WO2015003459A1 - 背光源驱动电路及显示装置 - Google Patents

背光源驱动电路及显示装置 Download PDF

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Publication number
WO2015003459A1
WO2015003459A1 PCT/CN2013/089153 CN2013089153W WO2015003459A1 WO 2015003459 A1 WO2015003459 A1 WO 2015003459A1 CN 2013089153 W CN2013089153 W CN 2013089153W WO 2015003459 A1 WO2015003459 A1 WO 2015003459A1
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WO
WIPO (PCT)
Prior art keywords
resistor
circuit
capacitor
operational amplifier
field effect
Prior art date
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PCT/CN2013/089153
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English (en)
French (fr)
Inventor
张凯亮
Original Assignee
京东方科技集团股份有限公司
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Priority to US14/381,358 priority Critical patent/US9881589B2/en
Publication of WO2015003459A1 publication Critical patent/WO2015003459A1/zh

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Classifications

    • 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]
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/18—Timing circuits for raster scan displays
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • 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
    • 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 present invention relates to the field of liquid crystal display, and in particular to a backlight driving circuit and a display device. Background technique
  • the backlight is an important part of the liquid crystal display device, and its power consumption and cost occupies a large proportion in the entire liquid crystal module.
  • the power consumption consumed by the LED is converted into light, which is the source of light in the backlight, and the power consumption consumed by the driving circuit is converted into heat, which is not required by the backlight, and the generated heat pair
  • the stability of the backlight operation has an impact. To reduce the power consumption in the driver circuit, it is necessary to maximize the efficiency of the driver circuit.
  • the backlight drive circuit generally uses a switching power supply to provide a constant operating current for the LED.
  • the power consumption of the inductor and the diode accounts for a large proportion in the backlight driving circuit, and the power consumption in these devices is reduced, and more power can be supplied to the LED to improve the driving efficiency.
  • the commonly used freewheeling device is a diode. After the diode is turned on, there is a certain voltage drop, and the driving current of the entire backlight flows through the diode, so the power consumption on the diode is large.
  • the technical problem to be solved by the present invention is how to provide a backlight driving circuit and a display device, which can reduce the power consumption consumed in the driving circuit and improve the efficiency of the driving circuit.
  • a method of the present invention provides a backlight driving circuit, including a switch field effect transistor, a freewheeling field effect transistor, a power supply module, a control module, an LED group, and a feedback module, where the power supply module is used.
  • the LED group is powered
  • the control module is configured to control the conduction time of the switch FET and the freewheel FET
  • the feedback module is configured to provide a feedback voltage to the control module.
  • the power supply module includes a first inductor and a DC power source, the first inductor is connected to the DC power source at one end, and the switch FET and the freewheeling FET are connected to the other end.
  • the drain connection is not limited to, but not limited to, but not limited to, but not limited to, but not limited to, but not limited to,
  • control module includes a first operational amplifier, a voltage follower circuit, an inverter circuit, and a sawtooth circuit;
  • a source of the switching FET is grounded, a gate is connected to an output of the voltage follower circuit, a source of the freewheeling effect transistor is connected to an input end of the LED group, and a gate is An output of the inverter circuit is connected, an input of the voltage follower circuit and an input of the inverter circuit are connected to an output of the first operational amplifier, and an inverting input of the first operational amplifier Connected to the output of the sawtooth circuit, the positive input is connected to the output of the LED group.
  • the feedback module includes a first resistor, and one end of the first resistor is connected to an output end of the LED group and a forward input end of the first operational amplifier, and the other end is grounded.
  • the backlight driving circuit further includes: a first capacitor, one end of the first capacitor is connected to an input end of the LED group and a source of a freewheeling field effect transistor, and the other end is grounded.
  • the freewheeling FET turn-on voltage is 0. 2V.
  • the sawtooth wave circuit comprises: a time base integrated circuit, a second capacitor, a third capacitor, a fourth capacitor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, and a third Field effect transistor
  • the first pin of the time base integrated circuit is grounded, the fourth pin and the eighth pin are connected to the power source, the third pin is vacant, and the seventh pin is connected to the third resistor, the fourth resistor and the fifth resistor One end, the second pin and the sixth pin are connected to the other end of the fourth resistor, the fifth pin is connected to one end of the second capacitor, and the other end of the second capacitor is grounded, the fourth resistor The other end of the third capacitor is connected to one end of the third capacitor, and the other end of the third resistor is connected to one end of the second resistor and the fourth capacitor.
  • the time base integrated circuit is an NE555 time base integrated circuit.
  • the voltage follower circuit includes: a second operational amplifier, a fifth capacitor, a sixth capacitor, and a seventh resistor;
  • An output end of the second operational amplifier is an output end of the voltage follower circuit, a forward input end is an input end of the voltage follower circuit, and an output end of the second operational amplifier is connected to an inverting input end
  • One end of the sixth capacitor is connected to an output end of the second operational amplifier, and the other end is connected to one end of the fifth capacitor and one end of the seventh resistor, and the other end of the fifth capacitor is The power terminal of the second operational amplifier is connected, and the other end of the seventh resistor is grounded.
