TW201935454A - Display device and backlight control method - Google Patents

Abstract

A display device includes a display panel, a backlight unit, a display driving circuit, and a backlight driving circuit. The display panel includes multiple display zones. The backlight unit includes multiple light sources, corresponding to the multiple display zones respectively. The display driving circuit is configured to receive an image signal, and to calculate a local dimming value for each display zone according to the image signal. The image signal includes multiple image frames, and the display driving circuit is configured to drive the display panel to display the multiple image frames sequentially in multiple frame intervals, where each frame interval includes a vertical blanking interval and a data scan interval. The backlight driving circuit is configured to provide a backlight pulse for each light source, and to adjust the width and/or the strength of each backlight pulse according to the local dimming value for each display zone. The backlight driving circuit is configured to provide the backlight pulse in the vertical blanking interval.

Description

Display device and backlight control method

The present invention relates to a display device, and more particularly to a backlight control method for a display device.

Liquid crystal display (LCD) is a commonly used display screen. The liquid crystal panel itself is a passive display. It is necessary to provide a backlight to the liquid crystal panel to display the image. However, it takes a certain amount of time to change the state of the liquid crystal. If the backlight is always provided, the process of the liquid crystal conversion will also be observed by the user, and the phenomenon of afterimage may occur, affecting the viewing quality of the movie. In addition, the liquid crystal display is a hold type display device, that is, for each pixel, the pixel intensity value is maintained at a fixed value until the next image frame is updated to a new intensity value. Because of this characteristic, when displaying continuous image frames, moving objects in the image remain static in one image frame, so motion blur will occur for human vision, reducing image quality and May cause viewing discomfort. Therefore, how to improve the dynamic blurring phenomenon of images of such display devices is one of the topics that the industry is currently working on.

The invention relates to a display device and a backlight control method applied to the display device, which can achieve area dimming and improve the dynamic blur phenomenon of the display device.

According to an embodiment of the present invention, a display device is provided, which includes a display panel, a backlight unit, a display driving circuit, and a backlight driving circuit. The display panel includes a plurality of display areas. The backlight unit includes a plurality of light sources, each corresponding to a plurality of display areas. The display driving circuit is used to receive an image signal and calculate an area dimming value corresponding to each display area according to the image signal. The image signal includes a plurality of image frames, and the display driving circuit sequentially drives the display panel to display multiple image frames. Image frames, each frame interval includes a vertical occlusion interval and a data scanning interval. The backlight driving circuit is configured to provide backlight pulses corresponding to each light source, and adjust the width and / or intensity of each backlight pulse according to the area dimming value corresponding to each display area. The backlight driving circuit provides backlight pulses in the vertical blanking interval.

According to another embodiment of the present invention, a backlight control method for a display device is provided. The display device includes a display panel and a backlight unit. The backlight control method includes the following steps. The display panel is divided into a plurality of display areas, wherein the backlight unit includes a plurality of light sources, and the plurality of display areas respectively correspond to a plurality of light sources. Receives an image signal. The image signal includes a plurality of image frames. Multiple image frames are sequentially displayed on the display panel in multiple frame intervals, and each frame interval includes a vertical masking interval and a data scanning interval. The area dimming value corresponding to each display area is calculated according to the image signal. Backlight pulses are provided for each light source. Backlight pulses are provided in the vertical blanking interval. And adjusting the width and / or intensity of each backlight pulse according to the area dimming value corresponding to each display area.

In order to have a better understanding of the above and other aspects of the present invention, the following specific examples are described in detail below in conjunction with the accompanying drawings:

The transmissive liquid crystal display may include a display panel and a backlight unit. The backlight unit includes a light source to illuminate the front display panel. The light source is, for example, a light-emitting diode (LED) or a cold cathode. Cold Cathode Fluorescent Lamps (CCFL). By controlling the on or off operation of the backlight unit, for example, whether the backlight unit is turned on at a frequency higher than the human eye can detect, so that the liquid crystal pixels are not maintained lit during the complete image frame, which can effectively slow down the dynamics. Vague phenomenon.

FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention. The display device 10 includes a display panel 100, a backlight unit 110, a display driving circuit 120, and a backlight driving circuit 130. The display panel 100 includes a plurality of display areas 105_1 to 105_4. The backlight unit 110 includes a plurality of light sources 115_1 to 115_4, and the plurality of light sources 115_1 to 115_4 correspond to a plurality of display areas 105_1 to 105_4, respectively. The display driving circuit 120 is configured to receive an image signal and calculate an area dimming value corresponding to each of the display areas 105_1 to 105_4 according to the image signal. The backlight driving circuit 130 is configured to provide backlight pulses BL_1 to BL_4 corresponding to each of the light sources 115_1 to 115_4, and adjust the width and / or intensity of each backlight pulse BL_1 to BL_4 according to the area dimming value corresponding to each of the display areas 105_1 to 105_4.

In the first figure, the backlight unit 110 includes four light sources 115_1 ~ 115_4, which can be used to illuminate the four display areas 105_1 ~ 105_4, respectively. Since the corresponding light sources 115_1 ~ 115_4 are set for each display area 105_1 ~ 115_4, area dimming can be achieved That is, different brightness can be displayed in different display areas 105_1 ~ 105_4, and the effect of improving contrast can be achieved. The number of the light sources 115_1 ~ 115_4 and the display area 105_1 ~ 105_4 (the number is indicated by n in the following description) may correspond to each other. The number shown in the example in Figure 1 is 4 (n = 4), but it should be understood It is only an exemplary illustration, and in other embodiments, the numbers of the light source and the display area may be other values.

2A to 2C are schematic diagrams of a display panel divided into a plurality of display regions according to various embodiments of the present invention. In the embodiment shown in FIG. 2A, the display panel 100 is vertically divided into M display regions 105_1 ~ 105_M, and the light sources 115_1 ~ 115_M are disposed on the top side of the display panel 100. M is a positive integer greater than 1, and n = M. In other embodiments, the light sources 115_1 to 115_M can also be disposed on the bottom side of the display panel 100 or both on the top side and the bottom side of the display panel 100, which is not limited herein. FIG. 2A illustrates an example of an upside-down backlight.

In the embodiment shown in FIG. 2B, the display panel 100 is horizontally divided into N display areas 105_1 to 105_N, and the light sources 115_1 to 115_N are disposed on the left side of the display panel 100. N is a positive integer greater than 1, and n = N. In other embodiments, the light sources 115_1 to 115_N can also be disposed on the right side of the display panel 100, or both left and right sides of the display panel 100, which is not limited herein. FIG. 2B illustrates an example of a left-right side-entry backlight.

In the embodiment shown in FIG. 2C, the display panel 100 is divided into (M × N) display areas 105_1 to 105_n by M rows and N columns, for example, is divided into a plurality of rectangular areas arranged in two dimensions, and the display areas 105_1 to 105_n All are rectangular, and the light sources 115_1 ~ 115_n can be respectively set at positions corresponding to the display areas 105_1 ~ 105_n. M and N are both positive integers greater than 1, and n = M × N. FIG. 2C illustrates an example of a direct type backlight.

FIG. 3 is a schematic circuit diagram of a backlight unit and a backlight driving circuit according to an embodiment of the present invention. In this embodiment, each of the light sources 115_1 to 115_n may be a light bar including a plurality of LEDs. The backlight driving circuit 130 may include a microcontroller 131, a plurality of switching elements SW1 to SWn, a pulse width modulation circuit RC1 to RCn, and a current modulation circuit RS1 to RSn. In one embodiment, the microcontroller 131 may also be replaced by a microprocessor or a digital signal processor (DSP). The switching elements SW1 to SWn correspond to the light sources 115_1 to 115_n, respectively. The microcontroller 131 has pins COMP1, COMP2, ..., COMPn, and pins ISET1, ISET2, ..., ISETn, wherein the pins COMP1 and ISET1 can correspond to the channel CH1 and the light source 115_1, and the pins COMP2 and ISET2 can correspond to the channel CH2 and light source 115_2, and so on. The microcontroller 131 can adjust the signal waveform output to the pins COMP1 ~ COMn, control the pulse width modulation circuits RC1 ~ RCn, and change the turn-on time of the switching elements SW1 ~ SWn to change the backlight transmitted to the light sources 115_1 ~ 115_n The width of the pulses BL_1 ~ BL_n. In addition, the microcontroller 131 can adjust the voltage output to the pins ISET1 ~ ISETn to make the potential difference of the current modulation circuits RS1 ~ RSn different, and change the LED drive current of the light sources 115_1 ~ 115_n to change the transmission to the light source 115_1 ~ The intensity of the backlight pulses BL_1 ~ BL_n of 115_n. In one embodiment, the current modulation circuits RS1 to RSn can also be replaced with voltage modulation circuits, and the intensity of the backlight pulses BL_1 to BL_n can be changed by changing the bias voltage of the light sources 115_1 to 115_n. The display driving circuit 120 for receiving an image signal includes, for example, a scalar circuit.

