WO2014075337A1 - 降低待机功耗的方法 - Google Patents

降低待机功耗的方法 Download PDF

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Publication number
WO2014075337A1
WO2014075337A1 PCT/CN2012/085225 CN2012085225W WO2014075337A1 WO 2014075337 A1 WO2014075337 A1 WO 2014075337A1 CN 2012085225 W CN2012085225 W CN 2012085225W WO 2014075337 A1 WO2014075337 A1 WO 2014075337A1
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WIPO (PCT)
Prior art keywords
pin
led driver
driver chip
comparator
effect transistor
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PCT/CN2012/085225
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English (en)
French (fr)
Inventor
张先明
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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 US13/806,775 priority Critical patent/US9066398B2/en
Priority to DE112012007138.7T priority patent/DE112012007138B4/de
Publication of WO2014075337A1 publication Critical patent/WO2014075337A1/zh

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    • 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
    • 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
    • G09G2320/064Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/021Power management, e.g. power saving

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to a method for reducing power consumption of an LED driver chip during standby. Background technique
  • Standby power consumption refers to the energy consumption of home appliances when they are turned off or not using their original functions. Unlike the effective energy consumption generated by home appliances during use, standby power consumption is basically an energy waste. According to the statistics of international authoritative organizations: The standby power consumption of household appliances in the world accounts for 3% ⁇ 13% of the electricity consumption of civilians, accounting for 2% of the total power generation. Among them, the standby energy consumption of TV and other audio and video accounts for 68.6% of the total standby energy consumption. The average standby consumption of existing TV sets in China is as high as 8.07W/set.
  • EACEM European Industrial Alliance
  • AUDIO PRODUCTS audio products
  • standby power consumption must be less than 5W, from 2004 1 It will be less than 3W from the 1st of January and will be less than 1W from January 1, 2007.
  • China has also proposed regulations: Since March 1, 2006, TVs with standby power consumption greater than 9W will be banned from sales, and energy conservation is rated at 1W.
  • the backlight of the LCD TV mostly uses an LED light source, and the driving chip of the LED lamp generally needs three kinds of signals, namely VCC, BLON and PDIM, as shown in FIG. 1 , where VCC is the input voltage and BLON is enabled.
  • Signal, PDIM is the dimming signal.
  • the VCC voltage is always present.
  • the PDIM voltage will remain low.
  • the shortcoming in the prior art is that in the case of standby, the BLON signal may be at a high level. At this time, most of the functions of the LED driver chip have begun to work, which will increase the loss of the LED driver chip, that is, Increase standby power consumption.
  • the present invention provides a method of reducing standby power consumption, including the following steps:
  • Step 100 Providing an LED driving chip, wherein the LED driving chip has: a brightness control pin, a high voltage switch pin, a first power pin, and a first ground pin;
  • Step 200 Providing a comparator, a field effect transistor, and an integrator, wherein the comparator has: a non-inverting input terminal, an inverting input terminal, and a first output end, wherein the integrator has: a first input end, a second input end, and Second output;
  • Step 300 electrically connecting the first input end of the integrator to the brightness control pin of the LED driving chip, electrically connecting the second output end to the inverting input end of the comparator, and connecting the non-inverting input end Grounding, electrically connecting the first output end to the field effect transistor, and electrically connecting the field effect transistor to the high voltage switch pin and the ground line of the LED driving chip;
  • Step 400 providing a first power source, a second power source, a control source, a resistor, and a reference voltage, electrically connecting the first power pin of the LED driver chip to the first power source, and electrically connecting the first ground pin to the ground wire
  • the high voltage switch pin of the LED driver chip is electrically connected to the second power source through a resistor, the brightness control pin and the first input end are electrically connected to the control source, and the second input pin of the integrator is connected to the reference. Voltage;
  • Step 500 Turn on the first power source, the second power source, the control source, and the reference voltage, and the integrator and the comparator control the conduction of the field effect transistor according to the signal on the brightness control pin, thereby forcibly pulling down the LED driver chip high voltage The voltage at the switch pin.
  • the magnitude of the reference voltage is calculated based on a maximum voltage value, a minimum voltage value, and a minimum duty ratio of a control signal output from the control source.
  • the reference voltage is sized such that the output voltage of the integrator is greater than ov.
  • the comparator further has: a second power pin and a second ground pin, wherein the second power pin and the second ground pin are used for external working power of the comparator.
  • the comparator model is LM324.
  • the field effect transistor has: a gate, a source and a drain.
  • the gate is electrically connected to the first output
  • the source is connected to the ground
  • the drain is It is electrically connected to the high voltage switch pin of the LED driver chip.
  • the field effect transistor is an N-channel type field effect transistor.
  • the LED driver chip also has a plurality of output pins for respectively connecting the LED lamps.
  • the number of output pins of the LED driver chip is six.
  • the LED driver chip models are TLC5941, MBI5028 and ST2221C.
