WO2018133136A1 - 背光控制电路及电子装置 - Google Patents

背光控制电路及电子装置 Download PDF

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Publication number
WO2018133136A1
WO2018133136A1 PCT/CN2017/073421 CN2017073421W WO2018133136A1 WO 2018133136 A1 WO2018133136 A1 WO 2018133136A1 CN 2017073421 W CN2017073421 W CN 2017073421W WO 2018133136 A1 WO2018133136 A1 WO 2018133136A1
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WIPO (PCT)
Prior art keywords
voltage
feedback
terminal
resistor
led module
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Ceased
Application number
PCT/CN2017/073421
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English (en)
French (fr)
Inventor
李文东
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US15/526,288 priority Critical patent/US10140931B2/en
Publication of WO2018133136A1 publication Critical patent/WO2018133136A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • 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
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof
    • 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
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • G09G3/003—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background to produce spatial visual effects

Definitions

  • the present invention relates to a control circuit, and more particularly to a backlight control circuit and an electronic device having a backlight control circuit.
  • LEDs light-emitting diodes
  • Current electronic devices such as televisions, computer displays, etc. can often operate in 2D mode or 3D mode.
  • 3D mode the current flowing through the LED needs to be higher than in the 2D mode to provide sufficient backlight brightness in 3D mode. Therefore, when the electronic device operates in the three-dimensional mode, it is necessary to increase the current of the LED, and when the electronic device operates in the two-dimensional mode, it is necessary to reduce the current of the LED.
  • the existing circuit structure for realizing the LED current in the three-dimensional mode is complicated.
  • the present invention provides a backlight control circuit and an electronic device capable of improving a current flowing through an LED module as a backlight in a three-dimensional mode by a simple structure.
  • a backlight control circuit for adjusting current of an LED module of an electronic device, the LED module comprising a positive terminal, a ground terminal, and at least one LED lamp connected in series between the positive terminal and the ground terminal and detecting
  • the resistor wherein the backlight control circuit comprises: a driving chip, comprising: a feedback end, a reference voltage end and an output end, wherein the reference voltage end is connected to a reference voltage; and a feedback voltage adjusting unit is connected to the feedback end of the driving chip and Between the remote ends of the detecting resistor, a detection terminal voltage for adjusting a remote end of the detecting resistor is transmitted to a feedback terminal voltage of the feedback terminal; and a power adjusting unit coupled to the power a power supply circuit of the sub-device and a positive end of the LED module and connected to an output end of the driving chip, and configured to adjust a power supply voltage outputted by the power circuit to the LED module in response to control of the driving chip;
  • the feedback voltage adjustment unit is further connected to a 2D/3D signal end
  • the feedback voltage adjustment unit controls to decrease a feedback terminal voltage that is transmitted to the feedback terminal when the three-dimensional signal is received, so that the feedback The terminal voltage is less than the reference voltage
  • the driving chip controls the power supply adjusting unit to increase the power supply voltage to the LED module to increase the LED light flowing through the LED module when the feedback terminal voltage is less than the reference voltage.
  • the feedback voltage adjustment unit controls the feedback voltage of the remote end of the detection resistor to be transmitted to the feedback terminal of the feedback terminal when the two-dimensional signal is received, so that the feedback terminal voltage is greater than the reference voltage.
  • the control chip adjusts the power supply voltage of the LED module to reduce the current flowing through the LED lamp of the LED module.
  • the feedback voltage adjustment unit includes a first resistor, a second resistor, and a first switch tube, wherein the first resistor, the second resistor, and the first switch tube are sequentially connected in series to the remote end of the sense resistor and the ground
  • the feedback end of the driving chip is connected to the connection node of the first resistor and the second resistor, the gate of the first switch tube is connected to the 2D/3D signal end, the source is grounded, and the drain is The second resistor is connected.
  • the first switch tube receives the two-dimensional signal generated by the 2D/3D signal end, the first switch tube is turned off, and the branch of the first resistor and the second resistor is turned off, the feedback The terminal voltage is equal to the detection voltage of the detection resistor
  • the driving chip compares the feedback terminal voltage with the reference voltage, and controls the power supply regulation when the feedback terminal voltage is not equal to the reference voltage
  • the first switch tube is turned on when the first switch tube receives the three-dimensional signal generated by the 2D/3D signal end, so that the branch of the first resistor and the second resistor is turned on.
  • the feedback terminal voltage V1 Vf*R2/(R1+R2), where V1 is the feedback terminal voltage, Vf is the detection voltage of the remote end of the detection resistor, R1 is the resistance value of the first resistor, and R2 is the second resistor.
  • the three-dimensional signal is a high level signal
  • the two-dimensional signal is a low level signal
  • the first switching tube is a high level conduction switch
  • the first switching tube receives a high level at the gate
  • the three-dimensional signal is turned on, and is turned off when the gate receives a low-level two-dimensional signal.
  • the driving chip comprises a comparator and a PWM signal generator, a non-inverting input end of the comparator is connected to the reference voltage end, an inverting input end is connected to the feedback end, and an output end of the comparator Connected to the negative input terminal of the PWM signal generator, the positive input terminal of the PWM signal generator is connected to a positive voltage, and the output end of the PWM signal generator is used as an output terminal of the driving chip.
  • the power conditioning unit includes a second switch, the gate of the second switch is connected to the output of the PWM signal generator, the source is grounded, the drain is connected to the output of the power circuit, and The positive terminal of the LED module is coupled to the PWM signal generator for outputting a PWM signal to control the periodic on and off of the second switch, and adjusting the voltage output by the power circuit.
  • the second switch tube is a high level on switch.
  • the comparator When the feedback terminal voltage is less than the reference voltage, the comparator outputs a low level signal, and the PWM signal generator receives at a negative input end.
  • the control reduces the duty ratio of the output PWM signal, so that the on-time of the second switching transistor becomes shorter in one cycle, thereby increasing the output of the power circuit to the LED
  • the duty ratio of the power supply voltage of the module increases the power supply voltage outputted to the LED module; when the voltage at the feedback terminal is greater than the reference voltage, the comparator outputs a high level signal, and the PWM signal is generated.
  • the controller When receiving a high level signal at the negative input terminal, the controller controls to increase the duty ratio of the output PWM signal, so that the on-time of the switch tube becomes longer in one cycle, thereby reducing the power supply circuit
  • the duty cycle of the supply voltage output to the LED module reduces the supply voltage to the LED module.
  • the first switch tube and the second switch tube are NMOS tubes or NPN transistors.
  • An electronic device includes a power supply circuit, an LED module, and a backlight control circuit, wherein the power supply circuit is configured to output a power supply voltage, and the LED module includes a positive terminal, a ground terminal, and a series connection between the positive terminal and the ground terminal. At least one LED light and sense resistor.
  • the backlight control circuit includes: a driving chip, including a feedback end, a reference voltage end and an output end, wherein the reference voltage end is connected to a reference voltage; a feedback voltage adjusting unit is connected to the feedback end of the driving chip and the detecting resistor Between the remote ends, a detection terminal voltage for regulating the remote end of the detecting resistor is transmitted to the feedback terminal voltage of the feedback terminal; and a power adjusting unit coupled to the power supply circuit of the electronic device and the LED module Connected between the positive terminals and the output end of the driving chip for adjusting the power supply voltage outputted to the LED module in response to the control of the driving chip; wherein the feedback voltage adjusting unit is further coupled to a 2D/3D signal
  • the end connection is configured to receive a two-dimensional signal or a three-dimensional signal generated by the 2D/3D signal end, wherein the 2D/3D signal end generates a two-dimensional signal when the electronic device is in the two-dimensional mode, when the electronic device is in the three-dimensional mode Generating
  • the feedback voltage adjustment unit controls the feedback voltage of the remote end of the detection resistor to be transmitted to the feedback terminal of the feedback terminal when the two-dimensional signal is received, so that the feedback terminal voltage is greater than the reference voltage.
  • the control chip adjusts the power supply voltage of the LED module to reduce the current flowing through the LED lamp of the LED module.
