WO2020024344A1 - 背光驱动控制方法及系统 - Google Patents

背光驱动控制方法及系统 Download PDF

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Publication number
WO2020024344A1
WO2020024344A1 PCT/CN2018/101781 CN2018101781W WO2020024344A1 WO 2020024344 A1 WO2020024344 A1 WO 2020024344A1 CN 2018101781 W CN2018101781 W CN 2018101781W WO 2020024344 A1 WO2020024344 A1 WO 2020024344A1
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WIPO (PCT)
Prior art keywords
width modulation
pulse width
modulation signal
led light
control
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PCT/CN2018/101781
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English (en)
French (fr)
Inventor
张先明
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Priority to US16/306,586 priority Critical patent/US10854148B2/en
Publication of WO2020024344A1 publication Critical patent/WO2020024344A1/zh
Anticipated expiration legal-status Critical
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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
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • 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
    • G09G3/36—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 using liquid crystals
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention relates to the technical field of backlight control, in particular to a backlight driving control method and system.
  • liquid crystal display has become an important display tool, and dynamic backlight technology is widely used in liquid crystal display.
  • the LCD screen needs to use dynamic backlight control technology to drive the backlight source, so that the backlight source displays images.
  • FIG. 1 is a structural diagram of a conventional backlight driving system.
  • the backlight driving system 100 includes a main control system 10, a backlight control module 20, a voltage conversion module 30, and a plurality of LED light strings 40.
  • each channel LED light string
  • the voltage conversion module When each channel (LED light string) receives a pulse width modulation signal, the voltage conversion module is in a working state, and the driving circuit of the backlight driving system is in CCM (Continous Conduction Mode, continuous conduction mode); and when the voltage conversion module is in When in a non-working state, the driving circuit of the backlight driving system is in DCM (Discontinous Conducion Mode); that is, in these two states, the inductor current in the voltage conversion module will change to a certain extent;
  • the change value of the inductor current of a single channel is I. In this solution, the change value of the inductor current is 0 ⁇ 4I;
  • the change value of the inductor current is 0 ⁇ I; when there are two channels working, the change value of the inductor current is I ⁇ 2I; when there are three channels working, the inductance current The change value is 2I ⁇ 3I; when there are four channels working, the change value of the inductor current is 3I ⁇ 4I; and in practical applications, the number of channels in the backlight drive system is very large, which causes the inductor current value Very big.
  • the invention provides a backlight driving control method and system to improve technical problems such as interference of electromagnetic fields to circuits and noise in the existing backlight driving system.
  • the present invention provides a backlight driving control method for controlling the lighting of a plurality of LED light strings arranged in parallel, wherein the backlight driving control method includes:
  • the period of each of the pulse width modulation signals is the same and has a preset phase difference.
  • the backlight driving system includes N channels, each of which corresponds to a group of the LED light strings, wherein a corresponding pulse width modulation is output according to the initial pulse width modulation signal Signal, the pulse width modulation signal is used to control the corresponding LED light string to emit light, including steps:
  • phase difference between the i-th pulse width modulation signal and the j-th pulse width modulation signal is (j-i) * T / N, 1 ⁇ i ⁇ j ⁇ N, and i, j, and N are positive integers.
  • the phase difference between the first pulse width modulation signal and the initial pulse width modulation signal is zero.
  • the backlight driving system includes a first LED light string, a second LED light string, a third LED light string, and a fourth LED light string,
  • a fourth pulse width modulation signal is output according to the initial pulse width modulation signal to control the fourth LED light string to emit light.
  • the backlight driving control method of the present invention further includes steps:
  • the backlight driving voltage corresponding to each group of the LED light strings is adjusted according to the sampling data.
  • the present invention also provides a backlight driving system, wherein the backlight driving system includes a main control system and a backlight control module;
  • the main control system is configured to output an initial pulse width modulation signal and transmit it to the backlight control module;
  • the backlight control module is configured to output a corresponding pulse width modulation signal according to the initial pulse width modulation signal to drive a corresponding LED light string to emit light
  • the period of each of the pulse width modulation signals is the same and has a preset phase difference.
  • the backlight driving system further includes a voltage conversion module and a power source;
  • the voltage conversion module is configured to receive an output voltage of the power supply and a voltage modulation signal of the backlight control module, and convert the output voltage of the power supply into a driving voltage for driving the LED light string according to the voltage modulation signal. Backlight driving voltage.
  • the backlight driving system includes N channels, each of which corresponds to a group of the LED light strings, wherein the backlight control module includes a first LED driving unit and a second LED driving. unit;
  • phase difference between the i-th pulse width modulation signal and the j-th pulse width modulation signal is (j-i) * T / N, 1 ⁇ i ⁇ j ⁇ N, and i, j, and N are positive integers.
  • the first LED driving unit outputs a first pulse width modulation signal according to the initial pulse width modulation signal to control a group of the LED light strings to emit light;
  • the phase difference between the first pulse width modulation signal and the initial pulse width modulation signal is zero.
