LED drive circuit and LED drive system

Abstract

The embodiment of the present invention provides an LED driving circuit and an LED driving system. The LED driving circuit includes n LED driving chips, where n≥2; one end of each LED driving chip is electrically connected to the positive pole of a common power line; the other end of each LED driving chip is electrically connected to the negative pole of the common power line; wherein the positive pole and the negative pole of the common power line are respectively connected to a controller, and the controller is used to transmit data to each LED driving chip at the positive pole of the common power line in the form of an initial carrier signal. The complexity of the LED driving circuit is reduced and the stability of data transmission is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of LED (Light Emitting Diode), and in particular to an LED driving circuit and an LED driving system. Background Art

[0002] With the rapid development of LEDs, more and more types of LED drive circuits have begun to appear.

[0003] At present, a commonly used LED driving circuit is to connect multiple LED driving chips in series to obtain a cascade LED driving circuit, so that data is sent to the next LED driving chip through the previous LED driving chip.

[0004] However, currently commonly used LED driving circuits connect multiple LEDs in series in a cascade manner to transmit data, which is too complex and easily causes unstable data transmission. Summary of the invention

[0005] The embodiments of the present invention provide an LED driving circuit and an LED driving system to reduce the complexity of the LED driving circuit and improve the stability of data transmission.

[0006] In a first aspect, an embodiment of the present invention provides an LED driving circuit, wherein the LED driving circuit includes n LED driving chips, where n≥2;

[0007] One end of each of the LED driver chips is electrically connected to the positive electrode of the common power line;

[0008] The other end of each LED driver chip is electrically connected to the negative electrode of the common power line;

[0009] The positive electrode and the negative electrode of the common power line are respectively connected to the controller, and the controller is used to transmit data in the form of an initial carrier signal at the positive electrode of the common power line to each of the LED driver chips.

[0010] Optionally, the data includes configuration data and / or display data;

[0011] The configuration data is used to configure the working state of the LED driver chip;

[0012] The display data is used to drive the LED driver chip to control the LED lamp to display.

[0013] Optionally, each of the LED driver chips is pre-configured with an address, and the LED driver chip includes:

[0014] A decoding module, the decoding module is used to receive the data from the positive electrode of the common power line and decode the data;

[0015] An address code fetching module, the address code fetching module is used to receive the decoded data, and extract the target data corresponding to the LED driver chip at this level from the decoded data according to the current address corresponding to the LED driver chip at this level;

[0016] The display output module is used to receive the target display data sent by the address code acquisition module when the data is display data, so as to control the LED light to display according to the target display data.

[0017] Optionally, the LED driver chip further includes:

[0018] A filtering module, which is arranged before the decoding module and is used to filter the initial carrier signal;

[0019] The decoding module decodes the data according to the initial carrier signal and the filtered carrier signal.

[0020] Optionally, the decoding module is specifically used to decode and obtain a first digital code when the voltage of the initial carrier signal is higher than the voltage of the filtered carrier signal;

[0021] When the voltage of the initial carrier signal is lower than the voltage of the filtered carrier signal, the second digital code is obtained by decoding.

[0022] Optionally, adjacent initial carrier signals are spaced apart by a level interval of a preset length.

[0023] Optionally, the n LED driver chips are electrically connected in series, and the first-stage LED driver chip is electrically connected to the controller;

[0024] The LED driving circuit receives the address and configuration data sent by the controller during initialization.

[0025] Optionally, the LED driver chip further includes:

[0026] A bit rate detection module, used for detecting a bit rate parameter corresponding to the display data when the data is display data;

[0027] A data buffer module, used for caching the display data;

[0028] The decoding module is specifically used to receive the bit rate parameter sent by the bit rate detection module, and extract the display data from the data buffer module to decode the target data according to the bit rate parameter.

[0029] Optionally, there are multiple decoding modules;

[0030] The plurality of decoding modules sequentially receive the data sent by the controller at preset time intervals.