  • the feedback voltage adjustment unit includes a first resistor, a second resistor, and a first switch tube, wherein the first resistor, the second resistor, and the first switch tube are sequentially connected in series to the remote end of the sense resistor and the ground
  • the feedback end of the driving chip is connected to the connection node of the first resistor and the second resistor, the gate of the first switch tube is connected to the 2D/3D signal end, the source is grounded, and the drain is The second resistor is connected.
  • the first switch tube receives the two-dimensional signal generated by the 2D/3D signal end, the first switch tube is turned off, and the branch of the first resistor and the second resistor is turned off, the feedback The terminal voltage is equal to the detection voltage of the detection resistor
  • the driving chip compares the feedback terminal voltage with the reference voltage, and controls the power supply regulation when the feedback terminal voltage is not equal to the reference voltage
  • the first switch tube is turned on when the first switch tube receives the three-dimensional signal generated by the 2D/3D signal end, so that the branch of the first resistor and the second resistor is turned on.
  • the feedback terminal voltage V1 Vf*R2/(R1+R2), where V1 is the feedback terminal voltage, Vf is the detection voltage of the remote end of the detection resistor, R1 is the resistance value of the first resistor, and R2 is the second resistor.
  • the three-dimensional signal is a high level signal
  • the two-dimensional signal is a low level signal
  • the first switching tube is a high level conduction switch
  • the first switching tube receives a high level at the gate
  • the three-dimensional signal is turned on, and is turned off when the gate receives a low-level two-dimensional signal.
  • the driving chip comprises a comparator and a PWM signal generator, a non-inverting input end of the comparator is connected to the reference voltage end, an inverting input end is connected to the feedback end, and an output end of the comparator Connected to the negative input terminal of the PWM signal generator, the positive input terminal of the PWM signal generator is connected to a positive voltage, and the output end of the PWM signal generator is used as an output terminal of the driving chip.
  • the power conditioning unit includes a second switch, the gate of the second switch is connected to the output of the PWM signal generator, the source is grounded, the drain is connected to the output of the power circuit, and The positive terminal of the LED module is coupled to the PWM signal generator for outputting a PWM signal to control the periodic on and off of the second switch, and adjusting the voltage output by the power circuit.
  • the second switch tube is a high level on switch.
  • the comparator When the feedback terminal voltage is less than the reference voltage, the comparator outputs a low level signal, and the PWM signal generator receives at a negative input end.
  • the control reduces the duty ratio of the output PWM signal, so that the on-time of the second switching transistor becomes shorter in one cycle, thereby increasing the output of the power circuit to the LED
  • the duty ratio of the power supply voltage of the module increases the power supply voltage outputted to the LED module; when the voltage at the feedback terminal is greater than the reference voltage, the comparator outputs a high level signal, and the PWM signal is generated.
  • the controller When receiving a high level signal at the negative input terminal, the controller controls to increase the duty ratio of the output PWM signal, so that the on-time of the switch tube becomes longer in one cycle, thereby reducing the power supply circuit
  • the duty cycle of the supply voltage output to the LED module reduces the supply voltage to the LED module.
  • the first switch tube and the second switch tube are NMOS tubes or NPN transistors.
  • the feedback voltage adjusting unit controls to reduce the feedback terminal voltage transmitted to the feedback end of the driving chip, so that the feedback terminal voltage of the feedback end of the driving chip is smaller than the reference voltage of the driving chip.
  • the reference voltage of the terminal when comparing the voltage of the feedback terminal to the reference voltage, controlling the power supply voltage to the LED module to increase the current flowing through the LED module to meet the requirement of the three-dimensional mode;
  • the backlight control circuit adopts a simple structure to increase the current flowing through the LED module when the electronic device is in the three-dimensional mode.
  • 1 is a block diagram of a module of an electronic device having a backlight control circuit
  • FIG. 2 is a detailed circuit diagram of the electronic device having the backlight control circuit shown in FIG. 1.
  • FIG. 1 is a block diagram of a module of an electronic device 100 (hereinafter referred to as an electronic device 100 ) according to the present invention.
  • the electronic device 100 includes a power supply circuit 10, an LED (light-emitting diode) module 20, a backlight control circuit 30, and a 2D/3D signal terminal 40.
  • the backlight control circuit 30 is configured to adjust the current of the LED module 20 of the electronic device 100.
  • the LED module 20 includes a positive terminal P+, a ground terminal P-, and at least one LED lamp L1 and a detecting resistor Rf connected in series between the positive terminal P+ and the ground terminal P-.
  • the backlight control circuit 30 includes a driving chip 31, a power adjusting unit 32, and a feedback voltage adjusting unit 33.
  • the driving chip 31 includes a feedback terminal P1, a reference voltage terminal P2, and an output terminal P3.
  • the feedback voltage adjusting unit 33 is connected between the feedback terminal P1 and the remote end N1 of the detecting resistor Rf.
  • the feedback voltage adjusting unit 33 is configured to adjust the detection voltage Vf of the remote terminal N1 of the detecting resistor Rf to the feedback terminal voltage V1 of the feedback terminal P1.
  • the reference voltage terminal P2 is used to access a reference voltage Vref.
  • the reference voltage Vref may be a voltage value that is fixed after the electronic device 100 is powered on, for example, 5 volts or the like.
  • the power conditioning unit 32 is coupled between the power circuit 10 and the positive terminal P+ of the LED module 20, and the power conditioning unit 3 is further connected to the driving chip 31 for responding to the driving chip 31.
  • the power supply voltage output from the power supply circuit 10 to the LED module 20 is controlled.
  • the driving chip 31 compares the feedback terminal voltage V1 of the feedback terminal P1 and the reference voltage Vref of the reference voltage terminal P2, and the driving chip 31 is configured to control the power source when the feedback terminal voltage V1 is smaller than the reference voltage Vref
  • the adjusting unit 32 increases the power supply voltage to the LED module 20, and when the feedback terminal voltage V1 is greater than the reference voltage Vref, the control power adjusting unit 32 lowers the power supply voltage to the LED module 20 until the feedback The terminal voltage V1 is equal to the reference voltage Vref.
  • the 2D/3D signal terminal 40 is configured to generate a corresponding two-dimensional signal or a three-dimensional signal when the electronic device 100 operates in a two-dimensional mode or a three-dimensional mode. That is, the 2D/3D signal terminal 40 generates a two-dimensional signal when the electronic device 100 operates in the two-dimensional mode, and generates a three-dimensional signal when the electronic device 100 operates in the three-dimensional mode.
  • the 2D/3D signal terminal 40 can be a pin of a processing unit (not shown). The processing unit outputs a corresponding two-dimensional signal through the 2D/3D signal terminal 40 according to the current working mode of the electronic device 100. Signal or three-dimensional signal.
  • the feedback voltage adjusting unit 33 is connected to the 2D/3D signal terminal 40 for controlling the detection voltage Vf of the remote terminal N1 of the detecting resistor Rf to be transmitted to the feedback terminal when receiving the three-dimensional signal.
  • the feedback terminal voltage V1 of P1 is such that the feedback terminal voltage V1 is smaller than the reference voltage Vref. Therefore, when the feedback terminal voltage V1 is less than the reference voltage Vref, the control power supply adjusting unit 32 increases the power supply voltage to the LED module 20 to increase the current flowing through the LED module 20. That is, the current flowing through the LED lamp L1 and the feedback resistor Rf of the LED module 20 is increased.
  • the power supply voltage of the LED module 20 increases, correspondingly, the current flowing through the LED module 20 also increases, thereby satisfying the requirement that the LED lamp L1 needs a larger current when the electronic device 100 operates in the three-dimensional mode.
  • the feedback voltage adjustment unit 33 controls the detection terminal V1 of the remote terminal N1 of the detection resistor Rf to be transmitted to the feedback terminal voltage V1 of the feedback terminal P1 when the two-dimensional signal is received, so that the The feedback terminal voltage V1 is greater than the reference voltage Vref. Therefore, when the feedback terminal voltage V1 is greater than the reference voltage Vref, the control power supply adjusting unit 32 lowers the power supply voltage to the LED module 20 to reduce the current flowing through the LED lamp, that is, reduce the flow. The current of the LED lamp L1 and the feedback resistor Rf of the LED module 20 is passed.
