WO2021174805A1 - 一种Mini-LED光源及其驱动电路和驱动方法 - Google Patents

一种Mini-LED光源及其驱动电路和驱动方法 Download PDF

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WO2021174805A1
WO2021174805A1 PCT/CN2020/115252 CN2020115252W WO2021174805A1 WO 2021174805 A1 WO2021174805 A1 WO 2021174805A1 CN 2020115252 W CN2020115252 W CN 2020115252W WO 2021174805 A1 WO2021174805 A1 WO 2021174805A1
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led light
mini
driving
light source
module
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PCT/CN2020/115252
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English (en)
French (fr)
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袁博
解明
陈波
陈赞添
戴奇峰
鲍晓杰
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深圳创维－Rgb电子有限公司
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Publication of WO2021174805A1 publication Critical patent/WO2021174805A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources

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  • the present disclosure relates to the field of LED technology, and in particular to a Mini-LED light source and its driving circuit and driving method.
  • the Mini-LED backlight light source in a unit area has a larger number of LEDs than the traditional LED backlight light source, which can realize multi-zone control.
  • Using Mini-LED backlight light source as the backlight light source of the display device can more effectively improve the dynamic contrast of the product and improve the picture quality.
  • Mini-LED light sources mostly adopt a static constant current driving mode, that is, each Mini-LED area (single or multiple series and parallel connected to form an independent controllable area) has a separate control loop.
  • the number of partitions often reaches thousands or even tens of thousands.
  • more control circuits are needed to complete the drive and constant current control.
  • the number of 12-channel driver chips required is 1050-9450, and the number of peripheral components is even larger. It is also necessary to add an FPGA control board to achieve the multi-zone constant current drive effect. .
  • This traditional solution requires a large number of components, complex processing technology, low reliability, and is not conducive to energy saving and environmental protection. Moreover, due to the large number of components used and the complex circuit network, the development and production of the LED lamp board and the constant current drive circuit are usually adopted, that is, the LED lamp is mounted on one side of the PCB board, and the constant current drive circuit is mounted on the other side. This solution makes the LED drive circuit and the light board designed inside the entire module, which is extremely poor in maintainability compared to the ordinary whole module.
  • the purpose of the present disclosure is to provide a Mini-LED light source and its driving circuit and driving method, which can effectively solve the large number of components, complex circuits, and circuits in the existing Mini-LED light source driving scheme. It is not conducive to the problems of mass production and poor maintainability.
  • a drive circuit for Mini-LED light source is connected to the main board of a display device, and includes an LED array, a row drive module, a column drive module, and a control module.
  • the LED array includes M rows of LED light strings and N columns of LED light strings. And M are both positive integers;
  • the control module outputs the brightness information and scan period output by the main board to the column driving module, and outputs M scan signals to the row driving module according to the brightness information according to a preset timing;
  • the row driving module respectively provides operating power for the M rows of the LED light strings according to the M scanning signals;
  • the column driving module drives the N columns of the LED light strings to light up according to the brightness information and the scanning period.
  • the column driving module further outputs feedback information to the control module according to the brightness information.
  • the row driving module includes a row driving unit and a blanking unit; the row driving unit provides working power for the M rows of the LED light string according to the M scanning signals.
  • the blanking unit is used to output precharge energy to each of the LED light strings in the output gap of two adjacent scan signals.
  • the column drive module includes a number of column drive units connected in series, and each of the column drive units drives n columns of the LED light strings according to brightness information, and all connected at the end
  • the column driving unit outputs the feedback information to the control module according to the brightness information, and n is a positive integer greater than 1 and less than N.
  • the row driving unit includes M first switches; one end of each first switch is connected to a power supply terminal, and the other end of each first switch is respectively The positive poles of the M rows of the LED light strings are connected, and the control end of each of the first switches is connected to the control module.
  • the blanking unit includes a second switch; one end of the second switch is connected to the power supply terminal, and the other end of the second switch is connected to the LED light string Negative, the control terminal of the second switch is connected to the control module.
  • the column driving unit includes a driving chip, and the driving chip is connected to the negative electrode of the LED light string in the column and the control module.
  • control module includes a control chip, and the control chip is respectively connected to the main board, the row driving unit and the blanking unit.
  • the first switch includes a triode, a relay, a MOS tube or a transmission gate.
  • the second switch includes a triode, a relay, a MOS tube or a transmission gate.
  • the model of the driving chip is NT50582 or IW7039.
  • the preset timing is related to the scanning period and the number of scanning signals to be output.
  • a driving method of Mini-LED light source includes the following steps:
  • the control module outputs the brightness information and scan period output by the main board to the column driving module, and outputs N scan signals to the row driving module according to the brightness information according to a preset timing;
  • the row driving module provides operating power for the N rows of the LED light strings respectively according to the N scan signals;
  • the column driving module drives the M columns of LED light strings to light up according to the brightness information and the scanning period.
