Display apparatus, brightness adjustment method, and electronic device

Abstract

A display apparatus, a brightness adjustment method, and an electronic device. The display apparatus comprises: a backlight unit comprising multiple backlight partitions; a backlight driver connected to the backlight unit, and configured to control the brightness of the multiple backlight partitions on the basis of respective backlight local area control signals of the multiple backlight partitions; and a controller connected to the backlight driver, and configured to: sequentially generate multiple sets of backlight data on the basis of an image frame to be displayed, wherein the multiple sets of backlight data are different, and each group of backlight data comprises the backlight local area control signals of some of the multiple backlight partitions; and sequentially provide the multiple sets of backlight data to the backlight driver within one frame duration. The display apparatus can reduce the delay of backlight refreshing and display picture refreshing.

Description

[0001] This application claims the priority and benefits of the Chinese Patent Applications No. 202311865124.1, which was filed on December 29, 2023, the disclosure of which is incorporated herein by reference in its entirety as part of the present application.TECHNICAL FIELD

[0002] The embodiments of the present disclosure relate to a display apparatus, a brightness adjustment method, and an electronic device.BACKGROUND

[0003] Local Dimming is a display technology, whose basic principle is to achieve brightness adjusted of a specific region on the screen by controlling the brightness of the LCD backlight.

[0004] Local dimming technology divides the backlight into a plurality of regions, and each of the regions can adjust the brightness independently to achieve brightness control in a specific region of the screen. For example, when the display needs to display deep black, local dimming technology can reduce the brightness or even turn off the backlight in the region, thereby improving black performance and contrast.SUMMARY

[0005] At least one embodiment of the present disclosure provides a display apparatus, which includes: a backlight unit, comprising a plurality of groups of backlight zones; a backlight driver, connected with the backlight unit, and configured to control brightness of the plurality of groups of backlight zones according to respective backlight local control signals of the plurality of groups of backlight zones; and a controller, connected with the backlight driver, and configured to: generate a plurality of groups of backlight data according to a frame of image to be displayed, at least one group of backlight data among the plurality of groups of backlight data is different from other groups of backlight data, and each of the groups of backlight data comprises one or more of the backlight local control signals of a part of groups of backlight zones among the plurality of groups of backlight zones; and within one frame time, sequentially provide the plurality of groups of backlight data to the backlight driver.

[0006] For example, in the display apparatus provided by some embodiments of the present disclosure, the plurality of groups of backlight data are different from each other; the plurality of groups of backlight data respectively comprises the backlight local control signals of different groups of backlight zones among the plurality of groups of backlight zones.

[0007] For example, in the display apparatus provided by some embodiments of the present disclosure, each of the groups of backlight data comprises a data signal, the data signal comprises a header and the backlight local control signal, the header is used to indicate a target backlight zone group among the plurality of groups of backlight zones to which the backlight local control signal comprised in the data signal belongs, and headers of the plurality of groups of backlight data are different from each other.

[0008] For example, in the display apparatus provided by some embodiments of the present disclosure, the data signal further comprises a command, the command is used to indicate whether the data signal comprises the backlight local control signal.

[0009] For example, in the display apparatus provided by some embodiments of the present disclosure, the controller is connected with the backlight driver by a peripheral interface, and the plurality of groups of backlight data are transmitted by the peripheral interface.

[0010] For example, in the display apparatus provided by some embodiments of the present disclosure, the display apparatus further comprises a display panel, a time duration between a moment when display data received by the display panel switches from a first frame to a second frame and a moment when a duty cycle of a cathode or an anode of the backlight unit switches from the first frame to the second frame is less than 1.23 times a length of one frame time.

[0011] For example, in the display apparatus provided by some embodiments of the present disclosure, the time duration between the moment when the display data received by the display panel switches from the first frame to the second frame and the moment when the duty cycle of the cathode or the anode of the backlight unit switches from the first frame to the second frame is less than or equal to 0.55 times the length of one frame time.

[0012] For example, in the display apparatus provided by some embodiments of the present disclosure, the time duration from the moment when the display data received by the display panel switches from the first frame to the second frame to the moment when the duty cycle of the cathode or the anode of the backlight unit switches from the first frame to the second frame is 0.35 to 0.55 times the length of one frame time.

[0013] For example, in the display apparatus provided by some embodiments of the present disclosure, the backlight unit comprises M groups of backlight zones, and the controller is configured to: in one frame time, provide N groups of backlight data sequentially to the backlight driver, where M is a positive integer greater than or equal to 2, and 2 ≤ N ≤ M.

[0014] For example, in the display apparatus provided by some embodiments of the present disclosure, M is a positive integer greater than or equal to 3, N<M, data volume of the N-th group of backlight data is greater than data volume of each of the other groups, and the N-th group of backlight data is the last group of backlight data within the one frame time.

[0015] For example, in the display apparatus provided by some embodiments of the present disclosure, N=M-1.

[0016] For example, in the display apparatus provided by some embodiments of the present disclosure, N=M-P, and the data volume of the N-th group of backlight data is (P+1) times the data volume of each of the other groups.

[0017] For example, in the display apparatus provided by some embodiments of the present disclosure, a starting point of the one frame time is a starting point when the display panel receives one frame of display data, and an ending point of the one frame time is a starting point when the display panel receives a next frame of display data.

[0018] For example, in the display apparatus provided by some embodiments of the present disclosure, the backlight unit comprises M groups of backlight zones, and the controller is configured to: from the moment when the backlight data of the (K+1)-th group of backlight zones in the M groups of backlight zones is generated, the plurality of groups of backlight data are sequentially provided to the backlight driver within one frame time, 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).

[0019] For example, in the display apparatus provided by some embodiments of the present disclosure, the backlight data from the first group of backlight zones to the (M-K)-th group of backlight zones are regarded as respective groups of backlight data; and the backlight data of the backlight zones from the (M-K+1)-th group to the M-th group are combined into one group of backlight data.

[0020] For example, in the display apparatus provided by some embodiments of the present disclosure, the controller is configured to provide backlight data of the i-th group of backlight zones to the backlight driver at the same time as the backlight local control signal of the (i+K+1)-th group of backlight zones is generated, so that the backlight driver drives the i-th group of backlight zones, wherein i is a positive integer less than M-K+1.

[0021] For example, in the display apparatus provided by some embodiments of the present disclosure, K=2.

[0022] For example, in the display apparatus provided by some embodiments of the present disclosure, the controller is further configured to provide a synchronization signal to the backlight driver, the synchronization signal is used to instruct the controller to start transmitting the backlight data, and the synchronization signal comprises M effective pulse widths in each frame.

[0023] For example, in the display apparatus provided by some embodiments of the present disclosure, the controller provides the backlight data to the backlight driver at each valid edge of the synchronization signal.

[0024] For example, in the display apparatus provided by some embodiments of the present disclosure, the backlight driver comprises: a micro control unit and a storage unit, the storage unit is configured to store backlight driving signals of the plurality of backlight zones, the micro control unit is configured to: receive each of the groups of backlight data provided by the controller; determine a target backlight zone to which the backlight local control signal in each of the groups of backlight data belongs according to the header; obtain a global backlight drive signal; determine a target backlight driving signal of the target backlight zone based on the global backlight driving signal and the backlight local control signal; and update the target backlight driving signal to data address corresponding to the target backlight zone in the storage unit.

[0025] For example, in the display apparatus provided by some embodiments of the present disclosure, the backlight driver further comprises a backlight driving chip, and the backlight unit comprises M groups of backlight zones, 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 comprises M effective pulse widths in each frame, and the effective pulse widths of the synchronization signal indicate the backlight data transmission, and 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 a valid edge of the synchronization signal in response to the target backlight driving signal being updated to the data address.

[0026] For example, in the display apparatus provided by some embodiments of the present disclosure, the micro control unit is further configured to: in response to the global backlight driving signal changing to an updated value, determine whether a duration of the updated value is greater than or equal to a preset threshold; and in response to a duration of the updated value being greater than or equal to the preset threshold, re-determine the target backlight driving signal based on the updated value and the backlight local control signal.

[0027] For example, in the display apparatus provided by some embodiments of the present disclosure, the micro control unit is configured to receive each of the groups of backlight data by direct memory access.

[0028] For example, in the display apparatus provided by some embodiments of the present disclosure, each of the groups of backlight data further comprises: a chip selection signal transmitted by a chip selection signal line, and the backlight driver further comprises a receiving register and a storage register, the backlight data is written into the receiving register, and at a rising edge of the chip selection signal, the backlight data in the receiving register is written into the storage register, and the receiving register is cleared.

