WO2015081626A1 - Led 升压转换器及应用其的背光源led驱动装置 - Google Patents

Led 升压转换器及应用其的背光源led驱动装置 Download PDF

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Publication number
WO2015081626A1
WO2015081626A1 PCT/CN2014/070833 CN2014070833W WO2015081626A1 WO 2015081626 A1 WO2015081626 A1 WO 2015081626A1 CN 2014070833 W CN2014070833 W CN 2014070833W WO 2015081626 A1 WO2015081626 A1 WO 2015081626A1
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Prior art keywords
display mode
resistor
dimensional
detection
switching transistor
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PCT/CN2014/070833
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English (en)
French (fr)
Inventor
王照
曹丹
Original Assignee
深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to KR1020167017284A priority Critical patent/KR101847320B1/ko
Priority to RU2016121673A priority patent/RU2633146C1/ru
Priority to GB1609271.0A priority patent/GB2535100B/en
Priority to JP2016536611A priority patent/JP6280988B2/ja
Priority to US14/240,373 priority patent/US9489898B2/en
Publication of WO2015081626A1 publication Critical patent/WO2015081626A1/zh

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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
    • G09G3/22—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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/06—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources
    • G09G3/10—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions using controlled light sources using gas tubes
    • 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
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • 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
    • G09G2330/025—Reduction of instantaneous peaks of current
    • 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
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • 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 liquid crystal display technology, and more particularly to an LED boost converter and a backlight thereof: LED driving device.
  • LCDs liquid crystal displays
  • the LEC panel Since the liquid crystal itself does not emit light, the LEC panel itself does not have the characteristics of light emission, and requires an illumination source, which is a backlight type display device.
  • the imaging principle of the liquid crystal display is that after the electrodes in the panel are energized, the liquid crystal molecules are twisted after the electrodes are powered, so that the light of the backlight module can pass and realize the light.
  • Backlight is an optical component that provides a back light source in LCD display products. Therefore, the quality of the backlight determines the brightness of the LCD display screen, the uniformity of the emitted light, the color gradation and other important parameters, which largely determines the illuminating effect of the LCD display.
  • LED Light-Emitting Diode
  • CCFLs Cold Cathode Fluorescent Lamps
  • the same ISEN voltage detection is used in two different working modes of two-dimensional (2D) and three-dimensional (3D). Point-to-circuit protection for overcurrent.
  • 2D and 3D display modes the peak value (Peak value) of the inductor current in the boost circuit is not the same.
  • the currents of I ⁇ 2D and I ⁇ JD are not the same.
  • the inductive current of the inductor in 2D display mode is designed to detect After measuring the resistance (after entering the 3D display mode as shown in the figure, the overcurrent protection function by the SEN pin detection of the controller (chip CEC83)) due to the change of the peak current cannot be performed with the 2D display.
  • the same protection function in the mode depending on the design of each model, component damage or abnormal protection may occur. Therefore, how to solve the above problems, in the different display modes, the same overcurrent protection of the circuit, to avoid the phenomenon of component damage and abnormal protection, is one of the topics of the industry.
  • One of the technical problems to be solved by the present invention is to provide an LED boost converter.
  • the pressure converter can perform the same overcurrent protection on the circuit in different display modes to avoid component damage and abnormal protection.
  • a backlight LED driving device using the LED boost converter is also provided.
  • the present invention provides an LED boost converter, including: an inductive voltage circuit for boosting an input voltage to a LED operation in a current display mode in different display modes The required operating voltage; a detection circuit that uses different display modes to select the detector resistors for different display modes to provide detection of the inductive type?
  • the detection circuit is connected to the inductive booster circuit; a controller for providing a pulse width modulation signal to drive the inductive booster circuit for fraud, and detecting
  • the controller includes a GATE terminal connected to the inductive booster circuit and a current detecting input terminal connected to the detecting circuit, wherein the detecting voltage corresponding to the detecting current exceeds a reference voltage, where
  • the display mode includes a two-dimensional display mode and a three-dimensional display mode. In one embodiment, the two-dimensional display mode inductance? Inductor current I peak inductor type booster circuit 1.
  • the boost circuit inductor peak current small dried dimensional display mode I ⁇ JD ⁇ JD, said detection
  • the circuit further includes: a first resistor having one end connected to a ground reference, the other end connected to the - source of the switching transistor of the inductive boost circuit; and a second resistor having one end opposite the first resistor Connected to a source of the switching transistor; a first switching transistor having a gate connected to the 2D/3D switching signal input terminal and a drain connected to the other end of the second resistor, The source is connected to a ground reference.
  • the inductor peak current I ⁇ JD inductive voltage divider circuit two-dimensional display mode is greater than ⁇ : when the peak inductor current I boost circuit inductor type dimensional display mode ⁇ JD, said detection circuit further The method includes: a first resistor, one end of which is connected to a ground reference, the other end is connected to a - source of the switching transistor of the inductive booster circuit; and a second resistor having one end together with the first resistor Connected to a source of the bypass transistor; a switching transistor having a drain connected to the other end of the second resistor, a source connected to a ground reference; a third: three resistor; a second switching transistor having a cabinet connected to the two-dimensional/ ⁇ a dimension switching signal input terminal, a drain is connected to a voltage supply terminal through the third: third resistor, and the drain is further connected to a cabinet of the first switching transistor, and a source is connected to a ground reference .