FIG. 4 is a flowchart of a backlight control method according to an embodiment of the present invention. The backlight control method can be applied to the display device 10 shown in FIG. 1. The backlight control method includes the following steps. Step S200: Divide the display panel into multiple display areas, where the backlight unit includes multiple light sources, and the multiple display areas correspond to multiple light sources, respectively. For multiple embodiments of step S200, reference may be made to FIG. 2A to FIG. 2C.

Step S201: Receive an image signal. The image signal includes a plurality of image frames. Step S202: Display a plurality of image frames on the display panel 100 in sequence in a plurality of frame intervals. Each frame interval includes a vertical blanking interval (VBI) and a data scanning interval. Steps S201 and S202 can be performed by the display driving circuit 120. For example, step S202 includes the display driving circuit 120 sequentially driving the display panel 100 to display a plurality of image frames in a plurality of frame intervals.

Step S203: Calculate the area dimming value corresponding to each display area 105_1 ~ 105_n according to the image signal. Step S204: The backlight pulses BL_1 to BL_n are provided corresponding to the light sources 115_1 to 115_n, respectively. Step S205: The backlight pulses BL_1 ~ BL_n are provided in the vertical blanking interval. Step S206: Adjust the width and / or intensity of each backlight pulse BL_1 ~ BL_n according to the area dimming value corresponding to each display area 105_1 ~ 105_n. In an embodiment, the step S203 for calculating the area dimming value may be performed by the display driving circuit 120, and the steps S204 to S206 may be performed by the backlight driving circuit 130. In another embodiment, step S203 may also be performed by the backlight driving circuit 130.

Since the frame interval includes a vertical blanking interval, and the backlight unit is intermittently turned on according to the backlight pulse, the backlight unit does not continuously light up the display panel, which can reduce the dynamic blur phenomenon. In addition, by adjusting the width and / or intensity of the backlight pulse according to the area dimming value corresponding to each display area, the area dimming effect can be achieved and the image contrast can be improved.

There may be various embodiments for calculating the area dimming value in step S203. In one embodiment, the display driving circuit 120 is configured to calculate an average value of the grayscale values of the image signals in each of the display areas 105_1 to 105_n, and calculate the area dimming value according to the average value, for example, for larger pixel grayscales. The average value of the step value sets a larger area dimming value. The display driving circuit 120 may set the area dimming value of the display area 105_1 according to the average value of the pixel gray level values in the display area 105_1, and set the area dimming value of the display area 105_2 according to the average value of the pixel gray level values in the display area 105_2. So on and so forth. In another embodiment, the display driving circuit 120 is configured to calculate an average value, a maximum value, and a minimum value of the pixel grayscale value of the image signal in each display area 105_1 to 105_n, and calculate the average value, the maximum value, and the minimum value. The area dimming value. For example, the display driving circuit 120 may set weights corresponding to the three values of the average value, the maximum value, and the minimum value, and calculate a weighted sum of the three values, thereby calculating Area dimming value.

In an embodiment, step S206 may adjust the width of each backlight pulse BL_1 to BL_n according to the area dimming value corresponding to each display area 105_1 to 105_n, while keeping the intensity of each backlight pulse BL_1 to BL_n the same. FIG. 5 shows a schematic diagram of adjusting the backlight pulse width according to an embodiment of the present invention. In the embodiment shown in FIG. 5, the period during which the image data timing signal DL is enabled is the data scanning period TP1, TP2 The image data can be provided to the display panel 100 during the data scanning period TP1, TP2; the period during which the image data timing signal DL is disabled is the vertical blanking period VB1, VB2, and the backlight driving circuit 130 is during the vertical blanking period VB1, VB2 provides backlight pulses BL_1 ~ BL_4. Each backlight pulse BL_1 ~ BL_4 can have the same pulse intensity (as shown in Figure 5, the waveform height is the same). The backlight driving circuit 130 is used to adjust each backlight pulse according to the area dimming value corresponding to each display area 105_1 ~ 105_4. BL_1 ~ BL_4 width. For example, for a larger area dimming value, a larger backlight pulse width can be given to achieve higher brightness.