  • the invention also provides a method for reducing standby power consumption, comprising the following steps:
  • Step 100 Providing an LED driving chip, wherein the LED driving chip has: a brightness control pin, a high voltage switch pin, a first power pin, and a first ground pin;
  • Step 200 Providing a comparator, a field effect transistor, and an integrator, wherein the comparator has: a non-inverting input terminal, an inverting input terminal, and a first output end, wherein the integrator has: a first input end, a second input end, and Second output;
  • Step 300 electrically connecting the first input end of the integrator to the brightness control pin of the LED driving chip, electrically connecting the second output end to the inverting input end of the comparator, and connecting the non-inverting input end Grounding, electrically connecting the first output end to the field effect transistor, and electrically connecting the field effect transistor to the high voltage switch pin and the ground line of the LED driving chip;
  • Step 400 providing a first power source, a second power source, a control source, a resistor, and a reference voltage
  • the first power pin of the LED driver chip is electrically connected to the first power source, the first ground pin is electrically connected to the ground wire, and the high voltage switch pin of the LED driver chip is electrically connected to the second power source through a resistor,
  • the brightness control pin and the first input are electrically connected to the control source, and the second input pin of the integrator is connected to the reference voltage;
  • Step 500 Turn on the first power source, the second power source, the control source, and the reference voltage, and the integrator and the comparator control the conduction of the field effect transistor according to the signal on the brightness control pin, thereby forcibly pulling down the LED driver chip high voltage The voltage at the switch pin;
  • the magnitude of the reference voltage is calculated according to a maximum voltage value, a minimum voltage value, and a minimum duty ratio of a control signal output by the control source;
  • the magnitude of the reference voltage can cause the output voltage of the integrator to be greater than 0V;
  • the comparator further has: a second power pin and a second ground pin, wherein the second power pin and the second ground pin are used for external working power of the comparator;
  • the comparator model is LM324
  • the field effect transistor has: a gate, a source, and a drain.
  • the gate is electrically connected to the first output end, and the source is connected to the ground.
  • the drain is electrically connected to the high voltage switch pin of the LED driving chip;
  • the field effect transistor is an N-channel field effect transistor
  • the LED driving chip further has a plurality of output pins, and the plurality of output pins are used Connect LED lights separately;
  • the number of output pins of the LED driving chip is six;
  • the LED driver chip models are TLC5941, MBI5028 and ST2221C.
  • Advantageous Effects of the Invention collects the signal of the brightness control pin of the LED driving chip IC through the comparator and the integrator, and the output control level is connected to the high voltage of the LED driving chip during standby of the liquid crystal display.
  • the field effect transistor of the switch pin forcibly pulling down the voltage of the high voltage switch pin, to achieve the purpose of turning off most functions of the LED driver chip, can effectively reduce the loss of the LED driver chip during standby, thereby reducing standby power consumption. This method is simple to implement.
  • FIG. 1 is a schematic view showing a pin structure of an LED driving chip in the prior art
  • FIG. 2 is a flow chart of a method for reducing standby power consumption according to the present invention
  • FIG. 3 is a schematic diagram showing the circuit structure of a method for reducing standby power consumption according to the present invention. detailed description
  • the present invention provides a method for reducing standby power consumption, including the following steps:
  • Step 100 providing an LED driver chip
  • the LED driver chip 20 has: a brightness control pin PDIM 3, a high voltage switch pin BLON 4 and a first power pin VCC 9 and a first ground pin 10;
  • the LED driving chip 20 also has a plurality of output pins 1, 2, 5, 6, 7, 8 ..., and the plurality of output pins 1, 2, 5, 6, 7, 8... are used for Connect the LED lights separately to drive the LEDs to illuminate.
  • the number of output pins of the LED driving chip 20 is six, but not limited to six.
  • the LED driving chip 20 is in accordance with the duty of the signal of the brightness control pin PDIM 3
  • the size of the ratio controls the brightness of the LED lamp driven by the LED driving chip 20, and the brightness of the LED lamp can be varied to meet various needs.
  • the high voltage switch pin BLON 4 is mainly used as an enable signal for controlling whether the LED driving chip 20 operates or is turned off.
  • the first power pin VCC 9 is used for an external power supply to provide power conditions for the operation of the LED driver chip 20.
  • the LED driver chip 20 may be of the type TLC5941, MBI5028, and ST2221C.
  • Step 200 providing a comparator 40, a field effect transistor Q and an integrator 60
  • the comparator 40 has: a non-inverting input terminal 15, an inverting input terminal 14 and a first output terminal 11, the integrator 60 having: An input terminal 16, a second input terminal 17 and a second output terminal 18;
  • the comparator 40 further has: a second power pin 12 and a second ground pin 13 , wherein the second power pin 12 and the second ground pin 13 are used for externally operating the comparator, the comparator 40
  • the operating voltage range is 3-30V.
  • the field effect transistor Q is preferably an N-channel type field effect transistor having a gate g, a source s and a drain d, and voltage control applied to the gate g The field effect transistor Q is turned on and off.
