WO2012167453A1 - 背光模块及显示装置 - Google Patents

背光模块及显示装置 Download PDF

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Publication number
WO2012167453A1
WO2012167453A1 PCT/CN2011/076182 CN2011076182W WO2012167453A1 WO 2012167453 A1 WO2012167453 A1 WO 2012167453A1 CN 2011076182 W CN2011076182 W CN 2011076182W WO 2012167453 A1 WO2012167453 A1 WO 2012167453A1
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Prior art keywords
transistor
power switch
driving circuit
light emitting
driving
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Ceased
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PCT/CN2011/076182
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English (en)
French (fr)
Inventor
杨翔
高新明
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US13/260,327 priority Critical patent/US8866404B2/en
Publication of WO2012167453A1 publication Critical patent/WO2012167453A1/zh
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G09G2330/023—Power management, e.g. power saving using energy recovery or conservation
    • G09G2330/024—Power management, e.g. power saving using energy recovery or conservation with inductors, other than in the electrode driving circuitry of plasma displays

Definitions

  • the invention relates to a driving circuit of a light emitting diode, in particular to an LED driving circuit applied to a backlight module and a display device
  • Liquid crystal display (Liquid Crystal Display, LCD) has been widely used in a variety of electronic products, most of the liquid crystal display is a backlight type liquid crystal display, which is composed of a liquid crystal display panel and a backlight module (backlight Module).
  • the backlight module can be divided into a side-light type and a direct-light type according to the incident position of the light source (Direct-light) Type) Two to provide a backlight to the LCD panel.
  • Direct-light Direct-light
  • LED Due to light-emitting diodes (Light-Emitting) Diode, LED) has good optoelectronic properties such as low power consumption, low heat generation, long operating life, impact resistance, small volume, fast response, and color light that emits stable wavelengths, so it is suitable for use in backlight modules.
  • the load end needs to use a capacitor with a large power density, so that when the inductor is charged, the capacitor can be used to discharge the load. Furthermore, when the number of LEDs of the LED backlight module increases and the load becomes large, multiple sets of BOOST lines or units are generally used instead of a single set of BOOST lines or units to drive the LEDs of the backlight module due to mechanism size or temperature considerations.
  • a capacitor having a high power density in general is an electrolytic capacitor which has a life limit and thus limits the service life of the backlight driving circuit. Furthermore, when using multiple sets of BOOST lines or units for driving, multiple BOOSTs are required. The IC chip thus greatly increases the cost of the backlight driving circuit.
  • the invention provides a driving circuit of a light emitting diode and a backlight module and a display device thereof for solving the problem of the existing driving circuit.
  • the invention provides a driving circuit of a light emitting diode and a backlight module and a display device thereof for solving the problem of the existing driving circuit.
  • a main object of the present invention is to provide a driving circuit for driving a plurality of light emitting diodes, the driving circuit comprising:
  • a first inductor connected between the light emitting diode and the power source
  • a second inductor connected between the plurality of light emitting diodes and the power source
  • a first power switch connected between the first inductor and the light emitting diode
  • a driving circuit unit for outputting a driving signal having a high level and a low level
  • a push-pull circuit connected to the first power switch and the second power switch for receiving the high-level or low-level signal input by the driving circuit unit, and according to the high level or low
  • the level signal drives the first power switch and the second power switch to be turned on alternately.
  • a further object of the present invention is to provide a backlight module, the backlight module comprising:
  • a first inductor connected between the light emitting diode and the power source
  • a second inductor connected between the plurality of light emitting diodes and the power source
  • a first power switch connected between the first inductor and the light emitting diode
  • a driving circuit unit for outputting a driving signal having a high level and a low level
  • a push-pull circuit connected to the first power switch and the second power switch for receiving the high-level or low-level signal input by the driving circuit unit, and according to the high level or low
  • the level signal drives the first power switch and the second power switch to be turned on alternately.
