three sub-field images are only used for illustrating the principle of color mixing and the visual effect of forming a frame of image, and do not limit the specific pattern of the sub-field images.

[0085] In an embodiment, the backlight module BLU can include three light emitting devices, which can emit red light, green light and blue light respectively. A frame of image can be divided into three sub-field images, the color tone of the pattern of the three sub-field images is red, green and blue respectively, and the three sub-field images are displayed in sequence to form a frame of image in visual effect.

[0086] As shown in Figure 2 The control circuit CU can be connected with the array substrate TB and the backlight module BLU, and used for controlling the light emitting of the backlight module BLU and the deflection degree of the liquid crystal, i.e. the color and gray scale of each pixel. The control circuit CU can include a timing controller, a gate driving circuit, a source driving circuit, a backlight control circuit, etc., and the specific configuration of which is not particularly limited herein.

[0087] The inventors find that when the field sequential display is used, since a frame of image needs to be formed by color mixing of multiple sub-field images displayed at different times, when the user blinks, scans or the target in the picture moves, the user can observe the red, green and blue color tones in the picture at the same time, i.e. color separation phenomenon occurs.

[0088] The inventors find 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 parameter of the pixel, which is described below by way of example:

[0089] In the first working mode, the control circuit CU can receive initial display information of the mth frame of display image, m and n are positive integers, and n≥2; the initial display information of each pixel includes initial gray scales in n color tones; according to the actual brightness of each backlight partition and the compensation parameter of each pixel determined based on the initial display information, the control circuit controls the backlight partitions and the pixels to display n sub-field images of different color tones in sequence to obtain the mth frame of image. In a sub-field image, the light emitting devices of the same color of each backlight partition emit light, and the actual brightness of the backlight partition is greater than the initial backlight brightness determined based on the initial display information. The backlight partition can be controlled to emit light at its actual brightness, and the gray scale of the pixel is controlled by the compensation parameter, so as to obtain n field sequential images, display one field sequential image, and the light emitting devices of the same color of each backlight partition emit light.

[0090] 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, prevent the actual display brightness of the pixel from being lower than the original brightness, and thus weaken the color separation phenomenon by increasing the brightness.

[0091] The determination of the actual brightness and the compensation parameter according to the initial display information is described in detail as follows:

[0092] First, the initial backlight brightness can be determined according to the initial display information, then the amplified backlight brightness is determined according to the initial backlight brightness, and finally the actual backlight brightness is determined according to the amplified backlight brightness; the following will be described in detail:

[0093] 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, under the same frame image, the initial backlight brightness of one pixel is n, for example, n = 3, and the tones include red, green and blue, then the initial backlight brightness can include the initial backlight brightness of red, the backlight brightness of green and the backlight brightness of blue.

[0094] In some embodiments of the present disclosure, the initial gray scale of the initial display information of a pixel can be grayed according to a graying formula to obtain the pixel brightness of the pixel, and the initial display information is converted to the brightness domain, for example, the graying formula is:

[0095] Ls=k1×(R / 255) 2.2 +k2×(G / 255) 2.2 + k3×(B / 255) 2.2 ;

[0096] Ls is the pixel brightness, R is the initial gray scale of red, G is the initial gray scale of green, and B is the initial gray scale of blue. k1 is the weight of red in the brightness of the pixel, k2 is the weight of green in the brightness of the pixel, and k3 is the weight of blue in the brightness of the pixel; k1 can be 0.3, k2 can be 0.6, and k3 can be 0.1. 2.2 is the gamma value.

[0097] The initial backlight brightness is positively correlated with the initial gray scale, so when the maximum initial backlight brightness is selected, the maximum initial gray scale is actually selected.

[0098] The initial backlight brightness of red is (R / 255) 2.2 , and the same applies to blue and green or other colors.

