Liquid crystal display device based on field order and color image display method

Abstract

The invention relates to the technical field of liquid crystal display, and provides liquid crystal display equipment based on a field order and a color image display method. An image to be displayed can be decomposed into three sub-frames based on a field sequential display technology, each sub-frame corresponds to a color field, when a liquid crystal panel is driven according to a main color gray scale value of the color field corresponding to each sub-frame, at least one backlight source corresponding to each color field is firstly driven to emit backlight of a first duration within a time period when liquid crystal molecules reach a steady state, and then the backlight source corresponding to each color field is driven to emit backlight of a second duration within a time period when the liquid crystal molecules reach the steady state. The white light of the second duration is emitted after the first duration, so that the white light is added in the backlight lightening stage of each color field, the color gamut range of the color field corresponding to each sub-frame is effectively reduced, and the color separation phenomenon is reduced. In addition, each subframe corresponds to a single color field or a mixed color field, so that the color separation phenomenon in various algorithms can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal display, and provides a field sequential liquid crystal display device and a color image display method. BACKGROUND

[0002] With the development of liquid crystal display (LCD) towards large size and ultra-high definition, the requirement for power consumption is higher and higher. Field sequential color display technology has broad application potential due to its low power consumption advantage, and is concerned by the industry.

[0003] Field sequential color display is a new type of color display mode. The backlight module adopts RGB backlight. In one field time (i.e. the display period of one frame of image, usually the reciprocal of the refresh rate of the liquid crystal display screen), the backlight of R (red), G (green) and B (blue) three primary colors is refreshed in turn, and the transmittance of each backlight is adjusted by the liquid crystal driving layer, so that different color sub-images are displayed on the liquid crystal display screen in turn. By using the lag effect of human eyes, the fusion of three color sub-images in time is realized. In this way, three frames of sub-images are finally synthesized into a color image in human eyes, and the display principle is as shown in Figure 1

[0004] In field sequential color display, due to the rotation of eyeball, the RGB components of the pixel point displayed in time at the same point in one field time will fall on different positions on the retina. Therefore, the viewer usually perceives the separation of colors at the edge of the displayed image, i.e. color breakup phenomenon, thereby reducing the quality of the displayed image, and easily causing visual fatigue of the viewer and affecting the viewing experience.

[0005] Therefore, it is of great research significance for liquid crystal display device to solve the color breakup phenomenon. SUMMARY

[0006] The embodiments of the present application provide a field sequential liquid crystal display device and a color image display method, which are used to solve the color breakup phenomenon.

[0007] In a first aspect, the embodiments of the present application provide a field sequential liquid crystal display device, comprising:

[0008] a liquid crystal panel;

[0009] a backlight module, the backlight module comprising a red backlight source, a green backlight source, a blue backlight source and a white backlight source;

[0010] a processor configured to:

[0011] ​The image to be displayed is divided into a first subframe, a second subframe, and a third subframe, wherein the first subframe corresponds to a first color field, the second subframe corresponds to a second color field, and the third subframe corresponds to a third color field, and the first color field, the second color field, and the third color field are mixed color fields or monochrome fields;

[0012] The liquid crystal panel is driven according to the primary color grayscale value of the first color field corresponding to the first subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a first backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration.

[0013] The liquid crystal panel is driven according to the primary color grayscale value of the second color field corresponding to the second subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a second backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration.

[0014] The liquid crystal panel is driven according to the primary color grayscale value of the third color field corresponding to the third subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the third color field is driven to emit a third backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration.

[0015] The beneficial effects of the above technical solution are as follows: In a field-sequence-based liquid crystal display device, the image to be displayed can be decomposed into three sub-frames, each sub-frame corresponding to a color field. The color field can be a monochromatic field or a mixed-color field. A monochromatic field corresponds to a backlight of one color, while a mixed-color field corresponds to a backlight of at least two colors, thus improving color separation in various algorithms. Furthermore, when driving the liquid crystal panel according to the grayscale value of the primary color of the color field corresponding to each sub-frame, during the period when the liquid crystal molecules reach a steady state, at least one backlight corresponding to each color field is first driven to emit backlight for a first duration. Then, after the first duration, a white backlight is driven to emit white light for a second duration. This adds white light during the backlight illumination stage of each color field, effectively reducing the color gamut range of the color field corresponding to each sub-frame, thereby mitigating color separation. In addition, emitting white light through an additional white backlight improves the luminous efficiency of the white light.

[0016] Optionally, the processor is configured to drive the white backlight to emit white light for a second duration after the first duration, including:

[0017] After a first duration corresponding to each color field, the backlight module is driven to emit white light for the same second duration at a set backlight value.

[0018] The beneficial effects of the above technical solution are as follows: when the white backlight is fully illuminated, without the need for dimming, by controlling the addition of white light of the same second duration to each color field, the color gamut of the three primary colors R, G, and B is compressed proportionally, thereby reducing color separation and color shift problems.

[0019] Optionally, the backlight module is divided into multiple backlight zones, each backlight zone corresponding to an image block in the image to be displayed;

[0020] The processor is configured to drive the white backlight to emit white light for a second duration after the first duration, including:

[0021] Based on the primary color grayscale value of the color field corresponding to each subframe of the image block corresponding to the backlight partition, calculate the first backlight value of at least one backlight source corresponding to each color field.

[0022] The second backlight value of the white backlight corresponding to each color field is determined based on the first backlight value of at least one backlight corresponding to each color field and the preset addition ratio.

[0023] After the first duration of each color field, at least one of the following is determined based on the second backlight value of the white backlight: the second duration of driving the white backlight within the backlight zone, the duration percentage, and the driving voltage.

[0024] The beneficial effects of the above technical solution are as follows: When adding white light in a local dimming scene, the amount of white light added can be controlled from three aspects: duration, duration ratio, and driving voltage. Among them, the second backlight value of white light is the product of the first backlight value and the preset addition ratio, thereby ensuring that the color fields corresponding to the three sub-frames contained in each image block are added with an equal amount of white light, realizing the dynamic compression of the color gamut range with the content of the image block, reducing color separation phenomenon while improving image display quality.

[0025] Optionally, the second backlight value of the white backlight source is less than the first backlight value of at least one backlight source corresponding to each color field.

[0026] The beneficial effects of the above technical solution are: avoiding excessive sacrifice of the color gamut range of the three primary colors and ensuring image display quality.

[0027] Secondly, embodiments of this application provide a field-sequence-based liquid crystal display device, comprising:

[0028] LCD panel;

[0029] A backlight module, comprising a red backlight source, a green backlight source, a blue backlight source, and a white backlight source;

[0030] The processor is configured as follows:

[0031] The image to be displayed is divided into a first subframe, a second subframe, and a third subframe, wherein the first subframe corresponds to a first color field, the second subframe corresponds to a second color field, and the third subframe corresponds to a third color field, and the first color field, the second color field, and the third color field are mixed color fields or monochrome fields;

[0032] The liquid crystal panel is driven according to the primary color grayscale value of the first color field corresponding to the first subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a first backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up at the same time so that the three backlights emit white light for a second duration.

