CN101179891A - LED back light source brightness control device - Google Patents

LED back light source brightness control device Download PDF

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CN101179891A
CN101179891A CN 200710176684 CN200710176684A CN101179891A CN 101179891 A CN101179891 A CN 101179891A CN 200710176684 CN200710176684 CN 200710176684 CN 200710176684 A CN200710176684 A CN 200710176684A CN 101179891 A CN101179891 A CN 101179891A
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backlight
signal
led
control
connected
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CN101179891B (en
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刘敬伟
张凯亮
刚 王
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京东方科技集团股份有限公司
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Abstract

本发明涉及一种LED背光源亮度控制装置,包括:控制装置,用于根据所采集的LCD电视的视频信号进行分析计算,生成控制信号;背光驱动装置,与所述控制装置相连,用于根据所述控制信号产生相应的驱动电流调节LED背光源的亮度。 The present invention relates to an LED backlight luminance control apparatus comprising: control means for analyzing the video signal calculated based on the acquired LCD TVs, generates a control signal; backlight driving means, connected to said control means for generating a control signal corresponding to the driving current adjusting brightness LED backlight. 本发明通过设置控制装置和背光驱动装置,使背光源形成一种间断工作方式,不仅达到控制背光源亮度的目的,而且降低了背光源的能耗和热量,延长了使用寿命。 The present invention, by providing a backlight control means and drive means, the backlight to form a discontinuous mode of operation, not only to achieve the purpose of controlling backlight luminance, but also reduces power consumption and heat of the backlight, extended service life. 本发明结构简单、成本低、易于实现,在保证显示品质的前提下,节省能耗。 The present invention is of simple structure, low cost, easy to implement, displayed at a guaranteed quality, save energy.

Description

LED背光源亮度控制装置 LED backlight luminance control apparatus

技术领域 FIELD

本发明涉及一种控制背光源的装置,尤其是一种LED背光源亮度控制装置。 The present invention relates to apparatus for controlling the backlight, in particular an LED backlight luminance control apparatus.

背景技术 Background technique

目前,液晶显示器(Liquid Crystal Display,简称LCD)大都采用冷阴极萸光灯管(Cold Cathode Fluorescent Lamp,筒称CCFL)作为背光源。 Currently, liquid crystal display (Liquid Crystal Display, referred to as LCD) dogwood mostly cold cathode-ray tubes (Cold Cathode Fluorescent Lamp, said cylindrical CCFL) as the backlight. CCFL技术已经比较成熟,但还是存在很多缺点,如CCFL可以达到的色域较小,即电视的色彩表现范围较小;另外CCFL是用汞气体(水银蒸气) 来发光,不符合未来环保的要求。 CCFL technology is relatively mature, but still has many disadvantages, such as the CCFL can achieve a smaller color gamut, i.e., smaller color range TV; CCFL additional gas is mercury (mercury vapor) to emit light, does not comply with future environmental requirements .

而发光二极管(Light Emitting Diode,简称LED)作为一种节能、 环保的新型光源,与CCFL相比具有很多优点。 And a light emitting diode (Light Emitting Diode, referred to as LED) as an energy saving, environmental protection, new light source, compared to CCFL has many advantages. 以LED作为LCD电视的背光源, 能够使LCD电视得到更高的对比度、亮度和色彩还原性。 LED as a backlight of LCD TV, LCD TV enables higher contrast, brightness and color reproduction. 而且LED是一种半导体固体光源,不含任何有毒物质。 And the LED is a semiconductor solid-state light source does not contain any toxic substances. LED作为环保光源,正逐步代替传统的CCFL光源。 As the green light LED, CCFL is gradually replace traditional light sources.

现有LED背光源只是简单的在原有电路上直接代替CCFL背光源,仍采用连续发光的工作模式。 Simply conventional LED backlight CCFL backlight place directly in the original circuit, still emitting a continuous operating mode. 这种模式使得背光源的能耗和发热量都很大,还需要配置相应的散热装置。 This model makes the backlight power consumption and heat generation are large, but also need to configure the heat sink. 事实上,很多场合(如需要显示黑屏时)完全可以关闭背光源,当显示画面比较暗时,背光源亮度也可以降低。 In fact, many situations (e.g., when a black screen to be displayed) can turn off the backlight when the display screen is relatively dark, the backlight luminance can be reduced.

发明内容 SUMMARY

本发明的目的是提供一种LED背光源亮度控制装置,有效解决LED背光源现有连续发光工作模式导致能耗和发热量大的技术缺陷。 Object of the present invention is to provide an LED backlight luminance control means, effective solution to conventional LED backlight emitting continuous mode of operation results in greater power consumption and heat generation technical drawbacks.

括: include:

控制装置,用于根据所采集的LCD电视的视频信号生成控制信号; 背光驱动装置,与所述控制装置相连,用于根据所述控制信号调节LED 背光源的亮度。 Control means generating a control signal for a video signal acquired according to LCD TVs; backlight driving means, coupled to said control means, according to said control signal for adjusting the brightness of the LED backlight.

所述控制装置包括:信号采集模块,用于采集所述LCD电视的视频信号;信号处理模块,与所述信号采集模块相连,用于对所述视频信号进行分析处理,并将处理结果输出;信号控制模块,与所述信号处理模块相连, 用于根据所述处理结果生成控制信号,并向所述背光驱动装置输出。 Said control means comprising: a signal acquisition module, the LCD television video signal for acquisition; signal processing module, connected to the signal acquisition module, configured to analyze and process said video signal, and outputs the processing result; signal control module, with the signal processing module, for generating a control signal according to the processing result, and outputs the backlight driving means.

所述背光驱动装置包括数个并联连接的背光驱动电路,每个背光驱动电路包括:LED灯组,用于提供光源;三极管,其基极与所述信号控制模块连接,其集电极和发射极与所述LED灯组串接,用于根据所述控制信号控制所述LED灯组的开启或关闭。 The backlight driving apparatus includes a backlight driving a plurality of parallel-connected circuits, each backlight driving circuit comprises: LED lamp set, to provide a light source; transistor, whose base is connected to the signal control module, and its collector emitter in series with the LED light group for opening said control signal according to the LED lamp set on or off. 所述LED灯组包括数个串联连接的LED 灯。 The LED lamp set comprising a plurality of LED lamps are connected in series.

本发明提供一种LED背光源亮度控制装置,针对现有技术LED工作模式导致能耗大、发热量大以及需要配置额外散热装置等缺陷,通过设置控制装置和背光驱动装置,使背光源形成一种间断工作方式,不仅达到控制背光源亮度的目的,而且降低了背光源的能耗,延长了使用寿命,进一步还可以减少相应的散热装置,降低成本。 The present invention provides an LED backlight luminance control apparatus, resulting in a large energy consumption for the prior art LED mode of operation, heat dissipation means and the need to configure additional defects, by providing a backlight control means and drive means, a backlight is formed species intermittent work, not only to achieve the purpose of controlling backlight luminance, but also reduces the power consumption of the backlight, extend the life, and may further reduce the respective heat sink, reducing the cost. 本发明结构简单、成本低、易于实现,在保证显示品质的前提下,节省能耗。 The present invention is of simple structure, low cost, easy to implement, displayed at a guaranteed quality, save energy.

下面通过附图和实施例,对本发明的技术方案做进一步的详细描述。 The following drawings and embodiments, detailed description of the further aspect of the present invention.

附图说明 BRIEF DESCRIPTION

图1为本发明LED背光源亮度控制装置原理示意图; 图2为本发明背光驱动装置电路图。 1 a schematic view of the principle of the LED backlight device of the present invention, brightness control; Fig 2 a circuit diagram of the present invention, the backlight driving device.

具体实施方式 Detailed ways

图1为本发明LED背光源亮度控制装置原理示意图,图2为本发明背光驱动装置电路图,如图1、图2所示,本发明LED背光源亮度控制装置包括控制装置1和背光驱动装置2,其中控制装置1用于根据所采集的LCD电视的视频信号产生控制信号;背光驱动装置2与控制装置1相连,用于根据控制信号调节LED背光源的亮度。 Figure 1 is a schematic view of the principle of the invention means the LED backlight brightness control circuit diagram of the backlight driving apparatus of the present invention, FIG. 2, FIG. 1, FIG. 2, the present invention is the LED backlight brightness control means comprises a control means 1 and the backlight driving apparatus 2 wherein the control apparatus 1 according to a video signal for LCD TVs collected generating a control signal; backlight driving unit 2 is connected to a control device for adjusting the brightness of the LED backlight in accordance with the control signal.

