Address setting method and LED driver system, and backlight apparatus

Abstract

The present disclosure discloses an address setting method applicable to a grouped serial LED driver system. The grouped serial LED driver system comprises a serial communication link formed by a plurality of LED driver chips arranged in a cascaded configuration. A signal input terminal of a first LED driver chip is connected to a signal output terminal of the LED driver control unit by means of an address resistor. When the LED driver chips are powered on, a configuration current from a signal input terminal of the first LED driver chip to the LED driver control unit is formed, so that different voltages are formed at the signal input terminal of the first LED driver chip. The first LED driver chip identifies its own grouping address by means of different voltage values. In the present invention, existing terminals are used to achieve the chip having different address coding according to the position where the chip is located in packet communication, thereby improving the communication efficiency, reducing the complexity of system wiring, and reducing the system cost.

Description

An address setting method, an LED driving system, and a backlight device Technical Field

[0001] This invention relates to the field of image display technology, and in particular to an address setting method, an LED driving system, and a backlight device. Background Technology

[0002] In existing large-scale LED display systems, the communication system, consisting of an LED driver control unit and multiple LED driver chips, often employs a single-wire serial transmission line for communication. This single-wire serial transmission method is based on a single-wire communication protocol and uses data encoding to propagate RGB three-color signals and other signals on a single data transmission channel. As shown in Figure 1, the LED driver control unit (i.e., the MCU shown in the figure) and multiple LED driver chips (i.e., IC11 to IC4n chips shown in Figure 1) are connected in series via a single wire. Each LED driver chip is connected to at least one LED light-emitting element, which is driven by the LED driver chip to emit light. The LED driver control unit has a transmitting end, and each LED driver chip includes a transmitting end and a receiving end. The transmitting end of the LED driver control unit is connected to the receiving end of the first LED driver chip, the transmitting end of the first LED driver chip is connected to the receiving end of the second LED driver chip, and so on, until the next LED driver chip is connected. This constitutes the LED driving system. The communication principle of this system is as follows: the LED driver control unit encodes the signals to be transmitted to each LED driver chip using a set of serial frame data. The LED driver chip receiving these signals receives and decodes the received data from the input frame data according to the communication mode and instruction type. Then, it constructs new frame data from the decoded data as output, re-encodes it according to the communication mode and instruction type, and sends it to the subsequent LED driver chip with valid address, completing one communication task. This communication system reduces the number of lines required for data transmission, achieving the goals of simplifying lines, reducing ports, and lowering costs.

[0003] However, with the increase in the number of pixels in the LED display system and the corresponding increase in the number of LED driver chips, the current single-line serial propagation method requires more LED driver chips to be connected in series. This is because in single-line communication, each chip needs to decode the data sent by the previous chip and then re-encode it before sending it to the next chip, which takes time. More LED driver chips mean that it takes more time to complete a communication, which leads to a significant decrease in communication efficiency and reduces the refresh rate of pixels.

[0004] Therefore, it is evident that the existing technology requires a new LED driving system, namely an address setting system for LED driver chips, in order to improve communication efficiency and pixel refresh rate when the number of LED driver chips increases significantly. Summary of the Invention

[0005] The technical objective of this invention is to provide an address setting method, an LED driving system, and a backlight device. Addressing the shortcomings of existing single-wire serial propagation methods, such as low communication efficiency and low pixel refresh rate with a larger number of pixels, this invention optimizes the single-wire serial propagation method by setting an address, transforming it into a method where one LED driver control unit communicates with several groups of LED driver chips separately. This significantly improves communication efficiency and pixel refresh rate.

[0006] Based on the above technical objectives, the present invention provides an address setting method suitable for a grouped serial LED driving system, wherein the grouped serial LED driving system includes:

[0007] An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor.

[0008] The address setting method includes:

[0009] After the LED driving system is powered on, the LED driving control unit is instructed to pull its own signal output port down to a low level.

[0010] Ensure that the signal input ports of all first-order LED driver chips output the same configuration current I to the signal output port of the LED driver control unit. CFG ;

[0011] The first LED driver chip has a pre-stored mapping relationship between different voltage values ​​and different group addresses. The first LED driver chip determines its own group address based on the detected voltage value of the signal input port and the mapping relationship.

