WO2013189092A1 - Led背光驱动电路、液晶显示装置及led背光驱动电路的制造方法 - Google Patents

Led背光驱动电路、液晶显示装置及led背光驱动电路的制造方法 Download PDF

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Publication number
WO2013189092A1
WO2013189092A1 PCT/CN2012/077498 CN2012077498W WO2013189092A1 WO 2013189092 A1 WO2013189092 A1 WO 2013189092A1 CN 2012077498 W CN2012077498 W CN 2012077498W WO 2013189092 A1 WO2013189092 A1 WO 2013189092A1
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Prior art keywords
led light
series
led
coupled
digital potentiometer
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English (en)
French (fr)
Inventor
张先明
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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 US13/577,469 priority Critical patent/US8907593B2/en
Publication of WO2013189092A1 publication Critical patent/WO2013189092A1/zh
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    • 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
    • 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]
    • H05B45/40—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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing

Definitions

  • LED backlight driving circuit liquid crystal display device and LED backlight driving circuit manufacturing method
  • the present invention relates to the field of liquid crystal display, and more particularly to an LED backlight driving circuit, a liquid crystal display device, and a manufacturing method.
  • the liquid crystal display device includes a liquid crystal panel and a backlight module.
  • the backlight module with LED if multiple LED strips are used, as shown in Figure 1 and Figure 2, the LED strips are connected in parallel, and each LED strip is connected in series to the same converter.
  • a control chip is provided, and the control chip is coupled with the output end of each LED strip. Since the voltage of each LED strip is different, that is, V F1 , V F2 , V F3 , and V F4 are not equal.
  • V LED of the branch where the entire LED strip is located is equal, V F1 , V F2 , V F3 , V F4 are not equal, causing the voltages Vui D1 , V LED2 , V loaded on the converter control chip LED3 , V LED4 voltage is also different, there is a voltage difference will generate current, resulting in the temperature of the control chip used in the backlight-driven converter is increased, in order to solve the temperature problem need to add thermal pad (Thermal pad), or copper This in turn will increase costs.
  • thermal pad Thermal pad
  • the technical problem to be solved by the present invention is to provide an LED backlight driving circuit, a liquid crystal display device and a manufacturing method which are low in cost and can reduce the temperature of the control chip in the backlight driving converter.
  • An LED backlight driving circuit includes at least two LED strips arranged in parallel, the LED strip output end is coupled with a converter module, and the converter module is provided with a pass-through for equalizing a voltage difference between the LED strips A digital potentiometer that adjusts the value of the signal.
  • the current conversion module comprises a control chip, one end of each digital potentiometer is coupled in series to an output end of one LED light bar, and the other end is coupled in series to the control chip.
  • This is the circuit structure of a specific converter module.
  • the current conversion module further includes an isolation switch, and the digital potentiometer is coupled to the control chip in series through an isolation switch. The isolation switch is added. When the LED light bar is short-circuited, the isolation switch is disconnected to prevent the branch voltage from being fully loaded into the control chip and damaging the control chip.
  • the current conversion module further includes a connector, and the digital potentiometer is coupled in series to the output end of the LED light bar through a connector.
  • the connector is convenient for the maintenance of the converter module, and the converter module can be separately separated from the drive circuit by disconnecting the connector during maintenance.
  • the remaining LED strips are connected in series with the digital potentiometer.
  • the LED light bar with the maximum differential pressure is used as the reference voltage, on the one hand, the resistance of one LED light bar can be saved.
  • the reference voltage is small, other LED light bars can be connected in series with a small resistance value, thereby reducing The consumption of electrical energy in the resistor helps to reduce energy consumption.
  • a liquid crystal display device comprising the above-described LED backlight driving circuit.
  • a method for manufacturing an LED backlight driving circuit comprising the steps A: connecting a converter module in series at an output end of the LED strip, and setting a value for adjusting a resistance value by an electric signal for equalizing a voltage difference between the LED strips in the converter module Potentiometer.
  • the step A includes:
  • A1 Calculate the differential pressure across each LED strip, taking the maximum differential voltage as the reference voltage;
  • A2 In addition to the LED strips that are consistent with the reference voltage, the branches of the remaining LED strips are connected in series with the digital potentiometer.
