Information reading method and device of LED driver and backlight control system

Abstract

The invention discloses an information reading method and device of an LED driver and a backlight control system, and the method comprises the steps: a BCON sends a vertical synchronizing signal to at least one LED driving branch, so that the at least one LED driving branch conducts a first directional path or a second directional path according to the level state of the vertical synchronizing signal; when the first directional path is conducted, the BCON transmits an information reading instruction and address information corresponding to the information reading instruction step by step through the first directional path, so that at least one LED driving branch circuit determines whether itself is a target LED driver or not according to the received address information, and when the second directional path is conducted, the BCON determines itself is the target LED driver; and in response to the information reading instruction, reading own data information, and transmitting the data information to the BCON step by step through the second directional path, thereby realizing reading of information stored in the LED driver with variable data transmission direction in the backlight control system.

Description

Technical Field

[0001] The present invention relates to the technical field of backlight display, and in particular to an information reading method and device of an LED driver and a backlight control system. Background Art

[0002] A liquid crystal display (LCD) is a display that uses liquid crystal as the display panel material. Since liquid crystal does not have the property of self-luminescence, it is usually necessary to provide a backlight source for the liquid crystal panel (LCP). However, the backlight source will cause the LCD to have problems such as impure black and poor contrast.

[0003] In order to improve the display effect of LCD, a backlight control system is introduced in LCD. The backlight control system usually includes a backlight drive controller (BCON) and a backlight unit (BLU), wherein the backlight unit is divided into multiple backlight partitions, each of which includes an LED (Light Emitting Diode) driver (LED Driver) and at least one LED electrically connected to the LED driver. BCON uses local dimming to independently control the LED drivers in multiple backlight partitions, so that each LED driver adjusts the LED electrically connected to itself to a suitable brightness, making the dark picture area darker and the bright picture area brighter, so as to improve the contrast of LCD.

[0004] In the above-mentioned backlight control system, BCON needs to read the information of the specified LED driver. The information reading method of the LED driver in the related art is only applicable to the backlight control system of the LED driver with a fixed data transmission direction, and is not applicable to the backlight control system of the LED driver with a variable data transmission direction. Summary of the invention

[0005] The present invention provides an information reading method and device of an LED driver and a backlight control system, which are used to realize the reading of information stored in an LED driver with variable data transmission direction in the backlight control system.

[0006] In a first aspect, an embodiment of the present invention provides an information reading method of an LED driver, which is applied to a backlight control system, wherein the backlight control system includes a BCON and a backlight unit, wherein the backlight unit includes a plurality of LED driving branches arranged in parallel, and each LED driving branch includes a plurality of LED drivers arranged in cascade;

[0007] The BCON sends a vertical synchronization signal to at least one LED driving branch, so that the at least one LED driving branch conducts a first directional path or a second directional path according to the level state of the vertical synchronization signal, wherein the first directional path and the second directional path are two paths in the LED driving branch that are opposite to each other;

[0008] When the first directional path is turned on, the BCON transmits the information reading instruction and the address information corresponding to the information reading instruction step by step through the first directional path, so that at least one LED driving branch determines whether it is the target LED driver according to the received address information. When the second directional path is turned on, when it determines that it is the target LED driver, it responds to the information reading instruction, reads its own data information, and transmits the read data information to the BCON step by step through the second directional path.

[0009] In the information reading method of the LED driver provided by the embodiment of the present invention, under the control of the vertical synchronization signal sent by BCON, each LED driver in the LED driving branch determines its own data transmission direction, thereby turning on the first directional path or the second directional path, and BCON transmits the information reading instruction and the address information corresponding to the information reading instruction to each LED driver step by step through the turned-on first directional path. Each LED driver detects whether it is the target LED driver based on the received address information, and when the second directional path is turned on, the LED driver that determines itself as the target LED driver responds to the information reading instruction, reads its own data information, and transmits the read data information to BCON through the second directional path, thereby realizing the reading of the information stored in the LED driver with variable data transmission direction in the backlight control system.

[0010] In an optional implementation manner, the at least one LED driving branch determines whether it is a target LED driver according to the received address information, including:

[0011] For any LED driving branch, each LED driver in the LED driving branch compares the target address stored in itself with the received address information;

[0012] If the address information is equal to the target address stored in the LED driver itself, then the LED driver is determined to be the target LED driver;

[0013] If the address information is not equal to the target address stored in the LED driver itself, it is determined that the LED driver is a non-target LED driver.

[0014] In the above method, after each LED driver in the backlight control system receives the information reading instruction and the address information corresponding to the information reading instruction, it compares the target address stored in itself with the received address information. If the LED driver determines that the received address information is equal to the target address stored in itself, then the LED driver determines that it is the target LED driver; if the LED driver determines that the received address information is not equal to the target address stored in itself, then the LED driver determines that it is not the target LED driver.

[0015] In an optional implementation, the target address stored in the LED driver itself is determined in the following manner:

[0016] The BCON sends a vertical synchronization signal to at least one LED driving branch, so that the at least one LED driving branch conducts the first directional path or the second directional path according to the level state of the vertical synchronization signal;

[0017] When the first directional path is turned on, the BCON transmits the addressing instruction step by step through the first directional path. When the second directional path is turned on, starting from the last level of LED driver, it responds to the addressing instruction, generates address data signals step by step, and transmits the address data signals to the BCON through the second directional path, so that each LED driver stores the address information in the address data signal generated by itself as its own target address.

[0018] In the above method, BCON transmits the addressing instruction to each LED driver step by step through the first directional path that is turned on, and after the second directional path is turned on, the last-level LED driver of each LED driving branch is turned on to respond to the addressing instruction, and the address data signal is generated step by step. Each LED driver determines its own target address according to the address data signal generated by itself, until the address data signal is transmitted to BCON through the second directional path, thereby realizing the determination of the target address of each LED driver in the backlight control system.

[0019] In an optional implementation, when the second directional path is turned on, starting from the last LED driver, in response to the addressing instruction, the address data signal is generated step by step, including:

[0020] When the second directional path is turned on, the last LED driver in the LED driving branch generates the address data signal according to the first preset address in response to the addressing instruction;

[0021] The non-last-stage LED driver in the LED driving branch generates the address data signal in response to the addressing instruction according to the sum of a preset step value and address information in the address data signal received by the non-last-stage LED driver.

[0022] In the above method, in each LED driver in the backlight control system, if it is confirmed that it is the last-stage LED driver, it will respond to the addressing instruction and generate an address data signal, and the address information in the address data signal is the first preset address; if it is confirmed that it is not the last-stage LED driver, it will respond to the addressing instruction and generate an address data signal, and the address information in the address data signal is determined according to the sum of the preset step value and the address information in the address data signal received by the LED driver. In the above manner, each LED driver generates an address data signal for determining the target address.

[0023] In an optional embodiment, the method further includes:

[0024] For any LED driving branch, each LED driver in the LED driving branch compares the target address stored in itself with the received address information. If the address information is greater than the target address stored in the LED driver itself, the designated input and output pins of the LED driver are set to a preset level.

[0025] In the above method, after each LED driver in the backlight control system receives the information reading instruction and the address information corresponding to the information reading instruction, it compares the target address stored in itself with the received address information. If the LED driver determines that the received address information is greater than the target address stored in itself, the designated input and output pins of the LED driver are set to a preset level to ensure that the LED driver is in an idle state and ensure the normal information reading.