  • the inverter circuit includes: a third operational amplifier, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor;
  • One end of the eighth resistor is an input end of the inverter circuit, the other end is connected to one end of the ninth resistor and the tenth resistor, and the other end of the ninth resistor is connected to the third operational amplifier
  • the output end is connected, the other end of the tenth resistor is connected to the inverting input end of the third operational amplifier, one end of the eleventh resistor is grounded, and the other end is connected to the positive input terminal of the third operational amplifier Connected, the output of the third operational amplifier is the output of the inverter circuit.
  • Another aspect of the present invention also provides a display device including the backlight drive circuit.
  • the backlight driving circuit and the display device of the present invention adopt a field effect transistor as a freewheel in the backlight driving circuit, and use a corresponding control signal to the FET
  • the switch is controlled to effectively reduce the power consumption consumed in the driving circuit and improve the efficiency of the driving circuit.
  • FIG. 1 is a circuit connection diagram of a backlight driving circuit according to an embodiment of the present invention.
  • FIG. 2 is a waveform diagram of a sawtooth wave of a backlight driving circuit according to an embodiment of the present invention
  • FIG. 3 is a waveform diagram of output of a voltage follower circuit and an inverter circuit of a backlight driving circuit according to an embodiment of the present invention
  • 4 is a connection diagram of a sawtooth wave circuit of a backlight driving circuit according to an embodiment of the present invention
  • 5 is a circuit diagram of a voltage follower circuit of a backlight driving circuit according to an embodiment of the present invention
  • FIG. 6 is a circuit circuit connection diagram of an inverter of a backlight driving circuit according to an embodiment of the present invention. detailed description
  • a backlight driving circuit including a switching field effect transistor, a freewheeling field effect transistor, a power supply module, a control module, An LED group and a feedback module, wherein the power supply module is configured to supply power to the LED group, and the control module is configured to control the switch FET and the freewheeling FET to make their conduction time reverse, and the feedback module uses Provide feedback voltage to the control module.
  • the power supply module may include a first inductor and a DC power source, the first inductor is connected to the DC power source, and the other end is connected to the switch FET and the freewheeling field effect transistor.
  • the drain connection connects the LED group through the DC power source and the first inductor.
  • control module may include a first operational amplifier, a voltage follower circuit, an inverter circuit, and a sawtooth circuit;
  • a source of the switching FET is grounded, a gate is connected to an output of the voltage follower circuit, a source of the freewheeling effect transistor is connected to an input end of the LED group, and a gate is An output of the inverter circuit is connected, an input of the voltage follower circuit and an input of the inverter circuit are connected to an output of the first operational amplifier, and an inverting input of the first operational amplifier Connected to the output of the sawtooth circuit, the positive input is connected to the output of the LED group.
  • the feedback module may include a first resistor, one end of the first resistor being connected to the output of the LED group and the forward input of the first operational amplifier, and the other end being grounded.
  • the backlight driving circuit may further include: a first capacitor, one end of the first capacitor is connected to an input end of the LED group and a source of a freewheeling field effect transistor Connect, the other end is grounded.
  • the freewheeling field effect transistor is energized to a voltage of 0.2 V.
  • the power supply module may further be composed of a DC power supply and a plurality of inductors in series, and the ends of the plurality of series connected inductors and the switch FET and the freewheeling field effect transistor The drain connection;
  • the feedback module can also be composed of a plurality of resistors in series;
  • the control module can also be composed of a first operational amplifier, an inverter circuit and a sawtooth circuit, that is, the voltage follower circuit is omitted, and the switching field effect transistor is directly
  • the gate is connected to the output of the first operational amplifier.
  • the structure of the power supply module, the control module, and the feedback module can be modified and set as needed by those skilled in the art.
  • FIG. 1 shows a backlight driving circuit such as the embodiment of the present invention.
  • the backlight driving circuit includes: a switching field effect transistor Q1, a freewheeling field effect transistor Q2, a first inductor L1, an LED group 2, a first resistor R1, a first operational amplifier A1, a voltage follower circuit, and an inverter circuit. And sawtooth circuits.
  • One end of the first inductor L1 is connected to the DC power source VIN, and the other end is connected to the drain of the switching field effect transistor Q 1 and the freewheeling field effect transistor Q 2 , and the source of the switching field effect transistor Q 1 is grounded.
  • a gate is connected to an output end of the voltage follower circuit
  • a source of the freewheeling effect transistor Q2 is connected to an input end of the LED group Z
  • a gate is connected to an output end of the inverter circuit
  • An input end of the voltage follower circuit and an input end of the inverter circuit are connected to an output end of the first operational amplifier A1, an inverting input end of the first operational amplifier A1 and the sawtooth wave circuit
  • the output terminal is connected, the positive input terminal is connected to the output end of the LED group Z, and one end of the first resistor R1 is connected to the output end of the LED group Z and the forward input end of the first operational amplifier A1, One end is grounded.
  • the sawtooth wave circuit is configured to generate a sawtooth waveform with a certain amplitude and a certain frequency;
  • the voltage follower circuit is configured to generate a voltage follower circuit by using an operational amplifier, and the input voltage value can be completely output;
  • the inverter circuit is configured to generate a voltage inversion circuit using an operational amplifier, and the input voltage value can be output in reverse.
  • a voltage drop is generated on the first resistor.
