Backlight driving method and related device

Abstract

This invention discloses a backlight driving method and related apparatus. For any backlight zone, the method determines the number of first sub-pixels of each color corresponding to the current backlight zone as a first quantity; the first sub-pixel is a sub-pixel that meets a first brightness requirement, which includes: the brightness of the sub-pixel is less than a first brightness threshold; the method determines the number of adjacent pixels in the first quantity corresponding to each color as a second quantity; when the second quantity corresponding to each color is greater than the first quantity threshold, the method controls LEDs of the same color in the current backlight zone to emit light at the same brightness, and at least some LEDs of different colors to emit light at different brightness. This enables the current backlight zone to emit colored light, solving the problem in the prior art where the current backlight zone emits weak white light or does not emit light, thus sacrificing the color gamut, thereby improving the color gamut and display effect.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a backlight driving method and related apparatus. Background Technology

[0002] Liquid crystal display (LCD) devices typically include a backlight panel and an LCD panel. The backlight panel provides backlighting for the LCD panel, enabling the display function. The backlight panel can include multiple backlight zones, each containing multiple light-emitting units. Each light-emitting unit can consist of mini LEDs (also known as LED beads) of three colors. This allows the backlight panel to achieve zone control, enabling different backlight zones to independently control their brightness and color. This significantly enhances the display contrast of the LCD device, presenting rich details in both bright and dark areas.

[0003] Therefore, how to control the LEDs of different colors in the backlight panel to improve the display effect has become an urgent problem to be solved in this field. Summary of the Invention

[0004] This invention provides a backlight driving method and related apparatus for controlling LEDs of various colors in a backlight panel to improve display performance.

[0005] In a first aspect, embodiments of the present invention provide a backlight driving method, which may include: when any backlight partition in a plurality of backlight partitions corresponds to a plurality of pixels, and each pixel includes a plurality of sub-pixels of different colors, and each backlight partition includes LEDs of multiple colors, and there are multiple LEDs of each color, for any backlight partition, the following process is performed: determining the number of first sub-pixels of each color corresponding to the current backlight partition as a first quantity; the first sub-pixel is a sub-pixel that meets a first brightness requirement, the first brightness requirement including: the brightness of the sub-pixel is less than a first brightness threshold; determining the number of adjacent pixels in the first quantity corresponding to each color as a second quantity; when the second quantity corresponding to each color is greater than the first quantity threshold, controlling LEDs of the same color in the current backlight partition to emit light at the same brightness, and at least some LEDs of different colors to emit light at different brightness.

[0006] In a second aspect, embodiments of the present invention provide a timing controller, comprising: a memory for storing program instructions; and a processor for calling the program instructions stored in the memory and executing the backlight driving method described in the first aspect and any embodiment thereof according to the obtained program.

[0007] Thirdly, embodiments of the present invention provide a system-on-a-chip, comprising: a memory for storing program instructions; and a processor for calling the program instructions stored in the memory and executing the backlight driving method as described in the first aspect and any embodiment thereof.

[0008] Fourthly, embodiments of the present invention provide a liquid crystal display device, comprising: a liquid crystal display panel, a backlight panel, a backlight controller, a timing controller, and a system-on-a-chip (SoC); the timing controller is connected to the liquid crystal display panel, the SoC, and the backlight controller; the backlight controller is connected to the backlight panel; the timing controller is as described in the second aspect and any embodiment thereof, and the backlight controller is also connected to the timing controller; or, the SoC is as described in the third aspect and any embodiment thereof, and the backlight controller is also connected to the SoC.

[0009] The beneficial effects of this invention are as follows: The backlight driving method and related apparatus provided in this invention, when the second quantity is greater than the first quantity threshold, indicate that there is a large area of ​​low brightness in the display area corresponding to the current backlight partition. At this time, if the LEDs of the same color in the current backlight partition are controlled to emit light at the same brightness, and at least some LEDs of different colors emit light at different brightness, the current backlight partition can emit colored light, solving the problem in the prior art where the current backlight partition emits weak white light or does not emit light, thus sacrificing the color gamut, thereby improving the color gamut and improving the display effect. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of a liquid crystal display device provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of adjacent LEDs emitting light, provided in an embodiment of the present invention. Figure 3 This is a flowchart of a backlight driving method provided in an embodiment of the present invention; Figure 4 This is an example of improving color gamut provided in an embodiment of the present invention; Figure 5A This is an example of color bleeding in existing technology. Figure 5B This is an illustration of an effect provided in an embodiment of the present invention to improve color bleeding; Figure 6 This is a schematic diagram of the structure of a timing controller provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a system-on-a-chip provided in an embodiment of the present invention. Detailed Implementation

[0011] The specific implementation methods of a backlight driving method and related apparatus provided by the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0012] The liquid crystal display device provided in this embodiment of the invention may include, but is not limited to, any product or component with display function such as mobile phones, tablet computers, televisions, monitors, laptops, digital photo frames, and navigators.