  • the backlight driving system further includes a sampling module
  • the sampling module is configured to collect a current value of each group of the LED light strings and output sampling data.
  • the invention also provides a backlight driving control method for controlling the lighting of a plurality of LED light strings arranged in parallel in a backlight driving system.
  • the backlight driving system includes N channels, each of which corresponds to a group of the channels.
  • the LED light string, wherein the backlight driving control method includes:
  • the period of each of the pulse width modulation signals is the same, and the phase difference between the i-th pulse width modulation signal and the j-th pulse width modulation signal is (ji) * T / N, 1 ⁇ i ⁇ j ⁇ N , I, j, and N are positive integers.
  • the phase difference between the first pulse width modulation signal and the initial pulse width modulation signal is zero.
  • the backlight driving system includes a first LED light string, a second LED light string, a third LED light string, and a fourth LED light string, wherein:
  • a fourth pulse width modulation signal is output according to the initial pulse width modulation signal to control the fourth LED light string to emit light.
  • the backlight driving control method of the present invention further includes steps:
  • the backlight driving voltage corresponding to each group of the LED light strings is adjusted according to the sampling data.
  • the LED lights in each channel are illuminated in time sharing, which avoids drastic changes in the current in the backlight driving system and improves the backlight driving.
  • the electromagnetic field in the system interferes with the circuit and reduces the noise of the backlight drive system.
  • FIG. 1 is a structural diagram of a conventional backlight driving system
  • FIG. 2 is a timing diagram of the PWM signal output by the backlight control module in FIG. 1;
  • FIG. 3 is a schematic flowchart of a backlight driving control method according to the present invention.
  • FIG. 4 is a structural diagram of a backlight driving system according to the present invention.
  • FIG. 5 is a timing diagram of a pulse width modulation signal output by the backlight control module in FIG. 4;
  • FIG. 6 is another schematic flowchart of a backlight driving control method according to the present invention.
  • FIG. 3 is a schematic flowchart of a backlight driving control method according to the present invention.
  • the backlight driving control method includes:
  • Step S10 Receive an initial pulse width modulation signal.
  • Step S20 Output a corresponding pulse width modulation signal according to the initial pulse width modulation signal, where the pulse width modulation signal is used to control the corresponding LED light string to emit light;
  • a first pulse width modulation signal is output according to the initial pulse width modulation signal to control a group of the LED light strings to emit light; wherein the first pulse width modulation signal and the initial pulse width modulation signal are The phase difference of the pulse width modulated signal is zero.
  • the backlight driving system includes a main control system 10, a backlight control module 20, a voltage conversion module 30, an LED light string group 40 and a power source 60.
  • the LED light string group 40 includes a first LED light string, A second LED light string, a third LED light string, and a fourth LED light string;
  • the backlight driving system includes four channels, and each channel corresponds to one of the pulse width modulation signals.
  • the first channel receives the first pulse width modulation signal PWM1.
  • Two channels receive the second pulse width modulation signal PWM2, third channel (third LED string 403) receives the third pulse width modulation signal PWM3, and fourth channel (fourth LED string 404) Receive the fourth pulse width modulation signal PWM4; or
  • the first channel receives the fourth pulse width modulation signal PWM4, the second channel receives the third pulse width modulation signal PWM3, the third channel receives the second pulse width modulation signal PWM2, and the fourth channel receives the first pulse width modulation signal PWM1; similarly
  • the present invention is not limited to the above two corresponding solutions.
  • FIG. 5 is a timing diagram of the pulse width modulation signal output by the backlight control module in FIG. 4.
  • a first pulse width modulation signal PWM1 is output according to the initial pulse width modulation signal to control the first LED.
  • the position of the channel may not necessarily correspond to receiving the corresponding PWM signal; for example, the PWM signal of the first channel is delayed by 3/4 cycle, the PWM signal of the second channel is delayed by 0 cycle, and the third The pulse width modulation signal of the channel is delayed by 1/4 cycle, and the pulse width modulation signal of the fourth channel is delayed by 2/4 cycle, as long as the delay period of the pulse width modulation signal received by each channel is not consistent.
  • the voltage conversion module 30 when a channel receives a corresponding pulse width modulation signal, the voltage conversion module 30 generates an inductor current I, and when another channel receives a corresponding pulse width modulation signal, the voltage conversion module 30 simultaneously The inductor current I is also generated; and because the two groups of channels receive the corresponding pulse width modulated signals at different times, the generated inductor current does not overlap; the corresponding pulse width modulated signals are output for each channel according to the above, and the backlight driving system generates The inductor current is I, and the LED lights of each channel are turned on in a time-shared manner, which avoids the drastic changes in the current in the backlight drive system, improves the interference of the electromagnetic field on the circuit in the backlight drive system, and reduces the noise of the backlight drive system.