  • a sawtooth waveform having a certain amplitude and a certain frequency generated by the sawtooth wave circuit is input to the first operational amplifier A1 in conjunction with the feedback voltage, and is subjected to operation processing via the first operational amplifier A1, thereby outputting the control signal, and the voltage is passed.
  • the follower circuit completely outputs the input control signal to control the switch FET; the inverter control circuit reversely outputs the input control signal to control the freewheeling FET.
  • the DC power supply charges the first inductor L1.
  • the switch FET Q1 After reaching a certain time, the switch FET Q1 is turned off, the freewheeling effect transistor Q2 is turned on, and the first inductor L1 passes through the freewheeling field.
  • the effect transistor Q2 delivers electrical energy to the LED group Z, thereby providing a stable output for the LED group Z.
  • the control signal outputted by the first operational amplifier A1 is transmitted to the switch FET Q1 and the freewheel FET Q2 to control the switch of the FET. Since the on-time of the switching FET Q 1 and the freewheeling effect transistor Q2 are opposite, that is, when the switching FET Q1 is turned on, the freewheeling effect transistor Q2 is turned off; when the switching FET Q1 is turned off, the freewheeling The FET Q2 is turned on, so it is necessary to make the control signals of the two FETs opposite in phase.
  • an inverter circuit is used to invert the signal output from the first operational amplifier, and then loaded to the gate of the freewheeling effect transistor Q2.
  • the sawtooth waveform generated by the sawtooth wave circuit is as shown in FIG. 2, the upper half of which is a sawtooth waveform, and the lower half is a corresponding square wave waveform after processing, and the square wave waveform and feedback after processing are processed.
  • the voltages are commonly input to the first operational amplifier A1, and are subjected to arithmetic processing via the first operational amplifier A1 to output a control signal.
  • the input control signal is completely output through the voltage follower circuit, and the reverse control signal is output through the inverter circuit.
  • the upper part of the figure outputs the complete control signal for the voltage follower circuit
  • the lower part is the reverse control signal output by the inverter circuit.
  • the upper part and the lower part are shown.
  • the signal waveform of the half output is reversed. Since the signal outputted by the voltage follower circuit controls the switching FET Q1, the control signal outputted by the inverter circuit controls the freewheeling effect transistor Q2, so the conduction time of the switching FET Q1 and the freewheeling FET Q2 is opposite. That is: when the switch FET Q1 is turned on, the freewheeling effect transistor Q2 is turned off; when the switch FET Q1 is turned off, the freewheeling FET Q2 is turned on.
  • the DC power supply charges the first inductor, and during the turn-off of the switch FET Q1, the freewheeling FET Q2 is turned on.
  • the first inductor delivers electrical energy to the LED group Z through the freewheeling effect transistor Q2, thereby providing a stable output for the LED group Z.
  • the duty ratio of the output waveform of the first operational amplifier A1 determines the charging time of the first inductor L1, thereby determining the level of the output voltage of the driving circuit.
  • the duty cycle is adjusted according to the feedback voltage. If the current on the output LED group Z increases, the current on the first resistor R1 increases, the feedback voltage increases, the duty ratio of the output of the first operational amplifier A1 decreases, and the output voltage of the driving circuit decreases; for example, the output LED group Z When the upper current decreases, the current on the first resistor R1 decreases, the feedback voltage decreases, the duty ratio of the output square wave of the first operational amplifier A1 increases, and the output voltage increases.
  • the backlight driving circuit further includes: a first capacitor C1, configured to reduce a fluctuation of a voltage that the DC power source outputs to the LED group Z via the first inductor L1, one end of the first capacitor and the LED The input of the group is connected to the source of the freewheeling FET and the other end is grounded.
  • a first capacitor C1 configured to reduce a fluctuation of a voltage that the DC power source outputs to the LED group Z via the first inductor L1, one end of the first capacitor and the LED The input of the group is connected to the source of the freewheeling FET and the other end is grounded.
  • the turn-on voltage of the freewheeling field effect transistor is 0. 2V.
  • the freewheeling device In the conventional switching circuit, the freewheeling device generally uses a diode, and the diode conduction voltage drop is about 0.5 V.
  • the product of the load current and the conduction voltage drop is the power consumption of the diode, and the conduction voltage drop of the field effect transistor is 0. 2V, under the same load current, its power consumption is reduced by more than 50%.
  • Fig. 4 is a view showing a sawtooth circuit circuit connection diagram of a backlight driving circuit of an embodiment of the present invention.
  • the sawtooth wave circuit may include: a time base integrated circuit S, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a second resistor R2. a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a third field effect transistor Q3;
  • the first pin of the time base integrated circuit S is grounded, the fourth pin and the eighth pin are connected to the power source VCC, the third pin is vacant, and the seventh pin is connected to the third resistor R3 and the fourth resistor R4.
  • the fifth pin is connected to one end of the second capacitor C2, the second capacitor C2
  • the other end of the third resistor R4 is connected to one end of the third capacitor C3, the other end of the third capacitor C3 is grounded, and the other end of the third resistor R3 is
  • the second resistor R2 is connected to one end of the fourth capacitor C4, and the other end of the second resistor R2 is connected to the power source VCC and connected to one end of the fourth pin and the eighth pin connected to the power source
  • the fifth The other end of the resistor R5 is connected to the gate of the third field effect transistor Q3, the drain of the third field effect transistor Q3 is connected to the power source VCC, and the source and the other end
  • the time base integrated circuit is a NE555 time base integrated circuit.