[0012] When the LED driver control unit sends data to different LED driver groups, the data contains the address information of the LED driver group specified by the data. All first-order LED driver chips compare the address information contained in the data with their own group address to determine whether to respond to the data.

[0013] In one embodiment, the LED driver control unit is further provided with a control port and a switch control tube. The gate of the switch control tube is connected to the control port, its drain is connected to the signal output port of the LED driver control unit, and its source is grounded.

[0014] This invention also provides another address setting method suitable for a grouped serial LED driving system, the grouped serial LED driving system comprising:

[0015] An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor.

[0016] Meanwhile, the signal output port of the LED driver control unit is also connected to a grounding resistor; one end of the grounding resistor is connected to the signal output port of the LED driver control unit and the other end is grounded.

[0017] The address setting method includes:

[0018] After the LED driving system is powered on, the LED driving control unit is set to a high-impedance state at the control port.

[0019] Ensure that the signal input ports of all first-order LED driver chips output the same configuration current I to the signal output port of the LED driver control unit. CFG ;

[0020] The first LED driver chip has a pre-stored mapping relationship between different voltage values ​​and different group addresses. The first LED driver chip determines its own group address based on the detected voltage value of the signal input port and the mapping relationship.

[0021] When the LED driver control unit sends data to different LED driver groups, the data contains the address information of the LED driver group specified by the data. All first-order LED driver chips compare the address information contained in the data with their own group address to determine whether to respond to the data.

[0022] This invention also provides another address setting method suitable for a grouped serial LED driving system, the grouped serial LED driving system comprising:

[0023] An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor.

[0024] The signal output port of the LED driver control unit is also connected to a grounding capacitor; one end of the grounding capacitor is connected to the signal output port of the LED driver control unit and the other end is grounded.

[0025] The address setting method includes:

[0026] After the LED driving system is powered on, the LED driving control unit is set to a high-impedance state at the control port.

[0027] Ensure that the signal input ports of all first-order LED driver chips output the same configuration current I to the signal output port of the LED driver control unit. CFG ;

[0028] The first LED driver chip has a pre-stored mapping relationship between different voltage values ​​and different group addresses. The first LED driver chip determines its own group address based on the detected voltage value of the signal input port and the mapping relationship.

[0029] When the LED driver control unit sends data to different LED driver groups, the data contains the address information of the LED driver group specified by the data. All first-order LED driver chips compare the address information contained in the data with their own group address to determine whether to respond to the data.

[0030] This invention provides a grouped serial LED driving system, the grouped serial LED driving system comprising:

[0031] An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor.

[0032] The first LED driver chip is equipped with a group address encoding detection circuit, which includes a constant current source I. CFG Input port voltage detection circuit and address encoding circuit;

[0033] The constant current source I CFG Used to configure current I when the signal output port of the LED driver control unit is pulled low. CFG The signal output port that supplies signals to the LED driver control unit;

[0034] The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip;

[0035] The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value.

[0036] The present invention also provides a grouped serial LED driving system, the grouped serial LED driving system comprising:

[0037] An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor.

[0038] The LED driver control unit is also provided with a control port and a switch control tube. The gate of the switch control tube is connected to the control port, its drain is connected to the signal output port of the LED driver control unit, and its source is grounded.

[0039] The first LED driver chip is equipped with a group address encoding detection circuit, which includes a constant current source I. CFG Input port voltage detection circuit and address encoding circuit;

[0040] The constant current source I CFG Used to configure current I when the signal output port of the LED driver control unit is pulled low. CFG The signal output port that supplies signals to the LED driver control unit;

[0041] The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip;

[0042] The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value.

[0043] The present invention also provides a grouped serial LED driving system, the grouped serial LED driving system comprising:

[0044] An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor.

[0045] The signal output port of the LED driver control unit is also connected to a grounding resistor; one end of the grounding resistor is connected to the signal output port of the LED driver control unit and the other end is grounded.

