WO2015058423A1 - 背光驱动电路以及液晶显示装置 - Google Patents
背光驱动电路以及液晶显示装置 Download PDFInfo
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- WO2015058423A1 WO2015058423A1 PCT/CN2013/086493 CN2013086493W WO2015058423A1 WO 2015058423 A1 WO2015058423 A1 WO 2015058423A1 CN 2013086493 W CN2013086493 W CN 2013086493W WO 2015058423 A1 WO2015058423 A1 WO 2015058423A1
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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
- 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
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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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
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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
-
- 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
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light 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
- G09G2310/00—Command of the display device
- G09G2310/06—Details of flat display driving waveforms
- G09G2310/068—Application of pulses of alternating polarity prior to the drive pulse in electrophoretic displays
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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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
Definitions
- the present invention relates to a driving circuit, and more particularly to a backlight driving circuit and a liquid crystal display device having the same.
- the liquid crystal display device mainly comprises a liquid crystal panel and a backlight module, and the backlight module is used for providing light required for displaying the image on the liquid crystal panel.
- Existing backlight modules are mainly light-emitting diodes (Light Emitting Diode; LED) as a light source. More specifically, the existing illumination source includes a plurality of LED strips connected in parallel, and each LED strip includes a plurality of LEDs connected in series.
- a backlight driving circuit supplies a required driving current to drive all the LED strips.
- the existing backlight driving circuit does not limit the driving current flowing through the LED strips. When a large current is generated due to an abnormal condition, the LED strip and the backlight driving circuit will be burned by a large current.
- a backlight driving circuit for driving at least one LED light bar.
- the backlight driving circuit includes a power module, a conversion module, a comparison module and a control module.
- the power module is configured to provide a driving current to the LED strip.
- the conversion module is electrically coupled to the power module for generating a conversion voltage according to the driving current.
- the comparison module is electrically coupled to the conversion module for comparing the conversion voltage with a reference voltage.
- the control module is electrically coupled to the power module, the comparison module, and the LED strip. When the conversion voltage is greater than the reference voltage, the control module controls the power supply module to stop providing the driving current to the LED light bar.
- the control module controls the power module to provide the driving current to the LED strip when the conversion voltage is less than the reference voltage.
- the conversion module includes a photocoupler and a first resistor.
- the photocoupler includes a light emitting element and a switching element.
- the light emitting device is electrically coupled between the power module and the positive terminal of the LED strip for transmitting the driving current.
- the first resistor has a first end and a second end.
- the switching element is electrically coupled between a voltage source and the first end of the first resistor for outputting a switching current according to the luminous intensity of the light emitting element, wherein the switching voltage is the switching current multiplied Taking the resistance value of the first resistor.
- the comparison module includes an operational amplifier and a first N-type metal-oxide-semiconductor transistor.
- the operational amplifier includes a non-inverting input, an inverting input, and an output.
- the non-inverting input is electrically coupled to the switching voltage.
- the inverting input is electrically coupled to the reference voltage.
- An output of the operational amplifier is electrically coupled to a gate of the first N-type metal-oxide-semiconductor transistor.
- the source of the first N-type metal-oxide-semiconductor transistor is electrically coupled to a ground.
- the output of the operational amplifier When the conversion voltage is greater than the reference voltage, the output of the operational amplifier is at a high level, the first N-type metal-oxide-semiconductor transistor is turned on, the first N-type metal-oxide - The drain of the semiconductor transistor becomes a low level.
- the conversion voltage is less than the reference voltage, an output of the operational amplifier is at a low level, the first N-type metal-oxide-semiconductor transistor is non-conductive, and the first N-type metal-oxidation The drain of the semiconductor-semiconductor transistor becomes a high level.
- the control module includes a control unit and a second N-type metal-oxide-semiconductor transistor.
- the control unit has a consistent energy end and a plurality of control terminals.
- the enable terminal is electrically coupled to a drain of the first N-type metal-oxide-semiconductor transistor.
- the second N-type metal-oxide-semiconductor transistor is electrically coupled to the control unit.
- the control unit controls the power supply module to stop providing the said power supply module by the second N-type metal-oxide-semiconductor transistor when a drain of the first N-type metal-oxide-semiconductor transistor becomes a low level Driving current is supplied to the LED strip.
- the control unit controls the power supply module to provide the driving by the second N-type metal-oxide-semiconductor transistor when a drain of the first N-type metal-oxide-semiconductor transistor becomes a high level Current is supplied to the LED strip.
- the present invention provides a backlight driving circuit for driving at least one LED light bar.
- the backlight driving circuit includes a power module, a conversion module, a comparison module, and a control module.
- the power module is configured to provide a driving current to the LED strip.
- the conversion module is electrically coupled to the power module for generating a conversion voltage according to the driving current.
- the comparison module is electrically coupled to the conversion module for comparing the conversion voltage with a reference voltage.
- the control module is electrically coupled to the power module, the comparison module, and the LED light bar, and is configured to control whether the power module provides the driving according to whether the conversion voltage is greater than the reference voltage. Current is supplied to the LED strip.
- the control module controls the power supply module to stop providing the driving current to the LED light bar.
- the control module controls the power supply module to supply the driving current to the LED light bar.
- the conversion module includes a photocoupler and a first resistor.
- the photocoupler includes a light emitting element and a switching element.