[0031] In a second aspect, an embodiment of the present invention provides an LED driving system, comprising the LED driving circuit described in any embodiment of the present invention, and further comprising a controller, wherein the controller is connected to one end of each of the LED driver chips through the positive pole of a common power line, and the controller is connected to the other end of each of the LED driver chips through the positive pole of the common power line, and the controller is used to transmit data to each of the LED driver chips in the form of an initial carrier signal at the positive pole of the common power line.

[0032] The LED driving circuit of the embodiment of the present invention comprises n LED driving chips, wherein n≥2; one end of each of the LED driving chips is electrically connected to the positive pole of a common power line; the other end of each of the LED driving chips is electrically connected to the negative pole of the common power line; wherein the positive pole and the negative pole of the common power line are respectively connected to a controller, and the controller is used to transmit data in the form of an initial carrier signal at the positive pole of the common power line to each of the LED driving chips, thereby solving the problem that the currently commonly used LED driving circuit transmits data in series by cascading multiple LEDs, which is too complex and easily causes unstable data transmission, and thus reduces the complexity of the LED driving circuit and improves the stability of data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of the structure of an LED driving circuit provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the structure of another LED driving circuit provided by an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of the structure of an LED driver chip provided by an embodiment of the present invention;

[0036] Figure 4 A schematic diagram of the structure of another LED driver chip provided by an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of the structure of another LED driver chip provided by an embodiment of the present invention;

[0038] Figure 6 A schematic structural diagram of an LED driving system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0040] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0041] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Figure 1 FIG. 1 is a schematic diagram of a structure of an LED driving circuit provided by an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides an LED driving circuit 100, comprising n LED driving chips 110, wherein n≥2, wherein:

[0043] One end of each LED driver chip 110 is electrically connected to the positive electrode 210 of the common power line;

[0044] The other end of each LED driver chip 110 is electrically connected to the negative electrode 220 of the common power line;

[0045] The positive electrode 210 and the negative electrode of the common power line are respectively connected to the controller 300 , and the controller 300 is used to transmit data to each of the LED driver chips 110 in the form of an initial carrier signal at the positive electrode 210 of the common power line.

[0046] In this embodiment, data is transmitted to each LED driver chip 110 at the positive pole 210 of the common power line in the form of an initial carrier signal, and each LED driver chip 110 can control the LED light to display or configure the working state of the LED driver chip 110 according to the received data. It can be understood that by transmitting data to each LED driver chip 110 at the positive pole 210 of the common power line in the form of an initial carrier signal, the complexity is lower, and even if one of the LED driver chips 110 is damaged, it will not affect the transmission of other LED driver chips 110, thereby improving the stability of data transmission.

[0047] For example, when the LED driving circuit 100 is transmitting display data to display a picture, when one of the LED driving chips 110 is damaged, only this LED driving chip 110 cannot drive the LED lamp for display, and other LED driving chips 110 can drive the LED lamp for display normally. The only manifestation of the fault is that the LED lamp driven by the damaged LED driving chip 110 does not light up, and the bad point can also be quickly located.

[0048] It should be noted that the data of this embodiment may be configuration data and / or display data, that is, the data may be only display data or configuration data, or the display data and configuration data may be sent together. The configuration data is used to configure the working state of the LED driver chip 110. Optionally, the configuration data may be used to configure one or more of the gamma coefficient, current adjustment, and grayscale accuracy. The display data is used to drive the LED driver chip 110 to control the LED lamp for display. The n LED driver chips in the LED driver circuit 100 of this embodiment are not cascaded.

[0049] In this embodiment, each LED driver chip 110 in the LED driver circuit 100 is pre-configured with an address. It is understandable that the pre-configured address may be a fixed address initialized before leaving the factory, so there is no need to cascade between the LED driver chips 110; in addition, the pre-configured address may not be initialized before leaving the factory, so the LED driver chips 110 need to be cascaded to initialize the address.