[0046] The first LED driver chip is equipped with a group address encoding detection circuit, which includes a constant current source I. CFG Input port voltage detection circuit and address encoding circuit;

[0047] The constant current source I CFG Used to configure the current I when the signal output port of the LED driver control unit is in a high-impedance state. CFG The signal output port that supplies signals to the LED driver control unit;

[0048] The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip;

[0049] The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value.

[0050] The present invention also provides a grouped serial LED driving system, the grouped serial LED driving system comprising:

[0051] An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor.

[0052] The signal output port of the LED driver control unit is also connected to a grounding capacitor; one end of the grounding capacitor is connected to the signal output port of the LED driver control unit and the other end is grounded.

[0053] The first LED driver chip is equipped with a group address encoding detection circuit, which includes a constant current source I. CFG Input port voltage detection circuit and address encoding circuit;

[0054] The constant current source I CFG Used to configure the current I when the signal output port of the LED driver control unit is in a high-impedance state. CFG The signal output port that supplies signals to the LED driver control unit;

[0055] The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip;

[0056] The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value.

[0057] Compared with the prior art, one or more embodiments of the present invention may have the following advantages:

[0058] This invention addresses the shortcomings of current ultra-large LED display systems, such as reduced communication efficiency and pixel refresh rate as the number of pixels increases. It proposes the concept of packet communication, which utilizes existing ports to solve the problem of implementing different address encodings for chips based on their location in packet communication. This improves communication efficiency, reduces system wiring complexity, and lowers system costs.

[0059] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0060] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0061] Figure 1 is a schematic diagram of the structure of a single-wire series LED driving system in the prior art;

[0062] Figure 2 is a schematic diagram of the grouped single-wire series LED driving system of the first embodiment;

[0063] Figure 3 is a schematic diagram of the group address encoding detection circuit in the LED driver chip of the present invention;

[0064] Figure 4 is a schematic diagram of the grouped serial LED driving system of the second embodiment;

[0065] Figure 5 is a schematic diagram of the grouped serial LED driving system of the third embodiment;

[0066] Figure 6 is a schematic diagram of the grouped serial LED driving system of the fourth embodiment; Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0068] 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 may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this invention, the first element, component, area, layer, or portion discussed below may be referred to as a second element, component, area, layer, or portion. And when a second element, component, area, layer, or portion is discussed, it does not imply that the first element, component, area, layer, or portion necessarily exists in this invention.

[0069] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one 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, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0070] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0071] Example 1

[0072] As shown in Figure 2, the grouped single-wire series LED driving system of this embodiment includes: an LED driving control unit and multiple LED driving groups. Each LED driving group includes multiple LED driving chips, which are cascaded to form a serial communication link. Each LED driving chip has a signal input port (DI) and a signal output port (DO). The serial communication link formed by the cascaded LED driving chips means that the signal output port of the preceding chip is connected to the signal input port of the following chip. A first-level LED driving chip is included in the serial communication link. The signal input terminal of the first-level LED driving chip is connected to the signal output port of the LED driving control unit through an address resistor. The resistance values ​​of the address resistors connected to the multiple first-level LED driving chips in the multiple LED driving groups are different.

[0073] In this embodiment, the method for setting group addresses for multiple LED driver groups based on the above-mentioned LED driving system includes:

[0074] After the LED driver system is powered on, the LED driver control unit pulls its signal output port low. When the signal output port of the LED driver control unit is pulled low and the voltage value is close to zero, all the first LED driver chips simultaneously output the same configuration current I to the signal output port of the LED driver control unit. CFG Therefore, the input port voltages of the first LED driver chip in different LED driver groups are respectively I... CFG *R1, I CFG *R2,I CFG *R3, ..., I CFG *R n .

[0075] The first LED driver chip has a pre-stored mapping relationship between different voltage values ​​and different group addresses. The first LED driver chip determines its own group address based on the detected voltage value of the signal input port and the mapping relationship.

[0076] When the LED driver control unit sends data to different LED driver groups, the data contains the address information of the LED driver group specified by the data. All first-order LED driver chips compare the address information contained in the data with their own group address to determine whether to respond to the data.

