LED backlight driving system and driving method

Abstract

The invention discloses an LED backlight driving system. The LED backlight driving system comprises a backlight time sequence controller, at least one first LED lamp panel and at least one second LED lamp panel. The first LED lamp panel and the second LED lamp panel are each provided with a plurality of driving links, the backlight time sequence controller sends a backlight brightness driving instruction to each driving link, and the backlight brightness driving instruction further comprises a first position relation instruction or a second position relation instruction; the first position relation instruction controls the driving chip to obtain a backlight brightness data packet according to a first position corresponding relation; the second position relation instruction controls the driving chip to obtain the backlight brightness data packet according to the second position corresponding relation. According to the invention, the problem that the driving sequences of the driving chips on the lamp panels are inconsistent due to the physical position relationship between the lamp panels and the backlight time schedule controller in the practical application of multiple lamp panels is solved. Therefore, backlight sequential control and the LED lamp panel can be configured on the LED backlight panel more flexibly, and the wiring area is greatly saved.

Description

Technical Field

[0001] The present invention relates to the field of image display technology, and in particular to an LED backlight driving system and a driving method. Background Art

[0002] At present, the LED driving technology used in Mini-LED backlight panels generally uses one LED driver chip to control and drive multiple channels of LED light strings, and multiple LED driver chips are connected in series using a single-line chain, such as Figure 1 As shown. Only a single signal line is used in the communication link, which minimizes the communication wiring and facilitates simplified wiring in integrated circuit design; it is used in some Mini-LED backlight modules, integrated circuits and other systems to achieve efficient and stable communication between the host and multiple slaves. The automatic address encoding method for the slave can quickly and accurately encode the address of the slave in the chain communication link; the use of a specific encoding method (Manchester encoding or pulse width encoding) ensures the anti-interference and stability of data transmission.

[0003] In the prior art, LED driver chips and LED light-emitting elements are usually integrated into LED light boards, and connected to the backlight timing controller Bcon outside the LED light board to form an LED backlight driving system. In practical applications, in order to save wiring, the backlight timing controller Bcon is usually located in the middle of different LED light boards, such as Figure 2 As shown. For light board A, since the serial direction of the LED driver chip is from top to bottom, it can be ensured that the LED driver chip on each drive channel obtains the backlight brightness data from top to bottom in sequence and drives the LED light-emitting element to display the backlight brightness. However, looking at light board B, since its LED driver chip is in the serial direction from bottom to top, the LED driver chip at the bottom on each drive channel obtains the backlight brightness data first and drives the LED light-emitting element to display the backlight brightness. This will cause the backlight brightness display to be inconsistent with the pixel scanning method of the liquid crystal image display panel above the backlight panel, resulting in poor display effect.

[0004] It can be seen that a new LED backlight driving system and driving method are needed for the multi-lamp board LED backlight panel in the prior art to ensure that the driving chips on the lamp boards can be driven in the same direction between different lamp boards. Summary of the invention

[0005] The technical purpose to be achieved by the present invention is to provide an LED backlight driving system and driving method. The LED backlight driving system and driving method based on the present invention can solve the problem that the light boards in a multi-light board LED backlight panel cannot be driven in the same physical direction due to the positional relationship between the backlight timing controller and the LED light board.

[0006] Based on the above technical objectives, the present invention provides an LED backlight driving system, the LED backlight driving system comprising a backlight timing controller and at least one first LED light board and at least one second LED light board;

[0007] The first LED light board and the second LED light board are both provided with a plurality of LED driving links, each of the LED driving links being a serial communication link composed of at least a plurality of LED driving chips connected in series;

[0008] The backlight timing controller sends a backlight brightness driving instruction to each LED driving link, wherein the data frame of the backlight brightness driving instruction at least includes a frame header bit and a backlight brightness data bit;

[0009] The frame header bit is used for the LED driver chip to identify its physical order in the LED driver link, and the backlight brightness data bit contains a plurality of backlight brightness data packets arranged in sequence;

[0010] The backlight brightness driving instruction further includes a first position relationship instruction or a second position relationship instruction, and the backlight brightness driving instruction sent by the backlight timing controller to the LED driving link of the first LED light board also includes the first position relationship instruction; the backlight brightness driving instruction sent by the backlight timing controller to the LED driving link of the second LED light board also includes the second position relationship instruction;

[0011] The first position relationship instruction controls the LED driver chip to obtain the backlight brightness data packet in the backlight brightness data bit according to the first position corresponding relationship;

[0012] The second position relationship instruction controls the LED driver chip to obtain the backlight brightness data packet in the backlight brightness data bit according to the second position corresponding relationship.

