Dual-color light source liquid crystal display backlight control method and display device

Abstract

The application provides a dual-color light source liquid crystal display backlight control method and a display device. The steps of the dual-color light source liquid crystal display backlight control method include: obtaining a to-be-displayed image frame to obtain RGB gray scale data of the to-be-displayed image frame; obtaining a sub-pixel control signal and a light source control signal corresponding to a dual-color light source at a current moment according to the RGB gray scale data; outputting the light source control signal to a blue light source and a green light source of the dual-color light source, and outputting a sub-pixel control signal to the liquid crystal layer, wherein the sub-pixel control signal drives the liquid crystal layer to output pure three-color light. The application realizes pure three-color light output through a dual-color light source exciting red fluorescent powder glue. Since there is no transmission spectrum overlap between red light and blue light, the penetration path of non-target color light is fundamentally eliminated, color deviation is reduced, and the color restoration accuracy of the whole machine picture is improved.

Description

Technical Field

[0001] This invention relates to the field of liquid crystal backlight display control technology, and in particular to a dual-color light source liquid crystal display backlight control method and display device. Background Technology

[0002] Liquid crystal display devices typically consist of a liquid crystal layer and a backlight module. The liquid crystal layer contains red, green, and blue sub-pixels arranged in an array. Each sub-pixel window allows a wide range of light wavelengths to pass through, and there are overlapping areas between their transmission spectra.

[0003] To address these issues, existing technologies in this field have proposed several improvements. One such solution uses red, green, and blue LEDs as the backlight and incorporates zone dynamic control technology to achieve color correction by independently adjusting the luminous intensity of each color LED. However, this solution requires separate packaging and configuration of independent driving circuits for each of the three colors of LEDs, significantly increasing the number of LED components in the backlight module, making the structure more complex, and resulting in higher overall manufacturing costs, which is not conducive to large-scale mass production. Simultaneously, there is also an architecture that uses blue LEDs to excite phosphors to generate white light, suppressing the leakage of non-target wavelengths by optimizing the phosphor formulation or adding a filter layer. However, both of these solutions fail to fundamentally eliminate the color penetration problem caused by the overlap of transmission spectra between sub-pixels, leading to chromaticity value shifts and reduced color reproduction accuracy of the overall screen.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a dual-color light source liquid crystal display backlight control method and display device to solve the problems of overlapping transmission spectra between liquid crystal layer sub-pixels in the existing backlight control method, resulting in color shift and reduced color reproduction accuracy of the overall screen.

[0006] The technical solution of the present invention is as follows: This invention discloses a method for controlling the backlight of a dual-color light source liquid crystal display, which is used to control a dual-color light source backlight liquid crystal panel. The dual-color light source backlight liquid crystal panel includes a liquid crystal layer and a plurality of arrayed dual-color light sources. The dual-color light sources include a blue light source and a green light source, and a red phosphor paste is filled above the blue light source. The liquid crystal layer is disposed above the plurality of arrayed dual-color light sources and is provided with a plurality of color sub-pixels. The steps include: Obtain the image frame to be displayed and get the RGB grayscale data of the image frame to be displayed; Based on the RGB grayscale data, the sub-pixel control signal and the light source control signal corresponding to the current output dual-color light source are obtained; The light source control signal is output to the blue and green light sources of the dual-color light source, and the sub-pixel control signal is output to the liquid crystal layer. The sub-pixel control signal drives the liquid crystal layer to output pure tri-color light.

[0007] In a further embodiment of the present invention, the step of outputting the light source control signal to the blue and green light sources of the dual-color light source, and outputting the sub-pixel control signal to the liquid crystal layer, wherein the sub-pixel control signal drives the liquid crystal layer to output pure tri-color light includes: Output light source control signals to the blue light source and the green light source. The blue light source emits red-blue mixed light according to the light source control signals, and the green light source emits green light according to the light source control signals. The sub-pixel control signal is output to the liquid crystal layer. The color sub-pixel includes a blue sub-pixel, a red sub-pixel, and a green sub-pixel. The color sub-pixel is used to adjust the transmittance of the corresponding color sub-pixel according to the sub-pixel control signal, filter stray light from the red-blue mixed light and the green light, and transmit pure red light, pure green light, and pure blue light.

[0008] In a further embodiment of the present invention, the blue light sources of the plurality of arrayed dual-color light sources are interconnected and connected to a first duty cycle signal; the green light sources of the plurality of arrayed dual-color light sources are interconnected and connected to a second duty cycle signal. The light source control signal includes a first duty cycle signal and a second duty cycle signal; the output sub-pixel control signal includes a red transmittance signal, a blue transmittance signal, and a green transmittance signal; the step of outputting the light source control signal to the blue light source and the green light source, wherein the blue light source emits red-blue mixed light according to the light source control signal, and the green light source emits green light according to the light source control signal includes: Extract the red and blue grayscale data from the RGB grayscale data, and calculate the first duty cycle signal based on the red and blue grayscale data; Extract the green grayscale data from the RGB grayscale data, and calculate the second duty cycle signal based on the green grayscale data; The global operating brightness of the blue light source and the green light source of the arrayed dual-color light sources are controlled according to the first duty cycle signal and the second duty cycle signal, respectively.

[0009] A further provision of the present invention includes the step of controlling the global operating brightness of the blue light source and the green light source of the plurality of arrayed dual-color light sources according to the first duty cycle signal and the second duty cycle signal, respectively, comprising: Acquire the first duty cycle signal, and output the red and blue working control current to the blue light source of the array of dual-color light sources according to the first duty cycle signal; Acquire the second duty cycle signal, and output the green light working control current to the green light source of the array of dual-color light sources according to the second duty cycle signal; The global operating brightness of the blue light source of the arrayed dual-color light sources is controlled by the red-blue operating control current; the global operating brightness of the green light source of the arrayed dual-color light sources is controlled by the green light operating control current.

[0010] In a further embodiment of the present invention, the dual-color backlight liquid crystal panel is divided into several partitions, each partition including a dual-color light source; the light source control signal includes a first duty cycle signal and a second duty cycle signal; the output sub-pixel control signal includes a red transmittance signal, a blue transmittance signal, and a green transmittance signal; the step of outputting the light source control signal to the blue light source and the green light source, wherein the blue light source emits red-blue mixed light according to the light source control signal, and the green light source emits green light according to the light source control signal, includes: The RGB grayscale data is segmented according to the aforementioned partitions, and the RGB grayscale data of the dual-color light source region in the corresponding partition is found. Extract the red and blue grayscale data from the RGB grayscale data of the region, and calculate the blue light source current based on the red and blue grayscale data; Extract the green grayscale data from the RGB grayscale data of the region, and calculate the green light source current based on the green grayscale data; The working brightness of the blue light source and the green light source is controlled according to the current of the blue light source and the current of the green light source, respectively.