[0013] This invention provides a liquid crystal display device, such as... Figure 1 As shown, the liquid crystal display device may include: a liquid crystal display panel, a backlight panel, a backlight controller, a timing controller, and a system-on-a-chip; the timing controller is connected to the liquid crystal display panel, the system-on-a-chip, and the backlight controller respectively; the backlight controller is connected to the backlight panel.

[0014] The backlight panel includes multiple backlight zones, each corresponding to multiple pixels in the liquid crystal display panel, and each pixel includes multiple sub-pixels of different colors. Each backlight zone includes multiple light-emitting units, and each light-emitting unit can be composed of LEDs of various colors. For example, the LEDs can be, but are not limited to, mini LEDs, and the colors of the LEDs can include at least some of the colors such as red, green, blue, and white. Therefore, each backlight zone will include LEDs of various colors, and there will be multiple LEDs of each color.

[0015] The system-on-a-chip can send the RGB image signal k1 to the timing controller. The timing controller converts the RGB image signal k1 into a display signal k2 and transmits it to the liquid crystal display panel so that the liquid crystal display panel can display based on the display signal k2.

[0016] When the backlight controller is also connected to the timing controller, the timing controller can convert the RGB image signal k1 into a local dimming signal k3 according to the correspondence between the backlight partition and the pixel, and then transmit it to the backlight controller. The backlight controller drives the backlight panel to emit light based on the local dimming signal k3, thereby realizing the display function.

[0017] Alternatively, when the backlight controller is also connected to the system-on-a-chip (SoC), the SoC can convert the RGB image signal k1 into a local dimming signal k3 based on the correspondence between the backlight partition and the pixel, and then transmit it to the backlight controller. The backlight controller then drives the backlight panel to emit light based on the local dimming signal k3, thereby realizing the display function.

[0018] In other words, the local dimming signal k3 used to drive the backlight panel to emit light can be generated by a timing controller or by a system-on-a-chip (SoC), depending on actual needs; no specific limitations are made here. It should be understood that in Figure 1 In the diagram, the solid line between the timing controller and the backlight controller indicates that they can be connected, and the dashed line between the system-on-a-chip and the backlight controller also indicates that they can be connected. However, these two connection methods may not coexist, so one connection method is represented by a solid line and the other by a dashed line. Of course, if both connection methods can coexist, this embodiment of the invention is not limited to this.

[0019] For example, taking the generation of a local dimming signal k3 by a timing controller as an example, the conversion of the RGB image signal k1 into the local dimming signal k3 can be achieved through a certain algorithm. However, the specific algorithm used can be set according to actual needs, and the specific form of the algorithm is not limited here. After generating the local dimming signal k3, the distance d0 between the backlight panel and the LCD panel can be set according to information such as the local dimming signal k3, the emission angle θ of each LED when it emits light, and the spacing d1 between adjacent LEDs, so that the emitted light rays of adjacent LEDs do not intersect. Figure 2 As shown, this allows each backlight zone's corresponding LCD panel display area to show a portion of the image, thus enabling the entire LCD panel to display the entire image. It should be understood that the spacing d1 between adjacent LEDs refers to the distance between the centers of two adjacent LEDs. The smaller this distance, the finer the display effect and the higher the display resolution, and vice versa. Furthermore, Figure 2 The example shown uses a light-emitting unit consisting of three LED beads of different colors.

[0020] The local dimming signal k3 used to drive the backlight panel to emit light can also be understood as the signal used to drive each backlight zone to emit light; under the control of the local dimming signal k3, the light emission of each color LED in each backlight zone can be controlled.

[0021] However, when there are large areas of low brightness in the image displayed on the LCD panel, if all the LEDs of different colors in the backlight zone emit light at the same brightness, it will reduce the vividness of the colors, reduce the color gamut of the displayed image, and reduce the display effect.

[0022] Based on this, embodiments of the present invention provide a backlight driving method for improving color gamut and display effect. Exemplarily, the backlight driving method provided by embodiments of the present invention may include: Figure 3 As shown, the following process is performed for any backlight zone: S301. Determine the number of first sub-pixels of each color corresponding to the current backlight partition as the first quantity; the first sub-pixel is a sub-pixel that meets the first brightness requirement, the first brightness requirement includes: the brightness of the sub-pixel is less than the first brightness threshold; S302. Determine the number of adjacent pixels in the first quantity for each color as the second quantity; S303. When the second quantity corresponding to each color is greater than the first quantity threshold, control the LED beads with the same color in the current backlight zone to emit light at the same brightness, and at least some LED beads of different colors to emit light at different brightness.