[0099] The pixel brightness of one of the pixels corresponding to a backlight partition can be taken as a target pixel, and the initial backlight brightness of a backlight partition under a tone can be represented by the initial gray scale of the target pixel under the tone, that is, for a backlight partition, in a field sequential image, the light emitting devices of the same color emit light, and the initial backlight brightness of the backlight partition under the tone can be represented by the initial gray scale of the target pixel under the tone, and the proportional relationship of the initial gray scales of different colors will not change, compared with the method of determining the initial backlight brightness in the nonlinear domain, which is beneficial to prevent color distortion.

[0100] Since the number of light emitting devices of a backlight partition is less than the number of pixels corresponding to the backlight partition, and a light emitting device is directly opposite a pixel in a direction perpendicular to the liquid crystal display substrate, and part of the pixels are not directly opposite any light emitting device, the light emitted by the light emitting device is irradiated to the pixels not directly opposite at a certain angle, compared with the brightness of the light received by the pixels directly opposite, the brightness of the light received by the pixels directly opposite is reduced, that is, there is attenuation, in order to avoid the attenuation leading to insufficient brightness, after obtaining the initial backlight brightness, the initial backlight brightness can be amplified to obtain an amplified backlight brightness, so that the brightness of the pixels not directly opposite is increased. For example:

[0101] For the initial display information of the mth frame of image, for each initial gray scale 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; the product of the initial backlight brightness under each tone and the expansion coefficient is calculated to obtain the amplified backlight brightness, that is, each initial gray scale of the target pixel is multiplied by the same expansion coefficient.

[0102] The above-mentioned corresponding relationship can 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 under the mth frame of image, the corresponding relationship can be determined by experiments, empirical data, etc., from Figure 9 As can be seen from the curve in the formula (1), the larger 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 represented by gray scale as 255, the expansion coefficient can be 1.

[0103] In order to improve the smoothness of the brightness of different backlight partitions, the amplified backlight brightness of each backlight partition can be filtered, for example:

[0104] The filter template can be used to scan all the backlight partitions, and each backlight partition can be filtered to obtain the actual brightness of each backlight partition; the range of the filter template covers multiple backlight partitions, and the size of the filter template can be limited by the number of the covered backlight partitions, for example, the size of the filter template can be 3x3, that is, the filter template can cover 9 backlight partitions, and the size of the filter template can also be 4x4, that is, the filter template can cover 16 backlight partitions. The backlight module can be divided into multiple filtering areas by the filter template, the filter template is scanned, the filtering area also moves, and the adjacent filtering areas can partially overlap.

[0105] Taking one of the backlight partitions in the range of the filter template as a target backlight partition, the backlight brightness of the target backlight partition is recalculated by using the amplified backlight brightness of each backlight partition to obtain the actual backlight brightness.

[0106] Further, the above filtering process can be performed for each color tone, and the amplified backlight brightness of each color tone can be used to calculate the actual brightness of the backlight partition of the color tone. In a sub-field image, the actual brightness of the target backlight partition is the average of the amplified backlight brightness of each backlight partition in the same filter template based on the initial backlight brightness.

[0107] Secondly, for a backlight partition in the mthframe image, the equivalent backlight obtained by each pixel in the color tone can be determined according to the actual backlight brightness of the color tone determined above, and the compensation parameter of each pixel can be determined according to the equivalent backlight. Details are as follows:

[0108] For any backlight partition, the positions of the light emitting devices can be marked to obtain the position information of the light emitting devices, so that the positions of the light emitting devices directly opposite the pixels and the light emitting devices not directly opposite the pixels can be determined. Of course, there can be no light emitting device directly opposite the pixels in the same backlight partition, as long as the positions of the light emitting devices can be determined.

[0109] For a backlight partition, the equivalent backlight that can be obtained by each pixel corresponding to the backlight partition can be determined according to the actual brightness in each color tone, the positions of the light emitting devices in the backlight partition, and a point spread curve (PSF curve). The point spread curve (PSF curve) can be determined in advance through experiments and empirical data, and is used to reflect the area and specific data in which the brightness of the light emitted by the light emitting device decays as the distance increases, which is not specially limited here.

[0110] The equivalent brightness can reflect the brightness of the light that can be actually obtained by each pixel, based on which the compensation parameter of the pixel can be determined. The compensation parameter can be used to control the deflection state of the liquid crystal, so as to realize image display in cooperation with the actual brightness of the backlight partition.

