Display device with backlight and method therefor

Abstract

The present application relates to a display device, comprising a backlight module and a control circuit. The control circuit divides an input image into a plurality of blocks, calculates a backlight parameter for each of the plurality of blocks, calculates a first duty cycle offset and a second duty cycle offset according to a plurality of duty cycles in the backlight parameter, calculates a first weight value and a second weight value according to a maximum duty cycle, a minimum duty cycle and a duty cycle mean, and calculates a peak duty cycle according to the first duty cycle offset, the second duty cycle offset, the first weight value and the second weight value. The control circuit is further configured to generate an output backlight parameter according to the peak duty cycle, wherein corresponding light emitting units of the backlight module are driven according to the output backlight parameter.

Description

Technical Field

[0001] This invention relates to a display device, and more particularly to a display device having a backlight module and a method thereof, the backlight module having the ability to improve the display quality of the display device. Background Technology

[0002] Liquid crystal display (LCD) devices often include a backlight module, which is configured to illuminate the display panel of the LCD device. The backlight module must be properly controlled to produce high-quality images displayed on the LCD device. Backlight dimming is a technique used to improve the contrast and quality of images displayed on the display panel. With the increasing demand for high-quality display devices, the need to further improve the performance of backlight dimming technology for display devices is also growing. Summary of the Invention

[0003] The present invention provides a display device with a backlight module and a method thereof, which can improve the display quality of the display device.

[0004] The display device of this invention may include a backlight module and a control circuit, wherein the backlight module includes a plurality of light-emitting units. The control circuit is configured to: divide an input image into a plurality of blocks, and calculate backlight parameters for each of the plurality of blocks, wherein each of the backlight parameters corresponds to one of the light-emitting units for controlling the brightness of the corresponding light-emitting unit, and each of the backlight parameters includes a plurality of duty cycles. The control unit is further configured to calculate a first duty cycle offset and a second duty cycle offset based on the plurality of duty cycles in the backlight parameters of each of the plurality of blocks; and to determine the maximum duty cycle, the minimum duty cycle, and the average duty cycle of the plurality of duty cycles. The control unit is further configured to calculate a first weight value and a second weight value based on the maximum duty cycle, the minimum duty cycle, and the average duty cycle; and to calculate a peak duty cycle based on the plurality of duty cycles, the first duty cycle offset, the second duty cycle offset, the first weight value, and the second weight value. The control unit is further configured to generate output backlight parameters based on the peak duty cycle, wherein the corresponding light-emitting unit of the backlight module is driven according to the output backlight parameters.

[0005] The method applicable to a display device according to embodiments of the present invention may include the following steps: dividing an input image into multiple blocks, and calculating backlight parameters for each of the multiple blocks, wherein each of the backlight parameters corresponds to one of the light-emitting units for controlling the brightness of the corresponding light-emitting unit, and each of the backlight parameters includes multiple duty cycles; calculating a first duty cycle offset and a second duty cycle offset based on the multiple duty cycles of the backlight parameters for each of the multiple blocks; determining the maximum duty cycle, the minimum duty cycle, and the average duty cycle of the multiple duty cycles; calculating a first weight value and a second weight value based on the maximum duty cycle, the minimum duty cycle, and the average duty cycle; calculating a peak duty cycle based on the multiple duty cycles, the first duty cycle offset, the second duty cycle offset, the first weight value, and the second weight value; and generating output backlight parameters based on the peak duty cycle, wherein the corresponding light-emitting unit of the backlight module is driven according to the output backlight parameters.

[0006] In some embodiments, backlight parameters for controlling the backlight module of a display device are adjusted according to a first weight value and a second weight value, wherein the first weight value and the second weight value are calculated based on the maximum duty cycle, minimum duty cycle, and average duty cycle of multiple duty cycles for each backlight parameter. The first weight value may indicate the contrast of the input image, and the second weight value may indicate the brightness change of the input image. In this way, the backlight parameters are effectively adjusted according to the content of the input image, and the quality of the image displayed on the display device is improved. In addition, each of the backlight parameters may further include a current value for controlling the brightness of the backlight module, wherein the current value is adjusted when the peak duty cycle is greater than a preset duty cycle. In this way, the backlight module is efficiently controlled even when the peak duty cycle is greater than 100%.

[0007] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0008] Figure 1 This is a schematic diagram illustrating a display device according to some embodiments.

[0009] Figure 2 This is a flowchart illustrating a method for controlling a backlight module of a display device according to some embodiments.

[0010] Figure 3 This is a graph illustrating the relationship between the input duty cycle and the duty cycle offset according to some embodiments.

[0011] Figure 4This is a diagram illustrating the adjustment of backlight parameters, including duty cycle and current value, according to some embodiments.

[0012] Figure 5A and Figure 5B Exemplary work cycle histograms before and after adjustment according to some embodiments are shown.

[0013] Figure 6 This is a flowchart illustrating a method applicable to a display device including a backlight module according to some embodiments.

[0014] List of reference numerals

[0015] 100: Display device

[0016] 110: Display panel

[0017] 120: Backlight Module

[0018] 130: Memory

[0019] 140: Control Circuit

[0020] 140_P, 142a: Backlight parameters

[0021] 141, 142, 143, 144, 145_1, 145_2, 146, 147, 148, 149, 610, 620, 630, 640, 650, 660: squares

[0022] 301: Peak Offset LUT / LUT

[0023] 302: Mean Offset LUT / LUT

[0024] 401, 402: Lines

[0025] AR1, AR2: Arrows

[0026] duty_pk: Peak duty cycle

[0027] I1, I2: Current values

[0028] IN_IMG: Input image

[0029] M_shift(x): Mean shift

[0030] OUT_IMG: Output image

[0031] P_shift (x): Peak offset

[0032] x: Input the work cycle. Detailed Implementation

[0033] Other embodiments and structural changes may be utilized without departing from the scope of the invention. Furthermore, the wording and terminology used herein are for illustrative purposes and should not be construed as limiting the invention. The use of “comprising,” “including,” or “having,” and variations thereof, herein is intended to cover the items listed thereafter and their equivalents, as well as any additional items.

[0034] Reference Figure 1 According to some embodiments, a display device 100 is shown, including a display panel 110, a backlight module 120, a memory 130, and a control circuit 140. The display panel 110 is configured to display image data of an output image OUT_IMG output by the control circuit 140. The display panel 110 may be a liquid crystal display (LCD) panel, such as a fringe fields switching (FFS) panel, an in-plane switching (IPS) panel, a twisted nematic (TN) panel, and a vertical alignment (VA) panel, which is not limited in this invention.

[0035] The backlight module 120 can be divided into multiple light-emitting units (or blocks), which can individually illuminate the display panel 110 under the control of backlight parameters 140_P output by the self-control circuit 140. The backlight module 120 can be controlled by at least one pulse-width modulation (PWM) control signal, which has an operating cycle representing the ratio of the illumination time to the entire cycle of the PWM control signal. In some embodiments, each of the light-emitting units (not shown) includes multiple light sources, wherein each light source is controlled by the operating cycle of the PWM control signal. The light sources of the backlight module 120 can be light-emitting diodes (LEDs), but the invention is not limited thereto.

[0036] The backlight parameter 140_P may include the duty cycle corresponding to the light source in each light-emitting unit of the backlight module 120. Each backlight parameter 140_P is used to adjust the brightness of the corresponding light-emitting unit. For example, the backlight parameter 140_P includes the duty cycle of each light source, where 100% corresponds to maximum brightness and 0% corresponds to minimum brightness. In some embodiments, each backlight parameter further includes a current value, wherein the brightness of each light source can be adjusted according to the current value. For example, as the current value applied to the light source increases, the brightness of the light source increases.