[0029] For example, in the display apparatus provided by some embodiments of the present disclosure, the global backlight driving signal is used to indicate the global duty cycle of the plurality of groups of backlight zones.

[0030] For example, in the display apparatus provided by some embodiments of the present disclosure, the backlight local control signal is used to indicate local duty cycles of part of backlight zones in the plurality of groups of backlight zones.

[0031] For example, in the display apparatus provided by some embodiments of the present disclosure, the backlight unit comprises light-emitting diodes arranged in an array, and one or more rows of light-emitting diodes serve as one of the plurality of groups of backlight zones.

[0032] For example, in the display apparatus provided by 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 display of the display panel.

[0033] At least one embodiment of the present disclosure further provides a brightness adjustment method of a backlight unit, the backlight unit comprises a plurality groups of backlight zones, and the method comprises: sequentially generating 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 of the groups of backlight data comprises backlight local control signals of part of backlight zones in the plurality of groups of backlight zones; and providing the plurality of groups of backlight data to a backlight driver in sequence within one frame time, and controlling brightness of the plurality of groups of backlight zones according to respective backlight local control signals of the plurality of groups of backlight data by the backlight driver.

[0034] For example, in the adjustment method provided by some embodiments of the present disclosure, providing the plurality of groups of backlight data to the backlight driver in sequence within one frame time comprises: starting from generating a backlight local control signal of the (K+1)-th group of backlight zones in the M groups of backlight zones, sequentially providing the plurality of groups of backlight data to the backlight driver within one frame time, where M is a positive integer greater than or equal to 2, and K is a positive integer greater than and less than (M-1).

[0035] For example, in the adjustment method provided by some embodiments of the present disclosure, starting from generating the backlight local control signal of the (K+1)-th group of backlight zones in the M groups of backlight zones, sequentially providing the plurality of groups of backlight data to the backlight driver within one frame time comprises: providing the backlight data of the i-th group of backlight zones to the backlight driver at the same time as the backlight local control signal of the (i+K)-th group of backlight zones is acquired, wherein i is a positive integer less than M-K+1.

[0036] For example, in the adjustment method provided by some embodiments of the present disclosure, the plurality of groups of backlight data respectively comprises the backlight local control signals of different groups of backlight partition among the plurality of groups of backlight zones.

[0037] For example, in the adjustment method provided by some embodiments of the present disclosure, each of the groups of backlight data comprises a data signal, the data signal comprises a header and the backlight local control signal, the header is used to indicate a target backlight zone group among the plurality of groups of backlight zones to which the backlight local control signal comprised in the data signal belongs, and headers of the plurality of groups of backlight data are different.

[0038] At least one embodiment of the present disclosure further provides an electronic device, which includes the display apparatus according to any one of the embodiments.BRIEF DESCRIPTION OF DRAWINGS

[0039] To more clearly illustrate the technical solutions of the embodiments of the present disclosure, the accompanying drawings of the embodiments are briefly described below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure and do not limit the present disclosure. Fig. 1A is a schematic diagram of a backlight unit; Fig. 1B shows a schematic diagram of a display apparatus provided by at least one embodiment of the present disclosure; Fig. 1C is an exemplary system structure diagram of the display apparatus shown in Fig. 1B provided by at least one embodiment of the present disclosure; Fig. 2 is a schematic diagram showing an SPI signal provided by a full-frame SPI according to at least one embodiment of the present disclosure; Fig. 3A to Fig. 3G are schematic diagrams showing a plurality of data packets provided to a backlight driver according to at least one embodiment of the present disclosure; Fig. 4 is a schematic diagram showing the delay time of backlight zones provided by an embodiment of the present disclosure; Fig. 5A shows a flow chart of a method for calculating brightness control signals of each of the backlight zones provided by at least one embodiment of the present disclosure; Fig. 5B shows a flow chart of a method for updating a PWM value provided by at least one embodiment of the present disclosure; Fig. 6A shows a signal timing diagram of a controller generating backlight data for all backlight zones and then sending the backlight data; Fig. 6B shows a timing diagram of signals generated and sent by a controller provided by at least one embodiment of the present disclosure; and Fig. 7 is a flow chart of a method for adjusting the brightness of a backlight unit provided by some embodiments of the present disclosure. DETAILED DESCRIPTION

[0040] 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 is described clearly and completely below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are a part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative efforts shall fall within the protection scope of the present disclosure.

[0041] Unless otherwise defined, the technical or scientific terms used in the present disclosure are understood in their ordinary sense by a person with ordinary skill in the field to which this disclosure pertains. The terms such as "first" and "second" used in the present disclosure do not denote any order, quantity, or importance, but are merely used to distinguish between different components. Similarly, terms such as "a", "an", or "the" do not denote a limitation on quantity, but indicate the presence of at least one. Terms such as "include" or "comprise" mean that the element or item preceding the term covers the element or item listed after the term and their equivalents, without excluding other elements or items. Terms such as "connect" or "be connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "upper", "lower", "left", and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] The present disclosure is explained below by way of several specific embodiments. To keep the following description of the embodiments of the present disclosure clear and concise, the detailed descriptions of known functions and known components may be omitted. When any component of the embodiments of the present disclosure appears in more than one drawing, the component is denoted by the same or similar reference numerals in each drawing.

[0043] The liquid crystal panel generally includes an array substrate and an opposing substrate (such as a color filter substrate) disposed opposite to each other to form a liquid crystal cell, and a liquid crystal layer is filled between the array substrate and the opposing substrate in the liquid crystal cell. A first polarizer is arranged on the array substrate, and a second polarizer is arranged on the opposing substrate. The polarization directions of the first polarizer and the second polarizer are perpendicular to each other. The backlight unit is provided on a 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 the driving electric field formed between a pixel electrode provided on the array substrate and a common electrode provided on the array substrate or the common electrode provided on the opposing substrate, liquid crystal molecules of the liquid crystal layer are twisted, thereby controlling the polarization direction of light passing through the liquid crystal layer, and controlling the transmittance of light in cooperation with the first polarizer and the second polarizer, so as to achieve grayscale display.

[0044] The backlight unit may be a direct-lit backlight unit or an edge-lit backlight unit. The direct-lit backlight unit includes a plurality of point light sources (such as light emitting diodes (LEDs)) arranged in parallel and a diffusion plate, and the light emitted by these point light sources is uniformed by the diffusion plate and then incident on a liquid crystal panel for display.

[0045] Currently, for example, high-resolution LCD panels are gradually being used in VR apparatuses. During the process of using the VR devices, because the human eye is closer to the display screen, it is easier to perceive the display effect of the displayed image, so the requirements for panel resolution and display quality are becoming higher and higher.

[0046] For example, for a liquid crystal panel, a local dimming technology (LD) can be used to control the direct-lit backlight unit, thereby improving the display quality of the panel. The local dimming technology not only can reduce the power consumption of the panel, but also can realize dynamic dimming of the backlight region, greatly improving the contrast of the display image and enhancing the display quality of the panel.

[0047] Local dimming technology can divide the entire backlight unit into a plurality of independently drivable backlight zones (Blocks), each of which includes one or more LEDs. The driving current of the LEDs in the backlight zones corresponding to the zones is automatically adjusted according to the grayscales that need to be displayed in different parts of the display image, so that the brightness of each of the zones in the backlight unit can be adjusted separately, thereby improving the contrast of the display image.

[0048] For example, in an exemplary direct-lit backlight unit, a schematic diagram of the zone division of the LED light source in the entire backplane is shown in Fig. 1A, where a small square represents an LED unit, and a plurality of zones separated by dotted lines represent a plurality of backlight zones. Each of the backlight zones includes one or more LED units and can be controlled independently of other backlight zones. For example, the plurality of LEDs in each of the backlight zones are linked, that is, the currents passing through the plurality of LEDs in the same backlight zone are consistent, so that the light emitting brightness is basically consistent. Pulse Width Modulation (PWM) technology modulates the width of a series of pulses to equivalently obtain the required waveform. PWM is a method of digitally encoding the levels of an analog signal. Through the use of 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 can be controlled by adjusting the duty cycle within a PWM cycle, and the brightness (intensity) of the LED can be controlled by changing the proportion of high and low levels in a cycle. For example, in one cycle, the greater the proportion of the low level, the brighter the luminous intensity.

[0049] With the development of local dimming technology, the processing time of the dimming algorithm becomes longer due to the increase in the amount of backlight zones and the need for fine control, resulting in longer delays of backlight refresh and display screen refresh, affecting the display effect of the picture and causing screen flickering and other phenomena.

