WO2017152463A1 - 背光调光电路及液晶显示器 - Google Patents

背光调光电路及液晶显示器 Download PDF

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Publication number
WO2017152463A1
WO2017152463A1 PCT/CN2016/079014 CN2016079014W WO2017152463A1 WO 2017152463 A1 WO2017152463 A1 WO 2017152463A1 CN 2016079014 W CN2016079014 W CN 2016079014W WO 2017152463 A1 WO2017152463 A1 WO 2017152463A1
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Prior art keywords
constant current
resistor
electrically connected
driving chip
current driving
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Ceased
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PCT/CN2016/079014
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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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Priority to US15/032,052 priority Critical patent/US10356874B2/en
Publication of WO2017152463A1 publication Critical patent/WO2017152463A1/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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • 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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/54—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits in a series array of LEDs
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W72/00—Interconnections or connectors in packages
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133612—Electrical details
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a backlight dimming circuit and a liquid crystal display.
  • LCD Liquid Crystal Display
  • PDA personal digital assistant
  • digital camera computer screen or Laptop screens, etc.
  • liquid crystal displays which include a liquid crystal panel and a backlight module.
  • the working principle of the liquid crystal panel is to apply a driving voltage on a Thin Film Transistor Array Substrate (TFT Array Substrate) and a Color Filter (CF) to control the rotation direction of liquid crystal molecules between the two substrates.
  • TFT Array Substrate Thin Film Transistor Array Substrate
  • CF Color Filter
  • the backlight module is divided into a side-in type backlight module and a direct-type backlight module according to different incident positions of the light source.
  • a light source such as a cathode fluorescent lamp (CCFL) or a light emitting diode (LED) is disposed behind the liquid crystal panel, and a surface light source is directly formed and supplied to the liquid crystal panel.
  • the side-lit backlight module has a light bar disposed on the side of the liquid crystal panel as a backlight.
  • the dimming mode of the LED light bar as a backlight is usually to input a low frequency pulse dimming signal to the constant current driving chip to turn on or off the constant current tube connected in series with the LED light bar.
  • 1 is a circuit diagram of a conventional backlight dimming circuit, wherein a constant current driving chip 100' is provided with three pins, and a first pin 1' is used for inputting a pulse dimming signal from the outside to the constant current driving chip 100'.
  • the second pin 2' is used to output a pulse dimming signal PWM from the constant current driving chip 100' to the constant current tube Q1' to control the on or off of the constant current tube Q1', the third pin 3' For receiving the feedback current signal Isen, the constant current tube Q1' is connected in series with the LED strip 200' as a backlight.
  • the constant current driving chip 100' in the existing backlight dimming circuit requires a large package because of having three pins, which increases the cost of the backlight dimming circuit, and because of the large number of pins, the backlight is adjusted. Optical circuits are not convenient for debugging.
  • the object of the present invention is to provide a backlight dimming circuit, which can reduce the number of pins of the constant current driving chip, reduce the package size of the constant current driving chip, and improve the debugging efficiency of the backlight dimming circuit.
  • the present invention firstly provides a backlight dimming circuit, comprising: a constant current driving chip, an external dimming module electrically connected to the constant current driving chip, and an electrical connection with the external dimming module.
  • a backlight dimming circuit comprising: a constant current driving chip, an external dimming module electrically connected to the constant current driving chip, and an electrical connection with the external dimming module.
  • LED light bar ;
  • the constant current driving chip is provided with a first pin, and the external dimming module is electrically connected to the constant current driving chip through the first pin;
  • the LED strip includes a plurality of LEDs connected in series, the LED strip is connected to the backlight output voltage at one end, and electrically connected to the external dimming module at the other end;
  • the external dimming module includes: a first resistor, a second resistor, a third resistor, a diode, and a constant current tube electrically connected to each other; the external dimming module is connected to a pulse dimming signal for controlling The LED strip is turned on or off.
  • One end of the first resistor is connected to the input voltage, and the other end is electrically connected to the source of the constant current tube and the anode of the diode;
  • the anode of the diode is electrically connected to the other end of the first resistor and the source of the constant current tube, and the cathode is electrically connected to one end of the second resistor and the first pin of the constant current driving chip;
  • One end of the second resistor is electrically connected to the cathode of the diode and the first pin of the constant current driving chip, and the other end is electrically connected to one end of the third resistor and the other end of the LED strip;
  • One end of the third resistor is electrically connected to the other end of the second resistor and the other end of the LED strip, and the other end is grounded;
  • the gate of the constant current tube is connected to the pulse dimming signal, and the source is electrically connected to the other end of the first resistor and the anode of the diode, and the drain is grounded.
  • the constant current driving chip receives a feedback current through the first pin; the constant current driving chip has a preset protection voltage value built therein; the constant current driving chip is capable of applying a voltage value to the first pin and the The preset protection voltage values are compared to perform an on or off of the LED strip.
  • the voltage value of the input voltage is higher than a preset protection voltage value of the constant current driving chip.
