Display device and driving method thereof

Abstract

The invention relates to a display device and a driving method thereof.The display device comprises a liquid crystal display panel, a backlight module and a control circuit, a backlight partition of the backlight module comprises at least one light-emitting unit, and the light-emitting unit comprises a red light-emitting chip, a green light-emitting chip, a first blue light-emitting chip and a second blue light-emitting chip; the wavelength of blue light output by the first blue light-emitting chip is smaller than that of blue light output by the second blue light-emitting chip. In the control process, the control circuit determines the backlight value of each color of each backlight subarea according to the image data, and drives the first blue light-emitting chip and the second blue light-emitting chip in the backlight subarea according to the blue backlight value of the backlight subarea. The display device can simultaneously reproduce wide color gamut colors of magenta and cyan, and the color gamut performance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display devices, and in particular to a display device and a driving method of the display device. BACKGROUND

[0002] With the development of electronic technology, various display devices have emerged. The display device refers to a device with image output function, including televisions, tablets, etc., and is widely used in various scenes such as homes, schools, and businesses.

[0003] In the related art, a local dimming technology is proposed, which separately controls LEDs (Light Emitting Diode) for emitting red light, green light, and blue light in different areas of the screen to enhance the visual effect. However, the traditional display device has the problem of being difficult to simultaneously realize deep blue and cyan color reproduction, affecting the color gamut performance. SUMMARY

[0004] The present application provides a display device and a driving method of the display device to improve the color gamut performance of the display device and improve the display effect.

[0005] In a first aspect, a display device is provided, which includes:

[0006] a liquid crystal display panel configured to display an image;

[0007] a backlight module configured to provide a light source for the liquid crystal display panel; the backlight module includes a plurality of backlight partitions, each of the backlight partitions includes at least one light emitting unit, and each of the light emitting units includes a red light emitting chip, a green light emitting chip, a first blue light emitting chip, and a second blue light emitting chip; the first blue light emitting chip outputs blue light with a wavelength smaller than that of the second blue light emitting chip;

[0008] a control circuit connected to the liquid crystal display panel and the backlight module, and configured to:

[0009] obtain image data, and determine color backlight values of the backlight partitions based on the image data;

[0010] drive the first blue light emitting chip and the second blue light emitting chip in the backlight partitions based on the blue backlight values of the backlight partitions, and drive the red light emitting chip and the green light emitting chip in the backlight partitions based on the red backlight values and the green backlight values of the backlight partitions, respectively.

[0011] In some embodiments, the control circuit is further configured to:

[0012] calculate the backlight values of each color of the backlight partition to obtain color data corresponding to the backlight partition, the color data comprising saturation;

[0013] in a case where the saturation corresponding to the backlight partition is less than a first preset value, according to the blue backlight value of the backlight partition, the first blue light emitting chip and the second blue light emitting chip in the backlight partition are mixedly driven;

[0014] in a case where the saturation corresponding to the backlight partition is greater than or equal to the first preset value, according to the blue backlight value of the backlight partition, the first blue light emitting chip and / or the second blue light emitting chip in the backlight partition are driven.

[0015] In some embodiments, the color data further comprises hue; the control circuit is further configured to:

[0016] in a case where the saturation corresponding to the backlight partition is greater than or equal to the first preset value, and the hue corresponding to the backlight partition is located in a first hue interval, according to the blue backlight value of the backlight partition, the first blue light emitting chip and the second blue light emitting chip in the backlight partition are mixedly driven; the first hue interval is a hue range from the blue light hue of the second blue light emitting chip to the blue light hue of the first blue light emitting chip;

[0017] in a case where the saturation corresponding to the backlight partition is greater than or equal to the first preset value, and the hue corresponding to the backlight partition is located in a second hue interval, according to the blue backlight value of the backlight partition, the second blue light emitting chip is driven, and the first blue light emitting chip is not driven; the second hue interval is a hue range from the green light hue of the green light emitting chip to the blue light hue of the second blue light emitting chip;

[0018] in a case where the saturation corresponding to the backlight partition is greater than or equal to the first preset value, and the hue corresponding to the backlight partition is located in a third hue interval, according to the blue backlight value of the backlight partition, the first blue light emitting chip is driven, and the second blue light emitting chip is not driven; the third hue interval is a hue range from the blue light hue of the first blue light emitting chip to the red light hue of the red light emitting chip to the green light hue.

[0019] In some embodiments, the control circuit is further configured to:

[0020] In a case where the saturation corresponding to the backlight partition is greater than or equal to the first preset value and the hue corresponding to the backlight partition is located in the first hue interval, a first blue backlight value is generated according to the blue backlight value of the backlight partition to drive the first blue light emitting chip, and a second blue backlight value is generated to drive the second blue light emitting chip, where a difference in luminance of blue light output by the first blue light emitting chip and the second blue light emitting chip is less than a preset threshold.

[0021] In some embodiments, the control circuit is further configured to:

[0022] In a case where the saturation is less than the first preset value, a mixing ratio corresponding to the saturation of the backlight partition is determined according to a preset correspondence relationship between the hue interval in which the hue corresponding to the backlight partition is located and the saturation of the backlight partition.

[0023] The first blue light emitting chip and the second blue light emitting chip in the backlight partition are mixedly driven according to the blue backlight value of the backlight partition and the corresponding mixing ratio.

[0024] In some embodiments, the preset correspondence relationship includes a first correspondence relationship corresponding to the first hue interval, a second correspondence relationship corresponding to the second hue interval, and a third correspondence relationship corresponding to the third hue interval.

[0025] In the first correspondence relationship, the proportion of blue light output by the first blue light emitting chip decreases as the saturation increases, and the proportion of blue light output by the second blue light emitting chip increases as the saturation increases.

[0026] In the second correspondence relationship, the proportion of blue light output by the first blue light emitting chip decreases as the saturation increases, and the proportion of blue light output by the second blue light emitting chip increases as the saturation of the backlight partition increases.

[0027] In the third correspondence relationship, the proportion of blue light output by the first blue light emitting chip increases as the saturation increases, and the proportion of blue light output by the second blue light emitting chip decreases as the saturation of the backlight partition increases.

[0028] In some embodiments, in the first correspondence relationship, the second correspondence relationship, and the third correspondence relationship, in a case where the saturation of the backlight partition is 0, the proportion of blue light output by the first blue light emitting chip is greater than the proportion of blue light output by the second blue light emitting chip.

[0029] In some embodiments, the control circuit is further configured to:

[0030] The driving data of each color pixel is generated according to the input gray scale value of each color pixel and the correction coefficient corresponding to each color pixel, so as to drive the liquid crystal display panel; wherein the correction coefficient corresponding to each color pixel is generated according to the color backlight value of each backlight partition corresponding to each color pixel.

[0031] In a second aspect, a driving method of a display device is provided, which is used in the display device as described above, and the driving method comprises:

[0032] Obtaining image data, and determining the color backlight value of each backlight partition according to the image data;

[0033] Driving the first blue light emitting chip and the second blue light emitting chip in the backlight partition according to the blue backlight value of the backlight partition; and driving the red light emitting chip and the green light emitting chip in the backlight partition according to the red backlight value and the green backlight value of the backlight partition, respectively.

[0034] In some embodiments, the driving the first blue light emitting chip and the second blue light emitting chip in the backlight partition according to the blue backlight value of the backlight partition comprises:

[0035] Calculating the color data corresponding to the backlight partition according to the color backlight value of the backlight partition, wherein the color data comprises saturation.

[0036] In the case that the saturation corresponding to the backlight partition is less than a first preset value, the first blue light emitting chip and the second blue light emitting chip in the backlight partition are driven according to the blue backlight value of the backlight partition.

[0037] In the case that the saturation corresponding to the backlight partition is greater than or equal to the first preset value, the first blue light emitting chip and / or the second blue light emitting chip in the backlight partition are driven according to the blue backlight value of the backlight partition.

