WO2013189093A1 - 一种led背光驱动电路和液晶显示装置、制造方法 - Google Patents

一种led背光驱动电路和液晶显示装置、制造方法 Download PDF

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Publication number
WO2013189093A1
WO2013189093A1 PCT/CN2012/077500 CN2012077500W WO2013189093A1 WO 2013189093 A1 WO2013189093 A1 WO 2013189093A1 CN 2012077500 W CN2012077500 W CN 2012077500W WO 2013189093 A1 WO2013189093 A1 WO 2013189093A1
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Prior art keywords
led
led light
series
voltage
light bar
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PCT/CN2012/077500
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English (en)
French (fr)
Inventor
张先明
张裕桦
陈明暐
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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 US13/574,448 priority Critical patent/US20130342118A1/en
Publication of WO2013189093A1 publication Critical patent/WO2013189093A1/zh
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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
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • 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

  • 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 using LED if multiple LED strips are used, as shown in Figure 1 and Figure 2, the LED strips are arranged in parallel, and each LED strip is connected in series to the same converter.
  • the control IC is provided in the device, and the IC is coupled to the output end of each LED strip through a connector, and an isolating switch Q1 is connected in series between the IC and the connector.
  • 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 capable of reducing the temperature of an IC in a backlight driving converter.
  • An LED backlight driving circuit comprises at least two LED strips arranged in parallel, and the at least one LED strip is connected in series with a voltage dividing resistor for equalizing a voltage difference between the LED strips.
  • the voltage dividing resistor is a fixed resistor with a fixed resistance.
  • the low cost of using fixed resistors helps to reduce raw material costs.
  • the remaining LED strips are connected in series with the fixed resistor.
  • the LED strip with the largest differential pressure as the reference voltage, one LED strip can be saved on the one hand.
  • this reference voltage is small, other LED strips can be connected in series with a smaller resistance, which reduces the consumption of electrical energy in the resistor, which is beneficial to reduce energy consumption.
  • the fixed resistor is connected in series between the LED light bar and the isolating switch. Increase the isolation switch. When the LED strip is short-circuited, the isolation switch is disconnected to prevent the branch voltage from being fully loaded into the IC and damaging the IC.
  • a liquid crystal display device includes an LED backlight driving circuit, the LED backlight driving circuit includes at least two LED light bars arranged in parallel, and the at least one LED light bar is connected in series for equalizing a voltage difference between the LED light bars.
  • a voltage dividing resistor wherein the voltage dividing resistor is a fixed resistor with a fixed resistance.
  • the remaining LED strips are connected in series with the fixed resistor.
  • 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.
  • the fixed resistor is connected in series between the LED light bar and the isolating switch. Increase the isolation switch. When the LED strip is short-circuited, the isolation switch is disconnected to prevent the branch voltage from being fully loaded into the IC and damaging the IC.
  • a method for manufacturing an LED backlight driving circuit comprising the steps A: connecting a voltage dividing resistor for equalizing a voltage difference between the LED strips in a branch of the LED strip, so that the voltage difference between each LED strip is consistent .
  • 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 remaining LED strips are connected in series with a fixed resistor with a fixed value as a voltage divider resistor, so that the sum of the voltage difference between the LED strip and the fixed resistor is equal to the reference voltage.
  • 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. On the other hand, since 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.
  • an isolation switch is connected in series in each LED light bar, and the voltage dividing resistor is connected in series between the LED light bar and the isolating switch.
  • Increase the isolation switch when the LED light bar is shorted, Disconnect from the switch to prevent the branch voltage from being fully loaded into the IC and damaging the IC.
  • the invention has a voltage dividing resistor for equalizing the voltage difference between the LED strips in series with the LED strip, so that the voltage divider of different resistance values can be connected in series according to the resistance value of each LED strip at the time of design. , so that the voltage difference between each LED strip and its voltage dividing resistor is equal, so that the voltage of each pin of the IC coupled to the driving converter can be kept consistent, there is basically no voltage difference between the pins, and the IC also has No additional current is generated, the power consumption of the IC is reduced, and the heat generated by the IC is reduced, thereby lowering the temperature of the IC.
  • FIG. 1 is a schematic diagram of a conventional LED backlight driving circuit
  • FIG. 2 is a schematic diagram of an LED backlight driving circuit with an isolating switch
  • FIG. 3 is a schematic diagram of an LED backlight driving circuit according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of an LED backlight driving circuit according to Embodiment 2 of the present invention.