[0077] In this embodiment, to ensure that each LED driver group can transmit the same configuration current I to the LED driver control unit... CFGAnd it can realize voltage detection of the signal input port. As shown in Figure 3, in this embodiment, a group address encoding detection circuit is set in at least all first and second LED driver chips. The group address encoding detection circuit includes a constant current source I. CFG The input port voltage detection circuit and address encoding circuit. The constant current source I... CFG This is used to configure current I when the signal output port of the LED driver control unit is pulled low and the voltage value is close to zero. CFG The signal output port of the LED driver control unit is supplied with a signal. The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip. The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value.

[0078] Example 2

[0079] As shown in Figure 4, the grouped single-wire series LED driving system of this embodiment includes: an LED driving control unit and multiple LED driving groups. Each LED driving group includes multiple LED driving chips, which are cascaded to form a serial communication link. Each LED driving chip has a signal input port and a signal output port. The serial communication link formed by the cascaded LED driving chips means that the signal output port of the preceding chip is connected to the signal input port of the following chip. A first-level LED driving chip is included in the serial communication link. The signal input terminal of the first-level LED driving chip is connected to the signal output port of the LED driving control unit through an address resistor. The resistance values ​​of the address resistors connected to the multiple first-level LED driving chips in the multiple LED driving groups are different.

[0080] Unlike the aforementioned embodiments, the LED driver control unit of the present invention is further provided with a control port G1 and a switch control tube N1. The gate of the switch control tube N1 is connected to the control port G1, the drain is connected to the signal output port of the LED driver control unit, and the source is grounded.

[0081] In this embodiment, the method for setting group addresses for multiple LED driver groups based on the above-mentioned LED driving system includes:

[0082] After the LED driver system is powered on, the LED driver control unit outputs a high-level state from its control port, thereby turning on the control switch and pulling the voltage of the signal output port of the LED driver control unit to zero. Simultaneously, all the first LED driver chips output the same configuration current I to the signal output port of the LED driver control unit. CFGTherefore, the input port voltages of the first LED driver chip in different LED driver groups are respectively I... CFG *R1, I CFG *R2,I CFG *R3, ..., I CFG *R n .

[0083] The first LED driver chip has a pre-stored mapping relationship between different voltage values ​​and different group addresses. The first LED driver chip determines its own group address based on the detected voltage value of the signal input port and the mapping relationship.

[0084] When the LED driver control unit sends data to different LED driver groups, the data contains the address information of the LED driver group specified by the data. All first-order LED driver chips compare the address information contained in the data with their own group address to determine whether to respond to the data.

[0085] Similar to Embodiment 1 above, in this embodiment, to ensure that each LED driver group can transmit the same configuration current I to the LED driver control unit... CFG And it can realize voltage detection of the signal input port. As shown in Figure 3, in this embodiment, a group address encoding detection circuit is set in at least all first and second LED driver chips. The group address encoding detection circuit includes a constant current source I. CFG The input port voltage detection circuit and address encoding circuit. The constant current source I... CFG This is used to configure current I when the signal output port of the LED driver control unit is pulled low and the voltage value is close to zero. CFG The signal output port of the LED driver control unit is supplied with a signal. The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip. The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value.

[0086] Example 3

[0087] As shown in Figure 5, the grouped single-wire series LED driving system of this embodiment includes: an LED driving control unit and multiple LED driving groups. Each LED driving group includes multiple LED driving chips, which are cascaded to form a serial communication link. Each LED driving chip has a signal input port and a signal output port. The serial communication link formed by the cascaded LED driving chips means that the signal output port of the preceding chip is connected to the signal input port of the following chip. A first-level LED driving chip is included in the serial communication link. The signal input terminal of the first-level LED driving chip is connected to the signal output port of the LED driving control unit through an address resistor. The resistance values ​​of the address resistors connected to the multiple first-level LED driving chips in the multiple LED driving groups are different.

[0088] Unlike the aforementioned embodiments, the signal output port of the LED driver control unit of the present invention is also connected to a grounding resistor. One end of the grounding resistor is connected to the signal output port of the LED driver control unit, and the other end is grounded.