  • the first switching transistor when the two-dimensional state signal is outputted by the two-dimensional ⁇ three-dimensional switching signal input end, the first switching transistor is turned off, and the detecting resistance value in the two-dimensional display mode is equal to the resistance of the first resistor. a value; when the two-dimensional/dimensional switching signal input terminal outputs: a three-dimensional state signal, the first switching transistor is turned on, and the detecting resistance value in the dimensional display mode is equal to the first resistance and the first The resistance value after the two resistors are connected in parallel.
  • the second switching transistor when the two-dimensional/three-dimensional switching signal input terminal outputs a two-dimensional state signal, the second switching transistor is turned off and the first switching transistor is turned on, and the detecting is performed in the two-dimensional display mode.
  • the resistance value is equal to the resistance value after the first resistance and the second resistance are connected in parallel; when the two-dimensional/ ⁇ : dimensional switching signal input terminal outputs the ⁇ : dimensional state signal, the first switching transistor is turned off and The second switching transistor is turned on, and the value of the traceback resistance in the dimension display mode is equal to the resistance value of the first resistor.
  • the magnitudes of the values of the first resistor and the second resistor are respectively calculated by the following expressions;
  • / ⁇ and ) are the detection resistors in the two-dimensional display mode and the three-dimensional display mode, respectively, as shown in the following expressions:
  • Pk_3D where is the reference voltage of the controller, 4 ⁇ and the inductive boosting display in the two-dimensional display mode and the ⁇ : dimensional display mode;
  • 2D is the current and voltage required for LED operation in 2D display mode
  • I OJD and V OJD are the current and voltage required for LED operation in 3D display mode, respectively
  • input voltage L is the inductive type
  • the magnitude of the inductance of the voltage circuit, / is the switching frequency of the switching transistor of the inductive booster circuit
  • a backlight LED driving apparatus comprising: an inductive boosting circuit for boosting an input voltage to the LED in a current display mode in different display modes Working voltage required for operation: a detecting circuit for selecting different detecting modes of the detecting resistors in different display modes to provide different detecting currents for detecting the inductive boosting circuit
  • the detection circuit is connected to the inductive booster circuit; a controller for providing a pulse width modulation signal to drive the inductive booster circuit to operate, and detecting a detection voltage corresponding to the detected current Whether the controller exceeds a reference voltage, the controller includes a GATE terminal connected to the inductive booster circuit and a current trace input terminal connected to the detecting circuit, wherein the display mode includes a two-dimensional display mode and a dimensional display mode .
  • the detecting circuit when the inductor peak current I ⁇ JD of the inductive booster circuit of the two-dimensional display mode is smaller than the inductor peak current pfe ⁇ of the inductive booster circuit of the three-dimensional display mode, the detecting circuit further includes: a first resistor, one end of which is connected to a ground reference, and the other end of which is connected to a source of the switching transistor of the inductive booster circuit: a second resistor, one end of which is connected to the first resistor a source of the switching transistor: a first switching transistor having a gate connected to the two-dimensional ⁇ : dimension switching signal input terminal, a drain connected to the other end of the second resistor, and a source connected to the Grounding Reference
  • the detecting circuit when the inductor peak current I ⁇ JD of the inductive booster circuit in the two-dimensional display mode is greater than the inductor peak current pfe ⁇ of the inductive booster circuit of the three-dimensional display mode, the detecting circuit The method further includes: a first resistor,
  • the invention provides a detection circuit in the LED boost converter, so that the 2D display mode and the 3D display mode respectively have their working currents corresponding to: the SEN detection resistance, which may prevent the 3D display mode from appearing.
  • FIG. 2 is a schematic structural diagram of an LED boost converter according to an embodiment of the invention.
  • FIG. 3 is a diagram showing an example of a first circuit of an LED boost converter according to the present invention.
  • FIG. 4 is a diagram showing an example of a second circuit of an LED boost converter in accordance with the present invention.
  • BEST MODE FOR CARRYING OUT THE INVENTION In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the drawings.
  • FIG. 2 shows an LED boost converter according to an embodiment of the present invention.
  • the LED boost converter can be used to select different detections in the 2D / 3D mode T through its internally set detection circuit.
  • the resistors provide different ISEN current detection points for the ISEN current sense input of the control IC to avoid component damage or abnormal protection in the 3D display mode.
  • the connection manner of the LEDs in the actual circuit is series-parallel mixing and mixing, and only one series-connected LED in the hybrid circuit is used in the embodiment of the present invention. The string is reversed for explanation.
  • the LED boost converter includes an inductive boost circuit 100 for boosting an input voltage to an operating voltage required for operation of the LED in a current display mode in different display modes, the inductive boost circuit 100 including An inductor, a switching transistor, a diode, and a capacitor.
  • an inductor is an energy conversion device that converts electrical energy and magnetic field energy into each other. After the switching transistor is closed, the inductor converts the electrical energy into magnetic field storage for storage. When the switching transistor is turned off, the inductor converts the stored magnetic field energy into electric field energy, and this energy and the input voltage are superimposed and filtered by the diode and the capacitor to obtain a smooth DC voltage to be supplied to the load. Since this voltage is formed by the superposition of the input field voltage and the magnetic field energy of the inductor into electrical energy, the output voltage is higher than the input voltage.
  • the LED boost converter further includes a detection circuit 200 for selecting detection resistors for different display modes in different display modes to provide different detection currents for detecting the inductive booster circuit 100.
  • the measuring circuit 200 is connected to the source of the switching transistor of the inductive booster circuit 100.