  • the backlight module includes:
  • a driving circuit electrically connected to the plurality of light emitting diodes for driving the plurality of light emitting diodes, wherein the driving circuit comprises:
  • a first inductor connected between the light emitting diode and the power source
  • a second inductor connected between the plurality of light emitting diodes and the power source
  • a first power switch connected between the first inductor and the light emitting diode
  • a driving circuit unit for outputting a driving signal having a high level and a low level
  • a push-pull circuit connected to the first power switch and the second power switch for receiving the high-level or low-level signal input by the driving circuit unit, and according to the high level or low
  • the level signal drives the first power switch and the second power switch to be turned on alternately.
  • the first power switch is a P-channel MOS transistor
  • the second power switch is an N-channel MOS transistor
  • the push-pull circuit includes a first transistor and a second transistor, the collector of the first transistor is connected to another power source, and the emitter of the first transistor is connected to the An emitter of the second transistor, a base of the first transistor is connected to the driving circuit unit, a collector of the second transistor is electrically grounded, and a base of the second transistor is connected to the The drive circuit unit.
  • the first transistor when the driving circuit unit outputs the driving signal of the high level to the push-pull circuit, the first transistor is in an on state, and the first power switch is a guide. In the on state, the second power switch is in an off state, and when the driving circuit unit outputs the driving signal of the low level to the push-pull circuit, the first transistor is in an off state, and the first power is The switch is in an off state, and the second power switch is in an on state.
  • the driving circuit unit is a driving integrated circuit chip.
  • the driving circuit of the light emitting diode of the present invention and the backlight module and the display device thereof can omit the electrolytic capacitor or the capacitance of a large capacitance value, thereby ensuring the service life of the driving circuit. Moreover, the driving circuit of the present invention can reduce the use of the BOOST circuit or the IC chip, thereby greatly reducing the cost of the circuit assembly.
  • the driving circuit of the light emitting diode of the present invention and the backlight module and the display device thereof can omit the electrolytic capacitor or the capacitance of a large capacitance value, thereby ensuring the service life of the driving circuit. Moreover, the driving circuit of the present invention can reduce the use of the BOOST circuit or the IC chip, thereby greatly reducing the cost of the circuit assembly.
  • FIG. 1 is a cross-sectional view showing a backlight module and a display panel in accordance with a first embodiment of the present invention
  • FIG. 2 shows a circuit diagram of a driving circuit in accordance with an embodiment of the present invention
  • FIG 3 is a cross-sectional view showing a backlight module in accordance with another embodiment of the present invention.
  • FIG. 1 shows a cross-sectional view of a backlight module and a display panel according to an embodiment of the invention.
  • the driving circuit 150 of this embodiment can be used to drive a plurality of light emitting diodes (Light-Emitting) Diode, LED) 120, these LEDs 120 can be connected in series to form a string of LEDs to serve as a light source for the backlight module 100.
  • the backlight module 100 can be a lateral light input or a direct light input light, which is disposed relative to a display panel 101 (for example, a liquid crystal display panel) to form a display device (for example, a liquid crystal display device).
  • the backlight module 100 can be, for example, a direct type backlight module including a back plate 110, a plurality of light emitting diodes (LEDs) 120, a circuit board 130, a reflective layer 140, a driving circuit 150, and an optical film 160.
  • the circuit board 130 can be disposed on the back board 110.
  • the LED 120 can be disposed on the circuit board 130 and electrically connected to the circuit board 130 for emitting light to the display panel 101.
  • the reflective layer 140 is formed around the light emitting diode 120 (for example, formed on the circuit board 130 or the back plate 110) to reflect the light of the LED 120.
  • the driving circuit 150 can be electrically connected to the LED 120 through the circuit board 130 for driving the LED 120 to emit light.
  • the optical film 160 is disposed above the light emitting diode 120 to improve the uniformity of illumination or the luminous efficiency of the light emitting diode 120.
  • the back plate 110 of the present embodiment is made of an opaque material, such as a plasticized material, a metal material, or a combination of the above materials, for carrying the LED 120 and the circuit board 130 .
  • the LED 120 can be disposed on the circuit board 130 and electrically connected to the driving circuit 150 through the circuit board 130.