  • Field-effect transistor Q as an electronic switching circuit has a much higher response speed than ordinary switches, and has high input resistance (10 8 ⁇ 10 9 ⁇ ), low noise, low power consumption, large dynamic range, easy integration, no secondary breakdown. Phenomenon, safe working area and other advantages.
  • the integrator 60 can be integrated to obtain an output signal according to the signals input by the first and second input terminals 16 and 17, and output the output signal to the second output terminal 18.
  • the comparator 40 can output a voltage according to the magnitude of the two voltages input by the non-inverting input terminal 15 and the inverting input terminal 14.
  • the positive and negative voltages of the output voltage are mainly based on the non-inverting input terminal 15 and the inverting input terminal 14
  • the magnitude relationship of the two voltages input is determined.
  • the voltage on the non-inverting input terminal 15 is greater than the voltage on the inverting input terminal 14, and the voltage output by the comparator 40 is positive, whereas the voltage on the non-inverting input terminal 15 is less than the voltage on the inverting input terminal 14, the comparison The voltage output from device 40 is negative.
  • the comparator 40 model is LM324.
  • Step 300 The first input end 16 of the integrator 60 is electrically connected to the brightness control pin PDIM 3 of the LED driving chip 20, and the second output end 18 is electrically connected to the inverting input end 14 of the comparator 40. Connecting the non-inverting input terminal 15 to the ground, and electrically connecting the first output terminal 11 to the field effect transistor Q, respectively, and the field effect transistor Q and the high voltage switch pin BLON 4 of the LED driving chip 20, ground. Electrical connection
  • step 300 the gate g is electrically connected to the first output end 11, and the source s is Connected to the ground, the drain d is electrically connected to the high voltage switch pin BLON 4 of the LED driving chip 20.
  • Step 400 providing a first power source 80, a second power source 30, a control source 70, a resistor R, and a reference voltage 50, electrically connecting the first power pin 9 of the LED driving chip 20 to the first power source 80, and the first grounding
  • the pin 10 is electrically connected to the ground
  • the high voltage switch pin 4 of the LED driver chip 20 is electrically connected to the second power source 30 through the resistor R
  • the brightness control pin 3 and the first input terminal 16 are electrically connected to the control source 70.
  • the magnitude of the reference voltage 50 is calculated based on the maximum voltage value, the minimum voltage value, and the minimum duty ratio of the control signal output from the control source 70.
  • the control signal output by the control source 70 is the minimum duty ratio
  • the reference voltage 50 is sized such that the output voltage of the integrator 60 is greater than 0V, thus ensuring the field effect transistor during the dimming of the brightness control pin PDIM 3 Q will not turn on, and the high voltage switch pin BLON 4 can work normally.
  • the integrator 60 can output a negative voltage according to the signal output from the control source 70 and the reference voltage 50.
  • Step 500 Turn on the first power source 80, the second power source 30, the control source 70, and the reference voltage
  • the integrator 60 and the comparator 40 control the conduction of the field effect transistor Q according to the signal on the brightness control pin PDIM 3, thereby forcibly pulling down the voltage of the high voltage switch pin 4 of the LED driving chip 20.
  • the integrator 60 and the comparator 40 control the conduction of the field effect transistor Q according to the signal on the brightness control pin PDIM 3, that is, when the liquid crystal display to which the method is applied is in standby, turn on the field effect transistor Q, forcibly pull
  • the low LED driver chip 20 high voltage switches the voltage of the pin 4, thereby turning off most of the functions of the LED driver chip 20, thereby achieving the purpose of reducing standby power consumption.
  • the LED driving chip 20 When the brightness control pin PDIM 3 of the LED driving chip 20 is at a low duty ratio, the LED driving chip 20 is in a standby state, and the low duty ratio signal is combined with the reference loaded on the integrator 60.
  • the voltage 50 is integrated in the integrator 60, and a negative voltage is output to the inverting input terminal 14 of the comparator 40.
  • the forward input terminal 15 of the comparator 40 is connected to the ground, so that the voltage on the inverting input terminal 14 is low.
  • the first output terminal 11 of the comparator 40 outputs a high level, driving the field effect transistor Q to turn on.
  • the field effect transistor Q is turned on, and the voltage connected to the high level switch pin 4 of the LED driving chip 20 is forcibly pulled low, and the high level switch pin 4 is at a low level control, so that the Most of the functions of the LED driver chip 20 achieve the purpose of reducing standby power consumption.
  • the present invention provides a method for reducing standby power consumption, collecting signals of an LED control chip IC brightness control pin through a comparator and an integrator, and outputting when the liquid crystal display is in standby mode.
  • the control level turns on the field effect transistor connected to the high voltage switch pin of the LED driver chip, thereby forcibly pulling down the voltage of the high voltage switch pin, thereby achieving the purpose of turning off most functions of the LED driver chip, thereby effectively reducing the standby LED driver.