[0050] refer to Figure 2 , Figure 2 is a schematic diagram of the structure of another LED driving circuit provided by this embodiment. Figure 2 It can be seen that n LED driver chips 110 are electrically connected in series, and the first-level LED driver chip 110 is electrically connected to the controller 300; the LED driver circuit 100 receives the address and configuration data sent by the controller 300 during initialization.

[0051] It should be noted that the LED driving circuit 100 in this embodiment, the n LED driving chips 110 are cascaded only for sending the address and configuration data through the controller 300 during initialization, and the subsequent transmission of display data and / or configuration data is transmitted through the positive electrode 210 of the common power line. If n LED driving chips 110 need to be cascaded, they can be transmitted to the next level LED driving chip 110 through the decoding module 111 of the current level LED driving chip 110.

[0052] refer to Figure 3 , Figure 3 Schematic diagram of the structure of an LED driver chip provided in this embodiment. Figure 3 It can be seen that the LED driver chip 110 includes a decoding module 111, an address code acquisition module 112 and a display output module 113. Each LED driver chip 110 is pre-configured with an address, wherein:

[0053] The decoding module 111 is used to receive the data from the positive electrode 210 of the common power line and decode the data;

[0054] The address code acquisition module 112 is used to receive the decoded data, and extract the target data corresponding to the LED driver chip 110 of the current stage from the decoded data according to the current address corresponding to the LED driver chip 110 of the current stage;

[0055] The display output module 113 is used to receive the target display data sent by the address code acquisition module 112 when the data is display data, so as to control the LED light to display according to the target display data.

[0056] Specifically, the decoding module 111 is electrically connected to the positive electrode 210 of the common power line, receives data from the positive electrode 210 of the common power line for decoding, and sends the decoded data to the address receiving module. After receiving the decoded data, the address code extraction module 112 extracts the target data corresponding to the LED driver chip 110 of this level from the decoded data according to the address of this level corresponding to the LED driver chip 110 of this level. If the target data is the target configuration data, the working state of the LED driver chip 110 of this level is directly configured according to the target configuration data. If the target data is the target display data, the address code extraction module 112 sends the target display data to the display output module 113. After receiving the target display data, the display output module 113 can control the LED light to display according to the target display data.

[0057] It should be noted that the display output module 113 can be a DC display output module 113 using a DC dimming method, or a PWM display output module 113, which is not limited here. DC dimming is to change the brightness of the screen by increasing or decreasing the power of the screen panel circuit. Since power is equal to voltage × current, the screen brightness can be changed by simply changing the voltage or current. Taking the PWM display output module 113 as an example, the PWM display output module 113 outputs to the LED lamp in the form of PWM modulation for display, and converts the decoded display data into a PWM signal to control the LED lamp for display.

[0058] Among them, each LED driver chip 110 corresponds to only one address. In the LED driver circuit 100 of the present embodiment, the addresses of the n LED driver chips 110 can be unique, can be periodically repeated, or can be specially formulated, etc., and no specific restrictions are made here. The unique address of the n LED driver chips 110 means that the addresses corresponding to the n LED driver chips 110 are not repeated and are unique. Periodic repetition means that the addresses are arranged in a periodic cycle, such as 1, 2, 3, 4, 1, 2, 3, 4, etc. Special formulation means setting a special address, and the address difference between the LED driver chips 110 is variable, such as 1, 3, 5, 8, 15, 2, 4, 6, etc. It should be noted that special formulation is particularly beneficial for special-shaped screens and is conducive to engineering book wiring methods.