[0026] In an optional implementation, the at least one LED driving branch conducts the first directional path or the second directional path according to the level state of the vertical synchronization signal, including:

[0027] If the LED driving branch determines that the level state of the vertical synchronization signal is a first level state, then the first directional path is turned on;

[0028] If the LED driving branch determines that the level state of the vertical synchronization signal is the second level state, the second directional path is turned on.

[0029] In the above method, when the vertical synchronization signal is in the first level state, the first input and output pins of each LED driver in the LED driving branch are controlled to be input pins, and the second input and output pins of each LED driver are controlled to be output pins, so as to realize the conduction of the first directional path, that is, the first directional path is the path from BCON to the last LED driver in the LED driving branch; when the vertical synchronization signal is in the second level state, the second input and output pins of each LED driver in the LED driving branch are controlled to be input pins, and the first input and output pins of each LED driver are controlled to be output pins, so as to realize the conduction of the second directional path, that is, the second directional path is the path from the last LED driver in the LED driving branch to BCON. Through the above vertical synchronization signal, the data transmission direction of each LED driver is variable, thereby realizing the conduction of the first directional path or the conduction of the second directional path.

[0030] In a second aspect, an embodiment of the present invention provides an information reading device of an LED driver, which is applied to a backlight control system, wherein the backlight control system includes a BCON and a backlight unit, wherein the backlight unit includes a plurality of LED driving branches arranged in parallel, each LED driving branch includes a plurality of LED drivers arranged in cascade, and the device includes:

[0031] A signal sending module, used for sending a vertical synchronization signal to at least one LED driving branch, so that at least one LED driving branch conducts a first directional path or a second directional path according to the level state of the vertical synchronization signal, wherein the first directional path and the second directional path are two paths in the LED driving branch that are opposite to each other;

[0032] The information reading module is used for, when the first directional path is turned on, the BCON transmits the information reading instruction and the address information corresponding to the information reading instruction step by step through the first directional path, so that at least one LED driving branch determines whether it is the target LED driver according to the received address information, and when the second directional path is turned on, when it determines that it is the target LED driver, responds to the information reading instruction, reads its own data information, and transmits the read data information to the BCON step by step through the second directional path.

[0033] In an optional implementation, the information reading module is specifically used to:

[0034] For any LED driving branch, each LED driver in the LED driving branch compares the target address stored in itself with the received address information. If the address information is equal to the target address stored in the LED driver itself, the LED driver is determined to be the target LED driver.

[0035] In an optional implementation, the device further includes an addressing module, and the addressing module determines the target address stored in the LED driver itself in the following manner:

[0036] The BCON sends a vertical synchronization signal to at least one LED driving branch, so that the at least one LED driving branch conducts the first directional path or the second directional path according to the level state of the vertical synchronization signal;

[0037] When the first directional path is turned on, the BCON transmits the addressing instruction step by step through the first directional path. When the second directional path is turned on, starting from the last level of LED driver, it responds to the addressing instruction, generates address data signals step by step, and transmits the address data signals to the BCON through the second directional path, so that each LED driver stores the address information in the address data signal generated by itself as its own target address.

[0038] In an optional implementation, the addressing module is specifically used for:

[0039] When the second directional path is turned on, the last LED driver in the LED driving branch generates the address data signal according to the first preset address in response to the addressing instruction;

[0040] The non-last-stage LED driver in the LED driving branch generates the address data signal in response to the addressing instruction according to the sum of a preset step value and address information in the address data signal received by the non-last-stage LED driver.

[0041] In an optional embodiment, the device further includes a pin setting module;

[0042] The pin setting module is used for comparing the target address stored in itself with the received address information for each LED driver in any LED driver branch;

[0043] If the address information is greater than the target address stored in the LED driver itself, the designated input and output pins of the LED driver are set to a preset level;

[0044] If the address information is not greater than the target address stored in the LED driver itself, the LED driver will not be processed.

[0045] In an optional implementation, the signal sending module is specifically used to:

[0046] If the LED driving branch determines that the level state of the vertical synchronization signal is a first level state, then the first directional path is turned on;

[0047] If the LED driving branch determines that the level state of the vertical synchronization signal is the second level state, then the second directional path is turned on;

[0048] The first level state and the second level state are different.

[0049] In a third aspect, an embodiment of the present invention provides an electronic device, including:

[0050] A memory for storing executable instructions;

[0051] The processor is used to read and execute the executable instructions stored in the memory to implement the steps of the information reading method of the LED driver as described in any one of the embodiments of the first aspect above.

[0052] In a fourth aspect, an embodiment of the present invention provides a backlight control system, including a BCON and a backlight unit, wherein the backlight unit includes a plurality of LED driving branches arranged in parallel, and each LED driving branch includes a plurality of LED drivers arranged in cascade;

[0053] The backlight control system is used to execute the steps of the information reading method of the LED driver as described in any one of the embodiments of the first aspect above.

[0054] In a fifth aspect, an embodiment of the present invention provides a computer-readable storage medium. When instructions in the storage medium are executed by a processor, the processor is enabled to perform the steps of the information reading method of the LED driver as described in any one of the embodiments in the first aspect above.

[0055] For the technical effects that may be achieved by the information reading device of the LED driver disclosed in the second aspect, the backlight control system disclosed in the third aspect of the electronic device disclosed in the fourth aspect, and the computer-readable storage medium disclosed in the fifth aspect, please refer to the technical effects that can be achieved by the first aspect or various possible schemes in the first aspect, and they will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0057] Figure 1A schematic diagram of the structure of a backlight control system provided by an embodiment of the present invention;

[0058] Figure 2 A schematic diagram of the structure of any LED driver in a backlight control system provided by an embodiment of the present invention;

[0059] Figure 3 A schematic diagram of the internal structure of any LED driver in a backlight control system provided by an embodiment of the present invention;

[0060] Figure 4 A schematic diagram of the structure of another backlight control system provided by an embodiment of the present invention;

[0061] Figure 5 A transmission schematic diagram of a first directional path based on a backlight control system provided by an embodiment of the present invention;

[0062] Figure 6 A transmission schematic diagram of a second directional path based on a backlight control system provided by an embodiment of the present invention;

[0063] Figure 7 A schematic diagram of the states of input and output pins of an LED driver provided by an embodiment of the present invention;

[0064] Figure 8 A schematic diagram of the structure of another backlight control system provided by an embodiment of the present invention;

[0065] Fig. 9 A flowchart of an information reading method of an LED driver provided by an embodiment of the present invention;

[0066] Fig.10 A schematic diagram of signal waveforms of each LED driver in any LED driving branch in a backlight control system provided by an embodiment of the present invention;

[0067] Fig.11 A schematic diagram of the module structure of an information reading device for an LED driver provided by an embodiment of the present invention;

[0068] Fig.12 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention;

[0069] Fig.13 A schematic diagram of the structure of another backlight control system provided by an embodiment of the present invention;

[0070] Fig.14 A schematic diagram of a program product of an information reading method of an LED driver provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0071] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0072] Furthermore, in the description of the embodiments of the present invention, unless otherwise specified, “ / ” means or. For example, A / B can mean A or B. The “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present invention, “plurality” refers to two or more than two.

[0073] In the following, the terms "first" and "second" are used for descriptive purposes only and shall not be understood as suggesting or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, unless otherwise specified, "plurality" means two or more.