  • the step of the row driving module respectively providing operating power for the N rows of the LED light strings according to the N scanning signals includes:
  • the row driving module includes a row driving unit and a blanking unit; the row driving unit provides operating power for the N rows of the LED light strings according to the N scanning signals;
  • the blanking unit outputs precharge energy to each of the LED light strings in the output gap of two adjacent scan signals.
  • a Mini-LED light source comprising a PCB board and a light board, and further comprising a driving circuit for the Mini-LED light source as described above, the control module, the row driving module, and the column driving module are arranged on the PCB board Above, the LED array is arranged on the light board.
  • the present disclosure provides a Mini-LED light source and a driving circuit and driving method thereof.
  • the driving circuit includes an LED array, a row driving module, a column driving module, and a control module.
  • the LED array includes M Row LED light string and N column LED light string, N and M are both positive integers;
  • the control module outputs the brightness information and scanning period output by the main board to the column driving module, and according to the brightness information according to a preset timing Output M scanning signals to the row driving module;
  • the row driving module provides operating power for the M rows of the LED light strings according to the M scanning signals;
  • the column driving module according to the brightness information and the scanning period
  • Fig. 1 is a structural block diagram of a Mini-LED light source driving circuit provided by the present disclosure
  • Fig. 2 is a schematic circuit diagram of a Mini-LED light source driving circuit provided by the present disclosure
  • FIG. 3 is a timing diagram of scan signals, precharge energy, and scan period in the Mini-LED light source driving circuit provided by the present disclosure
  • FIG. 4 is a flowchart of a driving method of Mini-LED light source provided by the present disclosure
  • FIG. 5 is a flowchart of step S200 in the driving method of the Mini-LED light source provided by the present disclosure.
  • the present disclosure provides a Mini-LED light source and a driving circuit and driving method thereof, which can effectively solve the problems of large number of components, complex circuits, unfavorable mass production and poor maintainability in the existing Mini-LED light source driving scheme.
  • the Mini-LED light source driving circuit is connected to the main board 10 of the display device, and includes an LED array 100, a row driving module 200, a column driving module 300, and a control module 400.
  • the LED array 100 It includes M rows of LED light strings and N columns of LED light strings, where N and M are both positive integers; each of the LED light strings are connected in series, and the anode of each LED light string is connected to the row driving module 200, The negative pole of each LED light string is connected to the column driving module 300, the row driving module 200 and the column driving module 300 are also connected to the control module 400, and the control module 400 is also connected to the The main board 10 is connected.
  • the control module 400 outputs the brightness information SPI and the scan period VSYNC output by the main board 10 to the column driving module 300, and outputs M scan signals to the row driving module according to the brightness information SPI according to a preset timing. 200;
  • the preset timing is determined according to the scan period VSYNC and the number of scan signals that need to be output, that is, the control module 400 in this embodiment separates M according to the time interval of 1/M* scan period VSYNC
  • the scanning signals are output to the row driving module 200, and the row driving module 200 provides working power for the M rows of the LED light strings according to the M scanning signals; at the same time, the column driving module 300 According to the brightness information SPI and the scanning period VSYNC, the N columns of the LED light strings are driven to light.
  • the present disclosure drives the LED light strings to light through the matrix control method, which can reduce the number of components and reduce the cost.
  • the column driving module 300 also outputs feedback information to the control module 400 according to the brightness information SPI.
  • the control module 400 After the control module 400 outputs the brightness information SPI to the column driving module 300, the The column driving module 300 will output feedback information to the control module 400.
  • the column driving module 300 will feedback the received brightness information SPI to the control module 400 to indicate that the column driving The module 300 is in a normal working state. Therefore, the control module 400 determines whether the column driving module 300 is working normally according to whether the brightness information SPI output by the column driving module 300 is received, so as to realize the feedback of the driving circuit. Detection function.
  • the row driving module 200 includes a row driving unit 210 and a blanking unit 220.
  • the row driving unit 210 is connected to the control module 400 and the anode of each of the LED light strings.
  • the hidden unit 220 is connected to the control module 400 and the negative electrode of each of the LED light strings; the row driving unit 210 provides working power for the M rows of the LED light strings according to the M scan signals; the blanking unit 220 is used to output the pre-charge energy Pre-charge to each of the LED light strings in the output gap of two adjacent scan signals.
  • the timing diagram of the pre-charge energy Pre-charge is shown in FIG. While each of the LED light strings is lit, the blanking unit 220 is used to precharge the negative electrode of the LED light string that received the previous scan signal, forcing the corresponding LED light string to quickly interrupt the current, And then achieve the purpose of eliminating afterimages.
