WO2014079076A1 - Led调光驱动模块、背光模组及液晶显示装置 - Google Patents
Led调光驱动模块、背光模组及液晶显示装置 Download PDFInfo
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- WO2014079076A1 WO2014079076A1 PCT/CN2012/085338 CN2012085338W WO2014079076A1 WO 2014079076 A1 WO2014079076 A1 WO 2014079076A1 CN 2012085338 W CN2012085338 W CN 2012085338W WO 2014079076 A1 WO2014079076 A1 WO 2014079076A1
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- 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]
- H05B45/10—Controlling the intensity of the light
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- the invention relates to the field of LED dimming, in particular to an LED dimming driving module, a backlight module and a liquid crystal display device.
- LED Light Emitting Diode, light-emitting diodes
- FIG. 1 is a schematic circuit diagram of a prior art LED dimming driving circuit.
- the LED dimming drive circuit includes a comparator A, a current source S and a capacitor C. One end of the capacitor C is connected to the first input terminal of the comparator A, and the other end is grounded. Current source S is coupled to the first input of comparator A. The second input of comparator A inputs a threshold voltage V.
- the LED dimming drive circuit will respond to the pulse width modulation signal P.
- the current source S When the pulse width modulation signal P is at a high level, the current source S outputs a current to charge the capacitor C. When the voltage on the capacitor C climbs above the threshold voltage V, The output of comparator A outputs a high level for adjusting the brightness of the LED backlight.
- the duty ratio of the pulse width modulation signal P is small and the charging time of the capacitor C is short, the voltage on the capacitor C will not reach the threshold voltage V, and the pulse width modulation signal P passes through multiple After the high level, the voltage on the capacitor C climbs above the threshold voltage V, the comparator A outputs a high level, and the LED backlight illuminates. During the illumination of the LED backlight, the charging voltage of the capacitor C climbs to the threshold voltage V. The long time required causes the human eye to see flickering, which seriously affects the quality of the light source.
- the technical problem to be solved by the present invention is to provide an LED dimming driving module, a backlight module and a liquid crystal display device, which can avoid flickering.
- an LED dimming driving module which includes a duty ratio detecting unit, a current output unit, a comparator, and a capacitor unit.
- the first input of the comparator is connected to the capacitor unit, and the second input of the comparator is input with a preset threshold voltage.
- the current output unit is connected to the capacitor unit to charge the capacitor unit.
- the duty ratio detecting unit is configured to receive the pulse width modulation signal of the external input and detect the duty ratio of the pulse width modulation signal. When the duty ratio detecting unit detects that the duty ratio is less than a predetermined threshold, the current output unit increases the output current or the capacitor unit reduces the supplied capacitance to reduce the time when the voltage of the capacitor unit climbs to the preset threshold voltage.
- the current output unit outputs a first current when the duty ratio detecting unit detects that the duty ratio is less than a predetermined threshold, and the current output unit outputs the second current when the duty ratio detecting unit detects that the duty ratio is greater than a predetermined threshold.
- the current value of the second current is smaller than the current value of the first current.
- the capacitor unit provides a first capacitor when the duty ratio detecting unit detects that the duty ratio is less than a predetermined threshold, and the capacitor unit provides the second capacitor when the duty ratio detecting unit detects that the duty ratio is greater than a predetermined threshold.
- the capacitance of the first capacitor is less than the capacitance of the second capacitor.
- the current output unit includes a first control switch, a first current source, and a second current source, and the capacitor unit includes a first capacitor.
- the duty ratio detecting unit sends the first control signal to the first control switch when detecting that the duty ratio is less than a predetermined threshold, and sends the second control signal to the first control switch when detecting that the duty ratio is greater than a predetermined threshold.
- the first control switch includes a first end, a second end, a third end, and a fourth end, the first end is connected to the duty ratio detecting unit, and when the first end acquires the first control signal, the fourth end and the second end Connecting, when the first end acquires the second control signal, the fourth end is connected to the third end; the first current source is connected to the second end of the first control switch to output the first current; and the second current source is connected to the first control switch The third end outputs a second current; one end of the first capacitor is connected to the fourth end of the first control switch and the first input of the comparator, and the other end of the first capacitor is grounded.