  • the method further includes steps:
  • the backlight driving system includes but is not limited to four channels (the number of channels is the same as the number of LED string lights), and each channel corresponds to a resistance module (not shown) with the same resistance value; this embodiment In the above, the resistance module is used to detect the current in each channel, that is, the area can be regarded as the sampling module 50;
  • the current in the channel is detected by the resistance module in the channel, and the sampling data in each channel is output to the backlight driving module 20.
  • the backlight driving module 20 inputs the voltage modulation to the voltage conversion module 30 according to the sampling data. Signal to adjust the backlight driving voltage output by the voltage conversion module 30 to ensure that the current of each channel is constant;
  • the backlight control module 20 when the sampled data voltage is higher than the reference voltage, the backlight control module 20 outputs a control signal to cause the voltage conversion module 30 to reduce the backlight driving voltage, thereby reducing the current in the channel; otherwise, the backlight control module 20 outputs control The signal causes the voltage conversion module 30 to increase the backlight driving voltage, thereby increasing the current in the channel.
  • the voltage conversion module 30 is, but is not limited to, a Boost boost circuit.
  • the present invention also provides a backlight driving system 100, wherein the backlight driving system 100 includes: a main control system 10, a backlight control module 20, a voltage conversion module 30, a power source 60, and an LED light string group 40;
  • the main control system 10 is configured to output an initial pulse width modulation signal and transmit it to the backlight control module 20;
  • the backlight control module 20 is configured to output a corresponding pulse width modulation signal and an output voltage of a receiving power according to the initial pulse width modulation signal PWM to drive a corresponding LED light string to emit light; as shown in FIG. 5, each The pulse width modulation signals (PWM1 to PWM4 in the figure) have the same period and have a preset phase difference.
  • the backlight driving system 100 further includes a voltage conversion module 30 and a power source 60;
  • the voltage conversion module 30 is configured to receive an output voltage of the power supply and a voltage modulation signal of the backlight control module 20, and convert the output voltage of the power supply 60 to drive the LED lamp according to the voltage modulation signal. Backlight drive voltage for string lighting.
  • the backlight driving system 100 includes N channels, each of which corresponds to a group of the LED light strings, wherein the backlight control module 20 includes a first LED driving unit and a first LED driving unit. Two LED drive units;
  • a phase difference between the i-th pulse width modulation signal and the j-th pulse width modulation signal is (ji) * T / N, 1 ⁇ i ⁇ j ⁇ N, and i, j, and N are positive integers.
  • the first LED driving unit outputs a first pulse width modulation signal PWM1 according to the initial pulse width modulation signal to control a group of the LED light strings to emit light;
  • a phase difference between a pulse width modulation signal PWM1 and the initial pulse width modulation signal is zero.
  • the position of the channel may not necessarily correspond to receiving the corresponding PWM signal; for example, the PWM signal of the first channel is delayed by 3/4 cycle, the PWM signal of the second channel is delayed by 0 cycle, and the third The pulse width modulation signal of the channel is delayed by 1/4 cycle, and the pulse width modulation signal of the fourth channel is delayed by 2/4 cycle, as long as the delay period of the pulse width modulation signal received by each channel is not consistent.
  • the backlight driving system 100 further includes a sampling module 50;
  • the sampling module 50 is configured to collect the current value of each group of the LED string lights and output sampling data; that is, to detect the magnitude of the current in the channel through the resistance module in the channel, and output the current in each channel to the backlight driving module 20.
  • the backlight driving module 20 inputs a voltage modulation signal to the voltage conversion module 30 according to the sampling data to adjust the backlight driving voltage output by the voltage conversion module 30 to ensure a constant current of each channel.
  • the invention provides a backlight driving control method and system, which include: receiving an initial pulse width modulation signal; and outputting a corresponding pulse width modulation signal according to the initial pulse width modulation signal, where the pulse width modulation signal is used to control a corresponding LED
  • the lamp string emits light, wherein each of the pulse width modulation signals has the same period and has a preset phase difference.
  • the invention sets a preset phase difference for the pulse width modulation signal received by each channel in the backlight driving system, so that the LED light strings of each channel emit light in a time-sharing manner, avoids drastic changes in the current in the backlight driving system, and improves the backlight.