  • the loss of the chip which in turn reduces standby power consumption, is simple to implement.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

本发明提供一种降低待机功耗的方法,包括以下步骤:步骤100、提供一LED驱动芯片,该LED驱动芯片包括:亮度控制引脚及高压开关引脚;步骤200、提供比较器、场效应晶体管及积分器;步骤300、将该积分器与LED驱动芯片的亮度控制引脚电性连接,将积分器与比较器电性连接,将比较器与场效应晶体管电性连接,将该场效应晶体管与LED驱动芯片电性连接;步骤400、提供第一电源、第二电源、控制源、电阻及参考电压,将LED驱动芯片与第一电源电性连接,将LED驱动芯片的高压开关引脚通过电阻电性连接至第二电源,将亮度控制引脚及积分器与控制源电性连接,并将积分器连接至参考电压;步骤500、接通第一电源、第二电源、控制源及参考电压,所述积分器及比较器根据亮度控制引脚上的信号控制场效应晶体管的导通,进而强行拉低LED驱动芯片高压开关引脚的电压。

Description

降低待机功耗的方法 技术领域
本发明涉及液晶显示领域, 尤其涉及一种待机时降低 LED 驱动芯片 功耗的方法。 背景技术
当前节能环保已成为世界各国的共识 , 如何降低液晶电视待机功耗已 成为全球性产业一个技术热点, 而且在经济危机大背景下, 实惠节能家电 产品明显更受消费者欢迎, 在整机领域, 国内一些机构也联合整机企业进 行了平板电视的节能认证。
待机功耗是指家电产品在关机或不使用其原始功能时的能源消耗。 与 家电产品在使用过程中产生的有效耗能不同, 待机功耗基本上是一种能源 浪费。 据国际权威机构统计: 世界上家电待机功耗占民用电力消耗的 3%〜13%, 约占总发电量的 2%,其中电视等视听的待机能耗占了总待机能 耗的 68.6%, 而我国现有电视机的平均待机消耗高达 8.07W/台。
为了节省有限的电力资源, EACEM ( European Industrial Alliance , 欧 洲工业联盟)规定, 从 2001年 1 月 1 日起, 进入欧洲的 AUDIO PRODUCTS (音频产品) , 待机功耗必须低于 5W, 从 2004年 1月 1 日起将低 于 3W, 从 2007年 1月 1 日起将低于 1W。 而我国也提出了规定: 自 2006 年 3月 1 日起待机功耗大于 9W的电视机将禁止销售, 节能评价为 1W。 现有技术中, 液晶电视的背光源多采用 LED光源, 而 LED灯的驱动芯片 一般需要三种信号, 即 VCC、 BLON及 PDIM, 如图 1 所示, 其中 VCC 为输入电压, BLON 为使能信号, PDIM 为调光信号。 在使用的过程中, 一般是 VCC 电压一直存在, 当进入待机程序中, 会有 PDIM 的电压一直 为低电平。
但是, 现有技术中存在的缺陷就是忽略了在待机的情况下, BLON信 号有可能是高电平, 这个时候 LED驱动芯片的大部分功能已开始工作, 会增大 LED驱动芯片的损耗, 即增加待机功耗。
由此可知, 如何提供有效降低的液晶显示器待机功耗的驱动电路及方 法, 降低液晶显示器在待机模式下 LED 驱动芯片的消耗, 是从事此相关 行业的技术领域者亟于改善的课题。 发明内容
本发明的目的在于提供一种降低待机功耗的方法, 可以强行拉低 LED 驱动芯片高压开关引脚上的电压, 可以有效地降低待机时 LED 驱动芯片 IC的损耗, 进而降低待机的功耗。
为实现上述目的, 本发明提供一种降低待机功耗的方法, 包括以下步 骤:
步骤 100、 提供一 LED驱动芯片, 所述 LED驱动芯片具有: 亮度控 制引脚、 高压开关引脚、 第一电源引脚及第一接地引脚;
步骤 200、 提供比较器、 场效应晶体管及积分器, 所述比较器具有: 同相输入端、 反相输入端及第一输出端, 所述积分器具有: 第一输入端、 第二输入端及第二输出端;
步骤 300、 将所述积分器的第一输入端与 LED驱动芯片的亮度控制引 脚电性连接, 将第二输出端与比较器的反相输入端电性连接, 并将所述同 相输入端接地, 将第一输出端与场效应晶体管电性连接, 将该场效应晶体 管分别与 LED驱动芯片的高压开关引脚、 地线电性连接;
步骤 400、 提供第一电源、 第二电源、 控制源、 电阻及参考电压, 将 LED驱动芯片的第一电源引脚电性连接至第一电源, 将第一接地引脚电性 连接至地线, 将 LED 驱动芯片的高压开关引脚通过电阻电性连接至第二 电源, 将亮度控制引脚及第一输入端与控制源电性连接, 并将积分器的第 二输入引脚连接至参考电压;
步骤 500、 接通第一电源、 第二电源、 控制源及参考电压, 所述积分 器及比较器根据亮度控制引脚上的信号控制场效应晶体管的导通, 进而强 行拉低 LED驱动芯片高压开关引脚的电压。
所述参考电压的大小根据控制源输出的控制信号的最大电压值、 最小 电压值及最小占空比计算得到。
当控制源输出的控制信号为最小占空比时, 所述参考电压的大小能使 得积分器的输出电压大于 ov。
所述比较器还具有: 第二电源引脚及第二接地引脚, 该第二电源引脚 及第二接地引脚用于外接比较器的工作电源。
所述比较器型号为 LM324。
所述场效应晶体管具有: 栅极、 源极及漏极, 所述步骤 300 中将所述 栅极与第一输出端电性连接, 将所述源极连接至地线, 将所述漏极与 LED 驱动芯片的高压开关引脚电性连接。
所述场效应晶体管为 N沟道型场效应晶体管。 所述 LED 驱动芯片还具有数个输出引脚, 该数个输出引脚用于分别 连接 LED灯。
所述 LED驱动芯片的输出引脚的数量为 6个。
所述 LED驱动芯片型号为 TLC5941、 MBI5028及 ST2221C。
本发明还提供一种降低待机功耗的方法, 包括以下步骤:
步骤 100、 提供一 LED驱动芯片, 所述 LED驱动芯片具有: 亮度控 制引脚、 高压开关引脚、 第一电源引脚及第一接地引脚;
步骤 200、 提供比较器、 场效应晶体管及积分器, 所述比较器具有: 同相输入端、 反相输入端及第一输出端, 所述积分器具有: 第一输入端、 第二输入端及第二输出端;
步骤 300、 将所述积分器的第一输入端与 LED驱动芯片的亮度控制引 脚电性连接, 将第二输出端与比较器的反相输入端电性连接, 并将所述同 相输入端接地, 将第一输出端与场效应晶体管电性连接, 将该场效应晶体 管分别与 LED驱动芯片的高压开关引脚、 地线电性连接;
步骤 400、 提供第一电源、 第二电源、 控制源、 电阻及参考电压, 将
LED驱动芯片的第一电源引脚电性连接至第一电源, 将第一接地引脚电性 连接至地线, 将 LED 驱动芯片的高压开关引脚通过电阻电性连接至第二 电源, 将亮度控制引脚及第一输入端与控制源电性连接, 并将积分器的第 二输入引脚连接至参考电压;
步骤 500、 接通第一电源、 第二电源、 控制源及参考电压, 所述积分 器及比较器根据亮度控制引脚上的信号控制场效应晶体管的导通, 进而强 行拉低 LED驱动芯片高压开关引脚的电压;
其中, 所述参考电压的大小根据控制源输出的控制信号的最大电压 值、 最小电压值及最小占空比计算得到;
其中, 当控制源输出的控制信号为最小占空比时, 所述参考电压的大 小能使得积分器的输出电压大于 0V;
其中, 所述比较器还具有: 第二电源引脚及第二接地引脚, 该第二电 源弓 )脚及第二接地引脚用于外接比较器的工作电源;
其中, 所述比较器型号为 LM324;
其中, 所述场效应晶体管具有: 栅极、 源极及漏极, 所述步骤 300 中 将所述栅极与第一输出端电性连接, 将所述源极连接至地线, 将所述漏极 与 LED驱动芯片的高压开关引脚电性连接;
其中, 所述场效应晶体管为 N沟道型场效应晶体管;
其中, 所述 LED 驱动芯片还具有数个输出引脚, 该数个输出引脚用 于分别连接 LED灯;
其中, 所述 LED驱动芯片的输出引脚的数量为 6个;
其中, 所述 LED驱动芯片型号为 TLC5941、 MBI5028及 ST2221C。 本发明的有益效果: 本发明降低待机功耗的方法通过比较器和积分器 采集 LED驱动芯片 IC亮度控制引脚的信号, 在液晶显示屏待机时输出控 制电平导通接于 LED 驱动芯片高压开关引脚的场效应晶体管, 从而强行 拉低高压开关引脚的电压, 达到关闭 LED 驱动芯片的大部分功能的目 的, 可以有效地降低待机时 LED 驱动芯片的损耗, 进而降低待机的功 耗, 该方法实现简单。
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。 附图说明
下面结合附图, 通过对本发明的具体实施方式详细描述, 将使本发明 的技术方案及其它有益效果显而易见。
附图中,
图 1为现有技术中 LED驱动芯片的引脚结构示意图;
图 2为本发明降低待机功耗的方法的流程图;
图 3为本发明降低待机功耗的方法的电路结构示意图。 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及 3 , 本发明提供一种降低待机功耗的方法, 包括以下步 骤:
步骤 100、 提供一 LED驱动芯片, 所述 LED驱动芯片 20具有: 亮度 控制引脚 PDIM 3、 高压开关引脚 BLON 4及第一电源引脚 VCC 9及第一 接地引脚 10;
所述 LED驱动芯片 20还具有数个输出引脚 1、 2、 5、 6、 7、 8 ... , 该 数个输出引脚 1、 2、 5、 6、 7、 8...用于分别连接 LED灯, 进而驱动 LED 灯发光。 在本较佳实施例中, 所述 LED驱动芯片 20的输出引脚的数量为 6个, 但不限于 6个。
所述 LED驱动芯片 20根据所述亮度控制引脚 PDIM 3的信号的占空 比的大小控制由该 LED驱动芯片 20所驱动的 LED灯的亮度大小, 实现 LED灯的亮度可变化, 满足各种需求。