[0038] The display device and the driving method of the display device include a liquid crystal display panel, a backlight module and a control circuit. The backlight sub-area of the backlight module includes at least one light emitting unit. The light emitting unit includes a red light emitting chip, a green light emitting chip, a first blue light emitting chip and a second blue light emitting chip. The wavelength of the blue light output by the first blue light emitting chip is shorter than the wavelength of the blue light output by the second blue light emitting chip. The first blue light emitting chip with a short wavelength is beneficial to improve the color reproduction capability of magenta, and the second blue light emitting chip with a long wavelength is beneficial to improve the color reproduction capability of cyan. In the control process, the control circuit determines the color backlight values of each backlight sub-area according to image data, and drives the first blue light emitting chip and the second blue light emitting chip in the backlight sub-area according to the blue backlight value of the backlight sub-area. Therefore, the display device can realize wide color gamut color reproduction of magenta and cyan at the same time, and greatly improve the color gamut performance. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the description of the embodiments of the present application or the related art will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other related drawings can also be obtained without creative labor.

[0040] Figure 1 The structural diagram of the display device provided by some embodiments of the present application is shown.

[0041] Figure 2 The structural diagram of the display device provided by some embodiments of the present application is shown.

[0042] Figure 3 The partition schematic diagram of the backlight module provided by some embodiments of the present application is shown.

[0043] Figure 4 The structural schematic diagram of the backlight module provided by some embodiments of the present application is shown.

[0044] Figure 5 The structural schematic diagram of the backlight module provided by some embodiments of the present application is shown.

[0045] Figure 6 The chromaticity diagram of the display device provided by some embodiments of the present application is shown.

[0046] Figure 7 The structural schematic diagram of the driving architecture of the display device provided by some embodiments of the present application is shown.

[0047] Figure 8 The structural schematic diagram of the driving architecture of the display device provided by some embodiments of the present application is shown.

[0048] Figure 9 A flow chart of a process of a control circuit of a display device provided for some embodiments of the present application;

[0049] Figure 10 A chromaticity diagram of a display device provided for some embodiments of the present application;

[0050] Figure 11 A chromaticity diagram of a display device provided for some embodiments of the present application; Figure 10 A coordinate diagram of a chromaticity diagram of a display device provided for some embodiments of the present application;

[0051] Figure 12 A polar coordinate representation of chromaticity information of a display device provided for some embodiments of the present application in HSV color space;

[0052] Figure 13 A curve diagram of a first correspondence provided for some embodiments of the present application;

[0053] Figure 14 A curve diagram of a second correspondence provided for some embodiments of the present application;

[0054] Figure 15 A curve diagram of a third correspondence provided for some embodiments of the present application;

[0055] Figure 16 A diagram of a mixing ratio of blue light output by two blue light emitting chips in a light emitting unit of a display device provided for some embodiments of the present application;

[0056] Figure 17 A diagram of a mixing ratio of light output by each light emitting chip in a light emitting unit of a display device provided for some embodiments of the present application;

[0057] Figure 18 A diagram of a mixing ratio of light output by each light emitting chip in a light emitting unit of a display device provided for some embodiments of the present application. DETAILED DESCRIPTION

[0058] The embodiments will be described in detail with reference to the drawings, wherein like reference numerals refer to like elements throughout. The following detailed description is not intended to restrict the embodiments to any specific embodiments described, but rather, is intended to provide what is considered to be a practical illustrative example of methods and systems consistent with the embodiments. Therefore, it is not intended that the embodiments be limited to the specific embodiments disclosed.

[0059] It should be noted that the brief description of terms in the present application is only for the convenience of understanding the following described embodiments, and is not intended to limit the embodiments of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and common meanings.

[0060] The terms "first," "second," "third," 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 specified. It should be understood that such terms are interchangeable where appropriate.

[0061] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0062] The term "module" refers to any known or subsequently developed hardware, software, firmware, artificial intelligence, fuzzy logic, or combination of hardware and / or software code that is capable of performing the functions associated with that element.

[0063] In some embodiments, a display device is provided, which may be a display product such as a liquid crystal display screen, a liquid crystal monitor, or an instrument panel, or a mobile terminal product such as a monitor, a mobile phone, a tablet computer, or a smart photo album. In one application scenario, the display device may be an LCD TV.

[0064] In some exemplary embodiments, such as Figure 1 As shown, the display device includes a backlight module 100 and a liquid crystal display panel 200. The backlight module 100 provides a light source for the liquid crystal display panel 200, which is located on the light-emitting side of the backlight module 100 and is used to display images. The liquid crystal display panel 200 has multiple pixels arranged in an array, each pixel including at least a red pixel, a green pixel, and a blue pixel. The transmittance and color of the light incident on each color pixel can be independently controlled so that the light transmitted through all pixels constitutes the image to be displayed.

[0065] In some embodiments, the liquid crystal display panel 200 may include a liquid crystal layer and a color resist layer to modulate the transmittance and color of light incident on the liquid crystal display panel 200 from the backlight module 100. Furthermore, the liquid crystal display panel 200 may also integrate functional layers such as touch electrodes, polarizers, and anti-reflective layers; the process parameters can be adjusted according to actual needs. For example… Figure 2 As shown, the display device also includes an optical film 300, which is disposed between the backlight module 100 and the liquid crystal display panel 200 to homogenize the light emitted by the backlight module 100 and reduce problems such as uneven brightness. It can be understood that, in actual implementation, the display device may also include other components besides... Figure 1 , Figure 2 Other conventional constituent elements besides those shown.

[0066] In some embodiments, the backlight module 100 includes a plurality of light-emitting units arranged in an array. In this embodiment, the backlight module 100 is divided into multiple independently controllable backlight zones, each containing at least one light-emitting unit. The number of zones is not limited and can be determined according to actual display requirements. For example… Figure 3 As shown, the backlight module 100 can be divided into multiple rows (e.g., 50 rows) along the row direction and multiple columns (e.g., 20 columns) along the column direction, thereby dividing the backlight module 100 into 1000 backlight zones. This can be understood as... Figure 3 This diagram illustrates a backlight zone consisting of two light-emitting units. In actual implementation, the number of light-emitting units in each backlight zone can be adjusted according to the specific requirements. Each zone can independently adjust its brightness and color, enabling local dimming. This allows for precise control of the light source's brightness and color, achieving high contrast and a wide color gamut.

[0067] Reference Figure 4 In some embodiments, the light-emitting unit 110 includes a red light-emitting chip 111, a green light-emitting chip 112, a first blue light-emitting chip 113, and a second blue light-emitting chip 114. Exemplarily, the light-emitting chips are arranged sequentially in the same direction, with the first blue light-emitting chip 113 and the second blue light-emitting chip 114 arranged adjacent to each other. This arrangement enhances the consistency of light color and diffusion effect when the red light-emitting chip 111, green light-emitting chip 112, and first blue light-emitting chip 113 are lit, or when the red light-emitting chip 111, green light-emitting chip 112, and second blue light-emitting chip 114 are lit, or when the red light-emitting chip 111, green light-emitting chip 112, first blue light-emitting chip 113, and second blue light-emitting chip 114 are lit.

[0068] In some embodiments, each light-emitting chip in the light-emitting unit 110 can be an independent structure, or it can be as follows: Figure 5 As shown, each light-emitting chip is housed in the same package structure.

[0069] In this design, the wavelength of the blue light emitted by the first blue light-emitting chip 113 is shorter than that emitted by the second blue light-emitting chip 114. For example, the first blue light-emitting chip 113 emits blue light in the range of 450nm-460nm, which enhances the color reproduction of deep blue and magenta. The second blue light-emitting chip 114 emits blue light in the range of 460nm-480nm, which enhances the color reproduction of cyan while avoiding a significant increase in power consumption.