  • the interference of the electromagnetic field on the circuit in the driving system reduces the noise of the backlight driving system.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

一种背光驱动控制方法及系统（100），包括：接收初始脉冲宽度调制信号（PWM）（S10）；根据初始脉冲宽度调制信号（PWM）输出相应的脉冲宽度调制信号（PWM1，PWM2，PWM3，PWM4…），脉冲宽度调制信号（PWM1，PWM2，PWM3，PWM4…）用于控制相应的LED灯串发光（S20），其中，每个脉冲宽度调制信号（PWM1，PWM2，PWM3，PWM4…）的周期相同，且具有预设相位差。

Description

背光驱动控制方法及系统 技术领域
本发明涉及背光控制技术领域，尤其涉及一种背光驱动控制方法及系统。
 背景技术
随着液晶显示技术的发展，液晶显示屏已经成为重要的显示工具，动态背光技术广泛的应用于液晶显示屏中。液晶显示屏需要采用动态背光控制技术，来驱动背光源，进而使得背光源显示图像。
图1所示为现有一种背光驱动系统的结构图，所述背光驱动系统100包括主控制系统10、背光调控模块20、电压转换模块30及多条LED灯串40；图2为图1中背光调控模块输出脉冲宽度调制信号的时序图。
当每一通道（LED灯串）接收脉冲宽度调制信号时，电压转换模块处于工作状态，所述背光驱动系统的驱动电路处于CCM（Continous Conduction Mode，连续导通模式）；而当电压转换模块处于非工作状态时，所述背光驱动系统的驱动电路处于DCM（Discontinous Conducion Mode，断续导通模式）；即在这两种状态下，电压转换模块中的电感电流会产生一定的变化；设定单一通道的电感电流变化值为I，在本方案中，电感电流的变化值为0~4I；
因此，当只有单一通道进行工作时，电感电流的变化值为0~I；当有两个通道进行工作时，电感电流的变化值为I~2I；当有三个通道进行工作时，电感电流的变化值为2I~3I；当有四个通道进行工作时，电感电流的变化值为3I~4I；而在实际应用中，背光驱动系统中的通道数量是非常多的，所引起的电感电流值非常大。
 技术问题
本发明提供一种背光驱动控制方法及系统，以改善现有背光驱动系统中电磁场对电路的干扰以及噪音等技术问题。
 技术解决方案
本发明提出了一种背光驱动控制方法，用于控制多条并联设置的LED灯串发光，其中，所述背光驱动控制方法包括：
接收初始脉冲宽度调制信号；
根据所述初始脉冲宽度调制信号输出相应的脉冲宽度调制信号，所述脉冲宽度调制信号用于控制相应的LED灯串发光，
其中，每个所述脉冲宽度调制信号的周期相同，且具有预设相位差。
在本发明的背光驱动控制方法中，所述背光驱动系统包括N个通道，每一所述通道对应一组所述LED灯串，其中，根据所述初始脉冲宽度调制信号输出相应的脉冲宽度调制信号，所述脉冲宽度调制信号用于控制相应的LED灯串发光，包括步骤：
在t=（i-1）*T/N时，根据所述初始脉冲宽度调制信号输出第i脉冲宽度调制信号，以控制一组所述LED灯串发光；
在t=（j-1）*T/N时，根据所述初始脉冲宽度调制信号输出第j脉冲宽度调制信号，以控制另一组所述LED灯串发光；
其中，所述第i脉冲宽度调制信号与所述第j脉冲宽度调制信号的相位差为（j-i）*T/N，1≤i＜j≤N，i、j和N为正整数。
在本发明的背光驱动控制方法中，在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制一组所述LED灯串发光；
其中，所述第一脉冲宽度调制信号与所述初始脉冲宽度调制信号的相位差为0。
在本发明的背光驱动控制方法中，所述背光驱动系统包括第一LED灯串、第二LED灯串、第三LED灯串及第四LED灯串，
在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制所述第一LED灯串发光；
在t= T/4时，根据所述初始脉冲宽度调制信号输出第二脉冲宽度调制信号，以控制所述第二LED灯串发光；
在t= 2T/4时，根据所述初始脉冲宽度调制信号输出第三脉冲宽度调制信号，以控制所述第三LED灯串发光；
在t= 3T/4时，根据所述初始脉冲宽度调制信号输出第四脉冲宽度调制信号，以控制所述第四LED灯串发光。
在本发明的背光驱动控制方法中，还包括步骤：
采集每一组所述LED灯串的电流值，并输出采样数据；
根据所述采样数据调节每一组所述LED灯串对应的背光驱动电压。
本发明还提出了一种背光驱动系统，其中，所述背光驱动系统包括：主控制系统、背光调控模块；
所述主控制系统用于输出初始脉冲宽度调制信号，并传输至所述背光调控模块；
所述背光调控模块用于根据所述初始脉冲宽度调制信号，输出相应的脉冲宽度调制信号，以驱动相应的LED灯串发光，