- the light emitting device is electrically coupled between the power module and the positive terminal of the LED strip for transmitting the driving current.
- the first resistor has a first end and a second end.
- the switching element is electrically coupled between a voltage source and the first end of the first resistor for outputting a switching current according to the luminous intensity of the light emitting element, wherein the switching voltage is the switching current multiplied Taking the resistance value of the first resistor.
- the comparison module includes an operational amplifier and a first N-type metal-oxide-semiconductor transistor.
- the operational amplifier includes a non-inverting input, an inverting input, and an output.
- the non-inverting input is electrically coupled to the switching voltage.
- the inverting input is electrically coupled to the reference voltage.
- An output of the operational amplifier is electrically coupled to a gate of the first N-type metal-oxide-semiconductor transistor.
- the source of the first N-type metal-oxide-semiconductor transistor is electrically coupled to a ground.
- the output of the operational amplifier When the conversion voltage is greater than the reference voltage, the output of the operational amplifier is at a high level, the first N-type metal-oxide-semiconductor transistor is turned on, the first N-type metal-oxide - The drain of the semiconductor transistor becomes a low level.
- the conversion voltage is less than the reference voltage, an output of the operational amplifier is at a low level, the first N-type metal-oxide-semiconductor transistor is non-conductive, and the first N-type metal-oxidation The drain of the semiconductor-semiconductor transistor becomes a high level.
- the control module includes a control unit and a second N-type metal-oxide-semiconductor transistor.
- the control unit has a consistent energy end and a plurality of control terminals.
- the enable terminal is electrically coupled to a drain of the first N-type metal-oxide-semiconductor transistor.
- the second N-type metal-oxide-semiconductor transistor is electrically coupled to the control unit.
- the control unit controls the power supply module to stop providing the said power supply module by the second N-type metal-oxide-semiconductor transistor when a drain of the first N-type metal-oxide-semiconductor transistor becomes a low level Driving current is supplied to the LED strip.
- the control unit controls the power supply module to provide the driving by the second N-type metal-oxide-semiconductor transistor when a drain of the first N-type metal-oxide-semiconductor transistor becomes a high level Current is supplied to the LED strip.
- the present invention also provides a liquid crystal display device comprising the above backlight driving circuit.
- the backlight driving circuit and the liquid crystal display device of the present invention can limit the driving current flowing through the LED strip.
- the control module can control the power module to stop providing the driving current.
- FIG. 1 is a block diagram of a backlight driving circuit according to an embodiment of the present invention.
- FIG. 2 is a detailed circuit diagram of the backlight driving circuit and the LED light bar of FIG. 1.
- FIG. 1 is a block diagram of a backlight driving circuit 1 according to an embodiment of the present invention.
- the backlight driving circuit 1 is configured to drive at least one LED strip 30, 32.
- the backlight driving circuit 1 includes a power module 10, a conversion module 12, a comparison module 14, and a control module 16.
- the power module 10 is configured to output a power voltage VS to provide a driving current ID to the LED strips 30, 32.
- the power module 10 is further configured to supply power to the control module 16 .
- the conversion module 12 is electrically coupled to the power module 10 for generating a conversion voltage VA according to the driving current ID.
- the comparison module 14 is electrically coupled to the conversion module 12 for comparing the conversion voltage VA with a reference voltage VREF (as shown in FIG. 2).
- the control module 16 is electrically coupled to the power module 10, the comparison module 14, and the LED strips 30, 32 for determining whether the conversion voltage VA is greater than the reference voltage VREF (as shown in the figure). 2) controlling whether the power module 10 supplies the drive current ID to the LED strips 30, 32.
- control module 16 controls the power module 10 to stop providing the driving current ID to the LED strips 30, 32.
- control module 16 controls the power module 10 to provide the driving current ID to the LED strips 30, 32.
- control module 16 can further control the LED strips 30, 32.
- FIG. 2 is a detailed circuit diagram of the backlight driving circuit 1 and the LED strips 30 and 32 of FIG.
- the power module 10 includes a power source 100, a coil L1, and a diode D1.
- a first end of the coil L1 is electrically coupled to the power source 100, and a second end of the coil L1 is electrically coupled to the anode of the diode D1.
- the coil L1 is used to convert the voltage of the power source 100 into a power supply voltage VS suitable for the conversion module 12 and the control module 16.
- the cathode of the diode D1 is electrically coupled to the conversion module 12 for preventing a reverse current.
- the coil L1 is an optional component, and when the power source 100 can provide a power supply voltage VS suitable for the conversion module 12 and the control module 16, the Coil L1.
- the conversion module 12 includes a photocoupler (photo Coupler) 120 and a first resistor R1.
- the first resistor R1 has a first end and a second end.
- the photocoupler 120 includes a light emitting element P and a switching element SW.
- the light emitting element P is electrically coupled between the power module 10 and the positive terminal LED+ of the LED strips 30 and 32 for transmitting the driving current ID.
- the switching element SW is electrically coupled between a voltage source (eg, +12V) and the first end of the first resistor R1 for outputting a switching current ISW according to the luminous intensity of the light emitting element P.
- the second end of the first resistor R1 is electrically coupled to a ground GND.
- the comparison module 14 includes an operational amplifier OP and a first N-Mental-Oxide-Semiconductor (N-MOS) Q1.