[0111] In some embodiments of the present disclosure, the compensation parameter of a pixel can be determined by the following formula:

[0112] ;

[0113] BLpsf is the equivalent brightness (expressed in gray scale), LC is the compensation parameter, and input is the actual brightness (expressed in gray scale).

[0114] In each sub-field image, each backlight partition emits with an actual luminance, and the pixels control the gray scale with compensation parameters. The actual luminance of the backlight partition and the compensation parameters of the pixels can be different in different sub-field images. For example, n = 3, the color tone of the field sequential display is three, i.e. red, green and blue, and the actual luminance of each backlight partition and the compensation parameters of the pixels also have three, i.e. the actual luminance of the backlight partition and the compensation parameters of the pixels in the red sub-field image, the actual luminance of the backlight partition and the compensation parameters of the pixels in the green sub-field image, and the actual luminance of the backlight partition and the compensation parameters of the pixels in the blue sub-field image.

[0115] Based on the first liquid crystal display device described above, the image display method is described as follows:

[0116] As shown in Figure 8 , the image display method can include: performing steps S110-S130 in the first working mode, wherein:

[0117] Step S110, receiving initial display information of each pixel of the mth frame image; the initial display information of each pixel includes initial gray scales in n different color tones; m and n are positive integers, and n≥2.

[0118] Step S120, determining actual luminance of each backlight partition in n color tones and compensation parameters of each pixel according to the initial display information.

[0119] In some embodiments of the present disclosure, the actual color information of the pixel is determined according to the initial display information; that is, step S120 can include steps S1210-S1240, wherein:

[0120] Step S1210, determining initial backlight luminance of each backlight partition in n color tones according to the initial display information;

[0121] Step S1220, amplifying the initial backlight luminance to obtain amplified backlight luminance;

[0122] Step S1230, determining actual luminance and equivalent backlight of each pixel according to the amplified backlight luminance;

[0123] Step S1240, determining compensation parameters of each pixel according to the equivalent backlight.

[0124] Step S130, controlling each backlight partition and the pixel to display n different color tone sub-field images in sequence according to the actual luminance of each backlight partition and the compensation parameters of each pixel, so as to obtain the mth frame image.

[0125] In one of the sub-field images, the light emitting 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.

[0126] Details of the image display method have been described in the liquid crystal display device embodiments above, and will not be repeated here.

[0127] In addition, in some embodiments of the present disclosure, the control circuit CU further comprises a second working mode, and in the second working mode, the control circuit CU is configured to: if the initial display information of the mth frame of image is received, control the liquid crystal display device to display n sub-field images in sequence 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 mth frame of image; m and n are positive integers, and n is greater than or equal to 2. The actual color information of each pixel is the initial display information thereof, and the actual gray scale is the initial gray scale thereof.

[0128] In the second working mode, the actual brightness of one backlight partition can directly use the initial backlight brightness determined based on an initial gray scale, so that the expansion process above does not need to be performed, and the filtering process of the initial backlight brightness and the process of determining the compensation parameter can be normally performed.

[0129] The first working mode and the second working mode above can be started when a start signal is received. For example, the image of the eyeball of the user can be acquired by the image acquisition device, and the movement speed of the eyeball can be determined by the image processing device according to the image of the eyeball. When the movement speed reaches a speed threshold, the color separation phenomenon is more obvious. At this time, the control circuit CU can be in the first working mode to eliminate the color separation. When the movement speed does not reach the speed threshold, the color separation phenomenon can not be obvious. At this time, the control circuit CU can be in the second working mode, so as to improve the running efficiency.

[0130] The embodiments of the present disclosure provide an electronic device, which can comprise a liquid crystal display device, and the structure of the liquid crystal display device can be the liquid crystal display device of any of the embodiments above, which will not be repeated here.

[0131] As shown in Figure 7 The electronic device further comprises an image acquisition device and an image processing device, wherein:

[0132] The image acquisition device CAM can comprise one or more cameras, and of course, other devices capable of acquiring image information of human or object features can also be used. The image acquisition device CAM can acquire the image of the eyeball of the user in real time.