  • Fig. 5 is a circuit diagram showing the voltage follower circuit of the backlight drive circuit of the embodiment of the present invention.
  • the voltage follower circuit may include: a second operational amplifier A2, a fifth capacitor C5, a sixth capacitor C6, and a seventh resistor R7;
  • An output end of the second operational amplifier A2 is an output end of the voltage follower circuit, a positive input end is an input end of the voltage follower circuit, and an output end of the second operational amplifier A2 and an inverting input
  • One end of the sixth capacitor C6 is connected to the output end of the second operational amplifier A2, and the other end is connected to one end of the fifth capacitor C5 and one end of the seventh resistor R7.
  • the other end of the capacitor C5 is connected to the power supply terminal D1 of the second operational amplifier A2, and the other end of the seventh resistor R7 is grounded.
  • Fig. 6 is a circuit diagram showing the inverter circuit of the backlight driving circuit of the embodiment of the present invention.
  • the inverter circuit includes: a third operational amplifier A3, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and an eleventh Resistance Rl l.
  • One end of the eighth resistor R8 is an input end of the inverter circuit, and the other end is connected to one end of the ninth resistor R9 and the tenth resistor R10, and the other end of the ninth resistor R9 is opposite to the first An output terminal of the third operational amplifier A3 is connected, and the other end of the tenth resistor R10 is connected to an inverting input end of the third operational amplifier A3.
  • One end of the eleventh resistor R11 is grounded, and the other end is opposite to the first Positive input of three operational amplifier A3 Connected, the output of the third operational amplifier A3 is the output of the inverter circuit.
  • a display device comprising the backlight drive circuit.
  • the display device may be: a liquid crystal panel, an electronic paper, an OLED panel, a liquid crystal television, a liquid crystal display, a digital photo frame, a mobile phone, a tablet computer, and the like, or any product or component having a display function.
  • the source of the transistor mentioned in the embodiment of the present invention may be the drain of the transistor, and the drain of the transistor may also be Is the source of the transistor.