[0059] Specifically, the controller 300 sends n×Mbit (bit) data at the positive pole 210 of the common power line, where n refers to the number of LED driver chips 110 in the LED driver circuit 100, and M refers to each LED driver chip 110 receiving M bits of data. Each LED driver chip 110 counts the data when receiving the data, and then extracts the data that matches the current address of the current LED driver chip 110. Assuming that the address of the first LED driver chip 110 is 1 and the address of the current LED driver chip 110 is 3, then the received data of 1Mbit from 3×M+1bit to 4×M is output as the display data of the current LED driver chip 110 to the LED lamp for display. For example, the number of LED driver chips 110 in the LED driver circuit 100 is 2, the address of the first LED driver chip 110 is 1, and the address of the second LED driver chip 110 is 2. Each LED driver chip 110 requires 24-bit display data. The controller 300 sends 2×24-bit display data through the positive pole 210 of the common power line. The first one extracts the front 24-bit data of the 2×24-bit display data for display, and the second LED driver chip 110 extracts the back 24-bit display data of the 2×24-bit display data for display.

[0060] In one embodiment, optionally, the LED driver chip 110 also includes a filtering module 114, wherein the filtering module 114 is arranged before the decoding module 111, and the filtering module 114 is used to filter the initial carrier signal; the decoding module 111 decodes the data according to the initial carrier signal and the filtered carrier signal.

[0061] In this embodiment, the positive electrode 210 of the common power line is respectively connected to the input end of the filter module 114 and the input end of the decoding module 111, and the output end of the filter module 114 is also connected to the input end of the decoding module 111. The decoding module 111 is specifically used for decoding to obtain the first digital code when the voltage of the initial carrier signal is higher than the voltage of the filtered carrier signal; and decoding to obtain the second digital code when the voltage of the initial carrier signal is lower than the voltage of the filtered carrier signal.

[0062] Specifically, the initial carrier signal input from the positive pole 210 of the common power line enters the filtering module 114 and the decoding module 111 at the same time. The filtering module 114 filters the initial carrier signal to obtain a filtered carrier signal, and sends the filtered carrier signal to the decoding module 111. The decoding module 111 then has the initial carrier signal and the filtered carrier signal at the same time. When the voltage of the initial carrier signal is higher than the voltage of the filtered carrier signal, the decoding module 111 decodes to obtain a first digital code, such as 1; when the voltage of the initial carrier signal is lower than the voltage of the filtered carrier signal, the decoding module 111 decodes to obtain a second data code, such as 0. After decoding the data, the decoding module 111 can obtain a string of digital signals. At this time, the address code acquisition module 112 can extract the data corresponding to the LED driver chip 110 at this level from the digital signal according to the address at this level. Optionally, the filter module 114 in this embodiment can be to perform RC (Resistor-Capacitance) filtering on the initial carrier signal to filter out the jumping logic signal, that is, to filter out the initial carrier signal by RC filtering, and the filtered carrier signal obtained is stable and does not jitter, and the filtered carrier signal is used as the power signal of each LED driver chip 110, and the filtered carrier signal is compared with another initial carrier signal to decode the data. In addition, the filter module 114 can also filter the initial carrier signal by charge pump. It can be understood that the filter module 114 of this embodiment is used to filter the initial carrier signal to filter out the jumping logic signal, and is not limited to a specific filtering method. The method of filtering the jumping logic signal of the initial carrier signal can be selected according to needs.

[0063] It should be noted that, in order to ensure that the decoding module 111 can decode normally, adjacent initial carrier signals are separated by a level interval of a preset length. By separating adjacent initial carrier signals by a level interval of a preset length, the decoding module 111 is prevented from decoding multiple digital signals into one, resulting in decoding errors.

[0064] In another embodiment, when the LED driver chip 110 does not include the filtering module 114, a reference voltage can be given. When the voltage of the initial carrier signal is higher than the reference voltage, the decoding module 111 decodes to obtain a first digital code, such as 1; when the voltage of the initial carrier signal is lower than the reference voltage, the decoding module 111 decodes to obtain a second digital code, such as 0.