具体地,控制装置1包括信号采集模块11、信号处理模块12和信号控制模块13。 Specifically, the control apparatus 1 comprises a signal acquisition module 11, the signal processing module 12 and a signal control module 13. 信号采集模块11用于采集LCD电视的视频信号,信号处理模块12与信号采集模块11相连接,用于对采集到的视频信号进行分析和处理,并将处理结果输出给信号控制模块13;信号控制模块13与信号处理模块12相连接,接收信号处理模块12的分析处理结果并根据该结果产生控制信号,并输出给背光驱动装置2。 Video signal acquisition module 11 for acquiring LCD TV signal processing module 12 and 11 is connected to the signal acquisition module, for collecting the video signal analysis and processing, and outputs the result to the signal processing control module 13; signal the control module 1312 is connected to the signal processing module, the processing module analyzes the reception signal processing result 12 and generates control signals based on the result, and outputs it to the backlight driving unit 2.

其中,背光驱动装置2包括数个并联连接的背光驱动电路,每个背光驱动电路包括LED灯组21和三极管22,每个LED灯组21由多个LED灯串联组成,用于向液晶显示器件提供光源,每个LED灯组21与三极管22串接, 组成一个背光驱动电路,多个背光驱动电路并联组成背光驱动装置2。 Wherein the backlight driving the backlight 2 includes a plurality of driving circuit means connected in parallel, each of the backlight driving circuit 21 and the LED lamp set comprises a transistor 22, each of the LED group 21 composed of a plurality of LED lamps in series, for the liquid crystal display device providing a light source, each LED lamp group 21 and the transistor 22 connected in series to form a backlight driving circuit, the plurality of backlight driving circuit 2 connected in parallel backlight driving apparatus. 其中三极管22的基极与信号控制模块13相连,集电极和发射极串接在背光驱动电路中,三极管22由信号控制模块13输出的控制信号控制导通或关断,从而达到控制LED灯的开启和关闭的目的。 Wherein the base of the transistor 22 is connected to the signal electrode control module 13, the collector and emitter connected in series backlight driving circuit, the control transistor 22 is turned on by the control signal outputted from the signal control module 13 on or off, so as to control the LED lamp opening and closing purposes.

在本实施例中,信号釆集模块11以一定频率采集LCD电视整个屏幕图像的视频信号,然后传送给信号处理模块12,根据LED背光源的区域大小,信号处理模块12对整个屏幕图像进行分区(一般可分为几十个区域),然后对每个区域的视频信号提取出该区域像素的亮度参数,根据该区域像素的亮度参数计算出该区域像素的驱动信号电压值,再根据其电压值的大小进行处理。 In the present embodiment, the signal preclude the assembly module 11 at a frequency acquisition LCD TV entire video screen image, and then transmitted to the signal processing module 12, 12 to partition the entire screen image based on region size, the signal processing module LED backlight (typically divided into dozens of regions), and the video signal for each region of the extracted region pixel brightness parameter is calculated drive signal voltage value according to the brightness of the area of ​​the pixel area of ​​the pixel parameters, and then in accordance with the voltage size value is processed. 当屏幕图像比较亮时,区域像素的亮度参数较大,其驱动信号的电压值也比较大,这时就需要LED灯比较亮,即流过LED灯组21的驱动电流比较大。 When the screen image is brighter, the brightness of a large area of ​​the pixel parameter, the voltage value of the driving signal is relatively large, requiring relatively bright LED light, i.e., flows through the LED lamps 21 relatively large driving current. 信号处理;漠块12才艮据获得的电压值计算出与该电压值对应的LED灯組21的驱 The signal processing; desert Gen block 12 according to a voltage value obtained was calculated from the voltage value corresponding to the LED lamps 21 are driven