  • the present invention also provides a liquid crystal display having a backlight dimming circuit, the backlight dimming circuit comprising: a constant current driving chip, an external dimming module electrically connected to the constant current driving chip, and the external LED strips electrically connected to the dimming module;
  • the constant current driving chip is provided with a first pin, and the external dimming module is electrically connected to the constant current driving chip through the first pin;
  • the LED strip includes a plurality of LEDs connected in series, the LED strip is connected to the backlight output voltage at one end, and electrically connected to the external dimming module at the other end;
  • the external dimming module includes: a first resistor, a second resistor, a third resistor, a diode, and a constant current tube electrically connected to each other; the external dimming module is connected to a pulse dimming signal for controlling The LED strip is turned on or off.
  • One end of the first resistor is connected to the input voltage, and the other end is electrically connected to the source of the constant current tube and the anode of the diode;
  • the anode of the diode is electrically connected to the other end of the first resistor and the source of the constant current tube, and the cathode is electrically connected to one end of the second resistor and the first pin of the constant current driving chip;
  • One end of the second resistor is electrically connected to the cathode of the diode and the first pin of the constant current driving chip, and the other end is electrically connected to one end of the third resistor and the other end of the LED strip;
  • One end of the third resistor is electrically connected to the other end of the second resistor and the other end of the LED strip, and the other end is grounded;
  • the gate of the constant current tube is connected to the pulse dimming signal, and the source is electrically connected to the other end of the first resistor and the anode of the diode, and the drain is grounded.
  • the constant current driving chip receives a feedback current through the first pin; the constant current driving chip has a preset protection voltage value built therein; the constant current driving chip is capable of applying a voltage value to the first pin and the The preset protection voltage values are compared to perform an on or off of the LED strip.
  • the voltage value of the input voltage is higher than a preset protection voltage value of the constant current driving chip.
  • the present invention also provides a backlight dimming circuit, comprising: a constant current driving chip, an external dimming module electrically connected to the constant current driving chip, and an LED light bar electrically connected to the external dimming module;
  • the constant current driving chip is provided with a first pin, and the external dimming module is electrically connected to the constant current driving chip through the first pin;
  • the LED strip includes a plurality of LEDs connected in series, the LED strip is connected to the backlight output voltage at one end, and electrically connected to the external dimming module at the other end;
  • the external dimming module includes: a first resistor, a second resistor, a third resistor, a diode, and a constant current tube electrically connected to each other; the external dimming module is connected to a pulse dimming signal for controlling Turning on or off the LED strip;
  • One end of the first resistor is connected to the input voltage, and the other end is electrically connected to the source and the second pole of the constant current tube.
  • the anode of the diode is electrically connected to the other end of the first resistor and the source of the constant current tube, and the cathode is electrically connected to one end of the second resistor and the first pin of the constant current driving chip;
  • One end of the second resistor is electrically connected to the cathode of the diode and the first pin of the constant current driving chip, and the other end is electrically connected to one end of the third resistor and the other end of the LED strip;
  • One end of the third resistor is electrically connected to the other end of the second resistor and the other end of the LED strip, and the other end is grounded;
  • the gate of the constant current tube is connected to the pulse dimming signal, and the source is electrically connected to the other end of the first resistor and the anode of the diode, and the drain is grounded;
  • the constant current driving chip receives a feedback current through the first pin; the constant current driving chip has a preset protection voltage value built therein; and the constant current driving chip can apply a voltage value to the first pin
  • the preset protection voltage values are compared to perform conduction or shutdown of the LED light bar.
  • the invention provides the backlight dimming circuit and the liquid crystal display, and the external dimming module is connected to the pulse dimming signal to control the on or off of the constant current tube in the external dimming module, thereby controlling the LED
  • the light bar is turned on or off, and the constant current driving chip only needs to set a first pin, and the LED light bar is executed by comparing the voltage value of the first pin with the preset protection voltage value of the constant current driving chip. Turning on or off can reduce the number of pins of the constant current driving chip, reduce the package size of the constant current driving chip, and improve the debugging efficiency of the backlight dimming circuit.
  • FIG. 1 is a circuit diagram of a conventional backlight dimming circuit
  • FIG. 2 is a circuit diagram of a backlight dimming circuit of the present invention.
  • the present invention firstly provides a backlight dimming circuit, comprising: a constant current driving chip 100, an external dimming module 200 electrically connected to the constant current driving chip 100, and the external dimming module 200 electrically connected LED light bar 300.
  • the constant current driving chip 100 is provided with a first pin 1 , and the external dimming module 200 is electrically connected to the constant current driving chip 100 through the first pin 1 .
  • the LED light bar 300 includes a plurality of LEDs connected in series, and one end of the LED light bar 300 is connected to the backlight output voltage Vout, and the other end is electrically connected to the external dimming module 200.
  • the external dimming module 200 includes: a first resistor R1, a second resistor R2, a third resistor R3, a diode D1, and a constant current tube Q1 electrically connected to each other; the external dimming module 200 is connected to the pulse
  • the dimming signal PWM is used to control the on or off of the LED strip 300. Further, in the external dimming module 200:
  • One end of the first resistor R1 is connected to the input voltage VCC, and the other end is electrically connected to the source of the constant current tube Q1 and the anode of the diode D1;
  • the anode of the diode D1 is electrically connected to the other end of the first resistor R1 and the source of the constant current tube Q1, the cathode is electrically connected to one end of the second resistor R2 and the first pin 1 of the constant current driving chip 100;
  • One end of the second resistor R2 is electrically connected to the cathode of the diode D1 and the first pin 1 of the constant current driving chip 100, and the other end is electrically connected to one end of the third resistor R3 and the other of the LED strip 300 One end
  • One end of the third resistor R3 is electrically connected to the other end of the second resistor R2 and the other end of the LED strip 300, and the other end is grounded;
  • the gate of the constant current tube Q1 is connected to the pulse dimming signal PWM, and the source is electrically connected to the other end of the first resistor R1 and the anode of the diode D1, and the drain is grounded.
