Display device, brightness adjusting method and electronic equipment

Abstract

The invention discloses a display device, a brightness adjusting method and electronic equipment. The display device includes a backlight unit including a plurality of groups of backlight partitions; the backlight driver is connected with the backlight unit and is configured to control the brightness of the multiple groups of backlight partitions according to the backlight local area control signals of the multiple groups of backlight partitions; the controller is connected with the backlight driver and is configured to sequentially generate a plurality of groups of backlight data according to a frame of image to be displayed, the plurality of groups of backlight data are different, and each group of backlight data comprises the backlight local area control signals of the grouped backlight subareas in the plurality of groups of backlight subareas; and sequentially providing the plurality of groups of backlight data to the backlight driver within a frame time. The display device can reduce the time delay of backlight refreshing and display picture refreshing.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a display device, a brightness adjustment method, and an electronic device. Background Art

[0002] Local Dimming is a display technology. The basic principle is to control the brightness of the backlight behind the liquid crystal backlight to achieve brightness adjustment in specific areas on the screen.

[0003] The local dimming technology divides the backlight into multiple areas, and each area can independently adjust the brightness to achieve brightness control in specific areas on the screen. For example, when the display screen needs to display deep black, the local dimming technology can reduce the brightness or even turn off the backlight in that area, thereby improving the black performance and contrast. Summary of the Invention

[0004] At least one embodiment of the present disclosure provides a display device, including: a backlight unit including multiple groups of backlight partitions; a backlight driver connected to the backlight unit and configured to control the brightness of the multiple groups of backlight partitions according to the respective backlight local control signals of the multiple groups of backlight partitions; and a controller connected to the backlight driver and configured to: generate multiple groups of backlight data according to a frame of image to be displayed, the multiple groups of backlight data are different, and each group of backlight data includes the backlight local control signals of some groups of backlight partitions in the multiple groups of backlight partitions; and sequentially provide the multiple groups of backlight data to the backlight driver within one frame time.

[0005] For example, in the display device provided in some embodiments of the present disclosure, the multiple groups of backlight data are different from each other, and the multiple groups of backlight data respectively include the backlight local control signals of different backlight partition groups in the multiple groups of backlight partitions.

[0006] For example, in the display device provided in some embodiments of the present disclosure, each group of backlight data includes a data signal, the data signal includes a header and the backlight local control signal, and the header is used to indicate the target backlight partition group in the multiple groups of backlight partitions to which the backlight local control signal included in the data signal belongs, and the headers of the multiple groups of backlight data are different from each other.

[0007] For example, in the display device provided in some embodiments of the present disclosure, the data signal further includes a command, and the command is used to indicate whether the data signal includes the backlight local control signal.

[0008] For example, in the display device provided in some embodiments of the present disclosure, the controller is connected to the backlight driver in a peripheral interface manner, and the multiple groups of backlight data are transmitted through the peripheral interface.

[0009] For example, in the display device provided in some embodiments of the present disclosure, the display device further includes a display panel, and the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty ratio of the cathode or anode of the backlight unit is switched from the first frame to the second frame is less than 1.23 times the time length of one frame.

[0010] For example, in the display device provided in some embodiments of the present disclosure, the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty ratio of the cathode or anode of the backlight unit is switched from the first frame to the second frame is less than or equal to 0.55 times the time length of one frame.

[0011] For example, in the display device provided in some embodiments of the present disclosure, the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty ratio of the cathode or anode of the backlight unit is switched from the first frame to the second frame is 0.35 to 0.55 times the time length of one frame.

[0012] For example, in the display device provided in some embodiments of the present disclosure, the backlight unit includes M groups of backlight partitions, and the controller is configured to: within one frame time, sequentially provide N groups of backlight data to the backlight driver, where M is a positive integer greater than or equal to 2, and 2 ≤ N ≤ M.

[0013] For example, in the display device provided in some embodiments of the present disclosure, M is a positive integer greater than or equal to 3, N < M, the data volume of the Nth group of backlight data is greater than the data volume of each of the other groups, and the Nth group of backlight data is the last group of backlight data within the one frame time.

[0014] For example, in the display device provided in some embodiments of the present disclosure, N = M - 1.

[0015] For example, in the display device provided in some embodiments of the present disclosure, N = M - P, and the data volume of the Nth group of backlight data is (P + 1) times the data volume of each of the other groups.

[0016] For example, in the display device provided in some embodiments of the present disclosure, the starting point of one frame time is the starting point when the display panel receives one frame of display data, and the ending point of one frame time is the starting point when the display panel receives the next frame of display data.

[0017] For example, in the display device provided in some embodiments of the present disclosure, the backlight unit includes M groups of backlight partitions, and the controller is configured to: starting from the moment when the backlight data of the (K + 1)-th group of backlight partitions in the M groups of backlight partitions is generated, within one frame time, sequentially provide the multiple groups of backlight data to the backlight driver, where M is a positive integer greater than or equal to 2, and K is a positive integer greater than 0 and less than (M - 1).

[0018] For example, in the display device provided in some embodiments of the present disclosure, the backlight data of the first group of backlight partitions to the (M - K)-th group of backlight partitions are respectively used as one group of backlight data; and the backlight data of each of the backlight partitions from the (M - K + 1)-th group of backlight partitions to the M-th group of backlight partitions are combined into one group of backlight data.

[0019] For example, in the display device provided in some embodiments of the present disclosure, the controller is configured to provide the backlight data of the i-th group of backlight partitions to the backlight driver while obtaining the backlight local control signal of the (i + K + 1)-th group of backlight partitions, so that the backlight driver drives the i-th group of backlight partitions, where i is a positive integer less than M - K + 1.

[0020] For example, in the display device provided in some embodiments of the present disclosure, K = 2.

[0021] For example, in the display device provided in some embodiments of the present disclosure, the controller is further configured to provide a synchronization signal to the backlight driver, where the synchronization signal is used to indicate that the controller starts to transmit the backlight data, and the synchronization signal includes M effective pulse widths in each frame.

[0022] For example, in the display device provided in some embodiments of the present disclosure, the controller provides the backlight data to the backlight driver at the active edge of each synchronization signal.

[0023] For example, in the display device provided in some embodiments of the present disclosure, the backlight driver includes: a micro control unit and a storage unit, the storage unit is used to store the backlight drive signals of the multiple backlight partitions respectively, and the micro control unit is configured to: receive each group of backlight data provided by the controller; determine the target backlight partition to which the backlight local control signal in each group of backlight data belongs according to the header; obtain the global backlight drive signal; determine the target backlight drive signal of the target backlight partition based on the global backlight drive signal and the backlight local control signal; and update the target backlight drive signal to the data address corresponding to the target backlight partition in the storage unit.

[0024] For example, in the display device provided in some embodiments of the present disclosure, the backlight driver further includes a backlight driving chip. The backlight unit includes M groups of backlight partitions. The micro-control unit is further configured to receive a synchronization signal provided by the controller and directly provide the synchronization signal to the backlight driving chip. Wherein, the synchronization signal includes M effective pulse widths in each frame, and the effective pulse width of the synchronization signal indicates the backlight data transmission. The micro-control unit is further configured to provide the plurality of backlight driving signals stored in the storage unit to the plurality of backlight driving chips at the effective edge of the synchronization signal in response to the target backlight driving signal being updated to the data address.

[0025] For example, in the display device provided in some embodiments of the present disclosure, the micro-control unit is further configured to: determine whether the duration of the update value is greater than or equal to a preset threshold in response to the global backlight driving signal changing to an update value; and re-determine the target backlight driving signal based on the update value and the backlight local control signal in response to the duration of the update value being greater than or equal to the preset threshold.

[0026] For example, in the display device provided in some embodiments of the present disclosure, the micro-control unit is configured to receive each group of backlight data through direct memory access.

[0027] For example, in the display device provided in some embodiments of the present disclosure, each group of backlight data further includes: a chip select signal transmitted by a chip select signal line, the backlight data is written into a receiving register, and at the rising edge of the chip select signal, the backlight data in the receiving register is written into a storage register and the receiving register is cleared.

[0028] For example, in the display device provided in some embodiments of the present disclosure, the global backlight driving signal is used to indicate the global duty ratio of multiple groups of backlight partitions.

[0029] For example, in the display device provided in some embodiments of the present disclosure, the backlight local control signal is used to indicate the local duty ratio of some of the multiple groups of backlight partitions.

[0030] For example, in the display device provided in some embodiments of the present disclosure, the backlight unit includes light-emitting diodes arranged in an array, and each row of light-emitting diodes is used as one group of the multiple groups of backlight partitions.

[0031] For example, in the display device provided in some embodiments of the present disclosure, the display panel is coupled to the backlight unit, and the backlight unit is configured to provide a planar light source for the display of the display panel.

[0032] At least one embodiment of the present disclosure further provides a method for adjusting the brightness of a backlight unit, where the backlight unit includes multiple groups of backlight partitions, and the method includes: generating multiple groups of backlight data in sequence according to a frame of image to be displayed, the multiple groups of backlight data being different, and each group of backlight data including local backlight control signals of some of the multiple groups of backlight partitions; and within one frame time, sequentially providing the multiple groups of backlight data to a backlight driver, and the backlight driver controls the brightness of the multiple groups of backlight partitions according to the local backlight control signals of the multiple groups of backlight data respectively.