[0023] Thus, when the second quantity is greater than the first quantity threshold, it indicates that there is a large area of ​​low brightness in the display area of ​​the liquid crystal display panel corresponding to the current backlight zone. At this time, if the LEDs of the same color in the current backlight zone are controlled to emit light at the same brightness, and at least some LEDs of different colors emit light at different brightness, the current backlight zone can emit colored light, solving the problem of the current backlight zone emitting weak white light or not emitting light at all in the prior art, thus sacrificing the color gamut, thereby improving the color gamut and improving the display effect.

[0024] For example, such as Figure 4 As shown, assuming the display area of ​​the LCD panel corresponding to the current backlight zone needs to display a checkerboard pattern of light green and dark green images, such as... Figure 4 As shown in the top left corner of the image; when the current backlight zone emits colored light, it will cause the current backlight zone to emit a greenish light, such as... Figure 4 As shown in the lower left corner of the image, after the greenish light is applied to the liquid crystal display panel, the areas on the panel that should display a light green color will still display a light green color, as shown in the image. Figure 4 As shown in the diagram on the right, this improves the color gamut.

[0025] Among them, brightness is related to grayscale, and the range of grayscale is, for example, but not limited to, 0~255. Grayscale is usually a numerical value; brightness is the actual light intensity emitted by the sub-pixel; there is a mapping relationship between brightness and grayscale, each grayscale corresponds to a brightness, and changes in brightness can reflect changes in grayscale.

[0026] The first brightness requirement may include: the brightness of the sub-pixel is less than the first brightness threshold. When filtering sub-pixels that meet the first brightness requirement, since there are sub-pixels of various colors, the first brightness thresholds corresponding to different colors can be the same, or they can be different.

[0027] Furthermore, the first brightness requirement specifically includes: the brightness of the sub-pixel is less than or equal to a first brightness threshold and greater than a second brightness threshold, where the second brightness threshold is less than the first brightness threshold. This allows for the selection of sub-pixels whose brightness is neither particularly low nor particularly high, and the first and second quantities can be determined based on this selected subset of sub-pixels. Moreover, for sub-pixels with brightness less than the second brightness threshold, it indicates that their brightness is inherently low. Since the human eye has difficulty distinguishing color information in darker areas, the color gamut has a smaller impact on the display effect. Therefore, areas with brightness less than the second brightness threshold do not need to undergo the processing method described in step S303; instead, the original driving method can be used for illumination, reducing the impact on the original image.

[0028] The first brightness threshold is determined based on the brightness at which the human eye can distinguish color differences; the second brightness threshold is determined based on the brightness at which the human eye cannot distinguish color differences. Thus, for areas with brightness below the second brightness threshold, since the human eye can hardly distinguish color differences, these areas do not require adjustment. However, for areas with brightness between the second and first brightness thresholds, the human eye can distinguish color differences, so adjusting these areas will result in an adjusted color gamut that is perceptible to the human eye, thereby improving the display effect for human viewing.

[0029] For example, controlling LEDs of the same color within a current backlight zone to emit light at the same brightness, and at least some LEDs of different colors to emit light at different brightness, includes: controlling LEDs of each color within the current backlight zone to emit light at a first brightness, and at least some LEDs of different colors having different first brightness levels; the first brightness is determined based on one of the following: the maximum brightness in sub-pixels of each color corresponding to the current backlight zone; the minimum brightness in sub-pixels of each color corresponding to the current backlight zone; the average brightness in sub-pixels of each color corresponding to the current backlight zone.

[0030] In this way, each color LED in the current backlight zone can emit light at an appropriate brightness, further improving the color gamut of low-brightness areas and further enhancing the display effect.

[0031] For example, suppose the current backlight zone corresponds to three colors of LEDs: red, green, and blue. The first brightness corresponding to the red LED can be the maximum brightness in the sub-pixel, the first brightness corresponding to the green LED can be the average brightness in the sub-pixel, and the first brightness corresponding to the blue LED can be the maximum brightness in the sub-pixel. Alternatively, the first brightness corresponding to the red LED can be the product of the maximum brightness in the sub-pixel and a first coefficient, the first brightness corresponding to the green LED can be the product of the maximum brightness in the sub-pixel and a second coefficient, and the first brightness corresponding to the blue LED can be the product of the maximum brightness in the sub-pixel and a third coefficient, where the first, second, and third coefficients are different. And so on, not all examples will be listed here.

[0032] In other words, when determining the first brightness, taking the determination based on the maximum brightness of the sub-pixels of each color corresponding to the current backlight partition as an example, the first brightness can be the maximum brightness, or the product of the maximum brightness and a coefficient, or the sum of the maximum brightness and a constant, or the difference between the maximum brightness and a constant, etc., and there are no restrictions here. Furthermore, the coefficients (or constants) in the first brightness corresponding to different colored LEDs can be different or partially different.