- the current output unit includes a third current source, and the capacitor unit includes a second control switch, a second capacitor, and a third capacitor, wherein the duty ratio detecting unit transmits the first control signal when detecting that the duty ratio is less than a predetermined threshold Up to a second control switch, when detecting that the duty ratio is greater than a predetermined threshold, transmitting a second control signal to the second control switch;
- the second control switch includes a first end, a second end, a third end, and a fourth end, One end is connected to the duty ratio detecting unit, and when the first end acquires the first control signal, the fourth end is connected to the second end, and when the first end acquires the second control signal, the fourth end is connected to the third end;
- One end of the two capacitor is connected to the second end of the second control switch, the other end of the second capacitor is grounded, the second capacitor provides the first capacitor;
- one end of the third capacitor is connected to the third end of the second control switch, and the third capacitor is another One end is grounded, the third
- the duty ratio detecting unit, the current output unit, and the comparator are packaged in one body.
- the present invention also adopts a technical solution to provide a backlight module, which includes an LED lamp and an LED dimming driving module.
- the LED dimming driving module includes a duty ratio detecting unit, a current output unit, a comparator, and a capacitor unit.
- the first input of the comparator is connected to the capacitor unit, and the second input of the comparator is input with a preset threshold voltage.
- the current output unit is connected to the capacitor unit to charge the capacitor unit.
- the duty ratio detecting unit is configured to receive the pulse width modulation signal of the external input and detect the duty ratio of the pulse width modulation signal.
- the current output unit increases the output current or the capacitor unit reduces the supplied capacitance to reduce the time when the voltage of the capacitor unit climbs to the preset threshold voltage, the comparator The output of the output outputs a high level or a low level to adjust the brightness of the LED light.
- the current output unit outputs a first current when the duty ratio detecting unit detects that the duty ratio is less than a predetermined threshold, and the current output unit outputs the second current when the duty ratio detecting unit detects that the duty ratio is greater than a predetermined threshold.
- the current value of the second current is smaller than the current value of the first current.
- the capacitor unit provides a first capacitor when the duty ratio detecting unit detects that the duty ratio is less than a predetermined threshold, and the capacitor unit provides the second capacitor when the duty ratio detecting unit detects that the duty ratio is greater than a predetermined threshold.
- the capacitance of the first capacitor is less than the capacitance of the second capacitor.
- the current output unit includes a first control switch, a first current source, and a second current source, and the capacitor unit includes a first capacitor.
- the duty ratio detecting unit sends the first control signal to the first control switch when detecting that the duty ratio is less than a predetermined threshold, and sends the second control signal to the first control switch when detecting that the duty ratio is greater than a predetermined threshold.
- the first control switch includes a first end, a second end, a third end, and a fourth end, the first end is connected to the duty ratio detecting unit, and when the first end acquires the first control signal, the fourth end and the second end Connecting, when the first end acquires the second control signal, the fourth end is connected to the third end; the first current source is connected to the second end of the first control switch to output the first current; and the second current source is connected to the first control switch The third end outputs a second current; one end of the first capacitor is connected to the fourth end of the first control switch and the first input of the comparator, and the other end of the first capacitor is grounded.
- the current output unit includes a third current source, and the capacitor unit includes a second control switch, a second capacitor, and a third capacitor, wherein the duty ratio detecting unit transmits the first control signal when detecting that the duty ratio is less than a predetermined threshold Up to a second control switch, when detecting that the duty ratio is greater than a predetermined threshold, transmitting a second control signal to the second control switch;
- the second control switch includes a first end, a second end, a third end, and a fourth end, One end is connected to the duty ratio detecting unit, and when the first end acquires the first control signal, the fourth end is connected to the second end, and when the first end acquires the second control signal, the fourth end is connected to the third end;
- One end of the two capacitor is connected to the second end of the second control switch, the other end of the second capacitor is grounded, the second capacitor provides the first capacitor;
- one end of the third capacitor is connected to the third end of the second control switch, and the third capacitor is another One end is grounded, the third
- the duty ratio detecting unit, the current output unit, and the comparator are packaged in one body.
- a liquid crystal display device including a backlight module, and the backlight module includes an LED lamp and an LED dimming driving module.
- the LED dimming driving module includes a duty ratio detecting unit, a current output unit, a comparator, and a capacitor unit.