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  • Computer Hardware Design (AREA)
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  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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  • Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract

公开了一种背光源驱动电路及显示装置。背光源驱动电路包括：开关场效应管（Q1）、续流场效应管（Q2）、供电模块、控制模块、LED组（Z）、反馈模块，供电模块用于给LED组（Z）供电，控制模块用于控制开关场效应管（Q1）和续流场效应管（Q2）的导通时间相反，反馈模块用于向控制模块提供反馈电压。显示装置中设置有背光源驱动模块。通过在背光源驱动电路中采用场效应管作为续流器，有效的减少了驱动电路中所消耗的功耗，提高了驱动电路的效率。

Description

背光源驱动电路及显示装置 技术领域
本发明涉及液晶显示领域，特别涉及一种背光源驱动电路及显示 装置。 背景技术
背光源是液晶显示器件的重要组成部分，其功耗和成本在整个液 晶模组中占有很大的比例。
在背光源电路中， LED上消耗的功耗转换为光， 是背光源中光的 来源， 而驱动电路上消耗的功耗转换为热， 是背光源所不需要的， 而 且所产生的热量对背光源工作的稳定性产生影响。减少驱动电路中所 消耗的功耗， 就需要尽量提高驱动电路的效率。
背光源驱动电路一般采用开关电源的方式为 LED提供恒定的工作 电流。 其中， 电感、 二极管所消耗的功耗在背光源驱动电路中占很大 的比例， 降低这些器件中的功耗， 可以将更多的电能提供给 LED , 实 现驱动效率的提高。 在开关电路中， 通常采用的续流器件为二极管， 二极管导通后， 其上有一定的压降， 而整个背光源的驱动电流流过二 极管， 所以二极管上的功耗艮大。 发明内容
本发明要解决的技术问题是：如何提供一种背光源驱动电路及显 示装置， 减少驱动电路中所消耗的功耗， 提高驱动电路的效率。
为解决上述技术问题，本发明的一个方法提供了一种背光源驱动 电路， 包括开关场效应管、 续流场效应管、供电模块、控制模块、 LED 组、 反馈模块， 所述供电模块用于给 LED组供电， 所述控制模块用于 控制所述开关场效应管和续流场效应管的导通时间相反，所述反馈模 块用于向控制模块提供反馈电压。
可选择地， 所述供电模块包括第一电感和直流电源， 所述第一电 感一端与直流电源连接，另一端与所述开关场效应管和续流场效应管 的漏极连接。
可选择地，所述控制模块包括第一运算放大器、电压跟随器电路、 反相器电路和锯齿波电路；
所述开关场效应管的源极接地，栅极与所述电压跟随器电路的输 出端连接， 所述续流场效应管的源极与所述 LED组的输入端连接， 栅 极与所述反相器电路的输出端连接，所述电压跟随器电路的输入端和 所述反相器电路的输入端连接所述第一运算放大器的输出端，所述第 一运算放大器的反向输入端与所述锯齿波电路的输出端连接，正向输 入端与所述 LED组的输出端连接。
可选择地， 所述反馈模块包括第一电阻， 所述第一电阻的一端与 所述 LED组的输出端和第一运算放大器的正向输入端连接， 另一端接 地。
可选择地， 所述背光源驱动电路还包括： 第一电容， 所述第一电 容的一端与所述 LED组的输入端和续流场效应管的源极连接， 另一端 接地。
可选择地， 所述续流场效应管导通电压为 0. 2V。
可选择地， 所述锯齿波电路包括： 时基集成电路、 第二电容、 第 三电容、 第四电容、 第二电阻、 第三电阻、 第四电阻、 第五电阻、 第 六电阻和第三场效应管；
所述时基集成电路的第一管脚接地、第四管脚和第八管脚与电源 连接， 第三管脚空置， 第七管脚连接所述第三电阻、 第四电阻和第五 电阻的一端， 第二管脚和第六管脚连接所述第四电阻的另一端， 第五 管脚连接所述第二电容的一端， 所述第二电容的另一端接地， 所述第 四电阻的另一端还与所述第三电容的一端连接，所述第三电容的另一 端接地，所述第三电阻的另一端与所述第二电阻和所述第四电容的一 端连接，所述第二电阻的另一端与电源连接并和第四管脚及第八管脚 与电源连接的一端连接，所述第五电阻的另一端与所述第三场效应管 的栅极连接， 所述第三场效应管的源极与电源连接， 漏极与所述第四 电容的另一端和第六电阻的一端连接， 所述第六电阻的另一端接地， 所述第三场效应管的漏极为所述锯齿波电路的输出端。 可选择地， 所述时基集成电路为 NE555时基集成电路。
可选择地， 所述电压跟随器电路包括： 第二运算放大器、 第五电 容、 第六电容、 第七电阻；
所述第二运算放大器的输出端为所述电压跟随器电路的输出端， 正向输入端为所述电压跟随器电路的输入端，所述第二运算放大器的 输出端与反相输入端连接，所述第六电容的一端与所述第二运算放大 器的输出端连接，另一端与所述第五电容的一端及所述第七电阻的一 端连接， 所述第五电容的另一端与所述第二运算放大器的电源端连 接， 所述第七电阻的另一端接地。
可选择地， 所述反相器电路包括： 第三运算放大器、 第八电阻、 第九电阻、 第十电阻和第十一电阻；