  • the power supply voltage of the LED module 20 is lowered, correspondingly, the current flowing through the LED module 20 is also reduced, thereby satisfying the requirement of only lower current of the LED lamp in the two-dimensional mode, and avoiding continuing to be large.
  • the current supplies power to the LED module 20, saving power.
  • the electronic device 100 further includes a rectifying and filtering circuit 50 , and the rectifying and filtering circuit 50 is coupled between the power adjusting unit 32 and the positive terminal P+ of the LED module 20 for The power supply voltage adjusted by the power conditioning unit 32 is rectified and filtered.
  • the feedback voltage adjusting unit 33 includes a first resistor R1, a second resistor R2, and a first switching transistor Q1.
  • the first resistor R1, the second resistor R2, and the first switching transistor Q1 are sequentially connected in series between the remote end N1 of the detecting resistor Rf and the ground.
  • the feedback terminal P1 of the driving chip 31 is connected to the connection node N2 of the first resistor R1 and the second resistor R2.
  • the gate of the first switch Q1 is connected to the 2D/3D signal terminal 40, the source is grounded, and the drain is connected to the second resistor R2.
  • the first switch tube Q1 receives the 2D/3D signal
  • the two-dimensional signal generated by the terminal 40 is turned off, and is turned on when the three-dimensional signal generated by the 2D/3D signal terminal 40 is received.
  • the branch of the first resistor R1 and the second resistor R2 is turned off because the first switch transistor Q1 is turned off.
  • the detection voltage Vf of the detection resistor Rf is equal to the feedback terminal voltage V1. That is, at this time, the feedback voltage adjusting unit 33 adjusts the feedback terminal voltage V1 of the detection terminal V1 of the detection terminal R1 to the feedback terminal P1 to be equal to the detection voltage Vf.
  • the driving chip 31 compares the feedback terminal voltage V1 with the reference voltage Vref, and controls the power supply regulation when comparing the feedback terminal voltage V1 and the reference voltage Vref.
  • the unit 32 adjusts the supply voltage output to the LED module 20 until the feedback terminal voltage V1 is equal to the reference voltage Vref.
  • the detection voltage Vf on the detection resistor Rf also changes, that is, the feedback terminal voltage V1 also changes.
  • the driving chip 31 controls the power conditioning unit 32 to maintain the current supply voltage to the LED module 20.
  • the first switch Q1 receives the three-dimensional signal generated by the 2D/3D signal terminal 40, since the first switch Q1 is turned on, the first resistor R1 and the second resistor R2 are in the branch path. through.
  • the detection voltage Vf is equal to the reference voltage Vref before the first switching transistor Q1 receives the three-dimensional signal, and thus, when the first switching transistor Q1 receives the three-dimensional signal being turned on, At this time, the feedback terminal voltage V1 will be smaller than the reference voltage Vref.
  • the first switch tube Q1 receives the two-dimensional signal generated by the 2D/3D signal terminal 40 and turns off, and the feedback terminal voltage V1. Will be directly equal to the detection voltage Vf. And, at the time of switching, the detection voltage Vf is a voltage (R1+R2)*Vref/R2 in the three-dimensional mode, which is larger than the reference voltage Vref. Therefore, as described above, the driving chip 31 controls the power adjusting unit 32 to reduce the power supply voltage outputted to the LED module 20 until the voltage V1 at the feedback terminal drops to be equal to the reference voltage. Vref.
  • the detection voltage Vf of the remote terminal N1 of the detecting resistor Rf is adjusted by the feedback voltage adjusting unit 33 to be transmitted to the feedback terminal P1.
  • the feedback terminal voltage can reduce the current flowing through the LED module 20 in a two-dimensional mode or increase the current flowing through the LED module 20 in a three-dimensional mode.
  • the resistance relationship between the resistors R1 and R2 can be set according to the needs of the electronic device 100. Set. For example, when the current flowing through the LED module 20 in the three-dimensional mode of the electronic device 100 needs to be twice as large as in the two-dimensional mode, the values of the resistor R1 and the resistor R2 may be set to be equal, for example, 100 ohms.
  • the three-dimensional signal is a high level signal
  • the two-dimensional signal is a low level signal
  • the first switching transistor Q1 is a high level conduction switch, such as an NMOS transistor, the first switch The tube Q1 is turned on when the gate receives a high-level three-dimensional signal, and is turned off when the gate receives a low-level two-dimensional signal.
  • the driving chip 31 includes a comparator 311 and a PWM (Pulse-Width Modulation) signal generator 312.
  • the inverting input terminal S1 of the comparator 311 is connected to the feedback terminal P1, and the non-inverting input terminal S2 is connected to the reference voltage terminal P2.
  • the output terminal O1 of the comparator 311 is connected to the negative input terminal F1 of the PWM signal generator 312, and the positive input terminal F2 of the PWM signal generator 312 is connected to a positive voltage V+.
  • the positive voltage V+ is also a voltage that is fixed after the electronic device 100 is powered on, for example, 3 volts or the like.
  • the power conditioning unit 32 includes a second switching transistor Q2.
  • the gate of the second switch Q2 is connected to the output end O2 of the PWM signal generator 312, the source is grounded, the drain is connected to the output terminal OUT1 of the power supply circuit 10 and the positive terminal of the LED module 20 P+ is coupled.
  • the output terminal O2 of the PWM signal generator 312 serves as the output terminal P3 of the driving chip 31.
  • the PWM signal generator 312 is configured to control the voltage of the power circuit 10 to be regulated by controlling the output of the PWM signal by the output terminal O2 to control the second switch tube Q2 to be turned on and off periodically.
  • the first switching transistor Q1 When the first switching transistor Q1 receives the two-dimensional signal generated by the 2D/3D signal terminal 40 and is turned off, due to the virtual short-short nature of the comparator 311, no current flows through the first resistor R1. At this time, the feedback terminal voltage V1 of the feedback terminal P1 is equal to the detection voltage Vf of the connection node N1.
  • the second switching transistor Q2 is a high-level conduction switch, such as an NMOS transistor.
  • the comparator 311 compares the feedback terminal voltage V1 with the reference voltage Vref, and compares the feedback When the terminal voltage V1 is smaller than the reference voltage, the comparator 311 outputs a low level signal.
  • the PWM signal generator 312 controls to lower the duty ratio of the output PWM signal when the negative input terminal F1 receives the low level signal, so that the second switching transistor Q2 is turned on in one cycle. The shortening increases the duty ratio of the power supply voltage outputted by the power supply circuit 10 to the LED module 20, and increases the power supply voltage output to the LED module 20.
  • the comparator 311 outputs a high level signal when the comparator 311 compares the feedback terminal voltage V1 to be greater than the reference voltage.
  • the negative input terminal F1 of the PWM signal generator 312 controls to increase the duty ratio of the output PWM signal, so that the second switch tube Q2 is turned on in one cycle. The length is increased, thereby reducing the duty ratio of the power supply voltage outputted by the power supply circuit 10 to the LED module 20, and reducing the power supply voltage output to the LED module 20.
  • the feedback terminal voltage V1 of the feedback terminal P1 is equal to the detection voltage Vf in the two-dimensional mode, it is equal to Vf*R2/(R1+R2) in the three-dimensional mode, and therefore, the feedback terminal voltage V1 and the detection The voltage Vf is always in a positive proportional relationship.
  • the detection voltage Vf also increases, and similarly, the feedback terminal voltage V1 also increases.
  • the detection voltage Vf also decreases, and similarly, the feedback terminal voltage V1 also decreases.
  • the comparator 311 compares the feedback terminal voltage V1 to be smaller than the reference voltage Vref, the feedback terminal voltage V1 will be adjusted to increase until it is equal to the reference voltage Vref.
  • the comparator 311 compares the feedback terminal voltage V1 to be greater than the reference voltage, the feedback terminal voltage V1 will be adjusted to decrease until equal to the reference voltage Vref.
  • the reference voltage Vref is a fixed value
  • the detection voltage Vf is equal to the feedback terminal voltage V1 is equal to the reference voltage Vref, and at this time, flows through the LED module 20.
  • the current I L of the LED lamp L1 is Vref/Rf.
  • the rectifying and filtering circuit 50 includes a diode D1 and a first capacitor C1.