  • a controller 300 for providing a pulse width modulation signal to drive the inductive booster circuit 100 to operate, and detecting whether the detected voltage corresponding to the traceback current exceeds a reference voltage
  • the controller 300 includes a GATE terminal connected to the gate of the inductive booster circuit 00 switching transistor and a current traceback input terminal (referred to as the ISEN terminal) connected to the traceback circuit 200.
  • the display modes covered in this article include two-dimensional (2D) display mode and three-dimensional (3D) display mode.
  • 3 is a first circuit diagram of an LED boost converter according to the present invention, which is an inductive booster circuit in which an inductor peak current of an inductive booster circuit 100 applied in a two-dimensional display mode is smaller than a three-dimensional display mode.
  • the detecting circuit 200 includes: a first resistor connected to a ground reference at one end and to the source of the switching transistor of the inductive boost circuit 100 at the other end.
  • a second resistor R 2 one end of which is connected to the first resistor Rr — is connected to the source of the switching transistor of the inductive booster circuit 100 .
  • a first switching transistor Q3 having a gate connected to the two-dimensional/ ⁇ : dimensional switching signal input terminal, a drain passing through the other end of the second resistor, and a source connected to a ground reference.
  • the detection circuit 200 is overcurrent protected.
  • the two-dimensional state signal (referred to as a 2D signal, which is a low-level signal) is outputted at the input end of the two-dimensional/three-dimensional switching signal, the first switching transistor Q3 is turned off, that is, the first switching transistor Q3 is turned off, and the two-dimensional display is displayed at this time.
  • the resistance value of the resistance equal to the first mode: the value R_ 3.
  • the first switching transistor Q3 When the three-dimensional state signal (referred to as a 3D signal, which is a high level signal) is outputted at the input end of the two-dimensional/three-dimensional switching signal, the first switching transistor Q3 is turned on, and the detecting resistance value in the dimensional display mode is equal to the first The resistance value after the resistor and the second resistor are connected in parallel.
  • a 3D signal which is a high level signal
  • the ISEN end of the controller 300 obtains the detection current of the inductor in the current inductive booster circuit 100 according to the current detected resistance value (the resistance value or the parallel resistance value), and then judges according to the detected current. Whether the detected voltage corresponding to the detected current exceeds its internal reference voltage. Specifically, in actual work, if it exceeds The internal preset protection current, the circuit driver IC 300 automatically stops working, and the LED operating voltage and current are stopped.
  • 4 is a diagram showing an example of a second circuit of an LED boost converter in accordance with the present invention.
  • This circuit is applied in the case where the inductor peak current of the inductive booster circuit 100 applied in the two-dimensional display mode is larger than the inductor peak current of the inductive booster circuit of the three-dimensional display mode by 1 ⁇ 4 ⁇ .
  • the tracing circuit 200 further investigation comprising: a first resistor: R_ 3, having one end connected to a ground reference, a source connected to the other end 100 of the inductor type booster circuit switching transistor.
  • a second resistor, one end of which is coupled to the first resistor Rr, is coupled to the source of the switching transistor in the inductive booster circuit 100.
  • a first switching transistor Q3 has a drain connected to the other end of the second resistor and a source connected to a ground reference.
  • a second switching transistor Q2 having a pole connected to the two-dimensional/dimensional switching signal input terminal, a drain connected to a voltage supply terminal through the third resistor (as shown in FIG. 5V), and the drain further It is connected to the gate of the switching transistor Q3, and a source is connected to the ground reference.
  • the third: three resistors are mainly used to limit the current when the transistor Q2 is turned on. The following describes in detail how to use the detection circuit 200 for overcurrent protection.
  • the second switching transistor is turned off, and the first switching transistor Q3 is turned on, and the detecting resistance value in the two-dimensional display mode is equal to the parallel connection of the first resistor and the second resistor value.
  • the three-dimensional state signal is outputted at the input end of the two-dimensional/three-dimensional switching signal, the first switching transistor Q2 is turned on and the second switching transistor Q3 is turned off, and the detecting resistance value of the three-dimensional display mode T is equal to the resistance value of the first resistor.
  • the 3D signal when the 3D signal is input, since the Gate voltage of the transistor Q2 is high, Q2 is turned on, and the Gate signal of Q3 is pulled low, so that Q3 is turned off, and the resistor R2 is not connected to the circuit, and the 3D mode is at this time.
  • the lower detection resistance is the R resistance.
  • the ISEN end of the controller 100 obtains the detection current of the inductor in the current inductive booster circuit 100 according to the current detected resistance value (the resistance value or the parallel resistance value of R 2 ), and further determines according to the detected current. Whether the detected voltage corresponding to the detected current exceeds its internal reference voltage, and when it is exceeded, the drive will stop working. In this way, since the detection resistor corresponding to the operating current is respectively provided in the 2D display mode and the 3D display mode, it is possible to prevent component damage or abnormal protection which may occur in the 3D display mode.
  • the magnitudes of the values of the first resistance and the second resistance are respectively calculated by the following expressions;
  • the inductor peak currents of the inductive boost circuit are shown in the following expressions; ⁇ p. k_2D
  • IN LfV O 3D where – 2 2D is the current and voltage required for LED operation in 2D display mode, respectively.
  • I oJD and VojD are the current and voltage required for LED operation in 3D display mode, and are input voltage.
  • L is the magnitude of the inductance of the inductive booster circuit, and / is the switching frequency of the bypass transistor of the inductive booster circuit.
  • a backlight LED driving device which includes the above-described LED boost converter.