[0013] In one embodiment, the first position relationship instruction controls the LED driver chip to sequentially acquire the backlight brightness data packets in the backlight brightness data bits in a positive sequence.

[0014] In one embodiment, the second position relationship instruction controls the LED driver chip to sequentially obtain the backlight brightness data packets in the backlight brightness data bits in reverse order.

[0015] In one embodiment, the data frame of the backlight brightness driving instruction includes a control command bit, and the first position relationship instruction or the second position relationship instruction is included in the control command bit.

[0016] In one embodiment, each of the LED driver chips is provided with a first data transmission port D1 and a second data transmission port D2; the first data transmission port D1 of each LED driver chip is connected to the second data transmission port D2 of the LED driver chip of the previous level adjacent to the LED driver chip, and the second data transmission port D2 of each LED driver chip is connected to the first data transmission port D1 of the LED driver chip of the next level adjacent to the LED driver chip, and the first LED driver chip in the LED driver chain is connected to the transmission port of the backlight timing controller.

[0017] In one embodiment, when the LED backlight driving system adopts a unidirectional communication mode, the second data transmission port of the last LED driving chip in the LED driving link is connected to the input port of the backlight timing control.

[0018] In one embodiment, when the LED backlight driving system adopts a bidirectional communication mode, the second data transmission port of the last LED driving chip in the LED driving link is vacant.

[0019] In one embodiment, after receiving each data bit, the LED driver chip transmits a data bit to the next-level LED driver chip through a read and write operation.

[0020] Compared with the prior art, one or more embodiments of the present invention may have the following advantages:

[0021] The present invention uses the control of the order in which the LED driver chip obtains the data packets in the backlight brightness data bit to realize the control of the order in which the LED driver chip drives the LED elements on the LED driver link, thereby solving the problem of inconsistent driving order of the driver chips on the light board due to the physical position relationship between the light board and the backlight timing controller in the actual application of multiple light boards. Therefore, the backlight timing control and the LED light board can be configured more flexibly on the LED backlight panel to greatly save the wiring area.

[0022] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a schematic diagram of the single-line serial communication link structure of the LED driver chip given in the prior art;

[0025] Figure 2 It is a schematic diagram of the connection relationship between the LED light board and Bcon in the LED backlight driving system given in the prior art;

[0026] Figure 3 It is a schematic diagram of the structure of the instruction data frame sent by the backlight timing controller Bcon of the present invention;

[0027] Figure 4 It is a schematic diagram of the data frame transmission timing of the present invention. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings.

[0029] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part. And when the second element, component, region, layer or part is discussed, it does not indicate that the present invention necessarily has the first element, component, region, layer or part.

[0030] Spatially relative terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used here for convenience of description to describe the relationship between an element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, the spatial relationship terms are intended to also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, then the elements or features described as "under other elements" or "under it" or "under it" will be oriented as "on" other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0031] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0032] Example 1

[0033] The LED backlight driving system of this embodiment includes a backlight timing controller Bcon and at least one first LED light board and at least one second LED light board.

[0034] The first LED light board and the second LED light board are both provided with a plurality of LED driving links, each of which includes a plurality of LED driving chips, each of which is provided with a first data transmission port D1 and a second data transmission port D2. The plurality of LED driving chips are connected in series to form a serial communication link.

[0035] The serial communication link means that the first data transmission port D1 of each LED driver chip is connected to the second data transmission port D2 of the LED driver chip of the previous level adjacent to the LED driver chip, the second data transmission port D2 of each LED driver chip is connected to the first data transmission port D1 of the LED driver chip of the next level adjacent to the LED driver chip, and the first LED driver chip in the LED driver link is connected to the transmission port of the backlight timing controller Bcon.

