CN116631342B

CN116631342B - Liquid crystal display device, image display method and electronic device

Info

Publication number: CN116631342B
Application number: CN202310636765.3A
Authority: CN
Inventors: 彭项君; 吴琼; 薛慧玲; 张硕; 侯一凡; 王利忠; 宁策; 郭晖; 王龙辉
Original assignee: BOE Technology Group Co Ltd; Beijing BOE Technology Development Co Ltd
Current assignee: BOE Technology Group Co Ltd; Beijing BOE Technology Development Co Ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2026-01-30
Anticipated expiration: 2043-05-31
Also published as: CN116631342A; WO2024244852A1; WO2024244852A9

Abstract

The disclosure relates to a liquid crystal display device, an image display method and electronic equipment, and relates to the field of display. The liquid crystal display device comprises a liquid crystal display panel and a control circuit, wherein the liquid crystal display panel comprises a liquid crystal display substrate and a backlight module, the backlight module comprises a plurality of backlight partitions, each backlight partition comprises n-color light emitting devices, the control circuit is configured in a first working mode to receive initial display information of each pixel of an mth frame image, according to actual brightness of each backlight partition determined based on the initial display information and compensation parameters of each pixel, the backlight partitions and the pixels are controlled to display n sub-field images with different hues so as to obtain an mth frame image, m and n are positive integers, n is larger than or equal to 2, the initial display information of each pixel comprises initial gray scales under n hues, and under one sub-field image, the light devices with the same color of each backlight partition emit light, and the actual brightness of each backlight partition is larger than the initial backlight brightness determined based on the initial display information.

Description

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

Technical Field

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 apparatus.

Background

The display panel is an indispensable part of electronic devices such as televisions and mobile phones, and among them, the application of the liquid crystal display panel is relatively wide. The existing liquid crystal display panel has higher light loss and higher energy consumption in the light emitting process.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure is directed to overcoming the drawbacks of the prior art and providing a liquid crystal display device, an image display method and an electronic apparatus.

According to one aspect of the present disclosure, there is provided a liquid crystal display apparatus including a liquid crystal display panel including a liquid crystal display substrate including a plurality of pixels and a backlight module including a plurality of backlight partitions each including light emitting devices of n colors;

The control circuit comprises a first working mode and is configured in the first working mode to receive initial display information of each pixel of an mth frame image, and according to actual brightness of each backlight partition and compensation parameters of each pixel, which are determined based on the initial display information, the control circuit controls each backlight partition and each pixel to sequentially display sub-field images with n different hues so as to obtain the mth frame image, wherein m and n are positive integers, n is more than or equal to 2, and the initial display information of each pixel comprises initial gray scales under n hues;

under one subfield 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 method for determining the compensation parameter comprises the following steps:

determining initial backlight brightness of each backlight partition under 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;

and determining the compensation parameter of each pixel according to the equivalent backlight.

In an exemplary embodiment of the present disclosure, the liquid crystal display panel may 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;

Under one of the subfield images:

The actual brightness of the target backlight partition is the average value of the amplified backlight brightness determined by each backlight partition in the same filtering area based on the initial backlight brightness;

The amplified backlight luminance of one of the backlight partitions is a product of the initial backlight luminance of the backlight partition and an expansion coefficient.

In one exemplary embodiment of the present disclosure, under one of the subfield images:

the initial backlight brightness is one of the initial gray scales of one of the pixels corresponding to the backlight partition, which has the maximum pixel brightness;

the pixel brightness of a pixel is derived from the gray scale of the initial display information.

In one exemplary embodiment of the present disclosure, n=3, the hue includes red, green, and blue;

In the m-th frame of image, the pixel brightness of a pixel and the initial gray level 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 level of red, G is the initial gray level of green, B is the initial gray level of blue, k1 is the weight of red in the pixel brightness, k2 is the weight of green in the pixel brightness, and k3 is the weight of blue in the pixel brightness.

