CN100578594C - Driving circuit for backlight module and the display panel with the same - Google Patents

Driving circuit for backlight module and the display panel with the same Download PDF

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CN100578594C
CN100578594C CN 200610058697 CN200610058697A CN100578594C CN 100578594 C CN100578594 C CN 100578594C CN 200610058697 CN200610058697 CN 200610058697 CN 200610058697 A CN200610058697 A CN 200610058697A CN 100578594 C CN100578594 C CN 100578594C
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backlight
plurality
transformer
voltage
driving
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CN 200610058697
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Chinese (zh)
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CN101034533A (en
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张书铭
梁胜尧
白双喜
黄裕培
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奇景光电股份有限公司
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Abstract

The invention relates to a backlight driving module for lighting multiple backlight blocks of a backlight module in a LCD panel. And the driving circuit comprises a converter, at least a transformer and multiple switch components, where the converter is used to convert a DC voltage into an AC voltage for outputting, the primary side of the transformer is used to receive the AC voltage from the converter and the transformer uses the secondary side to generate the driving voltage to light the backlight blocks; a switch component is arranged between each backlight block and the secondary side of the transformer to determine whether the transformer-outputted driving voltage at one end of the switch component can light the backlight block at the other end of the switch component. And the invention can improve dynamic picture quality, and reduce number of components, and has features of smaller volume, lower weight, and able to save electric energy.

Description

一种背光模块驱动电路及具有该驱动电路的显示面板 A backlight module having a display panel and a driving circuit of the driving circuit

技术领域 FIELD

本发明涉及一种驱动电路,特别是涉及一种以高频交流电流点亮显示面板的背光模块的驱动电路。 The present invention relates to a drive circuit, particularly to a drive circuit for a display panel lit backlight module to high frequency alternating current.

背景技术 Background technique

近年来光电相关技术不断地推陈出新,各种电子装置的数字化趋势,扩大了显示器的技术层次以及应用范围,使得常见的显示器种类从以往的阴极射线 Related Art In recent years, photoelectric moves forward, the trend of various digital electronic devices, technical level and expand the range of applications of the display, such a display type from the common conventional cathode ray

管(Cathode Ray Tube, CRT)显示器,又增加了使用液晶显示面板的液晶显示器以及使用等离子显示面板的等离子显示器等等。 Tube (Cathode Ray Tube, CRT) displays, increased use of liquid crystal display panel using a liquid crystal display and a plasma display panel, a plasma display or the like. 其中由于这些液晶显示器相较其它显示器在显示原理上有很大的不同,所以能够轻易地达到高画质、体积小、重量轻、驱动电压低以及消耗功率低等优点,更加地适用于个人数字助理(personal digital assistant, PDA)、移动电话、摄录放影机、笔记本计算机、电视等消费性通讯及电子产品上,因此,液晶显示器有逐渐取代阴极射线管显示器而成为显示器主流的趋势。 Since the liquid crystal display device wherein the display compared to other displays on the principle there is very different, it is possible to easily achieve high quality, small size, light weight, and low driving voltage and low power consumption, more applicable to personal digital the assistant (personal digital assistant, PDA), mobile phones, camcorders, notebook computers, televisions and other consumer electronics and communications products, therefore, liquid crystal displays have gradually replaced cathode ray tube display monitors become mainstream trend.

但由于液晶显示器是属于非自体发光的显示装置,因此需要有其它的辅助光源来协助其显示影像,也就是一般所称的背光源。 However, since the liquid crystal display is part of a non-self light emitting display device, and thus the need for further auxiliary light source to assist image display, which is generally called backlight. 由于目前液晶显示器的发展趋势是朝向大尺寸发展,所以常使用冷阴极灯管(cold cathode fluorescent lamp)来做为大尺寸液晶显示器的背光源,因为冷阴极管具有管径细、光度强、 Since the current trend is toward the liquid crystal display of large-size development, it is often used CCFL (cold cathode fluorescent lamp) do for large-size liquid crystal display backlight, since the cold-cathode tube having a tube diameter, a strong luminosity,

发光面积广以及低损耗等优点。 Wide light-emitting area and low loss advantages.

图1图示了一液晶显示器100的部分示意图,液晶显示器100包含了用以显示画面的一像素数组102以及背光模块104。 FIG 1 illustrates a schematic view of a portion of the liquid crystal display 100, liquid crystal display 100 comprises a pixel array for the display screen 102 and a backlight module 104. 通常像素数组102及背光模块104是重叠在一起的,但为方便说明起见,在示意图100中将像素数组102及背光模块104分别设置。 Typically the pixel array 102 and a backlight module 104 are overlapped together, but for convenience of explanation, a schematic view of the pixel array are disposed and a backlight module 102 will be 104,100. 其中像素数组102当中包含了多个像素结构,而背光模块104当中包含了多个平行配置的冷阴极管106。 Wherein the pixel array 102 which comprises a plurality of pixel structures, and the backlight module 104 which comprises a cold cathode tube 106 is a plurality of parallel arranged.

