WO2014005335A1 - 一种led背光驱动电路、背光模组及液晶显示装置 - Google Patents

一种led背光驱动电路、背光模组及液晶显示装置 Download PDF

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Publication number
WO2014005335A1
WO2014005335A1 PCT/CN2012/078339 CN2012078339W WO2014005335A1 WO 2014005335 A1 WO2014005335 A1 WO 2014005335A1 CN 2012078339 W CN2012078339 W CN 2012078339W WO 2014005335 A1 WO2014005335 A1 WO 2014005335A1
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WIPO (PCT)
Prior art keywords
led light
resistor
light bar
led
output end
Prior art date
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Ceased
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PCT/CN2012/078339
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English (en)
French (fr)
Inventor
杨翔
廖良展
林柏伸
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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 DE201211006511 priority Critical patent/DE112012006511T5/de
Priority to US13/578,140 priority patent/US8680780B2/en
Publication of WO2014005335A1 publication Critical patent/WO2014005335A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • 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]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to an LED backlight driving circuit, a backlight module, and a liquid crystal display device.
  • the existing liquid crystal display device mostly uses LED as a backlight source.
  • the specific principle is that a plurality of LEDs and the like are connected in series to form one LED light bar. More than a large-sized liquid crystal display device, multiple LED strips need to be connected in parallel, and each LED lamp is used.
  • the strip is connected in series with a dimming controllable switch for dimming. When the LED strip is short-circuited, or a string of LED strips has several LEDs short-circuited, the dimming controllable switch will withstand high voltage difference when it is turned off, which may cause dimming. The control switch is damaged.
  • the technical problem to be solved by the present invention is to provide an LED backlight driving circuit, a backlight module and a liquid crystal display device which solve the problem of withstand voltage of a dimmable controllable switch when it is turned off.
  • An LED backlight driving circuit includes an LED light bar and a control module, the control module includes a dimming controllable switch, the LED light bar is connected in series with the dimming controllable switch, and the dimming controllable switch is A varistor is provided in parallel with the terminals.
  • the output end of the LED light bar is further coupled with a clamp circuit that limits the voltage of the dimmable controllable switch.
  • the clamp circuit can forcibly lower the voltage of the dimmable controllable switch, so as to prevent the dimming controllable switch from being protected when the varistor is damaged or the reaction speed is insufficient. The problem of withstand voltage of the dimmable controllable switch is solved, and the reliability of the drive is improved.
  • the clamping circuit comprises a storage capacitor and a discharge resistor arranged in parallel, one end of the storage capacitor and the discharge resistor is coupled with a reference voltage, and the other end is coupled to an output end of the LED strip; the reference voltage is less than voltage.
  • the voltage ie, the voltage of the dimmable controllable switch
  • the storage capacitor absorbs the power of the branch of the LED strip and pulls down the voltage of the dimmable controllable switch.
  • the storage capacitor and the discharge resistor are coupled to an output end of the LED strip by a diode, an anode of the diode is connected to an output end of the LED strip, and a cathode is connected to the storage capacitor and the discharge resistor.
  • diodes can avoid current reversal, protect the branch of the LED strip from interference from other control branches, and improve the stability of the system.
  • a first resistor and a second resistor are connected in series between the power input end and the ground end of the LED backlight driving circuit, and a feedback end of the control module and a cathode of the diode are respectively coupled to the first Between the resistor and the second resistor.
  • This is a specific overvoltage protection circuit that collects the voltage at the output of the LED strip by resistor divider. When the voltage is too high, the dimming controllable switch is turned off to further protect the dimmable control switch.
  • the LED light bar has a plurality of strings, and the output terminals of each string of LED light bars are separately provided with the varistor in parallel.
  • each string of LED strips is connected in parallel with a separate varistor, and the varistor of a string of LED strips is destroyed, which does not affect the normal operation of other LED strips.
  • the LED strip has a plurality of strings, and the output of each string of LED strips is connected to the same varistor. Since multiple LED strips are short-circuited at the same time, the common varistor can reduce the cost and reduce the cost.