In an exemplary embodiment of the present disclosure, one of the pixels corresponding to the backlight partition with the largest pixel brightness is a target pixel of the backlight partition, and an initial backlight brightness of the backlight partition is the largest one of the initial gray scales of initial display information of the target pixel.

In one exemplary embodiment of the present disclosure, the expansion coefficient is inversely related to a maximum initial backlight brightness of the target pixel.

In one exemplary embodiment of the present disclosure, the control circuit further includes a second operation mode, and is configured in the second operation mode to receive the initial display information of an mth frame image, and to control the liquid crystal display device to sequentially display n subfield images according to the actual brightness of each of the backlight partitions and the compensation parameter of each of the pixels determined based on the initial display information, so as to obtain the mth frame image;

under one 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 one initial gray scale.

In one exemplary embodiment of the present disclosure, the liquid crystal display substrate includes:

An array substrate and a counter substrate disposed opposite to each other;

a liquid crystal layer disposed between the array substrate and the counter substrate;

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

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

in a first mode of operation:

receiving initial display information of each pixel of an mth frame image, wherein the initial display information of each pixel comprises n initial gray scales under different hues, m and n are positive integers, and n is more than or equal to 2;

Determining the actual brightness of each backlight partition under n tones and the compensation parameters of each pixel according to the initial display information;

Controlling each backlight partition and the pixel to sequentially display n sub-field images with different hues according to the actual brightness of each backlight partition and the compensation parameter of each pixel so as to obtain the m-th frame image;

Determining the actual brightness of each backlight partition under n tones and the compensation parameters of each pixel according to the initial display information, wherein the method comprises the following steps:

determining initial backlight brightness of each backlight partition under n tones according to the initial display information, wherein the method comprises the following steps:

Determining pixel brightness according to the initial display information and a graying formula, wherein the graying formula is as follows:

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

Ls is the brightness of the pixel, R is the initial gray level of red, G is the initial gray level of green, B is the initial gray level 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;

and taking one of the pixels corresponding to the backlight subarea with the maximum pixel brightness as a target pixel, wherein the initial backlight brightness of the backlight subarea under one tone is the initial gray level of the target pixel under the same tone.

In one exemplary embodiment of the present disclosure, the amplifying the initial backlight brightness includes:

determining an expansion coefficient according to the maximum value of the initial backlight brightness under n tone and a preset corresponding relation;

calculating the product of the initial backlight brightness and the expansion coefficient under each tone.

In one exemplary embodiment of the present disclosure, determining the actual brightness and the equivalent backlight for each of the pixels according to the amplified backlight brightness comprises:

and scanning all the backlight partitions by using a filtering template, and filtering each backlight partition to obtain the actual brightness of each backlight partition, wherein the range of the filtering template covers a plurality of backlight partitions.

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

Under one of the subfield images:

The actual brightness of the target backlight partition is an average value of amplified backlight brightness determined by each backlight partition in the same filtering template based on the initial backlight brightness.

And determining the equivalent backlight of each pixel corresponding to the backlight partition according to the actual brightness, the position of the light emitting device in the backlight partition and the point diffusion curve.

According to an aspect of the present disclosure, there is provided an electronic apparatus including the liquid crystal display device described in any one of the above.

According to the liquid crystal display device, the image display method and the electronic equipment, the field sequence display can be realized by temporally mixing the n sub-field images which are sequentially displayed, a spatial color mixing mode is not needed, a color film is not needed, the light emitting efficiency can be improved, sub-pixels with different colors are not needed, and the resolution is improved.

In addition, in the first working mode, under one 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 larger than the initial backlight brightness determined based on the initial display information, so that overflow of compensation parameters of pixels can be avoided, the actual display brightness of the pixels is prevented from being lower than the original brightness, and the phenomenon of weakening color separation of the brightness is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a schematic structural diagram of an embodiment of a liquid crystal display device of the present disclosure.

Fig. 2 is a schematic circuit diagram of an embodiment of a liquid crystal display device of the present disclosure.