  • Circuit board 130 can be a printed circuit board (Printed Circuit board, PCB) or flexible printed circuit board (Flexible Printed Circuits, FPC).
  • the reflective layer 140 can be, for example, a reflective plate, a reflective sheet, or a reflective coating that forms between or around the light emitting diodes 120 for reflecting light.
  • the reflective layer 140 is made of a high reflectivity material such as silver, aluminum, gold, chromium, copper, indium, antimony, nickel, platinum, rhodium, iridium, tin, antimony, tungsten, manganese, any combination thereof.
  • the optical film 160 is, for example, a diffusion sheet, a prism sheet, and a brightness enhancement film (Brightness) Enhancement Film, BEF), Reflective Brightness Enhancement Film (Dual Brightness Enhancement) Film, DBEF), non-multilayer film reflective polarizer (Diffused Reflective Polarizer) Film, DRPF) or any combination of the above, which is located on the light emitting diode 120.
  • BEF Brightness Enhancement Film
  • DBEF Reflective Brightness Enhancement Film
  • DBEF Reflective Brightness Enhancement Film
  • DBEF Reflective Brightness Enhancement Film
  • DRPF non-multilayer film reflective polarizer
  • the driving circuit 150 of this embodiment may include a first inductor 151, a second inductor 152, a first power switch 153, a second power switch 154, a push-pull (PUSH-PULL) circuit 155, a driving circuit unit 156, and a constant current module 157. , diodes D1 and D2.
  • the first inductor 151 is connected between the LED 120 and the power source V1
  • the second inductor 152 is connected between the LED 120 and the power source V1
  • the first power switch 153 is connected between the first inductor 151 and the LED 120
  • the second power switch 154 is connected between the second inductor 152 and the LED 120
  • the push-pull circuit 155 is connected to the first power switch 153 and the second power switch 154
  • the driving circuit unit 156 is connected to the push-pull circuit 155.
  • the flat or low level signal drives the first power switch 153 and the second power switch 154 to alternately conduct.
  • the constant current module 157 is connected in series to the light emitting diode 120 for stabilizing the current of the light emitting diode 120, so that the light emitting diode 120 can have a uniform current.
  • the diode D1 is connected between the first inductor 151 and the light emitting diode 120, and the diode D2 is connected between the second inductor 152 and the light emitting diode 120.
  • the first power switch 153 of this embodiment is, for example, an enhancement type P-channel metal oxide semiconductor (PMOS) transistor whose drain is connected between the first inductor 151 and the diode D1; It is electrically grounded; its gate is connected to push-pull circuit 155.
  • the second power switch 154 of this embodiment is, for example, a depletion mode N-channel metal oxide semiconductor (NMOS) transistor, the drain of which is connected between the second inductor 152 and the diode D2; the source thereof is electrically grounded; Its gate is connected to a push-pull circuit 155.
  • NMOS N-channel metal oxide semiconductor
  • the push-pull circuit 155 of the present embodiment may include a first transistor T1 and a second transistor T2.
  • the collector of the first transistor T1 is connected to another power source V2
  • the emitter of the first transistor T1 is connected to the emitter of the second transistor T2
  • the base of the first transistor T1 is connected to the driving circuit unit 156.
  • the collector of the second transistor T2 is electrically grounded, the emitter of the second transistor T2 is connected to the emitter of the first transistor T1, and the base of the second transistor T2 is connected to the driving circuit unit 156.
  • the driving circuit unit 156 of this embodiment is, for example, a driving integrated circuit (IC) chip for providing driving signals (for example, voltage signals) of different potentials to the push-pull circuit 155.
  • driving circuit unit 156 outputs a driving signal of a high level to the push-pull circuit 155
  • the first transistor T1 is in an on state
  • the first power switch 153 is in an on state
  • the second power switch 154 is in an off state.
  • the first inductor 151 may be in a discharged state
  • the second inductor 152 may be in a charged state.
  • the driving circuit unit 156 when the driving circuit unit 156 outputs a driving signal of a low level to the push-pull circuit 155, the first transistor T1 is in an off state, the first power switch 153 is in an off state, and the second power switch 154 is in an on state. At this time, the first inductor 151 may be in a charged state, and the second inductor 152 may be in a discharged state.