目前为了改善动态画面的品质,常会使用扫描式背光(scan backlight) 控制模式来显示画面。 Currently, to improve the quality of moving pictures, often using a scanning backlight (scan backlight) control mode display. 其中,整个像素数组102会被区分为如图所示的多个显示区块,即显示区块102a-102d,相对地,整个背光模块104也会被区分为位置与显示区块相对应的多个背光区块,即背光区块104a-104d,其中每一背光区块中会包含至少一个冷阴极管106。 Wherein the entire pixel array 102 is divided into a plurality of display blocks shown in FIG area, i.e. the display area 102a-102d, relatively, the entire backlight module 104 will be distinguished as a position corresponding to the multi display block of backlight blocks, i.e., a backlight blocks 104a-104d, wherein each of the backlight blocks will comprise at least one cold cathode tube 106. 此时,在扫描式背光控制模式下,会依据一定的顺序对显示区块102a-102d充电。 In this case, the scanning backlight control mode, charging the display area 102a-102d according to a certain sequence. 在依序充电显示区块102a-102d 的同时,也会依枏同的顺序点亮对应于显示区块102a-102d的背光区块104a-104d,以显示一完整的影像画面。 In sequential charging display tile 102a-102d at the same time, also in accordance with the order of nan lighting block corresponding to the display tile 102a-102d of the backlight 104a-104d, in order to display a full screen image.

如此,背光模块104中所有的冷阴极管106不再是同时被点亮以及关闭, 而是以区块为单位来进行点亮与关闭的动作,而背光驱动单元的数量也会因为背光区块的增加而增加。 Thus, all of the backlight module 104 is no longer the cold cathode tube 106 is lit and turned off simultaneously, but in units of blocks to the lighting on and off operation, but the number of backlight drive units will be because the backlight blocks the increases. 图2所示即为配合图1所示的背光模块104所使用的驱动电路200,其中可以看出背光区块104a是由换流器204a及变压器206a 所驱动、背光区块104b是由换流器204b及变压器206b所驱动、背光区块K)4c 是由换流器204c及变压器206c所驱动以及背光区块104d是由换流器204d 及变压器206d所驱动。 A backlight driving circuit module 104 shown in FIG. 1 was used with the Figure 2 is the 200 where it can be seen backlight block 104a is driven by the inverter transformers 204a and 206a, 104b of the backlight blocks is a stream by the transducer 206b and 204b of the transformer, the backlight block K) 4c by the inverter 204c and 206c of the transformer block and a backlight driver and transformer 206d 204d 104d is driven by the inverter. 换流器204a-204d都接受由直流电源202所提供的电能。 The inverter 204a-204d will receive power from a DC power supply 202 is provided. 在驱动电路200之下,当需要点亮其中之一背光区块时,便须启动该背光区块所对应的换流器,如欲点亮背光区块104b时便须启动换流器204b,当欲以一预定顺序点亮与关闭背光区块104a-104d时,便须以该预定顺序激活与停止换流器204a-204d。 Under the driving circuit 200, when it is desired wherein one of the lighting of the backlight blocks, the block would have to start the corresponding backlight inverter, it shall To start the inverter 204b when the backlight is lit block 104b, when trying to use a predetermined sequence of lighting off the backlight blocks 104a-104d, which will be activated in a predetermined sequence and stops the inverter 204a-204d.

'自驱动电路200的架构当中可明显地看出一些问题。 'From the driving circuit 200 architecture is evident among some problems. 如驱动单元(及换流器及变压器)的数量过多,会大大增加显示面板的重量与体积。 Too many Drive unit (and the inverter and the transformer), will greatly increase the weight and volume of the display panel. 电路架构过于复杂,每多出一背光区块便须加装一组驱动单元。 Too complicated circuit structure, each backlight block extra will have to install a set of drive units. 大量的换流器元件也会伴随着大量的开关切换动作,造成电能的损耗。 A large number of inverter elements will be accompanied by a large number of switching operation, resulting in energy loss. 这些问题都对液晶显示面板的发展造成障碍,尤其是对小尺寸的液晶显示面板而言。 These issues are an obstacle to the development of liquid crystal display panels, especially for small-sized liquid crystal display panel terms.

发明内容 SUMMARY

本发明所要解决的技术问题在于提供一种背光模块驱动电路及具有该驱动电路的显示面板,使用于液晶显示面板之中,减少元件数量,体积较小、重量较轻,可节省电能。 The present invention solves the technical problem is to provide a backlight module having a display panel and a driving circuit of the driving circuit used in the liquid crystal display panel, reducing the number of components, smaller, lighter, can save power.

为了实现上述目的,本发明提供一种背光模块驱动电路,用以分别点亮液晶显示面板中背光模块所具有的多个背光区块,此种驱动电路包含有一换流器、至少一变压器以及多个开关元件,其中,换流器用以接收一直流电源,并将此直流电源所提供的直流电压切换成交流电压后输出。 To achieve the above object, the present invention provides a backlight module driving circuit, for respectively lighting backlight module the liquid crystal display panel has a plurality of backlight blocks, such driving circuit includes a converter, a transformer and a plurality of at least switching elements, wherein after the inverter for receiving the output of DC power and DC voltage of this DC power supply is switched to provide alternating voltage. 变压器的第一次恻用以接收由换流器所输出的交流电压,并由第二次侧产生用以驱动背光区块的驱动电压。 Sad first transformer for receiving the AC voltage output by the inverter, and by generating a second drive voltage for driving the side of the backlight block. 开关元件会分别装设于每一个背光区块与变压器的第二次侧之间,用以决定此开关元件一端的变压器所输出的驱动电压能否点亮开关元件另一端的背光区块& Each switching element will be mounted between the second side of each of the backlight blocks and the transformer, this transformer for determining the output end of the switching element driving voltage lighting backlight can block the other end of the switching element &

上述背光模块驱动电路,其特点在于,该开关元件非同时被导通以及关闭。 The backlight module driving circuit, characterized in that the switching element is non-conducting and close simultaneously. 上述背光模块驱动电路,其特点在于,该换流器具有两组换流开关,通过 The backlight module driving circuit, characterized in that the inverter has two commutation switches, by

相互切换该两组换流开关可将该直流电压切换成该交流电压。 The switching between the two commutation switches route the DC voltage into the AC voltage.