  • the present invention provides a detection circuit in the LED boost converter, so that the ISEN detection resistor corresponding to its operating current is respectively in the 2D display mode and the 3D display mode, thereby preventing the possibility of being in the 3D display mode.

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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Dc-Dc Converters (AREA)
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Abstract

一种LED升压转换器及应用其的背光源LED驱动装置，该LED升压转换器包括：一电感型升压电路（100），其用于在不同显示模式下，将输入电压升压至当前显示模式下LED工作所需的工作电压；一侦测电路（200），其用于在不同的显示模式下，选择针对不同显示模式的侦测电阻以提供侦测电感型升压电路（100）的不同的侦测电流；一控制器（300），其用于提供脉冲宽度调制信号以驱动电感型升压电路（100）工作，以及检测与侦测电流对应的侦测电压是否超过基准电压。通过在LED升压转换器中设置了侦测电路，使得在2D显示模式与3D显示模式下分别有与其工作电流相对应的侦测电阻，防止在3D显示模式下可能会出现的元件损坏或异常保护的现象。

Description

LED升压转换器及应用其的背光源 LED驱动装置
技术领域
本发明涉及液晶显示技术， 尤其涉及一种 LED升压转换器及应 ]¾其的背光源: LED驱 动装置。
背景技术
近年来， 随着薄型化的显示趋势， 液晶显示器 （Liquid Crystal Display, 简称 LCD) 已广泛使用在各种电子产品的应用中， 例如手机、 笔记本计算机以及彩色电视机等。
由于液晶自身不会发光， LEC 面板本身也不具备发光的特性， 需要照明光源， 它属 于背光型显示器件。 液晶显示的成像原理是靠面板中的电极通电后， 液晶分子在电极通 电之后会发生扭转， 从而让背光模组的光线能够通过并实现发光。 背光源（Backlight)即 是提供 LCD显示器产品中一个背面光源的光学组件。 因而， 背光源的质量决定了 LCD显 示器屏幕的亮度、 出射光均匀度、 色阶等重要参数， 很大程度上决定了 LCD显示器的发 光效果。
作为 LCD显示器的背光源， 发光二极管 （Light-Emitting Diode, LED) 现在已显露 出取代冷阴极荧光灯管（Cold Cathode Fluorescent Lamp, CCFL)的趋势。 其具有色域宽、 色彩还原性好、 可控性强、 寿命长、 不含汞蒸气和其他有害气体等优点。 由于 LED是一 个低压非线性半导体器件， LED 的正向电压会随着电流和温度的变化而变化， 需要有驱 动电路才能保证其稳定可靠地工作。 因此， 研究背光源用 LED驱动电路是本领域技术人 员所致力的主要课题。
目前背光源 LED驱动电路中， 尤其是其中的 LED升压转换器 ( Coiwerter)的设计中， 在二维 （简称 2D)和三维 （简称 3D)两种不同的工作模式下使用相同 ISEN电压侦测点 对电路进行过电流保护。 在 2D和 3D显示模式下， 升压电路中电感电流的峰值（Peak值） 并不相同。 而根据各机种设†及 LED工作状态不同， 因此 I≠ 2D与 I≠JD电流大小也不尽 相同。
然而， 在常规设计中， 如图 1所示， 会按照 2D显示模式下电感的耐受电流去设计侦 测用电阻（图中所示 而进入 3D 显示模式后， 因峰值电流的改变， 通过控制器（芯 片 CEC83 ))的】SEN管脚侦测进行的过流保护功能便无法起到与在 2D显示模式下相同 的保护功能， 根据各机种设计的不同， 可能会出现元件损坏或者异常保护。 因此， 如何解决上述问题， 以在不同显示模式下， 对电路进行相同的过流保护， 避 免出现元件损坏及异常保护的现象， 乃业界所致力的课题之一。