  • the output end of the LED light bar is further coupled with a clamp circuit for limiting the voltage of the dimmable controllable switch;
  • the clamp circuit includes a storage capacitor and a discharge resistor disposed in parallel, and one end of the storage capacitor and the discharge resistor Coupled with a reference voltage, the other end is coupled to the output end of the LED strip by a diode; the reference voltage is less than the power supply voltage; the anode of the diode is connected to the output end of the LED strip, and the cathode is a storage capacitor and a discharge resistor are connected; a first resistor and a second resistor are connected in series between the power input end and the ground end of the LED backlight driving circuit, and a feedback end of the control module and a cathode of the diode are respectively coupled Between the first resistor and the second resistor.
  • a backlight module includes the above LED backlight driving circuit.
  • a liquid crystal display device includes the above backlight module.
  • the varistor is connected in parallel at both ends of the dimmable controllable switch, when the dimmer switch is turned on, the current of the LED strip branch increases, and under the premise that the total voltage is constant, the current increases, and the LED strip bears
  • the voltage of the dimmable controllable switch is correspondingly reduced.
  • the voltage of the varistor connected in parallel is also small, and the varistor is in a high resistance state.
  • the dimmable controllable switch is turned off, the branch current suddenly decreases. At this time, the voltage carried by the LED strip is also greatly reduced, and the voltage across the dimmable controllable switch is increased. At this time, the parallel varistor is high.
  • the resistance is reduced under the action of voltage, and the current of the new branch formed by the LED strip and the varistor is increased, so that the voltage under the LED strip is increased, and the voltage across the dimmable switch is lowered.
  • the problem that the withstand voltage is too high when the dimmable controllable switch is turned off is solved.
  • FIG. 1 is a schematic diagram of the principle of an embodiment of the present invention.
  • a liquid crystal display device comprises a liquid crystal display device and a backlight module
  • the backlight module comprises an LED backlight driving circuit.
  • the LED backlight driving circuit of the invention comprises an LED light bar and a control module
  • the control module comprises a dimmable controllable switch, the LED light
  • the strip is connected in series with the dimming controllable switch, and a varistor is arranged in parallel at both ends of the dimmable controllable switch.
  • the varistor is connected in parallel at both ends of the dimmable controllable switch, when the dimmer switch is turned on, the current of the LED strip branch increases, and under the premise that the total voltage is constant, the current increases, and the LED strip bears
  • the voltage of the dimmable controllable switch is correspondingly reduced.
  • the voltage of the varistor connected in parallel is also small, and the varistor is in a high resistance state.
  • the dimmable controllable switch is turned off, the branch current suddenly decreases. At this time, the voltage carried by the LED strip is also greatly reduced, and the voltage across the dimmable controllable switch is increased. At this time, the parallel varistor is high.
  • the resistance is reduced under the action of voltage, and the current of the new branch formed by the LED strip and the varistor is increased, so that the voltage under the LED strip is increased.
  • the voltage across the photo-controllable switch drops, which solves the problem of high withstand voltage when the dimmable controllable switch is turned off.
  • the LED backlight driving circuit includes a plurality of parallel LED strips, each of which has a dimming controllable switch Q1 connected in series (ie, the output end of the LED strip is connected to dimming) Controllable switch Q1), dimmable controllable switch Q1 is integrated in the control module (ie IC in the figure), the PWM output signal is controlled by the IC output PWM signal to control the dimming controllable switch Q1, and the LED light bar is realized by adjusting the duty ratio of the PWM Dimming.
  • Dimmable controllable switch Q1 has a varistor Rl connected in parallel.
  • the output end of the LED strip is also coupled with a clamp circuit for limiting the dimmable controllable switch voltage;
  • the clamp circuit includes a storage capacitor and a discharge resistor arranged in parallel, and one end of the storage capacitor C1 and the discharge resistor R2 is coupled with a reference voltage VIN, and One end is coupled to the output end of the LED strip through a diode D8; the anode of the diode D8 is connected to the output end of the LED strip, the cathode is connected to the storage capacitor C1 and the discharge resistor R2; the reference voltage VIN is less than the supply voltage VOUT.