[0033] Within the current backlight zone, all LEDs of different colors can emit light at different brightness levels, or some LEDs of different colors can emit light at different brightness levels. The specific configuration can be determined based on the situation and is not restricted here.

[0034] Furthermore, the first brightness can be the weighted value of the maximum brightness in the sub-pixels of each color corresponding to the current backlight partition. At least some colors of LEDs in the current backlight partition have different weights, which can enable LEDs of different colors to emit light at appropriate brightness and improve the color gamut of low-brightness areas.

[0035] For example, the backlight driving method further includes: determining the number of color types in the display screen corresponding to the current backlight partition as a third quantity; when the second quantity corresponding to any color is less than or equal to the first quantity threshold and the third quantity is greater than the second quantity threshold, controlling the LEDs with the same color in the current backlight partition to emit light at the same brightness, and at least some LEDs with different colors to emit light at different brightness.

[0036] If we consider "controlling LEDs of the same color within the current backlight zone to emit light at the same brightness, and at least some LEDs of different colors to emit light at different brightness" as the first backlight driving method, then when the second quantity corresponding to any color is less than or equal to the first quantity threshold, that is, when the condition that the second quantity corresponding to each color is greater than the first quantity threshold is not met, we can still determine whether to adopt the first backlight driving method based on the color types in the display screen corresponding to the current backlight zone.

[0037] When the third quantity is greater than the second quantity threshold, it indicates that the display screen corresponding to the current backlight zone has a large number of color types and is a relatively complex screen. Such a screen has high requirements for color gamut, or in other words, color gamut has a greater impact on such a screen. Therefore, the first backlight driving method is adopted, which can make the current backlight zone emit colored light, thereby improving the color gamut.

[0038] For example, the backlight driving method further includes: determining that the display screen corresponding to the current backlight partition has N colors; determining that the number of pixels corresponding to each color in the display screen corresponding to the current backlight partition is a fourth number; when the second number corresponding to any color is less than or equal to the first number threshold, the fourth number is greater than the third number threshold, and the value of N is greater than the fourth number threshold, controlling the LEDs with the same color in the current backlight partition to emit light at the same brightness, and at least some LEDs with different colors to emit light at different brightness.

[0039] When the second quantity corresponding to any color is less than or equal to the first quantity threshold, that is, when the condition that the second quantity corresponding to each color is greater than the first quantity threshold is not met, it is also possible to determine whether to adopt the first backlight driving method based on the distribution of colors in the display screen corresponding to the current backlight partition.

[0040] When the fourth quantity is greater than the third quantity threshold and the value of N is greater than the fourth quantity threshold, it indicates that there are large areas of the same color in the display screen corresponding to the current backlight partition, and there are many such large areas of the same color, each with a different color. Such a screen is a relatively complex screen, which has high requirements for color gamut, or in other words, color gamut has a significant impact on such a screen. Therefore, the first backlight driving method is adopted, which can make the current backlight partition emit colored light, thereby improving the color gamut.

[0041] In practice, within a single backlight zone, different pixels may emit different colors of light. When the light from the backlight zone illuminates pixels of different colors, severe color mixing can occur. For example, suppose a backlight zone emits a light green light, but a portion of the LCD panel corresponding to that zone needs to display white. Under the influence of the light green backlight, the area that should actually display white will ultimately appear light green, resulting in color mixing from white to light green and degrading the display quality.

[0042] Based on this, for example, the backlight driving method further includes: determining the number of second sub-pixels of each color corresponding to the current backlight partition as the fifth number, the second sub-pixels satisfying the second brightness requirement, the second brightness requirement including: brightness greater than the first brightness threshold; determining the number of adjacent pixels in the fifth number corresponding to each color as the sixth number; when the second number corresponding to any color is less than or equal to the first number threshold, and the sixth number corresponding to each color is greater than the fifth number threshold, controlling all LEDs in the current backlight partition to emit light based on the same brightness.

[0043] Therefore, if the condition that the second quantity corresponding to each color is greater than the first quantity threshold is not met, but the sixth quantity is greater than the fifth quantity threshold, it indicates that there is a large area of ​​high brightness in the display area of ​​the liquid crystal display panel corresponding to the current backlight zone. If the current backlight zone still emits colored light, then color crosstalk will occur in the picture displayed by the liquid crystal display panel. At this time, if all the light-emitting units in the current backlight zone are controlled to emit light based on the same brightness, so that the light emitted by the current backlight zone is white and does not have color, then the light emitted by the current backlight zone will not have color, thereby avoiding the color in the backlight from causing color crosstalk to the color to be displayed by the liquid crystal display panel, thereby improving the display effect.