  • the column drive module 300 includes a number of column drive units connected in series, each of the column drive units connected in series is connected to the negative electrode of the LED light string in the column, wherein the column is connected end to end.
  • the driving unit is also connected to the control module 400; each of the column driving units drives n columns of the LED string according to the brightness information SPI, and the column driving unit connected at the end outputs feedback information according to the brightness information SPI to In the control module 400, n is a positive integer greater than 1 and less than M.
  • the control module 400 outputs the brightness information SPI to the first column driving unit, and then the first column driving unit outputs to the next column driving unit, and so on, each of the The column driving unit can obtain the brightness information SPI output by the control module 400, and the column driving unit connected at the end also feeds back the received brightness information SPI to the control module 400, indicating that each column driver The units have received the brightness information SPI in a normal working state; because the brightness information SPI output by the control module 400 includes the brightness information SPI of the LED string of the entire LED array 100, and each of the column driving units It only drives the n columns of the LED light strings connected to it.
  • each column driving unit After each column driving unit receives the brightness information SPI, it will only select the correspondingly controlled n columns of the LED light strings required by the brightness
  • the information SPI is used to drive the current of the n columns of the LED light string, that is, the current of the n columns of the LED light string is matched with the brightness information SPI, thereby realizing the control of the LED light string of the entire LED array 100
  • the brightness is controlled to complete the screen display of the backlight light source.
  • the row driving unit 210 includes M first switches K1; one end of each first switch K1 is connected to the power supply terminal, and the other end of each first switch K1 is connected to the M row stations respectively.
  • each first switch K1 is connected to the control module 400, and the control module 400 outputs the M scanning signals to the scanning period VSYNC according to the preset timing.
  • the blanking unit 220 includes a second switch K2.
  • One end of the second switch K2 is connected to the power supply terminal, and the other end of the second switch K2 is connected to each of the LED light strings.
  • the control terminal of the second switch K2 is connected to the control module 400, and the control module 400 is in the interval between two adjacent scan signals, that is, after the previous scan signal is output, and before the next scan signal is output.
  • the second switch K2 is controlled to be turned on to supply power to the negative electrode of the corresponding LED light string, so that the voltage of the positive electrode and the negative electrode of the LED light string are the same, and the current flowing through the corresponding LED light string is interrupted to achieve The purpose of eliminating residual images; wherein, the first switch K1 and the second switch K2 can be realized by relays, triodes, MOSFETs, transmission gates, and the like.
  • the column driving unit includes a driving chip IC, which is connected to the negative electrode of the LED light string in the column and the control module 400.
  • each of the driving chip ICs The signal terminals LED1 to LEDn are respectively connected to the negative poles of the LED light strings of N columns, the first SPI pin of the driver chip IC is connected to the control module 400, and the VSYNC signal terminal of each driver chip IC is connected to the control module 400, the model of the driver chip IC in this embodiment is NT50582 or IW7039.
  • a driver chip IC with the same function can also be selected, which is not limited in the present disclosure.
  • control module 400 includes a control chip MCU, which is connected to the motherboard 10, the control terminal of the first switch K1, the control terminal of the second switch K2, and the drive chip IC Or the control module 400 includes an FPGA, which is not limited in the present disclosure.
  • the motherboard 10 After the motherboard 10 completes the calculation of the backlight brightness of the corresponding area, it outputs the brightness information SPI to the control chip MCU.
  • the set scan period VSYNC is also correspondingly output to the control chip MCU.
  • the brightness information SPI is transmitted to each of the driving chip ICs, and the scan signal is output according to the brightness information SPI to provide working power for the LED light string, so as to achieve the purpose of matching the current of the LED light string and the image brightness, through the matrix type
  • the control method can effectively reduce the number of driver chip ICs and the number of components, thereby simplifying the circuit structure of backlight driving and reducing costs; the control chip MCU in this embodiment can choose STM32 series or GD32 series chips, of course you can choose Other control chip MCUs with the same function are not limited in this disclosure.
  • the present disclosure also correspondingly provides a Mini-LED light source driving method.
  • the driving method includes the following steps:
  • the control module outputs the brightness information and the scan period output by the main board to the column driving module, and outputs N scan signals to the row driving module according to a preset timing according to the brightness information;
  • the row driving module provides operating power for the N rows of the LED light strings respectively according to the N scanning signals;
  • the column driving module drives the M columns of LED light strings to light up according to the brightness information and the scanning period.
  • the step S200 includes:
  • the row driving unit provides operating power for the N rows of the LED light strings respectively according to the N scanning signals;
  • S220 The blanking unit outputs precharge energy to each of the LED light strings in the output gap of two adjacent scan signals.