  • the clamp circuit can forcibly pull down the voltage of the dimmable controllable switch, so as to prevent the dimming controllable switch from being protected when the varistor is damaged or the reaction speed is insufficient.
  • the output voltage of the LED strip ie, the voltage of the dimmable controllable switch
  • the storage capacitor absorbs the power of the branch of the LED strip and pulls down the voltage of the dimmable controllable switch.
  • the clamping circuit further solves the withstand voltage problem of the dimmable controllable switch and improves the reliability of the driving.
  • the use of diodes can avoid current reversal, protect the branch of the LED strip from interference from other control branches, and improve the stability of the system.
  • a first resistor R3 and a second resistor R4 are connected in series between the power input end and the ground end of the LED backlight driving circuit, and the feedback end of the IC and the cathode of the diode are respectively coupled between the first resistor and the second resistor, that is, the IC
  • the feedback end is coupled to the output end of the LED light bar through a diode, and can detect the voltage of the dimmable controllable switch. Once the overvoltage phenomenon occurs, the IC itself can adopt overvoltage protection, turn off the dimming controllable switch, and protect the dimming. Controllable switches further enhance reliability.
  • independent output varistor can be separately arranged in parallel at the output end of each string of LED strips.
  • each string of LED strips is connected in parallel with a separate varistor, and the varistor of a string of LED strips is destroyed, which does not affect the normal operation of other LED strips.
  • multiple LED strips are short-circuited at the same time, because It is also feasible that the output of each string of LED strips is connected to the same varistor, and the common varistor can be used to reduce the cost.