[0133] The image processing device CP can be connected with the image acquisition device CAM, which can determine the moving speed of the eyeball according to the image of the eyeball, and output a start signal to the control circuit CU when the moving speed reaches a speed threshold, so that the control circuit CU is in the first working mode. When the moving speed does not reach the speed threshold, no start signal is output, and the control circuit CU is in the second working mode.

[0134] The image processing device CP can identify the pupil center according to the image of the eyeball, and determine the moving speed of the eyeball according to the change of the position of the pupil center.

[0135] In some embodiments, the electronic device can further include an infrared detection device, which can locate the corneal center of the user through infrared light, and the line connecting the corneal center and the pupil center identified by the image processing device is the optical axis of the visual system. The real visual line direction can be obtained according to the included angle between the optical axis and the visual axis. In addition, a hot mirror can be further included to reduce the tracking error without affecting the display of the picture; or the infrared light and the eye image can be transmitted by using an optical waveguide.

[0136] In addition, the eyeball tracking can also be realized by other ways, which are not particularly limited here.

[0137] The electronic device of the present disclosure can be a mobile phone, a television, a tablet computer, and can also be a smart glasses and the like head-mounted display device, which are not listed one by one here.

[0138] 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 these steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. In addition or alternatively, some steps can be omitted, a plurality of steps can be combined into one step, and / or one step can be divided into a plurality of steps, etc.

[0139] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon considering the specification and practicing the application as disclosed herein. The present 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 general knowledge or custom in the art not specifically disclosed. The specification and examples are to be regarded as illustrative 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 by comprising: 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, and the backlight module comprises a plurality of backlight sub-zones, each of which comprises light emitting devices of n colors; The control circuit comprises a first working mode, and in the first working mode, is configured to receive initial display information of each pixel of the mth frame of image, control each backlight sub-zone and the pixel to display n different tone sub-field images in turn according to actual brightness of each backlight sub-zone determined based on the initial display information and compensation parameters of each pixel, and obtain the mth frame of image; m and n are positive integers, and n≥2; the initial display information of each pixel comprises initial gray scales in n tones; In one sub-field image, light emitting devices of the same color of each backlight sub-zone emit light, and the actual brightness of the backlight sub-zone is greater than the initial backlight brightness determined based on the initial display information; The method for determining the compensation parameters comprises: determining initial backlight brightness of each backlight sub-zone in n tones according to the initial display information; amplifying the initial backlight brightness to obtain amplified backlight brightness; determining actual brightness and equivalent backlight of each pixel according to the amplified backlight brightness; determining the compensation parameters of each pixel according to the equivalent backlight.

2. The liquid crystal display device according to claim 1, wherein The liquid crystal display panel can be divided into a plurality of filtering regions by a filtering template, one filtering region comprises a plurality of backlight sub-zones, and one backlight sub-zone in the filtering region is a target backlight sub-zone; In one sub-field image: the actual brightness of the target backlight sub-zone is the average of the amplified backlight brightness of each backlight sub-zone in the same filtering region determined based on the initial backlight brightness; the amplified backlight brightness of one backlight sub-zone is the product of the initial backlight brightness of the backlight sub-zone and an expansion coefficient.

3. The liquid crystal display device according to claim 2, wherein In one sub-field image: the initial backlight brightness is one of the initial gray scales of one of the pixels having the maximum pixel brightness corresponding to the backlight sub-zone; the pixel brightness of one pixel is obtained by gray scaling the initial gray scale of the initial display information thereof.

4. The liquid crystal display device according to claim 3, wherein n=3, the tones comprise red, green and blue; In the mth frame of image, the pixel brightness of one pixel and the initial gray scale thereof 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 gray scale of red, G is the initial gray scale of green, and B is the initial gray scale of blue; k1 is the weight of red in the brightness of the pixel, k2 is the weight of green in the brightness of the pixel, and k3 is the weight of blue in the brightness of the pixel.