所述第八电阻的一端为所述反相器电路的输入端，另一端与所述 第九电阻和第十电阻的一端连接，所述第九电阻的另一端与所述第三 运算放大器的输出端连接，所述第十电阻的另一端与所述第三运算放 大器的反向输入端连接， 所述第十一电阻的一端接地， 另一端与所述 第三运算放大器的正向输入端连接，所述第三运算放大器的输出端为 所述反相器电路的输出端。
本发明的另一方面还提供一种显示装置，所述显示装置包括所述 的背光源驱动电路。
通过本发明的技术方案可以获得以下有益效果：本发明的背光源 驱动电路及显示装置，通过在背光源驱动电路中采用场效应管作为续 流器， 并利用相应的控制信号对场效应管的开关进行控制， 有效的减 少了驱动电路中所消耗的功耗， 提高了驱动电路的效率。 附图说明
图 1是本发明实施例背光源驱动电路的线路连接图；
图 2是本发明实施例背光源驱动电路的锯齿波波形图；
图 3是本发明实施例背光源驱动电路的电压跟随器电路和反相器 电路输出波形图；
图 4是本发明实施例背光源驱动电路的锯齿波电路线路连接图； 图 5是本发明实施例背光源驱动电路的电压跟随器电路线路连接 图；
图 6是本发明实施例背光源驱动电路的反相器电路线路连接图。 具体实施方式
下面结合附图和实施例，对本发明的具体实施方式作进一步详细 描述。 以下实施例用于说明本发明的原理， 但不用来限制本发明的范 围。 为了减少驱动电路中所消耗的功耗， 提高驱动电路的效率， 在本 发明实施例中提供了一种背光源驱动电路， 包括开关场效应管、 续流 场效应管、 供电模块、 控制模块、 LED组、 反馈模块， 所述供电模块 用于给 LED组供电， 所述控制模块用于控制所述开关场效应管和续流 场效应管， 使它们的导通时间相反， 所述反馈模块用于向控制模块提 供反馈电压。
本发明实施例的背光源驱动电路中，所述供电模块可以包括第一 电感和直流电源， 所述第一电感一端与直流电源连接， 另一端与所述 开关场效应管和续流场效应管的漏极连接，通过所述直流电源和第一 电感给 LED组供电。
示例性地， 所述控制模块可以包括第一运算放大器、 电压跟随器 电路、 反相器电路和锯齿波电路；
所述开关场效应管的源极接地，栅极与所述电压跟随器电路的输 出端连接， 所述续流场效应管的源极与所述 LED组的输入端连接， 栅 极与所述反相器电路的输出端连接，所述电压跟随器电路的输入端和 所述反相器电路的输入端连接所述第一运算放大器的输出端，所述第 一运算放大器的反向输入端与所述锯齿波电路的输出端连接，正向输 入端与所述 LED组的输出端连接。
示例性地， 所述反馈模块可以包括第一电阻， 所述第一电阻的一 端与所述 LED组的输出端和第一运算放大器的正向输入端连接， 另一 端接地。
进一步可选择地， 所述背光源驱动电路还可包括： 第一电容， 所 述第一电容的一端与所述 LED组的输入端和续流场效应管的源极连 接， 另一端接地。
在本发明实施例的背光源驱动电路中，所述续流场效应管导通电 压为 0. 2V。
可选择地， 在本发明实施例的背光源驱动电路中， 供电模块还可 以由直流电源和多个电感串联构成，多个串联的电感的末端与所述开 关场效应管和续流场效应管的漏极连接；反馈模块也可以由多个电阻 串联构成； 控制模块还可以由第一运算放大器、反相器电路和锯齿波 电路构成， 即省略了电压跟随器电路， 直接将开关场效应管的栅极与 第一运算放大器的输出端连接。 其供电模块、 控制模块、 反馈模块的 结构本领域技术人员可以根据需要进行改动和设置。
实施例 1
图 1示出本发明实施例的一种背光源驱动电路如。 所述背光源驱 动电路包括： 开关场效应管 Ql、 续流场效应管 Q2、 第一电感 Ll、 LED 组2、 第一电阻 Rl、 第一运算放大器 Al、 电压跟随器电路、 反相器电 路和锯齿波电路。
所述第一电感 L1一端与直流电源 VIN连接， 另一端与所述开关场 效应管 Q 1和续流场效应管 Q 2的漏极连接，所述开关场效应管 Q 1的源极 接地， 栅极与所述电压跟随器电路的输出端连接， 所述续流场效应管 Q2的源极与所述 LED组 Z的输入端连接，栅极与所述反相器电路的输出 端连接，所述电压跟随器电路的输入端和所述反相器电路的输入端连 接所述第一运算放大器 A1的输出端，所述第一运算放大器 A1的反向输 入端与所述锯齿波电路的输出端连接，正向输入端与所述 LED组 Z的输 出端连接，所述第一电阻 R1的一端与所述 LED组 Z的输出端和第一运算 放大器 A1的正向输入端连接， 另一端接地。
所述锯齿波电路用于生成一定幅值一定频率的锯齿波波形； 所述电压跟随器电路用于利用运算放大器生成电压跟随电路，可 将输入的电压值完整输出；
所述反相器电路用于利用运算放大器生成电压反相的电路， 可 将输入的电压值反向输出。
本实施例中，所述电流流过第一电阻后，在第一电阻上产生压降， 从而生成反馈电压，通过锯齿波电路生成的具有一定幅值一定频率的 锯齿波波形并联合反馈电压输入到第一运算放大器 A1 , 经由第一运 算放大器 A1进行运算处理， 从而输出控制信号， 通过电压跟随器电 路将输入的控制信号完整地输出， 从而对开关场效应管进行控制； 通 过反相器电路将输入的控制信号反向输出，从而对续流场效应管进行 控制。 在开关场效应管 Q 1导通期间， 直流电源为第一电感 L1充电， 到达一定时间后， 开关场效应管 Q 1截止， 续流场效应管 Q2导通， 第 一电感 L1通过续流场效应管 Q2将电能传递给 LED组 Z , 从而为 LED 组 Z提供稳定的输出。