[0065] It should be noted that when continuous coding 1 and continuous coding 0 appear, the voltage should not be lower than the reference voltage of the power supply for a long time. Instead, each bit of the data sent by the controller 300 must return to the reference voltage of the power supply and then jump to the level of 0 or 1. For example, the reference voltage of the power supply is 5V, and a voltage lower than 5V, such as 4V, is coded 0, and a voltage higher than 5V, such as 6V, is coded 0. If code 1 and continuous coding 0 appear continuously, it is necessary that after sending 0 or 1, the voltage returns to the reference voltage of 5V, and then sends code 0 or 1 again at 4V or 6V. Correspondingly, when the LED driver chip 110 receives data, when the voltage of the initial carrier signal jumps from a voltage less than or greater than the reference voltage to the reference voltage, a code 1 or 0 is obtained.

[0066] refer to Figure 4 , Figure 4 1 is a schematic diagram of the structure of another LED driver chip provided in this embodiment. In this embodiment, the LED driver chip 110 further includes a bit rate detection module 115 and a data buffer module 116, wherein:

[0067] The bit rate detection module 115 is used to detect bit rate parameters corresponding to the display data when the data is display data;

[0068] The data buffer module 116 is used to cache the display data;

[0069] The decoding module 111 is specifically configured to receive the bit rate parameter sent by the bit rate detection module 115 and extract the display data from the data buffer module 116 to decode the target data according to the bit rate parameter.

[0070] In this embodiment, the bit rate parameter is a specific bit rate reference value, such as 800KHz (Hertz) or 1.6MHz, etc., which is not specifically limited here and depends on the bit rate of the display data sent by the controller. The data transmission of this embodiment can be controlled by a clock signal.

[0071] In this embodiment, specifically, the controller sends display data to the LED driver chip 110 at the same level in the form of a dynamic bit rate. When the LED driver chip 110 at the same level receives the display data, the bit rate detection module 115 detects the bit rate parameters corresponding to the display data, and the data buffer module 116 caches the display data. When the bit rate detection module 115 completes the detection, the decoding module 111 extracts the display data from the data buffer module 116, decodes the display data according to the bit rate parameters, and sends it to the display output module 113. The display output module 113 can control the LED light display according to the decoded display data.

[0072] For example, a video file of a dynamic motion image has a 60-frame rate in the first half and a 10-frame rate in the second half. Then the commonly used controller will decode the video and send it to the LED driver chip 110 at a fixed bit rate of 800KHz for display. Calculated based on the need to obtain 24-bit data for each LED driver chip 110, high-definition display can be achieved when 1080 chips are cascaded, and the frame rate is 1S / (1080×24×1.25US)=30.86 frames. Therefore, when this method is used for display, 30 frames of 60-frame fast pictures will be lost, and 20 frames of 10-frame pictures will be wasted, and the overall picture effect is poor. The controller can use different code rates to send display data according to the needs of screen display. For example, when the screen is highly dynamic, the display data is sent at a code rate of 1.6MHz, and when the screen is almost static, the display data is sent at a code rate of 266KHz. Correspondingly, the LED driver chip 110 of this embodiment can adaptively decode the display data sent by the controller at a dynamic code rate, thereby dynamically decoding the display data. In addition, the controller sends the display data in a dynamic code rate manner, and the LED driver chip 110 performs adaptive decoding. The high code rate used for high dynamic screens can transmit a larger amount of data and display high frame rate screens. When static or slow motion screens are used, low code rates are used for transmission, thereby saving power consumption.

[0073] In one embodiment, the decoding module 111 is specifically configured to determine a decoding threshold associated with the bit rate parameter, and decode the display data according to the decoding threshold.

[0074] Specifically, the decoding threshold refers to the threshold used to decode the display data, which is associated with the bit rate parameter. Among them, the decoding threshold = 1 / (preset coefficient * bit rate parameter), wherein the preset coefficient is greater than 1, that is, 1 / preset coefficient is less than 1. For example, 1 / preset coefficient can be 1 / 2, or it can be 1 / 3 or other numbers close to 1 / 2, such as a number whose difference from 1 / 2 is not greater than 1 / 6, etc., which can be set as needed, and no specific restrictions are made here. Preferably, the decoding threshold = 1 / (2*bit rate parameter). Exemplarily, when the bit rate parameter is 1Mbps, the period is 1us (microseconds), and the preset coefficient is 2, then the decoding threshold is 500ns (nanoseconds), then in a time period, when the high level time of the data signal of the display data is 250ns less than 500ns, the binary code is 0; when the high level time is 750ns greater than 500ns, the binary code is 1.