  • the driving circuit 150 of the present invention can utilize the push-pull circuit 155 to drive the first power switch 153 and the second power switch 154 respectively, so that the first power switch 153 and the second power switch 154 can be alternately turned on to continuously
  • the first inductor 151 or the second inductor 152 is allowed to discharge to the light emitting diode 120. Therefore, when the driving circuit 150 outputs a driving signal of high or low level, the LED 120 at the load end can continuously obtain current by the inductor 151 or 152 without using an electrolytic capacitor or a capacitor having a large capacitance. In the circuit to ensure the life of the drive circuit.
  • the driving effect achieved by the driving circuit 150 of the present invention can be equivalent to the driving circuit using a plurality of sets of BOOST circuits or IC chips. Therefore, the driving circuit 150 of the present invention can reduce the use of the BOOST circuit or the IC chip, and greatly Reduce the cost of circuit components.
  • the driving circuit 250 can also be applied to a side-lit light-emitting backlight module.
  • the backlight module 200 may include a back plate 210, a plurality of light emitting diodes 220, a circuit board 230, a reflective layer 240, a driving circuit 250, an optical film 260, and a light guide plate 270.
  • the light guide plate 270 is disposed on the back plate 210, and the light emitting diode 220 can be disposed on the circuit board 230 to form a light strip (light) Bar) may be disposed on one side of the light guide plate 270 for laterally emitting light into the light guide plate 270, and is guided by the light guide plate 270 to emit light.
  • the driving circuit 250 can be electrically connected to the LED 220 through the circuit board 230 for driving the LED 220.
  • the driving circuit of the light-emitting diode of the present invention and the backlight module and the display device therefor can use a push-pull circuit instead of an electrolytic capacitor or a large-capacitance capacitor, thereby ensuring the service life of the driving circuit.