  • the anode of the pole D1 is connected to the drain of the second switch Q2, the cathode is connected to one end of the first capacitor C1 and the anode terminal P+ of the LED, and the other end of the first capacitor C1 is grounded.
  • the power supply circuit 10 and the power conditioning unit 32 further include a second capacitor C2 and an inductor G1, and the second capacitor C2 and the inductor G1 are used to output the voltage output from the power circuit 10. Filtering and voltage regulation.
  • the power supply circuit 10 may include a voltage conversion circuit or the like for connecting a voltage of a commercial power source or a battery and converting the accessed voltage into a power supply voltage suitable for the electronic device 100.
  • the electronic device 100 can be a liquid crystal display, a liquid crystal television with a liquid crystal display, a computer, a mobile phone, or the like.
  • the first switch tube Q1 and the second switch tube Q2 of the present invention may also be replaced by an NPN transistor.
  • the first switch tube Q1 and the second switch tube Q2 may also be a PMOS tube or a PNP transistor.

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Abstract

一种背光控制电路（30）和电子装置（100），在电子装置（100）处于三维模式时能提高LED模组（20）的电流。背光控制电路（30）用于对电子装置（100）的LED模组（20）的电流进行调节，包括具有反馈端（P1）及参考电压端（P2）的驱动芯片（31）、反馈电压调节单元（33）及电源调节单元（32）；反馈电压调节单元（33）连接于反馈端（P1）及LED模组（20）的检测电阻（Rf）的远地端（N1）之间，用于调节检测电阻（Rf）的远地端（N1）的检测电压传递至反馈端（P1）的反馈端电压；反馈电压调节单元（33）还与2D/3D信号端（40）连接，在接收到2D/3D信号端（40）产生的三维信号时，控制调低反馈端电压，使得驱动芯片（31）的反馈端（P1）的反馈端电压低于参考电压端（P2）的参考电压（Vref），以触发驱动芯片（31）控制电源调节单元（32）调高对LED模组（20）的供电电压，增大流过LED模组（20）的电流。

Description

背光控制电路及电子装置
本发明要求2017年01月19日递交的发明名称为“背光控制电路及电子装置”的申请号201710039158.3的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及一种控制电路，特别涉及一种背光控制电路及具有背光控制电路的电子装置。
背景技术
目前使用LED(发光二极管，light-emitting diode)作为背光源的电子装置越来越多。目前的电子装置例如电视机、电脑显示屏等往往能工作在二维模式(2D Mode)或三维模式(3D Mode)。目前，在三维模式中，流过LED的电流需要比二维模式中要高才能在三维模式下提供足够的背光亮度。因此，当电子装置工作在三维模式时，需要提高LED的电流，而当电子装置工作在二维模式时，需要降低LED的电流。然而，现有的实现在三维模式中提高LED电流的电路结构较为复杂。
发明内容
本发明提供一种背光控制电路及电子装置，能够通过简单的结构实现在三维模式中提升流过作为背光源的LED模组的电流。
一种背光控制电路，用于对一电子装置的LED模组的电流进行调节，所述LED模组包括正极端、接地端、以及串联于正极端、接地端之间的至少一个LED灯及检测电阻，其中，所述背光控制电路包括：驱动芯片，包括反馈端、参考电压端及输出端，所述参考电压端连接一参考电压；反馈电压调节单元，连接于所述驱动芯片的反馈端及所述检测电阻的远地端之间，用于调节所述检测电阻的远地端的检测电压传递至所述反馈端的反馈端电压；以及电源调节单元，耦接于电 子装置的电源电路以及所述LED模组的正极端之间且与所述驱动芯片的输出端连接，用于响应驱动芯片的控制而调节电源电路输出至LED模组的供电电压；其中，所述反馈电压调节单元还与一2D/3D信号端连接，用于接收所述2D/3D信号端产生的二维信号或三维信号，其中，该2D/3D信号端在电子装置处于二维模式时产生二维信号，在电子装置处于三维模式时产生三维信号；所述反馈电压调节单元在接收到三维信号时，控制调低所述检测电压传递至所述反馈端的反馈端电压，使得所述反馈端电压小于所述参考电压，所述驱动芯片在所述反馈端电压小于所述参考电压时，控制电源调节单元调高对LED模组的供电电压，以增大流过LED模组的LED灯的电流。
其中，所述反馈电压调节单元在接收到二维信号时，控制调高所述检测电阻的远地端的检测电压传递至所述反馈端的反馈端电压，使得所述反馈端电压大于所述参考电压，所述驱动芯片在所述反馈端电压大于所述参考电压时，控制电源调节单元调低对LED模组的供电电压，以降低流过LED模组的LED灯的电流。
其中，所述反馈电压调节单元包括第一电阻、第二电阻及第一开关管，所述第一电阻、第二电阻及第一开关管依次串联于所述检测电阻的远地端及地之间，所述驱动芯片的反馈端与所述第一电阻、第二电阻的连接节点连接，所述第一开关管的栅极与所述2D/3D信号端连接，源极接地，漏极与所述第二电阻连接。
其中，当所述第一开关管接收到所述2D/3D信号端产生的二维信号时，所述第一开关管截止，所述第一电阻及第二电阻所在支路截止，所述反馈端电压等于所述检测电阻的检测电压，所述驱动芯片将所述反馈端电压与所述参考电压进行比较，并在所述反馈端电压与所述参考电压不相等时，控制所述电源调节单元调节输出至LED模组的供电电压，直到反馈端电压与所述参考电压相等时，控制所述电源调节单元维持当前输出至LED模组的供电电压，以使得流过LED模组的LED灯及检测电阻的电流维持在IL＝Vref/Rf，其中，Vref为参考电压，Rf为检测电阻的电阻值。
其中，当所述第一开关管接收到所述2D/3D信号端产生的三维信号时，所述第一开关管导通，以使得所述第一电阻及第二电阻所在支路导通，此时反馈端 电压V1＝Vf*R2/(R1+R2)，其中，V1为反馈端电压，Vf为检测电阻的远地端的检测电压，R1为第一电阻的电阻值，R2为第二电阻的电阻值，所述驱动芯片在所述反馈端电压与所述参考电压不相等时，控制所述电源调节单元调节输出至LED模组的供电电压，直到反馈端电压与所述参考电压相等时，控制所述电源调节单元维持当前输出至LED模组的供电电压，以使得流过LED模组的的LED灯及检测电阻的电流维持在IL＝Vf/Rf＝(R1+R2)*Vref/(R2*Rf)，其中，Vref为参考电压，Rf为检测电阻的电阻值。