- the operational amplifier OP includes a positive phase input terminal +, an inverting input terminal - and an output terminal O.
- the positive phase input terminal is electrically coupled to the first end of the first resistor R1, that is, electrically coupled to the conversion voltage VA.
- the inverting input terminal is electrically coupled to the reference voltage VREF.
- the output terminal O is electrically coupled to the gate G1 of the first N-type metal-oxide-semiconductor transistor Q1.
- the source S1 of the first N-type metal-oxide-semiconductor transistor Q1 is electrically coupled to the ground GND.
- the control module 16 includes a control unit 160, a second resistor R2, a third resistor R3, a fourth resistor R4, and a second N-type metal-oxide-semiconductor transistor Q2.
- the control unit 160 is an integrated circuit (Integrated Circuit; IC) and has an enable terminal EN and a plurality of control terminals P1-P8.
- a first end of the second resistor R2 is electrically coupled to the control terminal P1, and a second end of the second resistor R2 is electrically coupled to the second N-type metal-oxide-semiconductor Gate G2 of transistor Q2.
- a first end of the third resistor R3 is electrically coupled to the control terminal P8, and a second end of the third resistor R3 is electrically coupled to the second N-type metal-oxide-semiconductor Source S2 of transistor Q2.
- a first end of the fourth resistor R4 is electrically coupled to the source S2 of the second N-type metal-oxide-semiconductor transistor Q2, and a second end of the fourth resistor R4 is electrically coupled To the ground GND.
- the drain D2 of the second N-type metal-oxide-semiconductor transistor Q2 is electrically coupled to the anode of the diode D1.
- the enable terminal EN is electrically coupled to the drain D1 of the first N-type metal-oxide-semiconductor transistor Q1.
- the control unit 160 When the enable terminal EN is at a high level, the control unit 160 is enabled to operate normally, that is, the control unit 160 controls the power module 10 to provide the drive current ID to the The LED light bar 30, 32; when the enable terminal EN is at a low level, the control unit 160 is disabled and stops working, that is, the control unit 160 controls the power module 10 to stop providing The drive current ID is given to the LED strips 30,32.
- the control terminals P2-P7 will be described in detail later.
- the embodiment of Figure 2 includes two LED strips 30, 32. In other embodiments, the number of LED strips 30, 32 is not limited.
- the two LED strips 30, 32 are coupled in parallel.
- the LED strips 30, 32 each include a plurality of LEDs coupled in series.
- the series-coupled LEDs have a positive terminal LED+ and a negative terminal LED-.
- Each of the light emitting diodes LED has an anode and a cathode.
- the anode of the first LED is electrically coupled to the cathode of the light emitting element P, that is, the positive terminal LED+ is electrically coupled to the cathode of the light emitting element P
- the cathode of one LED is electrically coupled to the drain D3 of a third N-type metal-oxide-semiconductor transistor Q3, that is, the cathode LED is electrically coupled to the third N-type metal.
- the gate G3, the source S3, and the drain D3 of the third N-type metal-oxide-semiconductor transistor Q3 are electrically coupled to the control terminals P2-P4 of the control unit 160, respectively.
- the anode of the first LED is electrically coupled to the cathode of the light emitting element P, that is, the positive terminal LED+ is electrically coupled to the light emitting element P.
- a cathode the cathode of the most light-emitting diode LED is electrically coupled to the drain D4 of a fourth N-type metal-oxide-semiconductor transistor Q4, that is, the negative terminal LED is electrically coupled to the fourth The drain D4 of the N-type metal-oxide-semiconductor transistor Q4.
- the gate G4, the source S4 and the drain D4 of the fourth N-type metal-oxide-semiconductor transistor Q4 are electrically coupled to the control terminals P5-P7 of the control unit 160, respectively.
- control unit 160 can be used to control the conduction and non-conduction of the third N-type metal-oxide-semiconductor transistor Q3 and the fourth N-type metal-oxide-semiconductor transistor Q4.
- the drive current ID flowing through the light-emitting element P is equal to the sum of the current I1 flowing through the light-emitting diode strip 30 and the current I2 flowing through the light-emitting diode strip 32.
- the driving current ID is equal to ⁇ ISW
- ⁇ is the current transfer rate (Current Transfer The reciprocal of Ratio; CTR)
- the current transfer rate is equal to ISW/ID
- ISW is the current flowing through the switching element SW.
- the maximum value of the current ISW flowing through the switching element SW is VREF/R4, so the maximum value of the driving current ID flowing through the light-emitting element P is ⁇
- VREF/R4 can be defined to flow through the light-emitting element P by setting the value of the fourth resistor R4 and the value of the reference voltage VREF in advance. The maximum value of the drive current ID.
- the driving current ID flowing through the light emitting element P is larger than ⁇
- the conversion voltage VA of the node A is greater than the reference voltage VREF
- the output terminal O of the operational amplifier OP is at a high level
- the first N-type metal-oxide-semiconductor transistor Q1 is turned on.
- the drain D1 of the first N-type metal-oxide-semiconductor transistor Q1 becomes a low level, and the low level will cause the control unit 160 to stop working (ie, disable), thereby achieving protection of the backlight driving circuit 1 And the purpose of the LED strips 30, 32.
- control unit 160 controls the second N-type metal-oxide-semiconductor transistor Q2 to be non-conducting through the control terminals P1, P8, thereby causing the power module 10 to stop providing the driving current ID.