动电流值,通过将这个计算结果与上一时刻流过LED灯组21的驱动电流的电流值比较,可得出一个比值,然后将这个比值输出到信号控制模块13。 Up current value, the calculation result by the LED lamp flows through a timing comparator, a current value of the driving current can be drawn from the ratio of a group 21, and then outputs the signal to the control module 13 ratio. 信号控制模块13将该比值作为占空比产生相应波形的控制信号,如当比值为80 时,信号控制模块13则产生占空比为80%的控制信号,即控制信号的高电平占80%,低电平占20%,信号控制模块13将产生的该控制信号由输出端口输出给三极管22,三极管22根据控制信号完成导通或关断动作,使背光驱动电路中产生相应的驱动电流,并使得LED灯组21以设定的占空比开启或关断, 通过调节LED灯组21的开启和关断时间,从而控制背光源的亮度。 A control signal the ratio control module 13 generates a corresponding waveform duty ratio, such as when the ratio is 80, the signal control module 13 generates a control signal of a duty ratio of 80%, i.e., the control signal takes the high level 80 %, 20% low-level, the control module 13 control signals generated by the output port to the transistor 22, transistor 22 is turned on or off to complete the operation according to a control signal, the backlight driving circuit generates a driving current corresponding , and so that the LED lamps 21 to set the duty ratio to turn on or off, by adjusting the LED group 21 is turned on and off time, thereby controlling the luminance of the backlight.

在本发明技术方案中,背光驱动电路也可以采用LED灯组并联三极管的结构形式,多个背光驱动电路再并联组成背光驱动装置。 In the aspect of the present invention, the backlight driving circuit may be employed structure LED lamp set of transistors in parallel, the plurality of backlight driving circuit connected in parallel and then the backlight driving unit. 但是在LED灯组关闭时,LED灯组并联三极管的方式使得电能都消耗在三极管上,导致整体LED However, when the LED lamp set off, the LED set in parallel manner such that the power transistors are consumed in the transistor, resulting in an overall LED

背光源的能耗比较大。 The energy consumption of the backlight is relatively large.

在本实施例中,如果LED灯组需要的驱动电流太大,而信号控制模块l3 输出的控制信号相对比较弱,则可以采用两个或多个三极管组成复合三极管, 通过复合三极管对LED灯组的驱动电流进行调节。 In the present embodiment, if the LED drive current needs group is too large, and the control signal outputted from the control module l3 is relatively weak, it is possible to use two or more transistors form a compound transistor, a composite transistor of the LED lamp set drive current is adjusted.

从上述技术方案可以看出,本发明由于调整了LED背光源的工作模式, 从持续开启模式改变为间断开启模式,减少了LED灯的工作时间, 一方面降低了LED背光源的能耗,另一方面延长了LED背光源的使用寿命。 As can be seen from the above technical solutions, the present invention since the adjustment of the operating modes of the LED backlight to change from the discontinuous mode to the continuous turn-on mode, reducing the working time of the LED lamp, while reducing the power consumption of the backlight LED, other in one aspect prolong the service life of the LED backlight. 而且,由于LED背光源的响应速度非常快,在其关闭的短暂时间内可以将热量尽快散发出来,由此可以减少相应的散热装置,降低了成本。 Further, since the response speed is very fast LED backlight, in its closed short time heat can be distributed out as soon as possible, thereby reducing the respective heat sink, reducing the cost.

本发明结构简单、A科氐、易于实现,在保证显示品质的前提下,节省能耗。 The present invention is of simple structure, A Division Di, easy to implement, to ensure the display quality in the premise, energy savings.