  • the constant current driving chip 100 receives the feedback current Isen through the first pin 1.
  • the constant current driving chip 100 has a preset protection voltage value built therein.
  • the constant current driving chip 100 is capable of comparing a voltage value of the first pin 1 with the preset protection voltage value to perform turning on or off of the LED light bar 300.
  • the voltage value of the input voltage VCC in the present invention is higher than the preset protection voltage value of the constant current driving chip 100.
  • the backlight dimming circuit of the present invention controls the turn-on or turn-off of the constant current tube Q1 in the external dimming module 200 through the external dimming module 200 to access the pulse dimming signal PWM, thereby controlling the conduction of the LED strip 300 or Turning off, the constant current driving chip 100 only needs to set a first pin 1, and performs comparison on the LED light bar 300 by comparing the voltage value of the first pin 1 with the preset protection voltage value of the constant current driving chip 100. Turning on or off can reduce the number of pins of the constant current driving chip, reduce the package size of the constant current driving chip, and improve the debugging efficiency of the backlight dimming circuit.
  • the gate of the constant current tube Q1 in the external dimming module 200 is controlled by a high potential, and the constant current tube Q1 is turned on, so that The anode of the diode D1 and the source of the constant current tube Q1 are grounded, and the corresponding voltage is 0.
  • the LED strip 300 is turned on.
  • the feedback current Isen flowing into the first pin 1 of the constant current driving chip 100 is related to the backlight output voltage Vout, and is independent of the input voltage VCC, and is detected by the first pin 1.
  • the voltage value is also related to the backlight output voltage Vout, regardless of the input voltage VCC.
  • the gate of the constant current tube Q1 in the external dimming module 200 is controlled by the low potential, and the constant current tube Q1 is turned off.
  • the voltage value detected by the pin 1 is the voltage value of the input voltage VCC. Since the voltage value of the input voltage VCC is higher than the preset protection voltage value of the constant current driving chip 100, the constant current driving chip 100 is triggered to perform voltage protection.
  • the LED light bar 300 is turned off.
  • the present invention further provides a liquid crystal display having the backlight dimming circuit as shown in FIG. 2, which can reduce the number of pins of the constant current driving chip and reduce the package size of the constant current driving chip. High debugging efficiency, the backlight dimming circuit will not be described repeatedly here.