发明内容 本发明所要解决的技术问题之一是需要提供一种 LED升压转换器， 该？}·压转化器能 够在不同显示模式下， 对电路进行相同的过流保护， 避免出现元件损坏及异常保护的现 象。 另外， 还提供了一种应用该 LED升压转换器的背光源 LED驱动装置。 为了解决上述技术问题， 本发明提供了一种 LED升压转换器， 包括； 一电感型 压 电路， 其用于在不同显示模式下， 将输入电压升压至当前显示模式下所述 LED工作所需 的工作电压； 一侦测电路， 其用干在不同的显示模式下， 选择针对不同显示模式的侦劉 电阻以提供侦测所述电感型？1·压电路的不同的侦测电流， 所述侦测电路连接所述电感型 升压电路； 一控制器， 其 于提供脉冲宽度调制信号以驱动所述电感型升压电路工诈， 以及检测与所述侦测电流对应的侦测电压是否超过基准电压， 所述控制器包括连接所述 电感型升压电路的 GATE端和连接所述侦测电路的电流侦测输入端， 其中， 所述显示模 式包括二维显示模式和三维显示模式。 在一个实施例中， 在二维显示模式的电感型 ?1·压电路的电感峰值电流 I≠JD小干 维 显示模式的电感型升压电路的电感峰值电流 I≠JD时， 所述侦测电路进一步包括： 一第一 电阻， 其一端连接至一接地参考， 另一端连接至所述电感型升压电路的开关晶体管的 - - 源极； 一第二电阻， 其一端同所述第一电阻一并连接至所述幵关晶体管的一源极； 一第 一开关晶体管， 其一栅极连接至二维 /三维切换信号输入端， 一漏极连接至所述第二电阻 的另一端， 一源极连接至一接地参考。 在一个实施例中， 在二维显示模式的电感型 压电路的电感峰值电流 I≠JD大于 Ξ:维 显示模式的电感型升压电路的电感峰值电流 I≠JD时， 所述侦测电路进一步包括： 一第一 电阻， 其一端连接至一接地参考， 另一端连接至所述电感型升压电路的开关晶体管的 - - 源极； 一第二电阻， 其一端同所述第一电阻一并连接至所述幵关晶体管的一源极； 一第 一开关晶体管， 其一漏极连接至所述第二电阻的另一端， 一源极连接至一接地参考； 一 第:三电阻； 一第二开关晶体管， 其一櫥极连接至二维 /Ξ:维切换信号输入端， 一漏极通过 所述第：三电阻连接至一电压供应端并旦该漏极还连接至所述第一开关晶体管的一櫥极， 一源极连接至一接地参考。
在一个实施倒中， 在所述二维 Λ三维切换信号输入端输出二维状态信号时， 所述第一 开关晶体管截止， 二维显示模式下的侦测电阻值等于所述第一电阻的电阻值； 在所述二 维 / 维切换信号输入端输出:三维状态信号时， 所述第一开关晶体管导通， Ξ;维显示模式 下的侦测电阻值等于所述第一电阻和所述第二电阻并联后的电阻值。
在一个实施倒中， 在所述二维 /三维切换信号输入端输出二维状态信号时， 所述第二 开关晶体管截止和所述第一幵关晶体管导通， 二维显示模式下的侦測电阻值等于所述第 一电阻和所述第二电阻并联后的电阻值； 在所述二维 /Ξ:维切换信号输入端输出 Ξ:维状态 信号时， 所述第一开关晶体管截止和所述第二开关晶体管导通， Ξ:维显示模式下的侦溯 电阻值等于所述第一电阻的电阻值。 在一个实施 ^中， 所述第一电阻和第二电阻的值的大小分别通过以下表达式来†算 得到；
Figure imgf000005_0001
其中， /^和 )分别是二维显示模式和三维显示模式下的侦测电阻， 各自分别如下 表达式所示：
！. p, k_2D
二
pk_3D 其中， 是所述控制器的基准电压， 4^^和 分别是二维显示模式和 Ξ:维显示 模式下的电感型升压电 示；
Figure imgf000005_0002
Figure imgf000006_0001
其中， 2D分别是二维显示模式下 LED工作所需的电流和电压， IOJD、 VOJD 分别是三维显示模式下 LED工作所需的电流和电压， 是输入电压， L是所述电感型升 压电路的电感的大小， /是所述电感型升压电路的开关晶体管的开关频率》
根据本发明的另一方面， 还提供了一种背光源 LED驱动装置， 包括： 一电感型升压 电路， 其用于在不同显示模式下， 将输入电压升压至当前显示模式下所述 LED工作所需 的工作电压： 一侦测电路， 其用于在不同的显示模式下， 选择针对不同显示模式的侦测 电阻以提供侦测所述电感型升压电路的不同的侦测电流， 所述侦测电路连接所述电感型 升压电路； 一控制器， 其用于提供脉 宽度调制信号以驱动所述电感型升压电路工作， 以及检测与所述侦测电流对应的侦测电压是否超过基准电压， 所述控制器包括连接所述 电感型升压电路的 GATE端和连接所述侦测电路的电流侦溯输入端， 其中， 所述显示模 式包括二维显示模式和 维显示模式。 在一个实施例中， 在二维显示模式的电感型升压电路的电感峰值电流 I≠JD小于三维 显示模式的电感型升压电路的电感峰值电流 pfe ^时， 所述侦测电路进一步包括： 一第一 电阻， 其一端连接至一接地参考， 另一端连接至所述电感型升压电路的开关晶体管的一 源极： 一第二电阻， 其一端同所述第一电阻一并连接至所述开关晶体管的一源极： 一第 一开关晶体管， 其一栅极连接至二维 ΛΞ:维切换信号输入端， 一漏极连接至所述第二电阻 的另一端， 一源极连接至一接地参考》 在一个实施例中， 在二维显示模式的电感型升压电路的电感峰值电流 I≠JD大于三维 显示模式的电感型升压电路的电感峰值电流 pfe ^时， 所述侦测电路进一步包括： 一第一 电阻， 其一端连接至一接地参考， 另一端连接至所述电感型升压电路的开关晶体管的一 源极； 一第二电阻， 其一端同所述第一电阻一并连接至所述幵关晶体管的一源极： 一第 一开关晶体管， 其一漏极连接至所述第二电阻的另一端， 一源极连接至一接地参考； 一 第:三电阻； 一第二开关晶体管， 其一櫥极连接至二维 /Ξ:维切换信号输入端， 一漏极通过 所述第：三电阻连接至一电压供应端并旦该漏极还连接至所述第一开关晶体管的一櫥极， •源极连接至一接地参考。 与现有技术相比， 本发明的一个或多个实施 ^可以具有如下优点； 本发明通过在 LED升压转换器中设置了侦测电路， 使得在 2D显示模式与 3D显示模 式下分别有与其工作电流相对应的: SEN侦测电阻， 防止在 3D 显示模式下可能会出现的 元件损坏或异常保护的现象》