  • the resistance of each digital potentiometer is dynamically adjusted by the electrical signal, so that the total voltage of the LED strip and the digital potentiometer The difference is equal to the reference voltage. Taking the LED strip with the largest differential pressure as the reference voltage, on the one hand, the resistance of one LED strip can be saved. On the other hand, since the reference voltage is small, the resistance of other LED strips in series with a small resistance can be reduced. The consumption of electrical energy in the resistor helps to reduce energy consumption.
  • the current conversion module includes a control chip, and the current conversion module includes a control chip, wherein one end of each digital potentiometer is coupled in series to an output end of one LED light bar, and the other end is coupled in series to The control chip.
  • This is the circuit structure of a specific converter module.
  • the current conversion module further includes an isolating switch and a connector, and one end of the digital potentiometer is coupled in series to the control chip through an isolating switch;
  • the output of the LED strip is coupled in series via a connector.
  • the isolation switch is added. When the LED light bar is short-circuited, the isolation switch is disconnected, so that the branch voltage is completely loaded to the control chip, and the control chip is damaged; the connector is convenient for the maintenance of the converter module, and the connector is disconnected during maintenance.
  • the converter module can be separately separated from the drive circuit.
  • the invention is provided with a digital potentiometer for adjusting the resistance value by an electric signal in a converter module connected in series with the LED light bar, so that the voltage of each LED light bar is consistent with the voltage of the digital potentiometer connected in series, so that the coupling
  • the voltage of each pin of the control chip in the drive converter can be kept consistent, there is basically no voltage difference between the pins, no additional current is generated in the control chip, the power consumption of the control chip is reduced, and the control chip is controlled. The amount of heat is reduced, which lowers the temperature of the control chip.
  • the resistance value will change.
  • the digital potentiometer the resistance value can be automatically adjusted by digital command at any time during use. Under the temperature condition, the sum of the voltage differences of each LED light bar and its serial digital potentiometer can be consistent, which can reduce the heat generation of the control chip more effectively.
  • 1 is a conventional LED backlight driving circuit
  • Figure 2 is an LED backlight driving circuit with an isolating switch
  • FIG 3 is an LED backlight driving circuit according to an embodiment of the present invention.
  • 4 is an LED backlight driving circuit with an isolating switch according to an embodiment of the present invention.
  • a liquid crystal display device includes a backlight module, and an LED backlight driving circuit is disposed in the backlight module, wherein the LED backlight driving circuit includes at least two LED light bars disposed in parallel, and the LED light bar output end is coupled with a variable current
  • the converter module is provided with a digital potentiometer for adjusting the resistance value by an electric signal for equalizing the voltage difference between the LED strips.
  • the invention is provided with adjusting the resistance value by an electric signal in a converter module connected in series with the LED light bar.
  • the digital potentiometer keeps the voltage of each LED strip and the voltage of the digital potentiometer connected in series with it, so that the voltage of each pin of the control chip coupled to the driving converter can be kept consistent, and the pins are basically not between There is a voltage difference, no additional current is generated in the control chip, the power consumption of the control chip is reduced, and the heat generated by the control chip is reduced, thereby reducing the temperature of the control chip.
  • the resistance value will change. With the digital potentiometer, the resistance value can be automatically adjusted by digital command at any time during use.
  • each digital potentiometer of the converter module is connected to an LED strip, which is DVRi ⁇ DVR 4 , so that the resistance of each branch of the LED strip can be Tune.
  • the other LED strips are connected in series with a digital potentiometer that adjusts the resistance by an electrical signal. Taking the LED strip with the largest differential pressure as the reference voltage, on the one hand, the resistance of one LED strip can be saved. On the other hand, since the reference voltage is small, the resistance of other LED strips in series with a small resistance can be reduced. The consumption of electrical energy in the resistor helps to reduce energy consumption.
  • the current conversion module further includes an isolating switch Q1 and a connector.
  • the digital potentiometer DVR terminal is coupled in series to the control chip through the isolating switch Q1, and the other end is coupled in series through the connector.
  • the isolation switch is added. When the LED light bar is short-circuited, the isolation switch is disconnected, so that the branch voltage is completely loaded to the control chip, and the control chip is damaged; the connector is convenient for the maintenance of the converter module, and the connector is disconnected during maintenance.