[0070] In some embodiments, the chromaticity diagram of the display device is as follows: Figure 6 The example,Figure 6 This is the CIE 1976 u'v' chromaticity diagram. The outer edge is marked with the spectral locus, and the inner triangles represent the RGB color gamut. The points in the diagram are data points from SOCS (ISO TR 16066-2003 "Standard Object Color Spectral Database for Color Reproduction Evaluation"). The SOCS database is a dataset of colors found in nature and is often used as a target reference for color reproduction in displays. When traditional display devices use red, green, and blue LED chips, the primary color point of the blue chip is B0. Based on SOCS, it can be found that the display device's color reproduction capability in the deep blue, magenta, and cyan regions is insufficient. In this embodiment, a first blue light-emitting chip 113 with a wavelength range of 450nm-460nm is used, and its primary color point is point B1. It can be seen that it can significantly improve the color reproduction capability in the deep blue and magenta regions (almost covering the SOCS data). A second blue light-emitting chip 114 with a wavelength range of 460nm-480nm is used, and its primary color point is point B2. It can be seen that it significantly improves the color reproduction capability in cyan. Therefore, the display device in this embodiment can meet the requirements of a wide color gamut.

[0071] In some embodiments, the backlight module 100 further includes a substrate 120, which serves to support and carry the light. The substrate 120 may be a printed circuit board (PCB), and its shape can be designed according to actual conditions. The substrate 120 is also provided with traces to realize the electrical connection between the light-emitting unit 110 and the control circuit.

[0072] In some embodiments, the display device further includes a control circuit, such as Figure 7 As shown, the control circuit 400 is electrically connected to the backlight module 100 and the liquid crystal display panel 200 respectively, and is used to acquire image data from the outside to control the backlight module 100 and the liquid crystal display panel 200.

[0073] The control circuit 400 is configured to acquire image data, determine the backlight values ​​of each color in the backlight zone based on the image data, drive the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone based on the blue backlight value of the backlight zone, and drive the red light-emitting chip and the green light-emitting chip in the backlight zone based on the red backlight value and the green backlight value of the backlight zone, respectively.

[0074] In some embodiments, such as Figure 8 As shown, the control circuit 400 may include an image quality adjustment unit 410, a dimming control unit 420, a panel controller 430, a peaking control unit 440, and a backlight controller 450.

[0075] The image quality adjustment unit 410 can be a PQ (Picture Quality) tuning module, configured to adjust the sharpness, contrast and color intensity of the received image data before inputting it to the dimming control unit 420.

[0076] The dimming control unit 420 is configured to determine the input grayscale value of each color pixel corresponding to the backlight zone, and the backlight value of each color in the backlight zone, based on the image data; generate driving data for each color pixel based on the input grayscale value and the correction coefficient corresponding to each color pixel, and provide it to the panel controller 430. The panel controller 430 drives the liquid crystal display panel 200 based on the driving data for each color pixel, thereby causing the display panel 200 to display the image content corresponding to the current image data.

[0077] The dimming control unit 420 is also configured to output each backlight value to the peaking control unit 440. Each backlight value is peaked in the peaking control unit 440 according to the average brightness of the current image and then output to the backlight controller 450. The backlight controller 450 generates a backlight driving signal to drive the backlight module 100 to emit light.

[0078] In some embodiments, the image quality adjustment unit 410, the dimming control unit 420, and the peaking control unit 440 can be integrated into a system-on-a-chip, the panel controller 430 can be a timing controller, and the backlight controller 450 can be a backlight driver chip.

[0079] In some embodiments, the control circuit is configured to perform, as Figure 9 The steps are shown. Among them,

[0080] Step 502: Obtain image data and determine the backlight values ​​of each color in the backlight zone based on the image data.

[0081] In some embodiments, the image data is the image data of the current frame, typically in RGB format. After receiving the image data, the control circuit first performs Gamma decoding on the RGB format image data to convert it into a quantity that is linearly related to light intensity. Then, it divides the image data according to the backlight partitions of the backlight module to obtain partition data of the image partitions corresponding to each backlight partition.

[0082] In some embodiments, the partition data includes the input grayscale values ​​of each color pixel in the image partition (the red input grayscale value of the red pixel, the green input grayscale value of the green pixel, and the blue input grayscale value of the blue pixel in the image partition). These three types of input grayscale values ​​collectively determine the color and brightness of each pixel in the image. It can be understood that the input grayscale value of the red pixel corresponding to the backlight partition includes the red input grayscale value (Rin) of each red pixel in its corresponding image partition. The input grayscale value of the green pixel corresponding to the backlight partition includes the green input grayscale value (Gin) of each green pixel in its corresponding image partition. The input grayscale value of the blue pixel corresponding to the backlight partition includes the blue input grayscale value (Bin) of each blue pixel in its corresponding image partition.

[0083] Each input grayscale value typically takes a value within a specific range. For example, in an 8-bit image, the grayscale value ranges from 0 to 255, where 0 represents the minimum brightness of that color channel (i.e., no color component) and 255 represents the maximum brightness of that color channel.

[0084] In some embodiments, after the control circuit acquires the image data, it can further adjust the image data in terms of sharpness, contrast, and color intensity before linearizing it.

[0085] In some embodiments, the control circuit determines the backlight values ​​of each color in the backlight zone according to a first algorithm.

[0086] The first algorithm in the relevant examples can be a maximum value extraction algorithm, an average value extraction algorithm, or a mixed value extraction algorithm, but is not limited to these.

[0087] When the first algorithm is the maximum value extraction algorithm, the control circuit performs regional feature extraction on the partition data of each image partition to extract the maximum value Max(R), the maximum value Max(G), and the maximum value Max(B) of the red input grayscale value, green input grayscale value, and blue input grayscale value in each partition data. The maximum red input grayscale value Max(R) in the partition data is used as the red backlight value of the corresponding backlight partition, the maximum green input grayscale value Max(G) is used as the green backlight value, and the maximum blue input grayscale value Max(B) is used as the blue backlight value.

[0088] When the first algorithm is the average value extraction algorithm, the control circuit performs regional feature extraction on the partition data of each image partition to extract the average value of each red input grayscale value (Rin), each green input grayscale value (Gin), and each blue input grayscale value (Bin) in the partition data. The average value Ave(R) of the red input grayscale value in the partition data is used as the red backlight value of the corresponding backlight partition, the average value Ave(G) of the green input grayscale value is used as the green backlight value, and the average value Ave(B) of the blue input grayscale value is used as the blue backlight value.

[0089] When the first algorithm is a blending value extraction algorithm, the control circuit performs regional feature extraction on the partition data of each image partition to extract the maximum and average values ​​of each red input grayscale value, each green input grayscale value (Gin), and each blue input grayscale value in the partition data. The maximum value Max(R) and the average value Ave(R) of the red input grayscale values ​​in the partition data are then blended according to a preset weight, and the blended value is used as the red backlight value of the corresponding backlight partition. Similarly, the maximum value Max(G) and the average value Ave(G) of the green input grayscale values ​​are blended according to a preset weight, and the blended value is used as the green backlight value. Likewise, the maximum value Max(B) and the average value Ave(B) of the blue input grayscale values ​​are blended according to a preset weight, and the blended value is used as the blue backlight value. As an example, during blending, the weight of the maximum value is A, and the red backlight value r, green backlight value g, and blue backlight value b of the backlight partition can be determined using the following formula:

[0090] r=[A×Max(R)+(1-A) ×Ave(R)] / 2;

[0091] g=[A×Max(G)+(1-A)×Ave(G)] / 2;

[0092] b=[A×Max(B)+(1-A) ×Ave(B)] / 2.

[0093] Among the aforementioned methods for obtaining backlight values, the maximum value extraction algorithm can control backlight brightness to a relatively high level, making it suitable for high-contrast scenes. The average value extraction algorithm is energy-efficient, but backlight brightness tends to decrease during color adjustment, potentially reducing details in bright areas. When using the blended value extraction algorithm, the preset weights can be dynamically adjusted based on the image content (e.g., in high dynamic range scenes, the weight of the maximum value can be increased to blend more maximum values).