  • the backlight dimming circuit and the liquid crystal display of the present invention control the LED light bar by controlling the on or off of the constant current tube in the external dimming module by inserting a pulse dimming signal through an external dimming module.
  • the constant current driving chip only needs to set a first pin, and performs the guiding of the LED light bar by comparing the voltage value of the first pin with the preset protection voltage value of the constant current driving chip. Turning on or off can reduce the number of pins of the constant current driving chip, reduce the package size of the constant current driving chip, and improve the debugging efficiency of the backlight dimming circuit.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

一种背光调光电路及液晶显示器。该背光调光电路通过外部调光模块（200）接入脉冲调光信号（PWM）来控制该外部调光模块内恒流管（Q1）的导通或关断，从而控制LED灯条（300）的导通或关断，恒流驱动芯片（100）仅需设置一第一引脚（1），通过对第一引脚的电压值与恒流驱动芯片预设的保护电压值进行比较来执行对LED灯条的导通或关断，能够减少恒流驱动芯片的引脚数量，降低恒流驱动芯片的封装大小，提高背光调光电路的调试效率。

Description

背光调光电路及液晶显示器 技术领域
本发明涉及液晶显示技术领域，尤其涉及一种背光调光电路及液晶显示器。
背景技术
液晶显示器(Liquid Crystal Display，LCD)具有机身薄、省电、无辐射等众多优点，得到了广泛的应用，如：液晶电视、移动电话、个人数字助理(PDA)、数字相机、计算机屏幕或笔记本电脑屏幕等。
现有市场上的液晶显示器大部分为背光型液晶显示器，其包括液晶面板及背光模组(Backlight Module)。液晶面板的工作原理是在薄膜晶体管阵列基板(Thin Film Transistor Array Substrate，TFT Array Substrate)与彩色滤光片基板(Color Filter，CF)上施加驱动电压来控制两基板之间液晶分子的旋转方向，以将背光模组的光线折射出来产生画面。
由于液晶显示面板本身不发光，需要借由背光模组提供的光源来正常显示影像，因此背光模组成为液晶显示器的关键组件之一。背光模组依照光源入射位置的不同分成侧入式背光模组与直下式背光模组两种。直下式背光模组是将发光光源例如阴极萤光灯管(Cold Cathode Fluorescent Lamp，CCFL)或发光二极管(Light Emitting Diode，LED)设置在液晶面板后方，直接形成面光源提供给液晶面板。而侧入式背光模组是将LED灯条(Light bar)设于液晶面板的侧后方作为背光源。
目前，对LED灯条作为背光源的调光方式通常是向恒流驱动芯片(balance IC)输入一低频脉冲调光信号去导通或关断与LED灯条串联的恒流管。图1所示为现有的背光调光电路的电路图，其中恒流驱动芯片100’设置三个引脚，第一引脚1’用于自外部向恒流驱动芯片100’输入脉冲调光信号PWM，第二引脚2’用于自恒流驱动芯片100’向恒流管Q1’输出脉冲调光信号PWM，以控制恒流管Q1’的导通或关断，第三引脚3’用于接收反馈电流信号Isen，恒流管Q1’与作为背光源的LED灯条200’串联。该现有的背光调光电路中的恒流驱动芯片100’因为具有三个引脚，需要较大的封装，增加了背光调光电路的成本，并且由于引脚数较多，此种背光调光电路不方便进行调试。
发明内容
本发明的目的在于提供一种背光调光电路，能够减少恒流驱动芯片的引脚数量，降低恒流驱动芯片的封装大小，提高背光调光电路的调试效率。
本发明的目的还在于提供一种液晶显示器，其内的背光调光电路能够减少恒流驱动芯片的引脚数量，降低恒流驱动芯片的封装大小，具有较高的调试效率。
为实现上述目的，本发明首先提供一种背光调光电路，包括：恒流驱动芯片、与所述恒流驱动芯片电性连接的外部调光模块、以及与所述外部调光模块电性连接的LED灯条；
所述恒流驱动芯片设有第一引脚，所述外部调光模块通过第一引脚电性连接恒流驱动芯片；
所述LED灯条包括多个串联的发光二极管，所述LED灯条一端接入背光输出电压，另一端电性连接所述外部调光模块；
所述外部调光模块包括：相互电性连接的第一电阻、第二电阻、第三电阻、一二极管、及一恒流管；所述外部调光模块接入脉冲调光信号，用于控制LED灯条的导通或关断。
在所述外部调光模块中：
第一电阻的一端接入输入电压，另一端电性连接恒流管的源极及二极管的阳极；
二级管的阳极电性连接所述第一电阻的另一端及恒流管的源极，阴极电性连接第二电阻的一端及恒流驱动芯片的第一引脚；
第二电阻的一端电性连接所述二级管的阴极及恒流驱动芯片的第一引脚，另一端电性连接第三电阻的一端及所述LED灯条的另一端；
第三电阻的一端电性连接所述第二电阻的另一端及LED灯条的另一端，另一端接地；
恒流管的栅极接入脉冲调光信号，源极电性连接所述第一电阻的另一端及二极管的阳极，漏极接地。
所述恒流驱动芯片通过所述第一引脚接收反馈电流；所述恒流驱动芯片内置一预设的保护电压值；所述恒流驱动芯片能够对第一引脚的电压值与所述预设的保护电压值进行比较，以执行对LED灯条的导通或关断。
输入电压的电压值高于所述恒流驱动芯片预设的保护电压值。
本发明还提供一种液晶显示器，具有一背光调光电路，所述背光调光电路包括：恒流驱动芯片、与所述恒流驱动芯片电性连接的外部调光模块、以及与所述外部调光模块电性连接的LED灯条；
所述恒流驱动芯片设有第一引脚，所述外部调光模块通过第一引脚电性连接恒流驱动芯片；
所述LED灯条包括多个串联的发光二极管，所述LED灯条一端接入背光输出电压，另一端电性连接所述外部调光模块；