虽然在下文中将结合一些示例性实施及使用方法来描述本发明， 但本领域技术人员 应当理解， 为并不旨在将本发明限制于这些实施^。 反之， 旨在覆盖包含在所跗的权利 要求书所定义的本发明的精神与范围内的所有替代品、 修正及等效物。
^图说明
^图用来提供对本发明的进一步理解， 并 ϋ构成说明 的一部分， 与本发明的实施 倒共同 ffi于解释本发明， 并不构成对本发明的限制。 在^图中- 图 1是现有技术中 LED升压转换器的示倒图；
图 2是根据本发明一实施例的 LED升压转换器的结构示意图；
图 3是根据本发明的 LED升压转换器的第一电路示例图；
图 4是根据本发明的 LED 升压转换器的第二电路示例图。 具体实施方式 为使本发明的目的、 技术方案和优点更加清楚， 以下结合 ^图对本发明作进一步地 详细说明。
请参考图 2， 图 2显示根据本发明一实施倒的 LED升压转换器， 该 LED升压转换器 通过其内部设置的侦测电路， 能够在用于在 2D /3D模式 T选择不同侦测电阻来为控制 IC 的 ISEN电流侦测输入端提供不同的 ISEN电流侦测点， 避免在 3D显示模式下出现的元 件损坏或异常保护的现象。 本发明中的 LED的连接方式可以是串联、 并联或串并混联， 在本发明实施例中， 实际电路中 LED的连接方式为串联并联混搭， 下面仅以混联电路中 的一串联的 LED串为倒进行说明。
该 LED升压转换器包括一电感型升压电路 100， 其用于在不同显示模式下， 将输入 电压升压至当前显示模式下 LED工作所需的工作电压， 该电感型升压电路 100包括一电 感、 一开关晶体管、 一二极管和一电容。
在该电感型升压电路 100 中， 电感是将电能和磁场能相互转化的能量转换器件， 当 开关晶体管闭合后， 电感将电能转换为磁场储能存储起来。 当开关晶体管断开后， 电感 将存储的磁场能转换成为电场能， 且这个能量和输入电压叠加后通过二极管和电容的滤 波得到平滑的直流电压提供给负载。 由干这个电压是输入电源电压和电感的磁场能转换 成为电能的叠加后形成的， 所以输出电压要高于输入电压。
该 LED升压转换器还包括侦测电路 200， 其用于在不同的显示模式下， 选择针对不 同显示模式的侦测电阻以提供侦测电感型升压电路 100的不同的侦测电流， 侦测电路 200 连接至电感型升压电路 100的开关晶体管的源极。
还包括了一个控制器（一般为电路驱动 IC) 300， 其用于提供脉冲宽度调制信号以驱 动电感型升压电路 100 工作， 以及检测与侦溯电流对应的侦测电压是否超过基准电压， 该控制器 300包括连接电感型升压电路 00开关晶体管栅极的 GATE端和连接侦溯电路 200的电流侦溯输入端 （简称 ISEN端） 。 本文中所涉及到的显示模式包括二维 （2D) 显 示模式和―三维 （3D) 显示模式。 图 3是根据本发明的 LED升压转换器的第一电路示^图， 该电路是应用在二维显示 模式的电感型升压电路 100的电感峰值电流 小于三维显示模式的电感型升压电路的 电感峰值电流 的情况 T。如图 3所示， 该侦測电路 200包括； 一第一电阻 , 其一 端连接至一接地参考， 另一端连接至电感型升压电路 100 的开关晶体管的源极。 一第二 电阻 R2, 其一端同第一电阻 Rr—并连接至电感型升压电路 100的开关晶体管的源极。 还 包括一第一开关晶体管 Q3 , 其一栅极连接至二维 /Ξ:维切换信号输入端， 一漏极通过第 二电阻 的另 ·端， 一源极连接至一接地参考。
下面详细说明如何利 该侦测电路 200迸行过电流保护的。 在二维 /三维切换信号输 入端输出二维状态信号 （简称 2D信号， 其为一低电平信号） 时， 第一开关晶体管 Q3截 止， 即第一开关晶体管 Q3断开， 此时二维显示模式下的侦测电阻值等于第一电阻: R_3的 值。
在二维 /三维切换信号输入端输出三维状态信号 （简称 3D信号， 其为一高电平信号） 时， 第一开关晶体管 Q3导通， Ξ:维显示模式下的侦测电阻值等于第一电阻 和第二电 阻 并联后的电阻值。
最后， 控制器 300的 ISEN端根据当前侦测电阻值（ 电阻值或 与 的并联电阻 值)得到当前电感型升压电路 100中的电感的侦测电流， 迸而根据该侦测电流进一歩判断 与该侦测电流对应的侦测电压是否超出其内部的基准电压。具体地， 实际工作中， 若超出 其内部预设的保护电流，則电路驱动 IC 300自动停止工作， LED工作电压电流进而停止。 图 4是根据本发明的 LED 升压转换器的第二电路示例图。 该电路应用在应用在二维 显示模式的电感型升压电路 100的电感峰值电流 大于三维显示模式的电感型升压电 路的电感峰值电流¼ ^的情况下。 如图 4所示， 该侦溯电路 200进一步包括： 一第一电 阻: R_3 , 其一端连接至一接地参考， 另一端连接至电感型升压电路 100中的开关晶体管的 源极。 一第二电阻 , 其一端同第一电阻 Rr—并连接至电感型升压电路 100中的开关晶 体管的源极。 一第一开关晶体管 Q3 , 其一漏极连接至第二电阻 的另一端， 一源极连 接至一接地参考。 一第二幵关晶体管 Q2, 其一極极连接至二维 /≡维切换信号输入端， 一漏极通过第≡电阻 连接至一电压供应端 （如图所示 5V 电压） 并且该漏极还连接至 第 ·开关晶体管 Q3的栅极， 一源极连接至 ·接地参考。 该第：三电阻 主要是在幵关晶 体管 Q2导通 起限流作用。 下面详细说明如何利用该侦测电路 200来进行过电流保护的。