Fig. 3 is a partial schematic view of an mth frame image of the liquid crystal display device in the first operation mode.

Fig. 4 to 6 are schematic diagrams of three subfield images of the mth frame image in fig. 3.

Fig. 7 is a schematic diagram of an embodiment of an electronic device of the present disclosure.

Fig. 8 is a flowchart of an image processing method of the present disclosure.

Fig. 9 is a schematic diagram showing a relationship between maximum initial backlight brightness and expansion coefficient in the liquid crystal display device of the present disclosure.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

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 "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc., and the terms "first," "second," and "third," etc. are used merely as labels, and not as limitations on the number of objects thereof.

The embodiment of the present disclosure provides a liquid crystal display device, as shown in fig. 1 and 2, which may include a liquid crystal display panel and a control circuit CU, wherein:

the liquid crystal display panel may include a liquid crystal display substrate PNL and a backlight module BLU having a plurality of pixels distributed in an array, and the pixels are minimum display units. The liquid crystal display substrate PNL may include an array substrate TB, a counter substrate FB, and a liquid crystal layer LL disposed between the array substrate TB and the counter substrate FB.

The liquid crystal display substrate PNL further includes a pixel electrode and a common electrode. The pixel electrode may be disposed on the array substrate TB, the common electrode may be disposed 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 may be disposed on the array substrate TB, and may control a voltage between the pixel electrode and the common electrode through the driving circuit, thereby controlling a deflection degree of liquid crystal molecules of the liquid crystal layer LL, and further controlling transmittance of each pixel to light, so as to implement gray scale adjustment of each pixel.

The backlight module BLU may be disposed on a side of the array substrate TB away from the opposite substrate FB, and may emit light to the array substrate TB under the control of the control circuit CU.

In some embodiments, the opposite substrate FB may include a color film layer, the color film layer includes a plurality of light filtering portions, a pixel may include a light filtering portion, and through the filtering effect of the light filtering portion, one pixel emits monochromatic light, and the light emission colors of different pixels may be different. However, the color film layer causes a larger loss of light, and reduces the brightness of the liquid crystal display device without increasing the power of the backlight module BLU. However, if the brightness is to be increased, the power of the backlight module BLU needs to be increased, resulting in increased power consumption.

In order to improve the light extraction efficiency without improving the power consumption, in some embodiments, the opposite substrate FB may not be provided with a color film layer, so as to reduce the light loss, which is beneficial to improving the light extraction efficiency. In order to realize color display, the backlight module BLU may 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 herein and may be one or more. The color of the backlight module BLU emits light, namely the color of a formed picture, the backlight module BLU emits light to be used as a light source for displaying images, and the pixels can control the deflection state of the liquid crystal, so that the gray scale of the pixels is controlled, and the image display is realized through the cooperation of the backlight module BLU and the pixels.

On this basis, when displaying an image, for example, n sub-field images are sequentially displayed in a frame time, each sub-field image is a single-color image, the gray scales of different pixels in each sub-field image can be different, and the gray scales of the same pixel under different sub-field images can be different. The light emitting colors of the backlight module BLU are the same when displaying the same sub-field image, and the light emitting colors are different when displaying different sub-field images, for example, when displaying each sub-field image, only one light emitting device in the backlight module BLU emits light so that each sub-field image has only one color, i.e., one color. Thus, based on the persistence of vision, one frame of image can be obtained.

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

As shown in fig. 2, in some embodiments of the present disclosure, the control circuit CU may be configured to perform one or more modes of operation, including a first mode of operation in which:

The control circuit CU is configured to receive initial display information of each pixel of the mth frame image, and to control the brightness of each backlight partition and the gray scale of the pixel according to the initial display information, and to sequentially display n sub-field images of different hues to obtain the mth frame image. m and n are positive integers, n is more than or equal to 2.