第一运算放大器 A1输出的控制信号传输给开关场效应管 Q1和续 流场效应管 Q2 , 对场效应管的开关进行控制。 由于开关场效应管 Q 1 和续流场效应管 Q2的导通时间相反， 即： 开关场效应管 Q1开启时， 续 流场效应管 Q2关断； 开关场效应管 Q1关断时， 续流场效应管 Q2开启， 所以需要使两个场效应管的控制信号相位相反。本实施例中利用一个 反相器电路将第一运算放大器打开输出的信号反相后，加载到续流场 效应管 Q2的栅极。
具体地， 锯齿波电路生成的锯齿波波形如图 2所述， 其上半部分 为锯齿波波形， 下半部分为对应的处理识别后的方波波形， 将处理识 别后的方波波形与反馈电压共同输入到第一运算放大器 A1中，经由第 一运算放大器 A1进行运算处理， 从而输出控制信号。 通过电压跟随器 电路将输入的控制信号完整的输出，通过反相器电路输出反向控制信 号。
如图 3所示， 图中上半部分为电压跟随器电路输出完整的控制信 号， 下半部分为反相器电路输出的反向控制信号， 从图 3中可以看出， 上半部分和下半部分输出的信号波形相反。由于电压跟随器电路输出 的信号控制开关场效应管 Q1 ,反相器电路输出的控制信号控制续流场 效应管 Q2 , 因此开关场效应管 Q1和续流场效应管 Q2的导通时间相反， 即： 开关场效应管 Q1开启时， 续流场效应管 Q2关断； 开关场效应管 Q1 关断时， 续流场效应管 Q2开启。 在开关场效应管 Q1导通期间， 直流电 源为第一电感充电，开关场效应管 Q 1截止期间，续流场效应管 Q2导通， 第一电感通过续流场效应管 Q2将电能传递给 LED组 Z , 从而为 LED组 Z 提供稳定的输出。
第一运算放大器 A1输出波形的占空比决定了第一电感 L1的充电 时间， 从而决定了驱动电路输出电压的高低。 占空比根据反馈电压的 不同而进行调节。 如果输出 LED组 Z上电流增大， 则第一电阻 R1上电流 增大， 反馈电压增大， 第一运算放大器 A1输出方波占空比减小， 驱动 电路输出电压降低； 如输出 LED组 Z上电流减小， 则第一电阻 R1上电流 减小， 反馈电压减小， 第一运算放大器 A1输出方波占空比增加， 输出 电压增大。
可选择地， 所述背光源驱动电路还包括： 第一电容 C1 , 用于减小 直流电源经由第一电感 L1向 LED组 Z输出的电压的波动，所述第一电容 的一端与所述 LED组的输入端和续流场效应管的源极连接， 另一端接 地。
可选择地， 所述续流场效应管的导通电压为 0. 2V。
传统的开关电路中， 续流器件一般采用二极管， 二极管导通压降 为 0. 5V左右， 负载电流与导通压降的乘积为二极管消耗的功耗， 场 效应管的导通压降为 0. 2V,同样的负载电流下，其功耗降低 50%以上。 通过在背光源驱动电路中采用场效应管作为续流器，并利用相应的控 制信号对场效应管的开关进行控制，有效的减少了驱动电路中所消耗 的功耗， 提高了驱动电路的效率。
实施例 2
图 4示出本发明实施例背光源驱动电路的锯齿波电路线路连接 图。 如图 4所示， 在本发明实施例的背光源驱动电路中， 锯齿波电路 可以包括： 时基集成电路 S、 第二电容 C2、 第三电容 C3、 第四电容 C4、 第二电阻 R2、 第三电阻 R3、 第四电阻 R4、 第五电阻 R5、 第六电阻 R6 和第三场效应管 Q3;
所述时基集成电路 S的第一管脚接地、 第四管脚和第八管脚与电 源 VCC连接， 第三管脚空置， 第七管脚连接所述第三电阻 R3、 第四电 阻 R4和第五电阻 R5的一端，第二管脚和第六管脚连接所述第四电阻 R4 的另一端， 第五管脚连接所述第二电容 C2的一端， 所述第二电容 C2 的另一端接地，所述第四电阻 R4的另一端还与所述第三电容 C 3的一端 连接， 所述第三电容 C3的另一端接地， 所述第三电阻 R3的另一端与所 述第二电阻 R2和所述第四电容 C4的一端连接 ,所述第二电阻 R2的另一 端与电源 VCC连接并和第四管脚及第八管脚与电源连接的一端连接， 所述第五电阻 R5的另一端与所述第三场效应管 Q3的栅极连接，所述第 三场效应管 Q 3的漏极与电源 VCC连接， 源极与所述第四电容 C4的另一 端和第六电阻 R6的一端连接， 所述第六电阻 R6的另一端接地， 所述第 三场效应管 Q3的源极为所述锯齿波电路的输出端。
可选择地， 所述时基集成电路为 NE555时基集成电路。
实施例 3
图 5 示出本发明实施例背光源驱动电路的电压跟随器电路线路 连接图。 如图 5所示， 在本发明实施例的背光源驱动电路中， 电压跟 随器电路可以包括： 第二运算放大器 A2、第五电容 C5、 第六电容 C6、 第七电阻 R7;
所述第二运算放大器 A2的输出端为所述电压跟随器电路的输出 端， 正向输入端为所述电压跟随器电路的输入端， 所述第二运算放大 器 A2的输出端与反相输入端连接，所述第六电容 C6的一端与所述第 二运算放大器 A2的输出端连接，另一端与所述第五电容 C5的一端及 所述第七电阻 R7的一端连接，所述第五电容 C5的另一端与所述第二 运算放大器 A2的电源端 D1连接， 所述第七电阻 R7的另一端接地。 实施例 4
图 6 示出本发明实施例背光源驱动电路的反相器电路线路连接 图。 如图 6所示， 在本发明实施例的背光源驱动电路中， 所述反相器 电路包括： 第三运算放大器 A3、 第八电阻 R8、 第九电阻 R9、 第十电 阻 R10和第十一电阻 Rl l。
所述第八电阻 R8的一端为所述反相器电路的输入端， 另一端与 所述第九电阻 R9和第十电阻 R10的一端连接，所述第九电阻 R9的另 一端与所述第三运算放大器 A3的输出端连接， 所述第十电阻 R10的 另一端与所述第三运算放大器 A3的反向输入端连接， 所述第十一电 阻 R11的一端接地， 另一端与所述第三运算放大器 A3的正向输入端 连接，所述第三运算放大器 A3的输出端为所述反相器电路的输出端。 按照本发明的实施例， 还提供一种显示装置， 所述显示装置包括 所述的背光源驱动电路。 所述显示装置可以为： 液晶面板、 电子纸、 0LED 面板、 液晶电视、 液晶显示器、 数码相框、 手机、 平板电脑等 任何具有显示功能的产品或部件。