所述外部调光模块包括：相互电性连接的第一电阻、第二电阻、第三电阻、一二极管、及一恒流管；所述外部调光模块接入脉冲调光信号，用于控制LED灯条的导通或关断。
在所述外部调光模块中：
第一电阻的一端接入输入电压，另一端电性连接恒流管的源极及二极管的阳极；
二级管的阳极电性连接所述第一电阻的另一端及恒流管的源极，阴极电性连接第二电阻的一端及恒流驱动芯片的第一引脚；
第二电阻的一端电性连接所述二级管的阴极及恒流驱动芯片的第一引脚，另一端电性连接第三电阻的一端及所述LED灯条的另一端；
第三电阻的一端电性连接所述第二电阻的另一端及LED灯条的另一端，另一端接地；
恒流管的栅极接入脉冲调光信号，源极电性连接所述第一电阻的另一端及二极管的阳极，漏极接地。
所述恒流驱动芯片通过所述第一引脚接收反馈电流；所述恒流驱动芯片内置一预设的保护电压值；所述恒流驱动芯片能够对第一引脚的电压值与所述预设的保护电压值进行比较，以执行对LED灯条的导通或关断。
输入电压的电压值高于所述恒流驱动芯片预设的保护电压值。
本发明还提供一种背光调光电路，包括：恒流驱动芯片、与所述恒流驱动芯片电性连接的外部调光模块、以及与所述外部调光模块电性连接的LED灯条；
所述恒流驱动芯片设有第一引脚，所述外部调光模块通过第一引脚电性连接恒流驱动芯片；
所述LED灯条包括多个串联的发光二极管，所述LED灯条一端接入背光输出电压，另一端电性连接所述外部调光模块；
所述外部调光模块包括：相互电性连接的第一电阻、第二电阻、第三电阻、一二极管、及一恒流管；所述外部调光模块接入脉冲调光信号，用于控制LED灯条的导通或关断；
其中，在所述外部调光模块中：
第一电阻的一端接入输入电压，另一端电性连接恒流管的源极及二极 管的阳极；
二级管的阳极电性连接所述第一电阻的另一端及恒流管的源极，阴极电性连接第二电阻的一端及恒流驱动芯片的第一引脚；
第二电阻的一端电性连接所述二级管的阴极及恒流驱动芯片的第一引脚，另一端电性连接第三电阻的一端及所述LED灯条的另一端；
第三电阻的一端电性连接所述第二电阻的另一端及LED灯条的另一端，另一端接地；
恒流管的栅极接入脉冲调光信号，源极电性连接所述第一电阻的另一端及二极管的阳极，漏极接地；
其中，所述恒流驱动芯片通过所述第一引脚接收反馈电流；所述恒流驱动芯片内置一预设的保护电压值；所述恒流驱动芯片能够对第一引脚的电压值与所述预设的保护电压值进行比较，以执行对LED灯条的导通或关断。
本发明的有益效果：本发明提供的背光调光电路及液晶显示器，通过外部调光模块接入脉冲调光信号来控制该外部调光模块内恒流管的导通或关断，从而控制LED灯条的导通或关断，恒流驱动芯片仅需设置一第一引脚，通过对第一引脚的电压值与恒流驱动芯片预设的保护电压值进行比较来执行对LED灯条的导通或关断，能够减少恒流驱动芯片的引脚数量，降低恒流驱动芯片的封装大小，提高背光调光电路的调试效率。
附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为现有的背光调光电路的电路图；
图2为本发明的背光调光电路的电路图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图2，本发明首先提供一种背光调光电路，包括：恒流驱动芯片100、与所述恒流驱动芯片100电性连接的外部调光模块200、以及与所述外部调光模块200电性连接的LED灯条300。
具体地，所述恒流驱动芯片100设有第一引脚1，所述外部调光模块200通过第一引脚1电性连接恒流驱动芯片100。
所述LED灯条300包括多个串联的发光二极管，所述LED灯条300一端接入背光输出电压Vout，另一端电性连接所述外部调光模块200。
所述外部调光模块200包括：相互电性连接的第一电阻R1、第二电阻R2、第三电阻R3、一二极管D1、及一恒流管Q1；所述外部调光模块200接入脉冲调光信号PWM，用于控制LED灯条300的导通或关断。进一步地，在所述外部调光模块200中：
第一电阻R1的一端接入输入电压VCC，另一端电性连接恒流管Q1的源极及二极管D1的阳极；
二级管D1的阳极电性连接所述第一电阻R1的另一端及恒流管Q1的源极，阴极电性连接第二电阻R2的一端及恒流驱动芯片100的第一引脚1；
第二电阻R2的一端电性连接所述二级管D1的阴极及恒流驱动芯片100的第一引脚1，另一端电性连接第三电阻R3的一端及所述LED灯条300的另一端；
第三电阻R3的一端电性连接所述第二电阻R2的另一端及LED灯条300的另一端，另一端接地；
恒流管Q1的栅极接入脉冲调光信号PWM，源极电性连接所述第一电阻R1的另一端及二极管D1的阳极，漏极接地。
所述恒流驱动芯片100通过所述第一引脚1接收反馈电流Isen。所述恒流驱动芯片100内置一预设的保护电压值。所述恒流驱动芯片100能够对第一引脚1的电压值与所述预设的保护电压值进行比较，以执行对LED灯条300的导通或关断。
值得注意的是，本发明中输入电压VCC的电压值高于所述恒流驱动芯片100预设的保护电压值。
本发明的背光调光电路通过外部调光模块200接入脉冲调光信号PWM来控制该外部调光模块200内恒流管Q1的导通或关断，从而控制LED灯条300的导通或关断，恒流驱动芯片100仅需设置一第一引脚1，通过对第一引脚1的电压值与恒流驱动芯片100预设的保护电压值进行比较来执行对LED灯条300的导通或关断，能够减少恒流驱动芯片的引脚数量，降低恒流驱动芯片的封装大小，提高背光调光电路的调试效率。
具体地，当向外部调光模块200输入的脉冲调光信号PWM为高电位时，外部调光模块200内恒流管Q1的栅极受高电位控制，该恒流管Q1导通，使得所述二极管D1的阳极和恒流管Q1的源极接地，相应的电压为0， 所述LED灯条300导通，此时，流入恒流驱动芯片100第一引脚1的反馈电流Isen与背光输出电压Vout有关，与输入电压VCC无关，该第一引脚1侦测到的电压值亦与背光输出电压Vout有关，与输入电压VCC无关。向外部调光模块200输入的脉冲调光信号PWM变为低电位时，外部调光模块200内恒流管Q1的栅极受低电位控制，该恒流管Q1关断，此时，第一引脚1侦测到的电压值即为输入电压VCC的电压值，由于输入电压VCC的电压值高于所述恒流驱动芯片100预设的保护电压值，触发恒流驱动芯片100进行电压保护，LED灯条300关断。
基于同一发明构思，本发明还提供一种液晶显示器，其具有上述如图2所示的背光调光电路，能够减少恒流驱动芯片的引脚数量，降低恒流驱动芯片的封装大小，具有较高的调试效率，此处不再对该背光调光电路进行重复性描述。
综上所述，本发明的背光调光电路及液晶显示器，通过外部调光模块接入脉冲调光信号来控制该外部调光模块内恒流管的导通或关断，从而控制LED灯条的导通或关断，恒流驱动芯片仅需设置一第一引脚，通过对第一引脚的电压值与恒流驱动芯片预设的保护电压值进行比较来执行对LED灯条的导通或关断，能够减少恒流驱动芯片的引脚数量，降低恒流驱动芯片的封装大小，提高背光调光电路的调试效率。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (10)

