CN105592595B - 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

Info

Publication number
CN105592595B
CN105592595B CN201610130393.7A CN201610130393A CN105592595B CN 105592595 B CN105592595 B CN 105592595B CN 201610130393 A CN201610130393 A CN 201610130393A CN 105592595 B CN105592595 B CN 105592595B
Authority
CN
China
Prior art keywords
constant
electrically connected
driven chip
current driven
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201610130393.7A
Other languages
English (en)
Other versions
CN105592595A (zh
Inventor
李文东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to CN201610130393.7A priority Critical patent/CN105592595B/zh
Priority to PCT/CN2016/079014 priority patent/WO2017152463A1/zh
Priority to US15/032,052 priority patent/US10356874B2/en
Publication of CN105592595A publication Critical patent/CN105592595A/zh
Application granted granted Critical
Publication of CN105592595B publication Critical patent/CN105592595B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00Details of semiconductor or other solid state devices
    • H01L23/48Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
    • H01L23/50Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor for integrated circuit devices, e.g. power bus, number of leads
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10Controlling the intensity of the light
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30Driver circuits
    • H05B45/395Linear regulators
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/54Circuit 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
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133603Direct backlight with LEDs
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133612Electrical details
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

本发明提供的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(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。

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 FilmTransistor 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 (6)

1.一种背光调光电路,其特征在于,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);
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;
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。
2.如权利要求1所述的背光调光电路,其特征在于,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。
3.如权利要求2所述的背光调光电路,其特征在于,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。
4.一种液晶显示器,其特征在于,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(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);
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;
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。
5.如权利要求4所述的液晶显示器,其特征在于,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。
6.如权利要求5所述的液晶显示器,其特征在于,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。
CN201610130393.7A 2016-03-08 2016-03-08 背光调光电路及液晶显示器 Active CN105592595B (zh)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201610130393.7A CN105592595B (zh) 2016-03-08 2016-03-08 背光调光电路及液晶显示器
PCT/CN2016/079014 WO2017152463A1 (zh) 2016-03-08 2016-04-12 背光调光电路及液晶显示器
US15/032,052 US10356874B2 (en) 2016-03-08 2016-04-12 Backlighting dimming circuit and liquid crystal display

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610130393.7A CN105592595B (zh) 2016-03-08 2016-03-08 背光调光电路及液晶显示器

Publications (2)

Publication Number Publication Date
CN105592595A CN105592595A (zh) 2016-05-18
CN105592595B true CN105592595B (zh) 2017-06-27

Family

ID=55931686

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610130393.7A Active CN105592595B (zh) 2016-03-08 2016-03-08 背光调光电路及液晶显示器

Country Status (3)

Country Link
US (1) US10356874B2 (zh)
CN (1) CN105592595B (zh)
WO (1) WO2017152463A1 (zh)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106023908B (zh) * 2016-07-25 2018-09-04 昆山龙腾光电有限公司 用于液晶显示装置的背光驱动电路和控制方法
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
WO2019000157A1 (zh) * 2017-06-26 2019-01-03 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
CN108488642A (zh) * 2018-05-25 2018-09-04 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
CN103050096A (zh) * 2013-01-21 2013-04-17 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
CN202930012U (zh) * 2012-11-29 2013-05-08 四川长虹光电有限公司 恒流mosfet电路
US8816953B2 (en) * 2009-10-08 2014-08-26 Lg Display Co., Ltd. Liquid crystal display and scanning back light driving method thereof

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
JPWO2011055533A1 (ja) * 2009-11-04 2013-03-28 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
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
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
CN103093729B (zh) * 2013-02-28 2015-07-29 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
CN103150997B (zh) * 2013-03-01 2015-02-04 深圳市华星光电技术有限公司 Led背光驱动电路
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
US8816953B2 (en) * 2009-10-08 2014-08-26 Lg Display Co., Ltd. Liquid crystal display and scanning back light driving method thereof
CN202930012U (zh) * 2012-11-29 2013-05-08 四川长虹光电有限公司 恒流mosfet电路
CN103050096A (zh) * 2013-01-21 2013-04-17 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

Also Published As

Publication number Publication date
WO2017152463A1 (zh) 2017-09-14
US10356874B2 (en) 2019-07-16
CN105592595A (zh) 2016-05-18
US20180092170A1 (en) 2018-03-29

Similar Documents

Publication Publication Date Title
CN105592595B (zh) 背光调光电路及液晶显示器
CN107564470B (zh) 一种有机发光显示面板的亮度调节方法及相关装置
US11868002B2 (en) Backlight module and display device having same
US8896230B1 (en) Backlight drive circuit with dual boost circuits
CN104505034B (zh) 液晶显示装置、背光模块及其背光源驱动电路
KR100679410B1 (ko) 발광 다이오드의 구동 장치
US9095024B1 (en) Backlight driving circuit and method for reducing soft-start time thereof
CN101340760B (zh) 发光控制电路、发光控制方法、平面照明装置和具有该平面照明装置的液晶显示装置
US9105219B2 (en) Light emitting element drive device, light emitting element drive method, and display apparatus
US9185763B2 (en) Light emitting diode string driving method
US20150221258A1 (en) Backlight driving circuit, driving method and backlight module
WO2014146308A1 (zh) 背光驱动板以及液晶显示器
WO2017152467A1 (zh) 适应不同液晶面板的背光亮度自动调整系统及液晶显示器
US7268766B2 (en) Inverter driving apparatus and liquid crystal display including inverter driving apparatus
WO2014110850A1 (zh) 背光驱动电路过压保护方法
US20130147381A1 (en) Driving circuit and driving method for light emitting diode and display apparatus using the same
CN1490785A (zh) 驱动显示器件的光源的驱动装置
CN109389947A (zh) 显示设备
US9018859B2 (en) LED backlight driving circuit and LCD device
CN107481679A (zh) 一种led双背光控制电路及双背光led装置
US9489898B2 (en) LED boost converter and backlight LED driver device using the same
CN204069062U (zh) 显示屏及终端
US11114024B2 (en) Method for maintaining LED brightness, LED driving circuit and display device
CN112992083A (zh) 驱动电路、显示面板以及显示装置
KR101216172B1 (ko) 액정 표시 장치

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant