WO2013170490A1 - 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
WO2013170490A1
WO2013170490A1 PCT/CN2012/075788 CN2012075788W WO2013170490A1 WO 2013170490 A1 WO2013170490 A1 WO 2013170490A1 CN 2012075788 W CN2012075788 W CN 2012075788W WO 2013170490 A1 WO2013170490 A1 WO 2013170490A1
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Prior art keywords
module
led
voltage
controllable switch
led light
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PCT/CN2012/075788
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English (en)
French (fr)
Inventor
高新明
杨翔
黎飞
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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 US13/518,429 priority Critical patent/US8994639B2/en
Publication of WO2013170490A1 publication Critical patent/WO2013170490A1/zh

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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]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • 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
    • 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
    • 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, and more particularly to an LED backlight driving circuit, a backlight module, and a liquid crystal display device.
  • the liquid crystal display device includes a liquid crystal panel and a backlight module.
  • the existing LED is used as a backlight module, and a boost (Boost) circuit is often used in the backlight driving circuit.
  • Boost boost
  • L1 stores energy when Q1 is on, and L1 reverses energy when Q1 is turned off, so that the output voltage is higher than the input voltage, and then the constant current module is used to make the current flowing through the LED constant: control Q2
  • the impedance makes the voltage on R1 equal to the reference voltage Vref to achieve a constant current.
  • the relationship between input and output is:
  • Vo/Vin l/(l-D)
  • D is the ratio of the on-time to the period of Q1.
  • Vin After the previous DC/DC conversion, Vin passes the Boost transform, which is inefficient.
  • 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 improve conversion efficiency and low cost.
  • An LED backlight driving circuit includes an LED light string.
  • the input end of the LED light string is directly connected to the power input end, and the output end of the LED light string is coupled with a buck module.
  • the step-down module comprises a stored energy step-down controllable switch, a diode, one end of the step-down controllable switch is connected to the power input end, and the other end is connected to the positive pole of the diode, and the negative pole of the diode is coupled to The output end of the LED light string; a storage capacitor is connected in series between the negative pole of the diode and the ground end of the power input end; and an energy storage inductor is connected in series between the positive pole of the diode and the ground end of the power input end.
  • a specific buck module is the structure of a specific buck module.
  • a filter power is connected in series between the power input end and the ground end of the LED backlight driving circuit. Rong. Filter capacitors improve the quality of the input power.
  • the LED light string has at least two, and each LED light string is connected in parallel.
  • This is a circuit display using multiple LED strings, suitable for large-screen liquid crystal display devices.
  • the LED light string and the step-down module are also connected in series with a dimmable controllable switch for adjusting the effective current of the branch of the LED light bar, thereby adjusting the brightness of the LED.
  • control end of the dimming controllable switch is connected to the constant current module.
  • a voltage dividing resistor is further connected in series between the dimming controllable switch and the step-down module.
  • the voltage dividing resistor can limit the short-circuit current when the LED string is short-circuited.
  • the voltage difference across the resistor can also provide feedback to the constant current module that controls the dimming controllable switch as the feedback voltage for constant current control.
  • the constant current module includes a comparator, one input terminal is connected to a reference voltage, the other input end is coupled between the dimming controllable switch and the voltage dividing resistor, and the output end is coupled to the adjustable The control end of the light controllable switch.
  • a comparator one input terminal is connected to a reference voltage
  • the other input end is coupled between the dimming controllable switch and the voltage dividing resistor
  • the output end is coupled to the adjustable The control end of the light controllable switch.
  • a backlight module includes the above LED backlight driving circuit.
  • a liquid crystal display device includes the above backlight module.
  • the invention has a step-down module connected in series at the output end of the LED light string, so that the LED light string is connected between the input voltage and the output voltage, and a part of the LED is directly powered by the input voltage, and does not need to undergo a first-order conversion, which requires a step-down module.
  • the energy provided is reduced, the conversion efficiency is improved, and the energy efficiency is improved.
  • the voltage reduction requirements of the step-down module are reduced, the device specifications are lowered, and the cost is reduced.
  • FIG. 1 is a schematic diagram of a conventional backlight driving circuit
  • FIG. 2 is a schematic diagram of a circuit principle of an embodiment of the present invention.
  • a liquid crystal display device includes a liquid crystal panel and a backlight module, and the backlight module includes an LED back Optical drive circuit.
  • the LED backlight driving circuit of the present invention comprises an LED light string, and the output end of the LED is coupled with a buck module.
  • the buck module includes a stored energy buck controllable switch Ql, a diode D1, one end of the buck controllable switch Q1 is connected to the power input terminal Vin, the other end is connected to the positive pole of the diode, and the negative pole of the diode is coupled to the output end of the LED string;
  • a storage capacitor C1 is connected in series between the cathode of the diode and the ground of the power input terminal;
  • a storage inductor LI is connected in series between the anode of the diode and the ground of the power input; the power input terminal of the LED backlight driving circuit is connected in series with the ground.