- the first input of the comparator is connected to the capacitor unit, and the second input of the comparator is input with a preset threshold voltage.
- the current output unit is connected to the capacitor unit to charge the capacitor unit.
- the duty ratio detecting unit is configured to receive the pulse width modulation signal of the external input and detect the duty ratio of the pulse width modulation signal.
- the current output unit increases the output current or the capacitor unit reduces the supplied capacitance to reduce the time when the voltage of the capacitor unit climbs to the preset threshold voltage, the comparator The output of the output outputs a high level or a low level to adjust the brightness of the LED light.
- the current output unit outputs a first current when the duty ratio detecting unit detects that the duty ratio is less than a predetermined threshold, and the current output unit outputs the second current when the duty ratio detecting unit detects that the duty ratio is greater than a predetermined threshold.
- the current value of the second current is smaller than the current value of the first current.
- the capacitor unit provides a first capacitor when the duty ratio detecting unit detects that the duty ratio is less than a predetermined threshold, and the capacitor unit provides the second capacitor when the duty ratio detecting unit detects that the duty ratio is greater than a predetermined threshold.
- the capacitance of the first capacitor is less than the capacitance of the second capacitor.
- the current output unit includes a first control switch, a first current source, and a second current source, and the capacitor unit includes a first capacitor.
- the duty ratio detecting unit sends the first control signal to the first control switch when detecting that the duty ratio is less than a predetermined threshold, and sends the second control signal to the first control switch when detecting that the duty ratio is greater than a predetermined threshold.
- the first control switch includes a first end, a second end, a third end, and a fourth end, the first end is connected to the duty ratio detecting unit, and when the first end acquires the first control signal, the fourth end and the second end Connecting, when the first end acquires the second control signal, the fourth end is connected to the third end; the first current source is connected to the second end of the first control switch to output the first current; and the second current source is connected to the first control switch The third end outputs a second current; one end of the first capacitor is connected to the fourth end of the first control switch and the first input of the comparator, and the other end of the first capacitor is grounded.
- the current output unit includes a third current source, and the capacitor unit includes a second control switch, a second capacitor, and a third capacitor, wherein the duty ratio detecting unit transmits the first control signal when detecting that the duty ratio is less than a predetermined threshold Up to a second control switch, when detecting that the duty ratio is greater than a predetermined threshold, transmitting a second control signal to the second control switch;
- the second control switch includes a first end, a second end, a third end, and a fourth end, One end is connected to the duty ratio detecting unit, and when the first end acquires the first control signal, the fourth end is connected to the second end, and when the first end acquires the second control signal, the fourth end is connected to the third end;
- One end of the two capacitor is connected to the second end of the second control switch, the other end of the second capacitor is grounded, the second capacitor provides the first capacitor;
- one end of the third capacitor is connected to the third end of the second control switch, and the third capacitor is another One end is grounded, the third
- the duty ratio detecting unit, the current output unit, and the comparator are packaged in one body.
- the LED dimming driving module, the backlight module and the liquid crystal display device of the invention can increase the charging rate of the capacitor unit and reduce the capacitance by increasing the current output by the current output unit or reducing the capacitance provided by the capacitor unit.
- the voltage of the unit climbs to the preset threshold voltage to avoid flicker and improve the quality of the light source.
- FIG. 1 is a circuit diagram of a prior art LED dimming drive circuit
- FIG. 2 is a circuit diagram of a first embodiment of an LED dimming driving module of the present invention
- FIG. 3 is a circuit diagram of a second embodiment of the LED dimming driving module of the present invention.
- FIG. 4 is a circuit diagram of a third embodiment of the LED dimming drive module of the present invention.
- FIG. 2 is a schematic circuit diagram of an embodiment of the LED dimming driving module of the present invention.
- the LED dimming drive module includes a duty ratio detecting unit M, a current output unit S0, a comparator B, and a capacitor unit C0.
- the first input of the comparator B is connected to the capacitor unit C0, and the second input of the comparator B is input with the preset threshold voltage VT.
- the first input terminal is a non-inverting input terminal, and the second input terminal is an inverting input terminal.
- the first input is an inverting input and the second input is a non-inverting input.
- the current output unit S0 is connected to the capacitor unit C0 to charge the capacitor unit C0.