  • FIG. 5 is a schematic diagram of an LED backlight driving circuit with an isolating switch according to Embodiment 2 of the present invention.
  • FIG. 6 is a schematic diagram of a third LED backlight driving circuit according to a third embodiment of the present invention.
  • FIG. 7 is a schematic diagram of an LED backlight driving circuit of a three-band isolation 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 arranged in parallel, wherein at least one LED light bar is connected in series for equalizing LED The voltage dividing resistor of the voltage difference between the light bars.
  • the invention has a voltage dividing resistor for equalizing the voltage difference between the LED strips in series with the LED strip, so that the voltage divider of different resistance values can be connected in series according to the resistance value of each LED strip at the time of design. , so that the voltage difference between each LED strip and its voltage dividing resistor is equal, so that the voltage of each pin of the IC coupled to the driving converter can be kept consistent, there is basically no voltage difference between the pins, and the IC also has No additional current is generated, the power consumption of the IC is reduced, and the heat generated by the IC is reduced, thereby lowering the temperature of the IC.
  • Embodiment 1 will be further described below with reference to the accompanying drawings and preferred embodiments.
  • the voltage dividing resistor is a fixed resistor with a fixed resistance.
  • the other LED strips are connected in series to balance the voltage difference between the LED strips. Fixed resistance with fixed resistance. 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.
  • an output switch of each LED strip is coupled with an isolation switch, and a fixed resistor is connected in series between the LED strip and the isolating switch. Increase the isolation switch. When the LED strip is short-circuited, the isolation switch is disconnected to prevent the branch voltage from being fully loaded into the IC and damaging the IC.
  • 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. On the other hand, since 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.
  • the voltage dividing resistor is a digital potentiometer for adjusting the resistance value by an electric signal.
  • each digital potentiometer is connected with an LED strip, which is respectively DVR1 ⁇ DVR4, so the resistance of each branch of the LED strip is adjustable.
  • the other LED strips are connected in series with a digital potentiometer that adjusts the resistance by an electrical signal.
  • the LED strip with the largest differential pressure as the reference voltage, on the one hand, it can save the electricity of one LED strip. Resistance, on the other hand, because this reference voltage is small, other LED strips can be connected in series with a smaller resistance, which reduces the consumption of electrical energy in the resistor, which is beneficial to reduce energy consumption.
  • each branch of the LED light bar is also connected with an isolating switch Q1 and a connector in series, and the digital potentiometer DVR-terminal is coupled in series to the IC through the isolating switch Q1, and the other end passes through the connector. Coupled in series to the output of the LED strip. Increase the isolation switch. When the LED light bar is short-circuited, the isolation switch is disconnected to prevent the branch voltage from being fully loaded into the IC and damage the IC.
  • the connector is convenient for maintenance.
  • V LEDX VFX
  • the resistance value changes.
  • the digital potentiometer is used, and 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 IC more effectively.
  • the voltage dividing resistor is a variable resistor with adjustable resistance.
  • each variable resistor is connected with one LED strip, which is VR1 ⁇ VR4, respectively.
  • the resistance of each branch of the LED strip is adjustable.
  • the other LED strips are connected in series with a variable resistor with adjustable resistance. 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. Further, as shown in FIG.
  • each branch of the LED light bar is also connected with an isolating switch Q1 and a connector in series, and the variable resistor VR-terminal is coupled in series to the IC through the isolating switch Q1, and the other end passes through the connector. Coupled in series to the output of the LED strip.
  • the isolation switch is added, when the LED light bar is short-circuited, the isolation switch is disconnected, the branch voltage is prevented from being all loaded into the IC, and the IC is damaged; the connector is convenient for the circuit inspection embodiment, and the LED backlight driving circuit manufacturing method is also disclosed.
  • variable resistance circuit with adjustable resistance value is disposed in the current conversion circuit connected in series with the LED light bar, the resistance value of the variable resistance can be adjusted according to the resistance values of different LED light bars before use, so that each The voltage of the LED strip is consistent with the sum of the voltages of the series connected variable resistors.
  • the voltage-dividing resistor of the present invention may also be selected from other types of resistors.
  • the above is a further detailed description of the present invention in conjunction with the specific preferred embodiments. It is not intended that the specific embodiments of the present invention be limited to the description. It will be apparent to those skilled in the art that the present invention can be made in the scope of the present invention without departing from the spirit and scope of the invention.