[0011] In a further embodiment of the present invention, the light source control signal includes a first duty cycle signal and a second duty cycle signal; the output sub-pixel control signal includes a red transmittance signal, a blue transmittance signal, and a green transmittance signal; The working process of the dual-color light source includes alternating execution of a first moment and a second moment; the steps of outputting a light source control signal to the blue light source and the green light source, wherein the blue light source emits red-blue mixed light according to the light source control signal, and the green light source emits green light according to the light source control signal, include: At the first moment, the first duty cycle signal is input to the blue light source to drive the blue light source to emit blue light, and the green light source stops working; The blue light passes through the red phosphor and excites the red phosphor to emit red light. The red light and the blue light are mixed to obtain red-blue mixed light. At the second moment, the second duty cycle signal is input to the green light source, and the blue light source stops working.

[0012] In a further embodiment of the present invention, the output sub-pixel control signal is sent to the liquid crystal layer, and the color sub-pixel includes a blue sub-pixel, a red sub-pixel, and a green sub-pixel; the step of the color sub-pixel adjusting the transmittance of the corresponding color sub-pixel according to the sub-pixel control signal, filtering stray light from the red-blue mixed light and the green light, and transmitting pure red light, pure green light, and pure blue light includes: At the first moment, a blue transmittance signal is output to the blue sub-pixel based on the image frame to be displayed, and a red transmittance signal is output to the red sub-pixel; At the first moment, the blue sub-pixel and the red sub-pixel are controlled to adjust the liquid crystal transmittance according to the blue transmittance signal and the red transmittance signal, respectively; the red-blue mixed light passes through the blue sub-pixel to output pure blue light, and the red-blue mixed light passes through the red sub-pixel to output pure red light; At the second moment, a green transmittance signal is output to the green sub-pixel based on the image frame to be displayed; At the second moment, the green sub-pixel is controlled to adjust the liquid crystal transmittance according to the green transmittance signal, and the green light passes through the green sub-pixel to output pure green light.

[0013] In a further embodiment of the present invention, the blue light source includes at least one blue light chip, and the green light source includes at least one green light chip; the dual-color light source includes a bracket and a green light chip and at least one blue light chip disposed in the bracket, or includes a bracket and a blue light chip and at least one green light chip disposed in the bracket; wherein the blue light chip and the green light chip are alternately disposed.

[0014] Based on the same inventive concept, the present invention also provides a display device applied to the dual-color light source liquid crystal display backlight control method as described above, comprising: a dual-color light source backlight liquid crystal panel and a control circuit, wherein the dual-color light source backlight liquid crystal panel includes a liquid crystal layer and a plurality of dual-color light sources arranged in an array, wherein the dual-color light sources include a blue light source and a green light source, and a red phosphor paste is filled above the blue light source; the first control terminal and the second control terminal of the control circuit are respectively connected to the liquid crystal layer and the dual-color light source.

[0015] In a further embodiment of the present invention, the blue light source includes at least one blue light chip, and the green light source includes at least one green light chip; the dual-color light source includes a bracket and a green light chip and at least one blue light chip disposed in the bracket, or includes a bracket and a blue light chip and at least one green light chip disposed in the bracket; wherein the blue light chip and the green light chip are alternately disposed.

[0016] This invention provides a method and device for controlling the backlight of a dual-color light source liquid crystal display. The method controls a dual-color light source backlight liquid crystal panel, which includes a liquid crystal layer and several arrayed dual-color light sources. Each dual-color light source includes a blue light source and a green light source, with red phosphor paste filling the space above the blue light source. The liquid crystal layer is disposed above the arrayed dual-color light sources and has several color sub-pixels for transmitting specific colors. The steps include: acquiring an image frame to be displayed, obtaining RGB grayscale data of the image frame; obtaining a sub-pixel control signal and a light source control signal corresponding to the dual-color light source at the current moment based on the RGB grayscale data; outputting the light source control signal to the blue and green light sources of the dual-color light source, and outputting the sub-pixel control signal to the liquid crystal layer, wherein the sub-pixel control signal drives the liquid crystal layer to output pure three-color light. This invention achieves pure tri-color light output by exciting red phosphor paste with a dual-color light source. Since red and blue light do not have overlapping transmission spectra, the penetration path of non-target color light is fundamentally eliminated, reducing color shift and improving the color reproduction accuracy of the entire screen. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a flowchart of the steps in the dual-color light source liquid crystal display backlight control method of the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of the dual-color light source backlight liquid crystal panel of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of a dual-color light source in a preferred embodiment of the present invention.

[0021] Figure 4 (a) and Figure 4 (b) is a schematic diagram of the structure of the dual-color light source in another preferred embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram showing the connection relationship between the dual-color backlight LCD panel and the control circuit in the first preferred embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram showing the connection relationship between the dual-color backlight LCD panel and the control circuit in the second preferred embodiment of the present invention.

[0024] Figure 7 This is a timing diagram of control signals in the third preferred embodiment of the present invention.

[0025] The markings in the attached diagram are as follows: 100, dual-color light source; 101, bracket; 102, blue light source; 103, green light source; 104, red phosphor adhesive; 201, first power module; 202, second power module; 203, microcontroller module; 204, liquid crystal layer; 2041, red subpixel; 2042, blue subpixel; 2043, green subpixel; 300, partition; 301, main chip; 302, microcontroller chip; 303, channel control chip. Detailed Implementation

[0026] This invention provides a method and device for controlling the backlight of a dual-color light source liquid crystal display. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0027] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of the present invention involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0028] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0029] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0030] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0031] Liquid crystal displays (LCDs) typically consist of a liquid crystal layer and a backlight module. Within the liquid crystal layer, the red, green, and blue sub-pixel windows allow a wide range of light wavelengths to pass through, with overlapping regions between their transmission spectra. When using traditional white LED (Light Emitting Diode) backlighting, the blue sub-pixel windows transmit blue backlight light, but a small amount of green light also seeps out; the green sub-pixel windows transmit green light, but a small amount of blue and red light also seeps out. This cross-pixel penetration of non-target color light causes color mixing distortion in the displayed image, leading to color shift defects, reduced color purity, decreased color gamut coverage, and ultimately affecting the color performance capabilities of the LCD.

[0032] The inventors discovered that existing technologies offer several solutions to address the aforementioned problems. One example is using red, green, and blue LEDs as a backlight source, such as on a backlight substrate with zoned control. However, this solution requires independent driving circuits for each of the three colors, resulting in a large number of LEDs, complex structure, and high cost. Another solution uses blue LEDs to excite phosphors to produce white light, but this still suffers from sub-pixel color bleeding.