The initial display information of each pixel may include an initial gray level at n hues, and for one pixel of one frame image, temporal color mixing may be realized by sequentially displaying the gray levels of n hues, so that the pixel exhibits a predetermined color. For example, n=3, and the 3 hues are red, green and blue, and the initial display information of each pixel of the mth frame image may include an initial gray level of red, an initial gray level of green and an initial gray level of blue.

Fig. 4 to 6 show three sub-field images, in which the pixels P that emit light form a plurality of stripe patterns, and the pixels that emit light in the different sub-field images may be different or may overlap, i.e., the same pixel may emit light in each sub-field image. The three sub-field images may form an mth frame image shown in fig. 3. It should be noted that fig. 3 is only for schematically showing the visual effect of color mixing and formation of three subfield images, and does not constitute a limitation of a specific pattern of subfield images.

In one embodiment, the backlight module BLU may include 3 kinds of light emitting devices, which may emit red light, green light, and blue light, respectively. One frame image may be divided into three sub-field images, the hues of the patterns of the three sub-field images are red, green and blue, respectively, and the three sub-field images are sequentially displayed, so that one frame image may be formed in visual effect.

As shown in fig. 2, the control circuit CU may be connected to the array substrate TB and the backlight module BLU, and is used for controlling the light emission of the backlight module BLU and controlling the deflection degree of the liquid crystal, i.e. controlling the color and gray scale of each pixel. The control circuit CU may include a timing controller, a gate driving circuit, a source driving circuit, a backlight control circuit, and the like, and the configuration thereof is not particularly limited herein.

The inventor finds that when field sequential display is adopted, as one frame of image needs to be mixed by a plurality of sub-field images which are not displayed at the same time, when a user blinks, scans or moves a target in a picture, three hues of red, green and blue can be observed in the picture at the same time, namely, a color separation phenomenon occurs.

The inventors found through studies 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, and the following is an exemplary description:

The control circuit CU can receive initial display information of an mth frame display image in a first working mode, m and n are positive integers, n is more than or equal to 2, the initial display information of each pixel comprises initial gray scales under n hues, and according to actual brightness of each backlight partition and compensation parameters of each pixel determined based on the initial display information, each backlight partition and each pixel are controlled to sequentially display sub-field images of n different hues so as to obtain the mth frame image. Under a subfield image, the same color light emitting devices of each backlight partition emit light, and the actual luminance of the backlight partition is greater than the initial backlight luminance determined based on the initial display information. The backlight partitions can be controlled to emit light with actual brightness, the gray scale of the pixels is controlled through compensation parameters, so that n field sequential images are obtained, one field sequential image is displayed, and the light emitting devices with the same color of each backlight partition emit light.

The actual brightness of the backlight partition is larger than the initial backlight brightness determined based on the initial display information, so that overflow of compensation parameters of pixels can be avoided, the actual display brightness of the pixels is prevented from being lower than the original brightness, and the phenomenon of color separation is weakened by improving the brightness.

The determination mode of determining the actual brightness and the compensation parameters according to the initial display information is described in detail:

First, an initial backlight luminance may be determined according to the initial display information, then an amplified backlight luminance may be determined according to the initial backlight luminance, and then an actual backlight luminance may be determined according to the amplified backlight luminance, as described in detail below:

After receiving the initial display information of the mth frame, the initial backlight brightness of each backlight partition at n hues may be determined according to the initial display information, that is, the initial backlight brightness of one pixel is n, for example, n=3, and the hues include red, green, and blue, and then the initial backlight brightness may include the initial backlight brightness of red, the backlight brightness of green, and the backlight brightness of blue, in the same frame image.

In some embodiments of the present disclosure, gray scale of initial display information of a pixel may be achieved according to a gray scale formula, to obtain brightness of the pixel, and the initial display information is converted into a brightness domain, for example, the gray scale formula is:

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 level of red, G is the initial gray level of green, and B is the initial gray level of blue. k1 is the weight of red in the luminance of the pixel, k2 is the weight of green in the luminance of the pixel, k3 is the weight of blue in the luminance of the pixel, k1 may be 0.3, k2 may be 0.6, and k3 may be 0.1.2.2 is the gamma value.