[0094] Step 504: Drive the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone according to the blue backlight value of the backlight zone; drive the red light-emitting chip and the green light-emitting chip in the backlight zone according to the red backlight value and the green backlight value of the backlight zone respectively.

[0095] Within the backlight cycle corresponding to the current frame, the control circuit synchronously drives each light-emitting chip in the backlight zone. When driving each green light-emitting chip in the backlight zone, the green light-emitting chip is driven to emit light or not emit light based on the green backlight value of the backlight zone. When the green light-emitting chip emits light, the brightness of the emitted green light can match the brightness requirement corresponding to the green backlight value (the brightness of the green light is equal to the brightness corresponding to the green backlight value, or the difference between the two is within an acceptable range). When driving each red light-emitting chip in the backlight zone, the red light-emitting chip is driven to emit light or not emit light based on the red backlight value of the backlight zone. When the red light-emitting chip emits light, the brightness of the emitted red light can match the brightness requirement corresponding to the red backlight value (the brightness of the red light is equal to the brightness corresponding to the red backlight value, or the difference between the two is within an acceptable range). When driving the two blue light-emitting chips in the backlight zone, the first blue light-emitting chip and the second blue light-emitting chip are driven to output blue light based on the blue backlight value of the backlight zone. The combined blue light brightness of the two blue light-emitting chips can match the brightness requirement corresponding to the blue backlight value (the brightness of the blue light is equal to the brightness corresponding to the blue backlight value, or the difference between the two is within an acceptable range).

[0096] In some embodiments, the brightness percentage of each blue light-emitting chip in the mixed blue light brightness of the two blue light-emitting chips can be a fixed value for easy control. For example, the percentages of the first blue light output by the first blue light-emitting chip and the second blue light output by the second blue light-emitting chip are 50% and 50%, respectively. Another example is that the percentages of the first blue light output by the first blue light-emitting chip and the second blue light output by the second blue light-emitting chip are 60% and 40%, respectively. In other embodiments, the control circuit can dynamically determine the percentage of blue light emitted by the two blue chips based on the backlight values ​​of each color in the backlight zone, allowing for dynamic adjustment according to actual conditions and resulting in better light emission.

[0097] The aforementioned display device includes a liquid crystal display panel, a backlight module, and a control circuit. The backlight module's backlight zones include at least one light-emitting unit, which comprises a red light-emitting chip, a green light-emitting chip, a first blue light-emitting chip, and a second blue light-emitting chip. The wavelength of the blue light emitted by the first blue light-emitting chip is shorter than the wavelength of the blue light emitted by the second blue light-emitting chip. The shorter wavelength of the first blue light-emitting chip is beneficial for improving the color reproduction capability of deep blue and magenta, while the longer wavelength of the second blue light-emitting chip is beneficial for improving the color reproduction capability of cyan. During the control process, the control circuit determines the backlight values ​​of each color in the backlight zone based on image data, and drives the first and second blue light-emitting chips in the backlight zone according to the blue backlight value of the backlight zone. It also drives the red and green light-emitting chips in the backlight zone according to the red and green backlight values, respectively. Therefore, this display device can simultaneously reproduce a wide color gamut of magenta and cyan, significantly improving color gamut performance.

[0098] By dynamically controlling the red light-emitting chip, green light-emitting chip, first blue light-emitting chip, and second blue light-emitting chip based on image data, the following can be obtained: Figure 10 The CIE1976 u'v' chromaticity diagram is shown. The chromaticity point when only the first blue LED is lit and only the blue pixels of the panel are activated is B1; the chromaticity point when only the second blue LED is lit and only the blue pixels of the panel are activated is B2; the chromaticity point when only the red LED is lit and only the red pixels of the panel are activated is R; and the chromaticity point when only the green LED is lit and only the green pixels of the panel are activated is G. It can be seen that the display device of this embodiment can obtain a quadrilateral color gamut formed by connecting the high-saturation RGB1B2 chromaticity points, possessing wide color gamut color reproduction performance and significantly improving the coverage of SOCS natural colors.

[0099] In some embodiments, the control circuit is further configured to perform the following steps:

[0100] The backlight values ​​of each color in the backlight zone are calculated to obtain the color data corresponding to the backlight zone.

[0101] Color data includes saturation and hue. The HSV (Hue-Saturation-Value) color space is a color space that calculates hue (H), saturation (S), and lightness (V) using RGB values. For example, if the red backlight value is r, the green backlight value is g, and the blue backlight value is b, when determining the hue (H) and saturation (S) of a backlight zone based on RGB values, first calculate the maximum value (Max(r, g, b) and the minimum value (Min(r, g, b)) among the red backlight value (r), green backlight value (g), and blue backlight value (b), then obtain the difference Δ between the maximum and minimum values ​​according to Formula 1.

[0102] Δ = Max(r, g, b) - Min(r, g, b), Formula 1;

[0103] The hue H can be calculated using formulas 2-4:

[0104] When r is the largest among r, g, and b, H = 60 × (gb) / Δ, Formula 2;

[0105] When g is the largest among r, g, and b, H = 60 × (br) / Δ + 120, Formula 3;

[0106] When b is the largest among r, g, and b, H = 60 × (rg) / Δ + 240, Formula 4;

[0107] The saturation S can be calculated using formula 5:

[0108] S = Δ / Max(r, g, b), Formula 5.

[0109] In some embodiments, hue and saturation can also be calculated using other methods.

[0110] Furthermore, when the saturation corresponding to the backlight zone is less than a first preset value, the control circuit is configured to perform the following steps:

[0111] Based on the blue backlight value of the backlight zone, the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are driven by a hybrid system.

[0112] The first preset value can be set according to the actual situation, such as 98%, 90%, etc. As an example, the first preset value is 100%.

[0113] When the saturation of the backlight zone is lower than the first preset value, it is determined that the zone may display non-pure color or low saturation scene. By mixing two blue light-emitting chips, it is beneficial to reproduce the wide color gamut colors of magenta and cyan, and improve the color gamut performance.

[0114] When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, the control circuit is configured to perform the following steps:

[0115] Drive the first blue light-emitting chip and / or the second blue light-emitting chip in the backlight zone according to the blue backlight value of the backlight zone.

[0116] When the saturation of a backlight zone reaches a first preset value, it is determined that the zone may display a solid color or a high-saturation scene. At this point, the control circuit can further combine the hue corresponding to the backlight zone to accurately determine the color range of the image to be displayed. Then, based on the blue requirement characteristics of the color range, it determines which blue LED chip to drive individually, or to drive both blue LED chips in combination. By selectively driving the corresponding blue chips, the blue and blue-related colors in the image can be reproduced more accurately.

[0117] In some embodiments, when the saturation corresponding to the backlight zone is greater than or equal to a first preset value, the control circuit executes the following steps when driving the first blue light-emitting chip and / or the second blue light-emitting chip in the backlight zone according to the blue backlight value of the backlight zone:

[0118] When the saturation of the backlight zone is greater than or equal to the first preset value and the hue of the backlight zone is in the first hue range, the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are mixed and driven according to the blue backlight value of the backlight zone.

[0119] When the saturation of the backlight zone is greater than or equal to the first preset value and the hue of the backlight zone is in the second hue range, the second blue light-emitting chip is driven according to the blue backlight value of the backlight zone, and the first blue light-emitting chip is not driven.

[0120] When the saturation of the backlight zone is greater than or equal to the first preset value, and the hue of the backlight zone is in the third hue range, the first blue light-emitting chip is driven according to the blue backlight value of the backlight zone, and the second blue light-emitting chip is not driven.