[0044] For example, suppose the display area of ​​the LCD panel corresponding to the current backlight zone needs to display a checkerboard pattern of white and green, such as Figure 5A and Figure 5B As shown in the top left corner of the image; when the current backlight zone emits light using its original driving method, it will cause the current backlight zone to emit a light green light, such as... Figure 5A As shown in the lower left corner of the image, when the light green light is applied to the liquid crystal display panel, the areas on the liquid crystal display panel that need to display white will appear light green, as shown in the image. Figure 5A As shown in the right-hand diagram, this is why color bleeding occurs. When the current backlight zone emits white light, it will cause the current backlight zone to emit white light, as shown in the diagram on the right. Figure 5B As shown in the lower left corner of the image, after the white light is applied to the liquid crystal display panel, the areas on the liquid crystal display panel that need to display white will still display white, as shown in the image. Figure 5B As shown in the diagram on the right, this solves the color mixing problem. It should be noted that this example only illustrates the display of a white and green checkerboard pattern; it does not mean that the actual display can only be a white and green checkerboard pattern.

[0045] The first brightness threshold can be determined not only based on the brightness corresponding to the color difference that the human eye can distinguish, but also based on factors such as the degree of acceptance of color bleeding. For example, if the degree of acceptance of color bleeding is high, it means that a certain amount of color bleeding can be allowed, and the first brightness threshold can be set higher. If the degree of acceptance of color bleeding is low, it means that color bleeding is not allowed, and the first brightness threshold can be set lower, thereby improving the effect of color bleeding repair and improving the display effect.

[0046] For example, controlling all LEDs in the current backlight zone to emit light based on the same brightness specifically includes: determining the second brightness in the sub-pixels of each color corresponding to the current backlight zone; the second brightness is: maximum brightness, minimum brightness, or average brightness; determining the third brightness based on the statistically determined second brightness of each color; and controlling all LEDs in the current backlight zone to emit light based on the third brightness.

[0047] In this way, the second brightness can be determined according to actual needs, and the third brightness can be determined based on the second brightness, so that the current backlight zone emits light at an appropriate brightness. This avoids color mixing and also avoids the reduction in display effect caused by the inappropriate brightness of the backlight zone.

[0048] The third brightness is determined based on one of the following: the maximum value of the second brightness for each color, the minimum value of the second brightness for each color, the average value of the second brightness for each color, or the weighted sum of the second brightness values ​​for each color.

[0049] Taking the third brightness as an example, which is determined based on the maximum value of the second brightness of each color, the third brightness is the maximum value of the second brightness of each color, or the third brightness is the maximum value of the second brightness of each color multiplied by a certain coefficient, or the third brightness is the maximum value of the second brightness of each color plus a constant, etc., without any restrictions here.

[0050] In other words, the third brightness can be the weighted value of the maximum value among the second brightness values ​​for each color. For example, suppose the current backlight zone corresponds to red sub-pixels, green sub-pixels, and blue sub-pixels. The red sub-pixel corresponds to a second brightness value, the green sub-pixel corresponds to a second brightness value, and the blue sub-pixel corresponds to a second brightness value. Find the maximum value among these three second brightness values, and then calculate the weighted value of this maximum value to obtain the third brightness value.

[0051] When the third brightness is the sum of the weighted values ​​of the second brightness of each color, for example, assuming that the current backlight zone corresponds to red sub-pixels, green sub-pixels and blue sub-pixels, the red sub-pixel corresponds to one second brightness, the green sub-pixel corresponds to one second brightness and the blue sub-pixel corresponds to one second brightness, the weighted values ​​of these three second brightnesses are calculated separately to obtain three weighted values, and then the sum of the three weighted values ​​is the third brightness, where the weights in the three weighted values ​​can be different or partially different.

[0052] In this way, a more suitable third brightness can be found, avoiding color bleeding while also preventing a decrease in display effect caused by unsuitable backlight brightness of the backlight zones.

[0053] Of course, the third brightness can also be a pre-configured brightness, which can save the calculation process of the third brightness and directly call the pre-configured brightness to drive the current backlight zone, thus reducing the amount of calculation and power consumption.

[0054] Based on the above description, in this embodiment of the invention, if the second quantity corresponding to each color is greater than the first quantity threshold as the first judgment condition, the third quantity is greater than the second quantity threshold as the second judgment condition, the fourth quantity is greater than the third quantity threshold and the value of N is greater than the fourth quantity threshold as the third judgment condition, and the sixth quantity corresponding to each color is greater than the fifth quantity threshold as the fourth judgment condition, and controlling all LEDs in the current backlight zone to emit light based on the same brightness is regarded as the second backlight driving method, and if the priority of each judgment condition from high to low is: first judgment condition, fourth judgment condition, second judgment condition, third judgment condition, then when the first judgment condition is not met, the following process can be executed: First, determine whether the fourth condition is met; if it is, use the second backlight driving method; if not, determine whether the second condition is met; if it is, use the first backlight driving method; if not, determine whether the third condition is met; if it is, use the first backlight driving method; if not, use the original driving method.

