Address setting method, LED driving system and backlight device

Abstract

The invention discloses an address setting method, an LED driving system and a backlight device, and particularly relates to an address setting method suitable for a grouped serial LED driving system, the grouped serial LED driving system comprises a serial communication link formed by cascading a plurality of LED driving chips, the signal input end of the first LED driving chip is connected to the signal output port of the LED driving control unit through an address resistor; and when the LED driving chips are electrified, configuration current from the signal input port of the first LED driving chip to the LED driving control unit is formed, so that different voltages are formed at the signal input port of the first LED driving chip. And the first LED driving chip identifies the grouping address of the first LED driving chip through different voltage values. According to the invention, the scheme that the chip completes coding of different addresses according to the position in packet communication is realized by utilizing the existing port, the communication efficiency is improved, the wiring complexity of the system is reduced, and the system cost is reduced.

Description

Technical Field

[0001] The present 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 Art

[0002] In existing large-scale LED display systems, the communication system composed of LED driver control units and multiple LED driver chips often uses a single-line serial transmission line to achieve communication. This single-line serial transmission method is based on a single-line communication protocol and uses data encoding measures to achieve the transmission of RGB three-color signals and other signals on a data transmission channel. Figure 1 As shown, the LED drive control unit (i.e., the MCU shown in the figure) and multiple LED drive chips (i.e. Figure 1 The IC11 to IC4n chips shown in the figure are connected in series through a single line, and each LED driver chip is connected with 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, and the transmitting end of the first LED driver chip is connected to the receiving end of the second LED driver chip, and then the next LED driver chip is connected in sequence. In this way, an LED driver system is formed. The communication principle of the communication system is that the LED driver control unit encodes the signals required to be transmitted to each LED driver chip with a set of serial frame data, and 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, and then constructs the decoded data into a new frame data as output, re-encodes it according to the communication mode and instruction type, and sends it to the LED driver chip with a valid subsequent address to complete a communication task. This communication system reduces the lines required for data transmission, and achieves the purpose of simplifying the lines, reducing ports, and reducing costs.

[0003] However, as the number of pixels in the LED display system increases and the number of LED driver chips increases accordingly, the current single-line serial transmission method requires more LED driver chips to be connected in series on a single line. This is because each chip in the single-line communication needs to decode the data sent by the previous chip and then re-encode it and send 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 drop in communication efficiency and a reduction in the refresh frequency of pixels.

[0004] It can be seen that a new LED driving system, namely an address setting system for LED driving chips, is needed in the prior art, so as to improve the communication efficiency and pixel refresh rate when the number of LED driving chips increases significantly. Summary of the invention

[0005] The technical purpose to be achieved by the present invention is to provide an address setting method, an LED driving system, and a backlight device. Aiming at the shortcomings of the existing single-line serial communication method in terms of low communication efficiency and low pixel refresh frequency under more pixel points, the full single-line serial communication method is optimized by setting addresses to a method in which an LED driving control unit and several groups of LED driving chips communicate separately, thereby achieving the purpose of greatly improving communication efficiency and pixel refresh rate.

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

[0007] An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor;

[0008] The address setting method comprises:

[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 state;

[0010] Make the signal input ports of all the first 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 pre-stores a mapping relationship between different voltage values ​​and different group addresses, and the first LED driver chip determines its own group address according to the voltage value of the detected signal input port and the mapping relationship;

[0012] When the LED driving control unit sends data to different LED driving groups, the data contains the address information of the LED driving group specified by the data. All the first LED driving 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 driving 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, the drain is connected to the signal output port of the LED driving control unit, and the source is grounded.