  • the converter module can be separately separated from the drive circuit.
  • V FX V FX , in the case of the total voltage V LED - the sum of the voltages of the LED strip and the digital resistor is the same, then the voltage difference between the control chip pins of the converter module is naturally small, that is, V The LEDX remains consistent, closest to the voltage required by the control chip, thereby reducing the amount of heat generated by the control chip.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Liquid Crystal (AREA)

Description

LED背光驱动电路、 液晶显示装置及 LED背光驱动电路的制造方法
【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、 液 晶显示装置及一种制造方法。
【背景技术】
液晶显示装置包括液晶面板和背光模组。 在釆用 LED 的背光模组中， 如 果使用多条 LED灯条，如图 1、 2所示， LED灯条之间釆用并联设置，每条 LED 灯条都串联到同一个的变流器中，变流器中设有控制芯片，控制芯片跟每条 LED 灯条的输出端耦合， 由于每条 LED灯条的电压不一样， 即 VF1、 VF2、 VF3、 VF4 不相等，而整个 LED灯条所在支路的电压 VLED的电压是相等的， VF1、 VF2、 VF3、 VF4不相等， 造成加载到变流器控制芯片上的电压 VuiD1、 VLED2, VLED3, VLED4 的电压也不一样， 有压差就会产生电流， 致使背光驱动变流器中使用的控制芯 片温度升高， 为解决温度问题需要加导热垫片 （Thermal pad ), 或者棵铜， 这又 会造成成本的增加。
【发明内容】
本发明所要解决的技术问题是提供一种低成本、 能降低背光驱动变换器中 控制芯片温度的 LED背光驱动电路、 液晶显示装置及一种制造方法。
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， 包括至少两条并联设置的 LED灯条， 所述 LED 灯条输出端耦合有变流模块， 所述变流模块设有用于均衡 LED灯条之间压差的 通过电信号调整阻值的数字电位器。
优选的， 所述变流模块包括控制芯片， 所述每个数字电位器一端串联耦合 到一条 LED灯条的输出端， 另一端串联耦合到所述控制芯片。 此为一种具体的 变流模块的电路结构。 优选的， 所述变流模块还包括隔离开关， 所述数字电位器通过隔离开关串 联耦合到所述控制芯片。 增加隔离开关， 当 LED灯条短路时， 隔离开关断开， 避免支路电压全部加载到控制芯片， 损坏控制芯片。
优选的， 所述变流模块还包括连接器， 所述数字电位器通过连接器串联耦 合到所述 LED灯条的输出端。 釆用连接器方便变流模块的检修， 检修时通过断 开连接器连接就能单独将变流模块从驱动电路中分离出来。
优选的，除了压差最大的一条 LED灯条以外，其余 LED灯条都串联有所述 数字电位器。 以最大压差的 LED灯条为基准电压，一方面可以节省一条 LED灯 条的电阻， 另一方面， 由于此基准电压较小， 其它 LED灯条串联的阻值较小的 电阻即可， 减少电能在电阻上的消耗， 有利于降低能耗。
一种液晶显示装置， 包括上述的一种 LED背光驱动电路。
一种 LED背光驱动电路的制造方法， 包括步骤 A: 在 LED灯条输出端串联 变流模块， 在变流模块内设置用于均衡 LED灯条之间压差的通过电信号调整阻 值的数字电位器。
优选的， 所述步骤 A包括：
A1 : 计算每条 LED灯条两端的压差， 取最大的压差作为基准电压；