[0037] Control circuit 140 can receive an input image IN_IMG and perform at least one operation on the input image IN_IMG to generate an output image OUT_IMG. The at least one operation may include improving the quality of the input image IN_IMG and / or reducing the noise of the input image IN_IMG, thereby improving the quality of the image displayed on display panel 110. Control circuit 140 is further configured to determine backlight parameters 140_P for controlling backlight module 120. For example, control circuit 140 may determine the clock cycle and current value included in the backlight parameters of each light source of each light-emitting unit of backlight module 120. In some embodiments, control circuit 140 determines backlight parameters 140_P based on the input image IN_IMG and at least one look-up table (LUT) stored in memory 130. The LUT stored in memory 130 may include... Figure 3 The mean offset LUT and peak offset LUT shown are shown.

[0038] In some embodiments, the display device 100 further includes a backlight driver (not shown) configured to drive the backlight module 120 according to backlight parameters 140_P. Control circuitry 140 may be coupled to the backlight driver or may be included in the backlight driver of the display device 100. In some embodiments, the display device 100 further includes a timing controller (not shown) that generates a synchronization control signal (i.e., a vertical synchronization signal), wherein the backlight module 120 may be driven synchronously with the synchronization control signal. Control circuitry 140 may be coupled to the timing controller or may be included in the timing controller of the display device 100.

[0039] Reference Figure 2 A flowchart of a method for controlling circuit 140 is shown according to some embodiments. Figure 2 Each block shown can be implemented by hardware (e.g., a digital image processor), software (e.g., a computer program), or a combination thereof. In blocks 141 to 143, control circuitry 140 receives an input image IN_IMG and performs local dimming operations based on the input image IN_IMG to generate an output image OUT_IMG. Control circuitry 140 can perform at least one processing operation on the input image IN_IMG to generate the output image OUT_IMG. The present invention is not intended to limit the processing operations. For example, processing operations can be performed to reduce noise in the input image, improve image quality, and / or for any other purpose. The input image IN_IMG may include multiple pixels, and each pixel includes grayscale levels, such as red grayscale, green grayscale, and blue grayscale. The output image OUT_IMG is displayed on the display panel 110 of the display device 100.

[0040] In block 142, control circuit 140 is further configured to generate backlight parameters 142a based on the grayscale of the pixels of the input image IN_IMG. In some embodiments, control circuit 140 is configured to divide the input image IN_IMG into multiple blocks (not shown), each block comprising multiple pixels of the input image IN_IMG. The size of each block is determined according to design requirements and is not limited to any specific value. Control circuit 140 can calculate the backlight parameters 142a for each block of the input image IN_IMG based on the grayscale of the pixels in the block. Each backlight parameter 142a corresponds to a light-emitting unit of backlight module 120, and each backlight parameter 142a is configured to control the brightness of the corresponding light-emitting unit. In some embodiments, each backlight parameter 142a includes at least one duty cycle of a pulse width modulation (PWM) signal for controlling the light source included in the corresponding light-emitting unit of backlight module 120. For example, the backlight parameter 142a of a block may include the duty cycle of each light source, where 100% duty cycle corresponds to the maximum brightness of the light source and 0% duty cycle corresponds to the minimum brightness of the light source. Generally, the duty cycle is longer when the pixels in the corresponding block are brighter and shorter when the pixels are darker. In some embodiments, the duty cycle is recorded as an 8-bit value and the value of the duty cycle is in the range of 0 to 255.

[0041] In some embodiments, each backlight parameter 142a corresponds to one block of the input image IN_IMG and one light-emitting unit of the backlight module 120. Each backlight parameter 142a includes a duty cycle for controlling the light source in the corresponding light-emitting unit of the backlight module 120. In block 144, the control circuit 140 generates the duty cycle for each block based on the backlight parameter 142a output from block 142. In blocks 145_1 and 145_2, for each block of the input image IN_IMG, the control circuit 140 calculates the maximum duty cycle, the minimum duty cycle, and the average duty cycle of the block's duty cycles. For example, the maximum duty cycle (duty_max), minimum duty cycle (duty_min), and average duty cycle (duty_mean) of a block of size n*n are calculated according to equations (1) to (3), where n is a positive integer:

[0042] duty_max = max(1: n*n) (1)

[0043] duty_min = min(1:n*n) (2)

[0044] duty_mean = sum(1:n*n) / (n*n) (3)