- the control unit 160 controls the second N-type metal-oxide-semiconductor transistor Q2 to be turned on by the control terminals P1, P8, thereby causing the power module 10 to provide the drive current ID to the LED strips 30, 32.
- control unit 160 can control the conduction and non-conduction of the third N-type metal-oxide-semiconductor transistor Q3 of the LED strip 30 through the control terminals P2-P4, thereby controlling the LED lamp.
- the control unit 160 can control the conduction and non-conduction of the fourth N-type metal-oxide-semiconductor transistor Q4 of the LED strip 32 through the control terminals P5-P7, thereby controlling the LED strip 32. Operation.
- the N-type metal-oxide-semiconductor transistors Q1-Q4 may be replaced with P-type metal-oxide-semiconductor transistors.
- the present invention further provides a liquid crystal display device including the above-described backlight driving circuit 1.
- the backlight driving circuit and the liquid crystal display device of the present invention can define a driving current flowing through the LED strip.
- the control module can control the power module to stop providing the driving current.
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Abstract
提供了一种背光驱动电路以及液晶显示装置。背光驱动电路(1)用于驱动至少一发光二极管灯条(30,32)。背光驱动电路(1)包括一电源模块(10)、一转换模块(12)、一比较模块(14)以及一控制模块(16)。电源模块(10)用于提供一驱动电流(ID)给发光二极管灯条(30,32)。转换模块(12)用于根据驱动电流(ID)产生一转换电压(VA)。比较模块(14)用于比较转换电压(VA)与一参考电压(VREF)。控制模块(16)用于根据转换电压(VA)是否大于参考电压(VREF)来控制电源模块(10)是否提供驱动电流(ID)给发光二极管灯条(30,32)。背光驱动电路(1)以及液晶显示装置能限定流过发光二极管灯条(30,32)的驱动电流(ID)。
Description
本发明涉及驱动电路,特别是涉及一种背光驱动电路及具有所述背光驱动电路的液晶显示装置。
液晶显示装置主要包括液晶面板及背光模块,背光模块是用于提供液晶面板显示影像时所需的光线。现有背光模块主要是以发光二极管(Light
Emitting Diode;LED)作为发光源。更明确地说,现有发光源包括若干个并联的发光二极管灯条,各发光二极管灯条包括若干个串联的发光二极管。
在上述现有背光模块中,是由一背光驱动电路提供所需的驱动电流来驱动所有发光二极管灯条,然而现有的背光驱动电路并不能限定流过发光二极管灯条的驱动电流,一旦发生异常状况而产生大电流时,发光二极管灯条及背光驱动电路将会被大电流烧坏。
因此需要对现有技术中不能限定流过发光二极管灯条的驱动电流,发生异常状况而产生大电流时,发光二极管灯条及背光驱动电路将会被大电流烧坏的问题提出解决方法。
本发明的目的在于提供一种背光驱动电路以及液晶显示装置,其能限定流过发光二极管灯条的驱动电流。
本发明提供的一种背光驱动电路用于驱动至少一发光二极管灯条,所述背光驱动电路包括一电源模块、一转换模块、一比较模块以及一控制模块。所述电源模块用于提供一驱动电流给所述发光二极管灯条。所述转换模块电性耦接至所述电源模块,用于根据所述驱动电流产生一转换电压。所述比较模块电性耦接至所述转换模块,用于比较所述转换电压与一参考电压。所述控制模块电性耦接至所述电源模块、所述比较模块及所述发光二极管灯条。当所述转换电压大于所述参考电压时,所述控制模块控制所述电源模块停止提供所述驱动电流给所述发光二极管灯条。当所述转换电压小于所述参考电压时,所述控制模块控制所述电源模块提供所述驱动电流给所述发光二极管灯条。