A2: 除了跟基准电压一致的 LED灯条， 其余 LED灯条所在支路都串联数 字电位器， 通过电信号动态调节每个数字电位器的阻值， 使得 LED灯条与数字 电位器的总压差等于基准电压。 以最大压差的 LED灯条为基准电压， 一方面可 以节省一条 LED灯条的电阻， 另一方面， 由于此基准电压较小， 其它 LED灯条 串联的阻值较小的电阻即可， 减少电能在电阻上的消耗， 有利于降低能耗。
优选的， 所述步骤 A中： 所述变流模块包括控制芯片， 所述变流模块包括 控制芯片， 将每个数字电位器一端串联耦合到一条 LED灯条的输出端， 另一端 串联耦合到所述控制芯片。 此为一种具体的变流模块的电路结构。
优选的， 所述步骤 A中： 所述步骤 A中： 所述变流模块还包括隔离开关和 连接器， 将数字电位器的一端通过隔离开关串联耦合到所述控制芯片； 另一端 通过连接器串联耦合到所述 LED灯条的输出端。增加隔离开关， 当 LED灯条短 路时， 隔离开关断开， 避免支路电压全部加载到控制芯片， 损坏控制芯片； 釆 用连接器方便变流模块的检修， 检修时通过断开连接器连接就能单独将变流模 块从驱动电路中分离出来。
本发明由于在跟 LED灯条串联的变流模块内设置了通过电信号调整阻值的 数字电位器， 使得每条 LED灯条电压与其串接的数字电位器的电压之和保持一 致， 这样耦合到驱动变换器中的控制芯片各引脚的电压才能保持一致， 引脚之 间基本不存在压差， 控制芯片内也就不会产生额外的电流， 降低了控制芯片的 功耗，控制芯片的发热量随之减少，从而降低控制芯片的温度。 另外， 随着 LED 灯条在使用过程中随着温度的升高， 阻值会产生变化， 而釆用数字电位器， 可 以在使用过程中随时以数字指令的方式自动调整阻值， 使得在各种温度条件下 , 每条 LED灯条及其串接的数字电位器的压差之和都能保持一致， 可以更有效地 降低控制芯片的发热量。
【附图说明】
图 1是现有的一种 LED背光驱动电路；
图 2是带隔离开关的 LED背光驱动电路；
图 3是本发明实施例的一种 LED背光驱动电路；
图 4是本发明实施例的一种带隔离开关的 LED背光驱动电路。
【具体实施方式】
一种液晶显示装置， 包括背光模组， 背光模组中设有 LED背光驱动电路， 所述 LED背光驱动电路包括至少两条并联设置的 LED灯条， 所述 LED灯条输 出端耦合有变流模块， 所述变流模块设有用于均衡 LED灯条之间压差的通过电 信号调整阻值的数字电位器。
本发明由于在跟 LED灯条串联的变流模块内设置了通过电信号调整阻值的 数字电位器， 使得每条 LED灯条电压与其串接的数字电位器的电压之和保持一 致， 这样耦合到驱动变换器中的控制芯片各引脚的电压才能保持一致， 引脚之 间基本不存在压差， 控制芯片内也就不会产生额外的电流， 降低了控制芯片的 功耗，控制芯片的发热量随之减少，从而降低控制芯片的温度。 另外， 随着 LED 灯条在使用过程中随着温度的升高， 阻值会产生变化， 而釆用数字电位器， 可 以在使用过程中随时以数字指令的方式自动调整阻值， 使得在各种温度条件下 , 每条 LED灯条及其串接的数字电位器的压差之和都能保持一致， 可以更有效地 降低控制芯片的发热量。 下面结合附图和较佳的实施例对本发明的 LED背光驱 动电路作进一步说明。
如图 3所示， 图中有 4条 LED灯条， 变流模块的每个数字电位器连接一条 LED灯条， 分别为 DVRi ~ DVR4 , 这样每条 LED灯条所在支路的电阻都可调。 更进一步的， 除了压差最大的一条 LED灯条以外，其余 LED灯条都串联有通过 电信号调整阻值的数字电位器。 以最大压差的 LED灯条为基准电压， 一方面可 以节省一条 LED灯条的电阻， 另一方面， 由于此基准电压较小， 其它 LED灯条 串联的阻值较小的电阻即可， 减少电能在电阻上的消耗， 有利于降低能耗。
进一步的， 如图 4所示， 所述变流模块还包括隔离开关 Q1和连接器， 所数 字电位器 DVR—端通过隔离开关 Q1 串联耦合到所述控制芯片， 另一端通过连 接器串联耦合到 LED灯条的输出端。 增加隔离开关， 当 LED灯条短路时， 隔离 开关断开， 避免支路电压全部加载到控制芯片， 损坏控制芯片； 釆用连接器方 便变流模块的检修， 检修时通过断开连接器连接就能单独将变流模块从驱动电 路中分离出来。