[0089] In this embodiment, the method for setting group addresses for multiple LED driver groups based on the above-mentioned LED driving system includes:

[0090] After the LED driver system is powered on, the LED driver control unit is set to a high-impedance state at its control port, and simultaneously, all the first LED driver chips' signal input ports output the same configured current I to the LED driver control unit's signal output port. CFG Therefore, the input port voltages of the first LED driver chip in different LED driver groups are respectively I... CFG *(R1+nR 接地 ), I CFG *(R2+nR 接地 ), I CFG *(R3+nR 接地 ), ..., I CFG *(R n +nR 接地 ).

[0091] The first LED driver chip has a pre-stored mapping relationship between different voltage values ​​and different group addresses. The first LED driver chip determines its own group address based on the detected voltage value of the signal input port and the mapping relationship.

[0092] When the LED driver control unit sends data to different LED driver groups, the data contains the address information of the LED driver group specified by the data. All first-order LED driver chips compare the address information contained in the data with their own group address to determine whether to respond to the data.

[0093] Similar to Embodiment 1 above, in this embodiment, to ensure that each LED driver group can transmit the same configuration current I to the LED driver control unit... CFG And it can realize voltage detection of the signal input port. As shown in Figure 3, in this embodiment, a group address encoding detection circuit is set in at least all first and second LED driver chips. The group address encoding detection circuit includes a constant current source I. CFG The input port voltage detection circuit and address encoding circuit. The constant current source I... CFG This is used to configure current I when the signal output port of the LED driver control unit is pulled low and the voltage value is close to zero. CFG The signal output port of the LED driver control unit is supplied with a signal. The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip. The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value.

[0094] Example 4

[0095] As shown in Figure 6, the grouped single-wire series LED driving system of this embodiment includes: an LED driving control unit and multiple LED driving groups. Each LED driving group includes multiple LED driving chips, which are cascaded to form a serial communication link. Each LED driving chip has a signal input port and a signal output port. The serial communication link formed by the cascaded LED driving chips means that the signal output port of the preceding chip is connected to the signal input port of the following chip. A first-level LED driving chip is included in the serial communication link. The signal input terminal of the first-level LED driving chip is connected to the signal output port of the LED driving control unit through an address resistor. The resistance values ​​of the address resistors connected to the multiple first-level LED driving chips in the multiple LED driving groups are different.

[0096] Unlike the aforementioned embodiments, the signal output port of the LED driver control unit of the present invention is also connected to a grounding capacitor. One end of the grounding capacitor is connected to the signal output port of the LED driver control unit, and the other end is grounded. The capacitance value of the grounding capacitor is C.

[0097] In this embodiment, the method for setting group addresses for multiple LED driver groups based on the above-mentioned LED driving system includes:

[0098] After the LED driver system is powered on, the LED driver control unit is set to a high-impedance state at its control port, and simultaneously, all the first LED driver chips' signal input ports output the same configured current I to the LED driver control unit's signal output port for a duration T.CFG Therefore, the input port voltages of the first LED driver chip in different LED driver groups are respectively I... CFG *(R1+nT / C), I CFG *(R²+nT / C), I CFG *(R3+nT / C), ..., I CFG *(R n +nT / C).

[0099] The first LED driver chip has a pre-stored mapping relationship between different voltage values ​​and different group addresses. The first LED driver chip determines its own group address based on the detected voltage value of the signal input port and the mapping relationship.

[0100] When the LED driver control unit sends data to different LED driver groups, the data contains the address information of the LED driver group specified by the data. All first-order LED driver chips compare the address information contained in the data with their own group address to determine whether to respond to the data.

[0101] Similar to Embodiment 1 above, in this embodiment, to ensure that each LED driver group can transmit the same configuration current I to the LED driver control unit... CFG And it can realize voltage detection of the signal input port. As shown in Figure 3, in this embodiment, a group address encoding detection circuit is set in at least all first and second LED driver chips. The group address encoding detection circuit includes a constant current source I. CFG The input port voltage detection circuit and address encoding circuit. The constant current source I... CFG This is used to configure current I when the signal output port of the LED driver control unit is pulled low and the voltage value is close to zero. CFG The signal output port of the LED driver control unit is supplied with a signal. The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip. The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value.