上述背光模块驱动电路,其特点在于,该两组换流开关包含多个金属氧化 The backlight module driving circuit, characterized in that the two commutation switches comprising a plurality of metal oxide

物场效应管。 Was FET.

上述背光模块驱动电路,其特点在于,该开关元件为双向三端开关。 The backlight module driving circuit, characterized in that the switching element is a TRIAC. 上述背光模块驱动电路,其特点在于,还包含多个阻隔电容分别连接于该 The backlight module driving circuit, characterized in that, further comprising a plurality of blocking capacitors respectively connected to the

变压器的第一次侧及第二次侧,用以阻隔该交流电压以及该驱动电压中的直流成分。 The first side and the secondary side of the transformer, the alternating voltage, and for blocking the driving voltage of the DC component.

本发明还提供一种背光模块驱动电路,包含有一换流器、多变压器以及多个开关元件,其中,换流器用以接收一直流电源,并将此直流电源所提供的直流电压切换成交流电压后输出。 The present invention also provides a backlight module driving circuit includes a converter, a transformer and a plurality of multiple switching elements, wherein the converter for receiving DC power and DC voltage of this DC power supply into an AC voltage provided by the switching after the output. 每一变压器的第一次侧都用以接收由换流器所输出的交流电压,并能够由第二次侧输出用以一驱动背光区块的驱动电压。 Each side of both the first transformer for receiving an AC voltage by the inverter output, and a driving voltage can be used for driving the backlight block output by the second side. 每个变压器都会与一开关元件连接,此开关元件可装置于变压器的第一次侧与换流器之间或变压器的第二次侧与背光区块之间,用以决定此开关元件所连接的变压器能否输出驱动电压以点亮该变压器所连接的背光区块。 The second side of each transformer are connected to a switching element, this switching element may be in the transformer means between the first side of the converter or transformer and between the backlight blocks, for determining the switch element is connected can transformer drive voltage is output to illuminate a backlight block of the transformer is connected.

上述背光模块驱动电路,其特点在于,该开关元件分别耦接于该换流器与该变压器之间,当该开关元件被导通时,会激活该变压器输出该驱动电压点亮该背光区块。 The backlight module driving circuit, characterized in that the switching elements are coupled between the inverter and the transformer when the switching element is turned on, the output of the transformer will activate the driving voltage lighting the backlight block .

上述背光模块驱动电路,其特点在于,该开关元件分别耦接于与该变压器与该背光区块之间,当该开关元件被导通时,该变压器所输出的该驱动电压会点亮该背光区块。 The backlight module driving circuit, characterized in that the switching elements are coupled between the transformer and the backlight block and, when the switching element is turned on, the transformer output from the lighting of the backlight driving voltage blocks.

上述背光模块驱动电路,其特点在于,该开关元件非同时被导通以及关闭。 The backlight module driving circuit, characterized in that the switching element is non-conducting and close simultaneously. 上述背光模块驱动电路,其特点在于,该换流器具有两组换流开关,通过相互切换该两组换流开关可将该直流电压切换成该交流电压。 The backlight module driving circuit, characterized in that the inverter has two switches commutation, the commutation switches route the DC voltage into an AC voltage by the switching between the two groups. 上述背光模块驱动电路,其特点在于,该两组换流开关包含多个金属氧化物场效应管。 The backlight module driving circuit, characterized in that the two commutation switches comprising a plurality of metal oxide field effect transistors.

上述背光模块驱动电路,其特点在于,该开关元件为双向三端开关。 The backlight module driving circuit, characterized in that the switching element is a TRIAC. 上述背光模块驱动电路,其特点在于,还包含多个阻隔电容分别连接于该 The backlight module driving circuit, characterized in that, further comprising a plurality of blocking capacitors respectively connected to the

变压器的第一次侧及第二次侧,用以阻隔该交流电压以及驱动电压中的直流成分。 The first side and the secondary side of the transformer for blocking direct current component of the AC voltage, and driving voltage.