The initial backlight brightness is positively correlated with the initial gray level, and thus, when the maximum initial backlight brightness is selected, the maximum initial gray level is actually selected.

The initial backlight brightness for red is (R/255) ^2.2, blue and green or other colors are the same.

The method has the advantages that one of the pixels corresponding to one backlight partition with the largest pixel brightness can be used as a target pixel, the initial backlight brightness of one backlight partition under one color tone can be represented by the initial gray level of the target pixel under the one color tone, namely, for one backlight partition, the light emitting devices with the same color emit light in a field sequential image, the initial backlight brightness of the backlight partition under the one color tone can be represented by the initial gray level of the target pixel under the one color tone, the proportion relation of the initial gray levels of different colors can not be changed, and compared with the method for determining the initial backlight brightness in a nonlinear domain, the method is favorable for preventing color distortion.

Because the number of the light emitting devices of a backlight partition is smaller than the number of the pixels corresponding to the backlight partition, the light emitting devices are opposite to one pixel in the direction perpendicular to the liquid crystal display substrate, and part of the pixels are opposite to any light emitting device, the light emitting devices emit light to the non-opposite pixels at a certain included angle, and compared with the brightness of the light received by the opposite pixels, the brightness of the light obtained for the opposite pixels is reduced, namely attenuation exists, in order to avoid the brightness deficiency caused by the attenuation, the initial backlight brightness can be amplified after the initial backlight brightness is obtained, the amplified backlight brightness is obtained, and the brightness obtained by the non-opposite pixels is increased. For example:

For the initial display information of the m-th frame image, the maximum value of the initial backlight brightness under n tones can be determined for each initial gray level of the target pixel, and the expansion coefficient is determined according to the preset corresponding relation, and the product of the initial backlight brightness under each tone and the expansion coefficient is calculated to obtain the expanded backlight brightness, namely, each initial gray level of the target pixel is multiplied by the same expansion coefficient.

The above-described correspondence may include a relationship of the expansion coefficient and the maximum initial backlight luminance in n hues, and the expansion coefficient and the maximum initial backlight luminance of the target pixel in the mth frame image are inversely related, and the correspondence may be determined by experiments, empirical data, or the like, and it can be seen from the graph in fig. 9 that the larger the maximum initial backlight luminance, the smaller the expansion coefficient, the smaller the maximum initial backlight luminance, and the larger the expansion coefficient. Meanwhile, the expansion coefficient is greater than 1. If the initial backlight brightness is represented as 255 in gray scale, the expansion coefficient may be 1.

To improve the smoothness of the brightness of the different backlight partitions, the amplified backlight brightness of each backlight partition may be smoothed, for example:

The range of the filtering template covers a plurality of backlight partitions, the size of the filtering template can be limited by the number of the covered backlight partitions, for example, the size of the filtering template can be 3×3, namely, the filtering template can cover 9 backlight partitions, and the size of the filtering template can also be 4×4, namely, the filtering template can cover 16 backlight partitions. The backlight module can be divided into a plurality of filtering areas through the filtering template, the filtering areas are also moved when the scanning of the filtering template exists, and the adjacent filtering areas can be partially overlapped.

And (3) taking one of the backlight partitions in the filtering template range as a target backlight partition, and recalculating the backlight brightness of the target backlight partition by utilizing the amplified backlight brightness of each backlight partition to obtain the actual backlight brightness.

Further, the filtering process may be performed at each color tone, and the amplified backlight brightness at each color tone may be used to calculate the actual brightness of the backlight partition at that color tone. In a subfield image, the actual luminance of the target backlight partition is the average of the amplified backlight luminance determined for each backlight partition within the same filter template based on the initial backlight luminance.