[0033] Therefore, a backlighting scheme and its control method are needed that can effectively suppress color crosstalk between sub-pixels while controlling costs.

[0034] To address the technical problems existing in the prior art, this invention discloses a dual-color light source 100 liquid crystal display backlight control method, which is used to control a dual-color light source backlit liquid crystal panel. For ease of understanding, the display device applied to the dual-color light source 100 liquid crystal display backlight control method described above will be explained, such as... Figure 2 and Figure 3As shown, the display device includes a dual-color backlight liquid crystal panel and a control circuit. The dual-color backlight liquid crystal panel includes a liquid crystal layer 204 and a plurality of arrayed dual-color light sources 100. The liquid crystal layer 204 is disposed above the arrayed dual-color light sources 100 to form a backlight structure. A plurality of color sub-pixels are disposed on the liquid crystal layer 204. That is, each physical pixel on the screen is composed of sub-pixels of three colors (RGB) for transmitting a specific color. The first control terminal and the second control terminal of the control circuit are respectively connected to the liquid crystal layer 204 and the dual-color light sources 100 to control the operation of the liquid crystal layer 204 and the dual-color light sources 100. The dual-color light source 100 includes a blue light source 102 and a green light source 103. In some preferred embodiments, the dual-color light source 100 uses a semiconductor dual-color LED light source, including a bracket 101 and a blue light source 102 and a green light source 103 disposed in the bracket 101. The blue light source 102 and the green light source 103 are disposed in the cup-shaped opening of the same bracket 101, and at least the blue light source 102 is filled with red phosphor adhesive 104. That is, the red phosphor adhesive 104 can be filled only above the blue light source 102, or the red phosphor adhesive 104 can be disposed above both the blue light source 102 and the green light source 103. Specifically, the red phosphor adhesive 104 can be coated using any one of the following methods: free dispensing, conformal coating, and distance coating. The blue light source 102 emits blue light and excites the red phosphor 104 to produce red light, resulting in the light source emitting violet light containing both blue and red light. The green light source 103 emits green light and does not excite the red phosphor 104, resulting in the light source emitting pure green light. Therefore, only the working control circuits for the blue light source 102 and the green light source 103 are needed to control the working state of the dual-color backlight LCD panel, simplifying the circuitry. Optionally, the blue light source 102 and the green light source 103 are encapsulated in the cup-shaped opening of the bracket 101 using red phosphor 104; the blue light source 102 and the green light source 103 each include a blue light chip and a green light chip, respectively, and the blue light chip and the green light chip are gallium nitride-based chips.

[0035] Specifically, such as Figure 1 As shown, the steps of the dual-color light source 100 liquid crystal display backlight control method include: S100: Obtain the image frame to be displayed and get the RGB grayscale data of the image frame to be displayed; In this digital screen display, the colors are perceived by the human eye when light emitted from a light source directly illuminates the image. Therefore, by decomposing the image frame to be displayed into RGB light rays at each pixel and mixing them, a complete image display of the image frame can be achieved. Specifically, the control circuit includes at least a microcontroller module 203 capable of image data processing and calculation. The microcontroller module 203 is used to acquire the RGB grayscale data of the image frame to be displayed, where the RGB grayscale data consists of the grayscale values ​​of the red (R), green (G), and blue (B) components.

[0036] S200: Obtain the sub-pixel control signal and light source control signal corresponding to the current output dual-color light source 100 based on the RGB grayscale data; After parsing the grayscale data of the red, green, and blue components from the RGB grayscale data of the image frame to be displayed, the RGB grayscale data is converted into driving signals for the blue light source 102 and the green light source 103 at the current pixel position. This determines the luminous intensity of the blue light source 102 and the green light source 103, which in turn determines the brightness of the subsequent red-blue mixed backlight and the brightness of the pure green backlight. At the same time, control signals are generated based on the RGB grayscale data to control the color sub-pixels at the corresponding positions on the liquid crystal layer 204, thereby controlling the switching state and transmittance of several color sub-pixels on the liquid crystal panel.

[0037] The backlight used by the red sub-pixel 2041 and the blue sub-pixel 2042 is provided by the blue light source 102 of the dual-color light source 100. The light emitted by the blue light source 102 simultaneously determines the intensity of the blue and red light emitted on the dual-color backlight liquid crystal panel. Therefore, in actual operation, the sub-pixel control signal and the light source control signal are calculated based on the gray values ​​of the red (R) and blue (B) components. The sub-pixel control signal is used to control the transmittance of the sub-pixels on the liquid crystal layer 204, and the light source control signal is used to control the output light intensity of the blue light source 102 and the green light source 103 respectively, thereby controlling the brightness of the backlight output light.

[0038] S300, output the light source control signal to the blue light source 102 and green light source 103 of the dual-color light source 100, and output the sub-pixel control signal to the liquid crystal layer 204. The sub-pixel control signal drives the liquid crystal layer 204 to output pure tri-color light.

[0039] Specifically, the sub-pixels on the liquid crystal layer 204 are composed of liquid crystal switches and color filters. When the electrodes in the panel are energized, the liquid crystal molecules in the liquid crystal layer 204 twist, allowing light from the backlight module to pass through and emit light. By controlling the degree of twisting of the liquid crystal molecules on the liquid crystal layer 204, the transmittance of the transmitted light can be controlled. The color filter is used to select light within a predetermined frequency range and filter out stray light from other frequency ranges.

[0040] In a preferred embodiment of the present invention, the step of outputting the light source control signal to the blue light source 102 and the green light source 103 of the dual-color light source 100, and outputting the sub-pixel control signal to the liquid crystal layer 204, wherein the sub-pixel control signal drives the liquid crystal layer 204 to output pure tri-color light includes: S310, Output a light source control signal to the blue light source 102 and the green light source 103. The blue light source 102 emits red-blue mixed light according to the light source control signal, and the green light source 103 emits green light according to the light source control signal. S320, output sub-pixel control signal to the liquid crystal layer 204, the color sub-pixel includes blue sub-pixel 2042, red sub-pixel 2041 and green sub-pixel 2043; the color sub-pixel is used to adjust the transmittance of the corresponding color sub-pixel according to the sub-pixel control signal, filter stray light from the red-blue mixed light and the green light and transmit pure red light, pure green light and pure blue light.

[0041] In this embodiment, the backlight used by the red sub-pixel 2041 and the blue sub-pixel 2042 is provided by the blue light source 102 of the dual-color light source 100. The light emitted by the blue light source 102 simultaneously determines the intensity of the blue and red light emitted from the dual-color backlight liquid crystal panel. Therefore, in actual operation, the sub-pixel control signal and the light source control signal for controlling the blue light source 102 are calculated based on the grayscale values ​​of the red (R) and blue (B) components, and the sub-pixel control signal and the light source control signal for controlling the green light source 103 are calculated based on the grayscale values ​​of the green (G) component. The sub-pixel control signal is used to control the transmittance of the sub-pixels on the liquid crystal layer 204, and the light source control signal is used to control the output light intensity of the blue light source 102 and the green light source 103 respectively, thereby controlling the brightness of the backlight output light.