[0050] At least one embodiment of the present disclosure provides a display apparatus. The display apparatus includes a backlight unit, a backlight driver, and a controller. The backlight unit includes a plurality of groups of backlight zones. For example, the display apparatus may be a liquid crystal display or a liquid crystal display module. For example, a basic structure of a liquid crystal display module includes four parts: a liquid crystal display screen and its driving circuit system, a backlight source (also called a "backlight unit") and its driving circuit. The display screen cut from the box process that has not yet been attached with polarizers and bound and connected with driving circuit components is called a bare LCD box, and the display screen that is attached with polarizers and bound and connected with driving circuit components is called an Open Cell (OC). The combination of OC, backlight source and its driving circuit is called a liquid crystal display module. The driving circuit of the backlight source includes, for example, the above-mentioned backlight driver and controller. A plurality of groups of backlight zones can be driven individually, each of the groups of backlight zones includes one or more LEDs.

[0051] The backlight driver is connected with the backlight unit and is configured to control brightness of the plurality of groups of backlight zones according to respective backlight local control signals of the plurality of groups of backlight zones. The controller is connected with the backlight driver and is configured to 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 of the groups of backlight data includes backlight local control signals of part of groups of backlight zones among the plurality of groups of backlight zones, within one frame time, the plurality of groups of backlight data are sequentially provided to the backlight driver.

[0052] 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 taken as a group of backlight zones. Fig. 1B shows a schematic diagram of a display apparatus provided by at least one embodiment of the present disclosure.

[0053] As shown in Fig. 1B, the display apparatus 100 includes a backlight unit 101, a backlight driver 102, and a controller 103,

[0054] The backlight unit 101 includes a plurality of groups of backlight zones. The backlight driver 102 is connected with the backlight unit 101 and is configured to control the brightness of the plurality of backlight zones according to the respective backlight local control signals of the plurality of backlight zones. The controller 103 is connected with the backlight driver 102 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, each of the groups of backlight data includes the backlight local control signals of some groups of backlight zones among the plurality of groups of backlight zones, and the plurality of groups of backlight data are provided to the backlight driver in sequence within one frame time. The backlight unit 101, the backlight driver 102 and the controller 103 are described below in conjunction with Fig. 1C,

[0055] Fig. 1C is an exemplary system structure diagram of the display apparatus 100 shown in Fig. 1B provided by at least one embodiment of the present disclosure. For example, the display apparatus 100 is implemented by a hardware circuit in this example. As shown in Fig. 1C, the system structure includes, for example, a direct current power supply 10, a first control apparatus 11, a second control apparatus 12, and an LED driving circuit board 13 for driving an LED to emit light. The first control apparatus 11 may be, for example, a timer control register (TCON) and / or a system on chip (SOC). For example, in the example of Fig. 1B, a system on chip is used as the first control apparatus 11. The second control apparatus 12 may include, for example, at least one of a Field-Programmable Gate Array (FPGA), a SOC, and a TCON. The LED driving circuit board 13 is an example of the backlight driver 102.

[0056] As shown in Fig. 1C, the LED driving circuit board 13 is connected with the backlight unit, and the backlight unit includes LEDs of various backlight zones.

[0057] In some examples of the present disclosure, the LED driving circuit board 13 may 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 the image signal to obtain backlight brightness data after processing of each backlight zone, and based on the backlight brightness data, driving currents for different backlight zones are generated, and the driving currents are output to corresponding backlight zones, so as to control the LEDs in the backlight zones to emit light through the currents, that is, the brightness of the M groups of backlight zones is controlled by current.

[0058] In some embodiments of the present disclosure, for example, the second control apparatus 12 in Fig. 1C serves as a controller 103, and the controller 103 is electrically connected with the LED driving circuit board 13.

[0059] The MCU 131 receives the backlight local control signal (Local Dimming SPI (Serial Peripheral Interface)) from the second control apparatus 12, and performs an AND operation with the brightness modulation signal (PMW) from the first control apparatus 11 (the enable signal (BL_EN) controls whether the AND operation is performed), and obtains the brightness control signal of each of the backlight zones, then, the MCU 131 outputs these brightness control signals to the LED integrated circuit driver chip 132 to control the current of the LEDs of each of the backlight zones, thereby controlling the light emitting brightness of each of the backlight zones. For example, the second control apparatus 12 and the first control apparatus 11 may be implemented by using one TCON, for example, the backlight local control signal and the brightness modulation signal may both be implemented by the TCON, and the embodiments of the present disclosure are not limited to this.

[0060] In some embodiments of the present disclosure, the backlight driver 102 and the controller 103 may be integrated, that is, the backlight driver 102 and the controller 103 may be different modules of the same integrated circuit, and the backlight driver 102 and the controller 103 are in communication connection.

[0061] In some embodiments of the present disclosure, the backlight local control signal is used to indicate the local duty of part of backlight zones in the plurality of groups of backlight zones. The brightness modulation signal is used as a global backlight driving signal, and the global backlight driving signal is used to indicate the global duty cycle of the plurality of groups of backlight zones, for example, a PWM signal provided by a system on chip SOC.

[0062] In some embodiments of the present disclosure, for example, the backlight unit includes M groups of backlight zones, and the controller, for example, the second control apparatus 12, is configured to sequentially generate a plurality of groups of backlight data according to a frame of image to be displayed. Each of the groups of backlight data includes backlight local control signals of part of groups of backlight zones, and starting from generating backlight local control signals of the (K+1)-th group of backlight zones in the M groups of backlight zones, in one frame time, a plurality of 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 positive integer greater than or equal to 0 and less than (M-1). In this embodiment, the backlight data is provided to the backlight driver from the (K+1)-th group, and there is no need to obtain the backlight local control signals of all the backlight zones, thereby reducing the delay between backlight refresh and display screen refresh.

[0063] For example, starting from generating the backlight local control signal of the third group of backlight zones, the controller sequentially provides a plurality of groups of backlight data to the LED driving circuit board 13.

[0064] For example, firstly, according to the image data of the first group and the second group of the zones, the backlight local control signals of the first group and the second group of zones are calculated by spatial and temporal filtering, after the calculation of the first two groups of data is completed, the first group of backlight data is sent through SPI starting from the third group, while sending the first group of backlight data, the third group of backlight data and spatial time filtering are calculated, after the calculation is completed, the fourth group starts to send the data of the 2nd group via SPI, and so on.

[0065] It should be noted that, although in the above embodiment the controller starts to calculate and send from the third group, this does not have a limiting effect on the present disclosure. For example, the controller may start calculating and sending from the second group. That is, firstly, the backlight local control signal of the first group is calculated according to the image data of the first group of zones, after the calculation of the first group of data is completed, the first group of backlight data is sent through SPI starting from the second group, while sending the first set of backlight data, the second group of backlight data and spatial-temporal filtering are calculated, after the calculation is completed, the third group starts to send the data of the second group via SPI, and so on. Those skilled in the art may also configure the controller to start calculating and sending from the fourth group, and the present disclosure does not limit the group from which the controller starts calculating and sending.

[0066] After the controller obtains at least the backlight local control signals of the first group of zones and the second group of zones, it sends the first group of backlight data, so that the backlight local control signals of the first group of zones and the second group of zones can be comprehensively considered, which reduces the impact of the backlight local control signals of the second group on the backlight local control signals of the first group.

[0067] For example, the system for local dimming drivingis powered by an external DC power supply 10, and the power supply voltage Vin is generally 24 volts (V). For example, the DC / DC circuit 133 may use a voltage conversion circuit (for example, a Boost circuit) to boost the supply voltage Vin to a driving voltage required to light up the LEDs of each of the backlight zones.

[0068] Because a small fluctuation in the operating voltage of the LED can cause a large change in the current on the LED, the LED in this system can be dimmed using a constant current control method. To achieve constant current control, the cathodes (LED-) of the plurality of LEDs connected in series in the backlight zone are connected to the current sampling circuit 134 to monitor the current stability of the driven LEDs in real time. The current sampling circuit 134 converts the current flowing through the LED 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, and after receiving the control signal, the DC / DC circuit 133 adjusts the output voltage input to the LED anode (LED+), thereby achieving a current stabilization effect on the LED. For example, the converted voltage signal is sampled, and the sampled voltage is 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 make the DC / DC circuit 133 reduce the output voltage, thereby reducing the current flowing through the LED; on the contrary, the current sampling circuit 134 can output another control signal to make the DC / DC circuit 133 increase the output voltage to increase the current flowing through the LED. That is, the circuit sampling circuit 134 can be used as a negative feedback circuit to achieve constant current control of the LED, so that the LED can work stably.