[0121] When converting to the HSV color space, the R primary color point is converted to a hue angle of 0 degrees, and the G primary color point is converted to a hue angle of 120 degrees. The B1 primary color point is assigned a first blue hue angle of 240 degrees in the HSV color space. The hue angle of the B2 primary color point can be determined by the following method: First, calculate... Figure 11 The chromaticity point C is the intersection of the line connecting the white point W (D65) and B2 with the line connecting G and B1. The mixing ratio of G and B1 that can reproduce the chromaticity of C is then calculated. Finally, the hue angle is calculated based on this mixing ratio to determine the hue angle of B2. For example, when using a second blue light-emitting chip with a wavelength of 465nm, the hue angle of the primary color point B2 is approximately 220 degrees.

[0122] Furthermore, such as Figure 12 As shown, Figure 12 yes Figure 11 The diagram shows the polar coordinate representation of chromaticity information in the HSV color space. The circle can be divided into multiple hue intervals, and the color representation requirements for cyan, dark blue, and magenta are different in each interval.

[0123] The first hue range is the blue hue range of the second blue light-emitting chip. Figure 12 The blue hue of the light from point B2 in the first blue light-emitting chip ( Figure 12 The hue range of point B1 in the diagram is, for example, 220 degrees to 240 degrees. The second hue range is determined by the green hue of the green light emitted by the green light-emitting chip. Figure 12 The hue range from point G in the first blue light-emitting chip to the blue hue of the second blue light-emitting chip, for example, 120 degrees to 220 degrees. The third hue range is from the blue hue of the first blue light-emitting chip to the red hue of the red light-emitting chip. Figure 12 The hue range from point R in the diagram to the green hue, for example, 240 degrees to 120 degrees.

[0124] In the above embodiments, when the saturation corresponding to the backlight zone is greater than or equal to a first preset value, and the hue is within the first hue range, the first and second blue light-emitting chips are driven in combination. This fully utilizes the wavelength characteristics of both chips to present a deep and rich blue tone within this range, improving the color deviation problem that may occur with traditional single-chip driving. The second hue range covers colors from cyan to blue-green. When the hue is within this range, the second blue light-emitting chip is driven alone. Since the hue angle of the second blue light-emitting chip is more biased towards cyan, driving it alone can accurately present the clear and vibrant cyan colors within this range, meeting the delicate color requirements of some scenarios. The third hue range includes colors from deep blue to magenta. When the hue is within this range, the first blue light-emitting chip is driven alone. The short wavelength characteristics of the first blue light-emitting chip enable it to accurately output high-purity deep blue. In deep blue scenes, as well as in scenes where it is mixed with red to present a magenta tone, the accuracy and vividness of the colors can be improved, meeting the requirements of a wide color gamut.

[0125] In some embodiments, when the hue corresponding to the backlight partition is within the first hue range, the control circuit performs the following steps when it mixes and drives the first blue light-emitting chip and the second blue light-emitting chip in the backlight partition according to the blue backlight value of the backlight partition:

[0126] When the saturation of the backlight zone is greater than or equal to the first preset value and the hue of the backlight zone is within the first hue range, a first blue backlight value is generated based on the blue backlight value of the backlight zone to drive the first blue light-emitting chip, and a second blue backlight value is generated to drive the second blue light-emitting chip.

[0127] Among them, the brightness difference between the blue light output by the first blue light-emitting chip and the blue light output by the second blue light-emitting chip is less than a preset threshold.

[0128] The preset threshold can be set according to actual conditions, for example, within 3%-15%. As an example, when the saturation of the backlight zone is 100% and the hue of the backlight zone is within the first hue range, the first blue backlight value used to drive the first blue LED chip and the second blue backlight value used to drive the second blue LED chip are calculated based on the blue backlight value of the backlight zone and are equal. Ideally, the proportion of blue light output from the two blue LED chips in the mixed blue light is 50% each. In practical applications, the brightness of the two blue LED chips may differ to some extent, but the difference is less than the preset threshold.

[0129] By controlling the brightness difference between the two blue lights in the mixed blue light, a blue with an intermediate hue between the two blues can be displayed when the hue is in the first hue range and the saturation is high, such as a blue with a hue angle of 230 degrees, thereby achieving wide color gamut performance.

[0130] In some embodiments, when the control circuit performs the step of mixing and driving the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone according to the blue backlight value of the backlight zone when the saturation is less than a first preset value, the specific steps are as follows:

[0131] When the saturation is less than the first preset value, the mixing ratio corresponding to the saturation of the backlight zone is determined according to the hue range of the hue corresponding to the backlight zone and the preset correspondence.

[0132] Based on the blue backlight value of the backlight zone and the corresponding mixing ratio, the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are mixed and driven.

[0133] In this embodiment, there are different preset correspondences for multiple hue ranges. The preset correspondence is the correspondence between saturation and mixing ratio. That is, when the hue is in different ranges, the correspondence between mixing ratio and saturation is different.

[0134] By adopting the correspondence with the hue range, the mixing ratio corresponding to the saturation of the backlight zone can be determined, which can make the mixing ratio more compatible with the color state of the current image. Then, based on the mixing ratio, the first blue light-emitting chip and the second blue light-emitting chip can be driven, which can make the color performance in the final mixed light better.

[0135] In some embodiments, when the saturation is less than a first preset value, when driving the two blue light-emitting chips in the backlight zone, it is necessary to determine the backlight value of each blue light-emitting chip based on the blue backlight value and the mixing ratio, and then drive the two blue light-emitting chips separately. In some embodiments, the control circuit is further configured to:

[0136] A first blue backlight value is determined based on the blue backlight value of the backlight zone and the proportion of the first blue light in the mixing ratio, and the first blue light-emitting chip in the backlight zone is driven based on the first blue backlight value; a second blue backlight value is determined based on the blue backlight value of the backlight zone and the proportion of the second blue light in the mixing ratio, and the second blue light-emitting chip in the backlight zone is driven based on the second blue backlight value.

[0137] Assuming that in the mixing ratio setting, the proportion of blue light output by the first blue LED chip is k(B1), the proportion of blue light output by the second blue LED chip is k(B2), and the blue backlight value is b, then the first blue backlight value B1 LEDout =b×k(B1), the second blue backlight value B2 LEDout =b×k(B2). This can be understood as the blue backlight value b=B1. LEDout +B2 LEDout=b×k(B1)+b×k(B2). Furthermore, the driving circuit drives each first blue light-emitting chip in the backlight zone according to the first blue backlight value, and drives each second blue light-emitting chip in the backlight zone according to the second blue backlight value. The final emitted blue light brightness can match the brightness requirement corresponding to the blue backlight value.

[0138] When the light-emitting chips are lit, the same color light-emitting chips in the same backlight zone will be supplied with the same driving signal (e.g., the same driving current and / or the same duty cycle PWM signal) to ensure that their light intensity is consistent and improve backlight consistency.

[0139] In some embodiments, the preset correspondence includes a first correspondence corresponding to a first hue range, a second correspondence corresponding to a second hue range, and a third correspondence corresponding to a third hue range.

[0140] In some embodiments, in the first correspondence, the proportion of blue light output by the first blue light-emitting chip decreases as the saturation increases; the proportion of blue light output by the second blue light-emitting chip increases as the saturation increases.

[0141] In this embodiment, when the hue corresponding to the backlight partition is in the first hue range, the proportion of the first blue light decreases as the saturation increases, while the proportion of the second blue light increases as the saturation increases. This can increase the proportion of the second blue light emitted by the second blue light-emitting chip and improve the display effect of the cyan color gamut.

[0142] In some embodiments, in the second correspondence, the proportion of blue light output by the first blue light-emitting chip decreases as the saturation increases; the proportion of blue light output by the second blue light-emitting chip increases as the saturation increases.

[0143] In this embodiment, when the hue corresponding to the backlight partition is in the second hue range, the proportion of the first blue light decreases as the saturation increases, while the proportion of the second blue light increases as the saturation increases. This can increase the proportion of the second blue light emitted by the second blue light-emitting chip, fully utilize its cyan reproduction advantage, ensure high saturation cyan, and improve the display effect.