[0042] The blue light source 102 and green light source 103 in the dual-color light source 100 receive the light source control signal output by the microcontroller module 203 of the control circuit and control their own working state. The green sub-pixel 2043, red sub-pixel 2041, and blue sub-pixel 2042 are arranged in a uniform distribution and in an array matrix. It should be noted that, optionally, the state control process of the liquid crystal layer 204 in step 320 and the control of the dual-color light source 100 in step S310 are executed simultaneously in time. That is, when the blue light source 102 emits red and blue mixed light, the blue sub-pixel 2042 and red sub-pixel 2041 adjust their own liquid crystal structure transmittance accordingly; when the green light source 103 emits green light, the green sub-pixel 2043 adjusts its own liquid crystal structure accordingly. Since the output red-blue mixed light and green light may contain impurities, the excited red-blue mixed light and green light pass through the red sub-pixel 2041, blue sub-pixel 2042, and green sub-pixel 2043 in the upper liquid crystal layer 204 to achieve light transmission within a specific frequency range. That is, the red sub-pixel 2041 can only transmit red light, and the blue sub-pixel 2042 can only transmit blue light. For the blue and / or red grayscale information in the image frame to be displayed, the first duty cycle signal drives the blue light source 102 to emit light. The emitted blue light excites the phosphor to produce red light, thereby providing a purple backlight (red-blue mixed light) containing both blue and red light, and controlling the corresponding blue sub-pixel 2042 and / or red sub-pixel 2041 in the liquid crystal layer 204 to turn on. Utilizing the characteristic that the transmission frequencies of the blue sub-pixel 2042 and red sub-pixel 2041 do not overlap, the blue sub-pixel 2042 transmits only blue light, and the red sub-pixel 2041 transmits only red light, thus presenting pure blue and red backlights. Similarly, for the green grayscale information in the image frame to be displayed, the second duty cycle signal drives the green light source 103 to emit light, providing pure green backlight. In conjunction with the green sub-pixels 2043 of the liquid crystal layer 204 transmitting green light, it provides pure green backlight without any other color penetration.

[0043] In some preferred embodiments, the blue light source 102 includes at least one blue light chip, and the green light source 103 includes at least one green light chip. The dual-color light source 100 also includes a bracket for supporting the blue light source 102 and the green light source 103. That is, in some preferred embodiments, the dual-color light source 100 includes a bracket 101, a single green light chip, and multiple blue light chips, such as... Figure 4 As shown in (a), or, a blue light chip and multiple green light chips, as... Figure 4As shown in (b), the blue light source 102 and the green light source 103 are alternately arranged inside the cup-shaped opening of the bracket 101, and are connected to an externally input light source control signal through the internal wiring of the bracket 101. The blue light source 102 is connected to a light source control signal for controlling red and blue light, and the green light source 103 is connected to a light source control signal for controlling green light. To simplify the control circuit, in embodiments where multiple blue light chips are arranged in the blue light source 102 or multiple green light chips are arranged in the green light source 103, the same light source control signal can be connected between multiple blue light chips or multiple green light chips. In a dual-color light source 100, the light source control signal received by chips of the same color is consistent. Furthermore, when there are multiple blue light chips or multiple green light chips, the blue light chips and green light chips are alternately arranged to make the chips of the same color symmetrically distributed, which is beneficial to the uniform and symmetrical emission pattern of the light source.

[0044] Furthermore, depending on the different connection relationships between the dual-color light source 100 and the control circuit, the backlight control method for the dual-color light source 100 liquid crystal display will also change accordingly.

[0045] In the first preferred embodiment, such as Figure 5 As shown, a first duty cycle signal is obtained by comprehensively calculating the gray levels on the red and blue components, and sent to the first power module 201 to control the current of the blue light source 102, thereby adjusting the intensity of the purple backlight. The G gray level is converted into a second duty cycle signal and sent to the second power module 202 to control the current of the green light source 103, thereby adjusting the intensity of the green backlight. The liquid crystal layer 204 synchronously drives the transmittance of each sub-pixel according to the video data, cooperating with the backlight to present the image. This method has a simple structure and is suitable for cost-sensitive non-zoned 300 backlight display devices.

[0046] The light source control signals include a first duty cycle signal and a second duty cycle signal. All blue light sources 102 in the global dimming system are connected in series and parallel to the first power module 201, and all green light sources 103 are connected in series and parallel to the second power module 202. The video signal is input to the microcontroller module 203, which extracts the RGB grayscale data of each pixel. The blue light sources 102 of the arrayed dual-color light sources 100 are interconnected and connected to the first duty cycle signal; the green light sources 103 of the arrayed dual-color light sources 100 are interconnected and connected to the second duty cycle signal. The output sub-pixel control signals include red transmittance signals, blue transmittance signals, and green transmittance signals.

[0047] Correspondingly, the step of outputting the light source control signal to the blue light source 102 and the green light source 103, wherein the blue light source 102 emits red-blue mixed light according to the light source control signal, and the green light source 103 emits green light according to the light source control signal includes: S311a. Extract the red and blue grayscale data from the RGB grayscale data, and calculate the first duty cycle signal based on the red and blue grayscale data. S312a. Extract the green grayscale data from the RGB grayscale data, and calculate the second duty cycle signal based on the green grayscale data; S313a. Control the global operating brightness of the blue light source 102 and the green light source 103 of the plurality of arrayed dual-color light sources 100 according to the first duty cycle signal and the second duty cycle signal respectively.

[0048] In this configuration, all blue light sources 102 are connected in series and parallel to form one overall channel, and all green light sources 103 are connected in series and parallel to form another overall channel, each powered by a separate power supply module. Optionally, the microcontroller module 203 includes a display main chip 301 or an image quality chip to detect the RGB grayscale information of the video image and obtain the RGB grayscale data of the image frame to be displayed. The red and blue grayscale data in the RGB grayscale data are converted into a PWM (Pulse-Width Modulation) control signal to obtain a first duty cycle signal. This signal is sent to the first power supply module 201 to control the current of the blue light source 102 and adjust the intensity of the purple backlight. Correspondingly, the green grayscale data is converted into another PWM control signal to obtain a second duty cycle signal, which is sent to the second power supply module 202 to control the current of the green light source 103 and adjust the intensity of the green backlight. By real-time adjustment of the two PWM currents, the backlight brightness and color of the arrayed dual-color light sources 100 are globally adjusted.