[0033] The liquid crystal panel is driven according to the primary color grayscale value of the second color field corresponding to the second subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the second color field is driven to emit a second backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up at the same time so that the three backlights emit white light for a second duration.

[0034] The liquid crystal panel is driven according to the primary color grayscale value of the third color field corresponding to the third subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the third color field is driven to emit a third backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up simultaneously so that the three backlights emit white light for a second duration.

[0035] The beneficial effects of the above technical solution are as follows: In a field-sequence-based liquid crystal display device, the image to be displayed can be decomposed into three sub-frames, each sub-frame corresponding to a color field. The color field can be a monochromatic field or a mixed color field. A monochromatic field corresponds to a backlight of one color, while a mixed color field corresponds to a backlight of at least two colors, thus improving color separation in various algorithms. Furthermore, when driving the liquid crystal panel according to the primary color grayscale value of the color field corresponding to each sub-frame, during the period when the liquid crystal molecules reach a steady state, at least one backlight corresponding to each color field is first driven to emit backlight for a first duration. Then, after the first duration, the red, green, and blue backlights are simultaneously lit to emit white light for a second duration. This adds white light during the backlight illumination stage of each color field, effectively reducing the color gamut range of the color field corresponding to each sub-frame, thereby mitigating color separation. In addition, emitting white light through three primary color backlights effectively saves on the hardware cost of the backlight module.

[0036] Optionally, the processor is configured to simultaneously illuminate the red backlight, the green backlight, and the blue backlight after the first duration, so that the three backlights emit white light for a second duration, including:

[0037] After a first duration corresponding to each color field, the red backlight, the green backlight, and the blue backlight are simultaneously illuminated with a set backlight brightness value to emit white light for the same second duration.

[0038] The beneficial effects of the above technical solution are as follows: when the white backlight is fully illuminated, without the need for dimming, by controlling the addition of white light of the same second duration to each color field, the color gamut of the three primary colors R, G, and B is compressed proportionally, thereby reducing color separation and color shift problems.

[0039] Optionally, the backlight module is divided into multiple backlight zones, each backlight zone corresponding to an image block in the image to be displayed;

[0040] The processor is configured to simultaneously illuminate the red backlight, the green backlight, and the blue backlight after the first duration, so that the three backlights emit white light for a second duration, including:

[0041] Based on the primary color grayscale value of the color field corresponding to each subframe of the image block corresponding to the backlight partition, calculate the first backlight value of at least one backlight source corresponding to each color field.

[0042] Based on the first backlight value of at least one backlight source corresponding to each color field and a preset addition ratio, determine the second backlight value of the red backlight source, the green backlight source and the blue backlight source corresponding to each color field;

[0043] After the first duration of each color field, at least one of the following is determined based on the second backlight value: the second duration, duration ratio, and driving voltage of the red backlight, green backlight, and blue backlight within the backlight zone.

[0044] The beneficial effects of the above technical solution are as follows: When adding white light in a local dimming scene, the amount of white light added can be controlled from three aspects: duration, duration ratio, and driving voltage. Among them, the second backlight value of white light is the product of the first backlight value and the preset addition ratio, thereby ensuring that the color fields corresponding to the three sub-frames contained in each image block are added with an equal amount of white light, realizing the dynamic compression of the color gamut range with the content of the image block, reducing color separation phenomenon while improving image display quality.

[0045] Optionally, the second backlight value of the red backlight, the green backlight, or the blue backlight is less than the first backlight value of the corresponding color of the backlight in at least one backlight corresponding to each color field within the first time period.

[0046] The beneficial effects of the above technical solution are: avoiding excessive sacrifice of the color gamut range of the three primary colors and ensuring image display quality.

[0047] Thirdly, embodiments of this application provide a method for displaying a color image, comprising:

[0048] The image to be displayed is divided into a first subframe, a second subframe, and a third subframe, wherein the first subframe corresponds to a first color field, the second subframe corresponds to a second color field, and the third subframe corresponds to a third color field, and the first color field, the second color field, and the third color field are mixed color fields or monochrome fields;

[0049] The liquid crystal panel is driven according to the primary color grayscale value of the first color field corresponding to the first subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a first backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration.

[0050] The liquid crystal panel is driven according to the primary color grayscale value of the second color field corresponding to the second subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a second backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration.

[0051] The liquid crystal panel is driven according to the primary color grayscale value of the third color field corresponding to the third subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the third color field is driven to emit a third backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration.

[0052] Optionally, driving the white backlight to emit white light for a second duration after the first duration includes:

[0053] After a first duration corresponding to each color field, the backlight module is driven to emit white light for the same second duration at a set backlight value.

[0054] Optionally, the backlight module is divided into multiple backlight zones, each backlight zone corresponding to an image block in the image to be displayed;

[0055] The step of driving the white backlight to emit white light for a second duration after the first duration includes:

[0056] Based on the primary color grayscale value of the color field corresponding to each subframe of the image block corresponding to the backlight partition, calculate the first backlight value of at least one backlight source corresponding to each color field.

[0057] The second backlight value of the white backlight corresponding to each color field is determined based on the first backlight value of at least one backlight corresponding to each color field and the preset addition ratio.

[0058] After the first duration of each color field, at least one of the following is determined based on the second backlight value of the white backlight: the second duration of driving the white backlight within the backlight zone, the duration percentage, and the driving voltage.

[0059] Optionally, the second backlight value of the white backlight source is less than the first backlight value of at least one backlight source corresponding to each color field.

[0060] Fourthly, embodiments of this application provide a method for displaying a color image, comprising:

[0061] The image to be displayed is divided into a first subframe, a second subframe, and a third subframe, wherein the first subframe corresponds to a first color field, the second subframe corresponds to a second color field, and the third subframe corresponds to a third color field, and the first color field, the second color field, and the third color field are mixed color fields or monochrome fields;

[0062] The liquid crystal panel is driven according to the primary color grayscale value of the first color field corresponding to the first subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a first backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up at the same time so that the three backlights emit white light for a second duration.

[0063] The liquid crystal panel is driven according to the primary color grayscale value of the second color field corresponding to the second subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the second color field is driven to emit a second backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up at the same time so that the three backlights emit white light for a second duration.

[0064] The liquid crystal panel is driven according to the primary color grayscale value of the third color field corresponding to the third subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the third color field is driven to emit a third backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up simultaneously so that the three backlights emit white light for a second duration.

[0065] Optionally, the step of simultaneously illuminating the red backlight, the green backlight, and the blue backlight after the first duration to make the three backlights emit white light for a second duration includes:

[0066] After a first duration corresponding to each color field, the red backlight, the green backlight, and the blue backlight are simultaneously illuminated with a set backlight brightness value to emit white light for the same second duration.

[0067] Optionally, the backlight module is divided into multiple backlight zones, each backlight zone corresponding to an image block in the image to be displayed;

[0068] The step of simultaneously illuminating the red backlight, the green backlight, and the blue backlight after the first duration, so that the three backlights emit white light for a second duration, includes:

[0069] Based on the primary color grayscale value of the color field corresponding to each subframe of the image block corresponding to the backlight partition, calculate the first backlight value of at least one backlight source corresponding to each color field.