- the duty ratio detecting unit M is for receiving the pulse width modulation signal P input from the outside and detecting the duty ratio of the pulse width modulation signal P.
- the duty ratio detecting unit M, the current output unit S0, and the comparator B are packaged in one body.
- the current output unit S0 increases the output current or the capacitor unit C0 decreases the supplied capacitance to reduce the voltage of the capacitor unit C0 from climbing to the preset threshold voltage VT. time. That is to say, in the case where the capacitance provided by the capacitor unit C0 remains unchanged, the current output unit S0 increases the output current; or in the case where the current output from the current output unit S0 remains unchanged, the capacitor unit C0 is reduced. Capacitance.
- FIG. 3 is a schematic circuit diagram of a second embodiment of the LED dimming driving module of the present invention.
- the LED dimming drive module includes a duty ratio detecting unit M1, a current output unit S20, a comparator B1, and a capacitor unit C20.
- the duty ratio detecting unit M1 and the comparator B1 of the present embodiment have the same technical features as the duty ratio detecting unit M and the comparator B of the first embodiment, and are not described herein again.
- the capacitance provided by the capacitor unit C20 of the present embodiment remains unchanged, and the current output unit S20 increases the output current.
- the current output unit S20 outputs the first current
- the current output unit S20 outputs the second a current, wherein the current value of the second current is less than the current value of the first current.
- the current output unit S20 includes a first control switch K1, a first current source S1, and a second current source S2, and the capacitor unit C20 includes a first capacitor C1.
- the duty ratio detecting unit M1 transmits the first control signal to the first control switch K1 when detecting that the duty ratio of the pulse width modulation signal P is less than a predetermined threshold, and transmits the second control when detecting that the duty ratio is greater than a predetermined threshold The signal is to the first control switch K2.
- the first control switch K1 includes a first end NC1, a second end NC2, a third end NC3, and a fourth end NC4.
- the first end NC1 is connected to the duty ratio detecting unit M1.
- the fourth end NC4 is connected to the second end NC2.
- the fourth end NC4 is connected to the third end NC3.
- the first current source S1 is connected to the second terminal NC2 of the first control switch K1 to output a first current.
- the second current source S2 is connected to the third terminal NC3 of the first control switch K1 to output a second current.
- One end of the first capacitor C1 is connected to the fourth terminal NC4 of the first control switch K1 and the first input terminal of the comparator B1, and the other end of the first capacitor C1 is grounded.
- the current output unit S0 increases the output current only during the period when the duty ratio is less than a predetermined threshold. It is known to those skilled in the art that if the output of the power supply current is increased, then at the moment of power switching, the voltage on the capacitor unit C20 will be charged by zero volts, thus making the entire LED dimming drive module approximately short-circuited, and will generate a huge Peak current, also known as surge current.
- the inrush current is typically 20-1000 times the peak operating current. It will cause a lot of trouble for power supply manufacturers and users, especially in places where high reliability and safety are required. Therefore, the industry will have strict standards for inrush current.
- the current output unit S20 of the embodiment is The first current is generated during the duty cycle less than the predetermined threshold, and the second current is generated during the duty cycle greater than the predetermined threshold, which can suppress the generation of the surge current and improve the reliability and safety of the LED dimming drive module.
- the LED dimming driving module of the embodiment can switch the first current source S1 or the second current source S2 to output different currents according to the output of the duty detecting unit M1 by setting the first control switch K1, and can quickly switch.
- the duty ratio is less than the predetermined threshold
- the first capacitor C1 is supplied with a large current
- the duty ratio is greater than the predetermined threshold
- the surge current can be suppressed and the operational reliability can be improved.
- FIG. 4 is a schematic circuit diagram of a third embodiment of the LED dimming driving module of the present invention.
- the LED dimming drive module includes a duty ratio detecting unit M2, a current output unit S30, a comparator B2, and a capacitor unit C30.
- the duty ratio detecting unit M2 and the comparator B2 of the present embodiment have the same technical features as the duty ratio detecting unit M and the comparator B of the first embodiment, and are not described herein again.
- the current outputted by the current output unit S30 of the embodiment remains unchanged, and the capacitance unit C30 reduces the supplied capacitance.