Next, for a backlight partition in the mth frame image, the equivalent backlight obtained by each pixel in the tone may be determined according to the above-determined actual backlight brightness in the tone, and then the compensation parameters of each pixel may be determined according to the equivalent backlight, which is described in detail below:

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 which are opposite to the pixels and the positions of the light emitting devices which are not opposite to the pixels can be determined. Of course, the light emitting devices in the same backlight partition may not be opposite to the pixels, as long as the positions of the light emitting devices can be determined.

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 and the position of the light emitting device in the backlight partition, and the point spread curve (PSF curve). The point spread curve (PSF curve) may be predetermined by experimental and empirical data for representing a region and specific data where the luminance of light emitted from the light emitting device is attenuated with an increase in distance therefrom, and is not particularly limited herein.

The brightness of the light rays which can be actually obtained by each pixel can be reflected through the equivalent brightness, based on the brightness, the compensation parameters of the pixels can be determined, and the compensation parameters can be used for controlling the deflection state of liquid crystal, so that the image display is realized by matching with the backlight partition with the actual brightness.

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

;

BLpsf is equivalent brightness (shown in gray scale), LC is compensation parameter, and input is actual brightness (shown in gray scale).

Under each sub-field image, each backlight subarea emits light with an actual brightness, the pixels control gray scale with compensation parameters, the actual brightness of the backlight subareas of different sub-field images can be different, and the compensation parameters of the pixels can be different. For example, n=3, the hues of the field sequential display are three, i.e., red, green, and blue, and the actual luminance of each backlight partition and the compensation parameters of the pixel are also three, i.e., the actual luminance of the backlight partition and the compensation parameters of the pixel under the red sub-field image, the actual luminance of the backlight partition and the compensation parameters of the pixel under the green sub-field image, and the actual luminance of the backlight partition and the compensation parameters of the pixel under the blue sub-field image.

Based on the first liquid crystal display device described above, an image display method will be described below:

As shown in fig. 8, the image display method may include performing steps S110 to S130 in a first operation mode, wherein:

Step S110, receiving initial display information of each pixel of an mth frame image, wherein the initial display information of each pixel comprises n initial gray scales under different hues, m and n are positive integers, and n is more than or equal to 2.

Step S120, determining the actual brightness of each backlight partition under n hues and the compensation parameter of each pixel according to the initial display information.

In some embodiments of the present disclosure, determining actual color information of the pixel from the initial display information, i.e., step S120, may include steps S1210-S1240, wherein:

step S1210, determining initial backlight brightness of each backlight partition under n tones according to the initial display information;

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

step S1230, determining the actual brightness and the equivalent backlight of each pixel according to the amplified backlight brightness;

Step S1240, determining a compensation parameter of each pixel according to the equivalent backlight.

And step 130, controlling each backlight partition and each pixel to sequentially display n sub-field images with different hues according to the actual brightness of each backlight partition and the compensation parameter of each pixel so as to obtain the m-th frame image.

Under one of the subfield 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.

Details of the image display method are described in the above embodiments of the liquid crystal display device, and are not described herein.

In addition, in some embodiments of the present disclosure, the control circuit CU further includes a second operation mode, and is configured in the second operation mode to control the liquid crystal display device to sequentially display n sub-field images according to the actual brightness of each backlight partition and the compensation parameter of each pixel determined based on the initial display information, to obtain the mth frame image, where m and n are positive integers, and n is greater than or equal to 2, if the initial display information of the mth frame image is received. The actual color information of each pixel is the initial display information, and the actual gray scale is the initial gray scale.

In the second operation mode, the actual brightness of a backlight partition may directly use the initial backlight brightness determined based on an initial gray level, so that the above expansion process, the filtering process, and the process of determining the compensation parameter of the initial backlight brightness may be performed normally.