其中，每个所述脉冲宽度调制信号的周期相同，且具有预设相位差。
在本发明的背光驱动系统中，所述背光驱动系统还包括电压转换模块和电源；
所述电压转换模块用于接收所述电源的输出电压、及所述背光调控模块的电压调制信号，并根据所述电压调制信号将所述电源的输出电压转换成驱动所述LED灯串发光的背光驱动电压。
在本发明的背光驱动系统中，所述背光驱动系统包括N个通道，每一所述通道对应一组所述LED灯串，其中，所述背光调控模块第一LED驱动单元和第二LED驱动单元；
所述第一LED驱动单元用于在t=（i-1）*T/N时，根据所述初始脉冲宽度调制信号输出第i脉冲宽度调制信号，以控制一组所述LED灯串发光；
所述第二LED驱动单元用于在t=（j-1）*T/N时，根据所述初始脉冲宽度调制信号输出第j脉冲宽度调制信号，以控制另一组所述LED灯串发光；
其中，所述第i脉冲宽度调制信号与所述第j脉冲宽度调制信号的相位差为（j-i）*T/N，1≤i＜j≤N，i、j和N为正整数。
在本发明的背光驱动系统中，在t=0时，所述第一LED驱动单元根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制一组所述LED灯串发光；
其中，所述第一脉冲宽度调制信号与所述初始脉冲宽度调制信号的相位差为0。
在本发明的背光驱动系统中，所述背光驱动系统还包括采样模块；
所述采样模块用于采集每一组所述LED灯串的电流值，并输出采样数据。
本发明还提出了一种背光驱动控制方法，用于控制背光驱动系统中的多条并联设置的LED灯串发光，所述背光驱动系统包括N个通道，每一所述通道对应一组所述LED灯串，其中，所述背光驱动控制方法包括：
接收初始脉冲宽度调制信号；
在t=（i-1）*T/N时，根据所述初始脉冲宽度调制信号输出第i脉冲宽度调制信号，以控制一组所述LED灯串发光，
在t=（j-1）*T/N时，根据所述初始脉冲宽度调制信号输出第j脉冲宽度调制信号，以控制另一组所述LED灯串发光，
其中，每个所述脉冲宽度调制信号的周期相同，所述第i脉冲宽度调制信号与所述第j脉冲宽度调制信号的相位差为（j-i）*T/N，1≤i＜j≤N，i、j和N为正整数。
在本发明的背光驱动控制方法中，在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制一组所述LED灯串发光；
其中，所述第一脉冲宽度调制信号与所述初始脉冲宽度调制信号的相位差为0。
在本发明的背光驱动控制方法中，所述背光驱动系统包括第一LED灯串、第二LED灯串、第三LED灯串及第四LED灯串，其中，
在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制所述第一LED灯串发光；
在t= T/4时，根据所述初始脉冲宽度调制信号输出第二脉冲宽度调制信号，以控制所述第二LED灯串发光；
在t= 2T/4时，根据所述初始脉冲宽度调制信号输出第三脉冲宽度调制信号，以控制所述第三LED灯串发光；
在t= 3T/4时，根据所述初始脉冲宽度调制信号输出第四脉冲宽度调制信号，以控制所述第四LED灯串发光。
在本发明的背光驱动控制方法中，还包括步骤：
采集每一组所述LED灯串的电流值，并输出采样数据；
根据所述采样数据调节每一组所述LED灯串对应的背光驱动电压。
 有益效果
通过对背光驱动系统中每一通道接收到的脉冲宽度调制信号设置预设相位差，使得各通道内的LED灯串分时发光，避免了背光驱动系统中电流的激剧变化，改善了背光驱动系统中电磁场对电路的干扰，降低了背光驱动系统的噪音。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为现有一种背光驱动系统的结构图；
图2为图1中背光调控模块输出脉冲宽度调制信号的时序图；
图3为本发明一种背光驱动控制方法的流程示意图；
图4为本发明一种背光驱动系统的结构图；
图5为图4中背光调控模块输出脉冲宽度调制信号的时序图；
图6为本发明一种背光驱动控制方法的另一流程示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图示，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如[上]、[下]、[前]、[后]、[左]、[右]、[内]、[外]、[侧面]等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是用以相同标号表示。
图3所示为本发明一种背光驱动控制方法的流程示意图，其中，所述背光驱动控制方法包括：
步骤S10、接收初始脉冲宽度调制信号。
步骤S20、根据所述初始脉冲宽度调制信号输出相应的脉冲宽度调制信号，所述脉冲宽度调制信号用于控制相应的LED灯串发光；
在本发明的优选实施例中，所述背光驱动系统包括N个通道，每一所述通道对应一组所述LED灯串；在t=0时刻，所述主控至系统输出初始脉冲宽度调制信号；而在t＞0时刻，根据所述初始脉冲宽度调制信号输出相应的脉冲宽度调制信号，所述脉冲宽度调制信号用于控制相应的LED灯串发光，其中每个所述脉冲宽度调制信号的周期相同，且具有预设相位差。