所述高压开关引脚 BLON 4主要作为使能信号, 用于控制该 LED驱 动芯片 20的工作还是截止。
所述第一电源引脚 VCC 9用于外接电源, 为该 LED驱动芯片 20的工 作提供电源条件。
所述 LED驱动芯片 20型号可以为 TLC5941、 MBI5028及 ST2221C 等。
步骤 200、 提供一比较器 40、 场效应晶体管 Q及积分器 60, 所述比 较器 40具有: 同相输入端 15、 反相输入端 14及第一输出端 11 , 所述积 分器 60具有: 第一输入端 16、 第二输入端 17及第二输出端 18;
所述比较器 40还具有: 第二电源引脚 12及第二接地引脚 13 , 该第二 电源引脚 12及第二接地引脚 13用于外接比较器的工作电源, 该比较器 40 的工作电压范围为 3-30V。
在本较佳实施例中, 所述场效应晶体管 Q优选为 N 沟道型场效应晶 体管, 其具有: 栅极 g、 源极 s及漏极 d, 施加于所述栅极 g上的电压控制 所述场效应晶体管 Q的导通与截止。
场效应晶体管 Q作为电子开关电路其反应速度远远大于普通开关, 且 具有输入电阻高 (108 ~ 109 Ω ) 、 噪声小、 功耗低、 动态范围大、 易于集 成、 没有二次击穿现象、 安全工作区域宽等优点。
所述积分器 60可以根据第一及第二输入端 16及 17输入的信号经过 运算积分得到一输出信号, 并将该输出信号输出至所述的第二输出端 18。 所述比较器 40可根据同相输入端 15及反向输入端 14输入的两电压的大 小经过运算输出一个电压, 所述输出的电压的正负, 主要根据同相输入端 15及反向输入端 14输入的两电压的大小关系确定。 具体的, 同相输入端 15上的电压大于反相输入端 14上的电压, 该比较器 40输出的电压为正, 反之同相输入端 15 上的电压小于反相输入端 14 上的电压, 该比较器 40 输出的电压为负。 在本较佳实施例中, 所述比较器 40型号为 LM324。
步骤 300、 将所述积分器 60的第一输入端 16与 LED驱动芯片 20的 亮度控制引脚 PDIM 3电性连接, 将所述第二输出端 18与比较器 40的反 相输入端 14 电性连接, 并将所述同相输入端 15接地, 将第一输出端 11 与场效应晶体管 Q电性连接, 将该场效应晶体管 Q分别与 LED驱动芯片 20的高压开关引脚 BLON 4、 地线电性连接;
在步骤 300中将所述栅极 g与第一输出端 11电性连接, 将所述源极 s 连接至地线, 将所述漏极 d与 LED驱动芯片 20的高压开关引脚 BLON 4 电性连接。
步骤 400、 提供第一电源 80、 第二电源 30、 控制源 70、 电阻 R及参 考电压 50, 将 LED驱动芯片 20的第一电源引脚 9 电性连接至第一电源 80, 将第一接地引脚 10 电性连接至地线, 将 LED驱动芯片 20的高压开 关引脚 4通过电阻 R电性连接至第二电源 30, 将亮度控制引脚 3及第一 输入端 16与控制源 70电性连接, 并将积分器 60的第二输入引脚 17连接 至参考电压 50;
所述参考电压 50 的大小根据控制源 70 输出的控制信号的最大电压 值、 最小电压值及最小占空比计算得到。 当控制源 70 输出的控制信号为 最小占空比时, 所述参考电压 50的大小能使得积分器 60的输出电压大于 0V, 这样在亮度控制引脚 PDIM 3调光的过程中保证场效应晶体管 Q不会 导通, 高压开关引脚 BLON 4可以正常工作。 所述积分器 60根据控制源 70输出的信号及参考电压 50可以输出负电压。
步骤 500、 接通第一电源 80、 第二电源 30、 控制源 70及参考电压
50, 所述积分器 60及比较器 40根据亮度控制引脚 PDIM 3上的信号控制 场效应晶体管 Q的导通, 进而强行拉低 LED驱动芯片 20高压开关引脚 4 的电压。
所述积分器 60及比较器 40根据亮度控制引脚 PDIM 3上的信号控制 场效应晶体管 Q的导通, 即当应用该方法的液晶显示器处于待机时, 导通 该场效应晶体管 Q, 强行拉低 LED驱动芯片 20高压开关引脚 4的电压, 从而关闭 LED驱动芯片 20的大部分功能, 达到降低待机功耗的目的。
本发明降低待机功耗的方法的工作原理具体如下:
当所述 LED驱动芯片 20 的亮度控制引脚 PDIM 3 处于低的占空比 时, 该 LED驱动芯片 20处于待机状态, 该低的占空比信号结合加载在该 积分器 60上的所述参考电压 50在积分器 60进行积分运算, 输出一负电 压至比较器 40 的反相输入端 14, 其比较器 40 的正向输入端 15 连接地 线, 故此时反相输入端 14上的电压低于正相输入端 15上的电压, 因此该 比较器 40的第一输出端 11输出高电平, 驱动所述场效应晶体管 Q导通。 场效应晶体管 Q导通, 将所述连接在 LED驱动芯片 20高电平开关引脚 4 上的电压强行拉低, 该高电平开关引脚 4处于低电平控制, 这样就可以关 闭所述 LED驱动芯片 20的大部分功能, 达到降低待机功耗的目的。