[0045] In block 146, control circuit 140 calculates weight values ​​w1 and w2 based on the maximum duty cycle (duty_max), minimum duty cycle (duty_min), and average duty cycle (duty_mean). For example, when the duty cycle is recorded in 8-bit values, the weight values ​​w1 and w2 are calculated according to the following equations (4) and (5):

[0046] w1 = (duty_max-duty_min) / 256 (4)

[0047] w2 = (duty_mean-duty_min) / 256 (5)

[0048] As shown in equations (5) and (6), the weight value w1 is calculated based on the difference between the maximum duty cycle (duty_max) and the minimum duty cycle (duty_min). The difference between the maximum duty cycle (duty_max) and the minimum duty cycle (duty_min) indicates the contrast of the pixels in the input image IN_IMG. Additionally, the weight value w2 is calculated based on the difference between the mean duty cycle (duty_mean) and the minimum duty cycle (duty_min). The difference between the mean duty cycle (duty_mean) and the minimum duty cycle (duty_min) indicates the brightness change of the pixels in the input image IN_IMG. In this way, the adjusted backlight parameter 140_P can be rewritten according to the content of the input image IN_IMG.

[0049] In block 147, control circuit 140 determines peak offset P_shift and mean offset M_shift (also referred to as first duty cycle offset and second duty cycle offset) based on the duty cycle (also referred to as input duty cycle) provided from block 144. In some embodiments, control circuit 140 determines the peak offset P_shift and mean offset M_shift (also referred to as first duty cycle offset and second duty cycle offset) based on the duty cycle (also referred to as input duty cycle) pre-stored in memory (i.e., Figure 1 The peak offset P_shift and mean offset M_shift are determined by the peak offset LUT and mean offset LUT in the memory 130 of the display device 100. The peak offset LUT can record the relationship between the working cycle (i.e., the input working cycle) and the corresponding peak offset P_shift; and the mean offset LUT can record the relationship between the working cycle and the corresponding mean offset M_shift.

[0050] Figure 3 This is a diagram illustrating exemplary peak offset LUT 301 and mean offset LUT 302 according to some embodiments. Figure 3 The vertical axis of the graph shown illustrates the duty cycle offset (i.e., peak offset and mean offset) and Figure 3 The horizontal axis of the graph shown represents the input duty cycle. (As...) Figure 3 As shown, when the input duty cycle is x, the control circuit 140 can use LUTs 301 and 302 to determine the corresponding peak shift P_shift(x) and mean shift M_shift(x). In this way, the control circuit 140 can determine the peak shift P_shift and mean shift M_shift based on the input duty cycle input to block 147.

[0051] Back Figure 2 In block 148, control circuit 140 is configured to calculate peak duty cycle duty_pk based on input duty cycle x, peak offset P_shift, mean offset M_shift, and weight values ​​w1 and w2. For example, control circuit 140 calculates peak duty cycle duty_pk according to the following equation (6), where x is the input duty cycle; w1 and w2 are weight values; P_shift(x) is the peak offset corresponding to input duty cycle x; and M_shift(x) is the mean offset corresponding to input duty cycle x:

[0052] duty_pk (x) = x+ w1*P_shift (x)+ w2* M_shift (x) (6)

[0053] In an instance where the duty cycle is recorded as an 8-bit value, the maximum recordable value is 255. As shown in equation (6), when the input duty cycle x is large (i.e., 255), the peak duty cycle duty_pk may be greater than 255. Thus, the calculated peak duty cycle duty_pk should be adjusted to be within an acceptable range (i.e., from 0 to 255). In block 149, control circuit 140 is configured to adjust the peak duty cycle and current value to generate output backlight parameter 140_P. Output backlight parameter 140_P may include output duty cycle and current value, which are configured to control the brightness of the light-emitting unit of backlight module 120. In some embodiments, control circuit 140 is configured to determine whether the peak duty cycle duty_pk is greater than a first preset duty cycle. When the 8-bit duty cycle is recorded, the first preset duty cycle may be 255 or 100% of the duty cycle, but the present invention is not intended to limit the first preset duty cycle to any particular value. The first preset work cycle can be set to 90%, 80%, or any other value based on design requirements.