[0144] In some embodiments, the rate of change of the proportion of blue light output by the first blue light-emitting chip in the first correspondence is less than the rate of change of the proportion of blue light output by the first blue light-emitting chip in the second correspondence. That is, when the change in saturation is the same, the change in the proportion of blue light output by the first blue light-emitting chip in the first correspondence is less than the change in the proportion of blue light output by the first blue light-emitting chip in the second correspondence. Compared to the second hue range, the rate of change of the proportion of blue light output by the first and second blue light-emitting chips is relatively gradual for the first hue range, which can improve color gamut continuity, achieve smooth color gamut transition, and enhance display effect.

[0145] In some embodiments, in the third correspondence, the proportion of blue light output by the first blue light-emitting chip increases with the increase of the saturation of the backlight partition; the proportion of blue light output by the second blue light-emitting chip decreases with the increase of the saturation of the backlight partition.

[0146] Because the first blue LED has higher color purity and brightness efficiency in the deep blue to red and magenta regions, and the second blue LED excels in color reproduction in the cyan region, when the hue corresponding to the backlight zone is in the third hue range, the proportion of blue light output by the first blue LED increases with increasing saturation, while the proportion of blue light output by the second blue LED decreases with increasing saturation. This can increase the proportion of blue light from the first LED, enhance the high-saturation color purity in the deep blue to red range, and reduce color shift caused by spectral mismatch in the non-dominant areas of the second blue LED, thereby improving the display effect of the display device. Furthermore, increasing the luminous proportion of the first blue LED can leverage its high energy-saving performance to improve the energy efficiency of the display device.

[0147] In some embodiments, the first, second, and third correspondences can be pre-stored in the driving circuit in the form of a lookup table, and the proportional data in the lookup table can be calculated by linear interpolation. In other embodiments, the first, second, and third correspondences can also be pre-stored in the driving circuit in the form of a relational formula or a corresponding curve.

[0148] In some embodiments, the control circuit is further configured to:

[0149] In the first, second, and third correspondences, when the saturation of the backlight zone is 0, the proportion of blue light output by the first blue light-emitting chip is greater than the proportion of blue light output by the second blue light-emitting chip.

[0150] The specific proportion of blue light output from the first and second blue light-emitting chips can be determined based on their wavelengths. For example, using a first blue light-emitting chip with a wavelength of 450nm and a second blue light-emitting chip with a wavelength of 470nm, when the saturation of the backlight zone is 0, the first blue light-emitting chip outputs 70% of the blue light, and the second blue light-emitting chip outputs 30%. This reduces the total intensity of the light emission spectrum below 455nm in the 400-500nm wavelength range to below 50%, thus reducing potential eye damage.

[0151] In this embodiment, at low saturation, the first blue light is mainly provided by the first blue light-emitting chip. The energy-saving performance of the short-wavelength first blue light-emitting chip can be utilized to improve the energy efficiency of the display device. Since the second blue light-emitting chip has more advantages in suppressing the eye damage caused by blue light below 455nm, when displaying colorless white (where the saturation is 0), a small amount of blue light is mixed with the output of the second blue light-emitting chip, which can improve the visual friendliness performance.

[0152] In some embodiments, the first correspondence is linear, where when the saturation is 0, the proportions of both blue lights in the mixing ratio are greater than 0. For example, the first blue light accounts for 70%, and the second blue light accounts for 30%. The resulting mixed blue light can display an intermediate shade of blue between the two, thus achieving wide color gamut performance. When the saturation is 100%, the proportions of the first blue light and the second blue light are 50%. Between 0 and 100 saturation levels, the mixing ratio of the blue light output from the two blue light-emitting chips changes linearly according to the ratio at 0 and 100 saturation levels.

[0153] As an example, the first correspondence is as follows: Figure 13 The curves shown are as follows. The solid line represents the percentage of blue light output from the first blue LED chip, and the dashed line represents the percentage of blue light output from the second blue LED chip.

[0154] In some embodiments, the second correspondence is linear. When the saturation is 100%, the proportion of the first blue light is 0, and the proportion of the second blue light is 100%. When the saturation is 0, the proportions of both blue lights in the mixing ratio are greater than 0. Between 0 and 100 saturation levels, the mixing ratio of the blue light output by the two blue light-emitting chips changes linearly according to the ratio at 0 and 100 saturation levels. As the saturation increases, the proportion of the second blue light emitted by the second blue light-emitting chip gradually increases, fully utilizing its cyan reproduction advantage to ensure high-saturation cyan and improve display performance.

[0155] As an example, the second correspondence is as follows: Figure 14The curves shown are as follows. The solid line represents the percentage of blue light output from the first blue LED chip, and the dashed line represents the percentage of blue light output from the second blue LED chip.

[0156] In some embodiments, the third correspondence is a linear relationship: when the saturation is 100%, the proportion of the first blue light is 100%, and the proportion of the second blue light is 0. When the saturation is 0, the proportions of both blue lights in the mixture are greater than 0. When the saturation is between 0 and 100, the mixing ratio of the blue light output by the two blue light-emitting chips changes linearly according to the ratio when the saturation is 0 and when the saturation is 100.

[0157] As an example, the first correspondence is as follows: Figure 15 The curves shown are as follows. The solid line represents the percentage of blue light output from the first blue LED chip, and the dashed line represents the percentage of blue light output from the second blue LED chip.

[0158] When the hue corresponding to the backlight zone is in the first hue range and the saturation is 100%, by making the first blue light-emitting chip emit light and the second blue light-emitting chip not emit light, the advantage of the first blue light-emitting chip in the deep blue and magenta gamut can be utilized to improve the color reproduction performance.

[0159] When the saturation level is between 0 and 100, the mixing ratio of the blue light output from the two blue LEDs is linearly controlled according to the ratio at saturation levels of 0 and 100. As the saturation level increases, the proportion of blue light output from the first blue LED is gradually increased to enhance the high-saturation color purity in the deep blue to red gamut, thereby improving the display effect of the display device. Moreover, increasing the luminous proportion of the first blue LED can improve the energy-saving performance of the display device.

[0160] In some embodiments of the display device, when the saturation corresponding to the backlight zone is at maximum saturation (saturation is 100%), such as Figure 16- Figure 17 As shown, Figure 16 This indicates the mixing ratio of the output light from the two blue light-emitting chips in the light-emitting unit when the saturation is 100%. The solid line represents the proportion of blue light output by the first blue light-emitting chip, and the dashed line represents the proportion of blue light output by the second blue light-emitting chip. Figure 17This indicates the illumination status of each light-emitting chip in the light-emitting unit when the saturation is 100%. When the hue is in the first hue range (240 degrees - 0 degrees - 120 degrees) from first blue to red and red to green, the short-wavelength first blue light-emitting chip is illuminated, and the second blue light-emitting chip is not illuminated. When the hue is in the second hue range (120 degrees - 220 degrees) from green to second blue, the long-wavelength second blue light-emitting chip is illuminated, and the short-wavelength first blue light-emitting chip is not illuminated. When the hue is in the third hue range (220 degrees - 240 degrees) from second blue to first blue, a mixture of short-wavelength first blue light-emitting chips and long-wavelength second blue light-emitting chips is used.

[0161] When the saturation corresponding to the backlight zone is not at maximum saturation, and the hue is in the first hue range (the hue from first blue to red, and the hue from red to green), both blue light-emitting chips are lit, and in the mixing ratio, the shorter wavelength first blue light-emitting chip outputs a higher proportion of blue light. Figure 18 For example, Figure 18 This shows the lighting status of each light-emitting chip when the saturation is 50%.

[0162] When the color information corresponding to the backlight zone is achromatic (white, saturation of 0), both blue light-emitting chips are lit, and in the mixing ratio, the first blue light-emitting chip with a shorter wavelength outputs a higher proportion of blue light.