[0070] Based on the first backlight value of at least one backlight source corresponding to each color field and a preset addition ratio, determine the second backlight value of the red backlight source, the green backlight source and the blue backlight source corresponding to each color field;

[0071] After the first duration of each color field, at least one of the following is determined based on the second backlight value: the second duration, duration ratio, and driving voltage of the red backlight, green backlight, and blue backlight within the backlight zone.

[0072] Optionally, the second backlight value of the red backlight, the green backlight, or the blue backlight is less than the first backlight value of the corresponding color of the backlight in at least one backlight corresponding to each color field within the first time period.

[0073] Fifthly, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions that, when executed, can implement the steps of the above-described color image display method.

[0074] The technical effects of any of the implementation methods in the third to fifth aspects can be found in the technical effects of the corresponding implementation methods in the first and second aspects, and will not be repeated here. Attached Figure Description

[0075] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0076] Figure 1 A schematic diagram of field-sequenced color display provided for an embodiment of this application;

[0077] Figure 2 This is a schematic diagram of the process of field-sequence color display provided in an embodiment of this application;

[0078] Figure 3 A schematic diagram illustrating the color gamut range of different algorithms provided in the embodiments of this application;

[0079] Figure 4A A schematic diagram illustrating the backlight control process before and after adding white light, provided in an embodiment of this application;

[0080] Figure 4B This is a schematic diagram of color gamut compression of the three primary colors after adding white light, provided in an embodiment of this application.

[0081] Figure 4C A brightness comparison diagram before and after adding white light is provided for an embodiment of this application;

[0082] Figure 5This is a schematic diagram of the hardware configuration of a liquid crystal display device provided in an embodiment of this application;

[0083] Figure 6 A flowchart illustrating a method for displaying color images using a field-sequence-based liquid crystal display device;

[0084] Figure 7A A timing diagram for backlight control of adding white light to a monochromatic field using a white backlight, provided as an embodiment of this application;

[0085] Figure 7B A timing diagram for backlight control of adding white light to a color mixing field using a white backlight, provided for an embodiment of this application;

[0086] Figure 8 Flowchart of a method for displaying color images in another field-sequence-based liquid crystal display device;

[0087] Figure 9A A backlight control timing diagram for adding white light to a monochromatic field using a three-primary-color backlight, provided for an embodiment of this application;

[0088] Figure 9B A backlight control timing diagram for adding white light to a color mixing field using a three-primary-color backlight, provided for an embodiment of this application;

[0089] Figure 10 This is a system architecture diagram for color image display provided in an embodiment of this application. Detailed Implementation

[0090] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this application. Obviously, the described embodiments are only some embodiments of the technical solutions of this application, and not all embodiments. Based on the embodiments recorded in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the technical solutions of this application.

[0091] Based on the exemplary embodiments shown in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application. Furthermore, although the disclosures in this application are presented by way of one or more exemplary examples, it should be understood that each aspect of these disclosures can constitute a complete technical solution on its own.

[0092] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0093] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities and do not necessarily imply a specific order or sequence, unless otherwise indicated. It should be understood that such terms can be used interchangeably where appropriate, for example, to implement the application in a sequence other than those given in the embodiments illustrated or described herein.

[0094] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclusively include, for example, a product or device that includes a series of components is not necessarily limited to those that are explicitly listed, but may include other components that are not explicitly listed or that are inherent to such product or device.

[0095] As used in this application, the term "module" means any known or subsequently developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code capable of performing the functions associated with that element.

[0096] When LCD devices employ field-sequential color display technology, the RGB backlighting of the backlight module allows for customized color gamut and brightness settings, resulting in higher color saturation. Furthermore, since field-sequential color display eliminates the need for a color filter (CF), the light transmittance of the display module can be increased to approximately three times, effectively reducing LCD power consumption.

[0097] like Figure 2 The diagram shows the principle of the field-sequential color display method. This method divides a color image into sub-frames representing the three primary colors (R, G, and B) and displays them sequentially. These three sub-frames divide the display cycle of a single image into three time periods. The display process for each sub-frame is identical, mainly including three stages: data loading, liquid crystal response, and backlight illumination. To ensure accurate grayscale display, the backlight module is typically turned off during the liquid crystal response stage of the three sub-frames (backlight black insertion). During the backlight illumination stage, the backlight module sequentially refreshes the backlight sources for the three primary colors (R, G, and B). The liquid crystal panel displays the sub-images of the three color fields in a time-division manner based on the transmittance of each color field. Utilizing the hysteresis effect of the human eye, these three sub-images are ultimately synthesized into a color image in the human eye.

[0098] However, in field-sequential color displays, due to eye movement, the R, G, and B components of the same pixel displayed in time-sequential mode will fall on different positions on the retina, resulting in color separation, such as... Figure 2 As shown, this not only reduces image quality but also easily causes visual fatigue for viewers.

[0099] To suppress color separation, related technologies have improved the RGB backlighting method for field-sequential color displays. Table 1 shows three common field-sequential color display methods, and their color gamut ranges are as follows: Figure 3 As shown.

[0100] Table 1. Common Field Sequence Color Display Methods

[0101]

[0102] Among them, the RGB algorithm uses a single color field of R, G, and B colors to refresh the backlight of the three primary colors. It has poor color separation but low computational cost, and because of its large color gamut, it hardly produces color shift. Compared with the RGB algorithm, the Stencil algorithm can alleviate color separation by adding a mixed color field, but the color gamut (represented by a dashed triangle) becomes smaller, causing some colors outside the dashed triangle to not be displayed correctly and resulting in color distortion. The Local Primary Desaturation (LPD) algorithm desaturates the primary colors of each backlight zone. By precisely controlling the unsaturated backlight that exceeds the color gamut of the image content (represented by a dashed triangle), it can reproduce the image almost without distortion. However, for image content with rich colors, the color gamut is hardly compressed, resulting in poor color separation suppression effect.

[0103] In view of this, embodiments of this application provide a field-sequence-based liquid crystal display device and a method for displaying color images. For the backlight illumination stage of the color field corresponding to each subframe, after at least one backlight source corresponding to each color field emits backlight for a first duration, the backlight module is controlled to emit white light for a second duration to compress the original color gamut range of the three primary colors R, G, and B of the pixel, thereby reducing the color separation phenomenon with a slight sacrifice of color gamut.

[0104] exist Figure 2 As shown, the data loading phase takes up very little time within the time period of each subframe, and can be ignored.

[0105] For example, if the refresh rate of the three subframes is 240Hz, then the time period occupied by each subframe is 4.16ms. Assuming that the liquid crystal response stage time is 2ms, then the backlight brightness stage time is 2.16ms.