[0054] When it is determined that the peak duty cycle duty_pk is not greater than the first preset duty cycle, the control circuit 140 does not adjust the peak duty cycle duty_pk or the current of the light source applied to the backlight module 120. In this way, the peak duty cycle duty_pk is set as the output duty cycle and the output backlight parameter 140_P, and the current value of the output backlight parameter 140_P remains unchanged.

[0055] When it is determined that the peak duty cycle (duty_pk) is greater than the first preset duty cycle, the control circuit 140 is configured to set the first preset duty cycle as the output duty cycle and output backlight parameter 140_P, and is further configured to adjust the current value based on the difference between the peak duty cycle (duty_pk) and the first preset duty cycle. Generally, when the difference between the peak duty cycle (duty_pk) and the first preset duty cycle is large, the adjustment current is large, and vice versa.

[0056] Figure 4 This is a diagram illustrating the adjustment of the peak duty cycle duty_pk and the current I applied to the light source of the backlight module 120 according to some embodiments. Figure 4 The diagram shown includes lines 401 and 402, where line 401 shows an adjustment to the peak duty cycle (duty_pk), and line 402 shows an adjustment to the current I applied to the light source of the backlight module 120. Figure 4 As shown, when the peak duty cycle (duty_pk) is less than the preset duty cycle, no adjustment is made to the peak duty cycle (duty_pk) or the current. When the peak duty cycle (duty_pk) is greater than the preset duty cycle, the peak duty cycle (duty_pk) is set to 100% of the preset duty cycle, and the current I is adjusted based on the difference between the peak duty cycle (duty_pk) and 100% of the preset duty cycle. Figure 4 Arrow AR2 illustrates the adjustment of current I when the peak duty cycle (duty_pk) is greater than the preset duty cycle. For example, when the peak duty cycle (duty_pk) corresponding to the light source is greater than the preset duty cycle, the current I applied to the backlight module 120 can be adjusted from current value I1 to current value I2. The difference between current value I1 and current value I2 is determined based on the difference between the peak duty cycle (duty_pk) and 100% of the preset duty cycle. Figure 4 The diagram shown further illustrates arrow AR1, which indicates the input duty cycle (i.e., in...). Figure 2 In block 144 shown) and peak duty cycle (i.e., in Figure 2The offset between (as shown in block 148). When the current I and peak duty cycle duty_pk are adjusted in block 148, the output duty cycle in the output backlight parameter 140_P is within the allowable range (i.e., 0 to 255), and the brightness of the light source of the backlight module is controlled to the desired level. The control circuit 140 outputs the output backlight parameter 140_P, including the current value and the output peak duty cycle, to the backlight module 120 to control the light source of the light-emitting unit in the backlight module 120.

[0057] In some embodiments, the control circuit 140 is further configured to determine whether the input duty cycle from the block 144 is less than a second preset duty cycle. When the input duty cycle is less than the second preset duty cycle, the control circuit 140 does not adjust the input duty cycle and directly outputs the input duty cycle as the backlight parameter 140_P. In this way, when the pixels of the block are too dark, the control circuit 140 does not adjust the duty cycle of the light-emitting unit corresponding to the block. Therefore, the contrast of the image displayed on the display panel 110 is improved.

[0058] Figure 5A The histogram of the input duty cycle in backlight parameter 142a is shown; and Figure 5B A histogram of peak duty cycles is shown according to some embodiments. Figure 5A and Figure 5B In this context, the duty cycle x1 indicates a second preset duty cycle, and the control circuit 140 is configured not to adjust the input duty cycle within the range from 0 to x1. In other words, Figure 5A and Figure 5B The duty cycle within the range of 0 to x1 is the same. The input duty cycle within the range of x1 to 255 is used to calculate the peak duty cycle according to equations (1) to (6) above. Figure 5B In the exemplary histogram shown, the peak duty cycle ranges from x1 to 300, which is outside the permissible range of 8-bit values ​​(0 to 255). Figure 5B In this process, the peak duty cycle, ranging from 250 to 300, will be adjusted to a preset duty cycle of 255 (or 100%), and the current applied to the light source will be adjusted to correspond to the peak duty cycle ranging from 250 to 300. Combined with... Figure 4 This document provides a detailed explanation of the adjustment of the peak duty cycle and the current applied to the light source of the backlight module 120.