综上所述, 本发明提供一种降低待机功耗的方法, 通过比较器和积分 器采集 LED驱动芯片 IC亮度控制引脚的信号, 在液晶显示屏待机时输出 控制电平导通接于 LED 驱动芯片高压开关引脚的场效应晶体管, 从而强 行拉低高压开关引脚的电压, 达到关闭 LED 驱动芯片的大部分功能的目 的, 可以有效地降低待机时 LED 驱动芯片的损耗, 进而降低待机的功 耗, 该方法实现简单。
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 都应属于本发明权利要求的保护范围。

Claims

权 利 要 求
1、 一种降低待机功耗的方法, 包括以下步骤:
步骤 100、 提供一 LED驱动芯片, 所述 LED驱动芯片具有: 亮度控 制引脚、 高压开关引脚、 第一电源引脚及第一接地引脚;
步骤 200、 提供比较器、 场效应晶体管及积分器, 所述比较器具有: 同相输入端、 反相输入端及第一输出端, 所述积分器具有: 第一输入端、 第二输入端及第二输出端;
步骤 300、 将所述积分器的第一输入端与 LED驱动芯片的亮度控制引 脚电性连接, 将第二输出端与比较器的反相输入端电性连接, 并将所述同 相输入端接地, 将第一输出端与场效应晶体管电性连接, 将该场效应晶体 管分别与 LED驱动芯片的高压开关引脚、 地线电性连接;
步骤 400、 提供第一电源、 第二电源、 控制源、 电阻及参考电压, 将 LED驱动芯片的第一电源引脚电性连接至第一电源, 将第一接地引脚电性 连接至地线, 将 LED 驱动芯片的高压开关引脚通过电阻电性连接至第二 电源, 将亮度控制引脚及第一输入端与控制源电性连接, 并将积分器的第 二输入引脚连接至参考电压;
步骤 500、 接通第一电源、 第二电源、 控制源及参考电压, 所述积分 器及比较器根据亮度控制引脚上的信号控制场效应晶体管的导通, 进而强 行拉低 LED驱动芯片高压开关引脚的电压。
2、 如权利要求 1 所述的降低待机功耗的方法, 其中, 所述参考电压 的大小根据控制源输出的控制信号的最大电压值、 最小电压值及最小占空 比计算得到。
3、 如权利要求 2 所述的降低待机功耗的方法, 其中, 当控制源输出 的控制信号为最小占空比时, 所述参考电压的大小能使得积分器的输出电 压大于 0V。
4、 如权利要求 1 所述的降低待机功耗的方法, 其中, 所述比较器还 具有: 第二电源引脚及第二接地引脚, 该第二电源引脚及第二接地引脚用 于外接比较器的工作电源。
5、 如权利要求 4 所述的降低待机功耗的方法, 其中, 所述比较器型 号为 LM324。
6、 如权利要求 1 所述的降低待机功耗的方法, 其中, 所述场效应晶 体管具有: 栅极、 源极及漏极, 所述步骤 300 中将所述栅极与第一输出端 电性连接, 将所述源极连接至地线, 将所述漏极与 LED驱动芯片的高压 开关引脚电性连接。
7、 如权利要求 6 所述的降低待机功耗的方法, 其中, 所述场效应晶 体管为 N沟道型场效应晶体管。
8、 如权利要求 1所述的降低待机功耗的方法, 其中, 所述 LED驱动 芯片还具有数个输出引脚, 该数个输出引脚用于分别连接 LED灯。
9、 如权利要求 8所述的降低待机功耗的方法, 其中, 所述 LED驱动 芯片的输出引脚的数量为 6个。
10、 如权利要求 8 所述的降低待机功耗的方法, 其中, 所述 LED驱 动芯片型号为 TLC5941、 MBI5028及 ST2221C。
11、 一种降低待机功耗的方法, 包括以下步骤:
步骤 100、 提供一 LED驱动芯片, 所述 LED驱动芯片具有: 亮度控 制引脚、 高压开关引脚、 第一电源引脚及第一接地引脚;
步骤 200、 提供比较器、 场效应晶体管及积分器, 所述比较器具有: 同相输入端、 反相输入端及第一输出端, 所述积分器具有: 第一输入端、 第二输入端及第二输出端;
步骤 300、 将所述积分器的第一输入端与 LED驱动芯片的亮度控制引 脚电性连接, 将第二输出端与比较器的反相输入端电性连接, 并将所述同 相输入端接地, 将第一输出端与场效应晶体管电性连接, 将该场效应晶体 管分别与 LED驱动芯片的高压开关引脚、 地线电性连接;
步骤 400、 提供第一电源、 第二电源、 控制源、 电阻及参考电压, 将 LED驱动芯片的第一电源引脚电性连接至第一电源, 将第一接地引脚电性 连接至地线, 将 LED 驱动芯片的高压开关引脚通过电阻电性连接至第二 电源, 将亮度控制引脚及第一输入端与控制源电性连接, 并将积分器的第 二输入引脚连接至参考电压;
步骤 500、 接通第一电源、 第二电源、 控制源及参考电压, 所述积分 器及比较器根据亮度控制引脚上的信号控制场效应晶体管的导通, 进而强 行拉低 LED驱动芯片高压开关引脚的电压;
其中, 所述参考电压的大小根据控制源输出的控制信号的最大电压 值、 最小电压值及最小占空比计算得到;
其中, 当控制源输出的控制信号为最小占空比时, 所述参考电压的大 小能使得积分器的输出电压大于 0V;