[0069] It should be noted that, in some embodiments of the present disclosure, the amount of the plurality of groups of backlight data and the amount of the plurality of groups of backlight zones may be the same or different. For example, two groups of backlight data of backlight zones may be combined into one group of backlight data.

[0070] In some embodiments of the present disclosure, the plurality of groups of backlight data are different from each other, and the plurality of groups of backlight data respectively include backlight local control signals of different backlight zone groups among the plurality of groups of backlight zones. For example, the plurality of groups of backlight data correspond one to one with the plurality of groups of backlight local control signals of backlight zones. For example, the first group of backlight data corresponds to the backlight local control signal of the first group among the plurality of groups of backlight zones, the second backlight data corresponds to the backlight local control signal of the second group among the plurality of groups of backlight zones, and so on. For another example, at least part of the backlight data in the plurality of groups of backlight data includes backlight local control signals of at least two groups of backlight zones. For example, the first group of backlight data includes the backlight local control signal of the first group among the plurality of groups of backlight zones, and the seventh group of backlight data includes the backlight local control signals of the seventh group and the eighth group of backlight zones among the plurality of groups of backlight zones.

[0071] In some embodiments of the present disclosure, the controller is configured to provide the backlight data of the i-th row of backlight zones to the backlight driver while acquiring the backlight local control signal of the (i+K)-th row of backlight zones, so that the backlight driver drives the i-th row of backlight zones, where i is a positive integer less than M-K+1.

[0072] 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 the plurality of groups of backlight zones. The above embodiment is described below by taking each row of LEDs as a group of backlight zones as an example.

[0073] For example, K=2, M=8, for example, firstly, 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 backlight local control signals of the first group of backlight zones and the second group of backlight zones are calculated by spatial and temporal filtering. After the calculation of the first two groups of backlight partition data 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, and while sending the backlight data of the first group of backlight zones, the backlight data and spatial-temporal filtering of the third group of backlight zones are calculated. After the calculation is completed, the backlight data of the second group of backlight zones is sent, and at the same time, the backlight data and spatial-temporal filtering of the fourth group of backlight zones is calculated. After the calculation is completed, the backlight data of the third group of backlight zones is sent, and at the same time, the backlight data of the fifth group of backlight zones is calculated and spatial-temporal filtering is performed. After the calculation is completed, the backlight data of the fourth backlight zone is sent, and at the same time, the backlight data of the sixth backlight zone is calculated and spatial-temporal filtering is performed. After the calculation is completed, the backlight data of the fifth backlight zone is sent, and at the same time, the backlight data of the seventh backlight zone is calculated and spatial-temporal filtering is performed.. After the calculation is completed, the backlight data of the sixth group of backlight zones is sent, and at the same time the backlight data of the eighth group of backlight zones is calculated and spatial-temporal filtering is performed.

[0074] For example, the backlight unit includes M groups of backlight zones, and the controller is configured to provide N groups of backlight data to the backlight driver in sequence within one frame time, and M is a positive integer greater than or equal to 2, and 2≤N≤M. For example, or M=8, N=6, etc.

[0075] In some embodiments of the present disclosure, M is a positive integer greater than or equal to 3, N<M, the amount of data of the N-th group of backlight data is greater than the amount of backlight data of each of the other groups, and the N-th group of backlight data is the last group of backlight data within a frame time.

[0076] For example, there are 8 backlight zones, and the 8 backlight zones are 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 are not limited to M=8, N=7, and the above example is only one implementation method and has no limiting effect on the present disclosure.

[0077] For example, the backlight data from the first group of backlight zones to the (M-K)-th group of backlight zones are regarded as respective groups of backlight data; and the backlight data from the (M-K+1)-th group of backlight zones to the M-th group of backlight zones are respectively combined into one group of backlight data.

[0078] For example, in the above example of K=2, M=8, the backlight data from the first group of backlight zones to the sixth group of backlight zones are regarded as respective groups of backlight data, and the backlight data from the seventh group of backlight zones and the eighth group of backlight zones are combined into one group of backlight data.

[0079] For example, while sending the backlight data of the sixth group of backlight zone, the backlight data of the eighth group of backlight zone is calculated and the spatial-temporal filtering is performed. After the calculation is completed, the backlight data of the seventh group of backlight zones and the eighth group of backlight zones are packaged into a group of backlight data and provided to the LED driving circuit board 13, and packing the backlight data of the seventh group of backlight zones and the eighth group of backlight zones into one group of backlight data can reduce the amount of sending times.

[0080] In some other embodiments of the present disclosure, the backlight data of the seventh group of backlight zones and the backlight data of the eighth group of backlight zones may also be sent independently, that is, the backlight data of the seventh group of backlight zones are sent as one data packet, and the backlight data of the eighth group of backlight zones are sent as another data packet, which can reduce the time of DMA data transmission.

[0081] In some embodiments of the present disclosure, N=M-P, and the data volume of the N-th group of backlight data is (P+1) times the data volume of each of the other groups. For example, the backlight data of each of the first M-P-1 backlight zones is taken as a group of backlight data, and the backlight data of each of the last (P+1) backlight zones is taken as the last group of backlight data, and the amount of backlight data 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 zones into a group of backlight data can reduce the delay and the amount of times the backlight data is sent.

[0082] In some embodiments of the present disclosure, the starting point of a frame time is the starting point when the display panel receives a frame of display data, and the end point of a frame time is the starting point when the display panel receives the next frame of display data.

[0083] In some embodiments of the present disclosure, the controller is connected to the backlight driver via a peripheral interface. For example, in the structure of Fig. 1C, the second control apparatus 12 is connected with the MCU via a peripheral interface, and the peripheral interface is, for example, the above-mentioned SPI interface. The SPI interface includes three logic lines, namely a data signal line for transmitting a data signal, a clock signal line for transmitting a clock signal, and a chip selection signal line.

[0084] For example, each backlight data includes a data signal, a clock signal, and a chip selection signal. The data signal includes the header and the backlight local control signal, the header is used to indicate a target backlight zone group among the plurality of groups of backlight zones to which the backlight local control signal included in the data signal belongs, and the headers of the plurality of groups of backlight data are different from each other.

[0085] For example, the header is used to indicate which backlight zone among the plurality of groups of backlight zones the backlight local control signal included in the data signal belongs to. For example, the value of the header is 0x0FF8, which indicates the first group of zones; the value of the header is 0x1FF8, which indicates the second group of zones; the value of the header is 0x2FF8, which indicates the third group of zones; the value of the header is 0x3FF8, which indicates the fourth group of zones; the value of the header is 0x4FF8, which indicates the fifth group of zones; the value of the header is 0x5FF8, which indicates the sixth group of zones; the value of the header is 0x6FF8, which indicates the seventh group of zones. The value of the header is 0x8FF8, which indicates the eighth group of zones. The header can be used to determine which backlight zone the backlight local control signal in the backlight data belongs to.

[0086] In some embodiments of the present disclosure, the data signal includes not only the header and the backlight local control signal but also a command, where the command is used to indicate whether the data signal includes the backlight local control signal or not.

[0087] For example, if the value of Command is 0xFFFC, it means that the backlight data includes a backlight local control signal.

[0088] For example, some embodiments of the present disclosure provide a data signal protocol, the format of which is a header (Indicator) + a command (Command) + a backlight local control signal. The backlight local control signal in the data signal is used to control the brightness of which backlight partition through the header, and the command is used to determine whether the data signal is a correct data signal carrying a backlight local control signal. The backlight local control signal is used to indicate the local duty cycle of the backlight zone.

[0089] In some embodiments of the present disclosure, the controller is connected with the backlight driver via a peripheral interface (for example, SPI).

[0090] Fig. 2 is a schematic diagram showing an SPI signal provided by a full-frame SPI according to at least one embodiment of the present disclosure.

[0091] As shown in Fig. 2, the SPI signal includes data signal D, chip selection signal CS, and clock signal CK.

[0092] The clock signal CK is used to synchronize the transmitting end (for example, the controller) and the receiving end (for example, the LED driving circuit board 13).

[0093] The controller starts to send the data signal D at the falling edge of the chip selection signal CS, and provides the data signal D during the inactive level (for example, low level) of the chip selection signal CS. In some embodiments of the present disclosure, the LED driving circuit board 13 initializes the SPI signal at the rising edge of the chip selection signal CS.