[0055] In this way, the color gamut can be improved when there are large areas of low brightness; color bleeding can be avoided when there are large areas of high brightness; and the color gamut can be improved when displaying complex images. Thus, a variety of display problems in LCD devices can be solved and the display effect can be improved.

[0056] Of course, if it is determined that the first condition is not met, there is no need to check whether the other conditions are met. Alternatively, if it is determined that the first condition is not met, it is only necessary to check whether the fourth condition is met, without checking whether the other conditions are met. Or, if it is determined that the first condition is not met, it is only necessary to check whether the second condition is met, without checking whether the other conditions are met. And so on, without listing them all here.

[0057] Therefore, in this embodiment of the invention, the first judgment condition can be combined with any of the other three judgment conditions to meet the display requirements of different scenarios.

[0058] For example, the various quantity thresholds mentioned above can be determined based on the brightness corresponding to the human eye when distinguishing color differences. Among the various quantity thresholds, at least some may be the same or all may be different. The specifics can be determined according to the actual situation and are not limited here.

[0059] For example, regardless of whether the backlight zone emits white light or colored light, when controlling the backlight zone to emit light, the backlight controller can convert the corresponding local dimming signal into a corresponding current signal and pulse signal after receiving the corresponding local dimming signal. The LEDs in the backlight zone emit light under the drive of the current signal and pulse signal.

[0060] The following will describe the specific implementation examples.

[0061] Note: In the following embodiments, the focus is on the i-th backlight zone, where i is a positive integer. For example, each light-emitting unit in the backlight zone includes red LEDs, green LEDs, and blue LEDs, and each pixel of the liquid crystal display panel includes red sub-pixels, green sub-pixels, and blue sub-pixels.

[0062] Example 1 : Taking the example of driving the backlight based solely on the first condition, the specific backlight driving method is as follows: Step 1: Count the number of red sub-pixels with brightness less than the first brightness threshold among all red sub-pixels corresponding to the backlight zone, and record it as R1. Count the number of green sub-pixels with brightness less than the first brightness threshold among all green sub-pixels corresponding to the backlight zone, and record it as G1. Count the number of blue sub-pixels with brightness less than the first brightness threshold among all blue sub-pixels corresponding to the backlight zone, and record it as B1. The first brightness threshold can be determined based on factors such as the brightness corresponding to the human eye's ability to distinguish color differences. For example, the first brightness threshold can be, but is not limited to, 25, 30, 40, 200, etc., and is not specifically limited here. Red, green, and blue sub-pixels with brightness less than the first brightness threshold all correspond to the first sub-pixel mentioned above.

[0063] Step 2: Count the number of adjacent pixels in R1 and record it as R11, count the number of adjacent pixels in G1 and record it as G11, and count the number of adjacent pixels in B1 and record it as B11. Step 3: Determine whether R11, G11, and B11 are all greater than the first quantity threshold; if yes, proceed to step 4; if no, proceed to step 5. The first quantity threshold can be determined based on factors such as brightness when the human eye distinguishes color differences. For example, the first quantity threshold is an integer greater than 1. Furthermore, the first quantity threshold can be, but is not limited to, any value from 5 to 10.

[0064] Step 4: Control the LEDs of the same color within the current backlight zone to emit light at the same brightness, and at least some LEDs of different colors to emit light at different brightness; end the process. Step 5: Control all LEDs in the backlight zone to emit light in the original manner.

[0065] Example 2 : Taking the backlight driving method based on the first and fourth judgment conditions as an example, the specific backlight driving method is as follows: Step 1: Count the number of red sub-pixels with brightness greater than the first brightness threshold among all red sub-pixels corresponding to the backlight zone, and record it as R2; count the number of green sub-pixels with brightness greater than the first brightness threshold among all green sub-pixels corresponding to the backlight zone, and record it as G2; count the number of blue sub-pixels with brightness greater than the first brightness threshold among all blue sub-pixels corresponding to the backlight zone, and record it as B2; count the number of red sub-pixels with brightness less than the first brightness threshold among all red sub-pixels corresponding to the backlight zone, and record it as R3; count the number of green sub-pixels with brightness less than the first brightness threshold among all green sub-pixels corresponding to the backlight zone, and record it as G3; count the number of blue sub-pixels with brightness less than the first brightness threshold among all blue sub-pixels corresponding to the backlight zone, and record it as B3. The first brightness thresholds for different colors can be the same or different. For example, the first brightness for red can be, but is not limited to, 40; for green, it can be, but is not limited to, 30; for blue, it can be, but is not limited to, 25, and so on. No specific limitations are made here. Red, green, and blue sub-pixels with brightness greater than the first brightness threshold all correspond to the second sub-pixels mentioned earlier.