[0102] This invention can be any possible system, method, and / or computer program product at the level of integrated technical detail. The computer program product may include a computer-readable storage medium (or media) having computer-readable program instructions thereon for causing a processor to execute aspects of the invention.

[0103] A computer-readable storage medium can be a tangible device that can hold and store instructions used by an instruction execution device. The computer-readable storage medium can be, for example, but not limited to, electronic storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, 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, random access memory (RAM), read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), a portable optical disc read-only memory (CD-ROM), a digital universal disc (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or raised structure in a groove on which instructions are recorded, and any suitable combination of the foregoing. A computer-readable storage medium, as used herein, should not be construed as a transient signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0104] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to a suitable computing / processing device, or via a network, such as the Internet, a local area network (LAN), a wide area network (WAN), and / or a wireless network, to an external computer or external storage device. This network may include copper transmission cables, optical fiber transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to a computer-readable storage medium within the suitable computing / processing device.

[0105] Computer-readable program instructions used to perform the operations of this 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 one or more programming languages ​​and any combination of procedural programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone 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 via 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., via the Internet through an Internet service provider). In some embodiments, electronic circuitry including, for example, programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs) may execute the computer-readable program instructions by utilizing state information from the computer-readable program instructions to personalize the electronic circuitry and thereby perform aspects of the invention.

[0106] This document describes aspects of the invention with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0107] These computer-readable program instructions may be provided to a processor of a computer or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions / actions specified in one or more blocks of a flowchart and / or block diagram. These computer-readable program instructions may also be stored in a computer-readable storage medium capable of instructing a computer, a programmable data processing apparatus, and / or other apparatus that operates in a particular manner, such that the computer-readable storage medium storing the instructions includes an article of manufacture comprising instructions for implementing aspects of the functions / actions specified in the flowchart and / or block diagram blocks.

[0108] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other apparatus to cause a series of operational steps to be performed on the computer, other programmable devices or other apparatuses for producing computer-implemented processes, such that the instructions executed on the computer, other programmable devices or other apparatuses perform the functions / actions specified in the flowchart and / or block diagram boxes.

[0109] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of instructions comprising one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions indicated in a block may occur outside the order indicated in the diagram. For example, two blocks shown consecutively may actually be completed as a single step, executed concurrently, substantially concurrently, in a manner that overlaps partially or entirely in time, depending on the functions involved, or sometimes these blocks may be executed in reverse order. It will also be noted that each block illustrated in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified function or action or executes a combination of dedicated hardware and computer instructions.

[0110] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in one or more flowchart illustrations and / or one or more block diagrams.

[0111] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means that implement the functions specified in one or more flowcharts and / or one or more block diagrams.

[0112] These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowcharts and / or one or more block diagrams.