[0075] In one embodiment, specifically, the LED driver chip 110 at this level sends data to the LED driver chip 110 at the next level. It should be noted that the data is sent to the LED driver chip 110 at the next level through the decoding module 111 of the LED driver chip 110. Specifically, after the decoding module 111 completes decoding of the data, it will re-encode the data required by the remaining LED driver chips 110 and send it to the LED driver chip 110 at the next level, so that the remaining LED driver chips 110 can also receive the data normally.

[0076] In one embodiment, the LED driver chip 110 further includes a filtering module, which is arranged before the bit rate detection module 115 and the data buffer module 116, and is used to filter the display data and send the filtered display data to the bit rate detection module 115 and the data buffer module 116. It should be noted that the data encoded and sent to the LED driver chip 110 should send appropriate 0 and 1 data signals on the premise that the 0 code and the 1 code are as far away from the threshold as possible and are not filtered out as glitches. For example, when the decoding threshold is 500ns, the code 0 is sent with a high level time of 250ns in the middle, and the code 1 is sent with a high level time of 750ns in the middle.

[0077] In addition, when data is transmitted from the previous LED driver chip 110 to the next LED driver chip 110 through the cascade line, the transmission medium is loaded, so the transmitted data signal will be clipped, resulting in a narrower low level time or high level time of the data signal. If the clipping is too large, the codes 0 and 1 may be considered as burr noise and filtered out, or a bit error may occur, such as 0 to 1, or 1 to 0, etc., so it is necessary to adjust the centered high level time. For a bit error, it will cause the display screen to flash, and the playback effect is very poor. Specifically, when the clipping is to cut the high level, the high level will be narrowed and the low level will be widened; when the clipping is to cut the low level, the low level will be narrowed and the high level will be widened. The specific clipping method is related to the working mode, and is not specifically limited here. The high level time and the low level time can be adjusted according to the type of clipping.

[0078] Specifically, when clipping is to clip the low level and the binary code is 0, the high level time is adjusted so that the high level time is far away from the decoding threshold and the difference between the high level time and the decoding threshold is greater than the clipping amplitude; when clipping is to clip the low level and the binary code is 1, the high level time is adjusted so that the high level time is close to the decoding threshold and the high level time is greater than the decoding threshold; when clipping is to clip the high level and the binary code is 0, the high level time is adjusted so that the high level time is close to the decoding threshold and the high level time is less than the decoding threshold; when clipping is to clip the high level and the binary code is 1, the high level time is adjusted so that the high level time is far away from the decoding threshold and the difference between the high level time and the decoding threshold is greater than the clipping amplitude.

[0079] For example, when the decoding threshold is 500ns, the high level time of 250ns is generally used as the data signal of code 0, and the high level time of 750ns is used as the data signal of code 1. When the clipping is to clip the low level and the code is 0, the high level time can be adjusted to 150ns for transmission; when the clipping is to clip the low level and the code is 1, the high level time can be adjusted to 650ns; when the clipping is to clip the high level and the code is 0, the high level time can be adjusted to 350ns; when the clipping is to clip the high level and the code is 1, the high level time can be adjusted to 850ns.

[0080] It is understandable that a configuration data may be sent before transmitting data to inform each LED driver chip 110 of its working mode, so that the LED driver chip 110 re-encodes the data according to the clipping mode related to the working mode and sends it to the next-level LED driver chip 110.