[0059] Figure 6This is a flowchart illustrating a method applicable to a display device including a backlight module according to some embodiments. In block 610, an input image is divided into multiple blocks, and backlight parameters for each of the blocks are calculated, wherein each backlight parameter corresponds to one of the light-emitting units for controlling the brightness of the corresponding light-emitting unit, and each backlight parameter includes multiple duty cycles. In block 620, a first duty cycle offset and a second duty cycle offset are calculated based on the multiple duty cycles in the backlight parameters of each of the multiple blocks. In block 630, a maximum duty cycle, a minimum duty cycle, and a duty cycle average among the multiple duty cycles are determined. In block 640, a first weight value and a second weight value are calculated based on the maximum duty cycle, the minimum duty cycle, and the duty cycle average. In block 650, a peak duty cycle is calculated based on the multiple duty cycles, the first duty cycle offset, the second duty cycle offset, the first weight value, and the second weight value. In block 660, output backlight parameters are generated based on the peak duty cycle, and the corresponding light-emitting units of the backlight module are driven according to the output backlight parameters.

[0060] In some embodiments, the input image is divided into multiple blocks and backlight parameters for each of the blocks are calculated. The backlight parameters are further adjusted according to weight values, where the weight values ​​may indicate changes in contrast and brightness in the input image. In this way, the backlight parameters are effectively adjusted based on the content of the input image. Furthermore, each of the backlight parameters may further include a current value for controlling the brightness of the backlight module, wherein the current value is adjusted when the peak duty cycle is greater than a preset duty cycle (i.e., 100% duty cycle). In this way, the backlight module is effectively controlled even when the peak duty cycle is greater than 100%.

[0061] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be defined by the claims.

Claims

1. A display device, characterized in that, include: The backlight module includes multiple light-emitting units; The control circuit is configured as follows: The input image is divided into multiple blocks, and the backlight parameters of each of the multiple blocks are calculated. Each of the backlight parameters corresponds to one of the multiple light-emitting units, so as to control the brightness of the corresponding light-emitting unit among the multiple light-emitting units. Each of the backlight parameters includes multiple working cycles. The peak offset and the mean offset are calculated based on the multiple working cycles of the backlight parameters of each of the multiple blocks. The peak offset is determined according to a peak offset lookup table, which records the relationship between the peak offset and the working cycle. The mean offset is determined according to a mean offset lookup table, which records the relationship between the mean offset and the working cycle. Determine the maximum working cycle, the minimum working cycle, and the average working cycle among the plurality of working cycles; The first weight value and the second weight value are calculated based on the maximum working cycle, the minimum working cycle and the average working cycle, and the first weight value is determined based on the difference between the maximum working cycle and the minimum working cycle. The second weight value is determined based on the difference between the average working cycle and the minimum working cycle. The peak working cycle is calculated based on the multiple working cycles, the product of the first weight value and the peak offset, and the product of the second weight value and the mean offset. as well as Output backlight parameters are generated based on the peak duty cycle, wherein the corresponding light-emitting unit of the backlight module is driven according to the output backlight parameters.

2. The display device according to claim 1, characterized in that, The output backlight parameters for each of the plurality of blocks include the output duty cycle and current value. The control circuit is further configured to: Determine whether each of the multiple peak duty cycles is greater than a preset duty cycle; as well as In response to the determination that the peak working cycle among the multiple peak working cycles is greater than the preset working cycle, the preset working cycle is set as the output working cycle and the current value is adjusted to generate an adjusted current value. as well as In response to the determination that the peak duty cycle is less than the preset duty cycle, the peak duty cycle is set as the output duty cycle while keeping the current value unchanged.