[0036] Each of the LED driving chips has a plurality of LED driving channel pins, and the LED driving channel pins are used to connect LED light-emitting elements to control the LED light-emitting elements to emit light.

[0037] like Figure 3 As shown, the instruction data frame structure sent by the backlight timing controller Bcon of this embodiment includes at least a frame header bit (Start_Bits), a control command bit (Command) and a backlight brightness data bit (DATA). According to control needs, it may also include a register address bit (Reg_Addr), an echo data bit (Echo), and a data packet length bit (Data_Len).

[0038] The data frame header bit (Start_Bits) is used to identify the physical sequence position of the driver chip that currently receives the data frame on the serial communication link. The data format of the initial data frame header bit (Start_Bits) sent by the backlight timing controller Bcon is in the form of "Bit S+Bit 1". When the first LED driver chip in the LED driver link receives the data frame header bit, it will automatically add a data bit to the header bit, and the header bit will become "Bit S+Bit 0+Bit 1". The "Bit 0" represents that the physical sequence position of the first LED driver chip on the serial communication link is the first. Correspondingly, when the first LED driver chip recognizes its own sequence position through the header bit, it collects the brightness data packet of the corresponding position in the subsequent backlight brightness data bit as the backlight brightness data that needs to be driven and displayed by itself.

[0039] Similarly, the frame header bit received by the first input end of the second LED driver chip is "Bit S+Bit 0+Bit1", and the second LED driver chip adds a data bit to it, changing the frame header bit to "Bit S+Bit 0+Bit 0+Bit1". The two "Bit 0"s represent that the second LED driver chip is the second in the physical sequence position on the serial communication link. Correspondingly, when the second LED driver chip identifies its own sequence position through the frame header bit, it collects the corresponding brightness data packet in the subsequent backlight brightness data bit as the backlight brightness data that it needs to drive and display. And so on until all n driver chips correspondingly obtain the brightness data packet in the backlight brightness data bit as the backlight brightness data that it needs to drive and display.

[0040] It should be emphasized here that the present invention adopts a serial communication method, so each LED driver chip does not wait for the data frame to be completely received before passing the complete data frame to the next-level LED driver chip, but transmits a data bit to the next-level LED driver chip after each data bit is received through a read and write operation. Figure 4 As shown in the figure, for example, when the first LED driver chip receives Bit S of the frame header, it will immediately pass Bit S to the second LED driver chip. Similarly, the second LED driver chip will also immediately pass Bit S to the next-level driver chip. Therefore, the LED driver chips on the serial communication link receive Bit S almost at the same time.

[0041] Furthermore, when the first LED driver chip receives Bit 1 of the frame header, it determines that the frame header has been received, so it does not forward Bit 1 immediately, but sends Bit 0 to the next level and sends Bit 1 in the next data transmission cycle.

[0042] Similarly, except for the frame header bit data which adopts the above data transmission method, the rest such as the control command bit (Command), backlight brightness data bit (DATA), register address bit (Reg_Addr), echo data bit (Echo), and data packet length bit (Data_Len) all adopt this data transmission method.

[0043] The core of the present invention is to adjust the LED driver chip to control the corresponding relationship of obtaining the data packet at the corresponding position in the backlight brightness data bit after knowing its own physical sequence position in the LED driver link.

[0044] For example: the LED driving link is provided with m LED driving chips, and two position relationship instructions are provided in the control command bit of the data frame. The first position relationship instruction is to sequentially read the data packets in the backlight brightness data bits, that is, after the first LED driving chip reads the frame header bit and the control command bit, it knows that it is the first LED driving chip, and the control command bit is set to the first position relationship instruction. Then, when the first data packet in the backlight brightness data bits is transmitted to the first LED driving chip, the first LED driving chip reads the first data packet as the brightness data for driving the LED element.