[0033] For example, in the adjustment method provided in some embodiments of the present disclosure, within one frame time, sequentially providing the multiple groups of backlight data to the backlight driver includes: starting from generating the local backlight control signal of the (K + 1)-th group of backlight partitions among the M groups of backlight partitions, and within one frame time, sequentially providing the multiple groups of backlight data to the backlight driver, where M is a positive integer greater than or equal to 2, and K is a positive integer greater than 0 and less than (M - 1).

[0034] For example, in the adjustment method provided in some embodiments of the present disclosure, starting from generating the local backlight control signal of the (K + 1)-th group of backlight partitions among the M groups of backlight partitions, and within one frame time, sequentially providing the multiple groups of backlight data to the backlight driver includes: while obtaining the local backlight control signal of the (i + K)-th group of backlight partitions, providing the backlight data of the i-th group of backlight partitions to the backlight driver, where i is a positive integer less than M - K + 1.

[0035] For example, in the adjustment method provided in some embodiments of the present disclosure, the multiple groups of backlight data respectively include the local backlight control signals of different groups of backlight partitions among the multiple groups of backlight partitions.

[0036] For example, in the adjustment method provided in some embodiments of the present disclosure, each group of backlight data includes a data signal, the data signal including a header and the local backlight control signal, and the header is used to indicate the target group of backlight partitions among the multiple groups of backlight partitions to which the local backlight control signal included in the data signal belongs, and the headers of the multiple groups of backlight data are different from each other.

[0037] At least one embodiment of the present disclosure further provides an electronic device, including: a display device provided in any embodiment of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the accompanying drawings of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present disclosure and do not limit the present disclosure.

[0039] Figure 1A It is a schematic diagram of a backlight unit;

[0040] Figure 1B Schematic diagram of a display device provided by at least one embodiment of the present disclosure;

[0041] Figure 1C A kind provided by at least one embodiment of the present disclosure Figure 1B Exemplary system structure diagram of the display device shown;

[0042] Figure 2 Schematic diagram of SPI signals provided by full-frame SPI provided by at least one embodiment of the present disclosure;

[0043] Figures 3A - 3G Schematic diagram of multiple data packets provided to a backlight driver provided by at least one embodiment of the present disclosure;

[0044] Figure 4 Schematic diagram of the delay time of the backlight partition provided by an embodiment of the present disclosure;

[0045] Figure 5A Flowchart of a method for calculating the brightness control signal of each backlight partition provided by at least one embodiment of the present disclosure;

[0046] Figure 5B Flowchart of a method for updating the PWM value provided by at least one embodiment of the present disclosure;

[0047] Figure 6A Signal timing diagram showing that a controller sends backlight data after generating backlight data for all backlight partitions;

[0048] Figure 6B Signal timing diagram of generating and sending by the controller provided by at least one embodiment of the present disclosure; and

[0049] Figure 7 Flowchart of a method for adjusting the brightness of a backlight unit provided by some embodiments of the present disclosure. Detailed implementation manners

[0050] To make the objectives, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0051] Unless otherwise defined, technical terms or scientific terms used in this disclosure shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second" and similar words used in this disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a", "an" or "the" do not denote a quantity limitation, but mean that there is at least one. Words such as "comprising" or "including" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Words such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0052] The following describes this disclosure through several specific embodiments. To keep the following description of the embodiments of this disclosure clear and concise, detailed descriptions of known functions and known components may be omitted. When any component of the embodiments of this disclosure appears in more than one drawing, the component is denoted by the same or similar reference numeral in each drawing.

[0053] A liquid crystal panel generally includes an array substrate and a counter substrate (such as a color filter substrate) that are disposed opposite to each other to form a liquid crystal cell, and a liquid crystal layer is filled between the array substrate and the counter substrate in the liquid crystal cell; a first polarizer is disposed on the array substrate, and a second polarizer is disposed on the counter substrate, and the polarization directions of the first polarizer and the second polarizer are perpendicular to each other. A backlight unit is disposed on the non-display side of the liquid crystal panel and is used to provide a planar light source for the display of the liquid crystal panel. Under the action of a driving electric field formed between a pixel electrode disposed on the array substrate and a common electrode disposed on the array substrate or a common electrode disposed on the counter substrate, the liquid crystal molecules of the liquid crystal layer are twisted, thereby controlling the polarization direction of the light passing through the liquid crystal layer, and controlling the light transmittance in cooperation with the first polarizer and the second polarizer, thereby achieving grayscale display.

[0054] The backlight unit may be a direct-lit backlight unit or a side-lit backlight unit. A direct-lit backlight unit includes a plurality of juxtaposed point light sources (such as light-emitting diodes (LEDs)) and a diffusion plate. After the light emitted by these point light sources is homogenized by the diffusion plate, it is then incident into the liquid crystal panel for display.

[0055] Currently, for example, high-resolution liquid crystal panels are also gradually applied in VR devices. During the use of VR devices, since the distance between the human eye and the display screen is relatively close, it is easier to perceive the display effect of the displayed image. Therefore, the requirements for the resolution and display image quality of the panel are also getting higher and higher.

[0056] For example, for a liquid crystal panel, the direct - lit backlight unit can be controlled by local dimming technology (LD), thereby improving the display image quality of the panel. The local dimming technology can not only reduce the power consumption of the panel, but also achieve dynamic dimming of the backlight area, greatly improving the contrast of the displayed image and enhancing the display image quality of the panel.

[0057] The local dimming technology can divide the entire backlight unit into multiple separately - drivable backlight blocks. Each backlight block includes one or more LEDs. The drive current of the LEDs in the backlight blocks corresponding to different parts of the display screen is automatically adjusted according to the gray levels to be displayed in these parts, realizing independent adjustment of the brightness of each block in the backlight unit, thereby improving the contrast of the display screen.

[0058] It can be understood that the liquid crystal panel is a type of display panel.

[0059] For example, in an exemplary direct - lit backlight unit, the schematic diagram of the area division of the LED light sources in the entire backplane is as Figure 1A shown. The small squares in the figure represent an LED unit, and the multiple areas separated by dotted lines represent multiple backlight blocks. Each backlight block includes one or more LED units and can be controlled independently of other backlight blocks. For example, the multiple LEDs within each backlight block are linked, that is, the current passing through the multiple LEDs in the same backlight block is the same, so the emission brightness is basically the same. Pulse - width modulation technology (PWM) obtains the required waveform equivalently by modulating the width of a series of pulses. PWM is a method of digitally encoding the level of an analog signal. By using a high - resolution counter, the duty cycle of the square wave is modulated to encode the level of a specific analog signal. For example, the brightness of the LED is controlled by adjusting the duty cycle within one period of PWM. By changing the proportion of the high and low levels within one period, the brightness (intensity) of the LED is controlled. For example, within one period, the larger the proportion of the low level, the brighter the emission intensity.

[0060] With the development of local dimming technology, due to the increase in the number of backlight blocks and the need for fine control, the processing time of the dimming algorithm becomes longer, resulting in a longer refresh delay between the backlight and the display screen, affecting the display effect of the screen and causing phenomena such as screen flashing.

[0061] At least one embodiment of the present disclosure provides a display device. The display device includes a backlight unit, a backlight driver, and a controller. The backlight unit includes multiple groups of backlight partitions. For example, the display device can be a liquid crystal display or a liquid crystal display module. For example, the basic components of a liquid crystal display module include a liquid crystal display screen and its driving circuit system, a backlight source (also known as a "backlight unit") and its driving circuit in four parts. The display screen cut from the cell assembly process without attaching a polarizer and binding and connecting the driving circuit components is called a bare liquid crystal cell, and the display screen with a polarizer attached and binding and connecting the driving circuit components is called an Open Cell (OC). The OC, the backlight source, and its driving circuit are combined to form a liquid crystal display module. The driving circuit of the backlight source includes, for example, the above-mentioned backlight driver and controller. The multiple groups of backlight partitions can be driven separately, and each group of backlight partitions includes one or more LEDs.

[0062] The backlight driver is connected to the backlight unit and is configured to control the brightness of the multiple groups of backlight partitions according to the respective local backlight control signals of the multiple groups of backlight partitions. The controller is connected to the backlight driver and is configured to generate multiple groups of backlight data according to a frame of image to be displayed. The multiple groups of backlight data are different, and each group of backlight data includes the local backlight control signals of some groups of backlight partitions among the multiple groups of backlight partitions, and sequentially provide the multiple groups of backlight data to the backlight driver within one frame time.

[0063] In some embodiments of the present disclosure, for example, the backlight unit includes backlights arranged in an array (for example, 8 rows and 8 columns), and the backlights in the same row are used as a group of backlight partitions. Figure 1B The schematic diagram of a display device provided by at least one embodiment of the present disclosure is shown.

[0064] As Figure 1B shown, the display device 100 includes a backlight unit 101, a backlight driver 102, and a controller 103.