3. The display device according to claim 2, characterized in that, The adjustment amount of the current value is determined based on the difference between the peak operating cycle and the preset operating cycle.

4. The display device according to claim 1, characterized in that, The input image includes multiple pixels, and The control circuit determines the backlight parameters corresponding to the multiple light-emitting units based on the grayscale of the multiple pixels.

5. The display device according to claim 1, characterized in that, The control circuit averages the multiple working cycles to obtain the average value of the working cycles.

6. The display device according to claim 1, characterized in that, The control circuit is further configured to: The first weight value is multiplied by the peak offset to generate the first offset value; The second weight value is multiplied by the mean offset to generate the second offset value; as well as The first offset value and the second offset value are added to the backlight parameters to generate the peak duty cycle.

7. The display device according to claim 1, characterized in that, Each of the plurality of light-emitting units includes at least one light-emitting diode, and The output backlight parameters control the brightness of at least one light-emitting diode in the corresponding light-emitting unit.

8. The display device according to claim 1, characterized in that, The control circuit is the timing controller of the display device.

9. A method applicable to a display device including a backlight module, characterized in that, The method includes: The input image is divided into multiple blocks, and the backlight parameters of each of the multiple blocks are calculated. Each of the backlight parameters corresponds to one of the multiple light-emitting units, so as to control the brightness of the corresponding light-emitting unit among the multiple light-emitting units. Each of the backlight parameters includes multiple working cycles. The peak offset and the mean offset are calculated based on the multiple working cycles of the backlight parameters of each of the multiple blocks. The peak offset is determined according to a peak offset lookup table, which records the relationship between the peak offset and the working cycle. The mean offset is determined according to a mean offset lookup table, which records the relationship between the mean offset and the working cycle. Determine the maximum working cycle, the minimum working cycle, and the average working cycle among the plurality of working cycles; Calculating a first weight value and a second weight value based on the maximum working cycle, the minimum working cycle, and the average working cycle includes: calculating the first weight value based on the difference between the maximum working cycle and the minimum working cycle; and calculating the second weight value based on the difference between the average working cycle and the minimum working cycle. The peak working cycle is calculated based on the plurality of working cycles, the product of the first weight value and the peak offset, and the product of the second weight value and the mean offset; and Output backlight parameters are generated based on the peak duty cycle, wherein the corresponding light-emitting unit of the backlight module is driven according to the output backlight parameters.

10. The method according to claim 9, characterized in that, The output backlight parameters of each of the plurality of blocks include the output duty cycle and current value, and Generating the output backlight parameters based on the peak duty cycle includes: Determine whether each of the multiple peak duty cycles is greater than a preset duty cycle; and In response to the determination that the peak duty cycle among the multiple peak duty cycles is greater than the preset duty cycle, the preset duty cycle is set as the output duty cycle and the current value is adjusted to generate an adjusted current value; and In response to the determination that the peak duty cycle is less than the preset duty cycle, the peak duty cycle is set as the output duty cycle while keeping the current value unchanged.

11. The method according to claim 10, characterized in that, The adjustment amount of the current value is determined based on the difference between the peak operating cycle and the preset operating cycle.

12. The method according to claim 9, characterized in that, The input image includes multiple pixels, and The backlight parameters are determined based on the grayscale of the plurality of pixels, corresponding to the plurality of light-emitting units.

13. The method according to claim 9, characterized in that, The multiple work cycles are averaged to obtain the average work cycle value.

14. The method according to claim 9, characterized in that, The calculation of the peak working cycle based on the multiple working cycles, the product of the first weight value and the peak offset, and the product of the second weight value and the mean offset includes: The first weight value is multiplied by the peak offset to generate the first offset value; Multiply the second weight value by the mean offset to produce a second offset value; and The first offset value and the second offset value are added to the backlight parameters to generate the peak duty cycle.

15. The method according to claim 9, characterized in that, Each of the plurality of light-emitting units includes at least one light-emitting diode, and The output backlight parameters control the brightness of at least one light-emitting diode in the corresponding light-emitting unit.

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