  • a dimming controllable switch Q2 and a voltage dividing resistor R1 are connected in series between the negative pole of the diode D1 and the output end of the LED light string, and the constant current module U1A is connected to the control end of the dimming controllable switch Q2, and the constant current module includes a comparator, comparing One input terminal is connected to a reference voltage Vref, the other input terminal is coupled between the dimming controllable switch Q2 and the voltage dividing resistor R1, and the output end is coupled to the control end of the dimming controllable switch Q2.
  • the dimming controllable switch Q2 is controlled to adjust the effective current of the branch, so that the voltage on the voltage dividing resistor R1 is equal to the reference voltage Vref to achieve constant current.
  • the invention can be applied to the case of a single LED string, and can also be applied to a plurality of LED strings. At this time, each LED string is connected in parallel, and the output end thereof is uniformly coupled to the step-down module.
  • the invention has a step-down module connected in series at the output end of the LED light string, so that the LED light string is connected between the input voltage and the output voltage, and a part of the LED is directly powered by the input voltage, and does not need to undergo a first-order conversion, which requires a step-down module.
  • the energy provided is reduced, the conversion efficiency is improved, and the energy efficiency is improved.
  • the voltage reduction requirements of the step-down module are reduced, the device specifications are lowered, and the cost is reduced.

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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LED背光驱动电路、背光模组及液晶显示装置，其中，LED背光驱动电路包括LED灯串，LED灯串的输入端跟电源输入端直接连接，LED灯串的输出端耦合有降压模块。背光模组包括LED背光驱动电路。液晶显示装置包括背光模组。本发明将LED灯串连接在输入电压和输出电压中间，一部分LED直接由输入电压供电，需要由降压模块提供的能量随之减少，提高了能效，而且降压模块对耐压的要求降低，有利于降低成本。

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】
液晶显示装置包括液晶面板和背光模组， 现有采用 LED作为背光模组在 背光驱动电路中常采用升压（Boost ) 电路。 如图 1所示， 在 Q1导通时 L1存储 能量， Q1 关断时 L1反向释放能量， 使输出电压高于输入电压， 然后再利用恒 流模块使流过 LED的电流恒定：控制 Q2的阻抗使 R1上的电压与基准电压 Vref 相等来实现恒流。 输入与输出的关系为：
Vo/Vin=l/(l-D), D为 Q1的导通时间与周期的比值。
Vin经过前段 DC/DC变换之后， 再经过 Boost变换， 效率低。
【发明内容】
本发明所要解决的技术问题是提供一种提升转换效率、 低成本的 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灯串， 所述 LED灯串的输入端跟所述 电源输入端直接连接， 所述 LED灯串的输出端耦合有降压模块。
优选的， 所述降压模块包括储能降压可控开关、 二极管， 所述降压可控开 关的一端连接电源输入端， 另一端连接到所述二极管的正极， 所述二极管的负 极耦合至所述 LED灯串的输出端； 所述二极管的负极与电源输入端的接地端之 间串联有储能电容； 所述二极管的正极与电源输入端的接地端之间串联有储能 电感。 此为一种具体的降压模块的结构。
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滤波电 容。 滤波电容可以提高输入电能的品质。
优选的， 所述 LED灯串至少有两条， 每条 LED灯串之间并联连接。 此为采 用多条 LED灯串的电路显示， 适用于大屏幕的液晶显示装置。
优选的， 所述 LED灯串跟降压模块之间还串接有调光可控开关， 用于调节 LED灯条所在支路的有效电流， 从而调整 LED亮度。
优选的， 所述调光可控开关的控制端连接有恒流模块。
优选的， 所述调光可控开关跟降压模块之间还串接有分压电阻。 分压电阻 一方面在 LED灯串短路时可以限制短路电流， 另一方面电阻两端的压差也可以 提供反馈给控制调光可控开关的恒流模块， 作为恒流控制的反馈电压。