[0094] The data signal D includes the header, command and backlight local control signal of each group. As shown in Fig. 2, if K=2, the controller provides the first group of backlight data to the LED driver circuit board 13 after calculating the backlight data of the second row; after the calculation of the backlight data of one frame is completed, the last two groups of backlight data are provided to the LED driving circuit board 13.

[0095] It should be noted that the present disclosure does not limit the specific values of the headers, the commands and the meanings corresponding to the values, and those skilled in the art can design the specific values and meanings of the headers and commands on their own.

[0096] Fig. 3A to Fig. 3G are schematic diagrams showing a plurality of data packets provided to a backlight driver according to at least one embodiment of the present disclosure.

[0097] In the examples of Fig. 3A to Fig. 3G, the controller communicates with the backlight driver via SPI. As shown in Fig. 3A to Fig. 3G, SPI communication includes three logic lines, namely a data signal line DT, a chip selection signal line CS', and a clock signal line CLK.

[0098] In the low level phase of the chip selection 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 the header and the command are both 16 bits, the transmission of the header and the command requires 16 clock cycles respectively. In some examples of the present disclosure, for example, the backlight unit is an 8×8 LED array, each row of LEDs is used as a group of backlight zones, that is, each group of backlight zones includes 8 LEDs, if the backlight local control signal of each LED is 16 bits, the backlight local control signal of each LED needs 16 clock cycles to be transmitted.

[0099] As shown in Fig. 3A, the value of the second 16 clock cycles is 0XFFFC, which indicates that the data packet is correct backlight data, and the value of the first 16 clock cycles in the data packet is 0X0FF8, which means that the backlight data includes the backlight local control signal of the first group of backlight zones. The data includes 0X0001, 0X0002, 0X0003, 0X0004, 0X0005, 0X0006, 0X0007, and 0X0008, which are backlight local control signals for each of the plurality of LEDs in the first row. It should be noted that 0X0001, 0X0002, 0X0003, 0X0004, 0X0005, 0X0006, 0X0007, and 0X0008 are only examples and have no limiting effect on the present disclosure, in actual use, these backlight local control signals are determined according to the brightness required for each frame. Fig. 3B to Fig. 3G are similar to Fig. 3A.

[0100] Similarly, the header of Fig. 3B is 0X1FF8 and the command is 0XFFFC, and the data packet shown in Fig. 3B is the backlight local control signal of the second group of backlight zones, that is, the data signal after the command 0XFFFC is the backlight local control signal of the second group of backlight zones.

[0101] The header of Fig. 3C is 0X2FF8, and the command is 0XFFFC, and the data packet shown in Fig. 3C includes the backlight local control signal of the third group of backlight zones, that is, the data signal following the command 0XFFFC is the backlight local control signal of the third group of backlight zones.

[0102] The header of Fig. 3D is 0X3FF8, and the command is 0XFFFC. The data packet shown in Fig. 3D includes the backlight local control signal of the fourth backlight zone, that is, the data signal following the command 0XFFFC is the backlight local control signal of the fourth group of backlight zones.

[0103] The header of Fig. 3E is 0X4FF8, and the command is 0XFFFC. The data packet shown in Fig. 3E includes the backlight local control signal of the fifth backlight zone, that is, the data signal following the command 0XFFFC is the backlight local control signal of the fifth backlight zone.

[0104] The header of Fig. 3F is 0X5FF8, and the command is 0XFFFC. The data packet shown in Fig. 3F includes the backlight local control signal of the sixth backlight zone, that is, the data signal following the command 0XFFFC is the backlight local control signal of the sixth backlight zone.

[0105] Fig. 3G is a data packet of backlight data of the seventh row backlight zone and the eighth row backlight zone, as shown in Fig. 3G, the data packet includes a header 0X6FF8, indicating that the backlight local control signal after the header 0X6FF8 is the backlight data of the seventh backlight zone, 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 zones.

[0106] 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 instruct the start of transmitting the backlight data.

[0107] Regarding the synchronization signal, in some examples, a synchronization signal Vsync is sent once per frame (for example, an effective pulse width of a synchronization signal per frame), and the backlight driver outputs it at an 8-fold frequency. The specific method is to capture the synchronization signal Vsync frequency once each time the machine is turned on, and compare it with the default frequency. If it is consistent with the default frequency, the default frequency (such as 60hz 8 times, 480hz) is directly output, and if it is inconsistent with the default frequency, a new 8-fold frequency is obtained by looking up the table and output. The effective pulse width is, for example, a high level period of the synchronization signal.

[0108] In some embodiments of the present disclosure, the synchronization signal includes M effective pulse widths in each frame. That is, the amount of effective pulse widths of the synchronization signal is the same as the amount of backlight zones. For example, the controller sends 8 synchronization signals Vsync, and the backlight driver can directly output the synchronization signal Vsync after receiving it, so as to provide a synchronization signal to the backlight driver chip (for example, the LED integrated circuit driver chip 132 in Fig. 1C), which improves data synchronization accuracy and reduces the execution time of the backlight driver.

[0109] In the present embodiment, the backlight data is refreshed 8 times within one frame time, and a group of the latest backlight data is added each time, and 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 receiving a frame of data, the backlight driver outputs the frame of backlight data at a speed 8 times the frequency, although each frame is refreshed 8 times, the same data is repeated 8 times, and the backlight response time is delayed by about 1.25 frames, therefore, this solution effectively improves the backlight response speed.

[0110] For example, the data provided by the controller to the backlight driver is acquired by detecting the pins of the SPI interface connecting the controller and the backlight driver, and the display data received by the controller is acquired by detecting the input pins of the controller.

[0111] In some embodiments of the present disclosure, the display apparatus 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 display of the display panel. The time duration between the moment when the display data received by the display panel switches from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit switches from the first frame to the second frame is less than 1.23 times the time duration of one frame. In this example, the time duration between the moment when the display data received by the display panel switches from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit switches 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 refers to the moment when the duty cycle corresponding to the first frame is switched to the duty cycle corresponding to the second frame.

[0112] In some embodiments of the present disclosure, if the LEDs of the backlight unit are connected in such a manner that the LED anodes are used as the common terminals, then the anode signal of the anode of the backlight unit is detected. The time duration from the moment when the display data is switched from the first frame to the second frame to the moment when the duty ratio of the anode signal is switched from the first frame to the second frame is less than 1.23 times the time duration of one frame. If the LEDs of the backlight unit are connected in such a way that the LED cathodes are used as the common terminals, the cathode signal of the anode of the backlight unit is detected. The time duration from the moment when the display data is switched from the first frame to the second frame to the moment when the duty ratio of the anode signal is switched from the first frame to the second frame is less than 1.23 times the time duration of one frame.

[0113] 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%.

[0114] Similarly, in some embodiments of the present disclosure, the time duration between the moment when the display data received by the display panel switches from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit switches from the first frame to the second frame is less than or equal to 0.55 times the length of one frame time.

[0115] In some embodiments of the present disclosure, the time duration between the moment when the display data received by the display panel switches from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit switches from the first frame to the second frame is 0.35 to 0.55 times the length of one frame time.

[0116] The display data of the first frame corresponds to the duty cycle of the cathode or anode of the backlight unit in 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 in the second frame.

[0117] The above-mentioned embodiments of the present disclosure shorten the delay problem between backlight refresh and display screen refresh.

[0118] Fig. 4 is a schematic diagram showing the delay time of the backlight zones provided by an embodiment of the present disclosure.

[0119] As shown in Fig. 4, if the image switches from a black screen to a white screen at time T1, a synchronization signal Vsync is sent once in each frame, in the example where the backlight data of the plurality of backlight zones are obtained before being provided to the backlight driver, and the backlight driver performs an 8-fold frequency output, the signal output by the backlight zone (for example, the signal output by the anode of the LED) is curve a, in the curve a, the duty cycle of the PWM signal of the backlight zone is reduced at time T2, for example, the duty cycle of the PWM signal is reduced from 100% to 0%, therefore, the backlight response time delay is about 1.25 frames.

[0120] As shown in Fig. 4, if the image switches from a black screen to a white screen at time T1, in the embodiment of the present disclosure, the signal output by the backlight zone (for example, the signal output by the anode of the LED) is curve b, and in the curve b, the duty cycle of the PWM signal of the backlight zone is reduced at time T3, so the backlight response time delay can be controlled within the range of 0.35 frame to 0.55 frame. For example, a frame of picture is 16.7 ms, and in the embodiment of the present disclosure, the backlight response time delay may be in the range of 6 ms to 8 ms.