  • the driving circuit of the present invention can reduce the use of the BOOST chip, thereby greatly reducing the cost of the circuit assembly.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
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Abstract

一种发光二极管的驱动电路及使用该驱动电路的背光模块与显示装置。该驱动电路包括第一电感、第二电感、第一功率开关、第二功率开关、推挽电路及驱动电路单元。第一电感及第二电感连接于发光二极管与电源之间，第一功率开关连接于第一电感与发光二极管之间，第二功率开关连接于第二电感与发光二极管之间，推挽电路连接于第一功率开关与第二功率开关，驱动电路单元是连接于所述推挽电路。使用该驱动电路可省略电解电容或大容值的电容。

Description

背光模块及显示装置 技术领域
本发明涉及一种发光二极管的驱动电路，特别是涉及一种应用于背光模块与显示装置的发光二极管驱动电路
 背景技术
液晶显示器(Liquid Crystal Display，LCD)已被广泛应用于各种电子产品中，液晶显示器大部分为背光型液晶显示器，其是由液晶显示面板及背光模块(backlight module)所组成。背光模块可依照光源入射位置的不同分成侧向式入光(Side-light type)与直下式入光(Direct-light type)两种，藉以提供背光源至液晶显示面板。
由于发光二极管(Light-Emitting Diode，LED)具有低耗电量、低发热量、操作寿命长、耐撞击、体积小、反应速度快、以及可发出稳定波长的色光等良好光电特性，因而适合应用于背光模块的光源。
目前，在一般LED背光模块的驱动升压(BOOST)线路中，负载端需要使用功率密度大的电容，以便在电感充电时，可利用电容来对负载进行放电。再者，当LED背光模块的LED数量增加且负载变大时，因为机构尺寸或者温度的考虑，一般使用多组BOOST线路或单元来代替单组BOOST线路或单元，以驱动背光模块的LED。
然而，一般具有大功率密度的电容为电解电容，其具有寿命限制，因而限制背光驱动电路的使用寿命。再者，当使用多组BOOST线路或单元来进行驱动时，需要多颗BOOST IC芯片，因而大幅地提高背光驱动电路的成本。
故，有必要提供一种发光二极管的驱动电路及其应用的背光模块与显示装置，以解决现有技术所存在的问题。
 技术问题
本发明提供一种发光二极管的驱动电路及其应用的背光模块与显示装置，以解决现有驱动电路的的问题。
技术解决方案
本发明提供一种发光二极管的驱动电路及其应用的背光模块与显示装置，以解决现有驱动电路的的问题。
本发明的主要目的在于提供一种驱动电路，用于驱动多个发光二极管，所述驱动电路包括：
第一电感，连接于所述发光二极管与电源之间；
第二电感，连接于所述多个发光二极管与所述电源之间；
第一功率开关，连接于所述第一电感与所述发光二极管之间；
第二功率开关，连接于所述第二电感与所述发光二极管之间；
驱动电路单元，用于输出一具有高电平及低电平的驱动信号；以及
推挽电路，连接于所述第一功率开关与所述第二功率开关，用于接收所述驱动电路单元输入的所述高电平或低电平信号，并根据所述高电平或低电平信号驱动所述第一功率开关和所述第二功率开关交替地导通。
本发明的又一目的在于提供一种背光模块，所述背光模块包括：
背板；
多个发光二极管，设置于所述背板上；以及
驱动电路，电性连接于所述发光二极管，用于驱动所述多个发光二极管，其中所述驱动电路包括：
第一电感，连接于所述发光二极管与电源之间；
第二电感，连接于所述多个发光二极管与所述电源之间；
第一功率开关，连接于所述第一电感与所述发光二极管之间；
第二功率开关，连接于所述第二电感与所述发光二极管之间；
驱动电路单元，用于输出一具有高电平及低电平的驱动信号；以及
推挽电路，连接于所述第一功率开关与所述第二功率开关，用于接收所述驱动电路单元输入的所述高电平或低电平信号，并根据所述高电平或低电平信号驱动所述第一功率开关和所述第二功率开关交替地导通。
本发明的又一目的在于提供一种显示装置，所述显示装置包括：
显示面板；以及
背光模块，包括：
背板；
多个发光二极管，设置于所述背板上；以及
驱动电路，电性连接于所述个发光二极管，，用于驱动所述多个发光二极管，其中所述驱动电路包括：
第一电感，连接于所述发光二极管与电源之间；
第二电感，连接于所述多个发光二极管与所述电源之间；
第一功率开关，连接于所述第一电感与所述发光二极管之间；
第二功率开关，连接于所述第二电感与所述发光二极管之间；
驱动电路单元，用于输出一具有高电平及低电平的驱动信号；以及