  • the present disclosure also correspondingly provides a Mini-LED light source, including the aforementioned Mini-LED light source drive circuit, PCB board and light board, wherein the Mini-LED light source
  • the control module, the row drive module, and the column drive module in the drive circuit are all arranged on the PCB board, the LED array is arranged on the light board, and the PCB board and the The light boards are independent of each other, and the LED light board and the driving circuit are separated and arranged.
  • the main board and the PCB board are installed on the back panel of the whole machine together, and the LED light board is connected with The LED light board is connected, so that by separating the LED light board from the drive circuit, it is beneficial to the after-sales maintenance of the whole machine and the module.
  • the present disclosure provides a Mini-LED light source and a driving circuit and driving method thereof.
  • the driving circuit includes an LED array, a row driving module, a column driving module, and a control module.
  • the LED array includes M rows of LEDs. For the light string and the N columns of LED light strings, N and M are both positive integers; the control module outputs the brightness information and scanning period output by the main board to the column driving module, and outputs M according to the preset timing according to the brightness information Scan signals to the row drive module; the row drive module provides operating power for the M rows of the LED light strings according to the M scan signals; the column drive module drives N according to the brightness information and the scan period
  • the LED light string is lit, and the present disclosure can effectively solve the problems of large number of components, complex circuits, unfavorable mass production, and poor maintainability in the existing Mini-LED light source driving solution.

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Abstract

一种Mini-LED光源及其驱动电路和驱动方法，驱动电路包括LED阵列（100）、行驱动模块（200）、列驱动模块（300）和控制模块（400），LED阵列（100）包括M行LED灯串和N列LED灯串，N和M均为正整数；控制模块（400）将主板输出的亮度信息和扫描周期输出至列驱动模块（300），并根据亮度信息依据预设时序输出M个扫描信号至行驱动模块（200）；行驱动模块（200）根据M个扫描信号分别为M行LED灯串提供工作电能；列驱动模块（300）根据亮度信息和扫描周期驱动N列LED灯串点亮。有效解决现有Mini-LED光源驱动方案中元器件数目多、电路复杂、不利于批量生产和维修性差的问题。