[0074] The embodiments of the present invention provide an information reading method and device of an LED driver and a backlight control system, which are used to read information stored in an LED driver with a variable data transmission direction in a backlight control system.

[0075] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0076] The information reading method of the LED driver provided in the embodiment of the present invention can be applied to a backlight control system, which includes a BCON and a backlight unit. The backlight unit includes a plurality of LED driving branches arranged in parallel, and each LED driving branch includes a plurality of LED drivers arranged in cascade.

[0077] Figure 1 A schematic diagram of the structure of a backlight control system is shown in FIG. Figure 1 As shown, the backlight control system includes BCON 101 and a backlight unit 102; the backlight unit 102 includes n LED driving branches arranged in parallel, namely a first LED driving branch, a second LED driving branch, ..., an nth LED driving branch, wherein n is a positive integer; each LED driving branch includes m LED drivers arranged in cascade, wherein m is a positive integer.

[0078] For example, Figure 1 The first LED driving branch in includes LED driver 11, LED driver 12, ..., LED driver 1(m-1) and LED driver 1m; Figure 1 The second LED driving branch in includes LED driver 21, LED driver 22, ..., LED driver 2(m-1) and LED driver 2m; and so on.

[0079] Therefore, the backlight unit 102 includes n×m backlight partitions, and the LED driver in each backlight partition is used to control the brightness of all LEDs in the backlight partition. Any backlight partition in the embodiment of the present invention may include one LED or multiple LEDs, for example, 2 LEDs, 4 LEDs, etc., and the embodiment of the present invention does not impose any restrictions on this.

[0080] Since the LED drivers in the above backlight control system are completely the same, the structure of the LED driver is described by taking the LED driver 21 as an example:

[0081] Figure 2 FIG. 4 shows a schematic diagram of the structure of any LED driver in the above backlight control system. Figure 2 As shown, the LED driver 21 includes three I / O (Input / Output) pins for communication, wherein the first input / output pin (PIN1) of the LED driver 21 is a bidirectional communication I / O pin, the second input / output pin (PIN2) of the LED driver 21 is also a bidirectional communication I / O pin, and the control pin of the LED driver 21 is an input pin for receiving the frame synchronization signal Vsync sent by the BCON 101.

[0082] In the specific implementation, Figure 1 In the backlight control system shown, the first LED driving branch is taken as an example: the first-level LED driver in the first LED driving branch, that is, the first input-output pin (PIN1) of the LED driver 11 is electrically connected to the first I / O terminal (1_I / O) of the BCON 101, and the BCON 101 sends the backlight control signal and the backlight control instruction to the first LED driving branch through the first I / O terminal;

[0083] The second input-output pin (PIN2) of the LED driver 11 is electrically connected to the first input-output pin (PIN1) of the second-stage LED driver in the first LED driving branch, that is, the LED driver 12;

[0084] The second input / output pin (PIN2) of the LED driver 12 is electrically connected to the third-level LED driver in the first LED driving branch, that is, the first input / output pin (PIN1) of the LED driver 13; and so on;

[0085] The second input / output pin (PIN2) of the last LED driver in the first LED driving branch, i.e., the LED driver 1m, is left floating;

[0086] The control end of each LED driver in the first LED driving branch is electrically connected to the first control end (1_Vsync) of BCON 101. BCON 101 sends a frame synchronization signal Vsync to the control end of each LED driver in the first LED driving branch through the first control end (1_Vsync). The connection method of other LED driving branches in the backlight control system is similar to the connection method of the first LED driving branch, and will not be repeated here.

[0087] It should be noted that n and m in the embodiment of the present invention are set according to actual business requirements. n and m may be equal or unequal, and the embodiment of the present invention does not impose any limitation on this.

[0088] Figure 3 FIG. 4 shows a schematic diagram of the internal structure of any LED driver in the above backlight control system. Figure 3 As shown, the LED driver 21 includes a command parsing unit 301, a data receiving and processing unit 302, a storage unit 303, a first input buffer BUF 1, a second input buffer BUF 2, a third input buffer BUF 3, a first tri-state buffer T_BUF 1, a second tri-state buffer T_BUF 2 and a resistor R1;

[0089] The first input-output pin (PIN1) is electrically connected to the input end of the first input buffer BUF 1 and the output end of the second tri-state buffer T_BUF 2, respectively; the second input-output pin (PIN2) is electrically connected to the output end of the first tri-state buffer T_BUF1, the input end of the second input buffer BUF 2 and the first end of the resistor R1, respectively; and the control pin is electrically connected to the input end of the third input buffer BUF 3;

[0090] The output end of the third input buffer BUF3 is electrically connected to the control end of the first tri-state buffer T_BUF1, the first input end of the command parsing unit 301, the first input end of the data receiving and processing unit 302, and the control end of the second tri-state buffer T_BUF2 respectively;

[0091] The output end of the first input buffer BUF 1 is electrically connected to the input end of the first tri-state buffer T_BUF 1 and the second input end of the command parsing unit 301 respectively;

[0092] The output end of the command parsing unit 301 is electrically connected to the second input end of the data receiving and processing unit 302;

[0093] The output terminal of the second input buffer BUF 2 is electrically connected to the third input terminal of the data receiving and processing unit 302;

[0094] The input / output end of the data receiving and processing unit 302 is electrically connected to the input / output end of the storage unit 303, and the output end of the data receiving and processing unit 302 is electrically connected to the input end of the second tri-state buffer T_BUF2;

[0095] A second terminal of the resistor R1 is grounded.

[0096] Optionally, the resistor R1 may be a pull-down resistor with a resistance of 10KΩ.

[0097] Optionally, the first tri-state buffer T_BUF1 is a high-level enabled buffer, and the second tri-state buffer T_BUF2 is a low-level enabled buffer.

[0098] In a specific implementation, after the control pin receives the frame synchronization signal Vsync from BCON 101, the frame synchronization signal Vsync is sent to the control end of the first three-state buffer T_BUF 1 and the control end of the second three-state buffer T_BUF 2 through the third input buffer BUF 3, and the first three-state buffer T_BUF 1 and the second three-state buffer T_BUF 2 set their own states according to the received frame synchronization signal Vsync.

[0099] Exemplarily, if the current level state of the frame synchronization signal Vsync is a high level, the first three-state buffer T_BUF 1 is controlled to be in an output state, that is, the path between the input end of the first three-state buffer T_BUF 1 and the output end of the first three-state buffer T_BUF 1 is turned on, so the second input-output pin (PIN2) is in an output state, and the second three-state buffer T_BUF 2 is controlled to be in a high-impedance state, that is, the path between the input end of the second three-state buffer T_BUF 2 and the output end of the second three-state buffer T_BUF 2 is turned off, so the first input-output pin (PIN1) is in an input state.

[0100] At this time, the data transmission path in the LED driver 21 is: the first input-output pin (PIN1) → the first input buffer BUF 1 → the first tri-state buffer T_BUF 1 → the second input-output pin (PIN2); the data transmitted through this data transmission path only needs to pass through two levels of buffers, and no data processing is required, so that the transmitted data is directly transparently transmitted, with only a ns-level delay. At the same time, the first input buffer BUF 1 will transmit the received data to the command parsing unit 301, and the command parsing unit 301 will parse the received data and send the parsing result to the data receiving and processing unit 302 for processing.