推挽电路，连接于所述第一功率开关与所述第二功率开关，用于接收所述驱动电路单元输入的所述高电平或低电平信号，并根据所述高电平或低电平信号驱动所述第一功率开关和所述第二功率开关交替地导通。
在本发明的一实施例中，所述第一功率开关为P沟道金属氧化物半导体晶体管，所述第二功率开关为N沟道金属氧化物半导体晶体管。
在本发明的一实施例中，所述推挽电路包括第一晶体管和第二晶体管，所述第一晶体管的集极是连接于另一电源，所述第一晶体管的射极是连接于所述第二晶体管的射极，所述第一晶体管的基极是连接于所述驱动电路单元，所述第二晶体管的集极是电性接地，所述第二晶体管的基极是连接于所述驱动电路单元。
在本发明的一实施例中，当所述驱动电路单元输出所述高电平的驱动信号至所述推挽电路时，所述第一晶体管为导通状态，所述第一功率开关为导通状态，所述第二功率开关为截止状态，当所述驱动电路单元输出所述低电平的驱动信号至所述推挽电路时，所述第一晶体管为截止状态，所述第一功率开关为截止状态，所述第二功率开关为导通状态。
在本发明的一实施例中，所述驱动电路单元为一驱动集成电路芯片。
本发明的发光二极管的驱动电路及其应用的背光模块与显示装置可省略电解电容或大容值的电容，因而可确保驱动电路的使用寿命。且本发明的驱动电路可减少BOOST电路或IC芯片的使用，因而可大幅地减少电路组件成本。
为让本发明的上述内容能更明显易懂，下文特举优选实施例，并配合所附图式，作详细说明如下：
 有益效果
本发明的发光二极管的驱动电路及其应用的背光模块与显示装置可省略电解电容或大容值的电容，因而可确保驱动电路的使用寿命。且本发明的驱动电路可减少BOOST电路或IC芯片的使用，因而可大幅地减少电路组件成本。
附图说明
图1显示依照本发明的第一实施例的背光模块与显示面板的剖面示意图；
图2显示依照本发明的一实施例的驱动电路的电路图；以及
图3显示依照本发明的另一实施例的背光模块的剖面示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
在图中，结构相似的单元是以相同标号表示。
请参照图1，其显示依照本发明的一实施例的背光模块与显示面板的剖面示意图。本实施例的驱动电路150可用以驱动多个发光二极管(Light-Emitting Diode，LED)120，这些发光二极管120可串联成一发光二极管串，以作为背光模块100的光源。此背光模块100可为侧向式入光或直下式入光，其相对于一显示面板101(例如液晶显示面板)来设置，而形成一显示装置(例如液晶显示装置)。在本实施例中，背光模块100可例如为直下式背光模块，其包括背板110、多个发光二极管(LED)120、电路板130、反射层140、驱动电路150及光学膜片160。电路板130可设置于背板110上，发光二极管120可设置于电路板130上，并电性连接于电路板130，用以发光来提供光线至显示面板101。反射层140是形成于发光二极管120的周围(例如形成于电路板130或背板110上)，用以反射发光二极管120的光线。驱动电路150可通过电路板130来电性连接于发光二极管120，用以驱动发光二极管120来发光。光学膜片160是设置于发光二极管120上方，用以改善发光二极管120的发光均匀性或发光效率。
如图1所示，本实施例的背板110是由不透光材质所制成，例如：塑化材料、金属材料或上述材料的组合，用以承载发光二极管120及电路板130。发光二极管120可设置于电路板130上，并通过电路板130来电性连接于驱动电路150。电路板130可为印刷电路板(Printed circuit board，PCB)或柔性印刷电路板(Flexible Printed Circuits，FPC)。反射层140可例如为反射板、反射片或反射涂层，其形成发光二极管120之间或其周围，用以反射光线。此反射层140是由高反射率材料所制成，例如银、铝、金、铬、铜、铟、铱、镍、铂、铼、铑、锡、钽、钨、锰、其上述任意组合的合金或耐黄化且耐热的白色反射漆料，用以反射发光二极管120的光线。光学膜片160例如为：扩散片、棱镜片、增亮膜(Brightness Enhancement Film，BEF)、反射式增亮膜(Dual Brightness Enhancement Film，DBEF)、非多层膜式反射偏光片(Diffused Reflective Polarizer Film，DRPF)或上述的任意组合，其位于发光二极管120上。