最后应说明的是:以上实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明实施例技术方案的精神和范围。 Finally, it should be noted that: the above embodiments are intended to illustrate the present invention, rather than limiting;. Although the embodiments of the present invention has been described in detail, those of ordinary skill in the art should be understood: that they may still technical solutions described in the foregoing embodiments may be modified, or some technical features equivalents; as such modifications or replacements do not cause the essence of corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (4)

1.一种LED背光源亮度控制装置,其特征在于,包括: 控制装置,用于根据所采集的LCD电视的视频信号生成控制信号; 背光驱动装置,与所述控制装置相连,用于根据所述控制信号调节LED背光源的亮度。 An LED backlight luminance control apparatus, characterized by comprising: control means for generating a control signal in accordance with a video signal acquired LCD television; a backlight drive means, connected to said control means, according to the said control signal to adjust the brightness of the LED backlight.
2. 根据权利要求1所述的LED背光源亮度控制装置,其特征在于,所述控制装置包括:信号采集模块,用于采集所述LCD电视的视频信号; 信号处理模块,与所述信号采集模块相连,用于对所述视频信号进行分析处理,并将处理结果输出;信号控制模块,与所述信号处理模块相连,用于根据所述处理结果生成控制信号,并向所述背光驱动装置输出。 2. LED backlight luminance control apparatus according to claim 1, wherein, said control means comprising: a signal acquisition module, for collecting the video signal for LCD TVs; signal processing module, said signal acquisition module is connected to the video signal analysis and processing, and outputs the processing result; signal control module, with the signal processing module, for generating a control signal according to the processing result, to the backlight drive means output.
3. 根据权利要求1所述的LED背光源亮度控制装置,其特征在于,所述背光驱动装置包括数个并联连接的背光驱动电路,每个背光驱动电路包括:LED灯组,用于提供光源;三极管,其基极与所述信号控制模块连接,其集电极和发射极与所述LED灯组串接,用于根据所述控制信号控制所述LED灯组的开启或关闭。 3. The LED backlight luminance control apparatus according to claim 1, wherein said backlight driving means comprises a plurality of backlight driving circuit connected in parallel, each of the backlight driving circuit comprises: LED lamp set, a light source for providing ; transistor, whose base is connected to the signal control module, an emitter, and a collector connected in series with the LED light group for opening said control signal according to the LED lamp set on or off.
4. 根据权利要求3所述的LED背光源亮度控制装置,其特征在于,所述LED灯组包括数个串联连接的LED灯。 LED backlight luminance according to claim 3, said control means, wherein said LED lamp set comprising a plurality of LED lamps are connected in series.
CN 200710176684 2007-11-01 2007-11-01 LED back light source brightness control device CN101179891B (en)

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CN102348084A (en) * 2010-07-29 2012-02-08 Tcl集团股份有限公司 Television system and method for reducing power consumption of the television without signal
WO2013174119A1 (en) * 2012-05-25 2013-11-28 京东方科技集团股份有限公司 Backlight module and display device
CN103886840A (en) * 2014-03-05 2014-06-25 美的集团股份有限公司 Display screen brightness control device, air conditioner and method for controlling display screen brightness
CN105405412A (en) * 2015-12-23 2016-03-16 深圳Tcl新技术有限公司 Backlight driving control method and system
CN106128391A (en) * 2016-08-29 2016-11-16 合肥惠科金扬科技有限公司 A kind of LCD backlight module with brightness impression regulation

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US7324080B1 (en) 2004-12-03 2008-01-29 Sysview Technology, Inc. Backlighting in liquid crystal flat panel display

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102348084A (en) * 2010-07-29 2012-02-08 Tcl集团股份有限公司 Television system and method for reducing power consumption of the television without signal
WO2013174119A1 (en) * 2012-05-25 2013-11-28 京东方科技集团股份有限公司 Backlight module and display device
CN103886840A (en) * 2014-03-05 2014-06-25 美的集团股份有限公司 Display screen brightness control device, air conditioner and method for controlling display screen brightness
CN103886840B (en) * 2014-03-05 2016-08-31 美的集团股份有限公司 Brightness of display screen controls device, air-conditioning and luminance control method for display screen
CN105405412A (en) * 2015-12-23 2016-03-16 深圳Tcl新技术有限公司 Backlight driving control method and system
WO2017107387A1 (en) * 2015-12-23 2017-06-29 深圳Tcl新技术有限公司 Backlight driver control method and system
CN106128391A (en) * 2016-08-29 2016-11-16 合肥惠科金扬科技有限公司 A kind of LCD backlight module with brightness impression regulation

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