[0014] The present invention also provides another address setting method applicable to a grouped serial LED driving system, wherein the grouped serial LED driving system comprises:

[0015] An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor;

[0016] At the same time, the signal output port of the LED driving 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 driving control unit and the other end is grounded;

[0017] The address setting method comprises:

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

[0019] Make the signal input ports of all the first 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 pre-stores a mapping relationship between different voltage values ​​and different group addresses, and the first LED driver chip determines its own group address according to the voltage value of the detected signal input port and the mapping relationship;

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

[0022] The present invention also provides another address setting method applicable to a grouped serial LED driving system, wherein the grouped serial LED driving system comprises:

[0023] An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor;

[0024] The signal output port of the LED driving 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 driving control unit and the other end is grounded;

[0025] The address setting method comprises:

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

[0027] Make the signal input ports of all the first 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 pre-stores a mapping relationship between different voltage values ​​and different group addresses, and the first LED driver chip determines its own group address according to the voltage value of the detected signal input port and the mapping relationship;

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

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

[0031] An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor;

[0032] The first LED driver chip is provided with a group address coding detection circuit, and the group address coding detection circuit includes a constant current source I CFG , input port voltage detection circuit and address encoding circuit;

[0033] The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is pulled down to a low level. CFG A signal output port for transmitting to the LED drive 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 determine the group address of the first LED driver chip according to the detected voltage value.

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

[0037] An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor;

[0038] The LED driving 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, the drain is connected to the signal output port of the LED driving control unit, and the source is grounded;

[0039] The first LED driver chip is provided with a group address coding detection circuit, and the group address coding detection circuit includes a constant current source I CFG , input port voltage detection circuit and address encoding circuit;

[0040] The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is pulled down to a low level. CFG A signal output port for transmitting to the LED drive 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 determine the group address of the first LED driver chip according to the detected voltage value.

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

[0044] An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor;

[0045] The signal output port of the LED driving 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 driving control unit and the other end is grounded;

[0046] The first LED driver chip is provided with a group address coding detection circuit, and the group address coding detection circuit includes a constant current source I CFG , input port voltage detection circuit and address encoding circuit;

[0047] The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is in high impedance state. CFG A signal output port for transmitting to the LED drive 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 determine the group address of the first LED driver chip according to the detected voltage value.

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

[0051] An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor;

[0052] The signal output port of the LED driving 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 driving control unit and the other end is grounded;

[0053] The first LED driver chip is provided with a group address coding detection circuit, and the group address coding detection circuit includes a constant current source I CFG , input port voltage detection circuit and address encoding circuit;

[0054] The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is in high impedance state. CFG A signal output port for transmitting to the LED drive 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 determine the group address of the first LED driver chip according to the detected voltage value.

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

[0058] The present invention aims at the shortcomings of the communication system of the current ultra-large LED display system, that is, the communication efficiency and the pixel refresh frequency decrease as the number of pixels increases. The concept of packet communication is proposed, and the existing ports are used to solve the solution of implementing different address encodings of chips according to their locations in packet communication, thereby improving the communication efficiency, reducing the complexity of system wiring, and reducing the system cost.

[0059] 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

[0060] 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:

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

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

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

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

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

[0066] Figure 6 is a structural schematic diagram of a grouped serial LED driving system according to a fourth embodiment; DETAILED DESCRIPTION

[0067] 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.

[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 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.

[0069] 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.

[0070] 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.

[0071] Example 1

[0072] like Figure 2As shown, the grouped single-line series LED driving system of this embodiment includes: an LED driving control unit and multiple LED driving groups, the LED driving group includes multiple LED driving chips, the LED driving chips are cascaded to form a serial communication link, each of the LED driving chips is provided with a signal input port DI and a signal output port DO, and the serial communication link formed by the cascade of the LED driving chips means: the signal output port of the previous chip is connected to the signal input port of the next chip. A first LED driving chip is provided in the serial communication link, and the signal input end of the first LED driving chip is connected to the signal output port of the LED driving control unit through an address resistor. The address resistors connected to the multiple first LED driving chips in the multiple LED driving groups have different resistance values.

[0073] In this embodiment, a method for setting group addresses for multiple LED drive groups based on the above LED drive system includes:

[0074] After the LED drive system is powered on, the LED drive control unit is made to pull down its own signal output port to a low level state. When the signal output port of the LED drive control unit is pulled down to a low level and the voltage value is close to zero, the signal input ports of all the first LED drive chips are made to output the same configuration current I to the signal output port of the LED drive control unit. CFG Therefore, the voltages of the input ports of the first LED driver chips of different LED driver groups are I CFG *R1,I CFG *R2,I CFG *R3,……,I CFG *R n .