[0066] Step 2: Count the number of adjacent pixels in R2 and record it as R22, count the number of adjacent pixels in G2 and record it as G22, count the number of adjacent pixels in B2 and record it as B22; count the number of adjacent pixels in R3 and record it as R33, count the number of adjacent pixels in G3 and record it as G33, count the number of adjacent pixels in B3 and record it as B33. Step 3: Determine whether R33, G33, and B33 are all greater than the first quantity threshold; if yes, proceed to step 4; if no, proceed to step 5. Step 4: Control the LEDs of the same color within the current backlight zone to emit light at the same brightness, and at least some LEDs of different colors to emit light at different brightness; end the process. Step 5: Determine whether R22, G22, and B22 are all greater than the fifth quantity threshold; if yes, proceed to step 6; if no, proceed to step 7. The fifth quantity threshold can be determined based on factors such as brightness when the human eye distinguishes color differences. For example, the fifth quantity threshold is an integer greater than 1. Furthermore, the fifth quantity threshold can be, but is not limited to, any value from 5 to 10.

[0067] Step 6: Control all LEDs within the current backlight zone to emit light at the same brightness; end the process. Step 7: Control all LEDs in the backlight zone to emit light in the original manner.

[0068] Example 3 : Taking the driving based on the first and fourth judgment conditions as an example, the difference between this embodiment three and the aforementioned embodiment two is that step 1 in embodiment two is adjusted to step s1. Step s1 is as follows: count the number of red sub-pixels with brightness greater than the first brightness threshold among all red sub-pixels corresponding to the backlight partition and record it as R4; count the number of green sub-pixels with brightness greater than the first brightness threshold among all green sub-pixels corresponding to the backlight partition and record it as G4; count the number of blue sub-pixels with brightness greater than the first brightness threshold among all blue sub-pixels corresponding to the backlight partition and record it as B4; count the number of red sub-pixels with brightness less than or equal to the first brightness threshold and greater than the second brightness threshold among all red sub-pixels corresponding to the backlight partition and record it as R5; count the number of green sub-pixels with brightness less than or equal to the first brightness threshold and greater than the second brightness threshold among all green sub-pixels corresponding to the backlight partition and record it as G5; count the number of blue sub-pixels with brightness less than or equal to the first brightness threshold and greater than the second brightness threshold among all blue sub-pixels corresponding to the backlight partition and record it as B5. The first brightness threshold can be determined based on the brightness corresponding to the color difference that the human eye can distinguish, and the second brightness threshold can be determined based on the brightness corresponding to the color difference that the human eye cannot distinguish. For example, the first brightness threshold is 200, the second brightness threshold is 5, etc., and no specific limitation is made here.

[0069] In this third embodiment, adjustments are made to backlight zones with a certain number of areas whose brightness is at or above the second brightness threshold, while backlight zones with a certain number of areas whose brightness is below the second brightness threshold are not adjusted. This avoids affecting the contrast and allows areas with a certain number of areas whose brightness is below the second brightness threshold to display their original brightness and color, thereby reducing the impact on the original image.

[0070] Based on the same inventive concept, embodiments of the present invention provide a timing controller, such as... Figure 6 As shown, it includes: a memory for storing program instructions; and a processor for calling the program instructions stored in the memory and executing the backlight driving method described above according to the obtained program. That is, the local dimming signal used to drive the backlight zones to emit light is generated by a timing controller. Of course, the timing controller can also include other components, depending on the specific functions to be implemented; no specific limitations are made here.

[0071] Based on the same inventive concept, embodiments of the present invention provide a system-on-a-chip, such as... Figure 7 As shown, it includes: a memory for storing program instructions; and a processor for calling the program instructions stored in the memory and executing the backlight driving method described above according to the obtained program. In other words, the local dimming signals used to drive the backlight zones are generated by the system-on-a-chip (SoC). Of course, the SoC can also include other components, depending on the functional design required by the SoC; specific limitations are not specified here.

[0072] In summary, the technical solution provided by the embodiments of the present invention has the following advantages: by designing the backlight driving method, the color gamut can be improved and cross-color can be reduced, thereby improving the display effect of the liquid crystal display device, improving the display quality, making the color purity higher, the user experience better, and the visual comfort also improved.

[0073] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A backlight driving method, characterized in that, include: In a backlight partition with multiple backlight zones, each backlight zone corresponds to multiple pixels, and each pixel includes multiple sub-pixels of different colors. Each backlight zone also includes multiple LEDs of various colors, with multiple LEDs of each color. For any given backlight zone, the following process is performed: The number of first sub-pixels of each color corresponding to the current backlight partition is determined as a first quantity; the first sub-pixel is a sub-pixel that meets a first brightness requirement, the first brightness requirement including: the brightness of the sub-pixel is less than a first brightness threshold; The number of adjacent pixels in the first quantity corresponding to each color is determined as the second quantity; When the second quantity corresponding to each color is greater than the first quantity threshold, the LED beads with the same color in the current backlight zone are controlled to emit light at the same brightness, and at least some of the LED beads with different colors emit light at different brightness.