[0081] refer to Figure 5 , Figure 51 is a schematic diagram of the structure of another LED driver chip provided in this embodiment. In this embodiment, there are multiple decoding modules 111, and the multiple decoding modules 111 sequentially receive data sent by the controller at preset time intervals.

[0082] In this embodiment, each decoding module 111 is used to receive data sent by the controller and decode the data. The number of decoding modules 111 can be selected to increase as needed, and no specific limitation is made here. Multiple decoding modules 111 means that the number of decoding modules 111 is at least two. It can be understood that no matter whether the input data is configuration data or display data, when part of the multiple decoding modules 111 is damaged or abnormal, as long as one decoding module 111 is normal, the input data can be received normally for normal decoding, and then configuration or display can be performed.

[0083] For example, if the video image has a frame rate of 120, and it is assumed that the highest code stream that the decoding module 111 can encode and decode is 800KHz, then 24×1.25US×1080=32.4ms, which is about 30 frames. In other words, when 1080 LED driver chips 110 are cascaded, a single channel can only decode 30 frames of images. The traditional single-channel chip can only decode 30 frames. However, through the technical solution of this embodiment, when the number of multiple decoding modules 111 is 4, 4×30 frames (single decoding module 111)=120 frames. Without improving the performance of a single decoding module 111, that is, without increasing the highest code stream that the decoding module 111 can encode and decode to 800KHz, the four decoding modules 111 can improve the display quality of the image and achieve a 120 frame rate image display.

[0084] It should be noted that the multiple decoding modules 111 sequentially receive the display data sent by the upper component at a preset time interval, and the preset time interval = the ratio of the continuous display time of each frame of image data to the number of working of the multiple decoding modules 111. Exemplarily, assuming that each frame of image data is 32ms, there are 4 decoding modules 111 and the 4 decoding modules 111 are working, the first frame of display data is sent to the first decoding module 111 first, and the second frame of display data is sent to the second decoding module 111 after (32 / 4) = 8ms, and the third frame of display data is sent to the third decoding module 111 after 8ms, and the fourth frame of display data is sent to the fourth decoding module 111 after 8ms. It can be understood that when there are 4 decoding modules 111, each frame of data is 32ms, then when there is 1 decoding module 111, a frame of data is refreshed every 32ms, and the frame rate is about 30, but when there are 4 decoding modules 111, a frame of data can be refreshed every 8ms, thereby improving the display frame rate of the video. It can be understood that when the number of working decoding modules 111 is 2, a frame of image data is sent at an interval of 32 / 2=16ms.

[0085] The technical solution of the embodiment of the present invention is that the LED driving circuit includes n LED driving chips, where n≥2; one end of each LED driving chip is electrically connected to the positive pole of the common power line; the other end of each LED driving chip is electrically connected to the negative pole of the common power line; wherein the positive pole and the negative pole of the common power line are respectively connected to the controller, and the controller is used to transmit data in the form of an initial carrier signal at the positive pole of the common power line to each LED driving chip, so as to achieve the technical effect of reducing the complexity of the LED driving circuit and improving the stability of data transmission. In addition, the manifestation of the failure is only that the LED lamp driven by the damaged LED driving chip does not light up, and the bad point can be quickly located.

[0086] Figure 6 FIG. 1 is a schematic diagram of a structure of an LED driving system provided by an embodiment of the present invention. Figure 6 As shown, an embodiment of the present invention provides an LED driving system 10 , including a controller 300 and an LED driving circuit 100 .

[0087] in:

[0088] The LED driving circuit 100 includes n LED driving chips 110 , where n ≥ 2;

[0089] The controller 300 is connected to one end of each LED driver chip 110 via the positive pole 210 of the common power line, and the controller 300 is connected to the other end of each LED driver chip 110 via the positive pole 210 of the common power line. The controller 300 is used to transmit data to each LED driver chip 110 at the positive pole 210 of the common power line in the form of an initial carrier signal.

[0090] It can be understood that the LED driving circuit 100 in this embodiment can refer to the description of any of the above embodiments, and this embodiment will not be described in detail.