In another embodiment, step S206 may adjust the intensity of each of the backlight pulses BL_1 to BL_n according to the area dimming value corresponding to each of the display areas 105_1 to 105_n, while keeping the widths of the backlight pulses BL_1 to BL_n the same. FIG. 6 shows a schematic diagram of adjusting the backlight pulse intensity according to an embodiment of the present invention. Each of the backlight pulses BL_1 ~ BL_4 can have the same pulse width. The backlight driving circuit 130 is used to adjust the area according to the corresponding area of the display areas 105_1 ~ 105_4. Light value, adjust the intensity of each backlight pulse BL_1 ~ BL_4. In Fig. 6, the horizontal dotted lines in the waveforms of each backlight pulse BL_1 ~ BL_4 represent the maximum pulse intensity of the backlight pulse. It can be seen that each backlight pulse BL_1 ~ BL_4 has different intensity, and one backlight pulse has different vertical blanking periods VB1 and VB1. VB2 also has different strengths. For example, for a larger area dimming value, a larger backlight pulse intensity can be given to achieve higher brightness.

Regarding adjusting the backlight pulse intensity as shown in FIG. 6, for an implementation method, refer to FIG. 7, which illustrates a schematic diagram of controlling the turn-on time and driving current of each light source according to an embodiment of the present invention. In the embodiment shown in FIG. 7, the related control signal may further include a vertical synchronization signal Vsync for controlling a display signal driving timing. In an embodiment, the display driving circuit 120 may calculate the area dimming value of each of the display regions 105_1 to 105_4 after confirming that the vertical synchronization signal Vsync is received, and after confirming that the data of the entire image is ready, and then the backlight driving circuit 130 generates backlight pulses BL_1 ~ BL_4 according to the area dimming value. In the embodiment shown in FIG. 7, the backlight driving circuit 130 can control the light source on time L1_W, L2_W, L3_W, and L4_W of each light source to remain the same. The backlight driving circuit 130 is based on the area dimming values of each of the display areas 105_1 to 105_4. Set the light source drive currents L1_I, L2_I, L3_I, and L4_I of each light source. As shown in Figure 7, the light source on time L1_W and the light source driving current L1_I can generate the backlight pulse BL_1 as shown in Figure 6. Similarly, the light source on time L2_W and the light source driving current L2_I can generate the backlight pulse BL_2. And so on. Since in this embodiment, the light source turn-on times L1_W, L2_W, L3_W, and L4_W are the same, the backlight pulses BL_1 ~ BL_4 may have the same duty cycle. That is, in the embodiment shown in FIG. 7, by using a fixed duty cycle and a variable current, it is possible to achieve the effects of both area dimming and reducing motion blur.

In one embodiment, the start time of the backlight pulses BL_1 to BL_4 is the same in each frame interval. The start time of the backlight pulses BL_1 to BL_4 is, for example, the time point of the rising edges of the backlight pulses BL_1 to BL_4. Referring to the embodiment in FIG. 7, each light source on time L1_W, L2_W, L3_W, L4_W and the vertical synchronization signal Vsync may have the same delay amount, and this delay amount remains unchanged in each frame interval, and the light source is turned on. Time can be controlled according to the vertical synchronization signal Vsync. This is merely an exemplary description of an implementation manner. In other embodiments, the start times of the backlight pulses BL_1 to BL_4 may be different in each frame interval.

In step S205, the backlight driving circuit 130 provides backlight pulses in the vertical obscuration interval. There may be various embodiments. FIGS. 8A to 8E illustrate backlight pulse signal waveforms with different timings according to various embodiments of the present invention. In the embodiment shown in FIG. 8A, the width and vertical masking interval VB1 (and VB2 of the backlight pulse BL (which may represent the backlight pulses BL_1 to BL_4 in FIG. 5 and FIG. 6) will not be repeated here. Repeat again) the width is the same. In the embodiment shown in FIG. 8B, the start time and end time of the backlight pulse BL are both within the vertical blanking interval VB1. The end time of the backlight pulse BL is, for example, the time point of the falling edge of the backlight pulse BL. The width of the backlight pulse BL is smaller than the width of the vertical blanking interval VB1. In the embodiment shown in FIG. 8C, the start time of the backlight pulse BL is located outside the vertical blanking interval VB1, and the end time of the backlight pulse BL is located within the vertical blanking interval VB1. In the embodiment shown in FIG. 8D, the start time and end time of the backlight pulse BL are outside the vertical blanking interval VB1, and the width of the backlight pulse BL is larger than the width of the vertical blanking interval VB1. In the embodiment shown in FIG. 8E, the start time of the backlight pulse BL is located within the vertical blanking interval VB1, and the end time of the backlight pulse BL is located outside the vertical blanking interval VB1. In the embodiments shown in FIGS. 8C to 8E, the enabling period of the backlight pulse BL may partially overlap the data scanning period TP1. The backlight driving circuit 130 can control the backlight pulse BL as in the embodiments shown in FIGS. 8A to 8E. In these embodiments, the enabling period of the backlight pulse BL and the vertical blanking interval VB1 at least partially overlap with each other. Achieve the effect of reducing motion blur.