可以理解的，在本发明中，在t=（i-1）*T/N时，根据所述初始脉冲宽度调制信号输出第i脉冲宽度调制信号，以控制一组所述LED灯串发光；在t=（j-1）*T/N时，根据所述初始脉冲宽度调制信号输出第j脉冲宽度调制信号，以控制另一组所述LED灯串发光；其中，所述第i脉冲宽度调制信号与所述第j脉冲宽度调制信号的相位差为（j-i）*T/N，1≤i＜j≤N，i、j和N为正整数；
进一步的，在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制一组所述LED灯串发光；其中，所述第一脉冲宽度调制信号与所述初始脉冲宽度调制信号的相位差为0。
如图4所示，所述背光驱动系统包括主控制系统10、背光调控模块20、电压转换模块30、LED灯串组40及电源60，所述LED灯串组40包括第一LED灯串、第二LED灯串、第三LED灯串及第四LED灯串；
在本实施例中，所述背光驱动系统包括4个通道，每一通道对应一所述脉冲宽度调制信号，例如第一通道（第一LED灯串401）接收第一脉冲宽度调制信号PWM1，第二通道（第二LED灯串402）接收第二脉冲宽度调制信号PWM2，第三通道（第三LED灯串403）接收第三脉冲宽度调制信号PWM3，第四通道（第四LED灯串404）接收第四脉冲宽度调制信号PWM4；或者
第一通道接收第四脉冲宽度调制信号PWM4，第二通道接收第三脉冲宽度调制信号PWM3，第三通道接收第二脉冲宽度调制信号PWM2，第四通道接收第一脉冲宽度调制信号PWM1；同理，本发明不限定于上述两种对应方案。
图5所示为图4中背光调控模块输出脉冲宽度调制信号的时序图，在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号PWM1，以控制所述第一LED灯串发光；在t= T/4时，根据所述初始脉冲宽度调制信号输出第二脉冲宽度调制信号PWM2，以控制所述第二LED灯串发光；在t= 2T/4时，根据所述初始脉冲宽度调制信号输出第三脉冲宽度调制信号PWM3，以控制所述第三LED灯串发光；在t= 3T/4时，根据所述初始脉冲宽度调制信号输出第四脉冲宽度调制信号PWM4，以控制所述第四LED灯串发光；
进一步的，通道的位置与接收相应的脉冲宽度调制信号不一定非得对应；例如，第一通道的脉冲宽度调制信号延迟3/4周期，第二通道的脉冲宽度调制信号延迟0个周期，第三通道的脉冲宽度调制信号延迟1/4周期，第四通道的脉冲宽度调制信号延迟2/4周期，只要每一通道接收到的脉冲宽度调制信号延迟的周期不一致即可。
可以理解的，当某一通道接收到对应的脉冲宽度调制信号时，所述电压转换模块30产生电感电流I，当另一通道接收到对应的脉冲宽度调制信号时，所述电压转换模块30同时也产生电感电流I；而由于两组通道接收对应的脉冲宽度调制信号的时间不一致，因此产生的电感电流不叠加；按照上述对每一通道输出对应的脉冲宽度调制信号，所述背光驱动系统产生电感电流为I，各通道的LED灯串分时打开，避免了背光驱动系统中电流的激剧变化，改善了背光驱动系统中电磁场对电路的干扰，降低了背光驱动系统的噪音。
如图6所示，在本发明的背光驱动控制方法中，还包括步骤：
S30、采集每一组所述LED灯串的电流值，并输出采样数据；
S40、根据所述采样数据调节每一组所述LED灯串对应的背光驱动电压。
在本发明的实施例中，所述背光驱动系统包括但不限于四个通道（通道数量与LED灯串数量相同），每一通道对应电阻值相等的电阻模块（未画出）；本实施例中，所述电阻模块用于检测每一通道内的电流大小，即可以把该区域看作为采样模块50；
即通过通道内的电阻模块检测通道内的电流大小，并向背光驱动模块20输出各通道内的采样数据，所述背光驱动模块20根据所述采样数据，向所述电压转换模块30输入电压调制信号，以调节所述电压转换模块30输出的背光驱动电压，以保证每一通道的电流恒定；
可以理解的，当所述采样数据电压高于参考电压时，通过背光调控模块20输出控制信号使电压转换模块30降低背光驱动电压，从而减少通道内的电流；反之，则背光调控模块20输出控制信号使电压转换模块30升高背光驱动电压，从而增加通道内的电流；优选的，所述电压转换模块30为但不限定于Boost升压电路。
如图4所示，本发明还提出了一种背光驱动系统100，其中，所述背光驱动系统100包括：主控制系统10、背光调控模块20、电压转换模块30、电源60及LED灯串组40；
所述主控制系统10用于输出初始脉冲宽度调制信号，并传输至所述背光调控模块20；
所述背光调控模块20用于根据所述初始脉冲宽度调制信号PWM，输出相应的脉冲宽度调制信号及接收电源的输出电压，以驱动相应的LED灯串发光；其中，如图5所示，每个所述脉冲宽度调制信号（图中的PWM1~PWM4）的周期相同，且具有预设相位差。
在本发明的背光驱动系统100中，所述背光驱动系统100还包括电压转换模块30和电源60；