[0049] Specifically, before the step of extracting the red and blue grayscale data from the RGB grayscale data and calculating the first duty cycle signal based on the red and blue grayscale data, the method further includes: M100: Acquire red, blue, and green grayscale data from RGB grayscale data and perform preprocessing. After receiving the video signal, the microcontroller module 203 extracts the RGB grayscale data (usually 8-bit or 10-bit) of all pixels in the current frame.

[0050] Calculate the global color feature parameters of the current frame to obtain the global mean red value. have:

[0051] Global blue mean have:

[0052] Global green mean have:

[0053] Where N is the total number of pixels in the current frame, R i G i B i Let i be the grayscale value of pixel i (0~255 or 0~1023), and then calculate the global mean of the image frame to be displayed in the red, green and blue components respectively.

[0054] Further, step S311a is executed to extract the red and blue grayscale data from the RGB grayscale data, and to calculate the first duty cycle signal based on the red and blue grayscale data.

[0055] Specifically, the red and blue grayscale data can be defined as the global red mean. and global blue mean The first power module 201 controls the blue light source 102 to excite the red phosphor 104 to generate red-blue mixed light according to the first duty cycle signal. The first duty cycle D M The duty cycle of the first duty cycle signal is determined by the global red mean. and global blue mean Joint decision.

[0056] The first duty cycle D M Various methods can be used for calculation. Optionally, this invention illustrates a method of calculating the first duty cycle signal based on color feature parameters, especially the global mean of the three color components.

[0057] Option 1: Linear weighted model for the first duty cycle D M ,have: ; Among them, R max B max These are the maximum grayscale values ​​for the red and blue components (255 for 8-bit and 1023 for 10-bit), used for normalization. α and β are the red and blue contribution weights, respectively, satisfying α + β = 1. The result is then limited to [D] by applying a clamping function. min D max Within the range, optionally, [D] min D max The range is typically 0 to 1 or 0% to 100%.

[0058] For example, if the focus is on brightness uniformity, the red contribution weight α = 0.5 and the blue contribution weight β = 0.5 can be chosen. If the user's eye is more sensitive to red, the red contribution weight α = 0.6 and the blue contribution weight β = 0.4 can be appropriately increased, thereby improving the brightness of the red backlight and enhancing the vividness of the red parts of the image. It can be seen that when the red component of the image increases, the global red average value... Increase the first duty cycle D M Increase. Similarly, as the blue component of the image increases, the global blue mean also increases. Increase, first duty cycle D M The red average value increases when the image is dark. and global blue mean Both are relatively small, the first duty cycle D M decline.

[0059] Option 2: Nonlinear Model Considering that the human eye is more sensitive to low grayscale changes, the grayscale values ​​can be nonlinearly mapped before weighting. For the first duty cycle D... M ,have: ; Wherein, γRγB are the gamma values ​​of the red and blue components, typically ranging from 1.8 to 2.4.

[0060] When the global red average Or global blue mean Approaching 255, the image is in a high grayscale region. The duty cycle signal changes smoothly to avoid overexposure. When the global red average... Or global blue mean When the value is close to 0, the image is in a low grayscale area, and the duty cycle signal changes sharply to ensure details in the shadows.

[0061] Option 3: Maximum Value Dominant Model. When the image is dominated by pure red or pure blue, to avoid diluting the monochromatic brightness with weights, the maximum value dominant model can be adopted. In this case, the first duty cycle D is... M ,have: ; Among them, the backlight intensity is determined solely by the global red average. and global blue mean The larger of the two values ​​determines whether the pure red or pure blue image receives sufficient backlight support.

[0062] The first duty cycle D can be obtained using any of the methods described above. M Alternatively, the first duty cycle D can be calculated using other existing duty cycle signal calculation methods. M Therefore, based on the first duty cycle D M The first duty cycle signal can be confirmed.

[0063] Further, step S312a is executed to extract the green grayscale data from the RGB grayscale data, and to calculate the second duty cycle signal based on the green grayscale data.

[0064] The second power module 202 controls the green light source 103 according to the second duty cycle signal, wherein the second duty cycle D G The duty cycle of the second duty cycle signal is determined solely by the global green mean. Independently decide on the second duty cycle D G ,have: ; Among them, G max γG represents the maximum grayscale value, and γG is the gamma value of the green channel, typically set to 2.2. Specifically, as the green component of the image increases, the global green mean value... Increase, second duty cycle D G As the current increases, the current in green light source 103 increases, enhancing the green backlight. When there is no green content in the image, the global green average value... Approaching 0, second duty cycle D G The brightness is reduced to a minimum, at which point the green backlight is turned off or reduced to extremely low brightness to reduce power consumption and prevent light leakage. This is then adjusted according to the second duty cycle D. G The second duty cycle signal is obtained.

[0065] Based on this, the step of controlling the global operating brightness of the blue light source 102 and the green light source 103 of the plurality of arrayed dual-color light sources 100 according to the first duty cycle signal and the second duty cycle signal respectively includes: S3131a. Acquire the first duty cycle signal and output the red and blue working control current to the blue light source 102 of the array of dual-color light sources 100 according to the first duty cycle signal. S3132a. Acquire the second duty cycle signal and output the green light working control current to the green light source 103 of the plurality of arrayed dual-color light sources 100 according to the second duty cycle signal. S3133a: The global working brightness of the blue light source 102 of the plurality of arrayed dual-color light sources 100 is controlled by the red and blue working control current; the global working brightness of the green light source 103 of the plurality of arrayed dual-color light sources 100 is controlled by the green light working control current.

[0066] The control circuit includes a microcontroller module 203 for implementing software program control, a first power supply module 201, and a second power supply module 202. The first power supply module 201 has its input connected to a first duty cycle signal output from the microcontroller module 203, and its output connected to the blue light source 102 of the arrayed dual-color light sources 100, for outputting a red-blue operating control current to the blue light source 102 according to the first duty cycle signal. The second power supply module 202 has its input connected to a second duty cycle signal output from the microcontroller module 203, and its output connected to the green light source 103 of the arrayed dual-color light sources 100, for outputting a green light operating control current to the green light source 103 according to the second duty cycle signal. Specifically, inputting the first duty cycle signal to the first power supply module 201 controls it to output a red-blue operating control current to the blue light source 102 of the arrayed dual-color light sources 100. A second duty cycle signal is input to the second power module 202, controlling the second power module 202 to output a green light operating control current to the green light source 103 of the plurality of arrayed dual-color light sources 100. The global operating brightness of the blue light source 102 of the plurality of arrayed dual-color light sources 100 is controlled by the red-blue operating control current; the global operating brightness of the green light source 103 of the plurality of arrayed dual-color light sources 100 is controlled by the green light operating control current.