其中，所述三维信号为高电平信号，二维信号为低电平信号，所述第一开关管为高电平导通开关，所述第一开关管在栅极接收到高电平的三维信号时导通，以及在栅极接收到低电平的二维信号时截止。
其中，所述驱动芯片包括比较器及PWM信号产生器，所述比较器的正相输入端与所述参考电压端连接，反相输入端与所述反馈端连接，所述比较器的输出端与所述PWM信号产生器的负极输入端连接，所述PWM信号产生器的正极输入端连接一正电压，所述PWM信号发生器的输出端作为驱动芯片的输出端。
其中，所述电源调节单元包括一第二开关管，所述第二开关管的栅极与所述PWM信号产生器的输出端连接，源极接地，漏极与所述电源电路的输出端及所述LED模组的正极端耦接，所述PWM信号产生器用于输出PWM信号控制所述第二开关管周期性的导通截止，而对所述电源电路输出的电压进行调节。
其中，所述第二开关管为高电平导通开关，在所述反馈端电压小于所述参考电压时，所述比较器输出低电平信号，所述PWM信号产生器在负极输入端接收到低电平信号时，控制调低所输出的PWM信号的占空比，以使得所述第二开关管在一个周期内的导通时间变短，从而增大了所述电源电路输出至LED模组的供电电压的占空比，增大了输出至LED模组的供电电压；在所述反馈端电压大于所述参考电压时，所述比较器输出高电平信号，所述PWM信号产生器在负极输入端接收到高电平信号时，控制调高所输出的PWM信号的占空比，以使得所述开关管在一个周期内的导通时间变长，从而降低了所述电源电路输出至LED模组的供电电压的占空比，降低了输出至LED模组的供电电压。
其中，所述第一开关管及第二开关管为NMOS管或NPN三极管。
一种电子装置，包括电源电路、LED模组以及背光控制电路，所述电源电路用于输出电源电压，所述LED模组包括正极端、接地端、以及串联于正极端、接地端之间的至少一个LED灯及检测电阻。所述背光控制电路包括：驱动芯片，包括反馈端、参考电压端及输出端，所述参考电压端连接一参考电压；反馈电压调节单元，连接于所述驱动芯片的反馈端及所述检测电阻的远地端之间，用于调节所述检测电阻的远地端的检测电压传递至所述反馈端的反馈端电压；以及电源调节单元，耦接于电子装置的电源电路以及所述LED模组的正极端之间且与所述驱动芯片的输出端连接，用于响应驱动芯片的控制而调节电源电路输出至LED模组的供电电压；其中，所述反馈电压调节单元还与一2D/3D信号端连接，用于接收所述2D/3D信号端产生的二维信号或三维信号，其中，该2D/3D信号端在电子装置处于二维模式时产生二维信号，在电子装置处于三维模式时产生三维信号；所述反馈电压调节单元在接收到三维信号时，控制调低所述检测电压传递至所述反馈端的反馈端电压，使得所述反馈端电压小于所述参考电压，所述驱动芯片在比较所述反馈端电压小于所述参考电压时，控制电源调节单元调高对LED模组的供电电压，以增大流过LED模组的LED灯的电流。
其中，所述反馈电压调节单元在接收到二维信号时，控制调高所述检测电阻的远地端的检测电压传递至所述反馈端的反馈端电压，使得所述反馈端电压大于所述参考电压，所述驱动芯片在所述反馈端电压大于所述参考电压时，控制电源调节单元调低对LED模组的供电电压，以降低流过LED模组的LED灯的电流。
其中，所述反馈电压调节单元包括第一电阻、第二电阻及第一开关管，所述第一电阻、第二电阻及第一开关管依次串联于所述检测电阻的远地端及地之间，所述驱动芯片的反馈端与所述第一电阻、第二电阻的连接节点连接，所述第一开关管的栅极与所述2D/3D信号端连接，源极接地，漏极与所述第二电阻连接。
其中，当所述第一开关管接收到所述2D/3D信号端产生的二维信号时，所述第一开关管截止，所述第一电阻及第二电阻所在支路截止，所述反馈端电压等于所述检测电阻的检测电压，所述驱动芯片将所述反馈端电压与所述参考电压进 行比较，并在所述反馈端电压与所述参考电压不相等时，控制所述电源调节单元调节输出至LED模组的供电电压，直到反馈端电压与所述参考电压相等时，控制所述电源调节单元维持当前输出至LED模组的供电电压，以使得流过LED模组的LED灯及检测电阻的电流维持在IL＝Vref/Rf，其中，Vref为参考电压，Rf为检测电阻的电阻值。
其中，当所述第一开关管接收到所述2D/3D信号端产生的三维信号时，所述第一开关管导通，以使得所述第一电阻及第二电阻所在支路导通，此时反馈端电压V1＝Vf*R2/(R1+R2)，其中，V1为反馈端电压，Vf为检测电阻的远地端的检测电压，R1为第一电阻的电阻值，R2为第二电阻的电阻值，所述驱动芯片在所述反馈端电压与所述参考电压不相等时，控制所述电源调节单元调节输出至LED模组的供电电压，直到反馈端电压与所述参考电压相等时，控制所述电源调节单元维持当前输出至LED模组的供电电压，以使得流过LED模组的的LED灯及检测电阻的电流维持在IL＝Vf/Rf＝(R1+R2)*Vref/(R2*Rf)，其中，Vref为参考电压，Rf为检测电阻的电阻值。
其中，所述三维信号为高电平信号，二维信号为低电平信号，所述第一开关管为高电平导通开关，所述第一开关管在栅极接收到高电平的三维信号时导通，以及在栅极接收到低电平的二维信号时截止。
其中，所述驱动芯片包括比较器及PWM信号产生器，所述比较器的正相输入端与所述参考电压端连接，反相输入端与所述反馈端连接，所述比较器的输出端与所述PWM信号产生器的负极输入端连接，所述PWM信号产生器的正极输入端连接一正电压，所述PWM信号发生器的输出端作为驱动芯片的输出端。
其中，所述电源调节单元包括一第二开关管，所述第二开关管的栅极与所述PWM信号产生器的输出端连接，源极接地，漏极与所述电源电路的输出端及所述LED模组的正极端耦接，所述PWM信号产生器用于输出PWM信号控制所述第二开关管周期性的导通截止，而对所述电源电路输出的电压进行调节。
其中，所述第二开关管为高电平导通开关，在所述反馈端电压小于所述参考电压时，所述比较器输出低电平信号，所述PWM信号产生器在负极输入端接收 到低电平信号时，控制调低所输出的PWM信号的占空比，以使得所述第二开关管在一个周期内的导通时间变短，从而增大了所述电源电路输出至LED模组的供电电压的占空比，增大了输出至LED模组的供电电压；在所述反馈端电压大于所述参考电压时，所述比较器输出高电平信号，所述PWM信号产生器在负极输入端接收到高电平信号时，控制调高所输出的PWM信号的占空比，以使得所述开关管在一个周期内的导通时间变长，从而降低了所述电源电路输出至LED模组的供电电压的占空比，降低了输出至LED模组的供电电压。
其中，所述第一开关管及第二开关管为NMOS管或NPN三极管。
本发明的电子装置及背光控制电路，在电子装置进入三维模式时，反馈电压调节单元控制降低传输至驱动芯片的反馈端的反馈端电压，使得驱动芯片的反馈端的反馈端电压小于驱动芯片的参考电压端的参考电压，所述驱动芯片在比较所述反馈端电压小于所述参考电压时，控制调高对LED模组的供电电压，提升流过LED模组的电流，以符合三维模式的需求；该背光控制电路采用简单的结构实现在电子装置处于三维模式时，提升流过LED模组的电流。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是具有背光控制电路的电子装置的模块架构图；
图2是图1所示的具有背光控制电路的电子装置的具体电路图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性 劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参阅图1，为本发明的电子装置100(以下称为电子装置100)的模块架构图。该电子装置100包括电源电路10、LED(light-emitting diode，发光二极管)模组20、背光控制电路30以及2D/3D信号端40。所述背光控制电路30用于对电子装置100的LED模组20的电流进行调节。
该LED模组20包括正极端P+、接地端P-、以及串联于正极端P+、接地端P-之间的至少一个LED灯L1及检测电阻Rf。