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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)
  • Led Devices (AREA)

Description

一种 LED背光驱动电路、 背光模组及液晶显示装置
【技术领域】
本发明涉及液晶显示领域， 更具体的说， 涉及一种 LED背光驱动电路、 背 光模组及液晶显示装置。
【背景技术】
现有的液晶显示装置多采用 LED作为背光源， 具体原理是将多个 LED等 串联成一条 LED灯条， 多于大尺寸的液晶显示装置，需要并联多条 LED灯条使 用， 每条 LED灯条串联一个调光可控开关进行调光， 当 LED灯条发生短路， 或 一串 LED灯条有若干颗 LED短路时，调光可控开关关断时会承受高压差，容易 造成调光可控开关损毁。
【发明内容】
本发明所要解决的技术问题是提供一种解决调光可控开关在关闭时耐压问 题的 LED背光驱动电路、 背光模组及液晶显示装置。
本发明的目的是通过以下技术方案来实现的：
一种 LED背光驱动电路， 包括 LED灯条和控制模块，所述控制模块包括调 光可控开关， 所述 LED灯条跟所述调光可控开关串联连接， 所述调光可控开关 两端并联设有压敏电阻。
优选的， 所述 LED灯条的输出端还耦合有限制调光可控开关电压的嵌位电 路。 当调光可控开关关断时电压过高时候， 嵌位电路可以将调光可控开关的电 压强制拉低， 这样避免在压敏电阻损毁或反应速度不够时保护调光可控开关， 进一步解决了调光可控开关的耐压问题， 提升了驱动的可靠性。
优选的， 所述嵌位电路包括并联设置的存储电容和放电电阻， 所述存储电 容和放电电阻的一端耦合有基准电压， 另一端耦合到所述 LED灯条的输出端； 所述基准电压小于电源电压。 此为一种具体的嵌位电路， 当 LED灯条的输出端 电压（即调光可控开关的电压）超过基准电压时， 存储电容会吸收 LED灯条所 在支路的电能， 拉低调光可控开关的电压。
优选的， 所述存储电容和放电电阻通过二极管耦合到所述 LED灯条的输出 端， 二级管的阳极连接到所述 LED灯条的输出端， 其阴极跟所述存储电容和放 电电阻连接。 采用二极管可以避免电流反向， 保护 LED灯条所在支路不受其他 控制支路的干扰， 提高系统的稳定性。
优选的， 所述 LED背光驱动电路的电源输入端和接地端之间串联有第一电 阻和第二电阻， 所述控制模块的反馈端和所述二级管的阴极分别耦合到所述第 一电阻和第二电阻之间。此为一种具体的过压保护电路，通过电阻分压采集 LED 灯条输出端的电压， 当电压过高时关断调光可控开关， 进一步保护调光可控开 关。
优选的，所述 LED灯条有多串，每串 LED灯条的输出端都单独并联设有所 述压敏电阻。 这样每串 LED灯条并联单独的压敏电阻， 一串 LED灯条的压敏 电阻损毁， 不影响其他 LED灯条的正常工作。
优选的，所述 LED灯条有多串，每串 LED灯条的输出端连接到相同的压敏 电阻。 由于多条 LED灯条同时短路的情况比较少见， 因此共用压敏电阻能筒化 电路， 降低成本。
优选的， 所述 LED灯条的输出端还耦合有限制调光可控开关电压的嵌位电 路； 所述嵌位电路包括并联设置的存储电容和放电电阻， 所述存储电容和放电 电阻的一端耦合有基准电压，另一端通过二极管耦合到所述 LED灯条的输出端； 所述基准电压小于电源电压；所述二级管的阳极连接到所述 LED灯条的输出端， 其阴极跟所述存储电容和放电电阻连接； 所述 LED背光驱动电路的电源输入端 和接地端之间串联有第一电阻和第二电阻， 所述控制模块的反馈端和所述二级 管的阴极分别耦合到所述第一电阻和第二电阻之间。 此为一种优选的 LED背光 驱动电路的具体电路结构。
一种背光模组， 包括上述的一种 LED背光驱动电路。 一种液晶显示装置， 包括上述的一种背光模组。
本发明由于在调光可控开关两端并联压敏电阻， 在调光开关导通时， LED 灯条支路的电流增大， 在总电压一定的前提下， 电流增加， LED灯条承担的电 压增加， 此时， 调光可控开关承受的电压相应减小， 相应的， 并联的压敏电阻 承受的电压也很小， 压敏电阻处于高电阻状态。 当调光可控开关关断时， 支路 电流骤然减小， 此时 LED灯条承担的电压也大幅下降， 而调光可控开关两端的 电压增大， 此时并联的压敏电阻在高电压作用下电阻降低， 由 LED灯条和压敏 电阻形成的新支路的电流随之增加， 这样 LED灯条所承担的电压又会提升， 调 光可控开关两端的电压随之下降， 这样就解决了调光可控开关关闭时耐压过高 的问题。
【附图说明】
图 1是本发明实施例的原理示意图。
【具体实施方式】