[0101] Exemplarily, if the current level state of the frame synchronization signal Vsync is a low level, the first tri-state buffer T_BUF 1 is controlled to be in a high-impedance state, that is, the path between the input end of the first tri-state buffer T_BUF 1 and the output end of the first tri-state buffer T_BUF 1 is disconnected, so the second input-output pin (PIN2) is in an input state, and the second tri-state buffer T_BUF 2 is controlled to be in an output state, that is, the path between the input end of the second tri-state buffer T_BUF 2 and the output end of the second tri-state buffer T_BUF 2 is turned on, so the first input-output pin (PIN1) is in an output state.

[0102] At this time, the data transmission path in the LED driver 21 is: the second input-output pin (PIN2) → the second input buffer BUF 2 → the data receiving and processing unit 302 → the second three-state buffer T_BUF 2 → the first input-output pin (PIN1); the data transmitted through the data transmission path is processed at the data receiving and processing unit 302 according to the received analysis result.

[0103] The storage unit 303 is used to store various relevant data in the backlight control process, such as address information, chip configuration information of the LED driver, chip status information of the LED driver, brightness information of backlight adjustment, etc.

[0104] For example Figure 1 In the backlight control system shown, since each LED driver in the backlight unit 102 is the same, in order to achieve independent control of each LED driver, first, it is necessary to determine the address of each LED driver, that is, to address each LED driver. After the addressing is completed, each LED driver in the backlight control system will store its own target address in its own storage unit 303; then, BCON 101 can achieve independent control of each LED driver in the backlight control system according to the target address, for example, specify any LED driver in the backlight control system to read information.

[0105] In an optional implementation, the target address stored in the LED driver itself can be determined in the following manner:

[0106] BCON sends a vertical synchronization signal to at least one LED driving branch, so that at least one LED driving branch turns on the first directional path or the second directional path according to the level state of the vertical synchronization signal; when the first directional path is turned on, BCON transmits the addressing instruction step by step through the first directional path, and when the second directional path is turned on, starting from the last level of LED driver, responds to the addressing instruction, generates address data signals step by step, and transmits the address data signals to BCON through the second directional path, so that each LED driver stores the address information in the address data signal generated by itself as its own target address.

[0107] In a specific implementation, BCON sends a vertical synchronization signal Vsync to a control pin of each LED driver in an LED driving branch electrically connected to the control end through a corresponding control end. Under the control of the vertical synchronization signal Vsync received by its own control pin, each LED driver in the LED driving branch turns on its own data transmission path, thereby determining the path of the LED driving branch.

[0108] In an optional implementation, if the LED driving branch determines that the level state of the vertical synchronization signal Vsync is a first level state, the first directional path is turned on; if the LED driving branch determines that the level state of the vertical synchronization signal Vsync is a second level state, the second directional path is turned on.

[0109] Optionally, the first level state is a high level state, and the second level state is a low level state.

[0110] The following embodiments are all based on Figure 4 Taking the second LED driving branch in the backlight control system shown in FIG. 1 as an example, BCON101 sends a vertical synchronization signal Vsync to the control pins of LED drivers 21 to 2m in the second LED driving branch through the second control terminal (2_Vsync):

[0111] Exemplarily, when the vertical synchronization signal Vsync is in a high level state, Figure 5 As shown, under the control of the high-level vertical synchronization signal Vsync, the LED driver 21 sets its own data transmission direction as: the first input-output pin (PIN1) → the first input buffer BUF 1 → the first tri-state buffer T_BUF 1 → the second input-output pin (PIN2), Figure 7 A schematic diagram of the state of the input and output pins of an LED driver is shown in FIG. Figure 8As shown, the first input / output pin (PIN1) of the LED driver 21 is used to input (Input) data, and the second input / output pin (PIN2) of the LED driver 21 is used to output (Output) data; similarly, the data transmission direction of the LED driver 22 is consistent with the data transmission direction of the LED driver 21, that is, the first input / output pin (PIN1) of the LED driver 22 is used to input data, and the second input / output pin (PIN2) of the LED driver 22 is used to output data; and so on. Thus, the first directional path is determined as: BCON 101→LED driver 21→LED driver 22→…→LED driver 2m.

[0112] Exemplarily, when the vertical synchronization signal Vsync is in a low level state, Figure 6 As shown, the LED driver 21 sets its own data transmission direction under the control of the low-level vertical synchronization signal Vsync: the second input-output pin (PIN2) → the second input buffer BUF 2 → the data receiving and processing unit 302 → the second tri-state buffer T_BUF 2 → the first input-output pin (PIN1), as shown in FIG. Figure 7 As shown, the second input / output pin (PIN2) of LED driver 21 is used to input (Input) data, and the first input / output pin (PIN1) of LED driver 21 is used to output (Output) data; similarly, the data transmission direction of LED driver 22 is consistent with the data transmission direction of LED driver 21, that is, the second input / output pin (PIN2) of LED driver 22 is used to input data, and the first input / output pin (PIN1) of LED driver 22 is used to output data; and so on. Thus, the second directional path is determined as: LED driver 2m→LED driver 2(m-1)→…→LED driver 21→BCON101.

[0113] In a specific implementation, when the first directional path is turned on, the data transmission direction in the backlight control system is: BCON 101→LED driver 21→LED driver 22→…→LED driver 2m. At this time, BCON 101 sends an addressing instruction to the first input / output pin (PIN1) of the LED driver 21 through the second I / O terminal (2_I / O). After receiving the addressing instruction, the LED driver 21 transmits the addressing instruction to its own second input / output pin (PIN2) through a two-stage buffer (a first input buffer BUF 1 and a first tri-state buffer T_BUF 1), and then transmits it to the first input / output pin (PIN1) of the LED driver 22. At the same time, the LED driver 21 transmits the addressing instruction to its own command parsing unit 301. The command parsing unit 301 parses the received instruction, determines that the instruction is an instruction for addressing, and transmits the parsing result to the data receiving and processing unit 302. The data receiving and processing unit 302 waits for the next step of processing. After receiving the addressing instruction, the LED driver 22 transmits it to the LED driver 23 in the same way, and then to the LED driver 2m in the same way.

[0114] In an optional embodiment, when the second directional path is turned on, the last stage LED driver in the LED driving branch generates an address data signal according to the first preset address in response to the addressing instruction;

[0115] The other LED drivers except the last stage LED driver in the LED driving branch generate address data signals in response to the addressing instruction according to the sum of the preset step value and the address information in the address data signals received by the other LED drivers.

[0116] Optionally, in the embodiment of the present invention, the first preset address may be address 0, and the preset step value may be 1.

[0117] In a specific implementation, after each LED driver in the backlight control system receives the above-mentioned addressing instruction, BCON controls the level state of the vertical synchronization signal Vsync to jump from a high level state to a low level state. At this time, the second directional path is turned on, and the data transmission direction in the backlight control system is: LED driver 2m→LED driver 2(m-1)→…→LED driver 21→BCON 101, and each LED driver enters the addressing mode. The last-level LED driver in the second LED driving branch, i.e., LED driver 2m, responds to the addressing instruction, generates an address data signal according to the first preset address through the data receiving and processing unit 302, and transmits the generated address data signal to LED driver 2(m-1) through its own first input and output pin (PIN1). At the same time, LED driver 2m determines its own target address according to the address data signal generated by itself, and stores the determined target address in the storage unit 303.