  1. 一种背光调光电路，包括：恒流驱动芯片、与所述恒流驱动芯片电性连接的外部调光模块、以及与所述外部调光模块电性连接的LED灯条；
    所述恒流驱动芯片设有第一引脚，所述外部调光模块通过第一引脚电性连接恒流驱动芯片；
    所述LED灯条包括多个串联的发光二极管，所述LED灯条一端接入背光输出电压，另一端电性连接所述外部调光模块；
    所述外部调光模块包括：相互电性连接的第一电阻、第二电阻、第三电阻、一二极管、及一恒流管；所述外部调光模块接入脉冲调光信号，用于控制LED灯条的导通或关断。
  2. 如权利要求1所述的背光调光电路，其中，在所述外部调光模块中：
    第一电阻的一端接入输入电压，另一端电性连接恒流管的源极及二极管的阳极；
    二级管的阳极电性连接所述第一电阻的另一端及恒流管的源极，阴极电性连接第二电阻的一端及恒流驱动芯片的第一引脚；
    第二电阻的一端电性连接所述二级管的阴极及恒流驱动芯片的第一引脚，另一端电性连接第三电阻的一端及所述LED灯条的另一端；
    第三电阻的一端电性连接所述第二电阻的另一端及LED灯条的另一端，另一端接地；
    恒流管的栅极接入脉冲调光信号，源极电性连接所述第一电阻的另一端及二极管的阳极，漏极接地。
  3. 如权利要求1所述的背光调光电路，其中，所述恒流驱动芯片通过所述第一引脚接收反馈电流；所述恒流驱动芯片内置一预设的保护电压值；所述恒流驱动芯片能够对第一引脚的电压值与所述预设的保护电压值进行比较，以执行对LED灯条的导通或关断。
  4. 如权利要求3所述的背光调光电路，其中，输入电压的电压值高于所述恒流驱动芯片预设的保护电压值。
  5. 一种液晶显示器，具有一背光调光电路，所述背光调光电路包括：恒流驱动芯片、与所述恒流驱动芯片电性连接的外部调光模块、以及与所述外部调光模块电性连接的LED灯条；
    所述恒流驱动芯片设有第一引脚，所述外部调光模块通过第一引脚电性连接恒流驱动芯片；
    所述LED灯条包括多个串联的发光二极管，所述LED灯条一端接入背光输出电压，另一端电性连接所述外部调光模块；
    所述外部调光模块包括：相互电性连接的第一电阻、第二电阻、第三电阻、一二极管、及一恒流管；所述外部调光模块接入脉冲调光信号，用于控制LED灯条的导通或关断。
  6. 如权利要求5所述的液晶显示器，其中，在所述外部调光模块中：
    第一电阻的一端接入输入电压，另一端电性连接恒流管的源极及二极管的阳极；
    二级管的阳极电性连接所述第一电阻的另一端及恒流管的源极，阴极电性连接第二电阻的一端及恒流驱动芯片的第一引脚；
    第二电阻的一端电性连接所述二级管的阴极及恒流驱动芯片的第一引脚，另一端电性连接第三电阻的一端及所述LED灯条的另一端；
    第三电阻的一端电性连接所述第二电阻的另一端及LED灯条的另一端，另一端接地；
    恒流管的栅极接入脉冲调光信号，源极电性连接所述第一电阻的另一端及二极管的阳极，漏极接地。
  7. 如权利要求5所述的液晶显示器，其中，所述恒流驱动芯片通过所述第一引脚接收反馈电流；所述恒流驱动芯片内置一预设的保护电压值；所述恒流驱动芯片能够对第一引脚的电压值与所述预设的保护电压值进行比较，以执行对LED灯条的导通或关断。
  8. 如权利要求7所述的液晶显示器，其中，输入电压的电压值高于所述恒流驱动芯片预设的保护电压值。
  9. 一种背光调光电路，包括：恒流驱动芯片、与所述恒流驱动芯片电性连接的外部调光模块、以及与所述外部调光模块电性连接的LED灯条；
    所述恒流驱动芯片设有第一引脚，所述外部调光模块通过第一引脚电性连接恒流驱动芯片；
    所述LED灯条包括多个串联的发光二极管，所述LED灯条一端接入背光输出电压，另一端电性连接所述外部调光模块；
    所述外部调光模块包括：相互电性连接的第一电阻、第二电阻、第三电阻、一二极管、及一恒流管；所述外部调光模块接入脉冲调光信号，用于控制LED灯条的导通或关断；
    其中，在所述外部调光模块中：
    第一电阻的一端接入输入电压，另一端电性连接恒流管的源极及二极管的阳极；
    二级管的阳极电性连接所述第一电阻的另一端及恒流管的源极，阴极电性连接第二电阻的一端及恒流驱动芯片的第一引脚；
    第二电阻的一端电性连接所述二级管的阴极及恒流驱动芯片的第一引脚，另一端电性连接第三电阻的一端及所述LED灯条的另一端；
    第三电阻的一端电性连接所述第二电阻的另一端及LED灯条的另一端，另一端接地；
    恒流管的栅极接入脉冲调光信号，源极电性连接所述第一电阻的另一端及二极管的阳极，漏极接地；
    其中，所述恒流驱动芯片通过所述第一引脚接收反馈电流；所述恒流驱动芯片内置一预设的保护电压值；所述恒流驱动芯片能够对第一引脚的电压值与所述预设的保护电压值进行比较，以执行对LED灯条的导通或关断。
  10. 如权利要求9所述的背光调光电路，其中，输入电压的电压值高于所述恒流驱动芯片预设的保护电压值。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108780627A (zh) * 2017-06-26 2018-11-09 华为技术有限公司 一种液晶显示屏的背光功率控制方法及液晶显示屏

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107703069B (zh) * 2016-08-05 2021-08-03 广东达元食品药品安全技术有限公司 基于恒定电流的分光光度计食品安全检测方法
CN108617049A (zh) * 2016-12-09 2018-10-02 天津工大海宇照明部品有限公司 一种可调光led室内灯发光体
CN107025885B (zh) 2017-06-14 2019-06-21 京东方科技集团股份有限公司 一种背光源发光亮度调节电路、背光源发光亮度调节系统及方法
CN108488642B (zh) * 2018-05-25 2024-08-27 深圳市明微电子股份有限公司 一种发光二极管照明装置和发光二极管单元
CN110691449A (zh) * 2019-10-01 2020-01-14 张素贞 基于桥单元的双色led驱动电路及led照明装置
CN114648964B (zh) * 2022-03-28 2023-10-17 Tcl华星光电技术有限公司 驱动集成电路、背光模组及显示装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102262860A (zh) * 2011-06-13 2011-11-30 惠州市德赛汽车电子有限公司 一种液晶显示器及其背光驱动装置