[0163] The display device in this embodiment is capable of simultaneously reproducing a wide color gamut of deep blue and cyan. Furthermore, low power consumption is achieved by preferentially using a low-power first blue light-emitting chip. Moreover, visual effectiveness is improved by mixing a second blue light-emitting chip containing less light emission components below 455nm with short-wavelength blue light.

[0164] In some embodiments, the control circuit is further configured to perform the following steps:

[0165] The driving data for each color pixel is generated based on the input grayscale value of each color pixel and the corresponding correction coefficient to drive the liquid crystal display panel.

[0166] The correction coefficients for each color pixel are generated based on the backlight values ​​of each color in the backlight zone corresponding to each color pixel.

[0167] In some embodiments, at the liquid crystal display panel driving level, the control circuit generates precise pixel driving data based on the input grayscale value of each color pixel and the correction coefficient of each color pixel dynamically generated based on the backlight value of the backlight partition. The liquid crystal display panel is driven based on this pixel driving data to synchronously adjust the transmittance of the liquid crystal corresponding to each pixel. This, in turn, through the synergistic effect of partitioned backlight control and pixel compensation, accurately displays the image content.

[0168] In some embodiments, when the control circuit executes the step of generating driving data for each color pixel based on the input grayscale value of each color pixel and the correction coefficient corresponding to each color pixel to drive the liquid crystal display panel, it is specifically configured as follows:

[0169] The red pixel correction coefficient is determined by the reciprocal of the red backlight value of the backlight zone, the green pixel correction coefficient is determined by the reciprocal of the green backlight value of the backlight zone, and the blue pixel correction coefficient is determined by the reciprocal of the blue backlight value of the backlight zone.

[0170] The red correction data for the backlight partition is generated by multiplying the red pixel correction coefficient by the input grayscale value of each red pixel in the backlight partition; the green correction data for the backlight partition is generated by multiplying the green pixel correction coefficient by the input grayscale value of each green pixel in the backlight partition; and the blue correction data for the backlight partition is generated by multiplying the blue pixel correction coefficient by the input grayscale value of each blue pixel in the backlight partition.

[0171] Each red pixel of the LCD panel is driven according to the red correction data corresponding to each backlight zone, each green pixel of the LCD panel is driven according to the green correction data corresponding to each backlight zone, and each blue pixel of the LCD panel is driven according to the blue correction data corresponding to each backlight zone.

[0172] In this embodiment, the control circuit can use the reciprocal of each color backlight value as the corresponding correction coefficient, or multiply the reciprocal of each color backlight value by a specific coefficient, and use the result as the corresponding correction coefficient. As an example, the red backlight value of a backlight zone is the maximum value Max(R) of the red input grayscale value (Rin) of each red pixel in the corresponding image zone; the green backlight value is the maximum value Max(G) of the green input grayscale value (Gin) of each green pixel in the corresponding image zone; and the blue backlight value is the maximum value Max(B) of the blue input grayscale value (Bin) of each blue pixel in the corresponding image zone. The correction coefficient for red pixels is the reciprocal of the red backlight value, i.e., 1 / max(R); the correction coefficient for green pixels is the reciprocal of the green backlight value, i.e., 1 / max(G); and the correction coefficient for blue pixels is the reciprocal of the blue backlight value, i.e., 1 / max(B). In this way, the brightness of each color pixel can be finely adjusted, effectively correcting display deviations caused by backlight factors and improving the display quality of each color portion in the entire image.

[0173] Furthermore, for each color pixel, the product of its input grayscale value and the correction coefficient of that color pixel in its corresponding partition is used as its correction data. The red correction data is Rout = Rin × 1 / r, the green correction data is Gout = Gin × 1 / g, and the blue correction data is Bout = Bin × 1 / b. Taking the maximum backlight value as an example, the red correction data for the red pixel is Rout = 1 / max(R) × Rin, the green correction data for the green pixel is Gout = 1 / max(G) × Gin, and the blue correction data for the blue pixel is Bout = 1 / max(B) × Bin.

[0174] The red correction data for each backlight zone includes the red correction data for each red pixel in the corresponding image zone; the green correction data includes the green correction data for each green pixel in the corresponding image zone; and the blue correction data includes the blue correction data for each blue pixel in the corresponding image zone. By using the product of the input grayscale value of each color pixel and its corresponding correction coefficient as its correction data, the brightness of each pixel can be adjusted specifically to compensate for display deviations caused by backlight factors. This ensures the display quality of the green, red, and blue portions of the image, improving the overall display quality of the display device.

[0175] The control circuit drives each red pixel, green pixel, and blue pixel of the liquid crystal display panel according to the red correction data, green correction data, and blue correction data corresponding to each backlight zone, and adjusts the transmittance of the liquid crystal molecules to achieve grayscale correction of each color, so that the red pixels, green pixels, and blue pixels at different positions can be accurately displayed according to the corrected grayscale values.

[0176] In the aforementioned display device, the control circuit achieves dual regulation of the luminous brightness and luminous color of each backlight zone. Adjacent zones may influence each other. The embodiments in this application are described using the case where there is no light influence from adjacent areas. If the influence of adjacent zones is considered, the control circuit will also combine the backlight overflow from adjacent areas to its own area and modify the backlight value of this zone. Furthermore, it generates pixel driving data based on the backlight values ​​of each color, ensuring that the image finally displayed on the liquid crystal display panel is consistent with the image to be displayed.

[0177] In some embodiments, a driving method for the above-described display device is also provided, the method comprising the following steps:

[0178] Acquire image data and determine the backlight values ​​for each color in the backlight zone based on the image data;

[0179] Based on the blue backlight value of the backlight zone, drive the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone; based on the red backlight value and the green backlight value of the backlight zone, drive the red light-emitting chip and the green light-emitting chip in the backlight zone respectively.

[0180] In some embodiments, the step of driving the first blue light-emitting chip and the second blue light-emitting chip in the backlight partition according to the blue backlight value of the backlight partition includes the following steps:

[0181] The backlight values ​​of each color in the backlight zone are calculated to obtain the color data corresponding to the backlight zone, including saturation.

[0182] When the saturation corresponding to the backlight zone is less than the first preset value, the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are driven by mixing according to the blue backlight value of the backlight zone.

[0183] When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, the first blue light-emitting chip and / or the second blue light-emitting chip in the backlight zone are driven according to the blue backlight value of the backlight zone.

[0184] In some embodiments, when the saturation corresponding to the backlight zone is greater than or equal to a first preset value, driving the first blue light-emitting chip and / or the second blue light-emitting chip in the backlight zone according to the blue backlight value of the backlight zone includes the following steps:

[0185] When the saturation of the backlight zone is greater than or equal to the first preset value and the hue of the backlight zone is within the first hue range, the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are mixed and driven according to the blue backlight value of the backlight zone; the first hue range is the hue range from the blue light hue of the second blue light-emitting chip to the blue light hue of the first blue light-emitting chip.

[0186] When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, and the hue corresponding to the backlight zone is in the second hue range, the second blue light-emitting chip is driven according to the blue backlight value of the backlight zone, and the first blue light-emitting chip is not driven; the second hue range is the hue range from the green hue of the green light-emitting chip to the blue hue of the second blue light-emitting chip.

[0187] When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, and the hue corresponding to the backlight zone is in the third hue range, the first blue light-emitting chip is driven according to the blue backlight value of the backlight zone, and the second blue light-emitting chip is not driven; the third hue range is the hue range from the blue hue of the first blue light-emitting chip to the red hue of the red light-emitting chip to the green hue.

[0188] In some embodiments, when the saturation corresponding to the backlight partition is greater than or equal to a first preset value and the hue corresponding to the backlight partition is within a first hue range, the step of mixing and driving the first blue light-emitting chip and the second blue light-emitting chip in the backlight partition according to the blue backlight value of the backlight partition includes the following steps:

[0189] When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, and the hue corresponding to the backlight zone is located in the first hue range, a first blue backlight value is generated based on the blue backlight value of the backlight zone to drive the first blue light-emitting chip, and a second blue backlight value is generated to drive the second blue light-emitting chip, wherein the brightness difference between the blue light output by the first blue light-emitting chip and the blue light output by the second blue light-emitting chip is less than a preset threshold.