本发明还提供一种显示面板,其特点在于,包含: 一像素数组,包含多个显示区块; 一背光模块,包含多个背光区块,其中该背光区块的位置与该显示区块互相对应; 一背光模块驱动电路,用以点亮该背光区块,其中该背光模块驱动电路包含: 一换流器,用以将一直流电压转换为一交流电压;多个变压器, 其中每一该变压器能够将该交流电压转换为一驱动电压,其中该驱动电压供驱动该背光区块;以及多个开关元件,分别耦接于该多个变压器和该换流器之间, 用以决定是否点亮该多个背光区块,其中当该多个开关元件其中之一被导通时,该开关元件所耦接的变压器所输出的驱动电压会将该多个背光区块其中之一点亮。 The present invention further provides a display panel, characterized in that, comprising: a pixel array, comprising a plurality of display blocks; a backlight module, a backlight comprising a plurality of blocks, wherein the position of each block of the backlight of the display area corresponds; a backlight module driving circuit for lighting the backlight block, wherein the backlight module driving circuit comprising: an inverter for converting the DC voltage into an AC voltage; a plurality of transformers, wherein each of the the transformer can be an AC voltage into the driving voltage, wherein the driving voltage for driving the backlight block; and a plurality of switching elements respectively coupled between the plurality of transformers and the converter, for determining whether the point the plurality of backlight blocks light, wherein when one of the plurality of switching elements which are turned on, the switching element coupled to the transformer output voltage driving the plurality of blocks wherein one of the lighting of the backlight.

上述显示面板,其特点在于,该开关元件非同时被导通以及关闭。 The display panel, characterized in that the switching element is non-conducting and close simultaneously. 上述显示面板,其特点在于,该换流器具有两组换流开关,通过相互切换该两组换流开关可将该直流电压切换成该交流电压。 The display panel, characterized in that the inverter has two switches commutation, the commutation switches route the DC voltage into an AC voltage by the switching between the two groups.

上述显示面板,其特点在于,该两组换流开关包含多个金属氧化物场效应管。 The display panel, characterized in that the two commutation switches comprising a plurality of metal oxide field effect transistors.

上述显示面板,其特点在于,该开关元件为双向三端开关。 The display panel, characterized in that the switching element is a TRIAC.

上述显示面板,其特点在于,还包含多个阻隔电容分别连接于该变压器的第一次侧及第二次侧,用以阻隔该交流电压以及驱动电压中的直流成分。 The display panel, characterized in that, further comprising a first side and the secondary side of the plurality of blocking capacitors respectively connected to the transformer for blocking the DC component of an AC voltage and a driving voltage.

本发明的功效,在于改善动态画面品质,减少元件数量,体积较小、重量较轻,可节省电能。 The efficacy of the present invention is to improve the dynamic picture quality, reduced component count, smaller size, lighter weight, can save power.

以下结合附图和具体实施例对本发明进行详细描述,但不作为对本发明的限定。 The present invention will be described in detail in conjunction with the accompanying drawings and the specific embodiments, but not limit the present invention.

附图说明 BRIEF DESCRIPTION

图1为一般显示面板内的部分架构图;图2为使用于一般显示面板内的背光模块驱动电路架构图; 图3A为符合本发明的一实施例的背光模块驱动电路架构图; 图3B为符合本发明的一实施例的背光模块驱动电路图; 图4为符合本发明另一实施例的背光模块驱动电路架构图; 图5为符合本发明另一实施例的背光模块驱动电路架构國。 FIG. 1 is a partial schematic diagram of the general display panel; FIG. 2 is used in a backlight module in a general display panel driving circuit architecture; Figure 3A driving circuit schematic diagram of the backlight module to an embodiment consistent with the present invention; FIG. 3B is a a backlight module consistent with the present invention is a driving circuit diagram of an embodiment; FIG. 4 is a line with the backlight driving circuit module according to another embodiment of the present invention, a schematic diagram; FIG. 5 is a line with the backlight driving circuit module according to another embodiment of the present invention States architecture. 其中,附图标记: 100:显示面板 Wherein the reference numerals: 100: display panel

102a-102d:显示区块104a-i04d:背光区块202:直流电源206a-206d:变压器302:换流器306a-306d:—开关元件400:背光模块驱动电路架构 102a-102d: display area 104a-i04d: a backlight block 202: the DC power source 206a-206d: Transformer 302: inverter 306a-306d: - switching element 400: a backlight driving circuit module architecture

500:背光模块驱动电路架构Vdc:直流电源T:变压器Cl、 C2:阻隔电容 500: Vdc of the backlight module driving circuit architecture: DC power T: transformer Cl, C2: blocking capacitors

具体实施方式 Detailed ways

为了在液晶显示面板中实现扫描式背光控制模式,以达到改善动态画面品质的目的,在先前技术之中会为背光模块中的每一个背光区块都设计一组驱动单元(如换流器以及变压器),使每一组驱动单元能够个别点亮其所连接的背光区块。 In order to achieve scanning backlight control mode in the liquid crystal display panel, in order to achieve the purpose of improving the quality of a motion picture, among the prior art will be for each block of the backlight in the backlight module are designed to set a driving unit (e.g., an inverter, and transformers), each set can be individually lit backlight driving unit blocks connected to it. 但如此也会使背光模块驱动电路中的电路元件大量增加,增加了电路在体积、重量以及成本上的负担。 But also make such a backlight module driving circuit elements in the circuit large increase in the load circuit increases in size, weight and cost. 因此本发明的基本概念便是共同使用较少数量的驱动单元来点亮较多数量的背光区块,其中是利用开关元件的切换来决定点亮哪一个背光区块。 Thus the basic concept of the invention is to use a smaller number of common drive unit a greater number of lit backlight block, wherein the switch element is the use of a backlight to determine which blocks light.

