CN101179891B - LED back light source brightness control device - Google Patents

LED back light source brightness control device Download PDF

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

The invention relates to a brightness control device of LED backlight source, which includes: a control device which is used for carrying out an analysis and calculation according to the collected LCD TV video signals and generating control signals, and a backlight driving device which is connected with the control device and is used for regulating the brightness of the LED backlight source according to corresponding driving current generated by the control signal. By setting the control device and the backlight driving device, the invention causes the backlight source to form an interval working mode, thereby not only realizing the target of regulating the brightness of the backlight, but also reducing the energy consumption and heat of the backlight source and prolonging the service life. The invention has the advantages of a simple structure, a low cost and being easy to be realized; besides, the energy consumption is saved under the precondition that the display quality is guaranteed.

Description

LED背光源亮度控制装置技术领域 LED backlight luminance control apparatus Technical Field

[0001] 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。 [0001] The present invention relates to apparatus for controlling the backlight, in particular an LED backlight luminance control apparatus. 背景技术 Background technique

[0002] 目前,液晶显示器(Liquid Crystal Display,简称IXD)大都采用冷阴极荧光灯管(Cold Cathode Fluorescent Lamp,简称CCFL)作为背光源。 [0002] Currently, a liquid crystal display (Liquid Crystal Display, referred IXD) mostly using CCFL (Cold Cathode Fluorescent Lamp, referred to as 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 .

[0003] 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。 [0003] 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.

[0004] 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。 [0004] The conventional LED backlight simply a direct replacement for the original CCFL backlight 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

[0005] 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。 [0005] The 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.

[0006] 为了实现上述目的,本发明提供了一种LED背光源亮度控制装置,包括: [0006] To achieve the above object, the present invention provides an LED backlight luminance control apparatus, comprising:

[0007] 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; [0007] The control means: means for generating a control signal based on the video signal acquired LCD television;

[0008] 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。 [0008] The backlight driving means, connected to said control means for adjusting the LED luminance signal in accordance with the backlight control.

[0009] 所述控制装置包括:信号采集模块,用于采集所述IXD电视的视频信号;信号处理模块,与所述信号采集模块相连,用于对整个屏幕进行分区,根据每个区域的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。 [0009] The control apparatus comprising: a signal acquisition module, for collecting the video signal IXD television; a signal processing module, connected to the signal acquisition module, configured to partition the entire screen, the video of each zone signal analysis and processing, and outputs the processing result; signal control module, connected with the signal processing module, for generating a control signal according to the processing result, and outputs the backlight driving means.

[0010] 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。 [0010] The backlight driving means comprises a plurality of parallel-connected backlight driving circuit, each of the backlight driving circuit comprises: LED lamp set, to provide a light source; transistor, whose base is connected to the signal control module, a collector and an emitter connected 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.

[0011] 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。 [0011] The present invention provides an LED backlight luminance control apparatus, resulting in a large power consumption, heat dissipation and the need to configure additional defect prior art LED devices for the operating mode, by setting the backlight control means and drive means, the backlight source to form a discontinuous mode of operation, 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.

[0012] 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。 [0012] The following drawings and embodiments, detailed description of the further aspect of the present invention.

[0013] 附图说明 [0013] BRIEF DESCRIPTION OF DRAWINGS

[0014] 图1为本发明LED背光源亮度控制装置原理示意图; [0014] Figure 1 is a schematic view of the invention the LED backlight luminance control principle of the device;

[0015] 图2为本发明背光驱动装置电路图。 [0015] Fig 2 a circuit diagram of a backlight driving apparatus of the present invention.

[0016] 具体实施方式 [0016] DETAILED DESCRIPTION

[0017] 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。 [0017] 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 2 drive device, wherein the control means 1 for generating a control signal based on the video signal acquired LCD television; a backlight driving device 2 is connected to a control device for adjusting the brightness of the LED backlight according to a control signal.

[0018] 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。 [0018] 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.

[0019] 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。 [0019] wherein the backlight driving device 2 includes a plurality of backlight driver circuits are 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 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.

[0020] 在本实施例中,信号采集模块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。 [0020] In the present embodiment, the signal acquisition module 11 at a frequency acquisition LCD TV entire video screen image, and then transmitted to the signal processing module 12, 12 the image of the entire screen according to the region size LED backlight, the signal processing module partition (typically divided into several regions), then extracts a video signal for each region of the pixel region of the brightness parameter, the calculated value of the drive signal voltage of the pixel region based on the luminance parameter of the pixel region, and then in accordance with the size of the voltage values ​​are 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. 信号处理模块12根据获得的电压值计算出与该电压值对应的LED灯组21的驱动电流值,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。 The signal processing module 12 calculates the voltage value obtained by the LED lamp set drive current value 21 to the voltage corresponding to the value, by comparing the calculation result with the previous time flowing through LED lamp set current value of the driving current 21 may be a draw ratio, 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.

[0021] 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。 [0021] In the aspect of the present invention, the backlight driving circuit may have a configuration in the form of 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背光源的能耗比较大。 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 overall energy consumption of the LED backlight is relatively large.

[0022] 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13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。 [0022] In this embodiment, if the LED drive current needs to set too large in the present embodiment, the control module and the signal output from the control signal 13 is relatively weak, it is possible to use two or more transistors form a compound transistor, a composite transistor pair drive current of the LED lamps can be adjusted.

[0023] 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。 [0023] As can be seen from the above technical solutions, the invention since the adjustment of the LED backlight mode, the present mode is changed from a continuously open mode intermittent turn, reduces the operating time of the LED lamp, the LED backlight while reducing energy consumption, on the other hand to extend 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.

[0024] 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。 [0024] The invention has simple structure, low cost, easy to implement, to ensure the display quality in the premise, energy savings.

[0025] 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。 [0025] Finally, it should be noted that: the above embodiments are intended to illustrate the present invention, rather than limiting;. Although the present invention has been described in detail embodiments, those of ordinary skill in the art should be understood: Examples which may still aspect of the described embodiment 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 (3)

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; 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,用于对整个屏幕进行分区,根据每个区域的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。 An LED backlight luminance control apparatus, characterized by comprising: control means: 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; said control means comprising: a signal acquisition module, for collecting the video signal for LCD TVs; signal processing module, connected to the signal acquisition module, configured to partition the entire screen , according to the video signal analysis process for each area, and outputs the processing result; signal control module, connected with the signal processing module, for generating a control signal according to the processing result, and outputs the backlight driving means.
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 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.
3.根据权利要求2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 2 of the control device, wherein the 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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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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1804697A (en) 2004-12-03 2006-07-19 矽感成像有限公司 Back light system of panel type LCD

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1804697A (en) 2004-12-03 2006-07-19 矽感成像有限公司 Back light system of panel type LCD

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP特开2004-246117A 2004.09.02

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