5. The liquid crystal display device according to claim 4, wherein one of the pixels corresponding to one backlight sub-zone having the maximum pixel brightness is a target pixel of the backlight sub-zone; and the initial backlight brightness of one backlight sub-zone is the maximum one of the initial gray scales 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 comprises a second working mode, and in the second working mode, the control circuit is configured to receive the initial display information of the mth frame of image, and control the liquid crystal display device to display n sub-field images in sequence according to the actual brightness of each backlight partition and the compensation parameter of each pixel determined based on the initial display information, so as to obtain the mth frame of image. In one of the sub-field images in the second working mode, the light emitting devices of the same color of each backlight partition emit light, and the actual brightness of the backlight partition is the same as the initial backlight brightness determined based on one of the initial gray scales.

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 an opposite substrate arranged oppositely; a liquid crystal layer arranged between the array substrate and the opposite substrate; the control circuit is connected with the array substrate and the backlight module.

9. An image display method characterized by 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; the liquid crystal display panel comprises a plurality of pixels, and the backlight module comprises a plurality of backlight partitions, each of which comprises light emitting devices of n colors; the image display method comprises: in a first working mode: receiving initial display information of each pixel of the mth frame of image; the initial display information of each pixel comprises initial gray scales in n different color tones; m and n are positive integers, and n≥2; determining the actual brightness of each backlight partition in n color tones and the compensation parameter of each pixel based on the initial display information; controlling each backlight partition and the pixel to display n sub-field images of different color tones in sequence according to the actual brightness of each backlight partition and the compensation parameter of each pixel, so as to obtain the mth frame of image; in one of the sub-field images, the light emitting devices of the same color of each backlight partition emit light, and the actual brightness of the backlight partition is greater than the initial backlight brightness determined based on the initial display information; determining the actual brightness of each backlight partition in n color tones and the compensation parameter of each pixel based on the initial display information; comprising: determining the initial backlight brightness of each backlight partition in n color tones based on the initial display information; amplifying the initial backlight brightness to obtain an amplified backlight brightness; determining the actual brightness and the equivalent backlight of each pixel based on the amplified backlight brightness; determining the compensation parameter of each pixel based on the equivalent backlight.

10. The image display method according to claim 9, wherein n=3, the color tones comprise red, green and blue; determining the initial backlight brightness of each backlight partition in n color tones based on the initial display information; comprising: determining the pixel brightness based on the initial display information and a gray scale formula, wherein the gray scale 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 gray scale of red, G is the initial gray scale of green, B is the initial gray scale of blue; k1 is the weight of red in the brightness of the pixel, k2 is the weight of green in the brightness of the pixel, and k3 is the weight of blue in the brightness of the pixel. A pixel with the maximum luminance among the pixels corresponding to a backlight partition is taken as a target pixel, and an initial backlight luminance of the backlight partition at a tone is an initial gray scale of the target pixel at the same tone.

11. The image display method according to claim 10, wherein The initial backlight luminance is amplified; including: A maximum value of the initial backlight luminance at n tones and a preset corresponding relation are used to determine an amplification coefficient; The product of the initial backlight luminance at each tone and the amplification coefficient is calculated.

12. The image display method according to claim 9, wherein Actual luminance and equivalent backlight of each pixel are determined according to the amplified backlight luminance; including: All the backlight partitions are scanned by using a filter template to filter each backlight partition to obtain actual luminance of each backlight partition; the range of the filter template covers multiple backlight partitions.

13. The image display method according to claim 12, wherein One of the backlight partitions in the range of the filter template is a target backlight partition; Under a sub-field image: The actual luminance of the target backlight partition is an average value of the amplified backlight luminance of each backlight partition in the same filter template based on the initial backlight luminance.

14. The image display method according to claim 13, wherein Actual luminance and equivalent backlight of each pixel are determined according to the amplified backlight luminance; including: Equivalent backlights of the pixels corresponding to the backlight partition are determined according to the actual luminance, the position of the light emitting device in the backlight partition and a point spread curve.

15. An electronic device, comprising: The liquid crystal display device of any one of claims 1-8 is included.

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