图3A图示了符合本发明的一实施例的背光模块驱动电路架构3CK)a,其中包含了一换流器302、 一变压器304以及开关元件306a-306d。 3A illustrates a backlight module consistent with the present invention, an embodiment of the driving circuit structure 3CK) a, which contains an inverter 302, a transformer 304 and switching elements 306a-306d. 此驱动电路架构300a使用于一显示面板之中,如液晶显示面板,其作用便是用以点亮显示 This driving circuit structure 300a used in a display panel, a liquid crystal display panel for lighting the display effect is

102:像素数组 102: the pixel array

104:背光模块 104: backlight module

200:背光模块驱动电路架构 200: a backlight driving circuit module architecture

204a-204d:换流器 204a-204d: converter

300a:背光模块驱动电路架构 300a: a backlight driving circuit module architecture

304:变压器 304: Transformers

300b:背光模块驱动电路 300b: a backlight driving circuit module

402a、 402b:变压器502a-502d:变压器S1-S4:换流开关M1-M4:双向三端开关面板之中的背光模块,并且是能够以个别点亮背光模块中的背光区块 402a, 402b: transformers 502a-502d: transformers S1-S4: commutation switches M1-M4: among TRIAC panel backlight module, and is capable of lighting the backlight block individually to the backlight module

104a-104d的方式来点亮背光模块。 104a-104d manner lighting backlight module.

一般在背光区块104a-104d中会包含多个冷阴极管作为发光源,而冷阴极管需要以交流电压作为电源,故需要利用换流器302来将由显示面板内部的直流电源202所提供的直流电压切换成交流电压后再传送给变压器304进行变压的动作,以将换流器302所输出的交流电压转变为适合点亮背光区块104a-104d用的驱动电压。 In the backlight generally will block 104a-104d includes a plurality of cold-cathode tubes as a light source, a cold cathode tube and an AC voltage as a power supply needs to be, so the need to use an inverter 302 to the inner panel by the display 202 provides DC power switching the DC voltage to an AC voltage of the transformer after transfer operation of the transformer 304, to the inverter output AC voltage 302 into a voltage suitable for driving the backlight is lit with the blocks 104a-104d.

在此由变压器304所输出的驱动电压是用以点亮背光模块中所有的背光区块(即本例中的背光区块104a-104d)所使用的,也就是说使用一组驱动单元(即本例中的换流器302及变压器304)即可点亮所有的背光区块,大大地节省了驱动单元的数量。 The output 304 from the transformer drive voltage is used all the blocks of the backlight is lit backlight module (i.e., the backlight block according to the present embodiment 104a-104d) is used, that is to say the use of a plurality of drive units (i.e. the inverter transformers 302 and 304) of the present embodiment can light up all the blocks of the backlight, significantly saving on the number of the drive unit. 但是在扫描式背光控制模式下,每个背光模块都不一定会同时点亮与关闭,—因此在本实施例中,—利用了开关元件306&二30—6d来个别控制背光区块104a-104d的点亮与关闭。 However, in the backlight control mode scanning, each backlight module will not necessarily simultaneously lit and closed, - in the present embodiment, therefore, - a switch device 306 to individual control & 30-6d two backlight blocks 104a-104d lighting on and off. 开关元件306a-306d分别装置在背光区块104a-104d与变压器304之间。 Switching elements 306a-306d, respectively, means between the backlight blocks 104a-104d of the transformer 304. 以开关元件306a为例,开关元件306a的两端分别连接了变压器304与背光区块104a,当需要点亮背光区块104a吋便导通开关元件306a即可,如此变压器304所输出的驱动电压便会将背光区块104a 点亮。 A switching element 306a, for example, across the switching element 306a of the transformer 304 and the backlight are connected to the blocks 104a, 104a blocks the backlight is lit when it is necessary it inch 306a to turn on the switching element, so the output transformer driving voltage 304 the backlight 104a will block light. 同理,开关元件306b-306d分别控制着背光区块104b-104d的点亮与关闭。 Similarly, the switching elements 306b-306d, respectively, the backlight control block 104b-104d and off lighting.

图3B图示了在本实施例中用以实现图3A所示架构300a的背光模块驱动电路300b。 3B illustrates for realizing the present embodiment in FIG. 3A embodiment shown the architecture of the backlight module driving circuit 300a 300b. 同时参阅图3A及3B,可以看出,在驱动电路300b中是以换流开关S1-S4(如M0SFET,金属氧化物场效应管)实现换流器302,以变压器T实现变压器304以及以双向三端开关(Triac)Ml-M4实现开关元件306a-306d。 Referring to FIG. 3A and 3B, it can be seen that, based on the commutation switches S1-S4 (M0SFET such as, metal oxide field effect transistor) to achieve an inverter 302, the transformer 304 to transformer T to achieve the driving circuit 300b, and a bidirectional three-terminal switch (Triac) Ml-M4 implement the switching elements 306a-306d. 其中, 换流开关Sl及S3互相串联后与一直流电源Vdc并联,换流开关S2及S4互相串联后也与直流电源Vdc并联。 Wherein the commutation switches Sl and S3 connected in series after each other in parallel with a DC power source Vdc, the commutation switches S2 and S4 connected in series with each other and also in parallel to the DC power source Vdc. 变压器T的第一次侧的两端分别连接于换流开关S1、 S3之间以及换流开关S2、 S4之间。 Both ends of the primary side of the transformer T are connected to the commutation switches S1, S3, and between the commutation switches S2, between S4. 如此,当以换流开关S1、 S2为一组,以及以换流开关S3、 S4为另一组互相快速切换后,便会有交流电流流经变压器T的第一次侧,并于第二次侧感应产生出用以点亮背光区块104a-104d Thus, when the commutation to switches S1, S2 as a group, as well as commutation switches S3, S4 to the other group of fast switching each other, there will be alternating current flowing through the first side of the transformer T, and the second induced to produce the secondary side of the lighting of the backlight blocks 104a-104d

的交流驱动电压。 The AC drive voltage.