[0091] The technical solution of the embodiment of the present invention is that the LED driving system LED driving circuit includes an LED driving chip, and the LED driving circuit includes n LED driving chips, where n≥2; one end of each of the LED driving chips is electrically connected to the positive pole of the common power line; the other end of each of the LED driving chips is electrically connected to the negative pole of the common power line; wherein the positive pole and the negative pole of the common power line are respectively connected to the controller, and the controller is used to transmit data in the form of an initial carrier signal at the positive pole of the common power line to each of the LED driving chips, so as to achieve the technical effect of reducing the complexity of the LED driving circuit and improving the stability of data transmission. In addition, the manifestation of the failure is only that the LED lamp driven by the damaged LED driving chip does not light up, and the bad point can also be quickly located.

[0092] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An LED driving circuit, characterized in that: The LED driving circuit includes n LED driving chips, where n≥2; One end of each of the LED driver chips is electrically connected to the positive electrode of the common power line; The other end of each LED driver chip is electrically connected to the negative electrode of the common power line; Wherein, the positive electrode and the negative electrode of the common power line are respectively connected to the controller, and the controller is used to transmit data in the form of an initial carrier signal at the positive electrode of the common power line to each of the LED driver chips; The data includes configuration data and / or display data; The configuration data is used to configure the working state of the LED driver chip; The display data is used to drive the LED driver chip to control the LED lamp to display; Each of the LED driver chips is pre-configured with an address, and the LED driver chip comprises: A decoding module, the decoding module is used to receive the data from the positive electrode of the common power line and decode the data; A filtering module, which is arranged before the decoding module and is used to filter the initial carrier signal; The positive electrode of the common power line is connected to the input end of the filter module and the input end of the decoding module respectively, and the output end of the filter module is connected to the input end of the decoding module; The decoding module decodes the data according to the initial carrier signal and the filtered carrier signal; The decoding module is specifically used for decoding to obtain a first digital code when the voltage of the initial carrier signal is higher than the voltage of the filtered carrier signal; When the voltage of the initial carrier signal is lower than the voltage of the filtered carrier signal, the second digital code is obtained by decoding.

2. The LED driving circuit according to claim 1, characterized in that: The LED driver chip also includes: An address code fetching module, the address code fetching module is used to receive the decoded data, and extract the target data corresponding to the LED driver chip at this level from the decoded data according to the current address corresponding to the LED driver chip at this level; The display output module is used to receive the target display data sent by the address code acquisition module when the data is display data, so as to control the LED light to display according to the target display data.

3. The LED driving circuit according to claim 1, characterized in that: Adjacent initial carrier signals are spaced apart by a level interval of a preset length.

4. The LED driving circuit according to claim 1, characterized in that: The n LED driver chips are electrically connected in series, and the first-stage LED driver chip is electrically connected to the controller; The LED driving circuit receives the address and configuration data sent by the controller during initialization.

5. The LED driving circuit according to claim 1, characterized in that: The LED driver chip also includes: A bit rate detection module, used for detecting a bit rate parameter corresponding to the display data when the data is display data; A data buffer module, used for caching the display data; The decoding module is specifically used to receive the bit rate parameter sent by the bit rate detection module, and extract the display data from the data buffer module to decode the target data according to the bit rate parameter.

6. The LED driving circuit according to claim 1, characterized in that: There are multiple decoding modules; The plurality of decoding modules sequentially receive the data sent by the controller at preset time intervals.

7. An LED driving system, characterized in that: The LED driving circuit comprises the LED driving circuit as described in any one of claims 1 to 6, and further comprises a controller, wherein the controller is connected to one end of each of the LED driving chips through the positive pole of a common power line, and the controller is connected to the other end of each of the LED driving chips through the positive pole of the common power line, and the controller is used to transmit data to each of the LED driving chips at the positive pole of the common power line in the form of an initial carrier signal.

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