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

Description

一种 LED背光驱动电路和液晶显示装置、 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背光驱动电路和液 晶显示装置、 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。 在采用 LED 的背光模组中， 如 果使用多条 LED灯条，如图 1、 2所示， LED灯条之间采用并联设置，每条 LED 灯条都串联到同一个的变换器中， 变换器中设有控制的 IC, IC通过连接器跟每 条 LED灯条的输出端耦合， IC和连接器之间串联有隔离开关 Ql。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， 造成加载到变换器 IC上的电压 VLED1、 VLED2, VLED3, VLED4的电压也不一样，有压差就会产生电流， 致使背光驱动变换器中使用的 IC 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能降低背光驱动变换器中 IC温度的 LED背光驱动电路和液晶显示装置、 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，所述至少一 条 LED灯条串联有用于均衡 LED灯条之间压差的分压电阻。
优选的， 所述分压电阻为阻值固定的固定电阻。 采用固定电阻成本较低， 有利于降低原材料成本。
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 固定电阻。 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， 所述固定电阻串联在所述 LED灯条和隔离开关之间。 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 IC,损坏 IC。
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， 所述至少一条 LED灯条串联有用于均衡 LED灯条之间压差的分压电阻， 所述分压电阻为阻值固定的固定电阻。
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 固定电阻。 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， 所述固定电阻串联在所述 LED灯条和隔离开关之间。 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 IC,损坏 IC。
一种 LED背光驱动电路的制造方法， 包括步骤 A: 在 LED灯条所在支路串 联用于均衡 LED灯条之间压差的分压电阻，使得每条 LED灯条之间的压差保持 一致。
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阻 值固定的固定电阻作为分压电阻， 使得 LED灯条跟固定电阻压差之和等于基准 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， 在每条 LED灯条串联隔离开关， 将所述分压电阻 串联在所述 LED灯条和隔离开关之间。 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 IC, 损坏 IC。
本发明由于在 LED灯条串联了用于均衡 LED灯条之间压差的分压电阻，这 样在设计的时候就可以根据每条 LED灯条的阻值不同， 串联不同阻值的分压电 阻， 使得每条 LED灯条跟其分压电阻的压差总和相等， 这样耦合到驱动变换器 中的 IC各引脚的电压能保持一致， 引脚之间基本不存在压差， IC内也就不会产 生额外的电流， 降低了 IC的功耗， IC的发热量随之减少， 从而降低 IC的温度。
【附图说明】
图 1是现有的一种 LED背光驱动电路示意图；
图 2是带隔离开关的 LED背光驱动电路示意图；
图 3是本发明实施例一 LED背光驱动电路示意图；
图 4是本发明实施例二 LED背光驱动电路示意图；
图 5是本发明实施例二带隔离开关的 LED背光驱动电路示意图；
图 6是本发明实施例三 LED背光驱动电路示意图；
图 7是本发明实施例三带隔离开关的 LED背光驱动电路示意图。
【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，其中至少一条 LED 灯条串联有用于均衡 LED灯条之间压差的分压电阻。
本发明由于在 LED灯条串联了用于均衡 LED灯条之间压差的分压电阻，这 样在设计的时候就可以根据每条 LED灯条的阻值不同， 串联不同阻值的分压电 阻， 使得每条 LED灯条跟其分压电阻的压差总和相等， 这样耦合到驱动变换器 中的 IC各引脚的电压能保持一致， 引脚之间基本不存在压差， IC内也就不会产 生额外的电流， 降低了 IC的功耗， IC的发热量随之减少， 从而降低 IC的温度。 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。 实施例一
本实施方式中， 分压电阻为阻值固定的固定电阻， 如图 3所示， 除了压差 最大的一条 LED灯条以外， 其余 LED灯条都串联有用于均衡 LED灯条之间压 差的阻值固定的固定电阻。 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， LED背光驱动电路中， 每条 LED灯条的输出端都耦合有隔离开 关,固定电阻串联在所述 LED灯条和隔离开关之间。 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 IC, 损坏 IC。
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灯条上串联固定电阻， 其中 ( VFx-VF1 ) /1, R2= ( VFX-VF2 )