[0065] The backlight unit 101 includes multiple groups of backlight partitions. The backlight driver 102 is connected to the backlight unit 101 and is configured to control the brightness of the multiple groups of backlight partitions according to the respective local backlight control signals of the multiple groups of backlight partitions. The controller 103 is connected to the backlight driver 102 and is configured to sequentially generate multiple groups of backlight data according to a frame of image to be displayed. The multiple groups of backlight data are different, and each group of backlight data includes the local backlight control signals of some groups of backlight partitions among the multiple groups of backlight partitions, and within one frame time, sequentially provide the multiple groups of backlight data to the backlight driver. The following will describe the backlight unit 101, the backlight driver 102, and the controller 103 in conjunction with Figure 1C to describe the backlight unit 101, the backlight driver 102, and the controller 103.

[0066] Figure 1C For at least one embodiment provided by the present disclosureFigure 1B Exemplary system structure diagram of the display device 100 shown. For example, the display device 100 is implemented in the form of a hardware circuit in this example. As Figure 1C shown, the system structure includes, for example, a DC power supply 10, a first control device 11, a second control device 12, and an LED driving circuit board 13 for driving the LEDs to emit light. The first control device 11 can be, for example, a Timing Controller (TCON) and / or a System on Chip (SOC). For example, in Figure 1B the example, a System on Chip is used as the first control device 11. The second control device 12 can include, for example, at least one of a Field-Programmable Gate Array (FPGA), an SOC, and a TCON. The LED driving circuit board 13 is an example of the above-mentioned backlight driver 102.

[0067] As Figure 1C shown, the LED driving circuit board 13 is connected to the backlight unit, and the backlight unit includes LEDs of each backlight zone.

[0068] In some examples of the present disclosure, the LED driving circuit board 13 can include a Micro-chip Unit (MCU) 131, an LED integrated circuit driving chip 132, a DC / DC circuit 133, and a current sampling circuit 134. For example, the LED driving circuit board 13 is configured to process each frame of image signal to obtain the processed backlight brightness data of each backlight zone, and generate driving currents for different backlight zones based on the backlight brightness data, and output these driving currents to the corresponding backlight zones to control the LEDs in these backlight zones to emit light through current, that is, to control the brightness of M groups of backlight zones through current.

[0069] In some embodiments of the present disclosure, for example Figure 1C the second control device 12 in is used as the controller 103, and the controller 103 is electrically connected to the LED driving circuit board 13.

[0070] The MCU 131 receives the local dimming control signal (Local Dimming SPI (Serial Peripheral Interface)) from the second control device 12, and performs an "AND" operation with the brightness modulation signal (PMW) from the first control device 11 (the "AND" operation is controlled by an enable signal (BL_EN)) to obtain the brightness control signals for each backlight zone. Then, the MCU 131 outputs these brightness control signals to the LED integrated circuit driver chip 132 to achieve current control of the LEDs in each backlight zone, thereby controlling the light emission brightness of each backlight zone. For example, the second control device 12 and the first control device 11 can be implemented using a single TCON. For example, both the local dimming control signal and the brightness modulation signal can be implemented by the TCON. The embodiments of the present disclosure are not limited thereto.

[0071] In some embodiments of the present disclosure, the backlight driver 102 and the controller 103 can be integrally provided. That is, the backlight driver 102 and the controller 103 can be different modules of the same integrated circuit, and the backlight driver 102 and the controller 103 are communicatively connected.

[0072] In some embodiments of the present disclosure, the local dimming control signal is used to indicate the local duty ratio of some of the multiple groups of backlight zones. The brightness modulation signal serves as a global backlight drive signal, and the global backlight drive signal is used to indicate the global duty ratio of the multiple groups of backlight zones. For example, it is a PWM signal provided by a system on a chip (SOC).

[0073] In some embodiments of the present disclosure, for example, the backlight unit includes M groups of backlight zones. The controller, such as the second control device 12, is configured to sequentially generate multiple groups of backlight data according to a frame of image to be displayed. Each group of backlight data includes the local dimming control signals for some of the groups of backlight zones, and starting from generating the local dimming control signals for the (K + 1)-th group of backlight zones among the M groups of backlight zones, within one frame time, sequentially provide multiple groups of backlight data to the backlight driver. M is a positive integer greater than or equal to 2, and K is a non-negative integer greater than or equal to 0 and less than (M - 1). In this embodiment, the backlight data is provided to the backlight driver starting from the (K + 1)-th group, without the need to obtain the local dimming control signals for all backlight zones, reducing the delay between backlight refresh and display screen refresh.

[0074] For example, starting from generating the local dimming control signals for the 3rd group of backlight zones, the controller sequentially provides multiple groups of backlight data to the LED driver circuit board 13.

[0075] For example, first, based on the image data of the first and second groups of partitions, local backlight control signals for the first and second groups of partitions are calculated through spatial and temporal filtering. After the calculation of the first two groups of data is completed, starting from the third group, the first group of backlight data is sent via SPI. While sending the first group of backlight data, the backlight data and spatial-temporal filtering for the third group are calculated. After the calculation is completed, starting from the fourth group, the data of the second group is sent via SPI, and so on.

[0076] It should be noted that although in the above embodiment, the controller starts calculating and sending from the third group, this does not limit the present disclosure. For example, it can also be that the controller starts calculating and sending from the second group. That is, first, based on the image data of the first group of partitions, the local backlight control signal for the first group is calculated. After the calculation of the first group of data is completed, starting from the second group, the first group of backlight data is sent via SPI. While sending the first group of backlight data, the backlight data and spatial-temporal filtering for the second group are calculated. After the calculation is completed, starting from the third group, the data of the second group is sent via SPI, and so on. Those skilled in the art can also set the controller to start calculating and sending from the fourth group. The present disclosure does not limit from which group the controller starts calculating and sending.

[0077] After the controller obtains at least the local backlight control signals for the first and second groups of partitions, the first group of backlight data is sent, so that the local backlight control signals for the first and second groups of partitions can be comprehensively considered, reducing the influence of the local backlight control signal of the second group on the local backlight control signal of the first group.

[0078] For example, this local dimming driving system is powered by an external DC power supply 10, and the supply voltage Vin is generally 24 volts (V). For example, this DC / DC circuit 133 can use a voltage conversion circuit (such as a Boost boost circuit) to boost the supply voltage Vin to the driving voltage required to light the LEDs of each backlight partition.

[0079] Since a very small fluctuation in the operating voltage across the LED will cause a large change in the current through the LED, the LEDs in this system can be dimmed using a constant current control method. To achieve constant current control, the cathodes (LED-) of multiple LEDs connected in series in the backlight zones are connected to the current sampling circuit 134 to monitor in real time the stability of the current through the driven LEDs. The current sampling circuit 134 converts the current flowing through the LEDs into a voltage signal and feeds it back to the LED integrated circuit driver chip 132, which then feeds it back to the DC / DC circuit 133. After receiving the control signal, the DC / DC circuit 133 adjusts the output voltage applied to the anodes (LED+) of the LEDs to achieve a constant current function for the LEDs. For example, the converted voltage signal is sampled and compared with a preset reference voltage. When the sampled voltage is higher than the reference voltage, the current sampling circuit 134 outputs a control signal to cause the DC / DC circuit 133 to reduce the output voltage, thereby reducing the current flowing through the LEDs; conversely, the current sampling circuit 134 outputs another control signal to cause the DC / DC circuit 133 to increase the output voltage to increase the current flowing through the LEDs. That is, the circuit sampling circuit 134 can act as a negative feedback circuit to achieve constant current control of the LEDs, enabling the LEDs to operate stably.

[0080] It should be noted that in some embodiments of the present disclosure, the number of multiple sets of backlight data and the number of multiple sets of backlight zones may be the same or different. For example, the backlight data of two backlight zones can be combined into one set of backlight data.

[0081] In some embodiments of the present disclosure, multiple sets of backlight data are different from each other, and the multiple sets of backlight data respectively include the local backlight control signals of different backlight zone groups in the multiple sets of backlight zones. For example, the multiple sets of backlight data and the local backlight control signals of the multiple sets of backlight zones are in one-to-one correspondence. For example, the first set of backlight data corresponds to the local backlight control signal of the first group in the multiple sets of backlight zones, the second set of backlight data corresponds to the local backlight control signal of the second group in the multiple sets of backlight zones, and so on. For another example, at least some of the multiple sets of backlight data include the local backlight control signals of at least two backlight zones. For example, the first set of backlight data includes the local backlight control signal of the first group in the multiple sets of backlight zones, and the seventh set of backlight data includes the local backlight control signals of the seventh and eighth backlight zones in the multiple sets of backlight zones.

[0082] In some embodiments of the present disclosure, the controller is configured to, while acquiring the local backlight control signal of the (i + K)-th row of backlight zones, provide the backlight data of the i-th row of backlight zones to the backlight driver so that the backlight driver drives the i-th row of backlight zones, where i is a positive integer less than M - K + 1.

[0083] In some embodiments of the present disclosure, the backlight unit includes a plurality of light emitting diodes (LEDs), and each row of LEDs serves as a group of a plurality of backlight zones. The above embodiments will be described below by taking each row of LEDs as a group of backlight zones as an example.