在本发明的背光驱动电路中,所述转换模块包括一光电耦合器以及一第一电阻。所述光电耦合器包括一发光元件以及一开关元件。所述发光元件电性耦接于所述电源模块及所述发光二极管灯条的正极端之间,用于传输所述驱动电流。所述第一电阻具有一第一端以及一第二端。所述开关元件电性耦接于一电压源及所述第一电阻的第一端之间,用于根据所述发光元件的发光强度输出一开关电流,所述转换电压为所述开关电流乘以所述第一电阻的电阻值。
在本发明的背光驱动电路中,所述比较模块包括一运算放大器以及一第一N型金属-氧化物-半导体晶体管。所述运算放大器包括一正相输入端、一反相输入端以及一输出端。所述正相输入端电性耦接至所述转换电压。所述反相输入端电性耦接至所述参考电压。所述运算放大器的输出端电性耦接至所述第一N型金属-氧化物-半导体晶体管的闸极。所述第一N型金属-氧化物-半导体晶体管的源极电性耦接至一接地端。当所述转换电压大于所述参考电压时,所述运算放大器的输出端为高电平,所述第一N型金属-氧化物-半导体晶体管导通,所述第一N型金属-氧化物-半导体晶体管的漏极变成低电平。当所述转换电压小于所述参考电压时,所述运算放大器的输出端为低电平,所述第一N型金属-氧化物-半导体晶体管不导通,所述第一N型金属-氧化物-半导体晶体管的漏极变成高电平。
在本发明的背光驱动电路中,所述控制模块包括一控制单元以及一第二N型金属-氧化物-半导体晶体管。所述控制单元具有一致能端以及若干个控制端。所述致能端电性耦接至所述第一N型金属-氧化物-半导体晶体管的漏极。所述第二N型金属-氧化物-半导体晶体管电性耦接至所述控制单元。当所述第一N型金属-氧化物-半导体晶体管的漏极变成低电平时,所述控制单元通过所述第二N型金属-氧化物-半导体晶体管控制所述电源模块停止提供所述驱动电流给所述发光二极管灯条。当所述第一N型金属-氧化物-半导体晶体管的漏极变成高电平时,所述控制单元通过所述第二N型金属-氧化物-半导体晶体管控制所述电源模块提供所述驱动电流给所述发光二极管灯条。
为解决上述问题,本发明提供的一种背光驱动电路用于驱动至少一发光二极管灯条,所述背光驱动电路包括一电源模块、一转换模块、一比较模块以及一控制模块。所述电源模块用于提供一驱动电流给所述发光二极管灯条。所述转换模块电性耦接至所述电源模块,用于根据所述驱动电流产生一转换电压。所述比较模块电性耦接至所述转换模块,用于比较所述转换电压与一参考电压。所述控制模块电性耦接至所述电源模块、所述比较模块及所述发光二极管灯条,用于根据所述转换电压是否大于所述参考电压来控制所述电源模块是否提供所述驱动电流给所述发光二极管灯条。
在本发明的背光驱动电路中,当所述转换电压大于所述参考电压时,所述控制模块控制所述电源模块停止提供所述驱动电流给所述发光二极管灯条。
在本发明的背光驱动电路中,当所述转换电压小于所述参考电压时,所述控制模块控制所述电源模块提供所述驱动电流给所述发光二极管灯条。
在本发明的背光驱动电路中,所述转换模块包括一光电耦合器以及一第一电阻。所述光电耦合器包括一发光元件以及一开关元件。所述发光元件电性耦接于所述电源模块及所述发光二极管灯条的正极端之间,用于传输所述驱动电流。所述第一电阻具有一第一端以及一第二端。所述开关元件电性耦接于一电压源及所述第一电阻的第一端之间,用于根据所述发光元件的发光强度输出一开关电流,所述转换电压为所述开关电流乘以所述第一电阻的电阻值。
在本发明的背光驱动电路中,所述比较模块包括一运算放大器以及一第一N型金属-氧化物-半导体晶体管。所述运算放大器包括一正相输入端、一反相输入端以及一输出端。所述正相输入端电性耦接至所述转换电压。所述反相输入端电性耦接至所述参考电压。所述运算放大器的输出端电性耦接至所述第一N型金属-氧化物-半导体晶体管的闸极。所述第一N型金属-氧化物-半导体晶体管的源极电性耦接至一接地端。当所述转换电压大于所述参考电压时,所述运算放大器的输出端为高电平,所述第一N型金属-氧化物-半导体晶体管导通,所述第一N型金属-氧化物-半导体晶体管的漏极变成低电平。当所述转换电压小于所述参考电压时,所述运算放大器的输出端为低电平,所述第一N型金属-氧化物-半导体晶体管不导通,所述第一N型金属-氧化物-半导体晶体管的漏极变成高电平。
在本发明的背光驱动电路中,所述控制模块包括一控制单元以及一第二N型金属-氧化物-半导体晶体管。所述控制单元具有一致能端以及若干个控制端。所述致能端电性耦接至所述第一N型金属-氧化物-半导体晶体管的漏极。所述第二N型金属-氧化物-半导体晶体管电性耦接至所述控制单元。当所述第一N型金属-氧化物-半导体晶体管的漏极变成低电平时,所述控制单元通过所述第二N型金属-氧化物-半导体晶体管控制所述电源模块停止提供所述驱动电流给所述发光二极管灯条。当所述第一N型金属-氧化物-半导体晶体管的漏极变成高电平时,所述控制单元通过所述第二N型金属-氧化物-半导体晶体管控制所述电源模块提供所述驱动电流给所述发光二极管灯条。
本发明还提供一种液晶显示装置,包括上述背光驱动电路。
相较于现有技术,本发明的背光驱动电路以及液晶显示装置能限定流过发光二极管灯条的驱动电流,当驱动电流大于预设的最大值时,控制模块能控制电源模块停止提供驱动电流。
图1为根据本发明实施例的背光驱动电路的方块图;以及