Claims

An address setting method for a grouped serial LED driving system, the grouped serial LED driving system comprising: An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor. The address setting method is characterized by comprising: After the LED driving system is powered on, the LED driving control unit is instructed to pull its own signal output port down to a low level. Ensure that the signal input ports of all first-order LED driver chips output the same configuration current I to the signal output port of the LED driver control unit. CFG ; The first LED driver chip has a pre-stored mapping relationship between different voltage values ​​and different group addresses. The first LED driver chip determines its own group address based on the detected voltage value of the signal input port and the mapping relationship. When the LED driver control unit sends data to different LED driver groups, the data contains the address information of the LED driver group specified by the data. All first-order LED driver chips compare the address information contained in the data with their own group address to determine whether to respond to the data. The address setting method according to claim 1 is characterized in that, The LED driver control unit is also provided with a control port and a switch control tube. The gate of the switch control tube is connected to the control port, its drain is connected to the signal output port of the LED driver control unit, and its source is grounded. An address setting method for a grouped serial LED driving system, the grouped serial LED driving system comprising: An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor. The signal output port of the LED driver control unit is also connected to a grounding resistor; one end of the grounding resistor is connected to the signal output port of the LED driver control unit and the other end is grounded. The address setting method is characterized by comprising: After the LED driving system is powered on, the LED driving control unit is set to a high-impedance state at the control port. Ensure that the signal input ports of all first-order LED driver chips output the same configuration current I to the signal output port of the LED driver control unit. CFG ; The first LED driver chip has a pre-stored mapping relationship between different voltage values ​​and different group addresses. The first LED driver chip determines its own group address based on the detected voltage value of the signal input port and the mapping relationship. When the LED driver control unit sends data to different LED driver groups, the data contains the address information of the LED driver group specified by the data. All first-order LED driver chips compare the address information contained in the data with their own group address to determine whether to respond to the data. An address setting method for a grouped serial LED driving system, the grouped serial LED driving system comprising: An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor. The signal output port of the LED driver control unit is also connected to a grounding capacitor; one end of the grounding capacitor is connected to the signal output port of the LED driver control unit and the other end is grounded. The address setting method is characterized by comprising: After the LED driving system is powered on, the LED driving control unit is set to a high-impedance state at the control port. Ensure that the signal input ports of all first-order LED driver chips output the same configuration current I to the signal output port of the LED driver control unit. CFG ; The first LED driver chip has a pre-stored mapping relationship between different voltage values ​​and different group addresses. The first LED driver chip determines its own group address based on the detected voltage value of the signal input port and the mapping relationship. When the LED driver control unit sends data to different LED driver groups, the data contains the address information of the LED driver group specified by the data. All first-order LED driver chips compare the address information contained in the data with their own group address to determine whether to respond to the data. A grouped serial LED driving system, characterized in that, The grouped serial LED driving system includes: An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor. The first LED driver chip is equipped with a group address encoding detection circuit, which includes a constant current source I. CFG Input port voltage detection circuit and address encoding circuit; The constant current source I CFG Used to configure current I when the signal output port of the LED driver control unit is pulled low. CFG The signal output port that supplies signals to the LED driver control unit; The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip; The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value. A grouped serial LED driving system, characterized in that, The grouped serial LED driving system includes: An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor. The LED driver control unit is also provided with a control port and a switch control tube. The gate of the switch control tube is connected to the control port, its drain is connected to the signal output port of the LED driver control unit, and its source is grounded. The first LED driver chip is equipped with a group address encoding detection circuit, which includes a constant current source I. CFG Input port voltage detection circuit and address encoding circuit; The constant current source I CFG Used to configure current I when the signal output port of the LED driver control unit is pulled low. CFG The signal output port that supplies signals to the LED driver control unit; The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip; The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value. A grouped serial LED driving system, characterized in that, The grouped serial LED driving system includes: An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor. The signal output port of the LED driver control unit is also connected to a grounding resistor; one end of the grounding resistor is connected to the signal output port of the LED driver control unit and the other end is grounded. The first LED driver chip is equipped with a group address encoding detection circuit, which includes a constant current source I. CFG Input port voltage detection circuit and address encoding circuit; The constant current source I CFG Used to configure the current I when the signal output port of the LED driver control unit is in a high-impedance state. CFG The signal output port that supplies signals to the LED driver control unit; The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip; The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value. A grouped serial LED driving system, characterized in that, The grouped serial LED driving system includes: An LED driver control unit and multiple LED driver groups, wherein each LED driver group includes multiple LED driver chips, the LED driver chips are cascaded to form a serial communication link, and a first LED driver chip is provided in the serial communication link. The signal input terminal of the first LED driver chip is connected to the signal output port of the LED driver control unit through an address resistor. The signal output port of the LED driver control unit is also connected to a grounding capacitor; one end of the grounding capacitor is connected to the signal output port of the LED driver control unit and the other end is grounded. The first LED driver chip is equipped with a group address encoding detection circuit, which includes a constant current source I. CFG Input port voltage detection circuit and address encoding circuit; The constant current source I CFG Used to configure the current I when the signal output port of the LED driver control unit is in a high-impedance state. CFG The signal output port that supplies signals to the LED driver control unit; The input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driver chip; The address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and to determine the group address of the first LED driver chip based on the detected voltage value. An LED backlight panel, the LED backlight panel comprising an LED driving system as described in any one of claims 5-8. An LED display device, the LED display device comprising the backlight panel as described in claim 9.

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