所述背光控制电路30包括驱动芯片31、电源调节单元32及反馈电压调节单元33。所述驱动芯片31包括反馈端P1、参考电压端P2及输出端P3。所述反馈电压调节单元33连接于所述反馈端P1及所述检测电阻Rf的远地端N1之间。所述反馈电压调节单元33用于调节所述检测电阻Rf的远地端N1的检测电压Vf传递至所述反馈端P1的反馈端电压V1。所述参考电压端P2用于接入一参考电压Vref。其中，所述参考电压Vref可为电子装置100上电后固定提供的一电压值，例如5伏等。
所述电源调节单元32耦接于所述电源电路10以及所述LED模组20的正极端P+之间，同时，所述电源调节单元3还与驱动芯片31连接，用于响应驱动芯片31的控制而调节电源电路10输出至LED模组20的供电电压。
所述驱动芯片31比较所述反馈端P1的反馈端电压V1以及参考电压端P2的参考电压Vref，所述驱动芯片31用于在所述反馈端电压V1小于所述参考电压Vref时，控制电源调节单元32调高对LED模组20的供电电压，以及在所述反馈端电压V1大于所述参考电压Vref时，控制电源调节单元32调低对LED模组20的供电电压，直到所述反馈端电压V1等于所述参考电压Vref为止。
所述2D/3D信号端40用于在电子装置100工作在二维模式或三维模式时产生相应的二维信号或三维信号。即，所述2D/3D信号端40在电子装置100工作在二维模式时产生二维信号，以及在电子装置100工作在三维模式时产生三维信号。其中，该2D/3D信号端40可为一处理单元(图中未示)的引脚，该处理单元根据电子装置100当前的工作模式而通过该2D/3D信号端40输出相应的二维 信号或三维信号。
所述反馈电压调节单元33与所述2D/3D信号端40连接，用于在接收到三维信号时，控制调低所述检测电阻Rf的远地端N1的检测电压Vf传递至所述反馈端P1的反馈端电压V1，使得所述反馈端电压V1小于所述参考电压Vref。从而，所述驱动芯片31在所述反馈端电压V1小于所述参考电压Vref时，控制电源调节单元32调高对LED模组20的供电电压，以增大流过LED模组20的电流，即增大流过LED模组20的LED灯L1及反馈电阻Rf的电流。由于，LED模组20的供电电压提高，相应的，所述LED模组20流过的电流也增加，从而满足了电子装置100工作在三维模式下时LED灯L1需要更大电流的需求。
其中，所述反馈电压调节单元33在接收到二维信号时，控制调高所述检测电阻Rf的远地端N1的检测电压Vf传递至所述反馈端P1的反馈端电压V1，使得所述反馈端电压V1大于所述参考电压Vref。从而，所述驱动芯片31在所述反馈端电压V1大于所述参考电压Vref时，控制电源调节单元32调低对LED模组20的供电电压，以降低流过LED灯的电流，即降低流过LED模组20的LED灯L1及反馈电阻Rf的电流。由于，LED模组20的供电电压降低，相应的，所述LED模组20流过的电流也降低，从而，满足二维模式下LED灯的仅需更低电流的需求，避免了继续以大电流对LED模组20供电，节约电能。
如图1所示，所述电子装置100还包括整流滤波电路50，所述整流滤波电路50耦接于所述电源调节单元32及LED模组20的正极端P+之间，用于对所述电源调节单元32调节后的供电电压进行整流滤波。
请参阅图2，为本发明较佳实施方式中的电子装置100的具体电路图。如图2所示，所述反馈电压调节单元33包括第一电阻R1、第二电阻R2及第一开关管Q1。所述第一电阻R1、第二电阻R2及第一开关管Q1依次串联于所述检测电阻Rf的远地端N1及地之间。所述驱动芯片31的反馈端P1与所述第一电阻R1、第二电阻R2的连接节点N2连接。
所述第一开关管Q1的栅极与所述2D/3D信号端40连接，源极接地，漏极与所述第二电阻R2连接。其中，所述第一开关管Q1在接收到所述2D/3D信号 端40产生的二维信号时截止，在接收到所述2D/3D信号端40产生的三维信号时导通。
当所述第一开关管Q1接收到所述2D/3D信号端40产生的二维信号时，由于第一开关管Q1截止，所述第一电阻R1及第二电阻R2所在支路截止。所述检测电阻Rf的检测电压Vf等于所述反馈端电压V1。即，此时，所述反馈电压调节单元33将所述检测电阻Rf的远地端N1的检测电压Vf传递至所述反馈端P1的反馈端电压V1调节至等于所述检测电压Vf。
如前所述，所述驱动芯片31将所述反馈端电压V1与所述参考电压Vref进行比较，并在比较所述反馈端电压V1与所述参考电压Vref不相等时，控制所述电源调节单元32调节输出至LED模组20的供电电压，直到反馈端电压V1与所述参考电压Vref相等为止。由于对LED模组20的供电电压变化，会引起所述检测电阻Rf上的检测电压Vf同样变化，即也会导致反馈端电压V1变化，当反馈端电压V1等于所述参考电压Vref时，此时达到平衡状态，所述驱动芯片31控制所述电源调节单元32维持当前输出至LED模组20的供电电压。此时，由于反馈端电压V1等于所述参考电压Vref以及所述检测电压Vf，流过LED模组20的LED灯L1及检测电阻Rf的电流IL也会维持在IL＝Vref/Rf。
当所述第一开关管Q1接收到所述2D/3D信号端40产生的三维信号时，由于此时第一开关管Q1导通，所述第一电阻R1及第二电阻R2所在支路导通。设第一电阻R1及第二电阻R2的电阻值分别为R1、R2，则此时反馈端电压V1＝Vf*R2/(R1+R2)，小于检测电压Vf。即，此时，所述反馈电压调节单元33将所述检测电阻Rf的远地端N1的检测电压Vf传递至所述反馈端P1的反馈端电压V1调节至等于所述Vf*R2/(R1+R2)。
由于在所述第一开关管Q1接收到所述三维信号之前，所述检测电压Vf等于所述参考电压Vref，从而，在所述第一开关管Q1接收到所述三维信号导通的时刻，此时所述反馈端电压V1将小于所述参考电压Vref。如前所述，所述驱动芯片31在比较所述反馈端电压V1小于所述参考电压Vref时，将控制所述电源调节单元32调高所述输出至所述LED模组20的供电电压，从而，会使得流过 所述LED灯L1及检测电阻Rf的电流上升，所述检测电压Vf也上升。由于所述反馈端电压V1＝Vf*R2/(R1+R2)，与所述检测电压Vf成正比例关系，所述反馈端电压V1也会上升。
所述驱动芯片31在所述反馈端电压V1上升至等于所述参考电压Vref时，控制所述电源调节单元32维持当前输出至LED模组20的供电电压。从而，此时检测电压Vf＝(R1+R2)*V1/R2＝(R1+R2)*Vref/R2。此时流过LED模组20的电流IL＝Vf/Rf＝(R1+R2)*Vref/(R2*Rf)，将大于二维模式下流过LED模组20的电流Vref/Rf。
从而，所述驱动芯片31在比较所述反馈端电压V1与所述参考电压Vref不相等时，控制所述电源调节单元32调节输出至LED模组20的供电电压，直到反馈端电压V1与所述参考电压Vref相等时，控制所述电源调节单元32维持当前输出至LED模组20的供电电压，以使得流过LED模组20的的LED灯L1及检测电阻Rf的电流维持在IL＝Vf/Rf＝(R1+R2)*Vref/(R2*Rf)。
显然，当所述电子装置100从三维模式切换到二维模式时，所述第一开关管Q1又接收到所述2D/3D信号端40产生的二维信号而截止，此时反馈端电压V1将直接等于所述检测电压Vf。而由于在切换的时刻，所述检测电压Vf为三维模式下的电压(R1+R2)*Vref/R2，大于所述参考电压Vref。从而，如前所述，所述驱动芯片31将控制所述电源调节单元32降低输出至所述LED模组20的供电电压，直到所述在所述反馈端电压V1下降至等于所述参考电压Vref。此时，由于反馈端电压V1等于所述参考电压Vref以及所述检测电压Vf，流过LED模组20的LED灯L1及检测电阻Rf的电流IL也会维持在二维模式下的电流IL＝Vref/Rf。
从而，本申请中，在电子装置100处于二维模式或三维模式时，通过所述反馈电压调节单元33调节所述检测电阻Rf的远地端N1的检测电压Vf传递至所述反馈端P1的反馈端电压，可在二维模式下减少流过LED模组20的电流或在三维模式下增大流过LED模组20的电流。
其中，所述电阻R1、R2的阻值关系可根据所述电子装置100的需要进行设 置。例如，当所述电子装置100在三维模式中流过LED模组20的电流需要是二维模式中的两倍，则所述电阻R1及电阻R2的值可设为相等，例如都为100欧姆。
在一些实施例中，所述三维信号为高电平信号，二维信号为低电平信号，所述第一开关管Q1为高电平导通开关，例如为NMOS管，所述第一开关管Q1在栅极接收到高电平的三维信号时导通，以及在栅极接收到低电平的二维信号时截止。
如图2所示，所述驱动芯片31包括比较器311及PWM(Pulse-Width Modulation，脉宽调制)信号产生器312。所述比较器311的反相输入端S1与所述反馈端P1连接，正相输入端S2与所述参考电压端P2连接。所述比较器311的输出端O1与所述PWM信号产生器312的负极输入端F1连接，所述PWM信号产生器312的正极输入端F2连接一正电压V+。所述正电压V+也为电子装置100上电后固定提供的电压，例如为3伏等。
如图2所示，所述电源调节单元32包括一第二开关管Q2。所述第二开关管Q2的栅极与所述PWM信号产生器312的输出端O2连接，源极接地，漏极与所述电源电路10的输出端OUT1及所述LED模组20的正极端P+耦接。所述PWM信号产生器312的输出端O2即作为所述驱动芯片31的输出端P3。所述PWM信号产生器312用于通过输出端O2输出PWM信号控制所述第二开关管Q2周期性地导通截止，而对所述电源电路10输出的电压进行调节。
当所述第一开关管Q1接收到所述2D/3D信号端40产生的二维信号而截止时，由于比较器311的虚短虚断性质，所述第一电阻R1中没有电流流过，此时反馈端P1的反馈端电压V1等于所述连接节点N1的检测电压Vf。
当所述第一开关管Q1接收到所述2D/3D信号端40产生的三维信号而导通时，所述第一电阻R1及第二电阻R2的支路导通，此时反馈端P1的反馈端电压V1＝Vf*R2/(R1+R2)。
在本实施例中，所述第二开关管Q2为高电平导通开关，例如为NMOS管。所述比较器311比较所述反馈端电压V1及所述参考电压Vref，在比较所述反馈 端电压V1小于所述参考电压时，所述比较器311输出低电平信号。所述PWM信号产生器312在负极输入端F1接收到低电平信号时，控制调低所输出的PWM信号的占空比，以使得所述第二开关管Q2在一个周期内的导通时间变短，从而增大了所述电源电路10输出至LED模组20的供电电压的占空比，增大了输出至LED模组20的供电电压。
所述比较器311在比较所述反馈端电压V1大于所述参考电压时，所述比较器311输出高电平信号。所述PWM信号产生器312的负极输入端F1接收到高电平信号时，控制调高所输出的PWM信号的占空比，以使得所述第二开关管Q2在一个周期内的导通时间变长，从而降低了所述电源电路10输出至LED模组20的供电电压的占空比，降低了输出至LED模组20的供电电压。
由于所述反馈端P1的反馈端电压V1在二维模式下等于所述检测电压Vf，在三维模式下等于Vf*R2/(R1+R2)，因此，所述反馈端电压V1与所述检测电压Vf一直呈正比例关系。当所述输出至LED模组20的供电电压增大时，所述检测电压Vf也增大，同样，所述反馈端电压V1也会增大。当所述输出至LED模组20的供电电压降低时，所述检测电压Vf也降低，同样，所述反馈端电压V1也会降低。从而，当所述比较器311在比较所述反馈端电压V1小于所述参考电压Vref时，所述反馈端电压V1将会被调节增大直到等于所述参考电压Vref。当所述比较器311在比较所述反馈端电压V1大于所述参考电压时，所述反馈端电压V1将会被调节减少直到等于所述参考电压Vref。
由于参考电压Vref是一个固定值，当电子装置100在二维模式下稳定工作时，所述检测电压Vf等于反馈端电压V1等于所述参考电压Vref，此时，流过LED模组20中的LED灯L1的电流IL＝Vref/Rf。当电子装置100在三维模式下稳定工作时，反馈端电压V1等于所述参考电压Vref，且反馈端电压V1＝Vref＝Vf*R2/(R1+R2)。此时，检测电阻Rf的检测电压(R1+R2)*Vref/R2，流过LED模组20中的LED灯L1的电流IL＝Vf/Rf＝(R1+R2)*Vref/(R2*Rf)，大于二维模式下LED灯L1所流过的电流。
如图2所示，所述整流滤波电路50包括二极管D1及第一电容C1，所述二 极管D1的正极与所述第二开关管Q2的漏极连接，负极与所述第一电容C1的一端以及所述LED的正极端P+连接，所述第一电容C1的另一端接地。
如图2所示，所述电源电路10与所述电源调节单元32之间还包括有第二电容C2及电感G1，所述第二电容C2及电感G1用于对电源电路10输出的电压进行滤波及稳压等调节。
其中，所述电源电路10可包括电压转换电路等，用于接入市电电源或电池的电压并将接入的电压转换为适合电子装置100的电源电压。所述电子装置100可为液晶显示器、具有液晶显示屏的液晶电视、电脑、手机等电子装置。
其中，本发明的第一开关管Q1、第二开关管Q2也可为NPN三极管代替。显然，在其他实施方式中，该第一开关管Q1、第二开关管Q2也可为PMOS管或PNP三极管。
以上所揭露的仅为本发明一种较佳实施方式而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施方式的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。

Claims (20)

  1. 一种背光控制电路，用于对一电子装置的LED模组的电流进行调节，所述LED模组包括正极端、接地端、以及串联于正极端、接地端之间的至少一个LED灯及检测电阻，其特征在于，所述背光控制电路包括：
    驱动芯片，包括反馈端、参考电压端和输出端，所述参考电压端连接一参考电压；
    反馈电压调节单元，连接于所述驱动芯片的反馈端及所述检测电阻的远地端之间，用于调节所述检测电阻的远地端的检测电压传递至所述反馈端的反馈端电压；以及
    电源调节单元，耦接于电子装置的电源电路以及所述LED模组的正极端之间且与所述驱动芯片的输出端连接，用于响应驱动芯片的控制而调节电源电路输出至LED模组的供电电压；
    其中，所述反馈电压调节单元还与一2D/3D信号端连接，用于接收所述2D/3D信号端产生的二维信号或三维信号，其中，该2D/3D信号端在电子装置处于二维模式时产生二维信号，在电子装置处于三维模式时产生三维信号；所述反馈电压调节单元在接收到三维信号时，控制调低所述检测电压传递至所述反馈端的反馈端电压，使得所述反馈端电压小于所述参考电压，所述驱动芯片在所述反馈端电压小于所述参考电压时，控制电源调节单元调高对LED模组的供电电压，以增大流过LED模组的LED灯的电流。
  2. 如权利要求1所述的背光控制电路，其特征在于，所述反馈电压调节单元在接收到二维信号时，控制调高所述检测电阻的远地端的检测电压传递至所述反馈端的反馈端电压，使得所述反馈端电压大于所述参考电压，所述驱动芯片在所述反馈端电压大于所述参考电压时，控制电源调节单元调低对LED模组的供电电压，以降低流过LED模组的LED灯的电流。
  3. 如权利要求2所述的背光控制电路，其特征在于，所述反馈电压调节单元包括第一电阻、第二电阻及第一开关管，所述第一电阻、第二电阻及第一开关管依次串联于所述检测电阻的远地端及地之间，所述驱动芯片的反馈端与所述第一电阻、第二电阻的连接节点连接，所述第一开关管的栅极与所述 2D/3D信号端连接，源极接地，漏极与所述第二电阻连接。
  4. 如权利要求3所述的背光控制电路，其特征在于，当所述第一开关管接收到所述2D/3D信号端产生的二维信号时，所述第一开关管截止，所述第一电阻及第二电阻所在支路截止，所述反馈端电压等于所述检测电阻的检测电压，所述驱动芯片将所述反馈端电压与所述参考电压进行比较，并在所述反馈端电压与所述参考电压不相等时，控制所述电源调节单元调节输出至LED模组的供电电压，直到反馈端电压与所述参考电压相等时，控制所述电源调节单元维持当前输出至LED模组的供电电压，以使得流过LED模组的LED灯的电流维持在IL＝Vref/Rf，其中，Vref为参考电压，Rf为检测电阻的电阻值。