[0118] The non-last-stage LED driver in the second LED driving branch, i.e., LED driver (21, ..., 2(m-1)), receives the address data signal through the second directional path, wherein LED driver 2(m-1) receives the address data signal sent by LED driver 2m, LED driver 2(m-1) recognizes that the address information carried in the address data signal is address 0 through the data receiving and processing unit 302, and then responds to the addressing instruction, takes the sum of address 0 and the preset step value as the new address, and generates an address data signal according to the new address, LED driver 2(m-1) transmits the address data signal generated by itself to LED driver 2(m-2) through its own first input and output pin (PIN1), and at the same time, LED driver 2(m-1) determines its own target address according to the address data signal generated by itself, and stores the determined target address in the storage unit 303. After receiving the address data signal sent by LED driver 2(m-1), LED driver 2(m-2) performs the same operation as LED driver 2(m-1); and so on, until LED driver 21 transmits the address data signal generated by itself to BCON 101.

[0119] Exemplarily, the LED driver 2m generates an address data signal carrying address 0 through the data receiving and processing unit 302, and transmits the address data signal to the second input and output pin (PIN2) of the LED driver 2(m-1) through the first input and output pin (PIN1) of the LED driver 2m. At the same time, the LED driver 2m uses address 0 as its own target address through the data receiving and processing unit 302, and transmits the target address 0 to the storage unit 303 for storage.

[0120] Exemplarily, after receiving the address data signal carrying address 0 sent by LED driver 2m, LED driver 2(m-1) identifies the address information in the received address data signal as address 0 through data receiving and processing unit 302, and adds 1 to address 0 to obtain address 1, then generates an address data signal carrying address 1, and transmits the newly generated address data signal to the second input and output pin (PIN2) of LED driver 2(m-2) through the first input and output pin (PIN1) of LED driver 2(m-1). At the same time, LED driver 2(m-1) uses address 1 as its own target address through data receiving and processing unit 302, and transmits target address 1 to storage unit 303 for storage. Other LED drivers repeat the above operations step by step, so that in the second LED driving branch: LED driver 2m confirms that its own target address is 0, LED driver 2(m-1) confirms that its own target address is 1, LED driver 22 determines that its own target address is m-2, ..., LED driver 21 determines that its own target address is m-1.

[0121] In the above method, BCON transmits the addressing instruction to each LED driver step by step through the first directional path that is turned on, and after the second directional path is turned on, the last-level LED driver of each LED driving branch is turned on to respond to the addressing instruction, and the address data signal is generated step by step. Each LED driver determines its own target address according to the address data signal generated by itself, until the address data signal is transmitted to BCON through the second directional path, thereby realizing the determination of the target address of each LED driver in the backlight control system.

[0122] In the above backlight control system, after completing the addressing operation of the LED driver, Figure 8 As shown, each LED driver's storage unit 303 stores its own target address. Figure 8 It can be seen that the target address stored in LED driver 21 itself is m-1, the target address stored in LED driver 22 itself is m-2, the target address stored in LED driver 23 itself is m-3, ..., and the target address stored in LED driver 2m itself is 0. BCON 101 can perform data reading operations on any specific LED driver in the backlight control system.

[0123] like Fig. 9 As shown in FIG. 1 , it is a flowchart of an information reading method of an LED driver provided by an embodiment of the present invention. The method is based on Figure 1 The backlight control system shown in the figure, the specific steps of the method are as follows:

[0124] Step S901, BCON sends a vertical synchronization signal Vsync to at least one LED driving branch, so that at least one LED driving branch turns on a first directional path or a second directional path according to the level state of the vertical synchronization signal Vsync, wherein the first directional path and the second directional path are two paths in opposite directions in the LED driving branch;

[0125] In an optional embodiment, if the LED driving branch determines that the level state of the vertical synchronization signal Vsync is a first level state, the first directional path is turned on; if the LED driving branch determines that the level state of the vertical synchronization signal Vsync is a second level state, the second directional path is turned on, wherein the first level state and the second level state are different.

[0126] Optionally, the first level state is a high level state, and the second level state is a low level state.

[0127] In the embodiment of the present invention, the specific implementation process of step S901 is similar to the above-mentioned addressing process. Therefore, the implementation of step S901 can refer to the implementation of the above-mentioned addressing process, and the repeated parts will not be repeated.

[0128] In the above method, when the vertical synchronization signal is in the first level state, the first input and output pins of each LED driver in the LED driving branch are controlled to be input pins, and the second input and output pins of each LED driver are controlled to be output pins, so as to realize the conduction of the first directional path, that is, the first directional path is the path from BCON to the last LED driver in the LED driving branch; when the vertical synchronization signal is in the second level state, the second input and output pins of each LED driver in the LED driving branch are controlled to be input pins, and the first input and output pins of each LED driver are controlled to be output pins, so as to realize the conduction of the second directional path, that is, the second directional path is the path from the last LED driver in the LED driving branch to BCON. Through the above vertical synchronization signal, the data transmission direction of each LED driver is variable, thereby realizing the conduction of the first directional path or the conduction of the second directional path.

[0129] Step S902, when the first directional path is turned on, BCON transmits the information reading instruction and the address information corresponding to the information reading instruction step by step through the first directional path, so that at least one LED driving branch determines whether it is the target LED driver according to the received address information, and when the second directional path is turned on, when it determines that it is the target LED driver, it responds to the information reading instruction, reads its own data information, and transmits the read data information to BCON step by step through the second directional path.

[0130] In a specific implementation, when the first directional path is turned on, the data transmission direction in the backlight control system is: BCON 101→LED driver 21→LED driver 22→…→LED driver 2m. At this time, BCON 101 sends an information reading instruction and address information corresponding to the information reading instruction to the first input-output pin (PIN1) of the LED driver 21 through the second I / O terminal (2_I / O). After receiving the information reading instruction and the address information corresponding to the information reading instruction, the LED driver 21 transmits the information reading instruction and the address information corresponding to the information reading instruction to its own second input-output pin (PIN2) through a two-stage buffer (a first input buffer BUF 1 and a first tri-state buffer T_BUF 1), and then transmits them to the first input-output pin (PIN1) of the LED driver 22.

[0131] At the same time, the LED driver 21 transmits the information reading instruction and the address information corresponding to the information reading instruction to its own command parsing unit 301. The command parsing unit 301 parses the received information reading instruction, determines that the instruction is an instruction for reading information, and transmits the parsing result and the address information corresponding to the information reading instruction to the data receiving and processing unit 302. The data receiving and processing unit 302 waits for the next step of processing. After receiving the information reading instruction and the address information corresponding to the information reading instruction, the LED driver 22 transmits it to the LED driver 23 in the same way, and then to the LED driver 2m in the same way. At this time, the transmission of the information reading instruction and the address information corresponding to the information reading instruction is completed.

[0132] Fig.10 FIG. 1 shows a schematic diagram of signal waveforms of each LED driver in any LED driving branch in a backlight control system. When the vertical synchronization signal Vsync is in a high level state, the first directional path is turned on, and BCON transmits information reading instructions and address information corresponding to the information reading instructions to the last-level LED driver step by step through the first directional path. Fig.10 As shown, BCON sends the information read instruction and address information m-3 to the LED driver 21 through 2_I / O, and then the LED driver 21 transmits the information read instruction and address information m-3 to the LED driver 22 through the second input and output pin (PIN2), and then the LED driver 22 transmits the information read instruction and address information m-3 to the LED driver 23 through the second input and output pin (PIN2), and transmits it step by step until it is transmitted to the LED driver 2m.