图2为图1的背光驱动电路及发光二极管灯条的详细电路图。
以下各实施例的说明是参考附加的图式,用以例示本发明可用以实施的特定实施例。
请参阅图1,图1为根据本发明实施例的背光驱动电路1的方块图。
所述背光驱动电路1用于驱动至少一发光二极管灯条30、32,所述背光驱动电路1包括一电源模块10、一转换模块12、一比较模块14以及一控制模块16。
所述电源模块10用于输出一电源电压VS以提供一驱动电流ID给所述发光二极管灯条30、32。所述电源模块10还用于供电给所述控制模块16。
所述转换模块12电性耦接至所述电源模块10,用于根据所述驱动电流ID产生一转换电压VA。
所述比较模块14电性耦接至所述转换模块12,用于比较所述转换电压VA与一参考电压VREF(如图2所示)。
所述控制模块16电性耦接至所述电源模块10、所述比较模块14及所述发光二极管灯条30、32,用于根据所述转换电压VA是否大于所述参考电压VREF(如图2所示)控制所述电源模块10是否提供所述驱动电流ID给所述发光二极管灯条30、32。
当所述转换电压VA大于所述参考电压VREF时,所述控制模块16控制所述电源模块10停止提供所述驱动电流ID给所述发光二极管灯条30、32。
当所述转换电压VA小于所述参考电压VREF时,所述控制模块16控制所述电源模块10提供所述驱动电流ID给所述发光二极管灯条30、32。
此外,所述控制模块16可进一步控制所述发光二极管灯条30、32。
请同时参阅图1以及图2,图2为图1的背光驱动电路1及发光二极管灯条30、32的详细电路图。
所述电源模块10包括一电源100、一线圈L1、以及一二极管D1。所述线圈L1的一第一端电性耦接至所述电源100,所述线圈L1的一第二端电性耦接至所述二极管D1的阳极。所述线圈L1用于将所述电源100的电压转换为适用于所述转换模块12及所述控制模块16的电源电压VS。所述二极管D1的阴极电性耦接至所述转换模块12,用于防止一反向电流。
要说明的是,所述线圈L1为一可选择的(optional)元件,当所述电源100能提供适用于所述转换模块12及所述控制模块16的电源电压VS时,则可以省略所述线圈L1。
所述转换模块12包括一光电耦合器(photo
coupler)120以及一第一电阻R1。所述第一电阻R1具有一第一端以及一第二端。所述光电耦合器120包括一发光元件P以及一开关元件SW。所述发光元件P电性耦接于所述电源模块10及所述发光二极管灯条30、32的正极端LED+之间,用于传输所述驱动电流ID。所述开关元件SW电性耦接于一电压源(例如+12V)以及所述第一电阻R1的第一端之间,用于根据所述发光元件P的发光强度输出一开关电流ISW。所述所述第一电阻R1的第二端电性耦接至一接地端GND。
所述比较模块14包括一运算放大器OP以及一第一N型金属-氧化物-半导体晶体管(N-Mental-Oxide-Semiconductor;N-MOS)Q1。所述运算放大器OP包括一正相输入端+、一反相输入端-以及一输出端O。所述正相输入端+电性耦接至所述第一电阻R1的第一端,亦即电性耦接至所述转换电压VA。所述反相输入端-电性耦接至所述参考电压VREF。所述输出端O电性耦接至所述第一N型金属-氧化物-半导体晶体管Q1的闸极G1。所述第一N型金属-氧化物-半导体晶体管Q1的源极S1电性耦接至所述接地端GND。
所述控制模块16包括一控制单元160、一第二电阻R2、一第三电阻R3、一第四电阻R4以及一第二N型金属-氧化物-半导体晶体管Q2。于本实施例中,所述控制单元160为一集成电路(Integrated
Circuit;IC)且具有一致能(enable)端EN以及若干个控制端P1-P8。所述第二电阻R2的一第一端电性耦接至所述控制端P1,所述第二电阻R2的一第二端电性耦接至所述第二N型金属-氧化物-半导体晶体管Q2的闸极G2。所述第三电阻R3的一第一端电性耦接至所述控制端P8,所述第三电阻R3的一第二端电性耦接至所述第二N型金属-氧化物-半导体晶体管Q2的源极S2。所述第四电阻R4的一第一端电性耦接至所述第二N型金属-氧化物-半导体晶体管Q2的源极S2,所述第四电阻R4的一第二端电性耦接至所述接地端GND。所述第二N型金属-氧化物-半导体晶体管Q2的漏极D2电性耦接至所述二极管D1的阳极。所述致能端EN电性耦接至所述第一N型金属-氧化物-半导体晶体管Q1的漏极D1。当所述致能端EN为高电平时,所述控制单元160被致能(enabled)而能正常工作,亦即所述控制单元160控制所述电源模块10提供所述驱动电流ID给所述发光二极管灯条30、32;当所述致能端EN为低电平时,所述控制单元160被除能(disable)而停止工作,亦即所述控制单元160控制所述电源模块10停止提供所述驱动电流ID给所述发光二极管灯条30、32。所述控制端P2-P7将于稍后详述。
图2的实施例中包括两个发光二极管灯条30、32,于其他实施例中,发光二极管灯条30、32的数量不限。