本发明还公开了一种 LED 背光驱动电路的制造方法， 我们可以在每一条 LED灯条制成好之后，量测在需要的电流 I下每一条 LED灯条的电压 VF1、 VF2、 VF3、 VF4……这样可以测出电压最大的一条 LED灯条， 其电压值设为 VFX,那么 我们可以在剩下的每一条 LED灯条上串联数字电位器， 通过电信号动态调节数 字电位器的电阻， 使得 VF1+
Figure imgf000006_0001
VF2+ DVR2= VF3+ DVR3= VF4+ DVR4=…… =VFX, 在总的电压 VLED—定的情况下， LED灯条和数位电阻的电压总和保持一 致，那么变流模块的控制芯片引脚之间的压差自然也就艮小，即 VLEDX保持一致， 最接近于控制芯片所需要的电压值， 从而减少控制芯片的发热量。
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， 还可以做出若干简单推演或替 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，包括至少两条并联设置的 LED灯条，所述 LED 灯条输出端耦合有变流模块， 所述变流模块设有用于均衡 LED灯条之间压差的 通过电信号调整阻值的数字电位器。
2、 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述变流模块包 括控制芯片， 所述每个数字电位器一端串联耦合到一条 LED灯条的输出端， 另 一端串联耦合到所述控制芯片。
3、 如权利要求 2所述的一种 LED背光驱动电路， 其中， 所述变流模块还 包括隔离开关， 所述数字电位器通过隔离开关串联耦合到所述控制芯片。
4、 如权利要求 2所述的一种 LED背光驱动电路， 其中， 所述变流模块还 包括连接器， 所述数字电位器通过连接器串联耦合到所述 LED灯条的输出端。
5、 如权利要求 2所述的一种 LED背光驱动电路， 其中， 除了压差最大的 一条 LED灯条以外， 其余 LED灯条都串联有所述数字电位器。
6、 一种液晶显示装置， 包括一种 LED背光驱动电路， 所述 LED背光驱动 电路包括至少两条并联设置的 LED灯条，所述 LED灯条输出端耦合有变流模块， 所述变流模块设有用于均衡 LED灯条之间压差的通过电信号调整阻值的数字电 位器。
7、 如权利要求 6所述的一种液晶显示装置， 其中， 所述变流模块包括控制 芯片， 所述每个数字电位器一端串联耦合到一条 LED灯条的输出端， 另一端串 联耦合到所述控制芯片。
8、 如权利要求 7所述的一种液晶显示装置， 其中， 所述变流模块还包括隔 离开关， 所述数字电位器通过隔离开关串联耦合到所述控制芯片。
9、 如权利要求 7所述的一种液晶显示装置， 其中， 所述变流模块还包括连 接器， 所述数字电位器通过连接器串联耦合到所述 LED灯条的输出端。
10、 如权利要求 7 所述的一种液晶显示装置， 其中， 除了压差最大的一条 LED灯条以外， 其余 LED灯条都串联有所述数字电位器。
11、 一种 LED背光驱动电路的制造方法， 包括步骤 A: 在 LED灯条输出端 串联变流模块， 在变流模块内设置用于均衡 LED灯条之间压差的通过电信号调 整阻值的数字电位器。
12、如权利要求 11所述的一种 LED背光驱动电路的制造方法， 其中， 所述 步骤 A包括：
A1 : 计算每条 LED灯条两端的压差， 取最大的压差作为基准电压；
A2: 除了跟基准电压一致的 LED灯条， 其余 LED灯条所在支路都串联数 字电位器， 通过电信号动态调节每个数字电位器的阻值， 使得 LED灯条与数字 电位器的总压差等于基准电压。
13、如权利要求 11所述的一种 LED背光驱动电路的制造方法， 其中， 所述 步骤 A中： 所述变流模块包括控制芯片， 将每个数字电位器一端串联耦合到一 条 LED灯条的输出端， 另一端串联耦合到所述控制芯片。
14、 如权利要求 13所述的一种 LED背光驱动电路的制造方法， 其中， 所 述步骤 A中： 所述变流模块还包括隔离开关和连接器， 将数字电位器的一端通 过隔离开关串联耦合到所述控制芯片； 另一端通过连接器串联耦合到所述 LED 灯条的输出端。
PCT/CN2012/077498 2012-06-21 2012-06-26 Led背光驱动电路、液晶显示装置及led背光驱动电路的制造方法 Ceased WO2013189092A1 (zh)

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