[0190] In some embodiments, when the saturation corresponding to the backlight partition is less than a first preset value, the step of mixing and driving the first blue light-emitting chip and the second blue light-emitting chip in the backlight partition according to the blue backlight value of the backlight partition includes the following steps:

[0191] When the saturation is less than the first preset value, the mixing ratio corresponding to the saturation of the backlight zone is determined according to the hue range of the hue corresponding to the backlight zone and the preset correspondence.

[0192] Based on the blue backlight value of the backlight zone and the corresponding mixing ratio, the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are mixed and driven.

[0193] In some embodiments, the method further includes:

[0194] The driving data for each color pixel is generated based on the input grayscale value of each color pixel and the correction coefficient corresponding to each color pixel to drive the liquid crystal display panel; wherein, the correction coefficient corresponding to each color pixel is generated based on the color backlight value of each color backlight zone corresponding to each color pixel.

[0195] In some embodiments, the step of generating driving data for each color pixel to drive the liquid crystal display panel based on the input grayscale value of each color pixel and the correction coefficient corresponding to each color pixel includes the following steps:

[0196] The red pixel correction coefficient is determined by the reciprocal of the red backlight value of the backlight zone, the green pixel correction coefficient is determined by the reciprocal of the green backlight value of the backlight zone, and the blue pixel correction coefficient is determined by the reciprocal of the blue backlight value of the backlight zone.

[0197] The red correction data for the backlight partition is generated by multiplying the red pixel correction coefficient by the input grayscale value of each red pixel in the backlight partition; the green correction data for the backlight partition is generated by multiplying the green pixel correction coefficient by the input grayscale value of each green pixel in the backlight partition; and the blue correction data for the backlight partition is generated by multiplying the blue pixel correction coefficient by the input grayscale value of each blue pixel in the backlight partition.

[0198] Each red pixel of the LCD panel is driven according to the red correction data corresponding to each backlight zone, each green pixel of the LCD panel is driven according to the green correction data corresponding to each backlight zone, and each blue pixel of the LCD panel is driven according to the blue correction data corresponding to each backlight zone.

[0199] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0200] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0201] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A display device, characterized in that, include: LCD display panel, used to display images; A backlight module is used to provide a light source for the liquid crystal display panel; The backlight module includes multiple backlight zones, and each backlight zone includes at least one light-emitting unit. The light-emitting unit includes a red light-emitting chip, a green light-emitting chip, a first blue light-emitting chip, and a second blue light-emitting chip. The wavelength of the blue light emitted by the first blue light-emitting chip is shorter than the wavelength of the blue light emitted by the second blue light-emitting chip. A control circuit, connected to the liquid crystal display panel and the backlight module, is configured as follows: Acquire image data, and determine the backlight values ​​of each color in the backlight zone based on the image data; Drive the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone according to the blue backlight value of the backlight zone; The red backlight value and the green backlight value of the backlight zone are used to drive the red light-emitting chip and the green light-emitting chip in the backlight zone, respectively.

2. The display device as described in claim 1, characterized in that, The control circuit is also configured to: The backlight values ​​of each color in the backlight zone are calculated to obtain the color data corresponding to the backlight zone, and the color data includes saturation. When the saturation corresponding to the backlight zone is less than a first preset value, the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are mixed and driven according to the blue backlight value of the backlight zone. When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, the first blue light-emitting chip and / or the second blue light-emitting chip in the backlight zone are driven according to the blue backlight value of the backlight zone.

3. The display device as described in claim 2, characterized in that, The color data also includes hue; the control circuit is further configured to: When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, and the hue corresponding to the backlight zone is located in the first hue range, the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are mixed and driven according to the blue backlight value of the backlight zone; the first hue range is the hue range from the blue light hue of the second blue light-emitting chip to the blue light hue of the first blue light-emitting chip; When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, and the hue corresponding to the backlight zone is located in the second hue range, the second blue light-emitting chip is driven according to the blue backlight value of the backlight zone, and the first blue light-emitting chip is not driven; the second hue range is the hue range from the green hue of the green light-emitting chip to the blue hue of the second blue light-emitting chip; When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, and the hue corresponding to the backlight zone is located in the third hue range, the first blue light-emitting chip is driven according to the blue backlight value of the backlight zone, and the second blue light-emitting chip is not driven; the third hue range is the hue range from the blue hue of the first blue light-emitting chip to the red hue of the red light-emitting chip to the green hue.

4. The display device as described in claim 3, characterized in that, The control circuit is also configured to: When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, and the hue corresponding to the backlight zone is located in the first hue range, a first blue backlight value is generated based on the blue backlight value of the backlight zone to drive the first blue light-emitting chip, and a second blue backlight value is generated to drive the second blue light-emitting chip, wherein the brightness difference between the blue light output by the first blue light-emitting chip and the blue light output by the second blue light-emitting chip is less than a preset threshold.

5. The display device as described in claim 3, characterized in that, The control circuit is also configured to: When the saturation is less than the first preset value, the mixing ratio corresponding to the saturation of the backlight zone is determined according to the hue range of the hue corresponding to the backlight zone and the preset correspondence. Based on the blue backlight value of the backlight zone and the corresponding mixing ratio, the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are mixed and driven.

6. The display device as claimed in claim 5, characterized in that, The preset correspondence includes a first correspondence corresponding to the first hue interval, a second correspondence corresponding to the second hue interval, and a third correspondence corresponding to the third hue interval; In the first correspondence, the proportion of blue light output by the first blue light-emitting chip decreases as the saturation increases; the proportion of blue light output by the second blue light-emitting chip increases as the saturation increases. In the second correspondence, the proportion of blue light output by the first blue light-emitting chip decreases as the saturation increases; the proportion of blue light output by the second blue light-emitting chip increases as the saturation of the backlight zone increases. In the third correspondence, the proportion of blue light output by the first blue light-emitting chip increases with the increase of the saturation; the proportion of blue light output by the second blue light-emitting chip decreases with the increase of the saturation of the backlight zone.

7. The display device as claimed in claim 6, characterized in that, In the first correspondence, the second correspondence, and the third correspondence, when the saturation of the backlight zone is 0, the proportion of blue light output by the first blue light-emitting chip is greater than the proportion of blue light output by the second blue light-emitting chip.

8. The display device according to claim 1, characterized in that, The control circuit is also configured to: The color pixel driving data is generated based on the input grayscale value of each color pixel and the correction coefficient corresponding to each color pixel to drive the liquid crystal display panel; wherein, the correction coefficient corresponding to each color pixel is generated based on the color backlight value of each backlight zone corresponding to each color pixel.

9. A driving method for a display device, characterized in that, For a display device as described in any one of claims 1-8, the driving method includes: Acquire image data, and determine the backlight values ​​of each color in the backlight zone based on the image data; The first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are driven according to the blue backlight value of the backlight zone; the red light-emitting chip and the green light-emitting chip in the backlight zone are driven according to the red backlight value and the green backlight value of the backlight zone, respectively.

10. The driving method for a display device as described in claim 9, characterized in that, The step of driving the first blue light-emitting chip and the second blue light-emitting chip in the backlight partition according to the blue backlight value of the backlight partition includes: The backlight values ​​of each color in the backlight zone are calculated to obtain the color data corresponding to the backlight zone, and the color data includes saturation. When the saturation corresponding to the backlight zone is less than a first preset value, the first blue light-emitting chip and the second blue light-emitting chip in the backlight zone are mixed and driven according to the blue backlight value of the backlight zone. When the saturation corresponding to the backlight zone is greater than or equal to the first preset value, the first blue light-emitting chip and / or the second blue light-emitting chip in the backlight zone are driven according to the blue backlight value of the backlight zone.

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