[0067] The microcontroller module 203 will calculate the first duty cycle D. M Second duty cycle D G The signals are sent to the first power module 201 and the second power module 202 respectively, which adjust the red-blue working control current and the green light working control current, thereby controlling the actual light output intensity of the purple backlight and the green backlight. Specifically, when the red component of the image increases, the global average red value... Increase, first duty cycle D M The current increases accordingly. Consequently, the current in the blue light source 102 increases, and both red and blue light in the purple backlight are enhanced simultaneously. Similarly, when the blue component of the image increases, the global blue average value increases. Increase, first duty cycle D M As the current increases, the current output to the blue light source 102 increases, enhancing the purple backlight. When the image is dark, the red component and the global blue average value of the image... Both are relatively small, the first duty cycle D M As the power consumption decreases, the purple backlight weakens, resulting in reduced brightness.

[0068] Subsequently, the liquid crystal layer 204 synchronously performs control over the sub-pixels. The liquid crystal layer 204 controls the transmittance T of the red sub-pixel 2041 according to the original video data. R (i, j), transmittance T of green subpixel 2043 G (i, j) and the transmittance T of the blue subpixel 2042 B (i, j), where (i, j) are the coordinates of the pixel within the entire image frame to be displayed. The final display brightness is the product of the backlight intensity and the liquid crystal transmittance. Therefore, the red light component transmitted through the purple backlight by the red sub-pixel 2041 is: ; The blue light component transmitted through the purple backlight to the blue sub-pixel 2042 includes: ; The green light component transmitted through the green backlight to the green sub-pixel 2043 includes: ; Among them, L M，blue L is the luminance coefficient of the red-blue mixed light under full current. G，green The required red, blue, and green light components are predetermined to determine the green light luminance coefficient under full current. Therefore, the transmittance T of the target red sub-pixel 2041 can be derived in reverse. R (i, j), transmittance T of green subpixel 2043 G (i, j) and the transmittance T of the blue subpixel 2042 B (i, j), and through the red subpixel 2041 transmittance T R (i, j), transmittance T of green subpixel 2043 G (i, j) and the transmittance T of the blue subpixel 2042 B (i, j) obtains the red transmittance signal for controlling the red sub-pixel 2041, the green transmittance signal for controlling the green sub-pixel 2043, and the blue transmittance signal for controlling the blue sub-pixel 2042, thereby controlling the transmittance of the three primary color sub-pixels.

[0069] It should be noted that the working mode and calculation mode of the liquid crystal layer 204 can be simultaneously applied to the second preferred embodiment, the third preferred embodiment, or other existing embodiments, and will not be repeated below.

[0070] In the second preferred embodiment, such as Figure 6 As shown, the dual-color backlight LCD panel is divided into several partitions 300, and each partition 300 includes a dual-color light source 100; the light source control signal includes a first duty cycle signal and a second duty cycle signal; the output sub-pixel control signal includes a red transmittance signal, a blue transmittance signal and a green transmittance signal.

[0071] Correspondingly, the step of outputting the light source control signal to the blue light source 102 and the green light source 103, wherein the blue light source 102 emits red-blue mixed light according to the light source control signal, and the green light source 103 emits green light according to the light source control signal includes: S311b: Divide the RGB grayscale data according to the plurality of partitions 300, and find the RGB grayscale data of the region of the dual-color light source 100 in the corresponding partition 300. S312b: Extract the red and blue grayscale data from the RGB grayscale data of the region, and calculate the current of the blue light source 102 based on the red and blue grayscale data. S313b: Extract the green grayscale data from the RGB grayscale data of the region, and calculate the current of the green light source 103 based on the green grayscale data; S314b: Control the working brightness of partition 300 of blue light source 102 and green light source 103 according to the current of blue light source 102 and green light source 103 respectively.

[0072] Specifically, the backlight area on the dual-color backlight LCD panel is divided into multiple partitions 300, each partition 300 containing a set of dual-color light sources 100. In this embodiment, the microcontroller module 203 includes at least a display main chip 301, a microcontroller chip 302, and several channel control chips 303. The main chip 301 is connected to the microcontroller chip 302, and optionally, it can use an SPI bus or any existing transmission bus for transmission. After extracting RGB grayscale information, the main chip 301 sends the target brightness and color data of each partition 300 to the microcontroller chip 302 via the SPI bus. The microcontroller chip 302 converts digital instructions into multi-channel analog control signals, which are connected to the channel control chips 303 of each partition 300. The channel control chips 303 independently adjust the driving current of the blue light source 102 and the green light source 103 in each partition 300. Simultaneously, the main chip 301 outputs light source control signals to synchronize the operation of each sub-pixel of the liquid crystal layer 204. This method can achieve high dynamic contrast and precise local color control, making it suitable for mid-to-high-end displays. It should be noted that the first duty cycle signal of the blue light source 102 and the second duty cycle signal of the green light source 103 in this embodiment can also be implemented using the above calculation scheme, and the calculation is performed using the red grayscale data, blue grayscale data, and green grayscale data of pixel i in the three components as input.

[0073] In a third preferred embodiment, the light source control signal includes a first duty cycle signal and a second duty cycle signal; the output sub-pixel control signal includes a red transmittance signal, a blue transmittance signal, and a green transmittance signal; the working process of the dual-color light source 100 includes alternating execution of a first time point T1 and a second time point T2; The step of sending the output light source control signal to the blue light source 102 and the green light source 103, wherein the blue light source 102 emits red-blue mixed light according to the light source control signal, and the green light source 103 emits green light according to the light source control signal includes: S311c, At the first moment T1, the first duty cycle signal is input to the blue light source 102 to drive the blue light source 102 to emit blue light, and the green light source 103 stops working. S312c, The blue light passes through the red phosphor 104 and excites the red phosphor 104 to emit red light, and the red light and the blue light are mixed to obtain red-blue mixed light; S313c, at the second time T2, the second duty cycle signal is input to the green light source 103, and the blue light source 102 stops working.