所述两个发光二极管灯条30、32并联耦接。发光二极管灯条30、32各包括若干个发光二极管LED串联耦接,这些串联耦接的发光二极管LED具有正极端LED+以及负极端LED-。每一发光二极管LED具有一阳极以及一阴极。于发光二极管灯条30中,第一个发光二极管LED的阳极电性耦接至所述发光元件P的阴极,亦即所述正极端LED+电性耦接至所述发光元件P的阴极,最候一个发光二极管LED的阴极电性耦接至一第三N型金属-氧化物-半导体晶体管Q3的漏极D3,亦即所述负极端LED-电性耦接至所述第三N型金属-氧化物-半导体晶体管Q3的漏极D3。所述第三N型金属-氧化物-半导体晶体管Q3的闸极G3、源极S3及漏极D3分别电性耦接至所述控制单元160的控制端P2-P4。
类似地,于发光二极管灯条32中,第一个发光二极管LED的阳极电性耦接至所述发光元件P的阴极,亦即所述正极端LED+电性耦接至所述发光元件P的阴极,最候一个发光二极管LED的阴极电性耦接至一第四N型金属-氧化物-半导体晶体管Q4的漏极D4,亦即所述负极端LED-电性耦接至所述第四N型金属-氧化物-半导体晶体管Q4的漏极D4。所述第四N型金属-氧化物-半导体晶体管Q4的闸极G4、源极S4及漏极D4分别电性耦接至所述控制单元160的控制端P5-P7。
由上述可知,控制单元160可以用于控制所述第三N型金属-氧化物-半导体晶体管Q3及第四N型金属-氧化物-半导体晶体管Q4的导通与不导通。
以下详述图2的背光驱动电路1的工作原理。
流经所述发光元件P的驱动电流ID等于流经所述发光二极管灯条30的电流I1及流经所述发光二极管灯条32的电流I2的总和。根据所述光电耦合器120的特性,驱动电流ID等于β
ISW,β为电流传输率(Current Transfer
Ratio;CTR)的倒数,电流传输率等于ISW/ID,ISW为流经所述开关元件SW的电流。流经所述开关元件SW的电流ISW的最大值为VREF/R4,因此流经所述发光元件P的驱动电流ID的最大值为β
VREF/R4,为了达到所述保护背光驱动电路1及发光二极管灯条30、32的目的,可以通过预先设定第四电阻R4的值及参考电压VREF的值达到限定流经所述发光元件P的驱动电流ID的最大值。
当流经所述发光元件P的驱动电流ID大于β
VREF/R4时,节点A的转换电压VA会大于所述参考电压VREF,所述运算放大器OP的输出端O为高电平,所述第一N型金属-氧化物-半导体晶体管Q1导通,所述第一N型金属-氧化物-半导体晶体管Q1的漏极D1变成低电平,低电平将会使所述控制单元160停止工作(亦即除能),达到保护背光驱动电路1及发光二极管灯条30、32的目的。更明确地说,所述控制单元160通过控制端P1、P8控制所述第二N型金属-氧化物-半导体晶体管Q2不导通,进而使所述电源模块10停止提供所述驱动电流ID给所述发光二极管灯条30、32。
当流经所述发光元件P的驱动电流ID小于β
VREF/R4时,节点A的转换电压VA会小于所述参考电压VREF,所述运算放大器OP的输出端O为高电平,所述第一N型金属-氧化物-半导体晶体管Q1不导通,所述第一N型金属-氧化物-半导体晶体管Q1的漏极D1变成高电平,高电平将会使所述控制单元160正常工作(亦即致能)。更明确地说,所述控制单元160通过控制端P1、P8控制所述第二N型金属-氧化物-半导体晶体管Q2导通,进而使所述电源模块10提供所述驱动电流ID给所述发光二极管灯条30、32。
此外,所述控制单元160能通过控制端P2-P4控制所述发光二极管灯条30的第三N型金属-氧化物-半导体晶体管Q3的导通与不导通,进而控制所述发光二极管灯条30的操作。所述控制单元160能通过控制端P5-P7控制所述发光二极管灯条32的第四N型金属-氧化物-半导体晶体管Q4的导通与不导通,进而控制所述发光二极管灯条32的操作。
于另一实施例中,N型金属-氧化物-半导体晶体管Q1-Q4可以用P型金属-氧化物-半导体晶体管代替。
此外,本发明进一步提供一种液晶显示装置,所述液晶显示装置包括上述背光驱动电路1。
本发明的背光驱动电路及液晶显示装置能限定流过发光二极管灯条的驱动电流,当驱动电流大于预设的最大值时,控制模块能控制电源模块停止提供驱动电流。
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 (11)
- 一种背光驱动电路,用于驱动至少一发光二极管灯条,所述背光驱动电路包括:一电源模块,用于提供一驱动电流给所述发光二极管灯条;一转换模块,电性耦接至所述电源模块,用于根据所述驱动电流产生一转换电压;一比较模块,电性耦接至所述转换模块,用于比较所述转换电压与一参考电压;以及一控制模块,电性耦接至所述电源模块、所述比较模块及所述发光二极管灯条,其中当所述转换电压大于所述参考电压时,所述控制模块控制所述电源模块停止提供所述驱动电流给所述发光二极管灯条,当所述转换电压小于所述参考电压时,所述控制模块控制所述电源模块提供所述驱动电流给所述发光二极管灯条。
- 根据权利要求1所述的背光驱动电路,其中所述转换模块包括:一光电耦合器,包括一发光元件以及一开关元件,所述发光元件电性耦接于所述电源模块及所述发光二极管灯条的正极端之间,用于传输所述驱动电流;以及一第一电阻,具有一第一端以及一第二端,所述开关元件电性耦接于一电压源及所述第一电阻的第一端之间,用于根据所述发光元件的发光强度输出一开关电流,所述转换电压为所述开关电流乘以所述第一电阻的电阻值。