CN103093729A (zh) * 2013-02-28 2013-05-08 深圳市华星光电技术有限公司 具有双boost升压线路的背光驱动电路
CN103150997A (zh) * 2013-03-01 2013-06-12 深圳市华星光电技术有限公司 Led背光驱动电路

Family Cites Families (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7633463B2 (en) * 2004-04-30 2009-12-15 Analog Devices, Inc. Method and IC driver for series connected R, G, B LEDs
US8193795B2 (en) * 2005-01-05 2012-06-05 Exar, Inc. Output current and input power regulation with a power converter
KR100638723B1 (ko) * 2005-02-04 2006-10-30 삼성전기주식회사 Led 어레이 구동 장치 및 이를 이용한 백라이트 구동 장치
US7928662B2 (en) * 2006-12-18 2011-04-19 Microsemi Corp.—Analog Mixed Signal Group Ltd. Voltage range extender mechanism
US7948468B2 (en) * 2007-02-23 2011-05-24 The Regents Of The University Of Colorado Systems and methods for driving multiple solid-state light sources
US20090187925A1 (en) * 2008-01-17 2009-07-23 Delta Electronic Inc. Driver that efficiently regulates current in a plurality of LED strings
US8169150B2 (en) * 2008-08-19 2012-05-01 Microsemi Corp.—Analog Mixed Signal Group Ltd. Powering and controlling light emitting diodes via thermally separated arrays of dissipative active elements
TWI405502B (zh) * 2009-08-13 2013-08-11 Novatek Microelectronics Corp 發光二極體的調光電路及其隔離型電壓產生器與調光方法
KR101476858B1 (ko) * 2009-10-08 2014-12-26 엘지디스플레이 주식회사 액정표시장치
WO2011055533A1 (ja) * 2009-11-04 2011-05-12 ローム株式会社 バックライト用ｌｅｄストリングの駆動回路および駆動方法、ならびにそれを用いたバックライトおよびディスプレイ装置
JP5608394B2 (ja) * 2010-03-09 2014-10-15 株式会社ジャパンディスプレイ 液晶表示装置
CN102238768B (zh) * 2010-04-26 2014-04-09 光宝电子(广州)有限公司 发光二极管背光源驱动模块
WO2012014588A1 (ja) * 2010-07-29 2012-02-02 シャープ株式会社 発光装置、表示装置、発光素子駆動回路、および発光素子駆動方法
US8692482B2 (en) * 2010-12-13 2014-04-08 Allegro Microsystems, Llc Circuitry to control a switching regulator
US8476843B2 (en) * 2011-01-17 2013-07-02 TPV Electronics (Fujian) Co., Ltd. Driving circuit for single-string LED lamp
JP5942314B2 (ja) * 2011-02-22 2016-06-29 パナソニックＩｐマネジメント株式会社 点灯装置および、これを用いた照明器具
KR20120114023A (ko) * 2011-04-06 2012-10-16 삼성디스플레이 주식회사 백라이트 유닛 및 이를 포함하는 표시 장치
US8471483B2 (en) * 2011-04-20 2013-06-25 Chicony Power Technology Co., Ltd. Multi-channel LED driving system
US9155156B2 (en) * 2011-07-06 2015-10-06 Allegro Microsystems, Llc Electronic circuits and techniques for improving a short duty cycle behavior of a DC-DC converter driving a load
US20130044272A1 (en) * 2011-08-18 2013-02-21 Xinming Gao LED Backlight Driving Method, LED Backlight Driving Circuit and Liquid Crystal Display Device
KR101971287B1 (ko) * 2011-08-30 2019-04-23 매그나칩 반도체 유한회사 Ｌｅｄ구동장치
US9875697B2 (en) * 2011-08-30 2018-01-23 Magnachip Semiconductor, Ltd. Parallel constant current LED driving units for driving a LED string and method of performing the same
US8853958B2 (en) * 2011-11-22 2014-10-07 Cree, Inc. Driving circuits for solid-state lighting apparatus with high voltage LED components and related methods