需要说明的是， 对于显示领域的晶体管来说， 漏极和源极没有明 确的区别，因此本发明实施例中所提到的晶体管的源极可以为晶体管 的漏极， 晶体管的漏极也可以为晶体管的源极。
以上实施方式仅用于说明本发明， 而并非对本发明的限制， 有关 技术领域的普通技术人员， 在不脱离本发明的精神和范围的情况下， 还可以做出各种变化和变型，因此所有等同的技术方案也属于本发明 的范畴， 本发明的专利保护范围应由权利要求限定。

Claims

权 利 要 求 书
1、 一种背光源驱动电路， 包括开关场效应管、 续流场效应管、 供电模块、 控制模块、 LED组、 反馈模块， 所述供电模块用于给 LED 组供电，所述控制模块用于控制所述开关场效应管和续流场效应管的 导通时间相反， 所述反馈模块用于向控制模块提供反馈电压。
2、 如权利要求 1所述的背光源驱动电路， 其中， 所述供电模块包 括第一电感和直流电源， 所述第一电感一端与直流电源连接， 另一端 与所述开关场效应管和续流场效应管的漏极连接。
3、 如权利要求 1所述的背光源驱动电路， 其中， 所述供电模块包 括直流电源和多个串联的电感，多个串联的电感的末端与所述开关场 效应管和续流场效应管的漏极连接。
4、 如权利要求 2所述的背光源驱动电路， 其中， 所述控制模块包 括第一运算放大器、 电压跟随器电路、 反相器电路和锯齿波电路； 所述开关场效应管的源极接地，栅极与所述电压跟随器电路的输 出端连接， 所述续流场效应管的源极与所述 LED组的输入端连接， 栅 极与所述反相器电路的输出端连接，所述电压跟随器电路的输入端和 所述反相器电路的输入端连接所述第一运算放大器的输出端，所述第 一运算放大器的反向输入端与所述锯齿波电路的输出端连接，正向输 入端与所述 LED组的输出端连接。
5、 如权利要求 4所述的背光源驱动电路， 其中， 所述反馈模块包 括第一电阻， 所述第一电阻的一端与所述 LED组的输出端和第一运算 放大器的正向输入端连接， 另一端接地。
6、 如权利要求 5所述的背光源驱动电路， 其中， 所述第一电阻为 多个串联的电阻。
7、 如权利要求 2所述的背光源驱动电路， 其中， 控制模块包括第 一运算放大器、反相器电路和锯齿波电路， 所述开关场效应管的栅极 直接与第一运算放大器的输出端连接。
8、 如权利要求 1-7任一所述的背光源驱动电路， 其中， 所述背光 源驱动电路还包括： 第一电容， 所述第一电容的一端与所述 LED组的 输入端和续流场效应管的源极连接， 另一端接地。
9、 如权利要求 1-7任一所述的背光源驱动电路， 其中， 所述续流 场效应管导通电压为 0. 2V。
10、 如权利要求 4所述的背光源驱动电路， 其中， 所述锯齿波电 路包括： 时基集成电路、 第二电容、 第三电容、 第四电容、 第二电阻、 第三电阻、 第四电阻、 第五电阻、 第六电阻和第三场效应管；
所述时基集成电路的第一管脚接地、第四管脚和第八管脚与电源 连接， 第三管脚空置， 第七管脚连接所述第三电阻、 第四电阻和第五 电阻的一端， 第二管脚和第六管脚连接所述第四电阻的另一端， 第五 管脚连接所述第二电容的一端， 所述第二电容的另一端接地， 所述第 四电阻的另一端还与所述第三电容的一端连接，所述第三电容的另一 端接地，所述第三电阻的另一端与所述第二电阻和所述第四电容的一 端连接，所述第二电阻的另一端与电源连接并和第四管脚及第八管脚 与电源连接的一端连接，所述第五电阻的另一端与所述第三场效应管 的栅极连接， 所述第三场效应管的源极与电源连接， 漏极与所述第四 电容的另一端和第六电阻的一端连接， 所述第六电阻的另一端接地， 所述第三场效应管的漏极为所述锯齿波电路的输出端。
11、 如权利要求 1 0所述的背光源驱动电路， 其中， 所述时基集成 电路为 NE555时基集成电路。
12、 如权利要求 4所述的背光源驱动电路， 其中， 所述电压跟随 器电路包括： 第二运算放大器、 第五电容、 第六电容、 第七电阻； 所述第二运算放大器的输出端为所述电压跟随器电路的输出端， 正向输入端为所述电压跟随器电路的输入端，所述第二运算放大器的 输出端与反相输入端连接，所述第六电容的一端与所述第二运算放大 器的输出端连接，另一端与所述第五电容的一端及所述第七电阻的一 端连接， 所述第五电容的另一端与所述第二运算放大器的电源端连 接， 所述第七电阻的另一端接地。
1 3、 如权利要求 4所述的背光源驱动电路， 其中， 所述反相器电 路包括： 第三运算放大器、 第八电阻、 第九电阻、 第十电阻和第十一 电阻； 所述第八电阻的一端为所述反相器电路的输入端，另一端与所述 第九电阻和第十电阻的一端连接，所述第九电阻的另一端与所述第三 运算放大器的输出端连接，所述第十电阻的另一端与所述第三运算放 大器的反向输入端连接， 所述第十一电阻的一端接地， 另一端与所述 第三运算放大器的正向输入端连接，所述第三运算放大器的输出端为 所述反相器电路的输出端。
14、 一种显示装置， 包括如权利要求 1-13任一项所述的背光源 驱动电路。
PCT/CN2013/089153 2013-07-11 2013-12-12 背光源驱动电路及显示装置 WO2015003459A1 (zh)

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