[0074] Specifically, this scheme employs a time-division color mixing control strategy, dividing the display time of one frame into alternating time intervals T1 and T2. Optionally, the durations of the first time interval T1 and the second time interval T2 are equal, such as... Figure 7 As shown, at the first time T1, the system inputs a high-level first duty cycle signal to the blue light source 102, driving the blue light source 102 to emit blue light. At this time, the second duty cycle signal is low, and the green light source 103 stops working. When the blue light passes through the red phosphor adhesive 104 encapsulated in the cup mouth of the same bracket 101, part of the blue light excites the red phosphor adhesive 104 to produce red light. The red light mixes with the remaining transmitted blue light to form red-blue mixed light, providing purple backlight for the liquid crystal layer 204. At the same time, in conjunction with the high-level red and blue transmittance signals of the sub-pixel control signal, the corresponding red sub-pixel 2041 and blue sub-pixel 2042 are turned on, completing the display of the red and blue components of this frame. At the second time T2, the system inputs a high-level second duty cycle signal to the green light source 103, driving the green light source 103 to emit pure green light. At this time, the first duty cycle signal is low, the blue light source 102 stops working, and the green transmittance signal is high, controlling the green sub-pixel 2043 to be turned on synchronously to display the green component. By rapidly switching between two time points, the persistence of vision in the human eye is utilized to achieve full-color display of a single frame. It should be noted that the high and low signal levels in this invention are only used to indicate the working state of the dual-color light source 100 or each color sub-pixel. Furthermore, the signal duty cycle can be synchronously adjusted to regulate the brightness of the dual-color light source 100 and the transmittance of the sub-pixels, which will not be elaborated upon here. This method utilizes only the overall backlight color switching and synchronized liquid crystal operation to fundamentally eliminate color penetration between sub-pixels and achieve high-purity color reproduction without the need for complex partitioning circuitry (300 circuits).

[0075] It should be noted that the solution of the third preferred embodiment can be implemented simultaneously with the first preferred embodiment or the second preferred embodiment, that is, based on the global dimming and zone 300 dimming, synchronous control or time-sharing control can be achieved.

[0076] In a further embodiment of the present invention, the output sub-pixel control signal is sent to the liquid crystal layer 204, and the color sub-pixel includes a blue sub-pixel 2042, a red sub-pixel 2041, and a green sub-pixel 2043; the step of the color sub-pixel adjusting the transmittance of the corresponding color sub-pixel according to the sub-pixel control signal, filtering stray light from the red-blue mixed light and the green light, and transmitting pure red light, pure green light, and pure blue light includes: S321c, At the first moment T1, a blue transmittance signal is output to the blue sub-pixel 2042 and a red transmittance signal is output to the red sub-pixel 2041 according to the image frame to be displayed; S322c, at the first moment T1, the blue sub-pixel 2042 and the red sub-pixel 2041 are controlled to adjust the liquid crystal transmittance according to the blue transmittance signal and the red transmittance signal respectively; the red and blue mixed light passes through the blue sub-pixel 2042 to output pure blue light, and the red and blue mixed light passes through the red sub-pixel 2041 to output pure red light; S323c, at the second time T2, outputs a green transmittance signal to the green sub-pixel 2043 according to the image frame to be displayed; S324c, at the second time T2, the green sub-pixel 2043 is controlled to adjust the liquid crystal transmittance according to the green transmittance signal, and the green light passes through the green sub-pixel 2043 to output pure green light.

[0077] In this invention, sub-pixel driving control for red-blue mixed light and green light is executed at the first time T1 and the second time T2, respectively, to achieve precise synchronization with the backlight side emission timing. Specifically, at the first time T1, based on the red and blue components of the image frame to be displayed, a red transmittance signal is output to the red sub-pixel 2041 and a blue transmittance signal is output to the blue sub-pixel 2042, respectively. The red sub-pixel 2041 and the blue sub-pixel 2042 are controlled to adjust the liquid crystal deflection state according to their respective transmittance signals. At this time, the green sub-pixel 2043 is in the off state. After the red-blue mixed light generated by the red phosphor 104 excited by the blue light source 102 irradiates the liquid crystal layer 204, the physical characteristic that the transmission spectra of the blue sub-pixel 2042 and the red sub-pixel 2041 do not overlap is utilized, so that the blue light component in the red-blue mixed light can only pass through the blue sub-pixel 2042 and the red light component can only pass through the red sub-pixel 2041, thereby outputting pure blue light and pure red light respectively, completing the display of the red and blue components on the image frame to be displayed. At the second time T2, the system outputs a green transmittance signal to the green sub-pixel 2043 based on the green component of the image frame to be displayed. The system then controls the green sub-pixel 2043 to adjust the liquid crystal transmittance according to this signal. At this time, the red sub-pixel 2041 and blue sub-pixel 2042 are turned off. The pure green light emitted by the green light source 103 is emitted through the green sub-pixel 2043, completing the display of the green component of that frame. Through the alternating switching between the first time T1 and the second time T2, the backlight emission and the switching and transmittance adjustment of each sub-pixel on the liquid crystal side are strictly synchronized. Combined with the persistence of vision effect of the human eye, this achieves the fusion presentation of a single frame of full-color image. It effectively avoids color penetration between sub-pixels without requiring a 300-degree partition circuit, ensuring the purity and accuracy of color reproduction.

[0078] This invention provides a method and device for controlling the backlight of a dual-color liquid crystal display, the advantages of which are: By using a blue light source to excite red phosphor paste in conjunction with a pure green light source, red, green, and blue three-primary-color backlighting is achieved. The green light is completely independent, and the spectra of blue sub-pixels and red sub-pixels do not overlap, eliminating color penetration between sub-pixels, significantly improving color purity and color gamut coverage, and making the image colors more accurate.

[0079] Both the blue and green light sources are gallium nitride systems, and are encapsulated together with red phosphors in a single-support cup. The light emission pattern is similar to that of a Lambertian lamp, ignoring color deviation, which is beneficial for secondary lens design. It can increase the ratio of LED spacing to light mixing height, reduce the number of LEDs used, and lower system costs.

[0080] Only two drive circuits are needed to control the blue and green light sources respectively, reducing the number of drive circuits by one-third compared to the traditional RGB three-color scheme, significantly reducing circuit cost and complexity.

[0081] The proposed global dimming, zoned light and color control, and time-division color mixing methods can flexibly adapt to display products with different performance requirements and cost constraints.

[0082] Pure tri-color light output is achieved by exciting red phosphor glue with a dual-color light source. Since there is no overlap in the transmission spectrum of red and blue light, the penetration path of non-target color light is fundamentally eliminated, reducing color shift and improving the color reproduction accuracy of the entire screen.

[0083] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A method for controlling the backlight of a dual-color light source liquid crystal display, characterized in that, This is used to control a dual-color backlight LCD panel, which includes a liquid crystal layer and several dual-color light sources arranged in an array. The dual-color light sources include a blue light source and a green light source, and the blue light source is filled with red phosphor paste. The liquid crystal layer is disposed above the plurality of arrayed dual-color light sources and is provided with a plurality of color sub-pixels; the steps include: Obtain the image frame to be displayed and get the RGB grayscale data of the image frame to be displayed; Based on the RGB grayscale data, the sub-pixel control signal and the light source control signal corresponding to the current output dual-color light source are obtained; The light source control signal is output to the blue and green light sources of the dual-color light source, and the sub-pixel control signal is output to the liquid crystal layer. The sub-pixel control signal drives the liquid crystal layer to output pure tri-color light.