- the capacitor unit C30 provides the first capacitor, which accounts for
- the capacitor unit C30 provides a second capacitor, wherein the capacitance value of the first capacitor is smaller than the capacitance value of the second capacitor.
- the current output unit S30 includes a third current source S3, and the capacitor unit C30 includes a second control switch K2, a second capacitor C2, and a third capacitor C3.
- the duty ratio detecting unit M2 transmits the first control signal to the second control switch K2 when detecting that the duty ratio of the pulse width modulation signal P is less than a predetermined threshold, and transmits the second control when detecting that the duty ratio is greater than a predetermined threshold The signal is sent to the second control switch K2.
- the second control switch K2 includes a first end NO1, a second end NO2, a third end NO3, and a fourth end NO4.
- the first end NO1 is connected to the duty ratio detecting unit M2.
- the fourth end NO4 is connected to the second end NO2.
- the fourth end NO4 is connected to the third end NO3.
- One end of the second capacitor C2 is connected to the second terminal NO2 of the second control switch K2, the other end of the second capacitor C2 is grounded, and the second capacitor C2 provides the first capacitor.
- One end of the third capacitor C3 is connected to the third terminal NO3 of the second control switch K2, the other end of the third capacitor C3 is grounded, and the third capacitor C3 provides the second capacitor.
- the third current source S3 is connected to the fourth terminal NO4 of the second control switch K2 and the first input terminal of the comparator B2.
- the capacitance provided by the reduction only occurs when the duty ratio is less than a predetermined threshold period, and the surge current generation can also be suppressed.
- the specific implementation is similar to the current output unit S20 of the second embodiment. More details.
- the LED dimming driving module of this embodiment can provide different capacitances according to the output of the duty ratio detecting unit M2 by switching the second capacitor C2 or the third capacitor C3 by setting the second control switch K2, and can quickly perform switching in the duty
- the third current source S3 is supplied with a small capacitance, and when the duty ratio is greater than the predetermined threshold, the surge current can be suppressed, and the operational reliability is improved.