[0106] In field-sequential color display technology, there are two main options for adding white light to the backlight module: adding it during the liquid crystal response phase or during the backlight illumination phase. However, because the transmittance of liquid crystal molecules is variable and unstable during the liquid crystal response phase, and pixels transition between different grayscale values ​​during continuous frame switching, the liquid crystal response curve changes with the grayscale values ​​of frames before and after G2G (gray to gray). This can lead to different brightness ratios of white light added, even if the time for adding white light in the color fields corresponding to the three subframes is the same. Ensuring an equal amount of white light added to the three color fields requires complex processing. In contrast, the grayscale values ​​during the backlight illumination phase are stable, and the liquid crystal molecules are in a stable state, making it easier to control the amount of white light added. Therefore, this embodiment chooses to add white light during the backlight illumination phase.

[0107] Taking the RGB algorithm as an example, such as Figure 4A The diagram shows the backlight control process of the backlight module before and after the addition of white light according to the embodiment of this application. In the backlight bright spot stage of each subframe, equal amounts of white light are added without difference after the R, G, and B color fields. The time of the backlight bright spot stage of each subframe remains unchanged before and after the addition of white light.

[0108] In some embodiments, during the backlight illumination stage of the color fields corresponding to the three subframes, the amount of white light added to each color field is equal, thereby achieving proportional compression of the color coordinates of the three primary colors R, G, and B, thus alleviating the color separation problem while reducing the color shift problem.

[0109] Taking the RGB algorithm as an example, such as Figure 4B As shown, during the backlighting phase of the three subframes, after the corresponding color fields are backlit, an equal amount of white light is added to each, which is equivalent to compressing the original color coordinates of the three primary colors R, G, and B to R', G', and B'. The color saturation of the image after color gamut compression is reduced proportionally, and the color gamut is reduced, thereby alleviating the color separation problem. However, since the hue does not change, the color does not shift, and there is no color shift problem.

[0110] This embodiment adds white light to the color field corresponding to each subframe, thus increasing the brightness of the color fields corresponding to all three subframes. Figure 4C As shown, this reduces the percentage difference in brightness between the three color fields, thereby improving flicker.

[0111] If the proportion of white light added during the backlight illumination stage of the color field corresponding to each subframe is too high, the color gamut specification of the final displayed image will not meet the standard. If the proportion added is too low, the improvement of color separation will be limited. Therefore, it is necessary to reasonably control the proportion of white light added.

[0112] In some embodiments, the proportion of white light added in the color fields corresponding to the three subframes can be flexibly set according to the display requirements in the actual application scenario, and this application embodiment does not impose any limiting requirements.

[0113] After configuring the preset addition ratio, the white backlight can be driven from two perspectives: time duty cycle and drive amplitude.

[0114] In some embodiments, considering that the backlight module generally uses pulse width modulation (PWM) dimming, the adjustment time duty cycle can be given priority to control the proportion of white light added during the backlight lighting phase of the three subframes.

[0115] For example, assuming the preset addition ratio of white light is 10%, and the time for the liquid crystal response stage and backlight illumination stage of each subframe is 4.16ms, then the second duration is 4.16 * 0.1 = 0.416ms.

[0116] In the application scenarios of this application, the liquid crystal display device can be a smart TV with a liquid crystal display screen, a laser projector, a monitor, an electronic whiteboard, an electronic desktop, and a shopping mall navigation machine, etc.

[0117] It should be noted that the liquid crystal display devices in the embodiments of this application include, but are not limited to, the devices described above, and these devices are not intended to limit the embodiments of this application. Furthermore, the device type, size, specifications, etc., of the liquid crystal display devices described in the embodiments of this application are not limited.

[0118] The embodiments of this application are described below with reference to the accompanying drawings.

[0119] Figure 5 The hardware configuration diagram of a liquid crystal display device provided in this application embodiment mainly includes a liquid crystal panel 501, a backlight module 502, a processor 503, a driver board 504, a power supply board 505, a high voltage board 506, a key control board 507, and an audio / video signal input interface 508.

[0120] The LCD panel 501 includes a display screen assembly for displaying color images and a driving assembly for driving the image display, as well as a component for receiving image signals, displaying video, images, and a menu control interface, and a user control UI interface.

[0121] The liquid crystal display device in this embodiment of the application displays colors based on the field-sequential color display method. Within the display cycle of one frame of image, the display effect of color image is achieved through the cooperation of RGB backlight and display screen components. Therefore, the liquid crystal panel 501 of the liquid crystal display device using field-sequential color display does not include a color filter. The reason why the traditional spatial color mixing method requires a color filter is that the spatial color mixing method requires a color filter to combine the three sub-pixels R\G\B into one pixel to display color, so a color filter is required.

[0122] The backlight module 502 consists of a backlight source, a light guide plate, a substrate, and other components such as a light-transmitting film, and is used to provide backlight for the liquid crystal panel 501, thereby displaying clear color images.

[0123] The processor 503 may include at least one of a CPU, a video processor, an audio processor, a graphics processing unit (CPG), random access memory (RAM), read-only memory (ROM), a first to nth interface for input / output, a communication bus, etc. It can control the operation of the liquid crystal display device and respond to various user operations through various stored software programs.

[0124] The processor 503 may include one or more central processing units (CPUs), GPUs, or digital processing units, etc.

[0125] The driver board 504 typically includes components such as driver chips and logic circuits, and is used to control the display of the LCD panel 501. It obtains audio and video signals from the audio and video signal input interface 508, processes the audio and video input signals, and sends them to the LCD panel 501 in a specific manner, so that the LCD panel 501 can display color images.

[0126] The power board 505 is used to provide power to the components in the liquid crystal display device so that the components can work properly.

[0127] The high-voltage board 506 is an important component of the liquid crystal display device. It is a board that carries high-voltage power. In the liquid crystal panel 501, the function of the high-voltage board 506 is to convert the low-voltage power supply into a high-voltage power supply to provide enough electrons to drive the display of the liquid crystal panel 501. That is, it is used to light up the backlight in the liquid crystal display device so that the liquid crystal panel 501 can display the completed image under the illumination of the light source.

[0128] The keypad 507 is used to receive the user's key signals and send them to the processor 503, etc. The keypad 507 usually includes components such as key switches and interface cables.

[0129] In the embodiments of this application, the various hardware components of the liquid crystal display device can be connected by a bus, which can be divided into address bus, data bus, control bus, etc.

[0130] In one embodiment, the backlight module 502 includes a red backlight, a green backlight, a blue backlight, and a white backlight. The backlight module emits white light through the additional white backlight, which can improve the luminous efficiency of the white light.

[0131] like Figure 6 The diagram shows a method flow for displaying color images using a field-sequence-based liquid crystal display device, which mainly includes the following steps:

[0132] S601: Divide the image to be displayed into a first subframe, a second subframe, and a third subframe, where the first subframe corresponds to the first color field, the second subframe corresponds to the second color field, and the third subframe corresponds to the third color field.

[0133] Among them, the first color field, the second color field, and the third color field are either mixed color fields or monochromatic fields.

[0134] For example, taking the RGB algorithm, the first color field corresponding to the first subframe is the red color field, the second color field corresponding to the second subframe is the green color field, and the third color field corresponding to the third subframe is the blue color field.