[0045] The second position relationship instruction is to read the data packets in the backlight brightness data bits in reverse order, that is, after reading the frame header bit and the control command bit, the first LED driver chip knows that it is the first LED driver chip, and the control command bit is set to the second position relationship instruction. Then, when the last data packet in the backlight brightness data bits is transmitted to the first LED driver chip, the first LED driver chip reads the last data packet as the brightness data for driving the LED element. Similarly, under the second position relationship instruction, the last driver unit on the driver link reads the first data packet in the backlight brightness data bits as the brightness data for driving the LED element when the first data packet is transmitted to it.

[0046] Based on the above-mentioned first position relationship instruction and second position relationship instruction, the present embodiment further defines that the data sent by the backlight timing controller Bcon to the first LED light board includes the first position relationship instruction, and the data sent by the backlight timing controller Bcon to the second LED light board includes the second position relationship instruction. This solves the problem that the lower driver chip of the B light board obtains the backlight data to emit light due to the position relationship between the B light board and the controller Bcon, that is, the LED driver link controlling the B light board can read the data packet from the last driver chip and drive the LED element first.

[0047] Furthermore, in this embodiment, based on the above-mentioned first position relationship instruction and the second position relationship instruction, a data packet start reading position instruction can be added, and the data packet start reading position instruction controls the position of the LED driver chip that starts to read the data packet on the LED driver link. For example, when the first position relationship instruction is valid and the data packet start reading position instruction is 2, the first LED driver chip does not respond to the data packet in the backlight brightness data bit, and the second LED driver chip starts to read the first data packet in the backlight brightness data bit, and the third LED driver chip starts to read the second data packet in the backlight brightness data bit, and so on. Similarly, when the second position relationship instruction is valid and the data packet start reading position instruction is m-3 (m means that there are m driver chips in total on the aforementioned LED driver link), the m-3rd LED driver chip starts to read the first data packet in the backlight brightness data bit, and the m-4th LED driver chip starts to read the second data packet in the backlight brightness data bit, and so on.

[0048] The present invention may be a system, method and / or computer program product at any possible level of integrated technical detail. The computer program product may include a computer-readable storage medium (or multiple media) having computer-readable program instructions thereon for causing a processor to perform various aspects of the present invention.

[0049] A computer readable storage medium may be a tangible device that can retain and store instructions used by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. A non-exhaustive list of more specific examples of computer readable storage media includes the following: a portable computer floppy disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device such as a punch card or a raised structure in a groove on which instructions are recorded, and any suitable combination of the above. A computer readable storage medium, as used herein, should not be interpreted as a transient signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted by a wire.

[0050] The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a corresponding computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network may include copper transmission cables, optical transmission fibers, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in a computer-readable storage medium within the corresponding computing / processing device.

[0051] The computer-readable program instructions for performing the operation of the present invention may be assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, configuration data for integrated circuits, or source code or object code written in any combination of one or more programming languages ​​and process programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer, partially on a remote computer, or entirely on a remote computer or server. In the latter case, the remote computer may be connected to the user's computer by any type of network including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., by using the Internet of an Internet service provider). In certain embodiments, the electronic circuit including, for example, a programmable logic circuit, a field programmable gate array (FPGA) or a programmable logic array (PLA) may execute the computer-readable program instructions by utilizing the state information of the computer-readable program instructions to personalize the electronic circuit, thereby performing aspects of the present invention.

[0052] Various aspects of the present invention are described herein with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present invention. It is understood that each block of the flowchart illustration and / or block diagram, and the combination of blocks in the flowchart illustration and / or block diagram, can be implemented by computer-readable program instructions.

[0053] These computer-readable program instructions may be provided to a processor of a computer or other programmable data processing device to produce a machine so that the instructions executed by the processor of the computer or other programmable data processing device create instructions for implementing the flowcharts and / or block diagrams. Figure 1 These computer-readable program instructions may also be stored in a computer-readable storage medium capable of booting a computer, a programmable data processing device and / or other device that operates in a specific manner, so that the computer-readable storage medium having the instructions stored therein includes a manufactured product that includes instructions that implement aspects of the functions / actions specified in the flowchart and / or block diagram blocks.

[0054] Computer readable program instructions may also be loaded into a computer, other programmable data processing device, or other device to cause a series of operating steps to be performed on the computer, other programmable devices or other devices for producing a computer-implemented process, so that the instructions executed on the computer, other programmable device or other device implement the functions / actions specified in the flowchart and / or block diagram blocks.