- the invention also provides a backlight module, which comprises an LED lamp and the LED dimming driving module of the foregoing embodiment.
- the output of the comparator is compared to output a high level or a low level, which is used to adjust the brightness of the LED light to achieve the purpose of dimming.
- the present invention also provides a liquid crystal display device comprising the above backlight module.
- a liquid crystal display device comprising the above backlight module.
- the LED dimming driving module, the backlight module and the liquid crystal display device of the invention can increase the charging rate of the capacitor unit, reduce the time when the voltage of the capacitor unit climbs to the preset threshold voltage, avoid flickering, and improve the light source. Quality, and by setting the first control switch or the second control switch, it is possible to suppress surge current and improve operational reliability.
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Claims (18)
- 一种LED调光驱动模块,其中,所述LED调光驱动模块包括占空比检测单元、电流输出单元、比较器和电容单元,其中:所述比较器的第一输入端连接所述电容单元,所述比较器的第二输入端输入预设门限电压;所述电流输出单元连接所述电容单元,以向所述电容单元充电;所述占空比检测单元用于接收外部输入的脉宽调制信号并检测所述脉宽调制信号的占空比;其中,所述占空比检测单元在检测到所述占空比小于预定阈值时,所述电流输出单元增大输出的电流或者所述电容单元减小提供的电容,以减少所述电容单元的电压爬升到所述预设门限电压的时间。
- 根据权利要求1所述的LED调光驱动模块,其中,所述占空比检测单元在检测到所述占空比小于预定阈值时,所述电流输出单元输出第一电流,所述占空比检测单元在检测到所述占空比大于所述预定阈值时,所述电流输出单元输出第二电流,其中,所述第二电流的电流值小于所述第一电流的电流值。
- 根据权利要求1所述的LED调光驱动模块,其中,所述占空比检测单元在检测到所述占空比小于所述预定阈值时,所述电容单元提供第一电容,所述占空比检测单元在检测到所述占空比大于所述预定阈值时,所述电容单元提供第二电容,其中,所述第一电容的电容值小于所述第二电容的电容值。
- 根据权利要求2所述的LED调光驱动模块,其中,所述电流输出单元包括第一控制开关、第一电流源和第二电流源,所述电容单元包括第一电容器,其中:所述占空比检测单元在检测到所述占空比小于所述预定阈值时,发送第一控制信号至所述第一控制开关,在检测到所述占空比大于所述预定阈值时,发送第二控制信号至所述第一控制开关;所述第一控制开关包括第一端、第二端、第三端和第四端,所述第一端连接所述占空比检测单元,在所述第一端获取所述第一控制信号时,所述第四端与所述第二端连接,在所述第一端获取所述第二控制信号时,所述第四端与所述第三端连接;所述第一电流源连接所述第一控制开关的第二端,输出所述第一电流;所述第二电流源连接所述第一控制开关的第三端,输出所述第二电流;所述第一电容器的一端连接所述第一控制开关的第四端以及所述比较器的第一输入端,所述第一电容器的另一端接地。
- 根据权利要求3所述的LED调光驱动模块,其中,所述电流输出单元包括第三电流源,所述电容单元包括第二控制开关、第二电容器和第三电容器,其中:所述占空比检测单元在检测到所述占空比小于所述预定阈值时,发送第一控制信号至所述第二控制开关,在检测到所述占空比大于所述预定阈值时,发送第二控制信号至所述第二控制开关;所述第二控制开关包括第一端、第二端、第三端和第四端,所述第一端连接所述占空比检测单元,在所述第一端获取所述第一控制信号时,所述第四端与所述第二端连接,在所述第一端获取所述第二控制信号时,所述第四端与所述第三端连接;所述第二电容器的一端连接所述第二控制开关的第二端,所述第二电容器的另一端接地,所述第二电容器提供所述第一电容;所述第三电容器的一端连接所述第二控制开关的第三端,所述第三电容器的另一端接地,所述第三电容器提供所述第二电容;所述第三电流源连接所述第二控制开关的第四端以及所述比较器的第一输入端。
- 根据权利要求1所述的LED调光驱动模块,其中,所述占空比检测单元、所述电流输出单元以及所述比较器封装于一体。
- 一种背光模组,其中,所述背光模组包括LED灯和LED调光驱动模块,所述LED调光驱动模块包括占空比检测单元、电流输出单元、比较器和电容单元,其中:所述比较器的第一输入端连接所述电容单元,所述比较器的第二输入端输入预设门限电压;所述电流输出单元连接所述电容单元,以向所述电容单元充电;所述占空比检测单元用于接收外部输入的脉宽调制信号并检测所述脉宽调制信号的占空比;其中,所述占空比检测单元在检测到所述占空比小于预定阈值时,所述电流输出单元增大输出的电流或者所述电容单元减小提供的电容,以减少所述电容单元的电压爬升到所述预设门限电压的时间,所述比较器的输出端输出高电平或低电平,用于调节所述LED灯的亮度。