The first working mode and the second working mode can be started when receiving the starting signal, for example, the image acquisition device can be used for acquiring the image of the eyeball of the user, the image processing device can be used for determining the moving speed of the eyeball according to the image of the eyeball, and when the moving speed reaches the speed threshold, the color separation phenomenon is obvious, and at the moment, the control circuit CU can be in the first working mode to eliminate the color separation. When the moving speed does not reach the speed threshold, the color separation phenomenon may not be obvious, and at this time, the control circuit CU may be in the second operation mode, thereby improving the operation efficiency.

Embodiments of the present disclosure provide an electronic device, which may include a liquid crystal display device, and the structure of the liquid crystal display device may be any of the liquid crystal display devices of the foregoing embodiments, which is not described herein.

As shown in fig. 7, the electronic device further includes an image acquisition device and an image processing device, wherein:

The image acquisition device CAM may comprise one or more cameras, although other devices for acquiring image information such as characteristic information of a human body or an object may be used. The image acquisition device CAM can acquire images of the eyeballs of the user in real time.

The image processing device CP may be connected to the image capturing device CAM, which may determine a movement speed of the eyeball according to the image of the eyeball, and when the movement speed reaches a speed threshold, output a start signal to the control circuit CU, so that the control circuit CU is in the first operation mode. When the movement speed does not reach the speed threshold, no start signal is output and the control circuit CU is in the second mode of operation.

The image processing device CP can recognize the pupil center from the image of the eyeball, and determine the movement speed of the eyeball from the change in the position of the pupil center.

In some embodiments, the electronic device may further include an infrared detection device, which may locate a cornea center of the user by infrared light, where a line connecting the cornea center and a pupil center identified by the image processing device is an optical axis of the vision system, and then a real line of sight direction may be obtained according to an included angle between the optical axis and the visual axis. In addition, the eye tracking device can also comprise a hot mirror for reducing tracking errors on the basis of not influencing the picture display, or an optical waveguide for transmitting infrared light and eye images.

In addition, the eye tracking may be achieved by other means, and is not particularly limited herein.

The electronic device of the present disclosure 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.

It should be noted that although the various steps of the image display method of the present disclosure are depicted in a particular order in the figures, this does not require or imply that the steps must be performed in that particular order or that all of the illustrated steps be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A liquid crystal display device, characterized in that it 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 substrate comprises a plurality of pixels, the backlight module comprises a plurality of backlight zones, and each of the backlight zones comprises a light-emitting device of n colors;

The control circuit includes a first operating mode, and is configured in the first operating mode 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 hues based on the actual brightness of each backlight partition determined based on the initial display information and the 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 gray levels under n hues;

Under one of the subfield images, light-emitting devices of the same color in each of the backlight zones emit light, and the actual brightness of the backlight zone is greater than the initial backlight brightness determined based on the initial display information;

The method for determining the compensation parameters includes:

The initial backlight brightness of each backlight zone under n color tones is determined based on the initial display information;

The initial backlight brightness is amplified to obtain amplified backlight brightness;

The actual brightness and the equivalent backlight of each pixel are determined based on the amplified backlight brightness.

The compensation parameters for each pixel are determined based on the equivalent backlight.

2. The liquid crystal display device according to claim 1, wherein the liquid crystal display panel can be divided into multiple filtering regions by a filtering template, a filtering region includes multiple backlight partitions, and a backlight partition within the filtering region is a target backlight partition;

Under one of the subfield images:

The actual brightness of the target backlight zone is the average value of the amplified backlight brightness determined by each backlight zone within the same filtering area based on the initial backlight brightness;

The amplified backlight brightness of the backlight zone is the product of the initial backlight brightness of the backlight zone and an amplification factor.

3. The liquid crystal display device according to claim 2, characterized in that, under one of the subfield images:

The initial backlight brightness is one of the initial gray levels of the pixel with the maximum pixel brightness among the pixels corresponding to the backlight partition;

The pixel brightness of a pixel is obtained by grayscale conversion of the initial grayscale of its initial display information.

4. The liquid crystal display device according to claim 3, wherein n=3, and the hue includes red, green, and blue;

In the m-th frame of the 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 gray level of red, G is the initial gray level of green, and B is the initial gray level of blue; k1 is the weight of red in the pixel brightness, k2 is the weight of green in the pixel brightness, and k3 is the weight of blue in the pixel brightness.