According to the display devices and backlight control methods of the above-mentioned embodiments, the purpose of area dimming can be achieved by setting corresponding light sources in multiple display areas and calculating the dimming value of each display area based on image data. For example, a brighter backlight is provided for high-brightness display areas to enhance image contrast. In addition, the width and / or intensity of the backlight pulse can be adjusted according to the area dimming value, and the turn-on time and driving intensity of the backlight unit can be appropriately arranged. Therefore, the dynamic blur phenomenon can be reduced while achieving the area dimming effect. The above-mentioned embodiments can be applied to the dimming of a multi-zone up-down side-entry, left-right side-entry, and direct-down backlight unit, and are applicable to personal computers, notebook computers, tablet devices, televisions, projectors, and the like. The field of display electronic products has a wide range of applications.

In summary, although the present invention has been disclosed as above with the embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention pertains can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

10‧‧‧ display device

100‧‧‧ display panel

105_1 ~ 105_4, 105_M, 105_N, 105_n‧‧‧ Display area

110‧‧‧ backlight unit

115_1 ~ 115_4, 115_M, 115_N, 115_n‧‧‧

120‧‧‧Display driving circuit

130‧‧‧ backlight driver circuit

131‧‧‧Microcontroller

S200 ~ S206‧‧‧step

BL, BL_1 ~ BL_4, BL_n‧‧‧Backlight pulse

CH1, CH2, CHn‧‧‧ channels

COMP1, COMP2, COMPn, ISET1, ISET2, ISETn‧‧‧ pins

DL‧‧‧Image data timing signal

L1_I, L2_I, L3_I, L4_I‧‧‧ Light source drive current

L1_W, L2_W, L3_W, L4_W‧‧‧ Light source on time

SW1 ~ SWn‧‧‧Switching element

RC1 ~ RCn‧‧‧pulse width modulation circuit

RS1 ~ RSn‧‧‧Current modulation circuit

TP1, TP2‧‧‧ Data scanning interval

VB1, VB2 ‧‧‧ vertical masking interval

Vsync‧‧‧Vertical Sync Signal

FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention. 2A to 2C are schematic diagrams of a display panel divided into a plurality of display regions according to various embodiments of the present invention. FIG. 3 is a schematic circuit diagram of a backlight unit and a backlight driving circuit according to an embodiment of the present invention. FIG. 4 is a flowchart of a backlight control method according to an embodiment of the invention. FIG. 5 is a schematic diagram of adjusting a backlight pulse width according to an embodiment of the present invention. FIG. 6 is a schematic diagram of adjusting a backlight pulse intensity according to an embodiment of the present invention. FIG. 7 is a schematic diagram of controlling the turn-on time and driving current of each light source according to an embodiment of the present invention. 8A to 8E are waveform diagrams of backlight pulse signals having different timings according to various embodiments of the present invention.

Claims (15)