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

[0076] When the LED driving control unit sends data to different LED driving groups, the data contains the address information of the LED driving group specified by the data. All the first LED driving 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, in order to realize that each LED driving group can transmit the same configuration current I to the LED driving control unit CFG , and can realize voltage detection of signal input port. Figure 3As shown, in this embodiment, at least all the first LED driver chips are provided with a group address code detection circuit, and the group address code detection circuit includes a constant current source I CFG , input port voltage detection circuit and address coding circuit. The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is pulled down to a low level and the voltage value is close to zero. CFG The signal output port is transmitted to the LED driving control unit, the input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driving chip, the address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and determine the group address of the first LED driving chip according to the detected voltage value.

[0078] Example 2

[0079] like Figure 4 As shown, the grouped single-line series LED driving system of this embodiment includes: an LED driving control unit and multiple LED driving groups, the LED driving group includes multiple LED driving chips, the LED driving chips are cascaded to form a serial communication link, each of the LED driving chips is provided with a signal input port and a signal output port, and the serial communication link formed by the cascade of the LED driving chips means: the signal output port of the previous chip is connected to the signal input port of the next chip. A first LED driving chip is provided in the serial communication link, and the signal input end of the first LED driving chip is connected to the signal output port of the LED driving control unit through an address resistor. The address resistors connected to the multiple first LED driving chips in the multiple LED driving groups have different resistance values.

[0080] Different from the above-mentioned embodiments, the LED driving control unit of the present invention is further provided with a control port G1 and a switch control tube N1, wherein 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 driving control unit, and the source is grounded.

[0081] In this embodiment, a method for setting group addresses for multiple LED drive groups based on the above LED drive system includes:

[0082] After the LED drive system is powered on, the LED drive control unit is made to output a high level state from the control port, so that the control switch tube is in a conducting state, and the voltage of the signal output port of the LED drive control unit is pulled to zero, and at the same time, the signal input ports of all the first LED drive chips output the same configuration current I to the signal output port of the LED drive control unit. CFGTherefore, the voltages of the input ports of the first LED driver chips of different LED driver groups are I CFG *R1,I CFG *R2,I CFG *R3,……,I CFG *R n .

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

[0084] When the LED driving control unit sends data to different LED driving groups, the data contains the address information of the LED driving group specified by the data. All the first LED driving 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 the above-mentioned embodiment 1, in this embodiment, in order to realize that each LED driving group can transmit the same configuration current I to the LED driving control unit CFG , and can realize voltage detection of signal input port. Figure 3 As shown, in this embodiment, at least all the first LED driver chips are provided with a group address code detection circuit, and the group address code detection circuit includes a constant current source I CFG , input port voltage detection circuit and address coding circuit. The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is pulled down to a low level and the voltage value is close to zero. CFG The signal output port is transmitted to the LED driving control unit, the input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driving chip, the address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and determine the group address of the first LED driving chip according to the detected voltage value.

[0086] Example 3

[0087] like Figure 5As shown, the grouped single-line series LED driving system of this embodiment includes: an LED driving control unit and multiple LED driving groups, the LED driving group includes multiple LED driving chips, the LED driving chips are cascaded to form a serial communication link, each of the LED driving chips is provided with a signal input port and a signal output port, and the serial communication link formed by the cascade of the LED driving chips means: the signal output port of the previous chip is connected to the signal input port of the next chip. A first LED driving chip is provided in the serial communication link, and the signal input end of the first LED driving chip is connected to the signal output port of the LED driving control unit through an address resistor. The address resistors connected to the multiple first LED driving chips in the multiple LED driving groups have different resistance values.

[0088] Different from the above-mentioned embodiments, the signal output port of the LED driving control unit of the present invention is further connected to a grounding resistor, one end of which is connected to the signal output port of the LED driving control unit and the other end is grounded.