优选的， 所述恒流模块包括比较器， 所述比较器一个输入端连接一基准电 压， 另一输入端耦合到调光可控开关和分压电阻之间， 其输出端耦合到所述调 光可控开关的控制端。 此为一种具体的恒流控制电路。
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 LED灯串输出端串联降压模块，这样将 LED灯串连接在输入 电压和输出电压中间， 一部分 LED直接由输入电压供电， 而不需要经过一级变 换， 这样需要由降压模块提供的能量随之减少， 提升了转换效率， 提高能效， 降压模块对耐压的要求降低， 降低了器件规格， 有利于降低成本。
【附图说明】
图 1是现有的一种背光驱动电路示意图；
图 2是本发明实施例的电路原理示意图。
【具体实施方式】
下面结合附图和较佳的实施例对本发明作进一步说明。
一种液晶显示装置， 包括液晶面板和背光模组， 背光模组包括一种 LED背 光驱动电路。
如图 2所示， 本发明的 LED背光驱动电路包括 LED灯串， LED的输出端 耦合有降压模块。
降压模块包括储能降压可控开关 Ql、 二极管 D1 , 降压可控开关 Q1的一端 连接电源输入端 Vin, 另一端连接到二极管的正极， 二极管的负极耦合至 LED 灯串的输出端； 二极管的负极与电源输入端的接地端之间串联有储能电容 C1； 二极管的正极与电源输入端的接地端之间串联有储能电感 LI ; LED背光驱动电 路的电源输入端和接地端之间串联有滤波电容 C2。
二极管 D1的负极跟 LED灯串的输出端之间串联有调光可控开关 Q2和分压 电阻 R1 , 调光可控开关 Q2的控制端连接有恒流模块 U1A, 恒流模块包括比较 器， 比较器一个输入端连接一基准电压 Vref, 另一输入端耦合到调光可控开关 Q2和分压电阻 R1之间， 其输出端耦合到调光可控开关 Q2的控制端。
在降压可控开关 Q1导通时， 给储能电感 L1存储能量。 此时二极管 D1截 止， 储能电感 L1上端电压高于下端电压。
当降压可控开关 Q1关断时， 储能电感 L1电压反向向， 上端电压低于下端 电压。 L1释放能量， D1导通， 拉低 LED灯串输出端的电压， 由于 LED输出端 连接到电源输出端， 其电压恒定不变， 因此， LED灯串输出端的电压降低以后， 拉大了 LED灯串两端的压差， 可以驱动 LED灯串正常发光。
恒流控制方面， 控制调光可控开关 Q2, 调节支路的有效电流， 使分压电阻 R1上的电压与与基准电压 Vref相等来实现恒流。
本发明可以应用于单条 LED灯串的场合，也可以应用在多条 LED灯串的场 合， 此时每条 LED灯串之间并联连接， 其输出端统一耦合到所述降压模块。
本发明由于在 LED灯串输出端串联降压模块，这样将 LED灯串连接在输入 电压和输出电压中间， 一部分 LED直接由输入电压供电， 而不需要经过一级变 换， 这样需要由降压模块提供的能量随之减少， 提升了转换效率， 提高能效， 降压模块对耐压的要求降低， 降低了器件规格， 有利于降低成本。 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灯串， 所述 LED灯串的输入端跟所 述电源输入端直接连接， 所述 LED灯串的输出端耦合有降压模块。
2、 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述降压模块包 括储能降压可控开关、 二极管， 所述降压可控开关的一端连接电源输入端， 另 一端连接到所述二极管的正极， 所述二极管的负极耦合至所述 LED灯串的输出 端； 所述二极管的负极与电源输入端的接地端之间串联有储能电容； 所述二极 管的正极与电源输入端的接地端之间串联有储能电感。
3、 如权利要求 1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滤波电容。
4、 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述 LED灯串至 少有两条， 每条 LED灯串之间并联连接。
5、 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述 LED灯串跟 降压模块之间还串接有调光可控开关。
6、 如权利要求 5所述的一种 LED背光驱动电路， 其中， 所述调光可控开 关的控制端连接有恒流模块。
7、 如权利要求 6所述的一种 LED背光驱动电路， 其中， 所述调光可控开 关跟降压模块之间还串接有分压电阻。
8、 如权利要求 7所述的一种 LED背光驱动电路， 其中， 所述恒流模块包 括比较器， 所述比较器一个输入端连接一基准电压， 另一输入端耦合到调光可 控开关和分压电阻之间， 其输出端耦合到所述调光可控开关的控制端。
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灯串，所述 LED灯串的输入端跟所述电源输入端直接连接，所述 LED 灯串的输出端耦合有降压模块。
10、 如权利要求 9所述的一种背光模组， 其中， 所述降压模块包括储能降 压可控开关、 二极管， 所述降压可控开关的一端连接电源输入端， 另一端连接 到所述二极管的正极， 所述二极管的负极耦合至所述 LED灯串的输出端； 所述 二极管的负极与电源输入端的接地端之间串联有储能电容； 所述二极管的正极 与电源输入端的接地端之间串联有储能电感。
11、 如权利要求 9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滤波电容。
12、如权利要求 9所述的一种背光模组， 其中， 所述 LED灯串至少有两条， 每条 LED灯串之间并联连接。
13、 如权利要求 9所述的一种背光模组， 其中， 所述 LED灯串跟降压模块 之间还串接有调光可控开关。
14、 如权利要求 13所述的一种背光模组， 其中， 所述调光可控开关的控制 端连接有恒流模块。
15、 如权利要求 14所述的一种背光模组， 其中， 所述调光可控开关跟降压 模块之间还串接有分压电阻。
16、如权利要求 15所述的一种背光模组， 其中， 所述恒流模块包括比较器， 所述比较器一个输入端连接一基准电压， 另一输入端耦合到调光可控开关和分 压电阻之间， 其输出端耦合到所述调光可控开关的控制端。
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。
PCT/CN2012/075788 2012-05-16 2012-05-21 一种led背光驱动电路、背光模组及液晶显示装置 WO2013170490A1 (zh)

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