在二维 /三维切换信号输入端输出二维状态信号^, 第二开关晶体管 截止以及第 一开关晶体管 Q3 导通， 二维显示模式下的侦测电阻值等于第一电阻和第二电阻的并联 值。
具体地， 在 2D信号输入时， 因晶体管 Q2的 Gate电压为低， 故 Q2截止。 Q3的 Gate 电压经过电阻 R5到 5V上拉作用， 故 Q3导通。 容易理解，此时 2D模式下的侦测电阻等 于电阻 R1及 R2的并联值。
在二维 /三维切换信号输入端输出三维状态信号 ， 第一幵关晶体管 Q2 导通以及第 二幵关晶体管 Q3截止， 三维显示模式 T的侦测电阻值等于第一电阻 的电阻值。
具体地， 在 3D信号输入时， 因晶体管 Q2的 Gate电压为高， 故 Q2导通， 此时导致 Q3的 Gate信号被拉到低， 因此 Q3截止， 电阻 R2不接入电路， 此时 3D模式下的侦测电 阻为 R 阻值。
最后， 控制器 100的 ISEN端根据当前侦测电阻值（ 电阻值或 与 R2的并联电阻 值）得到当前电感型升压电路 100中的电感的侦测电流， 进而根据该侦测电流进一步判断 与该侦测电流对应的侦测电压是否超出其内部的基准电压， 超出时驱动 Κ〕 300会停止工 作。这样， 由于在 2D显示模式与 3D显示模式下分别有与其工作电流相对应的侦测电阻.， 因此能够防止在 3D 显示模式下可能会出现的元件损坏或异常保护的现象。 另外， 关于第一电阻 和第二电阻 的值的大小分别通过以下表达式来计算得到;
= 其中， i?^和 z)分别是二维显示模式和 Ξ:维显示模式下的侦测电阻， 各自分别如下 表达式所示：
^7 > ― Ζ> 二 其中， 是控制器的基准电压， 7^213和 / 分别是二维显示模式和
下的电感型升压电路的电感峰值电流， 各自分别如下表达式所示； ί p. k_2D
LfV( 0_2D
I pfc— 3D
IN LfV( O 3D 其中， — 2 2D分别是二维显示模式下 LED工作所需的电流和电压， IoJD、 VojD 分别是：三维显示模式下 LED工作所需的电流和电压， 是输入电压， L是所述电感型升 压电路的电感的大小， /是电感型升压电路的幵关晶体管的开关频率。
另外， 还涉及了一种背光源 LED驱动装置， 该驱动装置包括上述的 LED升压转换 器。
综上， 本发明通过在 LED升压转换器中设置了侦测电路， 使得在 2D显示模式与 3D 显示模式下分别有与其工作电流相对应的 ISEN侦测电阻， 防止在 3D 显示模式下可能会 出现的元件损坏或异常保护的现象。
以上所述， 仅为本发明较佳的具体实施方式， 但本发明的保护范 ί簡并不局限于此， 任何熟悉 i ：的人员在本发明所揭露的技术范围内， 可轻易: 应 涵盖在本发明的保护范 I之内。 因此， 本发明的保护范围应该以权利要求的保沪范围为

Claims

权利要求书
1、 一种 LED升压转换器， 包括：
•电感型升压电路， 其用于在不同显示模式下， 将输入电压升压至当前显示模式下 所述 LED工诈所需的工作电压； 一侦测电路， 其用于在不同的显示模式下， 选择针对不同显示模式的侦测电阻以提 供侦测所述电感型升压电路的不同的侦溯电流， 所述侦测电路连接所述电感型升压电 路： 一控制器， 其用于提供脉冲宽度调制信号以驱动所述电感型升压电路工作， 以及检 测与所述侦测电流对应的侦测电压是否超过基准电压， 所述控制器包括连接所述电感型 升压电路的 GATE端和连接所述侦测电路的电流侦測输入端， 其中， 所述显示模式包括二维显示模式和≡维显示模式。
2、 根据权利要求 1所述的 LED升压转换器， 其中， 在二维显示模式的电感型升压电 路的电感峰值电流 ^— D小于 Ξ:维显示模式的电感型升压电路的电感峰值电流 ^时， 所述侦测电路进一步包括- 一第一电阻， 其一端连接至一接地参考， 另一端连接至所述电感型升压电路的开关 晶体管的一源极-
•第二电阻， 其一端同所述第一电阻一并连接至所述开关晶体管的一源极； 一第一幵关晶体管， 其一極极连接至二维 /三维切换信号输入端， 一漏极连接至所述 第二电阻的另一端， 一源极连接至一接地参考。
3、 根据权利要求: ί所述的 LED升压转换器， 其中， 在二维显示模式的电感型升压电 路的电感峰值电流 大于三维显示模式的电感型升压电路的电感峰值电流 ¼ 时， 所述侦测电路进一歩包括： 一第一电阻， 其一端连接至一接地参考， 另一端连接至所述电感型升压电路的开关 晶体管的 ·源极； 一第二电阻， 其一端同所述第一电阻一并连接至所述开关晶体管的一源极； 一第一开关晶体管， 其一漏极连接至所述第二电阻的另一端， 一源极连接至一接地 参考；