KR101941286B1 (ko) * 2011-12-07 2019-01-23 매그나칩 반도체 유한회사 Ｌｅｄ 구동장치
KR20130072175A (ko) * 2011-12-21 2013-07-01 서울반도체 주식회사 백라이트 모듈과 그 구동 방법 및 이를 이용하는 디스플레이 장치
US9548021B2 (en) * 2012-06-01 2017-01-17 Samsung Display Co., Ltd. Method of driving light-source and display apparatus for performing the method
US20140049730A1 (en) * 2012-08-15 2014-02-20 Texas Instruments Incorporated Led driver with boost converter current control
US9271379B2 (en) * 2012-11-16 2016-02-23 Apple Inc. Redundant operation of a backlight unit of a display device under open circuit or short circuit LED string conditions
CN202930012U (zh) * 2012-11-29 2013-05-08 四川长虹光电有限公司 恒流mosfet电路
CN103050096B (zh) * 2013-01-21 2015-10-28 深圳市华星光电技术有限公司 背光驱动电路过压保护方法
US9131583B2 (en) * 2013-03-01 2015-09-08 Shenzhen China Star Optoelectronics Technology Co., Ltd. LED backlight drive circuit
US9018859B2 (en) * 2013-03-29 2015-04-28 Shenzhen China Star Optoelectronics Technology Co., Ltd. LED backlight driving circuit and LCD device
US9183788B2 (en) * 2013-05-20 2015-11-10 Shenzhen China Star Optoelectronics Technology Co., Ltd Backlight driving circuit, LCD device, and method for driving the backlight driving circuit
US9241377B2 (en) * 2013-05-20 2016-01-19 Shenzhen China Star Optoelectronics Technology Co., Ltd LED backlight driving circuit, LCD device, and method for driving the LED backlight driving circuit
US9271361B2 (en) * 2013-05-28 2016-02-23 Shenzhen China Star Optoelectronics Technology Co., Ltd Backlight driving circuit, LCD device, and method for driving the backlight driving circuit
CN103500558B (zh) * 2013-10-21 2016-04-27 深圳市华星光电技术有限公司 一种led背光驱动电路和驱动方法
KR102126534B1 (ko) * 2013-10-31 2020-06-25 엘지디스플레이 주식회사 광원 구동장치 및 이를 이용한 액정표시장치
KR102158801B1 (ko) * 2013-11-29 2020-09-23 삼성디스플레이 주식회사 발광 다이오드를 포함하는 발광 장치 및 그 구동 방법
WO2015114958A1 (ja) * 2014-01-28 2015-08-06 シャープ株式会社 発光ダイオード駆動装置及び照明装置
US9491824B2 (en) * 2014-08-05 2016-11-08 Svetlana Eden Method and apparatus for precise temperature brightness compensation of LED
WO2016051739A1 (ja) * 2014-09-30 2016-04-07 パナソニックＩｐマネジメント株式会社 点灯装置
US10178727B2 (en) * 2015-02-27 2019-01-08 Diodes Incorporated Analog and digital dimming control for LED driver
US10278242B2 (en) * 2015-04-09 2019-04-30 Diddes Incorporated Thermal and power optimization for linear regulator
JP6594690B2 (ja) * 2015-07-22 2019-10-23 ローム株式会社 電流ドライバ、ｌｅｄ駆動回路、照明装置、電子機器
KR101967950B1 (ko) * 2016-05-17 2019-04-11 매그나칩 반도체 유한회사 과열 방지 기능을 구비한 다채널 led 구동 장치

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102262860A (zh) * 2011-06-13 2011-11-30 惠州市德赛汽车电子有限公司 一种液晶显示器及其背光驱动装置
CN103093729A (zh) * 2013-02-28 2013-05-08 深圳市华星光电技术有限公司 具有双boost升压线路的背光驱动电路
CN103150997A (zh) * 2013-03-01 2013-06-12 深圳市华星光电技术有限公司 Led背光驱动电路

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108780627A (zh) * 2017-06-26 2018-11-09 华为技术有限公司 一种液晶显示屏的背光功率控制方法及液晶显示屏

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