[0135] For example, taking the Stencil algorithm, the first color field corresponding to the first subframe is an RGB mixed color field, where green is the primary color and red and blue are secondary colors. The second color field corresponding to the second subframe is a red color field, and the color field corresponding to the third subframe is a blue color field.

[0136] For example, taking the LPD algorithm as an example, the first color field corresponding to the first subframe is an RGB mixed color field, the second color field corresponding to the second subframe is an RGB mixed color field, and the third color field corresponding to the third subframe is an RGB mixed color field.

[0137] For a monochrome field, the dominant color of the field is the color of the field itself. For example, the dominant color of a red field is red, the dominant color of a green field is green, and the dominant color of a blue field is blue.

[0138] For mixed color fields, the primary color of the color field is a fixed color set according to the physical hardware, such as green, or it can be any one of the three primary colors R, G, and B, which can be flexibly determined according to the image content.

[0139] S602: Drive the liquid crystal panel according to the grayscale value of the primary color of the first color field corresponding to the first subframe, drive at least one backlight corresponding to the first color field to emit a first backlight for a first duration during the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, do not drive the white backlight during the first duration, and drive the white backlight to emit white light for a second duration after the first duration.

[0140] For the first color field corresponding to the first subframe, the first backlight brightness of the first color field can be determined based on the maximum and average grayscale values ​​of the primary color of the first color field among the three primary colors of the pixel. A backlight driving signal is then generated based on the first backlight brightness. Simultaneously, the first transmittance of the first color field is determined based on the grayscale value of the primary color of the first color field among the three primary colors of the pixel and the backlight brightness of the first color field. A liquid crystal driving signal for the liquid crystal panel is then generated based on the first transmittance. The liquid crystal panel drives the liquid crystal molecules to rotate according to the liquid crystal driving signal. When the liquid crystal molecules in the liquid crystal panel reach a steady state, the backlight module drives at least one backlight source corresponding to the first color field to emit first backlight for a first duration according to the backlight driving signal, without driving the white backlight source. After the first duration, the white backlight source is driven to emit white light for a second duration.

[0141] During the period when the liquid crystal molecules corresponding to the first subframe reach a steady state, the first transmittance of the liquid crystal panel remains unchanged.

[0142] Taking the RGB algorithm as an example, such as Figure 7A As shown, assuming the first color field is red, the backlight module drives the red backlight to emit red light for a first duration, and then drives the white backlight to emit white light for a second duration.

[0143] Taking the Stencil algorithm as an example, such as Figure 7B As shown, assuming the first color field is an RGB mixed color field, where green is the main color, the backlight module drives the red backlight, green backlight and blue backlight to emit mixed color light for a first duration, and then drives the white backlight to emit white light for a second duration.

[0144] S603: Drive the liquid crystal panel according to the grayscale value of the primary color of the second color field corresponding to the second subframe, drive at least one backlight corresponding to the first color field to emit second backlight for a first duration during the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, and do not drive the white backlight during the first duration; and after the first duration, drive the white backlight to emit white light for a second duration.

[0145] For the second color field corresponding to the second subframe, the second backlight brightness of the second color field can be determined based on the maximum and average grayscale values ​​of the primary color of the second color field among the three primary colors of the pixel. A backlight driving signal is then generated based on the second backlight brightness. Simultaneously, the second transmittance of the second color field is determined based on the grayscale values ​​of the primary color of the second color field among the three primary colors of the pixel and the backlight brightness of the second color field. A liquid crystal driving signal for the liquid crystal panel is then generated based on the second transmittance. The liquid crystal panel drives the liquid crystal molecules to rotate according to the liquid crystal driving signal. When the liquid crystal molecules in the liquid crystal panel reach a steady state, the backlight module drives at least one backlight source corresponding to the second color field to emit second backlight for a first duration according to the backlight driving signal, without driving the white backlight source. After the first duration, the white backlight source is driven to emit white light for a second duration.

[0146] During the period when the liquid crystal molecules corresponding to the second subframe reach a steady state, the second transmittance of the liquid crystal panel remains unchanged.

[0147] like Figure 7A As shown, assuming the second color field is a green color field, after the backlight module drives the green backlight to emit green light for a first duration, it then drives the white backlight to emit white light for a second duration.

[0148] like Figure 7B As shown, assuming the second color field is red, the backlight module drives the red backlight to emit red light for a first duration, and then drives the white backlight to emit white light for a second duration.

[0149] S604: Drive the liquid crystal panel according to the grayscale value of the main color of the third color field corresponding to the third subframe, drive at least one backlight corresponding to the third color field to emit third backlight for a first duration during the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, and do not drive the white backlight during the first duration; and after the first duration, drive the white backlight to emit white light for a second duration.

[0150] For the third color field corresponding to the third subframe, the third backlight brightness of the third color field can be determined based on the maximum and average grayscale values ​​of the primary color of the third color field among the three primary colors of the pixel. A backlight driving signal is then generated based on the third backlight brightness. Simultaneously, the third transmittance of the third color field is determined based on the grayscale value of the primary color of the third color field among the three primary colors of the pixel and the backlight brightness of the third color field. A liquid crystal driving signal for the liquid crystal panel is then generated based on the third transmittance. The liquid crystal panel drives the liquid crystal molecules to rotate according to the liquid crystal driving signal. When the liquid crystal molecules in the liquid crystal panel reach a steady state, the backlight module drives at least one backlight source corresponding to the third color field to emit third backlight for a first duration according to the backlight driving signal, without driving the white backlight source. After the first duration, the white backlight source is driven to emit white light for a second duration.

[0151] During the period when the liquid crystal molecules corresponding to the third subframe reach a steady state, the third transmittance of the liquid crystal panel remains unchanged.

[0152] like Figure 7A As shown, assuming the third color field is the blue color field, the backlight module drives the blue backlight to emit blue light for a first duration, and then drives the white backlight to emit white light for a second duration.

[0153] like Figure 7B As shown, assuming the third color field is the blue color field, the backlight module drives the blue backlight to emit blue light for a first duration, and then drives the white backlight to emit white light for a second duration.

[0154] It should be noted that the period during which the liquid crystal molecules reach stability is the backlight illumination stage, and the sum of the first and second durations is less than or equal to the backlight illumination stage time. Optionally, to improve the utilization rate of white light, Figure 7A and Figure 7B The sum of the first and second durations equals the backlight illumination phase time.

[0155] In field-sequence based liquid crystal display technology, the image to be displayed can be decomposed into three sub-frames, each corresponding to a color field. The color field can be a monochromatic field or a mixed color field, thus being suitable for improving color separation phenomena in various algorithms. A monochromatic field corresponds to a backlight of one color, while a mixed color field corresponds to a backlight of at least two colors. Thus, when driving the liquid crystal panel according to the primary color grayscale value of the color field corresponding to each sub-frame, during the period when the liquid crystal molecules reach a steady state, at least one backlight corresponding to the color field is first driven to emit backlight for a first duration. Then, after the first duration, a white backlight is driven to emit white light for a second duration. By adding white light during the steady-state time of the liquid crystal molecules, the color gamut range of the color field corresponding to each sub-frame is reduced, thereby mitigating color separation phenomena.