A display device includes: a display panel including a plurality of display areas; a backlight unit including a plurality of light sources, wherein the light sources correspond to the display areas; a display driving circuit for receiving an image signal, and The image signal calculates an area dimming value corresponding to each of the display areas. The image signal includes a plurality of image frames, and the display driving circuit sequentially drives the display panel to display the image frames in a plurality of frame intervals. Each frame interval includes a vertical blanking interval and a data scanning interval; and a backlight driving circuit for providing a backlight pulse corresponding to each of the light sources, and according to the area dimming value corresponding to each of the display areas, The width and / or intensity of each of the backlight pulses is adjusted, wherein the backlight driving circuit provides the backlight pulses in the vertical blanking interval. The display device according to item 1 of the scope of patent application, wherein the width of each backlight pulse is the same, and the backlight driving circuit is used to adjust the intensity of each backlight pulse according to the area dimming value corresponding to each of the display areas; Alternatively, the intensity of each of the backlight pulses is the same, and the backlight driving circuit is configured to adjust the width of each of the backlight pulses according to the area dimming value corresponding to each of the display areas. The display device according to item 1 of the scope of patent application, wherein the width of the backlight pulse is the same as the width of the vertical masking interval; or the width of the backlight pulse is smaller than the width of the vertical masking interval. The display device according to item 1 of the scope of patent application, wherein one of a start time and an end time of the backlight pulse is located outside the vertical blanking interval; or, the start time and the end of the backlight pulse Time lies outside this vertical obscuration interval. The display device according to item 1 of the scope of patent application, wherein the display panel is vertically divided into M display areas, and the light sources are disposed on at least one of the top and bottom sides of the display panel, where M is greater than A positive integer of 1; or the display panel is horizontally divided into N display areas, and the light sources are disposed on at least one of the left and right sides of the display panel, and N is a positive integer greater than 1. The display device according to item 1 of the scope of patent application, wherein the display panel is divided into (M × N) display areas by M rows and N columns, the display areas are rectangular, and the light sources are arranged correspondingly. The position of the display area, M and N are both positive integers greater than 1. The display device according to item 1 of the scope of patent application, wherein the display driving circuit is configured to calculate an average value of a plurality of pixel grayscale values of the image signal in each of the display areas, and calculate the area adjustment according to the average value. Light value; or, the display driving circuit is configured to calculate the average value, a maximum value, and a minimum value of the grayscale values of the plurality of pixels in each display area of the image signal, and according to the average value and the maximum value , And the minimum value to calculate the area dimming value. The display device according to item 1 of the patent application scope, wherein the backlight driving circuit comprises: a pulse width modulation circuit for adjusting the width of the backlight pulse; and a current modulation circuit for adjusting the backlight The intensity of the pulse. A backlight control method for a display device. The display device includes a display panel and a backlight unit. The backlight control method includes: dividing the display panel into a plurality of display areas. The backlight unit includes a plurality of light sources. The display area corresponds to these light sources respectively; receiving an image signal, the image signal includes a plurality of image frames; sequentially displaying the image frames on the display panel in a plurality of frame intervals, each frame interval including a vertical A masking interval and a data scanning interval; calculating an area dimming value corresponding to each of the display areas according to the image signal; providing a backlight pulse corresponding to each of the light sources; providing the backlight pulse in the vertical masking interval; and according to The area dimming value corresponding to each of the display areas adjusts the width and / or intensity of each of the backlight pulses. The backlight control method according to item 9 of the scope of patent application, wherein the width of each backlight pulse is the same, and the intensity of each backlight pulse is adjusted according to the dimming value of the area corresponding to each display area; or each of the backlight pulses The intensity of the backlight pulses is the same, and the widths of the backlight pulses are adjusted according to the dimming value of the area corresponding to each of the display areas. The backlight control method according to item 9 of the scope of the patent application, wherein the width of the backlight pulse is the same as the width of the vertical masking interval; or the width of the backlight pulse is smaller than the width of the vertical masking interval. The backlight control method according to item 9 of the scope of patent application, wherein one of a start time and an end time of the backlight pulse is outside the vertical blanking interval; the start time and the end time of the backlight pulse They are all located outside the vertical obscuration interval. The backlight control method according to item 9 of the scope of patent application, wherein the step of dividing the display panel into the display areas includes: vertically dividing the display panel into M of the display areas, wherein the light sources are disposed at At least one of the top and bottom sides of the display panel, M is a positive integer greater than 1; or the display panel is horizontally divided into N display areas, where the light sources are disposed on the display panel. On at least one of the left and right sides, N is a positive integer greater than 1. The backlight control method according to item 9 of the scope of patent application, wherein the step of dividing the display panel into the display regions includes: dividing the display panel into M rows and N columns into (M × N) display regions The display areas are rectangular, and the light sources are disposed at positions corresponding to the display areas, and M and N are both positive integers greater than 1. The backlight control method according to item 9 of the scope of patent application, wherein the step of calculating the dimming value of the area corresponding to each of the display areas comprises: calculating an average of the grayscale values of the plurality of pixels in each of the display areas of the image signal Value, and calculate the area dimming value according to the average value; or calculate the average value, a maximum value, and a minimum value of the grayscale value of a plurality of pixels in each of the display areas of the image signal, and according to the average value , The maximum value, and the minimum value to calculate the area dimming value.