[0089] In this embodiment, a method for setting group addresses for multiple LED drive groups based on the above LED drive system includes:

[0090] After the LED drive system is powered on, the LED drive control unit is set to a high impedance state by controlling the control port, and at the same time, the signal input ports of all the first LED drive chips output the same configuration current I to the signal output port of the LED drive control unit. CFG Therefore, the voltages of the input ports of the first LED driver chips of different LED driver groups are 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 pre-stores a mapping relationship between different voltage values ​​and different group addresses, and the first LED driver chip determines its own group address according to the detected voltage value of the signal input port and the mapping relationship.

[0092] When the LED driving control unit sends data to different LED driving groups, the data contains the address information of the LED driving group specified by the data. All the first LED driving 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 the above-mentioned embodiment 1, in this embodiment, in order to realize that each LED driving group can transmit the same configuration current I to the LED driving control unit CFG , and can realize voltage detection of signal input port. Figure 3 As shown, in this embodiment, at least all the first LED driver chips are provided with a group address code detection circuit, and the group address code detection circuit includes a constant current source I CFG , input port voltage detection circuit and address coding circuit. The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is pulled down to a low level and the voltage value is close to zero. CFG The signal output port is transmitted to the LED driving control unit, the input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driving chip, the address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and determine the group address of the first LED driving chip according to the detected voltage value.

[0094] Example 4

[0095] like Figure 6 As shown, the grouped single-line series LED driving system of this embodiment includes: an LED driving control unit and multiple LED driving groups, the LED driving group includes multiple LED driving chips, the LED driving chips are cascaded to form a serial communication link, each of the LED driving chips is provided with a signal input port and a signal output port, and the serial communication link formed by the cascade of the LED driving chips means: the signal output port of the previous chip is connected to the signal input port of the next chip. A first LED driving chip is provided in the serial communication link, and the signal input end of the first LED driving chip is connected to the signal output port of the LED driving control unit through an address resistor. The address resistors connected to the multiple first LED driving chips in the multiple LED driving groups have different resistance values.

[0096] Different from the above embodiments, the signal output port of the LED driving control unit of the present invention is further connected to a grounding capacitor. One end of the grounding capacitor is connected to the signal output port of the LED driving control unit and the other end is grounded. The capacitance value of the grounding capacitor is C.

[0097] In this embodiment, a method for setting group addresses for multiple LED drive groups based on the above LED drive system includes:

[0098] After the LED drive system is powered on, the LED drive control unit is set to a high impedance state through the control port, and at the same time, the signal input ports of all the first LED drive chips output the same configuration current I to the signal output port of the LED drive control unit within a time period T. CFG Therefore, the voltages of the input ports of the first LED driver chips of different LED driver groups are 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 pre-stores a mapping relationship between different voltage values ​​and different group addresses, and the first LED driver chip determines its own group address according to the detected voltage value of the signal input port and the mapping relationship.

[0100] When the LED driving control unit sends data to different LED driving groups, the data contains the address information of the LED driving group specified by the data. All the first LED driving 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 the above-mentioned embodiment 1, in this embodiment, in order to realize that each LED driving group can transmit the same configuration current I to the LED driving control unit CFG , and can realize voltage detection of signal input port. Figure 3 As shown, in this embodiment, at least all the first LED driver chips are provided with a group address code detection circuit, and the group address code detection circuit includes a constant current source I CFG , input port voltage detection circuit and address coding circuit. The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is pulled down to a low level and the voltage value is close to zero. CFG The signal output port is transmitted to the LED driving control unit, the input port voltage detection circuit is used to detect the voltage of the signal input port of the first LED driving chip, the address encoding circuit is used to store the mapping relationship between different voltage values ​​and different group addresses, and determine the group address of the first LED driving chip according to the detected voltage value.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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.

[0112] 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 A step that specifies a function in one or more boxes.

Claims

1. An address setting method applicable to a grouped serial LED driving system, the grouped serial LED driving system comprising: An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor; Characterized in that the address setting method comprises: 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 state; Make the signal input ports of all the first 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 pre-stores a mapping relationship between different voltage values ​​and different group addresses, and the first LED driver chip determines its own group address according to the voltage value of the detected signal input port and the mapping relationship; When the LED driving control unit sends data to different LED driving groups, the data contains the address information of the LED driving group specified by the data. All the first LED driving chips compare the address information contained in the data with their own group address to determine whether to respond to the data.