[0156] In some embodiments, when the white backlight is fully illuminated, the backlight module does not need to perform dimming processing when driving the white backlight, that is, the backlight value of the white backlight is fixed. At this time, after the first duration corresponding to each color field, the backlight module can be driven to drive the white backlight to emit white light for the same second duration with the set backlight value, thereby ensuring that an equal amount of white light is added without difference during the backlight illumination stage corresponding to each color field, realizing the proportional compression of the color gamut range of the three primary colors R, G, and B, thereby reducing color separation phenomenon and color shift problem.

[0157] In some embodiments, the backlight module can be divided into multiple backlight zones, each corresponding to an image block of the image to be displayed. Based on the content of the image block corresponding to each backlight zone, the white backlight source can be locally dimmed. In this case, the backlight value of the white backlight source is not fixed.

[0158] In practice, the local dimming process for the white backlight in each backlight zone includes:

[0159] First, based on the primary color grayscale value of the color field corresponding to each subframe of the image block corresponding to the backlight partition, calculate the first backlight value of at least one backlight source corresponding to each color field.

[0160] Similarly, each image patch can be divided into three subframes, each corresponding to a color field, which can be a monochromatic field or a mixed color field. The calculation process for the backlight value of the color field corresponding to the subframe of the image patch is similar to the calculation process for the backlight value of the subframe of the complete image, and will not be repeated here.

[0161] Then, based on the first backlight value of at least one backlight source corresponding to each color field and the preset addition ratio, the second backlight value of the white backlight source corresponding to each color field is determined.

[0162] The second backlight value of the white backlight is the product of the first backlight value and a preset addition ratio. The second backlight value is less than the first backlight value of at least one backlight for each color field, thereby avoiding the sacrifice of a large color gamut and ensuring image display quality.

[0163] Furthermore, after the first duration of each color field, at least one of the following is determined based on the second backlight value of the white backlight: the second duration of driving the white backlight within the backlight zone, the duration percentage, and the driving voltage.

[0164] The white light added to the color field corresponding to the three subframes of each image block can be controlled from multiple levels, including time, time duty cycle, and driving voltage.

[0165] When adding white light in a local dimming scene, the amount of white light added can be controlled by the first backlight value of the color field corresponding to the three sub-frames contained in each backlight partition and the preset addition ratio. This ensures that the color field corresponding to the three sub-frames contained in each image block is added with an equal amount of white light, thereby achieving dynamic compression of the color gamut range with the content of the image block, reducing color separation phenomenon while improving image display quality.

[0166] In one embodiment, the backlight module 502 includes a red backlight source, a green backlight source, and a blue backlight source. The backlight module emits white light through these three backlight sources, thereby effectively saving the hardware cost of the backlight module.

[0167] like Figure 8 The diagram shows a method flow for displaying color images using a field-sequence-based liquid crystal display device, which mainly includes the following steps:

[0168] S801: Divide the image to be displayed into a first subframe, a second subframe, and a third subframe, where the first subframe corresponds to the first color field, the second subframe corresponds to the second color field, and the third subframe corresponds to the third color field.

[0169] Among them, the first color field, the second color field, and the third color field are either mixed color fields or monochromatic fields.

[0170] For example, taking the RGB algorithm, the first color field corresponding to the first subframe is the red color field, the second color field corresponding to the second subframe is the green color field, and the third color field corresponding to the third subframe is the blue color field.

[0171] For example, taking the Stencil algorithm, the first color field corresponding to the first subframe is an RGB mixed color field, where green is the primary color and red and blue are secondary colors. The second color field corresponding to the second subframe is a red color field, and the color field corresponding to the third subframe is a blue color field.

[0172] For example, taking the LPD algorithm as an example, the first color field corresponding to the first subframe is an RGB mixed color field, the second color field corresponding to the second subframe is an RGB mixed color field, and the third color field corresponding to the third subframe is an RGB mixed color field.

[0173] For a monochrome field, the dominant color of the field is the color of the field itself. For example, the dominant color of a red field is red, the dominant color of a green field is green, and the dominant color of a blue field is blue.

[0174] For mixed color fields, the primary color of the color field is a fixed color set according to the physical hardware, such as green, or it can be any one of the three primary colors R, G, and B, which can be flexibly determined according to the image content.

[0175] S802: Drive the liquid crystal panel according to the grayscale value of the primary color of the first color field corresponding to the first subframe, drive at least one backlight corresponding to the first color field to emit a first backlight for a first duration during the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, and simultaneously light up the red backlight, green backlight and blue backlight so that the three backlights emit white light for a second duration.

[0176] For the first color field corresponding to the first subframe, the first backlight brightness of the first color field can be determined based on the maximum and average grayscale values ​​of the primary color of the first color field among the three primary colors of the pixel. A backlight driving signal is then generated based on the first backlight brightness. Simultaneously, the first transmittance of the first color field is determined based on the grayscale values ​​of the primary color of the first color field among the three primary colors of the pixel and the backlight brightness of the first color field. A liquid crystal driving signal for the liquid crystal panel is then generated based on the first transmittance. The liquid crystal panel drives the liquid crystal molecules to rotate according to the liquid crystal driving signal. When the liquid crystal molecules in the liquid crystal panel reach a steady state, the backlight module drives at least one backlight source corresponding to the first color field to emit first backlight for a first duration according to the backlight driving signal. After the first duration, the red backlight source, green backlight source, and blue backlight source are simultaneously driven to emit white light for a second duration.

[0177] During the period when the liquid crystal molecules corresponding to the first subframe reach a steady state, the first transmittance of the liquid crystal panel remains unchanged.

[0178] Taking the RGB algorithm as an example, such as Figure 9A As shown, assuming the first color field is red, the backlight module drives the red backlight to emit red light for a first duration, and then drives the red backlight, green backlight and blue backlight to emit white light for a second duration.

[0179] Taking the Stencil algorithm as an example, such as Figure 9B As shown, assuming the first color field is an RGB mixed color field, where green is the main color, the backlight module drives the red backlight, green backlight and blue backlight to emit mixed color light for a first duration, and then drives the red backlight, green backlight and blue backlight to emit white light for a second duration.

[0180] S803: Drive the liquid crystal panel according to the grayscale value of the primary color of the second color field corresponding to the second subframe, drive at least one backlight corresponding to the first color field to emit a second backlight for a first duration during the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, and after the first duration, simultaneously light up the red backlight, the green backlight and the blue backlight so that the three backlights emit white light for a second duration.

[0181] For the second color field corresponding to the second subframe, the second backlight brightness of the second color field can be determined based on the maximum and average grayscale values ​​of the primary color of the second color field among the three primary colors of the pixel. A backlight driving signal is then generated based on the second backlight brightness. Simultaneously, the second transmittance of the second color field is determined based on the grayscale values ​​of the primary color of the second color field among the three primary colors of the pixel and the backlight brightness of the second color field. A liquid crystal driving signal for the liquid crystal panel is then generated based on the second transmittance. The liquid crystal panel drives the liquid crystal molecules to rotate according to the liquid crystal driving signal. When the liquid crystal molecules in the liquid crystal panel reach a steady state, the backlight module drives at least one backlight source corresponding to the second color field to emit second backlight for a first duration according to the backlight driving signal. After the first duration, the red backlight source, green backlight source, and blue backlight source are simultaneously driven to emit white light for a second duration.