- 根据权利要求2所述的背光驱动电路,其中所述比较模块包括:一运算放大器,包括一正相输入端、一反相输入端以及一输出端,所述正相输入端电性耦接至所述转换电压,所述反相输入端电性耦接至所述参考电压;以及一第一N型金属-氧化物-半导体晶体管,所述运算放大器的输出端电性耦接至所述第一N型金属-氧化物-半导体晶体管的闸极,所述第一N型金属-氧化物-半导体晶体管的源极电性耦接至一接地端,当所述转换电压大于所述参考电压时,所述运算放大器的输出端为高电平,所述第一N型金属-氧化物-半导体晶体管导通,所述第一N型金属-氧化物-半导体晶体管的漏极变成低电平,当所述转换电压小于所述参考电压时,所述运算放大器的输出端为低电平,所述第一N型金属-氧化物-半导体晶体管不导通,所述第一N型金属-氧化物-半导体晶体管的漏极变成高电平。
- 根据权利要求3所述的背光驱动电路,其中所述控制模块包括:一控制单元,具有一致能端以及若干个控制端,所述致能端电性耦接至所述第一N型金属-氧化物-半导体晶体管的漏极;以及一第二N型金属-氧化物-半导体晶体管,电性耦接至所述控制单元,当所述第一N型金属-氧化物-半导体晶体管的漏极变成低电平时,所述控制单元通过所述第二N型金属-氧化物-半导体晶体管控制所述电源模块停止提供所述驱动电流给所述发光二极管灯条,当所述第一N型金属-氧化物-半导体晶体管的漏极变成高电平时,所述控制单元通过所述第二N型金属-氧化物-半导体晶体管控制所述电源模块提供所述驱动电流给所述发光二极管灯条。
- 一种背光驱动电路,用于驱动至少一发光二极管灯条,所述背光驱动电路包括:一电源模块,用于提供一驱动电流给所述发光二极管灯条;一转换模块,电性耦接至所述电源模块,用于根据所述驱动电流产生一转换电压;一比较模块,电性耦接至所述转换模块,用于比较所述转换电压与一参考电压;以及一控制模块,电性耦接至所述电源模块、所述比较模块及所述发光二极管灯条,用于根据所述转换电压是否大于所述参考电压来控制所述电源模块是否提供所述驱动电流给所述发光二极管灯条。
- 根据权利要求5所述的背光驱动电路,其中当所述转换电压大于所述参考电压时,所述控制模块控制所述电源模块停止提供所述驱动电流给所述发光二极管灯条。
- 根据权利要求5所述的背光驱动电路,其中当所述转换电压小于所述参考电压时,所述控制模块控制所述电源模块提供所述驱动电流给所述发光二极管灯条。
- 根据权利要求5所述的背光驱动电路,其中所述转换模块包括:一光电耦合器,包括一发光元件以及一开关元件,所述发光元件电性耦接于所述电源模块及所述发光二极管灯条的正极端之间,用于传输所述驱动电流;以及一第一电阻,具有一第一端以及一第二端,所述开关元件电性耦接于一电压源及所述第一电阻的第一端之间,用于根据所述发光元件的发光强度输出一开关电流,所述转换电压为所述开关电流乘以所述第一电阻的电阻值。
- 根据权利要求8所述的背光驱动电路,其中所述比较模块包括:一运算放大器,包括一正相输入端、一反相输入端以及一输出端,所述正相输入端电性耦接至所述转换电压,所述反相输入端电性耦接至所述参考电压;以及一第一N型金属-氧化物-半导体晶体管,所述运算放大器的输出端电性耦接至所述第一N型金属-氧化物-半导体晶体管的闸极,所述第一N型金属-氧化物-半导体晶体管的源极电性耦接至一接地端,当所述转换电压大于所述参考电压时,所述运算放大器的输出端为高电平,所述第一N型金属-氧化物-半导体晶体管导通,所述第一N型金属-氧化物-半导体晶体管的漏极变成低电平,当所述转换电压小于所述参考电压时,所述运算放大器的输出端为低电平,所述第一N型金属-氧化物-半导体晶体管不导通,所述第一N型金属-氧化物-半导体晶体管的漏极变成高电平。
- 根据权利要求9所述的背光驱动电路,其中所述控制模块包括:一控制单元,具有一致能端以及若干个控制端,所述致能端电性耦接至所述第一N型金属-氧化物-半导体晶体管的漏极;以及一第二N型金属-氧化物-半导体晶体管,电性耦接至所述控制单元,当所述第一N型金属-氧化物-半导体晶体管的漏极变成低电平时,所述控制单元通过所述第二N型金属-氧化物-半导体晶体管控制所述电源模块停止提供所述驱动电流给所述发光二极管灯条,当所述第一N型金属-氧化物-半导体晶体管的漏极变成高电平时,所述控制单元通过所述第二N型金属-氧化物-半导体晶体管控制所述电源模块提供所述驱动电流给所述发光二极管灯条。
- 一种液晶显示装置,包括如权利要求5所述的一种背光驱动电路。
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CN105261345B (zh) * | 2015-11-30 | 2017-10-03 | 深圳市华星光电技术有限公司 | T‑con负载变化的电压控制电路、显示面板及显示装置 |
CN105679230B (zh) * | 2016-04-25 | 2019-08-16 | 京东方科技集团股份有限公司 | 一种显示驱动电路、其驱动方法及显示装置 |
CN106899297B (zh) * | 2017-01-17 | 2020-05-19 | 华中科技大学 | 一种基于忆阻器的ad转换电路 |
KR20190126873A (ko) * | 2017-03-17 | 2019-11-12 | 가부시키가이샤 한도오따이 에네루기 켄큐쇼 | 반도체 장치, 표시 장치, 및 전자 기기 |
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