2. The backlight driving method as described in claim 1, characterized in that, The first brightness requirement specifically includes: the brightness of the sub-pixel is less than or equal to the first brightness threshold and greater than the second brightness threshold, wherein the second brightness threshold is less than the first brightness threshold.

3. The backlight driving method as described in claim 2, characterized in that, The first brightness threshold is determined based on the brightness corresponding to the human eye when distinguishing color differences; The second brightness threshold is determined based on the brightness corresponding to the point where the human eye cannot distinguish color differences.

4. The backlight driving method as described in claim 1, characterized in that, Controlling the LEDs of the same color within the current backlight zone to emit light at the same brightness, and controlling at least some of the LEDs of different colors to emit light at different brightness, includes: The LEDs of each color in the current backlight zone are controlled to emit light at a first brightness, and at least some of the LEDs of different colors have different first brightness levels. The first brightness is determined based on one of the following: the maximum brightness of the sub-pixels of each color corresponding to the current backlight partition; the minimum brightness of the sub-pixels of each color corresponding to the current backlight partition; or the average brightness of the sub-pixels of each color corresponding to the current backlight partition.

5. The backlight driving method as described in claim 4, characterized in that, The first brightness is the weighted value of the maximum brightness in the sub-pixels of each color corresponding to the current backlight partition, and the weights of the LED beads are different for at least some colors in the current backlight partition.

6. The backlight driving method as described in claim 1, characterized in that, The backlight driving method further includes: The number of color types in the display screen corresponding to the current backlight partition is determined as the third quantity; When the second quantity corresponding to any color is less than or equal to the first quantity threshold and the third quantity is greater than the second quantity threshold, the LED beads with the same color in the current backlight zone are controlled to emit light at the same brightness, and at least some of the LED beads with different colors emit light at different brightness.

7. The backlight driving method as described in claim 1, characterized in that, The backlight driving method further includes: It is determined that the display screen corresponding to the current backlight zone has N colors; The number of pixels corresponding to each color in the display screen corresponding to the current backlight partition is determined as the fourth quantity; When the second quantity corresponding to any color is less than or equal to the first quantity threshold, the fourth quantity is greater than the third quantity threshold, and the value of N is greater than the fourth quantity threshold, the LED beads with the same color in the current backlight zone are controlled to emit light at the same brightness, and at least some of the LED beads with different colors emit light at different brightness.

8. The backlight driving method according to any one of claims 1-7, characterized in that, The backlight driving method further includes: The number of second sub-pixels of each color corresponding to the current backlight partition is determined to be the fifth number, and the second sub-pixels meet the second brightness requirement, which includes: the brightness is greater than the first brightness threshold. The sixth quantity is determined from the fifth quantity corresponding to each color; When the second quantity corresponding to any color is less than or equal to the first quantity threshold, and the sixth quantity corresponding to each color is greater than the fifth quantity threshold, control all the LEDs in the current backlight zone to emit light based on the same brightness.

9. The backlight driving method as described in claim 8, characterized in that, Controlling all the LEDs within the current backlight zone to emit light at the same brightness includes: Determine the second brightness in the sub-pixels of each color corresponding to the current backlight partition; the second brightness is: maximum brightness, minimum brightness, or average brightness; The third brightness is determined based on the statistically analyzed second brightness of each color; Control all the LEDs in the current backlight zone to emit light based on the third brightness.

10. The backlight driving method as described in claim 9, characterized in that, The third brightness is determined based on one of the following: the maximum value of the second brightness for each color, the minimum value of the second brightness for each color, the average value of the second brightness for each color, or the weighted sum of the second brightness for each color.

11. A timing controller, characterized in that, include: Memory, used to store program instructions; A processor is configured to invoke the program instructions stored in the memory and execute the backlight driving method as described in any one of claims 1-10 according to the obtained program.

12. A system-on-a-chip, characterized in that, include: Memory, used to store program instructions; A processor is configured to invoke the program instructions stored in the memory and execute the backlight driving method as described in any one of claims 1-10 according to the obtained program.

13. A liquid crystal display device, characterized in that, include: The system comprises a liquid crystal display panel, a backlight panel, a backlight controller, a timing controller, and a system-on-a-chip (SoC); the timing controller is connected to the liquid crystal display panel, the SoC, and the backlight controller; the backlight controller is connected to the backlight panel. The timing controller is the timing controller as described in claim 11, and the backlight controller is also connected to the timing controller; or, the system-on-a-chip is the system-on-a-chip as described in claim 12, and the backlight controller is also connected to the system-on-a-chip.

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