一种液晶显示装置， 包括液晶显示装置和背光模组， 背光模组包括 LED背 光驱动电路，本发明的 LED背光驱动电路包括 LED灯条和控制模块，控制模块 包括调光可控开关， LED灯条跟所述调光可控开关串联连接， 所述调光可控开 关两端并联设有压敏电阻。
本发明由于在调光可控开关两端并联压敏电阻， 在调光开关导通时， LED 灯条支路的电流增大， 在总电压一定的前提下， 电流增加， LED灯条承担的电 压增加， 此时， 调光可控开关承受的电压相应减小， 相应的， 并联的压敏电阻 承受的电压也很小， 压敏电阻处于高电阻状态。 当调光可控开关关断时， 支路 电流骤然减小， 此时 LED灯条承担的电压也大幅下降， 而调光可控开关两端的 电压增大， 此时并联的压敏电阻在高电压作用下电阻降低， 由 LED灯条和压敏 电阻形成的新支路的电流随之增加， 这样 LED灯条所承担的电压又会提升， 调 光可控开关两端的电压随之下降， 这样就解决了调光可控开关关闭时耐压过高 的问题。 下面结合附图和较佳的实施例对本发明作进一步说明。
图 1所示为本发明最佳实施方式， LED背光驱动电路包括多条并联的 LED 灯条，每条灯条都串联有一个调光可控开关 Q1 (即 LED灯条的输出端连接调光 可控开关 Q1 ) , 调光可控开关 Q1集成在控制模块中 （即图中的 IC ), 由 IC输 出 PWM信号控制调光可控开关 Q1分断， 通过调整 PWM的占空比实现 LED 灯条的调光。 调光可控开关 Q1两端并联有压敏电阻 Rl。
LED灯条的输出端还耦合有限制调光可控开关电压的嵌位电路； 嵌位电路 包括并联设置的存储电容和放电电阻， 存储电容 C1和放电电阻 R2的一端耦合 有基准电压 VIN, 另一端通过二极管 D8耦合到所述 LED灯条的输出端； 二极 管 D8的阳极连接到 LED灯条的输出端，其阴极跟存储电容 C1和放电电阻连接 R2; 基准电压 VIN小于电源电压 VOUT。 嵌位电路可以将调光可控开关的电压 强制拉低， 这样避免在压敏电阻损毁或反应速度不够时保护调光可控开关。 具 体来说， 当 LED灯条的输出端电压（即调光可控开关的电压）超过基准电压时， 存储电容会吸收 LED灯条所在支路的电能， 拉低调光可控开关的电压。 采用嵌 位电路进一步解决了调光可控开关的耐压问题， 提升了驱动的可靠性。 而采用 二极管可以避免电流反向， 保护 LED灯条所在支路不受其他控制支路的干扰， 提高系统的稳定性。
LED背光驱动电路的电源输入端和接地端之间串联有第一电阻 R3和第二 电阻 R4, IC的反馈端和二级管的阴极分别耦合到第一电阻和第二电阻之间， 即 IC的反馈端通过二极管耦合到 LED灯条的输出端，可以检测调光可控开关的电 压， 一旦产生过压现象， IC本身可以采取过压保护， 将调光可控开关关断， 保 护调光可控开关， 进一步提升了可靠性。
本发明中每串 LED灯条的输出端都可以单独并联设置独立的压敏电阻。 这 样每串 LED灯条并联单独的压敏电阻， 一串 LED灯条的压敏电阻损毁， 不影 响其他 LED灯条的正常工作。不过多条 LED灯条同时短路的情况比较少见， 因 此每串 LED灯条的输出端连接到相同的压敏电阻也是可行的， 并且共用压敏电 阻能筒化电路， 降低成本。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通 技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干筒单推演或替 换， 都应当视为属于本发明的保护范围。

Claims

权利要求
1、 一种 LED背光驱动电路， 包括 LED灯条和控制模块， 所述控制模块包 括调光可控开关， 所述 LED灯条跟所述调光可控开关串联连接， 所述调光可控 开关两端并联设有压敏电阻。
2、 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述 LED灯条的 输出端还耦合有限制调光可控开关电压的嵌位电路。
3、 如权利要求 2所述的一种 LED背光驱动电路， 其中， 所述嵌位电路包 括并联设置的存储电容和放电电阻， 所述存储电容和放电电阻的一端耦合有基 准电压， 另一端耦合到所述 LED灯条的输出端； 所述基准电压小于电源电压。
4、 如权利要求 3所述的一种 LED背光驱动电路， 其中， 所述存储电容和 放电电阻通过二极管耦合到所述 LED灯条的输出端， 二级管的阳极连接到所述 LED灯条的输出端， 其阴极跟所述存储电容和放电电阻连接。
5、 如权利要求 4所述的一种 LED背光驱动电路， 其中， 所述 LED背光驱 动电路的电源输入端和接地端之间串联有第一电阻和第二电阻， 所述控制模块 的反馈端和所述二级管的阴极分别耦合到所述第一电阻和第二电阻之间。