  5. 如权利要求4所述的背光控制电路，其特征在于，当所述第一开关管接收到所述2D/3D信号端产生的三维信号时，所述第一开关管导通，以使得所述第一电阻及第二电阻所在支路导通，此时反馈端电压V1＝Vf*R2/(R1+R2)，其中，V1为反馈端电压，Vf为检测电阻的远地端的检测电压，R1为第一电阻的电阻值，R2为第二电阻的电阻值，所述驱动芯片在所述反馈端电压与所述参考电压不相等时，控制所述电源调节单元调节输出至LED模组的供电电压，直到反馈端电压与所述参考电压相等时，控制所述电源调节单元维持当前输出至LED模组的供电电压，以使得流过LED模组的的LED灯的电流维持在IL＝Vf/Rf＝(R1+R2)*Vref/(R2*Rf)，其中，Vref为参考电压，Rf为检测电阻的电阻值。
  6. 如权利要求5所述的背光控制电路，其特征在于，所述三维信号为高电平信号，二维信号为低电平信号，所述第一开关管为高电平导通开关，所述第一开关管在栅极接收到高电平的三维信号时导通，以及在栅极接收到低电平的二维信号时截止。
  7. 如权利要求5所述的背光控制电路，其特征在于，所述驱动芯片包括比较器及PWM信号产生器，所述比较器的正相输入端与所述参考电压端连接，反相输入端与所述反馈端连接，所述比较器的输出端与所述PWM信号产生器的负极输入端连接，所述PWM信号产生器的正极输入端连接一正电压，所述PWM信号发生器的输出端作为驱动芯片的输出端。
  8. 如权利要求7所述的背光控制电路，其特征在于，所述电源调节单元 包括一第二开关管，所述第二开关管的栅极与所述PWM信号产生器的输出端连接，源极接地，漏极与所述电源电路的输出端及所述LED模组的正极端耦接，所述PWM信号产生器用于输出PWM信号控制所述第二开关管周期性的导通截止，而对所述电源电路输出的电压进行调节。
  9. 如权利要求8所述的背光控制电路，其特征在于，所述第二开关管为高电平导通开关；在所述反馈端电压小于所述参考电压时，所述比较器输出低电平信号，所述PWM信号产生器在负极输入端接收到低电平信号时，控制调低所输出的PWM信号的占空比，以使得所述第二开关管在一个周期内的导通时间变短，从而增大了所述电源电路输出至LED模组的供电电压的占空比，增大了输出至LED模组的供电电压；在所述反馈端电压大于所述参考电压时，所述比较器输出高电平信号，所述PWM信号产生器在负极输入端接收到高电平信号时，控制调高所输出的PWM信号的占空比，以使得所述开关管在一个周期内的导通时间变长，从而降低了所述电源电路输出至LED模组的供电电压的占空比，降低了输出至LED模组的供电电压。
  10. 如权利要求8所述的背光控制电路，其特征在于，所述第一开关管及第二开关管为NMOS管或NPN三极管。
  11. 一种电子装置，包括电源电路、LED模组，所述电源电路用于输出电源电压，所述LED模组包括正极端、接地端、以及串联于正极端、接地端之间的至少一个LED灯及检测电阻，其特征在于，所述电子装置还包括背光控制电路，所述背光控制电路包括：
    驱动芯片，包括反馈端、参考电压端和输出端，所述参考电压端连接一参考电压；
    反馈电压调节单元，连接于所述驱动芯片的反馈端及所述检测电阻的远地端之间，用于调节所述检测电阻的远地端的检测电压传递至所述反馈端的反馈端电压；以及
    电源调节单元，耦接于电子装置的电源电路以及所述LED模组的正极端之间且与所述驱动芯片的输出端连接，用于响应驱动芯片的控制而调节电源电路输出至LED模组的供电电压；
    其中，所述反馈电压调节单元还与一2D/3D信号端连接，用于接收所述 2D/3D信号端产生的二维信号或三维信号，其中，该2D/3D信号端在电子装置处于二维模式时产生二维信号，在电子装置处于三维模式时产生三维信号；所述反馈电压调节单元在接收到三维信号时，控制调低所述检测电压传递至所述反馈端的反馈端电压，使得所述反馈端电压小于所述参考电压，所述驱动芯片在所述反馈端电压小于所述参考电压时，控制电源调节单元调高对LED模组的供电电压，以增大流过LED模组的LED灯的电流。
  12. 如权利要求11所述的电子装置，其特征在于，所述反馈电压调节单元在接收到二维信号时，控制调高所述检测电阻的远地端的检测电压传递至所述反馈端的反馈端电压，使得所述反馈端电压大于所述参考电压，所述驱动芯片在所述反馈端电压大于所述参考电压时，控制电源调节单元调低对LED模组的供电电压，以降低流过LED模组的LED灯的电流。
  13. 如权利要求12所述的电子装置，其特征在于，所述反馈电压调节单元包括第一电阻、第二电阻及第一开关管，所述第一电阻、第二电阻及第一开关管依次串联于所述检测电阻的远地端及地之间，所述驱动芯片的反馈端与所述第一电阻、第二电阻的连接节点连接，所述第一开关管的栅极与所述2D/3D信号端连接，源极接地，漏极与所述第二电阻连接。
  14. 如权利要求13所述的电子装置，其特征在于，当所述第一开关管接收到所述2D/3D信号端产生的二维信号时，所述第一开关管截止，所述第一电阻及第二电阻所在支路截止，所述反馈端电压等于所述检测电阻的检测电压，所述驱动芯片将所述反馈端电压与所述参考电压进行比较，并在所述反馈端电压与所述参考电压不相等时，控制所述电源调节单元调节输出至LED模组的供电电压，直到反馈端电压与所述参考电压相等时，控制所述电源调节单元维持当前输出至LED模组的供电电压，以使得流过LED模组的LED灯的电流维持在IL＝Vref/Rf，其中，Vref为参考电压，Rf为检测电阻的电阻值。
  15. 如权利要求14所述的电子装置，其特征在于，当所述第一开关管接收到所述2D/3D信号端产生的三维信号时，所述第一开关管导通，以使得所述第一电阻及第二电阻所在支路导通，此时反馈端电压V1＝Vf*R2/(R1+R2)，其中，V1为反馈端电压，Vf为检测电阻的远地端的检测电压，R1为第一电阻的电阻值，R2为第二电阻的电阻值，所述驱动芯片在所述反馈端电压与所 述参考电压不相等时，控制所述电源调节单元调节输出至LED模组的供电电压，直到反馈端电压与所述参考电压相等时，控制所述电源调节单元维持当前输出至LED模组的供电电压，以使得流过LED模组的的LED灯的电流维持在IL＝Vf/Rf＝(R1+R2)*Vref/(R2*Rf)，其中，Vref为参考电压，Rf为检测电阻的电阻值。
  16. 如权利要求15所述的电子装置，其特征在于，所述三维信号为高电平信号，二维信号为低电平信号，所述第一开关管为高电平导通开关，所述第一开关管在栅极接收到高电平的三维信号时导通，以及在栅极接收到低电平的二维信号时截止。
  17. 如权利要求15所述的电子装置，其特征在于，所述驱动芯片包括比较器及PWM信号产生器，所述比较器的正相输入端与所述参考电压端连接，反相输入端与所述反馈端连接，所述比较器的输出端与所述PWM信号产生器的负极输入端连接，所述PWM信号产生器的正极输入端连接一正电压，所述PWM信号发生器的输出端作为驱动芯片的输出端。
  18. 如权利要求17所述的电子装置，其特征在于，所述电源调节单元包括一第二开关管，所述第二开关管的栅极与所述PWM信号产生器的输出端连接，源极接地，漏极与所述电源电路的输出端及所述LED模组的正极端耦接，所述PWM信号产生器用于输出PWM信号控制所述第二开关管周期性的导通截止，而对所述电源电路输出的电压进行调节。
  19. 如权利要求18所述的电子装置，其特征在于，所述第二开关管为高电平导通开关；在所述反馈端电压小于所述参考电压时，所述比较器输出低电平信号，所述PWM信号产生器在负极输入端接收到低电平信号时，控制调低所输出的PWM信号的占空比，以使得所述第二开关管在一个周期内的导通时间变短，从而增大了所述电源电路输出至LED模组的供电电压的占空比，增大了输出至LED模组的供电电压；在所述反馈端电压大于所述参考电压时，所述比较器输出高电平信号，所述PWM信号产生器在负极输入端接收到高电平信号时，控制调高所输出的PWM信号的占空比，以使得所述开关管在一个周期内的导通时间变长，从而降低了所述电源电路输出至LED模组的供电电压的占空比，降低了输出至LED模组的供电电压。
  20. 如权利要求18所述的电子装置，其特征在于，所述第一开关管及第二开关管为NMOS管或NPN三极管。
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