2. The address setting method according to claim 1, characterized in that: The LED driving 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, the drain is connected to the signal output port of the LED driving control unit, and the source is grounded.

3. An address setting method applicable to a grouped serial LED driving system, the grouped serial LED driving system comprising: An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor; The signal output port of the LED driving 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 driving control unit and the other end is grounded; Characterized in that the address setting method comprises: After the LED driving system is powered on, the LED driving control unit is set to a high impedance state through a control port; Make the signal input ports of all the first 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 pre-stores a mapping relationship between different voltage values ​​and different group addresses, and the first LED driver chip determines its own group address according to the voltage value of the detected signal input port and the mapping relationship; When the LED driving control unit sends data to different LED driving groups, the data contains the address information of the LED driving group specified by the data. All the first LED driving chips compare the address information contained in the data with their own group address to determine whether to respond to the data.

4. An address setting method applicable to a grouped serial LED driving system, the grouped serial LED driving system comprising: An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor; The signal output port of the LED driving 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 driving control unit and the other end is grounded; Characterized in that the address setting method comprises: After the LED driving system is powered on, the LED driving control unit is set to a high impedance state through a control port; Make the signal input ports of all the first 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 pre-stores a mapping relationship between different voltage values ​​and different group addresses, and the first LED driver chip determines its own group address according to the voltage value of the detected signal input port and the mapping relationship; When the LED driving control unit sends data to different LED driving groups, the data contains the address information of the LED driving group specified by the data. All the first LED driving chips compare the address information contained in the data with their own group address to determine whether to respond to the data.

5. A grouped serial LED driving system, characterized in that: The grouped serial LED driving system comprises: An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor; The first LED driver chip is provided with a group address coding detection circuit, and the group address coding detection circuit includes a constant current source I CFG , input port voltage detection circuit and address encoding circuit; The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is pulled down to a low level. CFG A signal output port for transmitting to the LED drive 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 determine the group address of the first LED driver chip according to the detected voltage value.

6. A grouped serial LED driving system, characterized in that: The grouped serial LED driving system comprises: An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor; The LED driving 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, the drain is connected to the signal output port of the LED driving control unit, and the source is grounded; The first LED driver chip is provided with a group address coding detection circuit, and the group address coding detection circuit includes a constant current source I CFG , input port voltage detection circuit and address encoding circuit; The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is pulled down to a low level. CFG A signal output port for transmitting to the LED drive 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 determine the group address of the first LED driver chip according to the detected voltage value.

7. A grouped serial LED driving system, characterized in that: The grouped serial LED driving system comprises: An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor; The signal output port of the LED driving 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 driving control unit and the other end is grounded; The first LED driver chip is provided with a group address coding detection circuit, and the group address coding detection circuit includes a constant current source I CFG , input port voltage detection circuit and address encoding circuit; The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is in high impedance state. CFG A signal output port for transmitting to the LED drive 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 determine the group address of the first LED driver chip according to the detected voltage value.

8. A grouped serial LED driving system, characterized in that: The grouped serial LED driving system comprises: An LED driving control unit and a plurality of LED driving groups, wherein the LED driving group comprises a plurality of LED driving chips, wherein the LED driving chips are cascaded to form a serial communication link, wherein a first LED driving chip is provided in the serial communication link, and a signal input end of the first LED driving chip is connected to a signal output port of the LED driving control unit through an address resistor; The signal output port of the LED driving 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 driving control unit and the other end is grounded; The first LED driver chip is provided with a group address coding detection circuit, and the group address coding detection circuit includes a constant current source I CFG , input port voltage detection circuit and address encoding circuit; The constant current source I CFG It is used to configure the current I when the signal output port of the LED drive control unit is in high impedance state. CFG A signal output port for transmitting to the LED drive 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 determine the group address of the first LED driver chip according to the detected voltage value.

9. An LED backlight panel, comprising the LED driving system according to any one of claims 5 to 8.

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

Images