Description

一种Mini-LED光源及其驱动电路和驱动方法 技术领域
本公开涉及LED技术领域，特别涉及一种Mini-LED光源及其驱动电路和驱动方法。
背景技术
单位面积内Mini-LED背光光源相比传统LED背光光源具有更多数量数目的LED，可以实现多分区控制。将Mini-LED背光光源作为显示设备的背光光源，可以更有效地提高产品的动态对比度，提升画质。
现有驱动Mini-LED光源的方案多采用静态恒流驱动方式，即每一个Mini-LED区域(单颗或多颗串并联组成一个独立可控的区域)有一个单独的控制回路。对于Mini-LED光源的实际应用场景而言，分区数往往达到数千甚至数万区。在这些分区较多的应用场合，需要更多的控制电路来完成驱动及恒流控制。以传统的某65寸Mini-LED背光电视为例，12通道驱动芯片需要的数量在1050-9450个，外围元器件数量更庞大，还需要加上FPGA控制板才能实现多分区的恒流驱动效果。这种传统的方案需要的元器件数量庞大、加工工艺复杂、可靠性低、不利于节能环保。且由于元器件使用数量庞大，电路网络复杂，通常采用LED灯板和恒流驱动电路一体化的思路开发生产，即LED灯贴装在PCB板一面，恒流驱动电路贴装在另一边面。这种方案使得LED驱动电路连同灯板被设计在了整个模组内部，相对普通整机模组可维修性极差。
因而现有技术还有待改进和提高。
公开内容
鉴于上述现有技术的不足之处，本公开的目的在于提供一种Mini-LED光源及其驱 动电路和驱动方法，能够有效解决现有Mini-LED光源驱动方案中元器件数目多、电路复杂、不利于批量生产和维修性差的问题。
为了达到上述目的，本公开采取了以下技术方案：
一种Mini-LED光源的驱动电路，与显示设备的主板连接，包括LED阵列、行驱动模块、列驱动模块和控制模块，所述LED阵列包括M行LED灯串和N列LED灯串，N和M均为正整数；所述控制模块将主板输出的亮度信息和扫描周期输出至所述列驱动模块，并根据所述亮度信息依据预设时序输出M个扫描信号至所述行驱动模块；所述行驱动模块根据M个所述扫描信号分别为M行所述LED灯串提供工作电能；所述列驱动模块根据所述亮度信息和扫描周期驱动N列所述LED灯串点亮。
所述的Mini-LED光源的驱动电路中，所述列驱动模块还根据所述亮度信息输出反馈信息至所述控制模块。
所述的Mini-LED光源的驱动电路中，所述行驱动模块包括行驱动单元和消隐单元；所述行驱动单元根据M个所述扫描信号分别为M行所述LED灯串提供工作电能；所述消隐单元用于在相邻两个所述扫描信号的输出间隙输出预充电能至各个所述LED灯串。
所述的Mini-LED光源的驱动电路中，所述列驱动模块包括若干串联连接的列驱动单元，每个所述列驱动单元根据亮度信息驱动n列所述LED灯串，且末尾连接的所述列驱动单元根据所述亮度信息输出所述反馈信息至所述控制模块，n为大于1小于N的正整数。
所述的Mini-LED光源的驱动电路中，所述行驱动单元包括M个第一开关；每个所述第一开关的一端均连接供电端，每个所述第一开关的另一端均分别连接M行所述LED灯串的正极，每个所述第一开关的控制端均连接所述控制模块。
所述的Mini-LED光源的驱动电路中，所述消隐单元包括第二开关；所述第二开关的一端连接供电端，所述第二开关的另一端均连接各个所述LED灯串的负极，所述第二开关的控制端连接所述控制模块。
所述的Mini-LED光源的驱动电路中，所述列驱动单元包括驱动芯片，所述驱动芯片连接所在列的所述LED灯串的负极和所述控制模块。
所述的Mini-LED光源的驱动电路中，所述控制模块包括控制芯片，所述控制芯片分别连接所述主板、所述行驱动单元和所述消隐单元。
所述的Mini-LED光源的驱动电路中，所述第一开关包括三极管、继电器、MOS管或传输门。
所述的Mini-LED光源的驱动电路中，所述第二开关包括三极管、继电器、MOS管或传输门。
所述的Mini-LED光源的驱动电路中，所述驱动芯片的型号为NT50582或IW7039。
所述的Mini-LED光源的驱动电路中，所述预设时序与所述扫描周期和需要输出的扫描信号的个数相关。
一种Mini-LED光源的驱动方法，包括如下步骤：
所述控制模块将主板输出的亮度信息和扫描周期输出至所述列驱动模块，并根据所述亮度信息依据预设时序输出N个扫描信号至所述行驱动模块；
所述行驱动模块根据N个所述扫描信号分别为N行所述LED灯串提供工作电能；
所述列驱动模块根据所述亮度信息和扫描周期驱动M列所述LED灯串点亮。
所述的Mini-LED光源的驱动方法中，所述行驱动模块根据N个所述扫描信号分别为N行所述LED灯串提供工作电能的步骤包括：
所述行驱动模块包括行驱动单元和消隐单元；所述行驱动单元根据N个所述扫描信号分别为N行所述LED灯串提供工作电能；