—-第三电阻； 一第二幵关晶体管， 其一極极连接至二维 /三维切换信号输入端， 一漏极通过所述第 三电阻连接至一电压供应端并且该漏极还连接至所述第一开关晶体管的一櫥极， 一源极 连接至一接地参考。
4、 根据权利要求 2所述的 LED升压转换器， 其中， 所述第一电阻和第二电阻的值的 通过以下表达式来 算得到：
― ! I 其中， ¾ 和 分别是二维显示模式和 维显示模式下的侦测电阻， 各自分别如下 表达式所示：
^2D 二
其中， 是所述控制器的基准电压， ¼_^和 ¼ 0分别是二维显示模式和 模式 T的电感型升压电路的电感峰值电流， 各自分别如下表达式所示；
, _ ^0_2D + 0— 2ΰ s 2V!N(V0_2D― V^N)
lpk_2D - 7} 十 T 7}
^ ^. ' 0_2D
h_3D + ^O^SD ， 2 N(V0 3D― VfN)
ί ,Λ: LfV( 其中， ί0 、 分别是二维显示模式下 LED工作所需的电流和电压， : o 3D、 Vo D 分别是三维显示模式下 LED工作所需的电流和电压， 是输入电压， L是所述电感型升 压电路的电感的大小， /'是所述电感型升压电路的幵关晶体管的开关频率。
5、根据权利要求 3所述的 LED 压转换器， 其中， 所述第一电阻和第 大小分别通过以下表达式来计算得到：
R-
\^2D一 U I 其中， /?； ^和 分别是二维显示模式和三维显示模式下的侦测电阻， 各自分别如下 表达式所示- pk_2D 二
Figure imgf000013_0001
pk_3D 其中， 是所述控制器的基准电压， ipU )和 分别是二维显示模式和三维显示 模式下的电感型升压电路的电感峰值电流， 各自分别如下表达式所示；
1 _
pk-2D =
Figure imgf000013_0002
pk_3D +
3D 其中， 2ΰ、 2D分别是二维显示模式下 LED工作所需的电流和电压， IOJD、 VO D 分别是三维显示模式下 LED工作所需的电流和电压， 是输入电压， L是所述电感型升 压电路的电感的大小， . 是所述电感型升压电路的开关晶体管的开关频率。
6、 根据权利要求 2所述的 LED升压转换器， 其中， 在所述二维 / 维切换信号输入端输出二维状态信号时， 所述第一开关晶体管截止， 二维显示模式下的侦测电阻值等于所述第一电阻的电阻值；
在所述二维 /:三维切换信号输入端输出 Ξ:维状态信号时， 所述第一开关晶体管导通， 维显示模式下的侦测电阻值等于所述第一电阻和所述第二电阻并联后的电阻值。
7、 根据权利要求 3所述的 LED升压转换器， 其中， 在所述二维 /三维切换信号输入端输出二维状态信号时， 所述第二开关晶体管截止和 所述第一开关晶体管导通， 二维显示模式下的侦测电阻值等于所述第一电阻和所述第二 电阻并联后的电阻值； 在所述二维 λ三维切换信号输入端输出:三维状态信号时， 所述第一开关晶体管截止和 所述第二开关晶体管导通， ：三维显示模式下的侦测电阻值等于所述第一电阻的电阻值。
8、 一种背光源 LED驱动装置， 包括：
•电感型升压电路， 其用于在不同显示模式下， 将输入电压升压至当前显示模式下 所述 LED工诈所需的工作电压； 一侦测电路， 其用于在不同的显示模式下， 选择针对不同显示模式的侦测电阻以提 供侦测所述电感型升压电路的不同的侦溯电流， 所述侦测电路连接所述电感型升压电 路： 一控制器， 其用于提供脉冲宽度调制信号以驱动所述电感型升压电路工作， 以及检 测与所述侦测电流对应的侦测电压是否超过基准电压， 所述控制器包括连接所述电感型 升压电路的 GATE端和连接所述侦测电路的电流侦測输入端， 其中， 所述显示模式包括二维显示模式和三维显示模式。
9、 根据权利要求 8所述的背光源 LED驱动装置， 其中， 在二维显示模式的电感型升 压电路的电感峰值电流 2D小于 维显示模式的电感型 压电路的电感峰值电流 i≠JD 时， 所述侦测电路进一步包括- 一第一电阻， 其一端连接至一接地参考， 另一端连接至所述电感型升压电路的开关 晶体管的一源极-
•第二电阻， 其一端同所述第一电阻一并连接至所述开关晶体管的一源极； 一第一开关晶体管， 其一樋极连接至二维 / 维切换信号输入端， 一漏极连接至所述 第二电阻的另一端， 一源极连接至一接地参考。
10、 根据权利要求 8所述的背光源 LED驱动装置， 其中， 在二维显示模式的电感型 升压电路的电感峰值电流 1≠JD大于三维显示模式的电感型升压电路的电感峰值电流 I≠JD ^ , 所述侦测电路迸一步包括： 一第一电阻， 其一端连接至一接地参考， 另一端连接至所述电感型升压电路的开关 晶体管的一源极- 一第二电阻， 其一端同所述第一电阻一并连接至所述开关晶体管的一源极； 一第一开关晶体管， 其一漏极连接至所述第二电阻的另一端， ·源极连接至一接地 参考； 一第三电阻； 一第二幵关晶体管， 其一極极连接至二维 /三维切换信号输入端， 一漏极通过所述第 三电阻连接至一电压供应端并且该漏极还连接至所述第一开关晶体管的一栅极， 一源极 连接至一接地参考。
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