在本实施例中,利用双向三端开关M1-M4分别串联于变压器T的第二次侧以及背光区块104a-104d之间作为是否点亮背光区块104a-104d的控制元件,但也可利用其它种类的可控式双向导通元件来作为此种控制元件。 In the present embodiment, using TRIAC M1-M4 are connected in series 104a-104d control elements 104a-104d between the second side of the transformer T, and a backlight is lit backlight block as a block, but may also using other types of controllable bidirectional conduction element such as a control element. 如前所述, As mentioned earlier,

当需要点亮背光区块104a时便导通双向三端开关Ml即可,如此从变压器T 的第二次侧所产生的驱动电压便会将背光区块104a点亮。 When the backlight is lit required block 104a will TRIAC conduction can Ml, so that the driving voltage generated from the second side of the transformer T will be the lighting of the backlight block 104a. 同理,双向三端开关M2-M4分别控制着背光区块104b-104d的点亮与关闭。 Similarly, TRIAC M2-M4 are control block 104b-104d backlight lighting on and off. 另夕卜,在变压器T 的第一次侧及第二次侧上可分别串联阻隔电容C1及C2,用以阻隔电流中的直流成分。 Another Bu Xi, on the first side and the secondary side of the transformer T can be respectively connected in series blocking capacitors C1 and C2, for blocking the DC component of the current.

但考虑到变压器的容量限制,可以使用不同的变压器来对不同部分的背光区块提供驱动电压。 However, considering the limited capacity of the transformer, the transformer may be used to provide different driving voltages of different parts of the backlight blocks. 图4图示了符合本发明另一实施例的背光模块驱动电路架构400,其中包含了一换流器302、变压器402a与402b以及开关元件306a-306d。 FIG 4 illustrates an embodiment of the module in line with the backlight driving circuit 400 architecture to another embodiment of the present invention, which contains an inverter 302, a transformer 402a and 402b and the switching elements 306a-306d. 在此,由变压器402a所输出的驱动电压仅用以点亮背光模块中的背光区块104a及104b,而由变压器402b所输出的驱动电压仅用以点亮背光模块中的背光区块104c及104d。 Here, output by the transformer 402a to the backlight driving voltage only lit backlight unit blocks 104a and 104b, and 402b output by the transformer drive voltage only to illuminate the backlight module 104c and a backlight blocks 104d. 本实施例中的驱动单元包含了一换流器(换流器302)以及两个变压器(变压器402a及402b),如此虽然较图3A所示的电路架构300a多出一个变压器,但变压器402a及402b的容量可较图3A中的变压器304小。 In this embodiment the driving unit comprises a converter (inverter 302) and two transformers (transformers 402a and 402b), although such a circuit structure shown in FIG. 3A 300a extra than one transformer, the transformers 402a and 402b, 304 may be smaller than the capacity of the transformer of FIG. 3A.

开关元件306a-306d的作用一样是用以个别控制背光区块104a-104d的点亮与关闭。 Action switching elements 306a-306d is the same as for an individual control of the backlight blocks 104a-104d and off lighting. 开关元件306a及306b分别装置在背光区块104a及104b与变压器402a之间,而开关元件306c及306d分别装置在背光区块104c及104d与变压器402b之间。 Switching elements 306a and 306b, respectively, between the backlight blocks means 104a and 104b of the transformer 402a, 306c and 306d, respectively, and switching element means between the backlight blocks 104c and 104d of the transformer 402b. 以开关元件306a为例,开关元件306a的两端分别连接了变压器402a与背光区块104a,当需要点亮背光区块104a时便导通开关元件306a 即可,如此变压器402a所输出的驱动电压便会将背光区块104a点亮。 A switching element 306a, for example, across the switching element 306a of the transformer 402a and 104a are connected to the blocks of the backlight, the backlight is lit when it is necessary it blocks the switching elements 104a to 306a, 402a so that the output transformer driving voltage the backlight 104a will block light. 同理, 幵关元件306b-306d分别控制着背光区块104b-104d的点亮与关闭,但背光区块104c及104d的驱动电压是由变压器402b所提供。 Similarly, Jian switching elements 306b-306d, respectively, the control block 104b-104d backlight lighting on and off, but the backlight blocks 104c and 104d of the driving voltage is provided by a transformer 402b.

同样地,在本实施例中,换流器302的作业可通过多个换流开关的快速切换来达成。 Similarly, in the present embodiment, the inverter 302 may be quickly switched by operating a plurality of switches to achieve commutation. 开关元件306a-306d可通过双向三端开关或其它种类的可控式双向导通元件来达成。 Switching elements 306a-306d may be achieved by a bidirectional three-terminal switches or other types of controllable bidirectional conduction element. 在变压器402a、 402b的第一及第二次侧上都可再连接用以阻隔直流成分的阻隔电容。 On 402a, 402b of the first and second secondary side of the transformer can be re-connected to the DC component blocking capacitor barrier.