所述消隐单元在相邻两个所述扫描信号的输出间隙输出预充电能至各个所述LED灯串。
一种Mini-LED光源，包括PCB板和灯板，还包括如上所述的Mini-LED光源的驱动电路，所述控制模块、所述行驱动模块和所述列驱动模块设置在所述PCB板上，所述LED阵列设置在所述灯板上。
相较于现有技术，本公开提供的一种Mini-LED光源及其驱动电路和驱动方法，所述驱动电路包括LED阵列、行驱动模块、列驱动模块和控制模块，所述LED阵列包括M行LED灯串和N列LED灯串，N和M均为正整数；所述控制模块将主板输出的亮 度信息和扫描周期输出至所述列驱动模块，并根据所述亮度信息依据预设时序输出M个扫描信号至所述行驱动模块；所述行驱动模块根据M个所述扫描信号分别为M行所述LED灯串提供工作电能；所述列驱动模块根据所述亮度信息和扫描周期驱动N列所述LED灯串点亮，本公开能够有效解决现有Mini-LED光源驱动方案中元器件数目多、电路复杂、不利于批量生产和维修性差的问题。
附图说明
图1为本公开提供的Mini-LED光源的驱动电路的结构框图；
图2为本公开提供的Mini-LED光源的驱动电路的电路原理图；
图3为本公开提供的Mini-LED光源的驱动电路中扫描信号、预充电能和扫描周期的时序图；
图4为本公开提供的Mini-LED光源的驱动方法的流程图；
图5为本公开提供的Mini-LED光源的驱动方法中步骤S200的流程图。
具体实施方式
本公开提供一种Mini-LED光源及其驱动电路和驱动方法，能够有效解决现有Mini-LED光源驱动方案中元器件数目多、电路复杂、不利于批量生产和维修性差的问题。
为使本公开的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本公开进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本公开，并不用于限定本公开。
实施例1
请参阅图1，本公开提供的Mini-LED光源的驱动电路，与显示设备的主板10连接，其包括LED阵列100、行驱动模块200、列驱动模块300和控制模块400，所述LED阵列100包括M行LED灯串和N列LED灯串，N和M均为正整数；各个所述LED灯串均串联连接，且每个所述LED灯串的正极均连接所述行驱动模块200，每个所述LED灯串的负极均连接所述列驱动模块300，所述行驱动模块200和所述列驱动模块300还 均与所述控制模块400连接，所述控制模块400还与所述主板10连接。
其中，所述控制模块400将主板10输出的亮度信息SPI和扫描周期VSYNC输出至所述列驱动模块300，并根据所述亮度信息SPI依据预设时序输出M个扫描信号至所述行驱动模块200；所述预设时序是依据所述扫描周期VSYNC和需要输出扫描信号的个数来确定的，即本实施例中所述控制模块400依据1/M*扫描周期VSYNC的时间间隔分别将M个所述扫描信号输出至所述行驱动模块200，所述行驱动模块200根据M个所述扫描信号分别为M行所述LED灯串提供工作电能；与此同时，所述列驱动模块300根据所述亮度信息SPI和扫描周期VSYNC驱动N列所述LED灯串点亮，本公开通过矩阵的控制方式驱动所述LED灯串点亮，可降低元器件的数量，降低成本。
进一步地，所述列驱动模块300还根据所述亮度信息SPI输出反馈信息至所述控制模块400，当所述控制模块400将所述亮度信息SPI输出给所述列驱动模块300之后，所述列驱动模块300会输出反馈信息给所述控制模块400，本实施例中所述列驱动模块300会将接收的所述亮度信息SPI反馈输出给所述控制模块400，以此表明所述列驱动模块300为正常工作状态，由此，所述控制模块400根据是否接收到所述列驱动模块300输出的所述亮度信息SPI来确定所述列驱动模块300是否正常工作，进而实现驱动电路的反馈检测功能。进一步地，请参阅图2，所述行驱动模块200包括行驱动单元210和消隐单元220，所述行驱动单元210连接所述控制模块400和各个所述LED灯串的正极，所述消隐单元220连接所述控制模块400和各个所述LED灯串的负极；所述行驱动单元210根据M个所述扫描信号分别为M行所述LED灯串提供工作电能；所述消隐单元220用于在相邻两个所述扫描信号的输出间隙输出预充电能Pre-charge至各个所述LED灯串，所述预充电能Pre-charge的时序图如图3所示，在实现驱动各个所述LED灯串点亮的同时，通过所述消隐单元220为接收上一个所述扫描信号的所述LED灯串的负极进行预充电，迫使对应的所述LED灯串快速中断电流，进而达到消残影的目的。进一步地，所述列驱动模块300包括若干串联连接的列驱动单元，串联连接的每个所述列驱动单元均与所在列的所述LED灯串的负极连接，其中，首尾连个所述列驱动单元还与所述控制模块400连接；每个所述列驱动单元根据亮度信息SPI驱动n列所述LED灯 串，且末尾连接的所述列驱动单元根据所述亮度信息SPI输出反馈信息至所述控制模块400，n为大于1小于M的正整数。