所述电压转换模块30用于接收所述电源的输出电压、及所述背光调控模块20的电压调制信号，并根据所述电压调制信号将所述电源60的输出电压转换成驱动所述LED灯串发光的背光驱动电压。
在本发明的背光驱动系统100中，所述背光驱动系统100包括N个通道，每一所述通道对应一组所述LED灯串，其中，所述背光调控模块20第一LED驱动单元和第二LED驱动单元；
所述第一LED驱动单元用于在t=（i-1）*T/N时，根据所述初始脉冲宽度调制信号输出第i脉冲宽度调制信号，以控制一组所述LED灯串发光；所述第二LED驱动单元用于在t=（j-1）*T/N时，根据所述初始脉冲宽度调制信号输出第j脉冲宽度调制信号，以控制另一组所述LED灯串发光；其中，所述第i脉冲宽度调制信号与所述第j脉冲宽度调制信号的相位差为（j-i）*T/N，1≤i＜j≤N，i、j和N为正整数。
可以理解的，在t=0时，所述第一LED驱动单元根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号PWM1，以控制一组所述LED灯串发光；其中，所述第一脉冲宽度调制信号PWM1与所述初始脉冲宽度调制信号的相位差为0。
进一步的，所述LED灯串组40包括第一LED灯串、第二LED灯串、第三LED灯串及第四LED灯串；如图5所示，在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号PWM1，以控制所述第一LED灯串发光；在t= T/4时，根据所述初始脉冲宽度调制信号输出第二脉冲宽度调制信号PWM2，以控制所述第二LED灯串发光；在t= 2T/4时，根据所述初始脉冲宽度调制信号输出第三脉冲宽度调制信号PWM3，以控制所述第三LED灯串发光；在t= 3T/4时，根据所述初始脉冲宽度调制信号输出第四脉冲宽度调制信号PWM4，以控制所述第四LED灯串发光；
进一步的，通道的位置与接收相应的脉冲宽度调制信号不一定非得对应；例如，第一通道的脉冲宽度调制信号延迟3/4周期，第二通道的脉冲宽度调制信号延迟0个周期，第三通道的脉冲宽度调制信号延迟1/4周期，第四通道的脉冲宽度调制信号延迟2/4周期，只要每一通道接收到的脉冲宽度调制信号延迟的周期不一致即可。
在本发明的背光驱动系统100中，所述背光驱动系统100还包括采样模块50；
所述采样模块50用于采集每一组所述LED灯串的电流值，并输出采样数据；即通过通道内的电阻模块检测通道内的电流大小，并向背光驱动模块20输出各通道内的采样数据，所述背光驱动模块20根据所述采样数据，向所述电压转换模块30输入电压调制信号，以调节所述电压转换模块30输出的背光驱动电压，以保证每一通道的电流恒定。
本发明提出了一种背光驱动控制方法及系统，包括：接收初始脉冲宽度调制信号；根据所述初始脉冲宽度调制信号输出相应的脉冲宽度调制信号，所述脉冲宽度调制信号用于控制相应的LED灯串发光，其中，每个所述脉冲宽度调制信号的周期相同，且具有预设相位差。本发明通过对背光驱动系统中每一通道接收到的脉冲宽度调制信号设置预设相位差，使得各通道的LED灯串分时发光，避免了背光驱动系统中电流的激剧变化，改善了背光驱动系统中电磁场对电路的干扰，降低了背光驱动系统的噪音。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (14)

  1. 一种背光驱动控制方法，用于控制背光驱动系统中的多条并联设置的LED灯串发光，其中，所述背光驱动控制方法包括：
    接收初始脉冲宽度调制信号；
    根据所述初始脉冲宽度调制信号输出相应的脉冲宽度调制信号，所述脉冲宽度调制信号用于控制相应的LED灯串发光，
    其中，每个所述脉冲宽度调制信号的周期相同，且具有预设相位差。
  2. 根据权利要求1所述的背光驱动控制方法，所述背光驱动系统包括N个通道，每一所述通道对应一组所述LED灯串，其中，根据所述初始脉冲宽度调制信号输出相应的脉冲宽度调制信号，所述脉冲宽度调制信号用于控制相应的LED灯串发光，包括步骤：
    在t=（i-1）*T/N时，根据所述初始脉冲宽度调制信号输出第i脉冲宽度调制信号，以控制一组所述LED灯串发光；
    在t=（j-1）*T/N时，根据所述初始脉冲宽度调制信号输出第j脉冲宽度调制信号，以控制另一组所述LED灯串发光；
    其中，所述第i脉冲宽度调制信号与所述第j脉冲宽度调制信号的相位差为（j-i）*T/N，1≤i＜j≤N，i、j和N为正整数。
  3. 根据权利要求2所述的背光驱动控制方法，其中，在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制一组所述LED灯串发光；
    其中，所述第一脉冲宽度调制信号与所述初始脉冲宽度调制信号的相位差为0。
  4. 根据权利要求2所述的背光驱动控制方法，所述背光驱动系统包括第一LED灯串、第二LED灯串、第三LED灯串及第四LED灯串，其中，