在图3A及图4所示的电路架构300a及400中,开关元件306a-306d都装置于变压器304、 402a及402b的第二次侧。 In FIG. 3A and FIG circuit structure 400 and 300a in FIG. 4, the switching elements 306a-306d are in the apparatus 304, the second side of the transformer 402a and 402b. 但当驱动电路架构中变压器的数量与背光区块的数量相等时,也可将开关元件装置于变压器的第一次侧。 Equal number of blocks but the backlight driving circuit architecture of the transformer, the switching element may be a transformer means to the first side. 如图5所示的背光模块驱动电路架构500,其中包含了一换流器302、变压器502a-502d以及开关元件306a-306d。 The backlight module shown in FIG. 5 drive circuit architecture 500, which includes 302, 502a-502d and the transformer a switching element of the inverter 306a-306d. 在此,变压器及背光区块的数量相同, 也即由变压器502a-502d所输出的驱动电压会分别用以背光区块104a-104d。 Here, the same number of transformers and a backlight block, i.e. by the transformer 502a-502d are respectively outputted from the driving voltage to the backlight blocks 104a-104d. 本实施例中的驱动单元包含了一换竭器(换流器302)以及四个变压器(变压器502a-502d),如此虽然会使用较多的变压器,但变压器502a-502d的容量可以较小。 In this embodiment the driving unit comprises a converter exhaust device (inverter 302) and four transformers (transformer 502a-502d), so although it will use more transformers, but the capacity of the transformer 502a-502d can be smaller.

开关元件306a-306d的作用一样是用以个别控制背光区块104a-104d的点亮与关闭,但在本实施例中,开关元件306a-306d分别装置在变压器502a-502d 及换流器302之间,此时开关元件306a-306d分别能够控制变压器502a-502d 的激活与否。 306a-306d are acting as switching elements for individually controlling a backlight lighting block 104a-104d and closing, but in the present embodiment, the switching elements 306a-306d, respectively, means in the transformer 502a-502d and the inverter 302 Room case switching elements 306a-306d, respectively, can be controlled to activate or not the transformer 502a-502d. 以开关元件306a为例,开关元件306a的两端分别连接了换流器302与变压器502a,当需要点亮背光区块104a时便导通开关元件306a即可, 如此能够激活变压器502a输出驱动电压点亮背光区块104a点亮。 In an example the switching elements 306a, 306a, respectively, across the switching elements of the inverter 302 is connected to the transformer 502a, the backlight is lit when it is necessary it blocks the switching elements 104a to 306a, 502a of the transformer can be activated so the output drive voltage lighting the lighting backlight block 104a. 同理,开关元件306b-306d分别控制着变压器502b-502d的激活与停止,进而控制了背光区块104b-104d的点亮与关闭。 Similarly, the switching elements 306b-306d control the activation and stopping the transformer 502b-502d, and then control the backlight lighting block 104b-104d and closing.

同样地,在本实施例中,换流器302的作业可通过多个换流开关的快速切换来达成。 Similarly, in the present embodiment, the inverter 302 may be quickly switched by operating a plurality of switches to achieve commutation. 开关元件306a-306d可通过双向三端开关或其它种类的可控式双向导通元件来达成。 Switching elements 306a-306d may be achieved by a bidirectional three-terminal switches or other types of controllable bidirectional conduction element. 在变压器502a-504d的第一及第二次侧上都可再连接用以阻隔直流成分的阻隔电容。 On the first and second secondary side of the transformer 502a-504d can be reconnected to the DC component blocking capacitor barrier.

当然,本发明还可有其他多种实施例,在不背离本发明精神及其实质的情况下,熟悉本领域的技术人员可根据本发明做出各种相应的改变和变形,但这些相应的改变和变形都应属于本发明权利要求的保护范围。 Of course, the present invention may have many other embodiments without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding modifications and variations according to the present invention, these corresponding modifications and variations shall fall into the scope of the claims of the invention.

Claims (12)