[0182] During the period when the liquid crystal molecules corresponding to the second subframe reach a steady state, the second transmittance of the liquid crystal panel remains unchanged.

[0183] like Figure 9A As shown, assuming the second color field is a green color field, the backlight module drives the green backlight to emit green light for a first duration, and then drives the red backlight, green backlight and blue backlight to emit white light for a second duration.

[0184] like Figure 9B As shown, assuming the second color field is red, the backlight module drives the red backlight to emit red light for a first duration, and then drives the red backlight, green backlight and blue backlight to emit white light for a second duration.

[0185] S804: Drive the liquid crystal panel according to the grayscale value of the main color of the third color field corresponding to the third subframe, drive at least one backlight corresponding to the third color field to emit third backlight for a first duration during the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, and after the first duration, simultaneously light up the red backlight, green backlight and blue backlight so that the three backlights emit white light for a second duration.

[0186] For the third color field corresponding to the third subframe, the third backlight brightness of the third color field can be determined based on the maximum and average grayscale values ​​of the primary color of the third color field among the three primary colors of the pixel. A backlight driving signal is then generated based on the third backlight brightness. Simultaneously, the third transmittance of the third color field is determined based on the grayscale values ​​of the primary color of the third color field among the three primary colors of the pixel and the backlight brightness of the third color field. A liquid crystal driving signal for the liquid crystal panel is then generated based on the third transmittance. The liquid crystal panel drives the liquid crystal molecules to rotate according to the liquid crystal driving signal. When the liquid crystal molecules in the liquid crystal panel reach a steady state, the backlight module drives at least one backlight source corresponding to the third color field to emit third backlight for a first duration according to the backlight driving signal. After the first duration, the red backlight source, green backlight source, and blue backlight source are simultaneously driven to emit white light for a second duration.

[0187] During the period when the liquid crystal molecules corresponding to the third subframe reach a steady state, the third transmittance of the liquid crystal panel remains unchanged.

[0188] like Figure 9A As shown, assuming the third color field is the blue color field, the backlight module drives the blue backlight to emit blue light for a first duration, and then drives the red backlight, green backlight and blue backlight to emit white light for a second duration.

[0189] like Figure 9B As shown, assuming the third color field is the blue color field, the backlight module drives the blue backlight to emit blue light for a first duration, and then drives the red backlight, green backlight and blue backlight to emit white light for a second duration.

[0190] It should be noted that the period during which the liquid crystal molecules reach stability is the backlight illumination stage, and the sum of the first and second durations is less than or equal to the backlight illumination stage time. Optionally, to improve the utilization rate of white light, Figure 7A and Figure 7B The sum of the first and second durations equals the backlight illumination phase time.

[0191] In field-sequence based liquid crystal display technology, the image to be displayed can be decomposed into three sub-frames, each corresponding to a color field. The color field can be a monochromatic field or a mixed-color field, thus being suitable for improving color separation phenomena in various algorithms. A monochromatic field corresponds to a backlight of one color, while a mixed-color field corresponds to a backlight of at least two colors. Thus, when driving the liquid crystal panel according to the primary color grayscale value of the color field corresponding to each sub-frame, during the period when the liquid crystal molecules reach a steady state, at least one backlight corresponding to the color field is first driven to emit backlight for a first duration. Then, after the first duration, all three backlights are driven to emit white light for a second duration. By adding white light during the steady-state time of the liquid crystal molecules, the color gamut range of the color field corresponding to each sub-frame is reduced, thereby mitigating color separation phenomena.

[0192] In some embodiments, when all three backlight sources are fully illuminated to form white light, the backlight module does not need to perform dimming processing when driving the three backlight sources, that is, the backlight values ​​of the three backlight sources are fixed. At this time, after the first duration corresponding to each color field, the backlight module can be driven to simultaneously illuminate the red backlight source, green backlight source, and blue backlight source with the set backlight value to emit white light for the same second duration. This ensures that an equal amount of white light is added without difference during the backlight illumination stage corresponding to each color field, and achieves proportional compression of the color gamut range of the three primary colors R, G, and B. This reduces color separation phenomenon and color shift problem.

[0193] In some embodiments, the backlight module can be divided into multiple backlight zones, each corresponding to an image block of the image to be displayed. Based on the content of the image block corresponding to each backlight zone, the white backlight source can be locally dimmed. In this case, the backlight value of the white backlight source is not fixed.

[0194] In practice, the local dimming process for white light in each backlight zone includes:

[0195] First, based on the primary color grayscale value of the color field corresponding to each subframe of the image block corresponding to the backlight partition, calculate the first backlight value of at least one backlight source corresponding to each color field.

[0196] Similarly, each image patch can be divided into three subframes, each corresponding to a color field, which can be a monochromatic field or a mixed color field. The calculation process for the backlight value of the color field corresponding to the subframe of the image patch is similar to the calculation process for the backlight value of the subframe of the complete image, and will not be repeated here.

[0197] Then, based on the first backlight value of at least one backlight source corresponding to each color field and the preset addition ratio, the second backlight values ​​of the red backlight source, green backlight source, and blue backlight source corresponding to each color field are determined.

[0198] The second backlight value is the product of the first backlight value and a preset addition ratio. The second backlight value of the red, green, or blue backlight is less than the first backlight value of the corresponding color of the backlight in at least one backlight for each color field within the first time period, thereby avoiding the sacrifice of a large color gamut and ensuring image display quality.

[0199] Furthermore, after the first duration of each color field, at least one of the following is determined based on the second backlight value: the second duration, duration ratio, and driving voltage of the red backlight, green backlight, and blue backlight within the backlight zone.

[0200] The white light added to the color field corresponding to the three subframes of each image block can be controlled from multiple levels, including time, time duty cycle, and driving voltage.

[0201] When adding white light in a local dimming scene, the amount of white light added can be controlled by the first backlight value of the color field corresponding to the three sub-frames contained in each backlight partition and the preset addition ratio. This ensures that the color field corresponding to the three sub-frames contained in each image block is added with an equal amount of white light, thereby achieving dynamic compression of the color gamut range with the content of the image block, reducing color separation phenomenon while improving image display quality.

[0202] like Figure 10The diagram shows the system architecture of a liquid crystal display device for displaying color images. It comprises five modules: image signal input, image signal splitting, backlight drivers for the three color fields, backlight driver for the white color field, and LCD panel driver. The image input module receives the image to be displayed via an interface such as HDMI or USB. The image signal splitting module divides the image into three sub-frames, each corresponding to a monochrome or mixed color field. The three color field backlight driver modules calculate the backlight brightness value for each color field and generate backlight drive signals to illuminate the red, green, and blue backlights. For each color field, the white color field backlight driver module calculates the added white light brightness value and generates a backlight drive signal for the white light emitted by the backlight module. The LCD panel driver module drives the liquid crystal molecules to a steady state based on the transmittance of the corresponding color field, thereby controlling the screen brightness when the backlight module emits light according to the backlight drive signals for each color field and the corresponding white color field.