[0084] For example, K = 2, M = 8. For example, first, according to the image data of the first group of backlight zones (i.e., the first row of LEDs) and the second group of backlight zones (i.e., the second row of LEDs), the local backlight control signals of the first group of backlight zones and the second group of backlight zones are calculated through spatial and temporal filtering. After the data calculation of the first 2 groups of backlight zones is completed, starting from the third group of backlight zones (i.e., the third LED), the backlight data of the first group is sent through SPI. While sending the backlight data of the first group of backlight zones, the backlight data and spatial and temporal filtering of the third group of backlight zones are calculated. After the calculation is completed, while sending the backlight data of the second group of backlight zones, the backlight data and spatial and temporal filtering of the fourth group of backlight zones are calculated. After the calculation is completed, while sending the backlight data of the third group of backlight zones, the backlight data and spatial and temporal filtering of the fifth group of backlight zones are calculated. After the calculation is completed, while sending the backlight data of the fourth group of backlight zones, the backlight data and spatial and temporal filtering of the sixth group of backlight zones are calculated. After the calculation is completed, while sending the backlight data of the fifth group of backlight zones, the backlight data and spatial and temporal filtering of the seventh group of backlight zones are calculated. After the calculation is completed, while sending the backlight data of the sixth group of backlight zones, the backlight data and spatial and temporal filtering of the eighth group of backlight zones are calculated.

[0085] For example, the backlight unit includes M groups of backlight zones, and the controller is configured to: within one frame time, sequentially provide N groups of backlight data to the backlight driver, where M is a positive integer greater than or equal to 2, and 2 ≤ N ≤ M. For example, or M = 8, N = 6, etc.

[0086] In some embodiments of the present disclosure, M is a positive integer greater than or equal to 3, N < M, the data volume of the Nth group of backlight data is greater than the data volume of each of the other groups, and the Nth group of backlight data is the last group of backlight data within one frame time.

[0087] For example, for an 8-group backlight zone, the 8-group backlight zone is divided into 7 groups of backlight data, and the seventh group of backlight data is the last group of backlight data. In this example, N = M - 1. It should be noted that the embodiments of the present disclosure do not limit M = 8 and N = 7. The above example is only one implementation manner and has no limiting effect on the present disclosure.

[0088] For example, the backlight data from the first group of backlight zones to the M - Kth group of backlight zones are respectively used as a group of backlight data; and the backlight data of each of the backlight zones from the (M - K + 1)th group of backlight zones to the Mth group of backlight zones are combined into a group of backlight data.

[0089] For example, in the above example where K = 2 and M = 8, the backlight data of the first to sixth backlight partitions are respectively taken as a group of backlight data, and the backlight data of the seventh and eighth backlight partitions are combined into a group of backlight data.

[0090] For example, while transmitting the backlight data of the sixth backlight partition, calculate the backlight data and spatio-temporal filtering of the eighth backlight partition. After the calculation is completed, the backlight data of the seventh and eighth backlight partitions are packed into a group of backlight data and provided to the LED driving circuit board 13. Packing the backlight data of the seventh and eighth backlight partitions into a group of backlight data can reduce the number of transmissions.

[0091] In some other embodiments of the present disclosure, the backlight data of the seventh backlight partition and the backlight data of the eighth backlight partition can also be transmitted independently, that is, the backlight data of the seventh backlight partition is transmitted as one data packet, and the backlight data of the eighth backlight partition is transmitted as another data packet. This can reduce the time for DMA to transfer data.

[0092] In some embodiments of the present disclosure, N = M - P, and the data volume of the Nth group of backlight data is (P + 1) times that of each group of backlight data in other groups. For example, the backlight data of each of the first M - P - 1 backlight partitions is taken as a group of backlight data, and the backlight data of the last P + 1 backlight partitions are taken as the last group of backlight data. The data volume of the last group of backlight data is (P + 1) times that of each of the other groups. Packing the backlight data of the last P + 1 backlight partitions into a group of backlight data can reduce the number of transmissions of backlight data while reducing latency.

[0093] In some embodiments of the present disclosure, the display device further includes a display panel. The display device is configured to transmit display data to the display panel. For example, the controller can be configured to directly or indirectly transmit display data to the display panel. For example, the display device further includes a display panel driving circuit, and the display panel driving circuit transmits display data to the display panel. For example, the controller can be configured to control the display panel driving circuit to transmit display data to the display panel.

[0094] In some embodiments of the present disclosure, the starting point of one frame time is the starting point when the display panel receives one frame of display data, and the ending point of one frame time is the starting point when the display panel receives the next frame of display data.

[0095] In some embodiments of the present disclosure, the controller is connected to the backlight driver in an external peripheral interface manner. For example, in Figure 1CIn the structure, the second control device 12 is connected to the MCU through a peripheral interface, such as the above-mentioned SPI interface. The SPI interface includes 3 logic lines, namely a data signal line for transmitting data signals, a clock signal line for transmitting clock signals, and a chip select signal line.

[0096] For example, each backlight data includes a data signal, a clock signal, and a chip select signal. The data signal includes a header and a backlight local control signal. The header is used to indicate the target backlight partition group among multiple groups of backlight partitions to which the backlight local control signal included in the data signal belongs, and the headers of multiple groups of backlight data are different from each other.

[0097] For example, the header is used to indicate which backlight partition among multiple groups of backlight partitions the backlight local control signal included in the data signal belongs to. For example, the value of the header being 0x0FF8 represents the first group of partitions; the value of the header being 0x1FF8 represents the second group of partitions; the value of the header being 0x2FF8 represents the third group of partitions; the value of the header being 0x3FF8 represents the fourth group of partitions; the value of the header being 0x4FF8 represents the fifth group of partitions; the value of the header being 0x5FF8 represents the sixth group of partitions; the value of the header being 0x6FF8 represents the seventh group of partitions; the value of the header being 0x8FF8 represents the eighth group of partitions. Through the header, it is possible to determine which backlight partition the backlight local control signal in the backlight data belongs to.

[0098] In some embodiments of the present disclosure, in addition to including a header and a backlight local control signal, the data signal further includes a command, and the command is used to indicate whether the data signal includes a backlight local control signal.

[0099] For example, if the value of Command is 0xFFFC, it indicates that the backlight data includes a backlight local control signal.

[0100] For example, in some embodiments of the present disclosure, a protocol for a data signal is provided, and the format of the protocol is a header (Indicator) + a command (Command) + a backlight local control signal. The backlight local control signal in the data signal is judged by the header to control the brightness of which backlight partition, and the command is used to judge whether the data signal is a data signal correctly carrying a backlight local control signal. The backlight local control signal is used to indicate the local duty ratio of the backlight partition.

[0101] In some embodiments of the present disclosure, the controller is connected to the backlight driver through a peripheral interface method (such as SPI).

[0102] Figure 2 The figure shows a schematic diagram of the SPI signal provided by the entire-frame SPI provided in at least one embodiment of the present disclosure.

[0103] As Figure 2As shown, the SPI signal includes a data signal D, a chip select signal CS, and a clock signal CK.

[0104] The clock signal CK is used to synchronize the transmitter (i.e., the controller) and the receiver (i.e., the LED driver circuit board 13).

[0105] At the falling edge of the chip select signal CS, the controller starts to transmit the data signal D and provides the data signal D during the invalid level (e.g., low level) of the chip select signal CS. In some embodiments of the present disclosure, at the rising edge of the chip select signal CS, the LED driver circuit board 13 initializes the SPI signal.

[0106] The data signal D includes the header, command, and backlight local control signal for each group. As Figure 2 shown, if K = 2, after the controller finishes calculating the backlight data of the second row, it provides the first group of backlight data to the LED driver circuit board 13; after finishing calculating the backlight data of one frame, it provides the last two groups of backlight data to the LED driver circuit board 13.

[0107] It should be noted that the present disclosure does not limit the specific values of the header and command and the meanings corresponding to the values. Those skilled in the art can design the specific values and meanings of the header and command by themselves.

[0108] Figures 3A - 3G shows a schematic diagram of a plurality of data packets provided to a backlight driver according to at least one embodiment of the present disclosure.

[0109] In Figures 3A - 3G the example, the controller communicates with the backlight driver through SPI. As Figures 3A - 3G shown, the SPI communication includes 3 logic lines, namely a data signal line DT, a chip select signal line CS', and a clock signal line CLK.

[0110] During the low level stage of the chip select signal CS', the data signal line DT transmits the backlight data according to the clock signal. Each clock cycle is used to transmit one bit of the backlight data. As described above, some embodiments of the present disclosure define a data protocol including a header, a command, and a backlight local control signal. For example, if both the header and the command are 16 bits, then the transmission of the header and the command both requires 16 clock cycles. In some examples of the present disclosure, for example, the backlight unit is an 8×8 LED array, and each row of LEDs is used as a group of backlight partitions, that is, each group of backlight partitions includes 8 LEDs. If the backlight local control signal for each LED is 16 bits, then the backlight local control signal for each LED requires 16 clock cycles to transmit.

[0111] As Figure 3AAs shown, if the value of the second 16 clock cycles is 0XFFFC, it indicates that the data packet is correct backlight data. And if the value of the first 16 clock cycles in this data packet is 0X0FF8, it means that the backlight data includes the local backlight control signals for the first group of backlight partitions. The 0X0001, 0X0002, 0X0003, 0X0004, 0X0005, 0X0006, 0X0007, and 0X0008 in this data are respectively the local backlight control signals for each of the multiple LEDs in the first row. It should be noted that 0X0001, 0X0002, 0X0003, 0X0004, 0X0005, 0X0006, 0X0007, and 0X0008 are only examples and do not limit the present disclosure. In actual use, these local backlight signals are determined according to the brightness required for each frame of the picture. Figures 3B - 3G is similar to Figure 3A

[0112] Similarly, Figure 3B if the header of [] is 0X1FF8 and the command is 0XFFFC, then Figure 3B the data packet shown is the local backlight control signal for the second group of backlight partitions, that is, the data signal located after the command 0XFFFC is the local backlight control signal for the second group of backlight partitions.

[0113] Figure 3C if the header of [] is 0X2FF8 and the command is 0XFFFC, then Figure 3C the data packet shown includes the local backlight control signal for the third group of backlight partitions, that is, the data signal located after the command 0XFFFC is the local backlight control signal for the third group of backlight partitions.

[0114] Figure 3D if the header of [] is 0X3FF8 and the command is 0XFFFC, then Figure 3D the data packet shown includes the local backlight control signal for the fourth group of backlight partitions, that is, the data signal located after the command 0XFFFC is the local backlight control signal for the fourth group of backlight partitions.

[0115] Figure 3E if the header of [] is 0X4FF8 and the command is 0XFFFC, then Figure 3E the data packet shown includes the local backlight control signal for the fifth group of backlight partitions, that is, the data signal located after the command 0XFFFC is the local backlight control signal for the fifth group of backlight partitions.

[0116] Figure 3F if the header of [] is 0X5FF8 and the command is 0XFFFC, then Figure 3F the data packet shown includes the local backlight control signal for the sixth group of backlight partitions, that is, the data signal located after the command 0XFFFC is the local backlight control signal for the sixth group of backlight partitions.​

[0117] Figure 3G It is a data packet of the backlight data for the 7th row backlight partition and the 8th row backlight partition. As Figure 3G shown, the data packet includes the header 0X6FF8, indicating that the backlight local control signal after the header 0X6FF8 is the backlight data of the seventh group of backlight partitions, and the data packet includes the header 0X7FF8, indicating that the backlight local control signal after the header 0X7FF8 is the backlight local control signal of the eighth group of backlight partitions.

[0118] In some embodiments of the present disclosure, the controller is further configured to provide a synchronization signal to the backlight driver, and the synchronization signal is used to indicate the start of transmitting the backlight data.

[0119] Regarding the synchronization signal, in some examples, the synchronization signal Vsync is sent once per frame (i.e., there is an active pulse width of one synchronization signal per frame), and the backlight driver performs 8-fold frequency output on it. The specific method is to capture the frequency of the synchronization signal Vsync once each time the device is powered on and compare it with the default frequency. If it is consistent with the default frequency, the default frequency is directly output (such as 8-fold frequency of 60hz, 480hz). If it is inconsistent with the default frequency, a new 8-fold frequency is obtained through a look-up table method and output. The active pulse width is, for example, the high-level period of the synchronization signal.

[0120] In some embodiments of the present disclosure, the synchronization signal includes M active pulse widths per frame. That is, the number of active pulse widths of the synchronization signal is the same as the number of backlight partitions. For example, by sending the synchronization signal Vsync 8 times through the controller, the backlight driver can directly output after receiving the synchronization signal Vsync, which is used to provide a synchronization signal to the backlight driving chip (for example, Figure 1C the LED integrated circuit driving chip 132 in ), so as to improve the data synchronization accuracy and reduce the execution time of the backlight driver.

[0121] In this embodiment, the backlight data is refreshed 8 times within one frame time, and each time a set of the latest backlight data is added. The backlight response time delay can be controlled within the range of 0.35 frame to 0.55 frame; compared with the above example of sending the synchronization signal Vsync once per frame, after the backlight driver receives a frame of data, it outputs the frame of backlight data at an 8-fold frequency. Although it is also refreshed 8 times per frame, the same data is repeated 8 times, and the backlight response time delay is about 1.25 frames. Therefore, this solution effectively improves the backlight response speed.

[0122] For example, the data provided by the controller to the backlight driver is obtained by detecting the pins of the SPI interface connected between the controller and the backlight driver, and the display data received by the controller is obtained by detecting the input pins of the controller.

[0123] In some embodiments of the present disclosure, the display device further includes a display panel. The display panel is coupled to the backlight unit, wherein the backlight unit is configured to provide a planar light source for the display of the display panel. The time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit is switched from the first frame to the second frame is less than 1.23 times the time length of one frame. In this example, the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit is switched from the first frame to the second frame is the backlight response time delay. The moment when the duty cycle is switched from the first frame to the second frame can be understood as the moment when the duty cycle corresponding to the first frame is switched to the duty cycle corresponding to the second frame.

[0124] In some embodiments of the present disclosure, if the connection mode of the LEDs of the backlight unit is to use the LED anode as the common terminal, the cathode signal of the backlight unit is detected. The time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty cycle reflected by the detected cathode signal is switched from the first frame to the second frame is less than 1.23 times the time length of one frame. If the connection mode of the LEDs of the backlight unit is to use the LED cathode as the common terminal, the anode signal of the backlight unit is detected. The time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty cycle reflected by the detected anode signal is switched from the first frame to the second frame is less than 1.23 times the time length of one frame.

[0125] For example, if the pixel value of the first frame is 0 and the pixel value of the second frame is 255, then the first frame is 100% and the second frame is 0%.

[0126] Similarly, in some embodiments of the present disclosure, the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit is switched from the first frame to the second frame is less than or equal to 0.55 times the time length of one frame.

[0127] In some embodiments of the present disclosure, the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit is switched from the first frame to the second frame is 0.35 to 0.55 times the time length of one frame.

[0128] The display data of the first frame corresponds to the duty cycle of the cathode or anode of the backlight unit at the first frame, and the display data of the second frame corresponds to the duty cycle of the cathode or anode of the backlight unit at the second frame.

[0129] The above embodiments of the present disclosure shorten the problem of the delay between backlight refresh and display screen refresh.

[0130] Figure 4 A schematic diagram showing the delay time of the backlight partition provided by the embodiments of the present disclosure.

[0131] As Figure 4 shown, if the image switches from a black screen to a white screen at time T1, and a synchronization signal Vsync is sent once per frame, waiting until the backlight data of multiple groups of backlight partitions are obtained and then provided to the backlight driver, and in the example where the backlight driver performs 8-fold frequency output on it, the signal output by the backlight partition (for example, the signal output by the anode of the LED) is curve a. In curve a, the duty cycle of the PWM signal of the backlight partition decreases at time T2. For example, the duty cycle of the PWM signal decreases from 100% to 0%. Therefore, the backlight response time is delayed by approximately 1.25 frames.

[0132] As Figure 4 shown, if the display panel receives image data that switches from a black screen to a white screen at time T1, in the embodiments of the present disclosure, the signal output by the backlight partition (for example, the signal output by the anode of the LED) is curve b. In curve b, the duty cycle of the PWM signal of the backlight partition changes abruptly at time T3. Therefore, the backlight response time delay can be controlled within the range of 0.35 frames to 0.55 frames. For example, if one frame of the screen is 16.7 ms, then in the embodiments of the present disclosure, the backlight response time delay can be within the range of 6 ms to 8 ms.

[0133] As Figure 1C shown, in some embodiments of the present disclosure, the backlight driver includes a micro control unit 131 and a storage unit. The storage unit is used to store the backlight driving signals of each of the multiple backlight partitions. The micro control unit 131 is configured to: receive each group of backlight data provided by the controller; determine the target backlight partition to which the backlight local control signal in each group of backlight data belongs according to the header; obtain the global backlight driving signal; determine the target backlight driving signal of the target backlight partition based on the global backlight driving signal and the backlight local control signal; and update the target backlight driving signal to the data address corresponding to the target backlight partition in the storage unit.

[0134] For example, the MCU 131 receives each group of backlight data provided by the second control device 12, and determines the target backlight partition to which the backlight local control signal in each group of backlight data belongs according to the value of the header. For example, if the value of the header is 0x0FF8, then the target backlight partition to which the backlight local control signal in this group of backlight data belongs is the first group of partitions. The global backlight driving signal is, for example, a brightness modulation signal obtained from the TCON 11. The brightness modulation signal and the backlight local control signal are subjected to an "AND" operation to obtain the brightness control signal of each backlight partition.

[0135] For example, each backlight zone corresponds to a data address, and the target backlight drive signal of the target backlight zone is written and stored at the data address position corresponding to the target backlight zone.

[0136] In some embodiments of the present disclosure, the microcontroller unit is configured to receive each group of backlight data through direct memory access (DMA). Direct memory access allows certain hardware subsystems to access memory independently of the processing unit. For example, after the SPI data is received, the DMA of the MCU uses the storage register to store the backlight data.

[0137] In some embodiments of the present disclosure, after the DMA finishes receiving the SPI data, it enters the DMA interrupt. First, a header determination is performed to identify which row the data belongs to. If it is the first row, it is written to the data address of the first row in the corresponding array. At the same time, the brightness modulation signal is captured to calculate the duty cycle, and it is determined whether the duty cycle value of the brightness modulation signal has changed and whether the duration after the change exceeds the period of two brightness modulation signals. If so, the brightness control signal of the backlight zone is output to the LED driver chip, and after receiving the data, the LED driver chip refreshes the backlight brightness. The processing flow is as Figure 5A shown.

[0138] In some embodiments of the present disclosure, the microcontroller unit is further configured to: in response to the global backlight drive signal changing to an updated value, determine whether the duration of the updated value is greater than or equal to a preset threshold; and in response to the duration of the updated value being greater than or equal to the preset threshold, re-determine the target backlight drive signal based on the updated value and the backlight local control signal.

[0139] Figure 5A The flowchart shows a method for calculating the brightness control signal of each backlight zone provided by at least one embodiment of the present disclosure.

[0140] As Figure 5A shown, the method includes steps S501 to S506.

[0141] Step S501: After the DMA finishes receiving the SPI data, it enters the DMA interrupt.

[0142] Step S502: Header identification to identify which row the backlight data belongs to.

[0143] Step S503: Write the target backlight drive signal to the corresponding data address of the array Duty1 of the backlight local control signal. For example, if it is the first row, it is written to the data address of the first row in the array Duty1 of the backlight local control signal.

[0144] Step S504: Capture the brightness modulation signal for duty cycle calculation. For example, perform an AND operation on each element in the array Duty1 of the backlight local control signal with the brightness modulation signal to obtain an array Duty2 of brightness control signals for each backlight zone.

[0145] Step S505: Send the array Duty2 of brightness control signals for each backlight zone to the LED integrated circuit driver chip 132. Output the backlight Duty2 value to the LED integrated circuit driver chip 132, and the LED integrated circuit driver chip 132 refreshes the backlight brightness after receiving the data.

[0146] Step S506: Enter the next DMA cycle.

[0147] During Figure 5A the thread execution process of the method, another thread for updating the brightness modulation signal also executes synchronously. Figure 5B shows a flowchart of a method for updating a brightness modulation signal provided by at least one embodiment of the present disclosure. For example, Figure 5B the thread is executed by the main program and enters the Figure 5A subroutine shown after a DMA interrupt occurs.

[0148] As Figure 5B shown, the method includes steps S510 to S530.

[0149] Step S510: Capture the brightness modulation signal.

[0150] Step S520: Determine whether the duty cycle value of the brightness modulation signal has changed and whether the duration of the changed duty cycle value (i.e., the updated value) exceeds two cycles of the brightness modulation signal.

[0151] Step S530: If the duration of the changed duty cycle value of the brightness modulation signal exceeds two cycles of the brightness modulation signal, update the brightness modulation signal to this duty cycle value.

[0152] If the duration of the changed duty cycle value of the PWM does not exceed two cycles of the brightness modulation signal, return to execute step S510.

[0153] In this embodiment, after the duty cycle of the brightness modulation signal changes, it is further determined whether the duration of the changed duty cycle value exceeds two cycles of the brightness modulation signal, and the brightness modulation signal is updated only when it exceeds two cycles of the brightness modulation signal, which can solve the problem of backlight flicker caused by capture errors of the brightness modulation signal.

[0154] In some embodiments of the present disclosure, as Figure 1CAs shown, the backlight driver further includes a backlight driving chip (e.g., the LED integrated circuit driving chip 132). The backlight unit includes M groups of backlight partitions. The micro-control unit is further configured to receive the synchronization signal provided by the controller and directly provide the synchronization signal to the backlight driving chip. The synchronization signal includes M effective pulse widths in each frame, and the effective pulse width of the synchronization signal indicates the backlight data transmission. The micro-control unit is further configured to provide, at the effective edge of the synchronization signal, multiple backlight driving signals stored in the storage unit to multiple backlight driving chips in response to the update of the target backlight driving signal to the data address.

[0155] In some embodiments of the present disclosure, each group of backlight data described above further includes: a chip select signal transmitted by the chip select signal line. The backlight driver further includes a receiving register and a storage register. The backlight data is written into the receiving register, and at the rising edge of the chip select signal, the backlight data in the receiving register is written into the storage register and the receiving register is cleared.

[0156] The SPI initialization time moves from the falling edge of CS to the rising edge of CS, that is, after the TCON data transmission is completed. This enables the SPI data to be stored in the storage register after reception, and then the receiving register is initialized to prepare for the next data reception; even if interrupted by a DMA interrupt, it does not affect the current data reception and the next data reception; if an error occurs or data is missed during the TCON data transmission this time and the DMA interrupt cannot be completed, the current error data will be cleared during the MCU initialization to ensure the correct reception of the next data.

[0157] Figure 6A A signal timing diagram showing that the controller generates the backlight data of all backlight partitions and then transmits the backlight data is shown; Figure 6B A signal timing diagram showing that the controller generates and transmits while is shown for at least one embodiment of the present disclosure. As Figure 6A As shown, at time t1, the controller TCON can be configured to issue a synchronization signal Vsync. Each frame of the synchronization signal Vsync includes a rising edge. At the rising edge of the synchronization signal Vsync, the controller TCON issues an SPI signal. After receiving the SPI signal from the controller TCON, the micro-control unit (MCU) in the backlight driver provides a brightness control signal to the LED integrated circuit driving chip in the backlight driver at the falling edge of the synchronization signal Vsync. The controller TCON provides an SPI signal at the rising edge of the synchronization signal Vsync.

[0158] If at time t1, the display signal received by the display panel (i.e., the OC signal) switches to the display signal of the Nth image frame (abbreviated as "the Nth frame"), but since the controller TCON needs to parse the display signal provided by the front end such as the SOC, calculate the initial value of the backlight for each partition, and perform spatial and temporal filtering to obtain the local backlight control signal. When the controller TCON finishes the calculation and obtains the local backlight control signal, the rising edge of the synchronization signal Vsync has passed, and it can only wait for the next rising edge of the synchronization signal Vsync. Therefore, for a period of time after time t1, the signal provided by the controller TCON to the MCU through SPI is still the SPI signal (i.e., the backlight data) of the (N - 1)th frame. That is, at the rising edge of the synchronization signal Vsync at time t1, the controller TCON provides the backlight data of the (N - 1)th frame to the MCU through SPI.

[0159] As Figure 6A shown, in this example, the MCU performs 8 - fold frequency multiplication on the synchronization signal Vsync, and at the falling edge of the 8 - fold frequency - multiplied synchronization signal Vsync, the MCU provides the SPI signal to the LED integrated circuit driver chip.

[0160] As Figure 6A shown, at the second moment t2 after the controller TCON provides the SPI signal of the Nth frame to the MCU in the backlight driver, the duty cycle of the brightness control signal output by the LED integrated circuit driver chip in the backlight driver changes. The time length between time t2 and time t1 is approximately the time length of 1.25 frames. For example, after the MCU 131 in Figure 1C performs an "AND" operation on the local backlight control signal and the brightness modulation signal (global PMW signal) to obtain the brightness control signal for each backlight partition, the brightness control signal output by the LED integrated circuit driver chip 132 changes at time t2. That is, there is a delay of 1.25 frames for the brightness control signal.

[0161] As Figure 6A shown, the SPI signal 601 sent by the MCU is the brightness control signal of the Nth frame. The 8 SPI signals before the SPI signal 601 are the same, and they are all the brightness control signals required for each light - emitting diode in the (N - 1)th frame. The SPI signal 601 and the 7 SPI signals after it are the brightness control signals required for each light - emitting diode in the Nth frame.

[0162] The LED integrated circuit driver chip outputs the LED drive signal for driving the LED according to the brightness control signal. The LED integrated circuit driver chip provides the LED drive signal with a changed duty cycle to the LED at the rising edge of the synchronization signal Vsync of the MCU, thereby changing the brightness of the LED.

[0163] In some embodiments of the present disclosure, the controller provides backlight data to the backlight driver at the active edge of each synchronization signal. As Figure 6B shown, the active edge of the synchronization signal is, for example, the falling edge of the synchronization signal Vsync. The controller TCON provides an SPI signal to the MCU in the backlight driver at the falling edge of each synchronization signal Vsync, and provides backlight data to the LED integrated circuit driver chip in the backlight driver through the MCU in the backlight driver. As Figure 6B shown, the display signal received by the display panel (i.e., the OC signal) switches to the display signal of the (N + 1)-th frame at time t3. At time t3, the controller TCON can be configured to issue the synchronization signal Vsync. Each frame of the synchronization signal Vsync issued by the controller TCON includes M rising edges. If the display device has 8 backlight zones, then M is equal to 8. At the rising edge of the synchronization signal Vsync issued by the controller TCON, the controller TCON issues an SPI signal, and the MCU in the backlight driver directly outputs the synchronization signal Vsync without 8-fold frequency multiplication. After receiving the SPI signal from the controller TCON, the MCU in the backlight driver provides a brightness control signal to the LED integrated circuit driver chip 132 in the backlight driver at the falling edge of the synchronization signal Vsync.

[0164] If the image screen received by the display panel changes at time t3, then the brightness control signal of the first group of backlight zones output at time t4 by the LED integrated circuit driver chip 132 in the backlight driver changes, and thereafter, the brightness control signals of the subsequent second group of backlight zones also change accordingly. That is, the delay of the brightness control signal can be controlled within the range of 0.35 frame to 0.55 frame.

[0165] The SPI signal 602 provided by the MCU in the backlight driver to the LED integrated circuit driver chip is the first SPI signal of the N-th frame. This SPI signal includes the brightness control signal of the first group of backlight zones updated by the MCU according to the global backlight drive signal and the local backlight control signal (i.e., the brightness control signal of the first group of backlight zones is for the (N + 1)-th frame image) and the brightness control signals of the second group of backlight zones to the eighth group of backlight zones. The brightness control signals of the second group of backlight zones to the eighth group of backlight zones are still for the N-th frame image.

[0166] At the rising edge of the synchronization signal Vsync provided by the MCU in the backlight driver next after the MCU in the backlight driver provides the SPI signal 602 to the LED integrated circuit driver chip in the backlight driver, the duty cycle of the LED drive signal output by the LED integrated circuit driver chip in the backlight driver has changed according to the updated brightness control signal of the first group of backlight zones.

[0167] The SPI signal 603 provided by the MCU in the backlight driver to the LED integrated circuit driver chip is the second SPI signal of the (N + 1)-th frame. This SPI signal includes the brightness control signals for the first group of backlight partitions of the (N + 1)-th frame, the brightness control signals for the second group of backlight partitions of the (N + 1)-th frame, and the brightness control signals for the third group of backlight partitions to the eighth group of backlight partitions. The brightness control signals for the third group of backlight partitions to the eighth group of backlight partitions are still those of the N-th frame image.

[0168] At the rising edge of the synchronization signal Vsync provided by the MCU in the next backlight driver after the MCU in the backlight driver provides the SPI signal 603 to the LED integrated circuit driver chip, the duty cycle of the LED drive signal output by the LED integrated circuit driver chip in the backlight driver has changed according to the updated brightness control signals for the second group of backlight partitions. Other groups of backlight partitions are similar to the first group of backlight partitions and the second group of backlight partitions described above, and will not be elaborated here.

[0169] The LED drive signal refers to the duty cycle signal of the LED cathode / anode. When the LED drive signal of the first group of backlight partitions changes, the LED drive signal of the second group of backlight partitions has not been updated yet, so there are differences (for example, when the screen changes from black to white, when the duty cycle of the first group becomes larger to display the white screen, at this moment, the second group has not changed yet and is still the duty cycle corresponding to the black screen).

[0170] It should be noted that the square wave signal of the LED drive signal is only for illustrative purposes, and in actual applications, the frequency of the square wave signal can be greater than Figure 6B the frequency shown.

[0171] In some embodiments of the present disclosure, the display device further includes: a display panel, the display panel is coupled to the backlight unit, and the backlight unit is configured to provide a planar light source for the display of the display panel. For example, as described above, the display panel can be a liquid crystal display panel, and the backlight unit is disposed on the non-display side of the liquid crystal panel to provide a planar light source for the display of the liquid crystal panel.

[0172] Another aspect of the present disclosure provides a method for adjusting the brightness of a backlight unit, and the backlight unit includes multiple groups of backlight partitions.

[0173] Figure 7 FIG. shows a brightness adjustment method provided by at least one embodiment of the present disclosure. This brightness adjustment method can be applied to the display device provided by any embodiment of the present disclosure.

[0174] As Figure 7 shown, this brightness adjustment method includes steps S701 and S702.

[0175] Step S701: According to a frame of image to be displayed, multiple groups of backlight data are sequentially generated. The multiple groups of backlight data are different, and each group of backlight data includes the backlight local control signals of some backlight partitions in multiple groups of backlight partitions.

[0176] Step S702: Within one frame time, multiple groups of backlight data are sequentially provided to the backlight driver, and the backlight driver controls the brightness of multiple groups of backlight partitions according to the backlight local control signals of the multiple groups of backlight data.

[0177] This brightness adjustment method can reduce the delay between backlight refresh and display screen refresh.

[0178] For step S701, please refer to the description above for the multiple groups of backlight data and the backlight local control signals. Step S701 can be executed by the controller described above. For step S702, please refer to the description above, and it can be executed by the controller.

[0179] In some embodiments of the present disclosure, within one frame time, multiple groups of backlight data are sequentially provided to the backlight driver, including: starting from generating the backlight local control signals of the (K + 1)-th group of backlight partitions in M groups of backlight partitions, within one frame time, multiple groups of backlight data are sequentially provided to the backlight driver, where M is a positive integer greater than or equal to 2, and K is a non-negative integer less than (M - 1).

[0180] In some embodiments of the present disclosure, starting from generating the backlight local control signals of the (K + 1)-th group of backlight partitions in M groups of backlight partitions, within one frame time, multiple groups of backlight data are sequentially provided to the backlight driver, including: while obtaining the backlight local control signals of the (i + K)-th group of backlight partitions, providing the backlight data of the i-th group of backlight partitions to the backlight driver, where i is a positive integer less than M - K + 1.

[0181] In some embodiments of the present disclosure, the multiple groups of backlight data respectively include the backlight local control signals of different groups of backlight partitions in multiple groups of backlight partitions.

[0182] In some embodiments of the present disclosure, each group of backlight data includes a data signal, and the data signal includes a header and a backlight local control signal. The header is used to indicate the target group of backlight partitions in multiple groups of backlight partitions to which the backlight local control signal included in the data signal belongs, and the headers of the multiple groups of backlight data are different from each other.

[0183] In some embodiments of the present disclosure, the data signal further includes a command, and the command is used to indicate whether the data signal includes the backlight local control signal.

[0184] In some embodiments of the present disclosure, the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the data transmitted by the peripheral interface is switched from the first frame to the second frame is less than 1.23 times the time length of one frame; or the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit is switched from the first frame to the second frame is less than 1.23 times the time length of one frame.

[0185] In some embodiments of the present disclosure, the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the data transmitted by the peripheral interface is switched from the first frame to the second frame is less than 0.55 times the time length of one frame; or the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit is switched from the first frame to the second frame is less than 0.55 times the time length of one frame.

[0186] In some embodiments of the present disclosure, the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the data transmitted by the peripheral interface is switched from the first frame to the second frame is 0.35 to 0.55 times the time length of one frame; or the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit is switched from the first frame to the second frame is 0.35 to 0.55 times the time length of one frame.

[0187] In some embodiments of the present disclosure, the backlight driver includes a micro-control unit. The micro-control unit performs: receiving each group of backlight data provided by the controller; determining the target backlight partition to which the backlight local control signal in each group of backlight data belongs according to the header; obtaining global backlight driving parameters; determining the target backlight driving parameters of the target backlight partition based on the global backlight driving parameters and the backlight local control signal; and writing the target backlight driving parameters of the target backlight partition into the data address corresponding to the target backlight partition in the backlight driver.

[0188] In some embodiments of the present disclosure, the backlight driver further includes a backlight driving chip, the backlight unit includes M groups of backlight partitions, the micro-control unit is further configured to receive a synchronization signal provided by the controller, and directly provide the synchronization signal to the backlight driving chip. The synchronization signal includes M effective pulse widths in each frame, and the effective pulse width of the synchronization signal indicates the start of transmitting the backlight data.

[0189] In some embodiments of the present disclosure, the microcontroller unit further performs: in response to the global backlight driving parameter changing to an updated value, determining whether the duration of the updated value is greater than or equal to a preset threshold; and in response to the duration of the updated value being greater than or equal to the preset threshold, re-determining the target backlight driving parameter based on the updated value and the local backlight control signal.

[0190] In some embodiments of the present disclosure, the microcontroller unit is configured to receive each group of backlight data through direct memory access.

[0191] In some embodiments of the present disclosure, each group of backlight data further includes: a chip select signal transmitted by a chip select signal line, the backlight data is written into a receiving register, and at the rising edge of the chip select signal, the backlight data in the receiving register is written into a storage register and the receiving register is cleared.

[0192] It should be noted that in the embodiments of the present disclosure, the above-mentioned units or components of the display device correspond to the respective steps of the brightness adjustment method. For the relevant descriptions of the brightness adjustment method, reference can be made to the relevant descriptions of the display device, which will not be elaborated here. The components and structures of the above-mentioned display device are only exemplary and not restrictive. According to needs, the above-mentioned display device may further include other components and structures.

[0193] The technical effects of the storage medium provided by the embodiments of the present disclosure can be referred to the corresponding descriptions of the image display processing method in the above embodiments, which will not be elaborated here.

[0194] The following points need to be explained:

[0195] (1) The drawings of the embodiments of the present disclosure only relate to the structures involved in the embodiments of the present disclosure, and other structures can refer to the general design.

[0196] (2) Without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0197] The above are only exemplary embodiments of the present disclosure and are not used to limit the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Claims

1. A display device, comprising: A backlight unit, comprising multiple groups of backlight partitions; A backlight driver, connected to the backlight unit and configured to control the brightness of the multiple groups of backlight partitions according to the local backlight control signals of the respective multiple groups of backlight partitions; And A controller, connected to the backlight driver and configured to: Generate multiple groups of backlight data according to a frame of image to be displayed, at least one group of backlight data in the multiple groups of backlight data is different from other groups of backlight data, and each group of backlight data includes the local backlight control signals of some groups of backlight partitions in the multiple groups of backlight partitions; And Within a frame time, sequentially provide the multiple groups of backlight data to the backlight driver.

2. The display device according to claim 1, wherein, The multiple groups of backlight data are different from each other; The multiple groups of backlight data respectively include the local backlight control signals of different groups of backlight partitions in the multiple groups of backlight partitions.

3. The display device according to claim 2, wherein, Each group of backlight data includes a data signal, the data signal includes a header and the local backlight control signal, the header is used to indicate the target group of backlight partitions in the multiple groups of backlight partitions to which the local backlight control signal included in the data signal belongs, and the headers of the multiple groups of backlight data are different from each other.

4. The display device according to claim 3, wherein, The data signal further includes a command, and the command is used to indicate whether the data signal includes the local backlight control signal.

5. The display device according to claim 1, wherein, The controller is connected to the backlight driver in a peripheral interface manner, and transmits the multiple groups of backlight data through the peripheral interface.

6. The display device according to claim 1, wherein, The display device further includes a display panel, and the time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty ratio of the cathode or anode of the backlight unit is switched from the first frame to the second frame is less than 1.23 times the frame time length.

7. The display device according to claim 6, wherein, The time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty ratio of the cathode or anode of the backlight unit is switched from the first frame to the second frame is less than or equal to 0.55 times the frame time length.

8. The display device according to claim 7, wherein, The time length between the moment when the display data received by the display panel is switched from the first frame to the second frame and the moment when the duty ratio of the cathode or anode of the backlight unit is switched from the first frame to the second frame is 0.35 to 0.55 times the frame time length.

9. The display device according to any one of claims 1 to 8, wherein, The backlight unit includes M groups of backlight partitions, and the controller is configured to: Within a frame time, sequentially provide N groups of backlight data to the backlight driver, where M is a positive integer greater than or equal to 2, and 2≤N≤M.

10. The display device according to claim 9, wherein, M is a positive integer greater than or equal to 3, N<M, The data volume of the Nth group of backlight data is greater than the data volume of each of the other groups of backlight data, and the Nth group of backlight data is the last group of backlight data within the frame time.

11. The display device according to claim 10, wherein, N = M - 1.

12. The display device according to claim 10, wherein, N = M - P, and the data volume of the Nth group of backlight data is (P + 1) times the data volume of each of the other groups of backlight data.

13. The display device according to claim 9, wherein, The starting point of the frame time is the starting point when the display panel receives a frame of display data, and the ending point of the frame time is the starting point when the display panel receives the next frame of display data.

14. The display device according to claim 9, wherein, The backlight unit includes M groups of backlight partitions, and the controller is configured to: From the moment when the backlight data of the (K + 1)-th group of backlight partitions in the M groups of backlight partitions starts to be generated, within one frame time, sequentially provide the multiple groups of backlight data to the backlight driver. Wherein, M is a positive integer greater than or equal to 2, and K is a positive integer greater than 0 and less than (M - 1).

15. The display device according to claim 7, wherein The backlight data from the 1st group of backlight partitions to the (M - K)-th group of backlight partitions are respectively used as one group of backlight data; And The backlight data of each of the backlight partitions from the (M - K + 1)-th group to the M-th group are combined into one group of backlight data.

16. The display device according to claim 14, wherein The controller is configured to, when generating the local backlight control signal of the (i + K + 1)-th group of backlight partitions, provide the backlight data of the i-th group of backlight partitions to the backlight driver, so that the backlight driver drives the i-th group of backlight partitions, where i is a positive integer less than M - K + 1.

17. The display device according to any one of claims 14-16, wherein, K＝2。 18. The display device according to any one of claims 9-16, wherein, The controller is further configured to provide a synchronization signal to the backlight driver, wherein the synchronization signal is used to indicate that the controller starts to transmit the backlight data, and wherein the synchronization signal includes M effective pulse widths in each frame.

19. The display device according to claim 18, wherein, The controller provides the backlight data to the backlight driver at the active edge of each synchronization signal.

20. The display device according to claim 3, wherein, The backlight driver includes: a micro control unit and a storage unit, and the storage unit is used to store the backlight drive signals of the multiple backlight partitions respectively. Wherein, the micro control unit is configured to: Receive each group of backlight data provided by the controller; Judge the target backlight partition to which the local backlight control signal in each group of backlight data belongs according to the header; Obtain the global backlight drive signal; Based on the global backlight drive signal and the local backlight control signal, determine the target backlight drive signal of the target backlight partition; and Update the target backlight drive signal to the data address corresponding to the target backlight partition in the storage unit.

21. The display device according to claim 20, wherein, The backlight driver further includes a backlight drive chip, the backlight unit includes M groups of backlight partitions. The micro control unit is further configured to receive the synchronization signal provided by the controller and directly provide the synchronization signal to the backlight drive chip, wherein the synchronization signal includes M effective pulse widths in each frame, and the effective pulse width of the synchronization signal indicates the transmission of the backlight data. The micro control unit is further configured to, in response to the update of the target backlight drive signal to the data address, provide the multiple backlight drive signals stored in the storage unit to the multiple backlight drive chips at the active edge of the synchronization signal.

22. The display device according to claim 20, wherein, The micro control unit is further configured to: In response to the global backlight drive signal changing to an updated value, judge whether the duration of the updated value is greater than or equal to a preset threshold; and In response to the duration of the updated value being greater than or equal to the preset threshold, re-determine the target backlight drive signal based on the updated value and the local backlight control signal.

23. The display device according to claim 22, wherein, The micro control unit is configured to: receive each group of backlight data by means of direct memory access.

24. The display device according to claim 23, wherein, Each group of backlight data further includes: a chip select signal transmitted by a chip select signal line, and the backlight driver further includes a receive register and a storage register. Wherein, the backlight data is written into the receive register, and at the rising edge of the chip select signal, the backlight data in the receive register is written into the storage register and the receive register is cleared.

25. The display device according to claim 22, wherein, The global backlight drive signal is used to indicate the global duty ratio of multiple groups of backlight partitions.

26. The display device according to any one of claims 1-8, wherein, The local backlight control signal is used to indicate the local duty ratio of some of the multiple groups of backlight partitions.

27. The display device according to claim 1, wherein, The backlight unit includes light emitting diodes arranged in an array, and one or more rows of light emitting diodes form one group of the multiple groups of backlight partitions.

28. The display device according to claim 6, wherein, The display panel is coupled to the backlight unit, wherein the backlight unit is configured to provide a planar light source for the display of the display panel.

29. A method for adjusting the brightness of a backlight unit, wherein, The backlight unit includes multiple groups of backlight partitions, and the method includes: Generating multiple groups of backlight data in sequence according to a frame of image to be displayed, the multiple groups of backlight data are different, and each group of backlight data includes a local backlight control signal of some of the multiple groups of backlight partitions; and During a frame time, providing the multiple groups of backlight data to the backlight driver in sequence, and the backlight driver controls the brightness of the multiple groups of backlight partitions according to the local backlight control signals of the multiple groups of backlight data respectively.

30. The adjustment method according to claim 29, wherein, During a frame time, providing the multiple groups of backlight data to the backlight driver in sequence, including: Starting from generating the local backlight control signal of the (K + 1)-th group of backlight partitions among the M groups of backlight partitions, during a frame time, providing the multiple groups of backlight data to the backlight driver in sequence. Wherein, M is a positive integer greater than or equal to 2, and K is a positive integer greater than 0 and less than (M - 1).

31. The adjustment method according to claim 30, wherein, Starting from generating the local backlight control signal of the (K + 1)-th group of backlight partitions among the M groups of backlight partitions, during a frame time, providing the multiple groups of backlight data to the backlight driver in sequence, including: While obtaining the local backlight control signal of the (i + K)-th group of backlight partitions, providing the backlight data of the i-th group of backlight partitions to the backlight driver, where i is a positive integer less than M - K + 1.

32. The adjustment method according to claim 31, wherein The multiple groups of backlight data respectively include the local backlight control signals of different groups of backlight partitions among the multiple groups of backlight partitions.

33. The adjustment method according to claim 32, wherein, Each group of backlight data includes a data signal, the data signal includes a header and the local backlight control signal, the header is used to indicate the target group of backlight partitions among the multiple groups of backlight partitions to which the local backlight control signal included in the data signal belongs, and the headers of the multiple groups of backlight data are different from each other.

34. An electronic device, comprising: The display device according to any one of claims 1 to 28.

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