具体地，所述控制模块400将所述亮度信息SPI输出给首个所述列驱动单元，之后由首个所述列驱动单元输出给下一个所述列驱动单元，依次类推，每个所述列驱动单元均可获取所述控制模块400输出的亮度信息SPI，且末尾连接的所述列驱动单元还将接收的所述亮度信息SPI反馈给所述控制模块400，表明每个所述列驱动单元均接收到了所述亮度信息SPI处于正常工作状态；由于所述控制模块400输出的所述亮度信息SPI包含了整个LED阵列100的LED灯串的亮度信息SPI，而每个所述列驱动单元只是驱动与之连接的n列所述LED灯串，因此，每个所述列驱动单元在接收到所述亮度信息SPI后，只会选择对应控制的n列所述LED灯串所需要的亮度信息SPI来驱动这n列所述LED灯串的电流，也即这n列所述LED灯串的电流是与亮度信息SPI相匹配，由此实现对整个所述LED阵列100的LED灯串的亮度进行控制，进而完成背光光源的画面显示。具体实施时，所述行驱动单元210包括M个第一开关K1；每个所述第一开关K1的一端均连接供电端，每个所述第一开关K1的另一端均分别连接M行所述LED灯串的正极，每个所述第一开关K1的控制端均连接所述控制模块400，所述控制模块400根据所述扫描周期VSYNC依据预设时序分别输出M个所述扫描信号至M个第一开关K1，如图3中的扫描信号scan1～scanm，控制各个所述第一开关K1的导通或关断，进而实现对所述LED灯串的供电。
进一步地，请继续参阅图2，所述消隐单元220包括第二开关K2，所述第二开关K2的一端连接供电端，所述第二开关K2的另一端均连接各个所述LED灯串的负极，所述第二开关K2的控制端连接所述控制模块400，所述控制模块400在相邻两个所述扫描信号的间隔时间也即上一个扫描信号输出之后下一个扫描信号输出之前控制所述第二开关K2导通，为对应所述LED灯串的负极供电，使得所述LED灯串的正极和负极的电压相同，流经对应所述LED灯串的电流被中断，以达到消除残影的目的；其中，所述第一开关K1和所述第二开关K2均可通过继电器、三极管、MOSFET、传输门等实现。进一步地，所述列驱动单元包括驱动芯片IC，所述驱动芯片IC连接所在列的所 述LED灯串的负极和所述控制模块400，如图2所示，每个所述驱动芯片IC的LED1～LEDn信号端分别连接N列所述LED灯串的负极，首位所述驱动芯片IC的SPI引脚连接所述控制模块400，每个所述驱动芯片IC的VSYNC信号端连接所述控制模块400，本实施例中所述驱动芯片IC的型号为NT50582或IW7039，当然在其他实施例中也可以选择具有相同功能的驱动芯片IC，本公开对此不作限定。其中不同型号的驱动芯片IC可驱动所述LED灯串的列数并不相同，即n的值不同，具体可为12、16、32或48等本公开对此不做限定。进一步地，所述控制模块400包括控制芯片MCU，所述控制芯片MCU连接上所述主板10、所述第一开关K1的控制端、所述第二开关K2的控制端和所述驱动芯片IC；或者所述控制模块400包括FPGA，本公开对此不作限定。所述主板10将对应区域背光亮度计算完成之后，将亮度信息SPI输出给所述控制芯片MCU，同时将设定好的扫描周期VSYNC也对应输出给所述控制芯片MCU，由控制芯片MCU将所述亮度信息SPI传输给各个所述驱动芯片IC，并根据所述亮度信息SPI输出扫描信号为所述LED灯串提供工作电能，实现LED灯串的电流与图像亮度匹配的目的，通过矩阵式的控制方式可有效降低驱动芯片IC的数目和元器件的数目，进而简化了背光驱动的电路结构，降低成本；本实施例中所述控制芯片MCU可选择STM32系列或GD32系列的芯片，当然可以选择其它具有相同功能的控制芯片MCU，本公开对此不作限定。
实施例2
基于上述Mini-LED光源的驱动电路，本公开还相应提供一种Mini-LED光源的驱动方法，如图4所示，所述驱动方法包括如下步骤：
S100、所述控制模块将主板输出的亮度信息和扫描周期输出至所述列驱动模块，并根据所述亮度信息依据预设时序输出N个扫描信号至所述行驱动模块；
S200、所述行驱动模块根据N个所述扫描信号分别为N行所述LED灯串提供工作电能；
S300、所述列驱动模块根据所述亮度信息和扫描周期驱动M列所述LED灯串点亮。
进一步地，如图5所示，所述步骤S200包括：
S210、所述行驱动单元根据N个所述扫描信号分别为N行所述LED灯串提供工作电能；
S220、所述消隐单元在相邻两个所述扫描信号的输出间隙输出预充电能至各个所述LED灯串。
实施例3
基于上述Mini-LED光源的驱动电路，本公开还相应提供了一种Mini-LED光源，包括如上所述的Mini-LED光源的驱动电路、PCB板和灯板，其中，所述Mini-LED光源的驱动电路中的所述控制模块、所述行驱动模块和所述列驱动模块均设置在上所述PCB板上，所述LED阵列设置在所述灯板上，且所述PCB板和所述灯板是相互独立的，实现了将所述LED灯板与所述驱动电路分离设置，在实际应用中，所述主板和所述PCB板等共同安装于整机背板上，通过线材与所述LED灯板连接，由此通过将LED灯板与所述驱动电路分离设置，有利于整机及模组的售后维修。