[0133] In the above method, since the information reading instruction and the address information corresponding to the information reading instruction are transmitted in each LED driver, no data processing is performed until they pass through the two-stage buffer (the first input buffer BUF 1 and the first three-state buffer T_BUF1), therefore, the transmission delay of the addressing instruction in each LED driver is at the ns (nanosecond) level, and the transmission delay is very short, so that the transmission delay of the information reading instruction and the address information corresponding to the information reading instruction from the first-stage LED driver of the LED driving branch to the last-stage LED driver is also very short, thereby accelerating the transmission efficiency.

[0134] In an optional implementation, for any LED driving branch, each LED driver in the LED driving branch compares the target address stored in itself with the received address information. If the address information is equal to the target address stored in the LED driver itself, the LED driver is determined to be the target LED driver; if the address information is not equal to the target address stored in the LED driver itself, the LED driver is determined to be a non-target LED driver.

[0135] In an optional implementation, for a non-target LED driver, if the address information is greater than the target address stored in the LED driver itself, the designated input and output pins of the LED driver are set to a preset level; if the address information is not greater than the target address stored in the LED driver itself, the LED driver is not processed.

[0136] Optionally, in the embodiment of the present invention, the designated input / output pin is the first input / output pin (PIN1), and the preset level is a high level.

[0137] In a specific implementation, after each LED driver in the backlight control system receives the information reading instruction and the address information corresponding to the information reading instruction, the command parsing unit 301 parses the information reading instruction to confirm that the instruction is an instruction to control the LED driver to read the information stored in itself. At the same time, the command parsing unit 301 compares the received address information corresponding to the information reading instruction with the target address stored in itself:

[0138] If it is recognized that the received address information is equal to the target address stored in itself, it is determined that it is the target LED driver and controls itself to enter the reading mode; if it is recognized that the received address information is greater than the target address stored in itself, it is determined that it is a non-target LED driver and sets its first input and output pin (PIN1) to a high level to control itself to enter the idle mode; if it is recognized that the received address information is less than the target address stored in itself, it is determined that it is a non-target LED driver and controls itself to enter the transmission mode, waiting for the arrival of the read information.

[0139] Exemplarily, assuming that BCON sends an information read instruction and address information m-3 through 2_I / O, after the LED driver (21, ..., 2m) receives the information read instruction and address information m-3, it compares the target address stored in itself with the address information m-3. Specifically, the target address stored in the LED driver 21 itself is m-1. Since the address information m-3 is less than the target address m-1, the LED driver 21 confirms that it is not the target LED driver, and controls itself to enter the transmission mode, waiting for information transmission;

[0140] Similarly, LED driver 22 also confirms that it is not the target LED driver, and controls itself to enter the transmission mode, waiting for information transmission. The target address stored in LED driver 23 itself is m-3. Since the target address is equal to the address information m-3, LED driver 23 confirms that it is the target LED driver, and controls itself to enter the read mode, waiting for the response information read instruction. The target address stored in LED driver 24 itself is m-4. Since the address information m-3 is greater than the target address m-4, LED driver 24 confirms that it is not the target LED driver, and controls itself to enter the idle mode; similarly, LED drivers (25, ..., 2m) all confirm that they are not the target LED drivers, and control themselves to enter the idle mode.

[0141] In the above method, after each LED driver in the backlight control system receives the information reading instruction and the address information corresponding to the information reading instruction, it compares the target address stored in itself with the received address information. If the LED driver determines that the received address information is equal to the target address stored in itself, the LED driver determines that it is the target LED driver; if the LED driver determines that the received address information is not equal to the target address stored in itself, the LED driver determines that it is not the target LED driver. And for non-target LED drivers, the designated input and output pins of the LED drivers whose received address information is greater than the target address stored in itself are set to a preset level to ensure that the LED driver is in an idle state and that the information reading is carried out normally.

[0142] Optionally, in the embodiment of the present invention, the data information read by the target LED driver itself may be data information stored in a storage unit of the target LED driver, for example, chip status information of the LED driver, brightness information of backlight adjustment, etc.

[0143] In a specific implementation, after each LED driver in the backlight control system receives the above-mentioned information reading instruction and the address information corresponding to the information reading instruction, BCON controls the level state of the vertical synchronization signal Vsync to jump from a high level state to a low level state. At this time, the second directional path is turned on, and the data transmission direction in the backlight control system is: LED driver 2m→LED driver 2(m-1)→…→LED driver 21→BCON 101. At this time, the LED driver in the idle state controls the level state of its own first input and output pin (PIN1) to a high level; the LED driver in the reading mode, that is, the target LED driver responds to the information reading instruction, reads its own data information, and transmits the read data information to BCON 101 step by step through the second directional path.

[0144] Exemplarily, it is assumed that the LED drivers (21, ..., 2m) all receive the information reading instruction and the address information m-3, and the LED driver 21 and the LED driver 22 all control themselves to enter the transmission mode, the LED driver 23 controls itself to enter the reading mode, and the LED driver (24, ..., 2m) all control themselves to enter the idle mode, and then the BCON 101 controls the vertical synchronization signal Vsync to jump to a low level state. At this time, the level state of the first input and output pin (PIN1) of the LED driver (24, ..., 2m) is a high level, and the LED driver (24, ..., 2m) does not take any action; the LED driver 23 responds to the information reading instruction, reads the data information stored in its own storage unit 303, and transmits the data information to the second input and output pin (PIN2) of the LED driver 22 through the first input and output pin (PIN1) of the LED driver 23. After receiving the data information, the LED driver 22 does not process the data information, and only transmits the data information to the second input and output pin (PIN2) of the LED driver 21 through its own first input and output pin (PIN1).

[0145] Similarly, after receiving the data information, the LED driver 21 does not process the data information, but only transmits the data information to the second I / O terminal (2_I / O) of the BCON 101 through its own first input / output pin (PIN1), thereby completing the information reading operation of the LED driver with the target address m-3.

[0146] like Fig.10As shown, when the vertical synchronization signal Vsync becomes a low level state, the second directional path is turned on, the LED drivers 24 to 2m are all in an idle state, and the LED driver 23 reads the data information stored in itself, and transmits the data information to the BCON 101 along the path of LED driver 22→LED driver 21→BCON 101. Specifically, the second input and output pin (PIN2) of the LED driver 22 receives the data information generated and sent by the LED driver 23, the second input and output pin (PIN2) of the LED driver 21 receives the data information sent by the LED driver 22, and the second I / O terminal (2_I / O) of the BCON 101 receives the data information sent by the LED driver 21.

[0147] In the information reading method of the LED driver provided by the embodiment of the present invention, under the control of the vertical synchronization signal sent by BCON, each LED driver in each LED driving branch determines its own data transmission direction, thereby turning on the first directional path or the second directional path, and BCON transmits the information reading instruction and the address information corresponding to the information reading instruction to each LED driver step by step through the turned-on first directional path, and each LED driver detects whether it is the target LED driver based on the received address information, and when the second directional path is turned on, the LED driver that determines itself as the target LED driver responds to the information reading instruction, reads its own data information, and transmits the read data information to BCON through the second directional path, thereby realizing the reading of the information stored in the LED driver with variable data transmission direction in the backlight control system.