2. The dual-color light source liquid crystal display backlight control method according to claim 1, characterized in that, The steps of outputting the light source control signal to the blue and green light sources of the dual-color light source, and outputting the sub-pixel control signal to the liquid crystal layer, wherein the sub-pixel control signal drives the liquid crystal layer to output pure tri-color light, include: Output light source control signals to the blue light source and the green light source. The blue light source emits red-blue mixed light according to the light source control signals, and the green light source emits green light according to the light source control signals. The sub-pixel control signal is output to the liquid crystal layer. The color sub-pixel includes a blue sub-pixel, a red sub-pixel, and a green sub-pixel. The color sub-pixel is used to adjust the transmittance of the corresponding color sub-pixel according to the sub-pixel control signal, filter stray light from the red-blue mixed light and the green light, and transmit pure red light, pure green light, and pure blue light.

3. The dual-color light source liquid crystal display backlight control method according to claim 2, characterized in that, The blue light sources of the arrayed dual-color light sources are interconnected and connected to a first duty cycle signal; the green light sources of the arrayed dual-color light sources are interconnected and connected to a second duty cycle signal; the light source control signal includes the first duty cycle signal and the second duty cycle signal; the output sub-pixel control signal includes a red transmittance signal, a blue transmittance signal, and a green transmittance signal. The step of sending the output light source control signal to the blue light source and the green light source, wherein the blue light source emits red-blue mixed light according to the light source control signal, and the green light source emits green light according to the light source control signal includes: Extract the red and blue grayscale data from the RGB grayscale data, and calculate the first duty cycle signal based on the red and blue grayscale data; Extract the green grayscale data from the RGB grayscale data, and calculate the second duty cycle signal based on the green grayscale data; The global operating brightness of the blue light source and the green light source of the arrayed dual-color light sources are controlled according to the first duty cycle signal and the second duty cycle signal, respectively.

4. The dual-color light source liquid crystal display backlight control method according to claim 3, characterized in that, The step of controlling the global operating brightness of the blue light source and the green light source of the plurality of arrayed dual-color light sources according to the first duty cycle signal and the second duty cycle signal respectively includes: Acquire the first duty cycle signal, and output the red and blue working control current to the blue light source of the array of dual-color light sources according to the first duty cycle signal; Acquire the second duty cycle signal, and output the green light working control current to the green light source of the array of dual-color light sources according to the second duty cycle signal; The global operating brightness of the blue light source of the arrayed dual-color light sources is controlled by the red-blue operating control current; the global operating brightness of the green light source of the arrayed dual-color light sources is controlled by the green light operating control current.

5. The dual-color light source liquid crystal display backlight control method according to claim 2, characterized in that, The dual-color backlight LCD panel is divided into several partitions, each partition including a dual-color light source; the light source control signal includes a first duty cycle signal and a second duty cycle signal; the output sub-pixel control signal includes a red transmittance signal, a blue transmittance signal, and a green transmittance signal; the step of outputting the light source control signal to the blue light source and the green light source, wherein the blue light source emits red-blue mixed light according to the light source control signal, and the green light source emits green light according to the light source control signal, includes: The RGB grayscale data is segmented according to the aforementioned partitions, and the RGB grayscale data of the dual-color light source region in the corresponding partition is found. Extract the red and blue grayscale data from the RGB grayscale data of the region, and calculate the blue light source current based on the red and blue grayscale data; Extract the green grayscale data from the RGB grayscale data of the region, and calculate the green light source current based on the green grayscale data; The working brightness of the blue light source and the green light source is controlled according to the current of the blue light source and the current of the green light source, respectively.

6. The dual-color light source liquid crystal display backlight control method according to claim 2, characterized in that, The light source control signal includes a first duty cycle signal and a second duty cycle signal; the output sub-pixel control signal includes a red transmittance signal, a blue transmittance signal, and a green transmittance signal; The working process of the dual-color light source includes alternating execution of a first moment and a second moment; the steps of outputting a light source control signal to the blue light source and the green light source, wherein the blue light source emits red-blue mixed light according to the light source control signal, and the green light source emits green light according to the light source control signal, include: At the first moment, the first duty cycle signal is input to the blue light source to drive the blue light source to emit blue light, and the green light source stops working; The blue light passes through the red phosphor and excites the red phosphor to emit red light. The red light and the blue light are mixed to obtain red-blue mixed light. At the second moment, the second duty cycle signal is input to the green light source, and the blue light source stops working.

7. The dual-color light source liquid crystal display backlight control method according to claim 6, characterized in that, The output sub-pixel control signal is sent to the liquid crystal layer, and the color sub-pixel includes a blue sub-pixel, a red sub-pixel, and a green sub-pixel; the color sub-pixel is used to adjust the transmittance of the corresponding color sub-pixel according to the sub-pixel control signal, and the step of filtering stray light from the red-blue mixed light and the green light and transmitting pure red light, pure green light, and pure blue light includes: At the first moment, a blue transmittance signal is output to the blue sub-pixel based on the image frame to be displayed, and a red transmittance signal is output to the red sub-pixel; At the first moment, the blue sub-pixel and the red sub-pixel are controlled to adjust the liquid crystal transmittance according to the blue transmittance signal and the red transmittance signal, respectively; the red-blue mixed light passes through the blue sub-pixel to output pure blue light, and the red-blue mixed light passes through the red sub-pixel to output pure red light; At the second moment, a green transmittance signal is output to the green sub-pixel based on the image frame to be displayed; At the second moment, the green sub-pixel is controlled to adjust the liquid crystal transmittance according to the green transmittance signal, and the green light passes through the green sub-pixel to output pure green light.

8. The dual-color light source liquid crystal display backlight control method according to claim 1, characterized in that, The blue light source includes at least one blue light chip, and the green light source includes at least one green light chip; the dual-color light source includes a bracket and a green light chip and at least one blue light chip disposed in the bracket, or includes a bracket and a blue light chip and at least one green light chip disposed in the bracket; wherein the blue light chip and the green light chip are alternately disposed.

9. A display device, characterized in that, The method for controlling the backlight of a dual-color light source liquid crystal display as described in any one of claims 1 to 8 includes: a dual-color light source backlight liquid crystal panel and a control circuit, wherein the dual-color light source backlight liquid crystal panel includes a liquid crystal layer and a plurality of dual-color light sources arranged in an array, wherein the dual-color light sources include a blue light source and a green light source, and a red phosphor paste is filled above the blue light source; a first control terminal and a second control terminal of the control circuit are respectively connected to the liquid crystal layer and the dual-color light source.

10. The display device according to claim 9, characterized in that, The blue light source includes at least one blue light chip, and the green light source includes at least one green light chip; the dual-color light source includes a bracket and a green light chip and a blue light chip disposed in the bracket.

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