- 根据权利要求7所述的背光模组,其中,所述占空比检测单元在检测到所述占空比小于预定阈值时,所述电流输出单元输出第一电流,所述占空比检测单元在检测到所述占空比大于所述预定阈值时,所述电流输出单元输出第二电流,其中,所述第二电流的电流值小于所述第一电流的电流值。
- 根据权利要求7所述的背光模组,其中,所述占空比检测单元在检测到所述占空比小于所述预定阈值时,所述电容单元提供第一电容,所述占空比检测单元在检测到所述占空比大于所述预定阈值时,所述电容单元提供第二电容,其中,所述第一电容的电容值小于所述第二电容的电容值。
- 根据权利要求8所述的背光模组,其中,所述电流输出单元包括第一控制开关、第一电流源和第二电流源,所述电容单元包括第一电容器,其中:所述占空比检测单元在检测到所述占空比小于所述预定阈值时,发送第一控制信号至所述第一控制开关,在检测到所述占空比大于所述预定阈值时,发送第二控制信号至所述第一控制开关;所述第一控制开关包括第一端、第二端、第三端和第四端,所述第一端连接所述占空比检测单元,在所述第一端获取所述第一控制信号时,所述第四端与所述第二端连接,在所述第一端获取所述第二控制信号时,所述第四端与所述第三端连接;所述第一电流源连接所述第一控制开关的第二端,输出所述第一电流;所述第二电流源连接所述第一控制开关的第三端,输出所述第二电流;所述第一电容器的一端连接所述第一控制开关的第四端以及所述比较器的第一输入端,所述第一电容器的另一端接地。
- 根据权利要求9所述的背光模组,其中,所述电流输出单元包括第三电流源,所述电容单元包括第二控制开关、第二电容器和第三电容器,其中:所述占空比检测单元在检测到所述占空比小于所述预定阈值时,发送第一控制信号至所述第二控制开关,在检测到所述占空比大于所述预定阈值时,发送第二控制信号至所述第二控制开关;所述第二控制开关包括第一端、第二端、第三端和第四端,所述第一端连接所述占空比检测单元,在所述第一端获取所述第一控制信号时,所述第四端与所述第二端连接,在所述第一端获取所述第二控制信号时,所述第四端与所述第三端连接;所述第二电容器的一端连接所述第二控制开关的第二端,所述第二电容器的另一端接地,所述第二电容器提供所述第一电容;所述第三电容器的一端连接所述第二控制开关的第三端,所述第三电容器的另一端接地,所述第三电容器提供所述第二电容;所述第三电流源连接所述第二控制开关的第四端以及所述比较器的第一输入端。
- 根据权利要求7所述的背光模组,其中,所述占空比检测单元、所述电流输出单元以及所述比较器封装于一体。
- 一种液晶显示装置,其中,所述液晶显示装置包括背光模组,背光模组包括LED灯和LED调光驱动模块,所述LED调光驱动模块包括占空比检测单元、电流输出单元、比较器和电容单元,其中:所述比较器的第一输入端连接所述电容单元,所述比较器的第二输入端输入预设门限电压;所述电流输出单元连接所述电容单元,以向所述电容单元充电;所述占空比检测单元用于接收外部输入的脉宽调制信号并检测所述脉宽调制信号的占空比;其中,所述占空比检测单元在检测到所述占空比小于预定阈值时,所述电流输出单元增大输出的电流或者所述电容单元减小提供的电容,以减少所述电容单元的电压爬升到所述预设门限电压的时间,所述比较器的输出端输出高电平或低电平,用于调节所述LED灯的亮度。
- 根据权利要求13所述的液晶显示装置,其中,所述占空比检测单元在检测到所述占空比小于预定阈值时,所述电流输出单元输出第一电流,所述占空比检测单元在检测到所述占空比大于所述预定阈值时,所述电流输出单元输出第二电流,其中,所述第二电流的电流值小于所述第一电流的电流值。
- 根据权利要求13所述的液晶显示装置,其中,所述占空比检测单元在检测到所述占空比小于所述预定阈值时,所述电容单元提供第一电容,所述占空比检测单元在检测到所述占空比大于所述预定阈值时,所述电容单元提供第二电容,其中,所述第一电容的电容值小于所述第二电容的电容值。
- 根据权利要求14所述的液晶显示装置,其中,所述电流输出单元包括第一控制开关、第一电流源和第二电流源,所述电容单元包括第一电容器,其中:所述占空比检测单元在检测到所述占空比小于所述预定阈值时,发送第一控制信号至所述第一控制开关,在检测到所述占空比大于所述预定阈值时,发送第二控制信号至所述第一控制开关;所述第一控制开关包括第一端、第二端、第三端和第四端,所述第一端连接所述占空比检测单元,在所述第一端获取所述第一控制信号时,所述第四端与所述第二端连接,在所述第一端获取所述第二控制信号时,所述第四端与所述第三端连接;所述第一电流源连接所述第一控制开关的第二端,输出所述第一电流;所述第二电流源连接所述第一控制开关的第三端,输出所述第二电流;所述第一电容器的一端连接所述第一控制开关的第四端以及所述比较器的第一输入端,所述第一电容器的另一端接地。
- 根据权利要求15所述的液晶显示装置,其中,所述电流输出单元包括第三电流源,所述电容单元包括第二控制开关、第二电容器和第三电容器,其中:所述占空比检测单元在检测到所述占空比小于所述预定阈值时,发送第一控制信号至所述第二控制开关,在检测到所述占空比大于所述预定阈值时,发送第二控制信号至所述第二控制开关;所述第二控制开关包括第一端、第二端、第三端和第四端,所述第一端连接所述占空比检测单元,在所述第一端获取所述第一控制信号时,所述第四端与所述第二端连接,在所述第一端获取所述第二控制信号时,所述第四端与所述第三端连接;所述第二电容器的一端连接所述第二控制开关的第二端,所述第二电容器的另一端接地,所述第二电容器提供所述第一电容;所述第三电容器的一端连接所述第二控制开关的第三端,所述第三电容器的另一端接地,所述第三电容器提供所述第二电容;所述第三电流源连接所述第二控制开关的第四端以及所述比较器的第一输入端。