[0055] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the system, method and computer program product according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagram may represent a module, segment or portion of an instruction, which includes one or more executable instructions for implementing a specified logical function. In some optional implementations, the functions indicated in the block may occur outside the order indicated in the figure. For example, in fact, two blocks shown in succession can be completed as a step, and depending on the functions involved, they can be executed concurrently, substantially concurrently, in a partially or fully time-overlapping manner, or sometimes these blocks can be executed in reverse order. It will also be noted that each block of the block diagram and / or flowchart illustration, as well as the combination of blocks in the block diagram and / or flowchart illustration, can be implemented by a dedicated hardware-based system that performs a specified function or action or performs a combination of dedicated hardware and computer instructions.

[0056] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, apparatuses (devices) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0057] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0058] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

Claims

1. An LED backlight driving system, the LED driving system comprising: A backlight timing controller and at least one first LED light board and at least one second LED light board; The first LED light board and the second LED light board are both provided with a plurality of LED driving links, each of the LED driving links being a serial communication link composed of at least a plurality of LED driving chips connected in series; The backlight timing controller sends a backlight brightness driving instruction to each LED driving link, wherein the data frame of the backlight brightness driving instruction at least includes a frame header bit and a backlight brightness data bit; The frame header bit is used for the LED driver chip to identify its physical order in the LED driver link, and the backlight brightness data bit contains a plurality of backlight brightness data packets arranged in sequence; The backlight brightness driving instruction further includes a first position relationship instruction or a second position relationship instruction, and the backlight brightness driving instruction sent by the backlight timing controller to the LED driving link of the first LED light board also includes the first position relationship instruction; the backlight brightness driving instruction sent by the backlight timing controller to the LED driving link of the second LED light board also includes the second position relationship instruction; The first position relationship instruction controls the LED driver chip to obtain the backlight brightness data packet in the backlight brightness data bit according to the first position corresponding relationship; The second position relationship instruction controls the LED driver chip to obtain the backlight brightness data packet in the backlight brightness data bit according to the second position corresponding relationship.

2. The LED backlight driving system according to claim 1, characterized in that: The first position relationship instruction controls the LED driver chip to sequentially acquire the backlight brightness data packets in the backlight brightness data bits in a positive sequence.

3. The LED backlight driving system according to claim 2, characterized in that: The second position relationship instruction controls the LED driver chip to sequentially obtain the backlight brightness data packets in the backlight brightness data bits in reverse order.

4. The LED backlight driving system according to claim 1, characterized in that: The data frame of the backlight brightness driving instruction includes a control command bit, and the first position relationship instruction or the second position relationship instruction is included in the control command bit.

5. The LED backlight driving system according to claim 1, characterized in that: Each of the LED driver chips is provided with a first data transmission port D1 and a second data transmission port D2; the first data transmission port D1 of each LED driver chip is connected to the second data transmission port D2 of the LED driver chip of the previous level adjacent to the LED driver chip, and the second data transmission port D2 of each LED driver chip is connected to the first data transmission port D1 of the LED driver chip of the next level adjacent to the LED driver chip, and the first LED driver chip in the LED driver chain is connected to the transmission port of the backlight timing controller.

6. The LED backlight driving system according to claim 5, characterized in that: When the LED backlight driving system adopts a unidirectional communication mode, the second data transmission port of the last LED driving chip in the LED driving link is connected to the input port of the backlight timing control.

7. The LED backlight driving system according to claim 5, characterized in that: When the LED backlight driving system adopts a bidirectional communication mode, the second data transmission port of the last LED driving chip in the LED driving link is vacant.

8. The LED backlight driving system according to claim 1, characterized in that: After receiving each data bit, the LED driver chip transmits a data bit to the next-level LED driver chip through a read-write operation.

9. An LED backlight panel, comprising a plurality of LED driving units and a plurality of LED light groups, wherein the LED driving unit is formed by the LED backlight driving system according to any one of claims 1 to 8.

10. An LED display device, comprising the backlight panel according to claim 9.

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