其中, 所述比较器还具有: 第二电源引脚及第二接地引脚, 该第二电 源 )脚及第二接地引脚用于外接比较器的工作电源; 其中, 所述比较器型号为 LM324;
其中, 所述场效应晶体管具有: 栅极、 源极及漏极, 所述步骤 300 中 将所述栅极与第一输出端电性连接, 将所述源极连接至地线, 将所述漏极 与 LED驱动芯片的高压开关引脚电性连接;
其中, 所述场效应晶体管为 N沟道型场效应晶体管;
其中, 所述 LED 驱动芯片还具有数个输出引脚, 该数个输出引脚用 于分别连接 LED灯;
其中, 所述 LED驱动芯片的输出引脚的数量为 6个;
其中, 所述 LED驱动芯片型号为 TLC5941、 MBI5028及 ST2221C。
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CN103929848B (zh) * 2014-05-08 2019-04-05 深圳怡化电脑股份有限公司 一种光电传感器的发射端驱动电路
CN108257548A (zh) * 2018-02-13 2018-07-06 辽宁科技大学 一种物联网控制户外led显示屏的方法及户外led显示屏
CN110351924B (zh) * 2019-06-11 2021-11-23 浙江阳光照明灯具有限公司 一种低待机功耗的led驱动电路
CN111367398B (zh) * 2020-02-28 2022-05-31 Oppo(重庆)智能科技有限公司 一种熄屏显示控制方法、装置及计算机可读存储介质
CN113724646B (zh) * 2021-09-01 2022-02-11 北京芯格诺微电子有限公司 用于led显示屏的驱动控制方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5955909A (en) * 1996-09-30 1999-09-21 Siemens Aktiengesellschaft Device for monitoring chip temperature
CN201234390Y (zh) * 2008-07-18 2009-05-06 金诗电子技术(上海)有限公司 高调光比led驱动芯片
CN102082500A (zh) * 2010-11-19 2011-06-01 北京中科可来博电子技术有限公司 Gfl107关机自动断电控制系统专用集成芯片
CN202487119U (zh) * 2012-03-14 2012-10-10 无锡聚润光电电器有限公司 公交车上运行信息的显示装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2582297Y (zh) * 2002-11-29 2003-10-22 青岛海信电器股份有限公司 液晶电视机的低功耗待机电路
KR20080102744A (ko) * 2007-05-22 2008-11-26 엘지전자 주식회사 영상기기의 전원 관리 방법 및 그 영상기기
US8350488B2 (en) 2009-06-30 2013-01-08 Microsemi Corporation Integrated backlight control system
US20120019158A1 (en) 2010-07-22 2012-01-26 Chiccony Power Technology Co., Ltd. Polarity-reversible dimming controller having function of switching light source
TWI417713B (zh) * 2010-12-23 2013-12-01 Au Optronics Corp 電子裝置的待機喚醒電路
CN102256087B (zh) * 2011-07-12 2016-09-07 青岛海信电器股份有限公司 一种低功耗待机电路及电视机

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5955909A (en) * 1996-09-30 1999-09-21 Siemens Aktiengesellschaft Device for monitoring chip temperature
CN201234390Y (zh) * 2008-07-18 2009-05-06 金诗电子技术(上海)有限公司 高调光比led驱动芯片
CN102082500A (zh) * 2010-11-19 2011-06-01 北京中科可来博电子技术有限公司 Gfl107关机自动断电控制系统专用集成芯片
CN202487119U (zh) * 2012-03-14 2012-10-10 无锡聚润光电电器有限公司 公交车上运行信息的显示装置

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