[0121] As shown in Fig. 1C, 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 backlight driving signals of the plurality of backlight zones. The micro control unit 131 is configured to: receive each of the groups of backlight data provided by the controller; determine a target backlight zone to which the backlight local control signal in each of the groups of backlight data belongs according to the header; obtain a global backlight drive signal; determine a target backlight driving signal for a target backlight zone based on a global backlight driving signal and a backlight local control signal; and update the target backlight driving signal to data address corresponding to the target backlight zone in the storage unit.

[0122] For example, the MCU 131 receives each of the groups of backlight data provided by the second control apparatus 12, and determines the target backlight zone to which the backlight local control signal in each of the groups of backlight data belongs according to the value of the header. For example, if the value of the header is 0x0FF8, the target backlight zone to which the backlight local control signal in the group of backlight data belongs is the first group of zones. The global backlight driving signal is, for example, a brightness modulation signal acquired from the TCON 11. The brightness modulation signal and the backlight local control signal perform "AND" operation to obtain the brightness control signal of each of the backlight zones.

[0123] For example, each of the backlight zones corresponds to a data address, and the target backlight driving signal of the target backlight zone is written into the data address position corresponding to the target backlight zone for storage.

[0124] In some embodiments of the present disclosure, the micro control unit is configured to receive each of the groups of backlight data via direct memory access. The direct memory access allows certain hardware subsystems to access memory independently of the processing unit. For example, the MCU's DMA uses storage registers to store backlight data after SPI data reception.

[0125] In some embodiments of the present disclosure, after DMA receives SPI data, it enters DMA interruption, firstly performs header determination to identify which row the data belongs to, and if it is the first row, writes the first row data address 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 of the duty cycle value 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, after receiving the data, the LED driver chip refreshes the backlight brightness, and the processing flow is shown in Fig. 5A.

[0126] In some embodiments of the present disclosure, the micro control unit is further configured to: in response to the global backlight driving signal changing to the updated value, determine whether a duration of the updated value is greater than or equal to a preset threshold; and in response to a duration of the updated value being greater than or equal to the preset threshold, re-determine the target backlight driving signal based on the updated value and the backlight local control signal.

[0127] Fig. 5A shows a flow chart of a method for calculating brightness control signals of each of the backlight zones provided by at least one embodiment of the present disclosure.

[0128] As shown in Fig. 5A, the method includes steps S501 to S506.

[0129] Step S501: after DMA completes receiving SPI data, entering DMA interruption.

[0130] Step S502: header recognition, identifying which row the backlight data belongs to.

[0131] Step S503: writing the target backlight driving signal into the corresponding data address of the array Duty1 of the backlight local control signal. For example, if it is the first row, the data address of the first row in the array Duty1 of the backlight local control signal is written.

[0132] Step S504: capturing the brightness modulation signal to calculate the duty cycle. For example, "AND" operation is performed on each element in the array Duty1 of the backlight local control signal and the brightness modulation signal to obtain the array Duty2 including the brightness control signals of each backlight zone.

[0133] Step S505: sending an array Duty2 including brightness control signals of each of the backlight zones to the LED integrated circuit driver chip 132. The backlight Duty2 value is output to the LED integrated circuit driver chip 132, and the LED integrated circuit driver chip 132 refreshes the backlight brightness after receiving the data.

[0134] Step S506: entering the next DMA cycle.

[0135] During the thread execution of the method of Fig. 5A, another thread for updating the brightness modulation signal is also synchronously executed. Fig. 5B shows a flow chart of a method for updating a brightness modulation signal provided by at least one embodiment of the present disclosure. For example, the thread of Fig. 5B is executed by the main program, and enters the subroutine shown in Fig. 5A after a DMA interrupt occurs.

[0136] As shown in Fig. 5B, the method includes steps S510 to S530.

[0137] Step S510: capturing a brightness modulation signal.

[0138] Step S520: determining whether the duty cycle value of the brightness modulation signal has changed, and whether the duration of the changed duty cycle value (that is, the updated value) exceeds two cycles of the brightness modulation signal.

[0139] Step S530: if the duration of the duty cycle value of the brightness modulation signal after the duty cycle value is changed exceeds two cycles of the brightness modulation signal, updating the brightness modulation signal to the duty cycle value.

[0140] If the duration of the changed PWM duty cycle value does not exceed two brightness modulation signal cycles, the process returns to step S510.

[0141] In the present embodiment, after the duty cycle of the brightness modulation signal is changed, it is further determined whether the duration of the changed duty cycle value exceeds two brightness modulation signal cycles, the brightness modulation signal is updated only when more than two brightness modulation signal cycles have passed, thereby solving the backlight flickering problem caused by the brightness modulation signal capture error.

[0142] In some embodiments of the present disclosure, as shown in Fig. 1C, the backlight driver further includes a backlight driver chip (for example, an LED integrated circuit driver chip 132), the backlight unit includes M groups of backlight zones, and the micro control unit is further configured to receive a synchronization signal provided by the controller and directly provide a synchronization signal to the backlight driver chip, the synchronization signal includes M effective pulse widths in each frame, and the effective pulse widths of the synchronization signal indicate backlight data transmission. The micro control unit is further configured to provide a plurality of groups of backlight driving signals stored in the storage unit to the plurality of backlight driving chips at a valid edge of the synchronization signal in response to the target backlight driving signal being updated to the data address.

[0143] In some embodiments of the present disclosure, each of the groups of backlight data as described above further includes: a chip selection signal transmitted by a chip selection 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 a rising edge of the chip selection signal, the backlight data in the receiving register is written into the storage register and the receiving register is cleared.

[0144] SPI initialization time moves from CS falling edge to CS rising edge, that is, after the TCON data is sent, the SPI data is received and stored in the storage register, and then the receiving register is initialized to prepare for the next data reception; even if it is interrupted by DMA interrupt, it will not affect the current data reception and the next data reception; TCON sent data incorrectly or missed data this time, and the DMA interrupt could not be completed, the erroneous data will be cleared when the MCU is initialized to ensure that the next data is received correctly.

[0145] Fig. 6A shows a signal timing diagram of a controller generating backlight data for all backlight zones and then sending the backlight data; Fig. 6B shows a timing diagram of signals generated and sent by a controller provided by at least one embodiment of the present disclosure. As shown in Fig. 6A, at time t1, the controller TCON sends out a synchronization signal Vsync, and each frame of the synchronization signal Vsync includes a rising edge. At a rising edge of the synchronization signal Vsync, the controller TCON sends out 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 driver chip in the backlight driver at a falling edge of the synchronization signal Vsync. The controller TCON provides the SPI signal at the rising edge of the synchronization signal Vsync.

[0146] If at time t1, the display signal (that is, OC signal) of the display panel is switched to the display signal of the N-th image frame (referred to as "N-th frame"). However, the controller TCON needs to analyze the display signal provided by the front end, such as the SOC, calculate the initial value of the backlight of each zone, and then perform spatial and temporal filtering to obtain the backlight local control signal, when the controller TCON completes the calculation and obtains the backlight local 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, within a period of time after time t1, the signal provided by the controller TCON to the MCU through the SPI is still the SPI signal of the (N-1)-th frame (ie, backlight data). 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 the SPI.

[0147] As shown in Fig. 6A, in this example, the MCU outputs the synchronization signal Vsync at an 8-fold frequency, and at a falling edge of the 8-fold frequency synchronization signal Vsync, the MCU provides an SPI signal to the LED integrated circuit driver chip.

[0148] As shown in Fig. 6A, at the second moment t2 after the controller TCON provides the SPI signal of the N-th 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, and the time duration between moment t2 and moment t1 is approximately 1.25 frames. For example, after the MCU 131 in Fig. 1C performs an "AND" operation on the backlight local control signal and the brightness modulation signal (global PMW signal) to obtain the brightness control signal of each of the backlight zones, the brightness control signal output by the LED integrated circuit driver chip 132 changes at time t2. That is, the brightness control signal has a delay of 1.25 frames.

[0149] As shown in Fig. 6A, the SPI signal 601 sent by the MCU is the brightness control signal of the N-th frame, the eight SPI signals before the SPI signal 601 are the same, and are all brightness control signals required by each light emitting diode in the (N-1)-th frame. SPI signal 601 and the following 7 SPI signals are the brightness control signals required by each light emitting diode in the N-th frame.

[0150] The LED integrated circuit driver chip outputs an LED driving signal for driving the LED according to the brightness control signal, and the LED integrated circuit driver chip provides an LED driving signal with a changed duty cycle to the LED at the rising edge of the MCU synchronization signal Vsync, thereby changing the brightness of the LED.

[0151] In some embodiments of the present disclosure, the controller provides backlight data to the backlight driver at the valid edge of each synchronization signal. As shown in Fig. 6B, the valid edge of the synchronization signal is, for example, a 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 shown in Fig. 6B, the display signal (that is, OC signal) of the display panel is switched to the display signal of the (N+1)-th frame at time t3. At time t3, the controller TCON sends out a synchronization signal Vsync, each frame of the synchronization signal Vsync sent out by the controller TCON includes M rising edges, if the display apparatus has 8 backlight zones, M is equal to 8. At the rising edge of the synchronization signal Vsync sent by the controller TCON, the controller TCON sends out an SPI signal, and the MCU in the backlight driver directly outputs the synchronization signal Vsync without the need for 8-fold frequency. After receiving the SPI signal from the controller TCON, the MCU in the backlight driver provides a brightness control signal to the backlight driver LED integrated circuit driver chip 132 at the falling edge of the synchronization signal Vsync.

[0152] If the image changes at time t3, the brightness control signal of the first group of backlight zones outputted at time t4 by the LED integrated circuit driver chip 132 in the backlight driver changes, and then the brightness control signal of the second backlight zone output subsequently changes accordingly. That is, the delay of the brightness control signal can be controlled within a range of 0.35 frame to 0.55 frame.

[0153] 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, the SPI signal includes the brightness control signal of the first group of backlight zones (that is, the brightness control signal of the first group of backlight zones is the brightness control signal of the (N+1)-th frame image) and the brightness control signal of the second group of backlight zones to the brightness control signal of the eighth group of backlight zones after the MCU updates the global backlight drive signal and the backlight local control signal, and the brightness control signals of the second group of backlight zones to the brightness control signals of the eighth group of backlight zones are still those of the N-th frame image.

[0154] After the MCU in the backlight driver provides the SPI signal 602 to the LED integrated circuit driver chip in the backlight driver, at the rising edge of the synchronization signal Vsync provided by the next MCU in the backlight driver, the duty cycle of the LED driving 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.

[0155] 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, the SPI signal includes a brightness control signal of the first group of backlight zones of the (N+1)-th frame, a brightness control signal of the second group of backlight zones of the (N+1)-th frame, and brightness control signals of the third group of backlight zones to the eighth group of backlight zones, and the brightness control signals of the third group of backlight zones to the brightness control signals of the eighth group of backlight zones are still those of the N-th frame image.

[0156] At the rising edge of the synchronization signal Vsync provided by the next MCU in the 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 driving signal output by the LED integrated circuit driver chip in the backlight driver has changed according to the updated brightness control signal of the second group of backlight zones. The other groups of backlight zones are similar to the first group of backlight zones and the second group of backlight zones, which are omitted herein.

[0157] The LED driving signal refers to the duty cycle signal of the LED cathode / anode. When the LED driving signal of the first backlight zone changes, the LED driving signal of the second backlight zone has not been updated, so there is a difference (for example, when the screen switches from black to white, the duty cycle of the first group becomes larger to display the white screen, at this moment the second group has not changed and is still the duty cycle corresponding to the black screen).

[0158] It should be noted that the square wave signal of the LED driving signal is only a schematic representation, and in actual application, the frequency of the square wave signal may be greater than the frequency shown in Fig. 6B.

[0159] In some embodiments of the present disclosure, the display apparatus further includes: a display panel, the display panel is coupled to a backlight unit, and the backlight unit is configured to provide a planar light source for display of the display panel. For example, as described above, the display panel may be a liquid crystal display panel, and the backlight unit is arranged on a non-display side of the liquid crystal panel to provide a planar light source for display of the liquid crystal panel.

[0160] Another aspect of the present disclosure provides a brightness adjustment method of a backlight unit, and the backlight unit includes a plurality of groups of backlight zones.

[0161] Fig. 7 shows a brightness adjustment method provided by at least one embodiment of the present disclosure. The brightness adjustment method can be applied to the display apparatus provided by any one of the embodiments of the present disclosure.

[0162] As shown in Fig. 7, the brightness adjustment method includes steps S701 and S702.

[0163] Step S701: generating a plurality of groups of backlight data in sequence according to a frame of image to be displayed, the plurality of groups of backlight data are different, and each of the groups of backlight data includes backlight local control signals of some backlight zones among the plurality of groups of backlight zones.

[0164] Step S702: providing a plurality of groups of backlight data to the backlight driver in sequence within one frame time, and the backlight driver controls the brightness of the plurality of groups of backlight zones according to the respective backlight local control signals of the plurality of groups of backlight data.

[0165] The brightness adjustment method can reduce the delay between backlight refresh and display screen refresh.

[0166] For step S701, the plurality of groups of backlight data and the backlight local control signal can refer to the above descriptions. Step S701 can be executed by the controller described above. Please refer to the above descriptions for step S702, which may be executed by the controller.

[0167] In some embodiments of the present disclosure, providing a plurality of groups of backlight data to the backlight driver in sequence within one frame time, includes: starting from generating a backlight local control signal of the (K+1)-th group of backlight zone in the M groups of backlight zones, sequentially providing the plurality of groups of backlight data to the backlight driver within one frame time, in which M is a positive integer greater than or equal to 2, and K is a positive integer greater than or equal to 0 and less than (M-1).

[0168] In some embodiments of the present disclosure, the starting from generating a backlight local control signal of the (K+1)-th group of backlight zone in the M groups of backlight zones, sequentially providing the plurality of groups of backlight data to the backlight driver within one frame time, includes: while acquiring the backlight local control signal of the (i+K)-th group of backlight zones, providing the backlight data of the i-th group of backlight zones to the backlight driver, where i is a positive integer less than M-K+1.

[0169] In some embodiments of the present disclosure, the plurality of groups of backlight data respectively include backlight local control signals of different groups of backlight zones among the plurality of groups of backlight zones.

[0170] In some embodiments of the present disclosure, each of the groups of backlight data includes a data signal, the data signal includes a header and the backlight local control signal, the header is used to indicate a target backlight zone group among a plurality of groups of backlight zones to which the backlight local control signal comprised in the data signal belongs, and headers of the plurality of groups of backlight data are different.

[0171] 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.

[0172] In some embodiments of the present disclosure, the time duration between the moment when the display data received by the display panel switches from the first frame to the second frame and the moment when the data transmitted by the peripheral interface switches from the first frame to the second frame is less than 1.23 times the length of one frame time; or the time duration between the moment when the display data received by the display panel switches from the first frame to the second frame and the moment when the duty cycle of the cathode or anode of the backlight unit switches from the first frame to the second frame is less than 1.23 times the time duration of one frame.

[0173] In some embodiments of the present disclosure, the time duration between the moment when the display data received by the display panel switches from the first frame to the second frame and the moment when the data transmitted by the peripheral interface switches from the first frame to the second frame is 0.35 to 0.55 times the length of one frame time; or the time duration from the moment when the display data received by the display panel switches from the first frame to the second frame to the moment when the duty cycle of the cathode or anode of the backlight unit switches from the first frame to the second frame is 0.35 to 0.55 times the length of one frame.

[0174] In some embodiments of the present disclosure, the backlight driver includes a micro control unit. The micro control unit executes: receiving each of the groups of backlight data provided by the controller; determining the target backlight zone to which the backlight local control signal in each group of backlight data belongs according to the header; obtaining the global backlight driving parameter; determining a target backlight driving parameter of the target backlight zone based on the global backlight driving parameter and the backlight local control signal; and writing the target backlight driving parameter of the target backlight zone into the data address corresponding to the target backlight zone in the backlight driver.

[0175] In some embodiments of the present disclosure, the backlight driver further includes a backlight driving chip, the backlight unit includes M groups of backlight zones, 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.

[0176] In some embodiments of the present disclosure, the micro control unit further performs: in response to the global backlight driving parameter being changed to an updated value, determining whether a 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 a preset threshold, re-determining the target backlight driving parameter based on the updated value and the backlight local control signal.

[0177] In some embodiments of the present disclosure, the micro control unit is configured to receive each of the groups of backlight data by direct memory access.

[0178] In some embodiments of the present disclosure, each of the groups of backlight data further includes: a chip selection signal transmitted by a chip selection signal line, the backlight data is written into a receiving register, and at the rising edge of the chip selection signal, the backlight data in the receiving register is written into a storage register and the receiving register is cleared.