6、 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述 LED灯条有 多串， 每串 LED灯条的输出端都单独并联设有所述压敏电阻。
7、 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述 LED灯条有 多串， 每串 LED灯条的输出端连接到相同的压敏电阻。
8、 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述 LED灯条的 输出端还耦合有限制调光可控开关电压的嵌位电路； 所述嵌位电路包括并联设 置的存储电容和放电电阻， 所述存储电容和放电电阻的一端耦合有基准电压， 另一端通过二极管耦合到所述 LED灯条的输出端；所述基准电压小于电源电压； 所述二级管的阳极连接到所述 LED灯条的输出端， 其阴极跟所述存储电容和放 电电阻连接； 所述 LED背光驱动电路的电源输入端和接地端之间串联有第一电 阻和第二电阻， 所述控制模块的反馈端和所述二级管的阴极分别耦合到所述第 一电阻和第二电阻之间。
9、 一种背光模组， 包括一种 LED背光驱动电路， 所述 LED背光驱动电路 包括 LED灯条和控制模块，所述控制模块包括调光可控开关，所述 LED灯条跟 所述调光可控开关串联连接， 所述调光可控开关两端并联设有压敏电阻。
10、 如权利要求 9所述的一种背光模组， 其中， 所述 LED灯条的输出端还 耦合有限制调光可控开关电压的嵌位电路。
11、 如权利要求 10所述的一种背光模组， 其中， 所述嵌位电路包括并联设 置的存储电容和放电电阻， 所述存储电容和放电电阻的一端耦合有基准电压， 另一端耦合到所述 LED灯条的输出端； 所述基准电压小于电源电压。
12、 如权利要求 11所述的一种背光模组， 其中， 所述存储电容和放电电阻 通过二极管耦合到所述 LED灯条的输出端，二级管的阳极连接到所述 LED灯条 的输出端， 其阴极跟所述存储电容和放电电阻连接。
13、 如权利要求 12所述的一种背光模组， 其中， 所述 LED背光驱动电路 的电源输入端和接地端之间串联有第一电阻和第二电阻， 所述控制模块的反馈 端和所述二级管的阴极分别耦合到所述第一电阻和第二电阻之间。
14、 如权利要求 9所述的一种背光模组， 其中， 所述 LED灯条有多串， 每 串 LED灯条的输出端都单独并联设有所述压敏电阻。
15、 如权利要求 9所述的一种背光模组， 其中， 所述 LED灯条有多串， 每 串 LED灯条的输出端连接到相同的压敏电阻。
16、 如权利要求 9所述的一种背光模组， 其中， 所述 LED灯条的输出端还 耦合有限制调光可控开关电压的嵌位电路； 所述嵌位电路包括并联设置的存储 电容和放电电阻， 所述存储电容和放电电阻的一端耦合有基准电压， 另一端通 过二极管耦合到所述 LED灯条的输出端； 所述基准电压小于电源电压； 所述二 级管的阳极连接到所述 LED灯条的输出端， 其阴极跟所述存储电容和放电电阻 连接； 所述 LED背光驱动电路的电源输入端和接地端之间串联有第一电阻和第 二电阻， 所述控制模块的反馈端和所述二级管的阴极分别耦合到所述第一电阻 和第二电阻之间。
17、 一种液晶显示装置， 包括如权利要求 9所述的一种背光模组。
18、 如权利要求 17所述的一种液晶显示装置， 其中， 所述 LED灯条有多 串， 每串 LED灯条的输出端都单独并联设有所述压敏电阻。
19、 如权利要求 17所述的一种液晶显示装置， 其中， 所述 LED灯条有多 串， 每串 LED灯条的输出端连接到相同的压敏电阻。
20、 如权利要求 17所述的一种液晶显示装置， 其中， 所述 LED灯条的输 出端还耦合有限制调光可控开关电压的嵌位电路； 所述嵌位电路包括并联设置 的存储电容和放电电阻， 所述存储电容和放电电阻的一端耦合有基准电压， 另 一端通过二极管耦合到所述 LED灯条的输出端； 所述基准电压小于电源电压； 所述二级管的阳极连接到所述 LED灯条的输出端， 其阴极跟所述存储电容和放 电电阻连接； 所述 LED背光驱动电路的电源输入端和接地端之间串联有第一电 阻和第二电阻， 所述控制模块的反馈端和所述二级管的阴极分别耦合到所述第 一电阻和第二电阻之间。
PCT/CN2012/078339 2012-07-02 2012-07-09 一种led背光驱动电路、背光模组及液晶显示装置 Ceased WO2014005335A1 (zh)

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