[0148] Based on the same concept, an embodiment of the present invention further provides an information reading device of an LED driver, which is applied to a backlight control system. The backlight control system includes a BCON and a backlight unit. The backlight unit includes a plurality of LED driving branches arranged in parallel. Each LED driving branch includes a plurality of LED drivers arranged in cascade. Since the device is the device in the method in the embodiment of the present invention, and the principle of solving the problem by the device is similar to that of the method, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0149] like Fig.11 As shown, the above device includes the following modules:

[0150] The signal sending module 1101 is used to send a vertical synchronization signal to at least one LED driving branch, so that the at least one LED driving branch conducts a first directional path or a second directional path according to the level state of the vertical synchronization signal, wherein the first directional path and the second directional path are two paths in opposite directions in the LED driving branch;

[0151] The information reading module 1102 is used for, when the first directional path is turned on, BCON transmits the information reading instruction and the address information corresponding to the information reading instruction step by step through the first directional path, so that at least one LED driving branch determines whether it is the target LED driver according to the received address information, and when the second directional path is turned on, when it determines that it is the target LED driver, it responds to the information reading instruction, reads its own data information, and transmits the read data information to BCON step by step through the second directional path.

[0152] In an optional implementation, the information reading module 1102 is specifically used for:

[0153] For any LED driving branch, each LED driver in the LED driving branch compares the target address stored in itself with the received address information;

[0154] If the address information is equal to the target address stored in the LED driver itself, the LED driver is determined to be the target LED driver;

[0155] If the address information is not equal to the target address stored in the LED driver itself, it is determined that the LED driver is a non-target LED driver.

[0156] In an optional implementation, the above device further includes an addressing module, and the addressing module determines the target address stored in the LED driver itself in the following manner:

[0157] BCON sends a vertical synchronization signal to at least one LED driving branch, so that at least one LED driving branch conducts the first directional path or the second directional path according to the level state of the vertical synchronization signal;

[0158] When the first directional path is turned on, BCON transmits the addressing instruction step by step through the first directional path. When the second directional path is turned on, starting from the last level of LED driver, it responds to the addressing instruction, generates address data signals step by step, and transmits the address data signals to BCON through the second directional path, so that each LED driver stores the address information in the address data signal generated by itself as its own target address.

[0159] In an optional implementation, the addressing module is specifically used for:

[0160] When the second directional path is turned on, the last LED driver in the LED driving branch generates an address data signal according to the first preset address in response to the addressing instruction;

[0161] The non-last-stage LED driver in the LED driving branch generates an address data signal in response to the addressing instruction according to the sum of the preset step value and the address information in the address data signal received by the non-last-stage LED driver.

[0162] In an optional implementation, the above device further includes a pin setting module;

[0163] The pin setting module is used for comparing the target address stored in itself with the received address information for each LED driver in any LED driver branch;

[0164] If the address information is greater than the target address stored in the LED driver itself, the designated input and output pins of the LED driver are set to a preset level;

[0165] If the address information is not greater than the target address stored in the LED driver itself, the LED driver will not be processed.

[0166] In an optional implementation manner, the signal sending module 1101 is specifically configured to:

[0167] If the LED driving branch determines that the level state of the vertical synchronization signal is a first level state, then the first directional path is turned on;

[0168] If the LED driving branch determines that the level state of the vertical synchronization signal is the second level state, then the second directional path is turned on;

[0169] The first level state and the second level state are different.

[0170] Based on the same concept, an embodiment of the present invention further provides an electronic device. Since the electronic device is the electronic device in the method in the embodiment of the present invention, and the principle of solving the problem by the electronic device is similar to that of the method, the implementation of the electronic device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0171] Refer to the following Fig.12 The electronic device 120 according to this embodiment of the present invention will be described. Fig.12 The electronic device 120 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0172] like Fig.12 As shown, the components of the electronic device 120 may include but are not limited to: the at least one processor 121 mentioned above, and the at least one memory 122 storing instructions executable by the processor 121. The processor 121 is a processor of a smart device.

[0173] The processor 121 executes the executable instructions to implement the following steps:

[0174] A vertical synchronization signal is sent to at least one LED driving branch, so that at least one LED driving branch turns on a first directional path or a second directional path according to the level state of the vertical synchronization signal, wherein the first directional path and the second directional path are two paths in the LED driving branch that are opposite to each other; when the first directional path is turned on, BCON transmits an information reading instruction and address information corresponding to the information reading instruction step by step through the first directional path, so that at least one LED driving branch determines whether it is a target LED driver according to the received address information, and when the second directional path is turned on, when it is determined that it is a target LED driver, it responds to the information reading instruction, reads its own data information, and transmits the read data information to BCON step by step through the second directional path.

[0175] In an optional implementation manner, the processor 121 is specifically configured to:

[0176] For each LED driving branch, each LED driver in the LED driving branch compares the target address stored in itself with the received address information;

[0177] If the address information is equal to the target address stored in the LED driver itself, the LED driver is determined to be the target LED driver;

[0178] If the address information is not equal to the target address stored in the LED driver itself, it is determined that the LED driver is a non-target LED driver.

[0179] In an optional implementation, the processor 121 determines the target address stored in the LED driver itself in the following manner:

[0180] BCON sends a vertical synchronization signal to at least one LED driving branch, so that at least one LED driving branch conducts the first directional path or the second directional path according to the level state of the vertical synchronization signal;

[0181] When the first directional path is turned on, BCON transmits the addressing instruction step by step through the first directional path. When the second directional path is turned on, starting from the last level of LED driver, it responds to the addressing instruction, generates address data signals step by step, and transmits the address data signals to BCON through the second directional path, so that each LED driver stores the address information in the address data signal generated by itself as its own target address.

[0182] In an optional implementation manner, the processor 121 is specifically configured to:

[0183] When the second directional path is turned on, the last LED driver in the LED driving branch generates an address data signal according to the first preset address in response to the addressing instruction;

[0184] The non-last-stage LED driver in the LED driving branch generates an address data signal in response to the addressing instruction according to the sum of the preset step value and the address information in the address data signal received by the non-last-stage LED driver.

[0185] In an optional implementation, the processor 121 is further configured to:

[0186] For any LED driving branch, each LED driver in the LED driving branch compares the target address stored in itself with the received address information;

[0187] If the address information is greater than the target address stored in the LED driver itself, the designated input and output pins of the LED driver are set to a preset level;

[0188] If the address information is not greater than the target address stored in the LED driver itself, the LED driver will not be processed.

[0189] In an optional implementation manner, the processor 121 is specifically configured to:

[0190] If the LED driving branch determines that the level state of the vertical synchronization signal is a first level state, then the first directional path is turned on;

[0191] If the LED driving branch determines that the level state of the vertical synchronization signal is the second level state, then the second directional path is turned on;

[0192] The first level state and the second level state are different.

[0193] Based on the same concept, the embodiment of the present invention also provides a backlight control system, such as Fig.13 As shown, the backlight control system 130 includes a BCON 131 and a backlight unit 132, the backlight unit 132 includes a plurality of LED driving branches arranged in parallel, and each LED driving branch includes a plurality of LED drivers arranged in cascade; since the backlight control system is the backlight control system in the method in the embodiment of the present invention, and the principle of solving the problem by the backlight control system is similar to that of the method, the implementation of the backlight control system can refer to the implementation of the method, and the repeated parts will not be repeated.