1、一种背光模块驱动电路,用以点亮一背光模块中的多个背光区块,其特征在于,包含: 一换流器,用以将一直流电压转换为一交流电压; 多个变压器,其中每一该变压器能够将该交流电压转换为一驱动电压,且该驱动电压供驱动该背光区块;以及多个开关元件,分别耦接于该多个变压器和该换流器之间,用以决定是否点亮该多个背光区块, 其中当该多个开关元件其中之一被导通时,该开关元件所耦接的变压器所输出的驱动电压会将该多个背光区块其中之一点亮。 1, a backlight module driving circuit for lighting a plurality of backlight blocks in a backlight module, wherein, comprising: a converter for converting the DC voltage into an AC voltage; a plurality of transformers wherein each of the AC voltage of the transformer can be converted into a driving voltage, and the driving voltage for driving the backlight block; and a plurality of switching elements respectively coupled between the plurality of transformers and the converter, for determining whether the plurality of the lighting of the backlight blocks, wherein when one of the plurality of switching elements which are turned on, the switching element coupled to the transformer output voltage driving the plurality of backlight blocks wherein one lit.
2、 根据权利要求1所述的背光模块驱动电路,其特征在于,该开关元件非同时被导通以及关闭。 2, the backlight driving circuit module as claimed in claim, wherein the switching element is non-conducting and close simultaneously.
3、 根据权利要求l所述的背光模块驱动电路,其特征在于,该换流器具有两组换流开关,通过相互切换该两组换流开关可将该直流电压切换成该交流电压。 3, the backlight driving circuit module as claimed in claim l, characterized in that the inverter has two switches commutation, the commutation switches route the DC voltage into an AC voltage by the switching between the two groups.
4、 根据权利要求3所述的背光模块驱动电路,其特征在于,该两组换流开关包含多个金属氧化物场效应管。 4, according to claim 3, the backlight module driving circuit, characterized in that the two commutation switches comprising a plurality of metal oxide field effect transistors.
5、 根据权利要求1所述的背光模块驱动电路,其特征在于,该开关元件为双向三端开关。 5. The backlight module as claimed in claim 1 driving circuit, characterized in that the switching element is a TRIAC.
6、 根据权利要求1所述的背光模块驱动电路,其特征在于,还包含多个阻隔电容分别连接于该变压器的第一次侧及第二次侧,用以阻隔该交流电压以及驱动电压中的直流成分。 6. The backlight module according to a driving circuit as claimed in claim, wherein further comprising a primary side and the secondary side of the first plurality of blocking capacitors respectively connected to the transformer to the AC voltage, and the barrier driving voltage DC component.
7、 一种显示面板,其特征在于,包含: 一像素数组,包含多个显示区块;一背光模块,包含多个背光区块,其中该背光区块的位置与该显示区块互相对应;一背光模块驱动电路,用以点亮该背光区块,其中该背光模块驱动电路包含:一换流器,用以将一直流电压转换为一交流电压;多个变压器,其中每一该变压器能够将该交流电压转换为一驱动电压,其中该驱动电压供驱动该背光区块;以及多个开关元件,分别耦接于该多个变压器和该换流器之间,用以决定是否点亮该多个背光区块,其中当该多个开关元件其中之一被导通时,该开关元件所耦接的变压器所输出的驱动电压会将该多个背光区块其中之一点亮。 7. A display panel comprising: a pixel array, comprising a plurality of display blocks; a backlight module, a backlight comprising a plurality of blocks, wherein the backlight block corresponding to each position of the display area; a backlight module driving circuit for lighting the backlight block, wherein the backlight module driving circuit comprising: an inverter for converting the DC voltage into an AC voltage; a plurality of transformers, wherein each transformer can be the AC voltage is converted into a driving voltage, wherein the driving voltage for driving the backlight block; and a plurality of switching elements respectively coupled between the plurality of transformers and the converter, for determining whether the lighting a plurality of backlight blocks, wherein when one of the plurality of switching elements which are turned on, the switching element coupled to the transformer output voltage driving the plurality of blocks wherein one of the lighting of the backlight.
8、 根据权利要求7所述的显示面板,其特征在于,该开关元件非同时被导通以及关闭。 8, the display panel according to claim 7, wherein the switching element is non-conducting and close simultaneously.
9、 根据权利要求7所述的显示面板,其特征在于,该换流器具有两组换流开关,通过相互切换该两组换流开关可将该直流电压切换成该交流电压。 9, the display panel according to claim 7, characterized in that the inverter has two switches commutation, the commutation switches route the DC voltage into an AC voltage by the switching between the two groups.
10、 根据权利要求9所述的显示面板,其特征在于,该两组换流开关包含多个金属氧化物场效应管。 10. The display panel of claim 9, characterized in that the two commutation switches comprising a plurality of metal oxide field effect transistors.
11、 根据权利要求7所述的显示面板,其特征在于,该开关元件为双向三端开关。 11, the display panel according to claim 7, wherein the switching element is a TRIAC.
12、 根据权利要求9所述的显示面板,其特征在于,还包含多个阻隔电容分别连接于该变压器的第一次侧及第二次侧,用以阻隔该交流电压以及驱动电压中的直流成分。 12. The display panel of claim 9, wherein, further comprising a plurality of first blocking capacitor and the secondary side are connected to the side of the transformer, the AC voltage, and for blocking the driving voltage of the DC ingredient.
CN 200610058697 2006-03-08 2006-03-08 Driving circuit for backlight module and the display panel with the same CN100578594C (en)

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JP4956520B2 (en) 2007-11-13 2012-06-20 ミツミ電機株式会社 A backlight device and a liquid crystal display device using the same
CN101989406B (en) 2009-07-29 2013-07-03 晨星软件研发(深圳)有限公司 Display control circuit with extremely low power consumption and related method thereof
CN106205505B (en) * 2016-08-23 2018-09-04 深圳市华星光电技术有限公司 Backlight driving circuit

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US20050218826A1 (en) 2002-10-02 2005-10-06 Kang Chang-Lung Multi-lamp backlight system
CN1538793A (en) 2003-04-15 2004-10-20 美国凹凸微系有限公司 Power for LCD screen
CN2706992Y (en) 2003-10-30 2005-06-29 美国凹凸微系有限公司 Circuit structure for driving multi-cold cathode fluorescent tubes
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CN1683971A (en) 2004-04-14 2005-10-19 Lg.菲利浦Lcd株式会社 Driving unit of fluorescent lamp and its driving method

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