Figure imgf000006_0001
) /1,如此类推。
这样通过在每一条 LED灯条上面串联不同的电阻就可以使每一串 LED灯条 的电压一致，即 VF1+
Figure imgf000006_0002
R2I =VF3+ R3I =VF4+ R4I =…… =VFX,这样就可以基 本上消除每一串条 LED灯条间的压差， 使得 IC侧的压差 VLEDX保持一致。
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。
实施例二
本实施方式中， 分压电阻为通过电信号调整阻值的数字电位器， 如图 4所 示，图中有 4条 LED灯条，每个数字电位器连接一条 LED灯条，分别为 DVR1 ~ 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 5所示， 每条 LED灯条所在支路还串联有隔离开关 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 IC, 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 IC, 损坏 IC; 采用连接器方便检修。
本实施方式还公开了一种 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+ DVR1= 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 IC引脚之间的压差自然也就 4艮小， 即 VLEDX保持一致， 最接近于 IC所需要的电压值， 从而减少 IC的发热量。
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， 而本实施 方式采用数字电位器， 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 IC的发热量。
实施例三
本实施方式中， 分压电阻为阻值可调的可变电阻， 如图 6所示， 图中有 4 条 LED灯条， 每个可变电阻连接一条 LED灯条， 分别为 VR1 ~ VR4, 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灯条都串联有阻值可调的可变电阻。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 7所示， 每条 LED灯条所在支路还串联有隔离开关 Q1和 连接器，所可变电阻 VR—端通过隔离开关 Q1串联耦合到所述 IC, 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 IC, 损坏 IC; 采用连接器方便电路的检 本实施方式还公开了一种 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灯条上串联可变电阻，通过手工或机械 方式调节可变电阻的电阻， 使得 VF1+ VR1= VF2+ VR2= VF3+ VR3= VF4+ VR4=…… =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 IC引脚之间的压差自然也就 4艮小， 即 VLEDX保持一致， 最接近于 IC所需要的电压值， 从而减少 IC的发热量。
本实施方式由于在跟 LED灯条串联的变流电路内设置了阻值可调的可变电 阻， 这样在使用之前可以先根据不同 LED灯条的阻值调整可变电阻的阻值， 使 得每条 LED灯条电压与其串接的可变电阻的电压之和保持一致。
本发明的分压电阻还可以选用其他种类的电阻， 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， 包括至少两条并联设置的 LED灯条， 所述至 少一条 LED灯条串联有用于均衡 LED灯条之间压差的分压电阻。
2、 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述分压电阻为 阻值固定的固定电阻。
3、 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灯条都串联有所述固定电阻。
4、 如权利要求 2所述的一种 LED背光驱动电路， 其中， 所述固定电阻串 联在所述 LED灯条和隔离开关之间。
5、 一种液晶显示装置， 包括一种 LED背光驱动电路， 其中， 所述 LED背 光驱动电路包括至少两条并联设置的 LED灯条，所述至少一条 LED灯条串联有 用于均衡 LED灯条之间压差的分压电阻，所述分压电阻为阻值固定的固定电阻。
6、如权利要求 5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灯条都串联有所述固定电阻。
7、 如权利要求 5所述的一种液晶显示装置， 其中， 所述固定电阻串联在所 述 LED灯条和隔离开关之间。
8、 一种 LED背光驱动电路的制造方法， 包括步骤 A: 在 LED灯条所在支 路串联用于均衡 LED灯条之间压差的分压电阻，使得每条 LED灯条之间的压差 保持一致。
9、 如权利要求 8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阻 值固定的固定电阻作为分压电阻， 使得 LED灯条跟固定电阻压差之和等于基准 电压。
10、 如权利要求 8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， 在每条 LED灯条串联隔离开关， 将所述分压电阻串联在所述 LED 灯条和隔离开关之间。
PCT/CN2012/077500 2012-06-21 2012-06-26 一种led背光驱动电路和液晶显示装置、制造方法 Ceased WO2013189093A1 (zh)

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