[0203] Those skilled in the art will understand that various aspects of this application can be implemented as a system, method, or program product. Therefore, various aspects of this application can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, collectively referred to herein as a "circuit," "module," or "system."

[0204] This application also provides a computer-readable storage medium for storing instructions that, when executed, can perform the steps of any of the color image display methods described in the foregoing embodiments.

[0205] This application also provides a computer program product for storing a computer program that performs the steps of any of the color image display methods described in the foregoing embodiments.

[0206] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0207] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0208] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0209] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0210] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A field-sequence based liquid crystal display device, characterized in that, include: LCD panel; A backlight module, comprising a red backlight source, a green backlight source, a blue backlight source, and a white backlight source; The processor is configured as follows: The image to be displayed is divided into a first subframe, a second subframe, and a third subframe, wherein the first subframe corresponds to a first color field, the second subframe corresponds to a second color field, and the third subframe corresponds to a third color field, and the first color field, the second color field, and the third color field are mixed color fields or monochrome fields; The liquid crystal panel is driven according to the primary color grayscale value of the first color field corresponding to the first subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a first backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration. The liquid crystal panel is driven according to the primary color grayscale value of the second color field corresponding to the second subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a second backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration. The liquid crystal panel is driven according to the primary color grayscale value of the third color field corresponding to the third subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the third color field is driven to emit a third backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration.

2. The liquid crystal display device as described in claim 1, characterized in that, The processor is configured to drive the white backlight to emit white light for a second duration after the first duration, including: After a first duration corresponding to each color field, the backlight module is driven to emit white light for the same second duration at a set backlight value.

3. The liquid crystal display device as described in claim 1, characterized in that, The backlight module is divided into multiple backlight zones, and each backlight zone corresponds to an image block in the image to be displayed; The processor is configured to drive the white backlight to emit white light for a second duration after the first duration, including: Based on the primary color grayscale value of the color field corresponding to each subframe of the image block corresponding to the backlight partition, calculate the first backlight value of at least one backlight source corresponding to each color field. The second backlight value of the white backlight corresponding to each color field is determined based on the first backlight value of at least one backlight corresponding to each color field and the preset addition ratio. After the first duration of each color field, at least one of the following is determined based on the second backlight value of the white backlight: the second duration of driving the white backlight within the backlight zone, the duration percentage, and the driving voltage.

4. The liquid crystal display device as described in claim 3, characterized in that, The second backlight value of the white backlight is less than the first backlight value of at least one backlight corresponding to each color field.

5. A field-sequence based liquid crystal display device, characterized in that, include: LCD panel; A backlight module, comprising a red backlight source, a green backlight source, a blue backlight source, and a white backlight source; The processor is configured as follows: The image to be displayed is divided into a first subframe, a second subframe, and a third subframe, wherein the first subframe corresponds to a first color field, the second subframe corresponds to a second color field, and the third subframe corresponds to a third color field, and the first color field, the second color field, and the third color field are mixed color fields or monochrome fields; The liquid crystal panel is driven according to the primary color grayscale value of the first color field corresponding to the first subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a first backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up at the same time so that the three backlights emit white light for a second duration. The liquid crystal panel is driven according to the primary color grayscale value of the second color field corresponding to the second subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the second color field is driven to emit a second backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up at the same time so that the three backlights emit white light for a second duration. The liquid crystal panel is driven according to the primary color grayscale value of the third color field corresponding to the third subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the third color field is driven to emit a third backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up simultaneously so that the three backlights emit white light for a second duration.

6. The liquid crystal display device as described in claim 5, characterized in that, The processor is configured to simultaneously illuminate the red backlight, the green backlight, and the blue backlight after the first duration, so that the three backlights emit white light for a second duration, including: After a first duration corresponding to each color field, the red backlight, the green backlight, and the blue backlight are simultaneously illuminated with a set backlight brightness value to emit white light for the same second duration.

7. The liquid crystal display device as described in claim 5, characterized in that, The backlight module is divided into multiple backlight zones, and each backlight zone corresponds to an image block in the image to be displayed; The processor is configured to simultaneously illuminate the red backlight, the green backlight, and the blue backlight after the first duration, so that the three backlights emit white light for a second duration, including: Based on the primary color grayscale value of the color field corresponding to each subframe of the image block corresponding to the backlight partition, calculate the first backlight value of at least one backlight source corresponding to each color field. Based on the first backlight value of at least one backlight source corresponding to each color field and a preset addition ratio, determine the second backlight value of the red backlight source, the green backlight source and the blue backlight source corresponding to each color field; After the first duration of each color field, at least one of the following is determined based on the second backlight value: the second duration, duration ratio, and driving voltage of the red backlight, green backlight, and blue backlight within the backlight zone.

8. The liquid crystal display device as described in claim 7, characterized in that, The second backlight value of the red backlight, the green backlight, or the blue backlight is less than the first backlight value of the corresponding color of the backlight in at least one backlight corresponding to each color field within the first time period.

9. A method for displaying a color image, characterized in that, include: The image to be displayed is divided into a first subframe, a second subframe, and a third subframe, wherein the first subframe corresponds to a first color field, the second subframe corresponds to a second color field, and the third subframe corresponds to a third color field, and the first color field, the second color field, and the third color field are mixed color fields or monochrome fields; The liquid crystal panel is driven according to the primary color grayscale value of the first color field corresponding to the first subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a first backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration. The liquid crystal panel is driven according to the primary color grayscale value of the second color field corresponding to the second subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a second backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration. The liquid crystal panel is driven according to the primary color grayscale value of the third color field corresponding to the third subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the third color field is driven to emit a third backlight for a first duration. During the first duration, the white backlight is not driven. After the first duration, the white backlight is driven to emit white light for a second duration.

10. A method for displaying a color image, characterized in that, include: The image to be displayed is divided into a first subframe, a second subframe, and a third subframe, wherein the first subframe corresponds to a first color field, the second subframe corresponds to a second color field, and the third subframe corresponds to a third color field, and the first color field, the second color field, and the third color field are mixed color fields or monochrome fields; The liquid crystal panel is driven according to the primary color grayscale value of the first color field corresponding to the first subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the first color field is driven to emit a first backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up at the same time so that the three backlights emit white light for a second duration. The liquid crystal panel is driven according to the primary color grayscale value of the second color field corresponding to the second subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the second color field is driven to emit a second backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up at the same time so that the three backlights emit white light for a second duration. The liquid crystal panel is driven according to the primary color grayscale value of the third color field corresponding to the third subframe. During the period when the liquid crystal molecules in the liquid crystal panel reach a steady state, at least one backlight corresponding to the third color field is driven to emit a third backlight for a first duration. After the first duration, the red backlight, the green backlight and the blue backlight are lit up simultaneously so that the three backlights emit white light for a second duration.

Images