[0194] In some possible implementations, various aspects of the present invention may also be implemented in the form of a program product, which includes a program code. When the program product is run on a terminal device, the program code is used to enable the terminal device to execute the steps of each module in the information publishing device according to various exemplary implementations of the present disclosure described in the above "Exemplary Method" section of this specification, for example, sending a vertical synchronization signal to at least one LED driving branch, so that at least one LED driving branch turns on a first directional path or a second directional path according to the level state of the vertical synchronization signal, wherein the first directional path and the second directional path are two paths in the LED driving branch that are opposite to each other; when the first directional path is turned on, BCON transmits an information reading instruction and address information corresponding to the information reading instruction step by step through the first directional path, so that at least one LED driving branch determines whether it is a target LED driver according to the received address information, and when the second directional path is turned on, when it is determined that it is a target LED driver, it responds to the information reading instruction to read its own data information, and transmits the read data information to BCON step by step through the second directional path.

[0195] like Fig.14 As shown, a program product 140 of an information reading method of an LED driver according to an embodiment of the present invention is described, which can adopt a portable compact disk read-only memory (CD-ROM) and include program code, and can be run on a terminal device, such as a personal computer. However, the program product of the present invention is not limited thereto, and in this document, a readable storage medium can be any tangible medium containing or storing a program, which can be used by or in combination with an instruction execution system, an apparatus or a device.

[0196] The present application is described above with reference to the block diagrams and / or flow charts showing the methods, devices (systems) and / or computer program products according to the embodiments of the present application. It should be understood that a block of the block diagram and / or flow chart diagram and a combination of blocks of the block diagram and / or flow chart 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 and / or other programmable data processing device to produce a machine, so that the instructions executed by the computer processor and / or other programmable data processing device create a method for implementing the functions / actions specified in the block diagram and / or flow chart block.

[0197] Accordingly, the present application may also be implemented with hardware and / or software (including firmware, resident software, microcode, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium, which has a computer-usable or computer-readable program code implemented in the medium, for use by an instruction execution system or in conjunction with an instruction execution system. In the context of the present application, a computer-usable or computer-readable medium may be any medium that may contain, store, communicate, transmit, or convey a program for use by an instruction execution system, device, or apparatus, or in conjunction with an instruction execution system, device, or apparatus.

[0198] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for reading information of a light emitting diode (LED) driver, characterized in that: Applied to a backlight control system, the backlight control system comprises a backlight drive controller BCON and a backlight unit, the backlight unit comprises a plurality of LED drive branches arranged in parallel, each LED drive branch comprises a plurality of LED drivers arranged in cascade; The BCON sends a vertical synchronization signal to at least one LED driving branch, so that the at least one LED driving branch conducts a first directional path or a second directional path according to the level state of the vertical synchronization signal, wherein the first directional path and the second directional path are two paths in the LED driving branch that are opposite to each other; When the first directional path is turned on, the BCON transmits the information reading instruction and the address information corresponding to the information reading instruction step by step through the first directional path, so that at least one LED driving branch determines whether it is the target LED driver according to the received address information. When the second directional path is turned on, when it determines that it is the target LED driver, it responds to the information reading instruction, reads its own data information, and transmits the read data information to the BCON step by step through the second directional path.

2. The method according to claim 1, characterized in that The at least one LED driving branch determines whether it is a target LED driver according to the received address information, including: For any LED driving branch, each LED driver in the LED driving branch compares the target address stored in itself with the received address information; If the address information is equal to the target address stored in the LED driver itself, then the LED driver is determined to be the target LED driver; If the address information is not equal to the target address stored in the LED driver itself, it is determined that the LED driver is a non-target LED driver.

3. The method according to claim 2, characterized in that The target address stored in the LED driver itself is determined in the following way: The BCON sends a vertical synchronization signal to at least one LED driving branch, so that the at least one LED driving branch conducts the first directional path or the second directional path according to the level state of the vertical synchronization signal; When the first directional path is turned on, the BCON transmits the addressing instruction step by step through the first directional path. When the second directional path is turned on, starting from the last level of LED driver, it responds to the addressing instruction, generates address data signals step by step, and transmits the address data signals to the BCON through the second directional path, so that each LED driver stores the address information in the address data signal generated by itself as its own target address.

4. The method according to claim 3, characterized in that When the second directional path is turned on, starting from the last LED driver, in response to the addressing instruction, the address data signal is generated step by step, including: When the second directional path is turned on, the last LED driver in the LED driving branch generates the address data signal according to the first preset address in response to the addressing instruction; The non-last-stage LED driver in the LED driving branch generates the address data signal in response to the addressing instruction according to the sum of a preset step value and address information in the address data signal received by the non-last-stage LED driver.

5. The method according to claim 2, characterized in that The method further comprises: For any LED driving branch, each LED driver in the LED driving branch compares the target address stored in itself with the received address information; If the address information is greater than the target address stored in the LED driver itself, the designated input and output pins of the LED driver are set to a preset level; If the address information is not greater than the target address stored in the LED driver itself, the LED driver will not be processed.

6. The method according to claim 1 or 3, characterized in that: The at least one LED driving branch conducts the first directional path or the second directional path according to the level state of the vertical synchronization signal, including: If the LED driving branch determines that the level state of the vertical synchronization signal is a first level state, then the first directional path is turned on; If the LED driving branch determines that the level state of the vertical synchronization signal is the second level state, then the second directional path is turned on; The first level state and the second level state are different.

7. An information reading device for a light emitting diode (LED) driver, characterized in that: Applied to a backlight control system, the backlight control system includes a backlight drive controller BCON and a backlight unit, the backlight unit includes a plurality of LED drive branches arranged in parallel, each LED drive branch includes a plurality of LED drivers arranged in cascade, the device includes: A signal sending module, used for sending a vertical synchronization signal to at least one LED driving branch, so that at least one LED driving branch conducts a first directional path or a second directional path according to the level state of the vertical synchronization signal, wherein the first directional path and the second directional path are two paths in the LED driving branch that are opposite to each other; The information reading module is used for, when the first directional path is turned on, the BCON transmits the information reading instruction and the address information corresponding to the information reading instruction step by step through the first directional path, so that at least one LED driving branch determines whether it is the target LED driver according to the received address information, and when the second directional path is turned on, when it determines that it is the target LED driver, responds to the information reading instruction, reads its own data information, and transmits the read data information to the BCON step by step through the second directional path.

8. An electronic device, characterized in that: include: A memory for storing executable instructions; A processor is used to read and execute the executable instructions stored in the memory to implement the steps of the information reading method of the light emitting diode (LED) driver according to any one of claims 1 to 6.

9. A backlight control system, characterized in that: It includes a backlight driving controller BCON and a backlight unit, wherein the backlight unit includes a plurality of LED driving branches arranged in parallel, and each LED driving branch includes a plurality of LED drivers arranged in cascade; The backlight control system is used to execute the steps of the information reading method of the light emitting diode (LED) driver according to any one of claims 1 to 6.

10. A computer-readable storage medium, characterized in that: When the instructions in the storage medium are executed by a processor, the processor is enabled to execute the steps of the information reading method of the light emitting diode (LED) driver according to any one of claims 1 to 6.

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