- 根据权利要求13所述的液晶显示装置,其中,所述占空比检测单元、所述电流输出单元以及所述比较器封装于一体。
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| US13/701,868 US8957589B2 (en) | 2012-11-21 | 2012-11-27 | LED light-adjustment driver module, backlight module and liquid crystal display device |
| DE112012007036.4T DE112012007036B4 (de) | 2012-11-21 | 2012-11-27 | LED-Lichteinstellungstreibermodul, Hintergrundbeleuchtungsmodul und Flüssigkristallanzeigevorrichtung |
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| CN201210475568.XA CN102984860B (zh) | 2012-11-21 | 2012-11-21 | Led调光驱动模块、背光模组及液晶显示装置 |
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| CN103440848B (zh) * | 2013-09-02 | 2016-01-20 | 深圳市华星光电技术有限公司 | 背光驱动电路 |
| CN105448233B (zh) * | 2014-08-26 | 2018-06-26 | 上海和辉光电有限公司 | Oled像素的驱动方法及有机发光二极管显示装置 |
| CN104299603B (zh) * | 2014-10-24 | 2018-03-27 | 京东方科技集团股份有限公司 | 亮度调节装置、方法、led背光装置和液晶显示装置 |
| TW201640955A (zh) * | 2015-05-07 | 2016-11-16 | Advanced Analog Technology Inc | 可提升面板調光效能的控制裝置及方法 |
| CN107146582B (zh) * | 2017-06-14 | 2019-09-13 | 昆山龙腾光电有限公司 | 背光驱动器及其驱动方法 |
| CN108564924B (zh) * | 2018-03-22 | 2021-06-29 | 昆山龙腾光电股份有限公司 | 背光调节电路及背光调节方法 |
| CN116560145A (zh) * | 2023-05-30 | 2023-08-08 | 中国银行股份有限公司 | 一种检测装置、检测方法、电子设备及存储介质 |
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| CN102083254A (zh) * | 2009-11-30 | 2011-06-01 | 成都芯源系统有限公司 | 适用于三端可控硅调光器的wled驱动电路及驱动方法 |
| CN102708804A (zh) * | 2011-10-21 | 2012-10-03 | 京东方科技集团股份有限公司 | 背光的调光方法及背光驱动电路 |
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| KR20080086798A (ko) * | 2007-03-23 | 2008-09-26 | 파워 인티그레이션즈, 인크. | 고전압 전력 공급 회로용 방법 및 장치 |
| CN102271442B (zh) * | 2010-06-01 | 2014-07-02 | 登丰微电子股份有限公司 | 发光二极管驱动电路及控制电路 |
| DE102010039827B4 (de) * | 2010-08-26 | 2018-05-09 | Osram Gmbh | Verfahren zum Betreiben mindestens einer Leuchtdiode und Leuchtvorrichtung zum Durchführen des Verfahrens |
| TWI425874B (zh) * | 2010-12-23 | 2014-02-01 | Leadtrend Tech Corp | 積體電路、控制方法、與光源提供系統 |
| JP5735825B2 (ja) * | 2011-03-08 | 2015-06-17 | ローム株式会社 | 発光素子駆動用のスイッチング電源の制御回路およびそれらを用いた発光装置および電子機器 |
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| CN101605417A (zh) * | 2009-07-15 | 2009-12-16 | 西安英洛华微电子有限公司 | 带调光的led恒流驱动电路 |
| CN102083254A (zh) * | 2009-11-30 | 2011-06-01 | 成都芯源系统有限公司 | 适用于三端可控硅调光器的wled驱动电路及驱动方法 |
| CN102708804A (zh) * | 2011-10-21 | 2012-10-03 | 京东方科技集团股份有限公司 | 背光的调光方法及背光驱动电路 |
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| DE112012007036B4 (de) | 2019-11-21 |
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