[0179] It should be noted that in the embodiments of the present disclosure, each unit or device of the above-mentioned display apparatus corresponds to each step of the brightness adjustment method. For the relevant description of the brightness adjustment method, reference can be made to the relevant description of the display apparatus, which will not be repeated here. The components and structures of the above-mentioned display apparatus are merely exemplary and non-limiting. The above-mentioned display apparatus may further include other components and structures as required.

[0180] The technical effects of the storage medium provided by the embodiments of the present disclosure can be referred to the corresponding description of the image display processing method in the above embodiments, which will not be repeated herein.

[0181] The following points need to be explained: (1) The drawings of the embodiment of the present disclosure only relate to the structure related to the embodiment of the present disclosure, and other structures can refer to the general design. (2) In the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other to obtain a new embodiment.

[0182] The above is only the specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto, and the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. A display apparatus, comprising: a backlight unit, comprising a plurality of groups of backlight zones; a backlight driver, connected with the backlight unit, and configured to control brightness of the plurality of groups of backlight zones according to respective backlight local control signals of the plurality of groups of backlight zones; and a controller, connected with the backlight driver, and configured to: generate a plurality of groups of backlight data according to a frame of image to be displayed, wherein at least one group of backlight data among the plurality of groups of backlight data is different from other groups of backlight data, and each of the groups of backlight data comprises one or more of the backlight local control signals of a part of groups of backlight zones among the plurality of groups of backlight zones; and within one frame time, sequentially provide the plurality of groups of backlight data to the backlight driver.

2. The display apparatus according to claim 1, wherein the plurality of groups of backlight data are different from each other; the plurality of groups of backlight data respectively comprises the backlight local control signals of different groups of backlight zones among the plurality of groups of backlight zones.

3. The display apparatus according to claim 2, wherein each of the groups of backlight data comprises a data signal, the data signal comprises a header and the backlight local control signal, the header is used to indicate a target backlight zone group among the plurality of groups of backlight zones to which the backlight local control signal comprised in the data signal belongs, and headers of the plurality of groups of backlight data are different from each other.

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

5. The display apparatus according to any one of claims 1 to 4, wherein the controller is connected with the backlight driver by a peripheral interface, and the plurality of groups of backlight data are transmitted by the peripheral interface.

6. The display apparatus according to any one of claims 1 to 5, wherein the display apparatus further comprises a display panel, a time duration between a moment when display data received by the display panel switches from a first frame to a second frame and a moment when a duty cycle of a cathode or an anode of the backlight unit switches from the first frame to the second frame is less than 1.23 times a length of one frame time.

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

8. The display apparatus according to claim 7, wherein the time duration from the moment when the display data received by the display panel switches from the first frame to the second frame to the moment when the duty cycle of the cathode or the anode of the backlight unit switches from the first frame to the second frame is 0.35 to 0.55 times the length of one frame time.

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

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

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

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

13. The display apparatus according to any one of claims 9 to 12, wherein a starting point of the one frame time is a starting point when the display panel receives one frame of display data, and an ending point of the one frame time is a starting point when the display panel receives a next frame of display data.

14. The display apparatus according to any one of claims 9 to 13, wherein the backlight unit comprises M groups of backlight zones, and the controller is configured to: from the moment when the backlight data of the (K+1)-th group of backlight zones in the M groups of backlight zones is generated, the plurality of groups of backlight data are sequentially provided to the backlight driver within one frame time, 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 apparatus according to any one of claims 7 to 14, wherein the backlight data from the first group of backlight zones to the (M-K)-th group of backlight zones are regarded as respective groups of backlight data; and the backlight data of the backlight zones from the (M-K+1)-th group to the M-th group are combined into one group of backlight data.

16. The display apparatus according to claim 14 or 15, wherein the controller is configured to provide backlight data of the i-th group of backlight zones to the backlight driver at the same time as the backlight local control signal of the (i+K+1)-th group of backlight zones is generated, so that the backlight driver drives the i-th group of backlight zones, wherein i is a positive integer less than M-K+1,17. The display apparatus according to any one of claims 14 to 16, wherein K=2.

18. The display apparatus according to any one of claims 9 to 16, wherein the controller is further configured to provide a synchronization signal to the backlight driver, the synchronization signal is used to instruct the controller to start transmitting the backlight data, and the synchronization signal comprises M effective pulse widths in each frame.

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

20. The display apparatus according to any one of claims 3 to 19, wherein the backlight driver comprises: a micro control unit and a storage unit, the storage unit is configured to store backlight driving signals of the plurality of backlight zones, the micro control unit is configured to: receive each of the groups of backlight data provided by the controller; determine a target backlight zone to which the backlight local control signal in each of the groups of backlight data belongs according to the header; obtain a global backlight drive signal; determine a target backlight driving signal of the target backlight zone based on the global backlight driving signal and the backlight local control signal; and update the target backlight driving signal to data address corresponding to the target backlight zone in the storage unit.

21. The display apparatus according to claim 20, wherein the backlight driver further comprises a backlight driving chip, and the backlight unit comprises M groups of backlight zones, 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 comprises M effective pulse widths in each frame, and the effective pulse widths of the synchronization signal indicate the backlight data transmission, and 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 a valid edge of the synchronization signal in response to the target backlight driving signal being updated to the data address.

22. The display apparatus according to claim 20 or 21, wherein the micro control unit is further configured to: in response to the global backlight driving signal changing to an updated value, determine whether a duration of the updated value is greater than or equal to a preset threshold; and in response to a duration of the updated value being greater than or equal to the preset threshold, re-determine the target backlight driving signal based on the updated value and the backlight local control signal.

23. The display apparatus according to claim 22, wherein the micro control unit is configured to receive each of the groups of backlight data by direct memory access.

24. The display apparatus according to claim 23, wherein each of the groups of backlight data further comprises: a chip selection signal transmitted by a chip selection signal line, and the backlight driver further comprises a receiving register and a storage register, the backlight data is written into the receiving register, and at a rising edge of the chip selection signal, the backlight data in the receiving register is written into the storage register, and the receiving register is cleared.

25. The display apparatus according to any one of claims 22 to 24, wherein the global backlight driving signal is used to indicate the global duty cycle of the plurality of groups of backlight zones.

26. The display apparatus according to any one of claims 1 to 25, wherein the backlight local control signal is used to indicate local duty cycles of part of backlight zones in the plurality of groups of backlight zones.

27. The display apparatus according to any one of claims 1 to 26, wherein the backlight unit comprises light-emitting diodes arranged in an array, and one or more rows of light-emitting diodes serve as one of the plurality of groups of backlight zones.

28. The display apparatus 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 display of the display panel.

29. A brightness adjustment method of a backlight unit, wherein the backlight unit comprises a plurality groups of backlight zones, and the method comprises: sequentially generating a plurality of groups of backlight data according to a frame of image to be displayed, wherein the plurality of groups of backlight data are different, and each of the groups of backlight data comprises backlight local control signals of part of backlight zones in the plurality of groups of backlight zones; and providing the plurality of groups of backlight data to a backlight driver in sequence within one frame time, and controlling brightness of the plurality of groups of backlight zones according to respective backlight local control signals of the plurality of groups of backlight data by the backlight driver.

30. The adjustment method according to claim 29, wherein providing the plurality of groups of backlight data to the backlight driver in sequence within one frame time comprises: starting from generating a backlight local control signal of the (K+1)-th group of backlight zones in the M groups of backlight zones, sequentially providing the plurality of groups of backlight data to the backlight driver within one frame time, wherein M is a positive integer greater than or equal to 2, and K is a positive integer greater than and less than (M-1).

31. The adjustment method according to claim 30, wherein starting from generating the backlight local control signal of the (K+1)-th group of backlight zones in the M groups of backlight zones, sequentially providing the plurality of groups of backlight data to the backlight driver within one frame time comprises: providing the backlight data of the i-th group of backlight zones to the backlight driver at the same time as the backlight local control signal of the (i+K)-th group of backlight zones is acquired, wherein i is a positive integer less than M-K+1.

32. The adjustment method according to claim 31, wherein the plurality of groups of backlight data respectively comprises the backlight local control signals of different groups of backlight partition among the plurality of groups of backlight zones.

33. The adjustment method according to claim 32, wherein each of the groups of backlight data comprises a data signal, the data signal comprises a header and the backlight local control signal, the header is used to indicate a target backlight zone group among the plurality of groups of backlight zones to which the backlight local control signal comprised in the data signal belongs, and headers of the plurality of groups of backlight data are different.

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

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