5. The liquid crystal display device according to claim 4, wherein the pixel with the highest brightness among the pixels corresponding to a backlight partition is the target pixel of the backlight partition; and the initial backlight brightness of a backlight partition is the largest among the initial gray levels of the initial display information of the target pixel.

6. The liquid crystal display device according to claim 5, wherein the amplification factor 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 1-6, wherein the control circuit further comprises a second operating mode, and is configured in the second operating mode to: receive the initial display information of the m-th frame image, and control the liquid crystal display device to sequentially display n sub-field images according to the actual brightness of each of the backlight zones and the compensation parameters of each of the pixels determined based on the initial display information, so as to obtain the m-th frame image;

In a subfield image of the second working mode, light-emitting devices of the same color in each of the backlight zones emit light, and the actual brightness of the backlight zone is the same as the initial backlight brightness determined based on an initial grayscale.

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

The array substrate and the opposing substrate are arranged opposite each other;

A liquid crystal layer is disposed between the array substrate and the opposing substrate;

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

9. An image display method, characterized in that it is used in a liquid crystal display device, the liquid crystal display device comprising a liquid crystal display panel and a control circuit, the liquid crystal display panel comprising a liquid crystal display substrate and a backlight module; the liquid crystal display panel comprising a plurality of pixels, the backlight module comprising a plurality of backlight zones, each of the backlight zones comprising n light-emitting devices of different colors; the image display method comprising:

In the first working mode:

Receive the initial display information of each pixel in the m-th frame image; the initial display information of each pixel includes n initial gray levels under different hues; m and n are positive integers, n≥2;

The actual brightness of each backlight zone under n color tones and the compensation parameters of each pixel are determined based on the initial display information.

Based on the actual brightness of each backlight zone and the compensation parameters of each pixel, control each backlight zone and the pixel to sequentially display n subfield images with different hues to obtain the m-th frame image;

Based on the initial display information, determine the actual brightness of each backlight zone in n color tones and the compensation parameters of each pixel; including:

10. The image display method according to claim 9, wherein n=3, and the hue includes red, green, and blue;

Determine the initial backlight brightness of each backlight zone under n color tones based on the initial display information; including:

The pixel brightness is determined based on the initial display information and the grayscale formula, whereby the grayscale formula is:

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

The pixel with the highest brightness among the pixels corresponding to a backlight partition is taken as the target pixel, and the initial backlight brightness of a backlight partition under a certain hue is the initial gray level of the target pixel under the same hue.

11. The image display method according to claim 10, characterized in that, the initial backlight brightness is amplified; comprising:

The amplification factor is determined based on the maximum value of the initial backlight brightness under the n hues and the preset correspondence.

Calculate the product of the initial backlight brightness and the amplification factor for each of the aforementioned color tones.

12. The image display method according to claim 9, characterized in that determining the actual brightness and the equivalent backlight of each pixel based on the magnified backlight brightness; comprising:

The filter template is used to scan all the backlight zones, and each backlight zone is filtered to obtain the actual brightness of each backlight zone; the range of the filter template covers multiple backlight zones.

13. The image display method according to claim 12, wherein one of the backlight partitions within the coverage area of the filter template is a target backlight partition;

Under one of the subfield images:

The actual brightness of the target backlight zone is the average value of the amplified backlight brightness determined by each backlight zone within the same filter template based on the initial backlight brightness.

14. The image display method according to claim 13, characterized in that determining the actual brightness and the equivalent backlight of each pixel based on the magnified backlight brightness; comprising:

The equivalent backlight of each pixel corresponding to the backlight partition is determined based on the actual brightness, the position of the light-emitting device in the backlight partition, and the dot diffusion curve.

15. An electronic device, characterized in that it includes the liquid crystal display device according to any one of claims 1-8.