综上所述，本公开提供的一种Mini-LED光源及其驱动电路和驱动方法，所述驱动电路包括LED阵列、行驱动模块、列驱动模块和控制模块，所述LED阵列包括M行LED灯串和N列LED灯串，N和M均为正整数；所述控制模块将主板输出的亮度信息和扫描周期输出至所述列驱动模块，并根据所述亮度信息依据预设时序输出M个扫描信号至所述行驱动模块；所述行驱动模块根据M个所述扫描信号分别为M行所述LED灯串提供工作电能；所述列驱动模块根据所述亮度信息和扫描周期驱动N列所述LED灯串点亮，本公开能够有效解决现有Mini-LED光源驱动方案中元器件数目多、电路复杂、不利于批量生产和维修性差的问题。
可以理解的是，对本领域普通技术人员来说，可以根据本公开的技术方案及其公开构思加以等同替换或改变，而所有这些改变或替换都应属于本公开所附的权利要求的保护范围。

Claims (15)

  1. 一种Mini-LED光源的驱动电路，与显示设备的主板连接，其特征在于，包括LED阵列、行驱动模块、列驱动模块和控制模块，所述LED阵列包括M行LED灯串和N列LED灯串，N和M均为正整数；所述控制模块将主板输出的亮度信息和扫描周期输出至所述列驱动模块，并根据所述亮度信息依据预设时序输出M个扫描信号至所述行驱动模块；所述行驱动模块根据M个所述扫描信号分别为M行所述LED灯串提供工作电能；所述列驱动模块根据所述亮度信息和扫描周期驱动N列所述LED灯串点亮。
  2. 根据权利要求1所述的Mini-LED光源的驱动电路，其特征在于，所述列驱动模块还根据所述亮度信息输出反馈信息至所述控制模块。
  3. 根据权利要求1所述的Mini-LED光源的驱动电路，其特征在于，所述行驱动模块包括行驱动单元和消隐单元；所述行驱动单元根据M个所述扫描信号分别为M行所述LED灯串提供工作电能；所述消隐单元用于在相邻两个所述扫描信号的输出间隙输出预充电能至各个所述LED灯串。
  4. 根据权利要求2所述的Mini-LED光源的驱动电路，其特征在于，所述列驱动模块包括若干串联连接的列驱动单元，每个所述列驱动单元根据亮度信息驱动n列所述LED灯串，且末尾连接的所述列驱动单元根据所述亮度信息输出所述反馈信息至所述控制模块，n为大于1小于N的正整数。
  5. 根据权利要求3所述的Mini-LED光源的驱动电路，其特征在于，所述行驱动单元包括M个第一开关；每个所述第一开关的一端均连接供电端，每个所述第一开关的另一端均分别连接M行所述LED灯串的正极，每个所述第一开关的控制端均连接所述控制模块。
  6. 根据权利要求3所述的Mini-LED光源的驱动电路，其特征在于，所述消隐单元包括第二开关；所述第二开关的一端连接供电端，所述第二开关的另一端均连接各个所述LED灯串的负极，所述第二开关的控制端连接所述控制模块。
  7. 根据权利要求4所述的Mini-LED光源的驱动电路，其特征在于，所述列驱动单元包括驱动芯片，所述驱动芯片连接所在列的所述LED灯串的负极和所述控制模块。
  8. 根据权利要求3所述的Mini-LED光源的驱动电路，其特征在于，所述控制模 块包括控制芯片，所述控制芯片分别连接所述主板、所述行驱动单元和所述消隐单元。
  9. 根据权利要求5所述的Mini-LED光源的驱动电路,其特征在于，所述第一开关包括三极管、继电器、MOS管或传输门。
  10. 根据权利要求6所述的Mini-LED光源的驱动电路,其特征在于，所述第二开关包括三极管、继电器、MOS管或传输门。
  11. 根据权利要求7所述的Mini-LED光源的驱动电路,其特征在于，所述驱动芯片的型号为NT50582或IW7039。
  12. 根据权利要求1所述的Mini-LED光源的驱动电路,其特征在于，所述预设时序与所述扫描周期和需要输出的扫描信号的个数相关。
  13. 一种Mini-LED光源的驱动方法，其特征在于，包括如下步骤：
    控制模块将主板输出的亮度信息和扫描周期输出至列驱动模块，并根据亮度信息依据预设时序输出N个扫描信号至行驱动模块；
    行驱动模块根据N个扫描信号分别为N行LED灯串提供工作电能；
    列驱动模块根据亮度信息和扫描周期驱动M列LED灯串点亮。
  14. 根据权利要求13所述的Mini-LED光源的驱动方法，其特征在于，所述行驱动模块根据N个所述扫描信号分别为N行所述LED灯串提供工作电能的步骤包括：
    所述行驱动模块包括行驱动单元和消隐单元；所述行驱动单元根据N个所述扫描信号分别为N行所述LED灯串提供工作电能；
    所述消隐单元在相邻两个所述扫描信号的输出间隙输出预充电能至各个所述LED灯串。
  15. 一种Mini-LED光源，包括PCB板和灯板，其特征在于，还包括如权利要求1-12所述的Mini-LED光源的驱动电路，所述控制模块、所述行驱动模块和所述列驱动模块设置在所述PCB板上，所述LED阵列设置在所述灯板上。
PCT/CN2020/115252 2020-03-04 2020-09-15 一种Mini-LED光源及其驱动电路和驱动方法 WO2021174805A1 (zh)

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