    在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制所述第一LED灯串发光；
    在t= T/4时，根据所述初始脉冲宽度调制信号输出第二脉冲宽度调制信号，以控制所述第二LED灯串发光；
    在t= 2T/4时，根据所述初始脉冲宽度调制信号输出第三脉冲宽度调制信号，以控制所述第三LED灯串发光；
    在t= 3T/4时，根据所述初始脉冲宽度调制信号输出第四脉冲宽度调制信号，以控制所述第四LED灯串发光。
  5. 根据权利要求1所述的背光驱动控制方法，其中，还包括步骤：
    采集每一组所述LED灯串的电流值，并输出采样数据；
    根据所述采样数据调节每一组所述LED灯串对应的背光驱动电压。
  6. 一种背光驱动系统，其中，所述背光驱动系统包括：主控制系统、背光调控模块；
    所述主控制系统用于输出初始脉冲宽度调制信号，并传输至所述背光调控模块；
    所述背光调控模块用于根据所述初始脉冲宽度调制信号，输出相应的脉冲宽度调制信号，以驱动相应的LED灯串发光，
    其中，每个所述脉冲宽度调制信号的周期相同，且具有预设相位差。
  7. 根据权利要求6所述的背光驱动系统，其中，所述背光驱动系统还包括电压转换模块和电源；
    所述电压转换模块用于接收所述电源的输出电压、及所述背光调控模块的电压调制信号，并根据所述电压调制信号将所述电源的输出电压转换成驱动所述LED灯串发光的背光驱动电压。
  8. 根据权利要求7所述的背光驱动系统，所述背光驱动系统包括N个通道，每一所述通道对应一组所述LED灯串，其中，所述背光调控模块第一LED驱动单元和第二LED驱动单元；
    所述第一LED驱动单元用于在t=（i-1）*T/N时，根据所述初始脉冲宽度调制信号输出第i脉冲宽度调制信号，以控制一组所述LED灯串发光；
    所述第二LED驱动单元用于在t=（j-1）*T/N时，根据所述初始脉冲宽度调制信号输出第j脉冲宽度调制信号，以控制另一组所述LED灯串发光；
    其中，所述第i脉冲宽度调制信号与所述第j脉冲宽度调制信号的相位差为（j-i）*T/N，1≤i＜j≤N，i、j和N为正整数。
  9. 根据权利要求8所述的背光驱动系统，其中，在t=0时，所述第一LED驱动单元根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制一组所述LED灯串发光；
    其中，所述第一脉冲宽度调制信号与所述初始脉冲宽度调制信号的相位差为0。
  10. 根据权利要求9所述的背光驱动系统，其中，所述背光驱动系统还包括采样模块；
    所述采样模块用于采集每一组所述LED灯串的电流值，并输出采样数据。
  11. 一种背光驱动控制方法，用于控制背光驱动系统中的多条并联设置的LED灯串发光，所述背光驱动系统包括N个通道，每一所述通道对应一组所述LED灯串，其中，所述背光驱动控制方法包括：
    接收初始脉冲宽度调制信号；
    在t=（i-1）*T/N时，根据所述初始脉冲宽度调制信号输出第i脉冲宽度调制信号，以控制一组所述LED灯串发光，
    在t=（j-1）*T/N时，根据所述初始脉冲宽度调制信号输出第j脉冲宽度调制信号，以控制另一组所述LED灯串发光，
    其中，每个所述脉冲宽度调制信号的周期相同，所述第i脉冲宽度调制信号与所述第j脉冲宽度调制信号的相位差为（j-i）*T/N，1≤i＜j≤N，i、j和N为正整数。
  12. 根据权利要求11所述的背光驱动控制方法，其中，在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制一组所述LED灯串发光；
    其中，所述第一脉冲宽度调制信号与所述初始脉冲宽度调制信号的相位差为0。
  13. 根据权利要求11所述的背光驱动控制方法，所述背光驱动系统包括第一LED灯串、第二LED灯串、第三LED灯串及第四LED灯串，其中，
    在t=0时，根据所述初始脉冲宽度调制信号输出第一脉冲宽度调制信号，以控制所述第一LED灯串发光；
    在t= T/4时，根据所述初始脉冲宽度调制信号输出第二脉冲宽度调制信号，以控制所述第二LED灯串发光；
    在t= 2T/4时，根据所述初始脉冲宽度调制信号输出第三脉冲宽度调制信号，以控制所述第三LED灯串发光；
    在t= 3T/4时，根据所述初始脉冲宽度调制信号输出第四脉冲宽度调制信号，以控制所述第四LED灯串发光。
  14. 根据权利要求11所述的背光驱动控制方法，其中，还包括步骤：
    采集每一组所述LED灯串的电流值，并输出采样数据；
    根据所述采样数据调节每一组所述LED灯串对应的背光驱动电压。
PCT/CN2018/101781 2018-08-03 2018-08-22 背光驱动控制方法及系统 Ceased WO2020024344A1 (zh)

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