请参照图2，其显示依照本发明的一实施例的驱动电路的电路图。本实施例的驱动电路150可包括第一电感151、第二电感152、第一功率开关153、第二功率开关154、推挽(PUSH-PULL)电路155、驱动电路单元156、恒流模块157、二极管D1及D2。第一电感151是连接于发光二极管120与电源V1之间，第二电感152连接于发光二极管120与电源V1之间，第一功率开关153是连接于第一电感151与发光二极管120之间；第二功率开关154是连接于第二电感152与发光二极管120之间，推挽电路155是连接于第一功率开关153与第二功率开关154，驱动电路单元156是连接于推挽电路155，并输出一具有高电平及低电平的驱动信号至推挽电路155，使得推挽电路155可接收所述驱动电路单元156输入的高电平或低电平信号，并根据所述高电平或低电平信号驱动第一功率开关153与第二功率开关154来交替地导通。恒流模块157是串联于发光二极管120，用以稳定发光二极管120的电流，使得发光二极管120可具有一致的电流。二极管D1是连接于第一电感151与发光二极管120之间，二极管D2是连接于第二电感152与发光二极管120之间。
如图2所示，本实施例的第一功率开关153例如为增强型P沟道金属氧化物半导体(PMOS)晶体管，其漏极是连接于第一电感151与二极管D1之间；其源极是电性接地；其栅极是连接于推挽电路155。本实施例的第二功率开关154例如为耗尽型N沟道金属氧化物半导体(NMOS)晶体管，其漏极是连接于第二电感152与二极管D2之间；其源极是电性接地；其栅极是连接于推挽电路155。
如图2所示，本实施例的推挽电路155可包括第一晶体管T1和第二晶体管T2。第一晶体管T1的集极是连接于另一电源V2，第一晶体管T1的射极是连接于第二晶体管T2的射极，第一晶体管T1的基极是连接于驱动电路单元156。第二晶体管T2的集极是电性接地，第二晶体管T2的射极是连接于第一晶体管T1的射极，第二晶体管T2的基极是连接于驱动电路单元156。
如图2所示，本实施例的驱动电路单元156例如为一驱动集成电路(IC)芯片，用以提供不同电位的驱动信号(例如为电压信号)至推挽电路155。当驱动电路单元156输出高电平的驱动信号至推挽电路155时，第一晶体管T1为导通状态，第一功率开关153为导通状态，第二功率开关154为截止状态。此时，第一电感151可为放电状态，而第二电感152可为充电状态。反之，当驱动电路单元156输出低电平的驱动信号至推挽电路155时，第一晶体管T1为截止状态，第一功率开关153为截止状态，第二功率开关154为导通状态。此时，第一电感151可为充电状态，而第二电感152可为放电状态。
因此，本发明的驱动电路150可利用推挽电路155来分别驱动第一功率开关153与第二功率开关154，使得第一功率开关153与第二功率开关154可交替地导通，以持续地允许第一电感151或第二电感152来放电至发光二极管120。因此，当驱动电路150输出高或低电平的驱动信号时，在负载端的发光二极管120皆可持续地由电感151或152来获取电流，而不需使用电解电容或大容值的电容于驱动电路中，以确保驱动电路的使用寿命。再者，本发明的驱动电路150所达成的驱动效果可相当于使用多组BOOST电路或IC芯片的驱动电路，因此，本发明的驱动电路150可减少BOOST电路或IC芯片的使用，而大幅地减少电路组件成本。
请参照图3，其显示依照本发明的另一实施例的背光模块的剖面示意图。在另一实施例中，驱动电路250亦可应用于侧向式入光的背光模块。此时，背光模块200可包括背板210、多个发光二极管220、电路板230、反射层240、驱动电路250、光学膜片260及导光板270。导光板270是设置于背板210上，发光二极管220可设置于电路板230上，而形成发光灯条(light bar)，其可设置于导光板270的一侧，用以侧向发光至导光板270内，并由导光板270来导引出光。驱动电路250可通过电路板230来电性连接于发光二极管220，用以驱动发光二极管220。
由上述可知，本发明的发光二极管的驱动电路及其应用的背光模块与显示装置可利用推挽电路来取代电解电容或大容值的电容，因而可确保驱动电路的使用寿命。且本发明的驱动电路可减少BOOST芯片的使用，因而可大幅地减少电路组件成本。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
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Claims (14)

  1. 一种驱动电路，用于驱动多个发光二极管，其特征在于：所述驱动电路包括：
    第一电感，连接于所述发光二极管与电源之间；
    第二电感，连接于所述多个发光二极管与所述电源之间；
    P沟道金属氧化物半导体晶体管，连接于所述第一电感与所述发光二极管之间；
    N沟道金属氧化物半导体晶体管，连接于所述第二电感与所述发光二极管之间；
    驱动电路单元，连接于推挽电路，用于输出一具有高电平及低电平的驱动信号至推挽电路；以及
    推挽电路，连接于所述P沟道金属氧化物半导体晶体管所述N沟道金属氧化物半导体晶体管，用于接收所述驱动电路单元输入的所述高电平或低电平信号，并根据所述高电平或低电平信号驱动所述P沟道金属氧化物半导体晶体管所述N沟道金属氧化物半导体晶体管交替地导通，所述推挽电路包括第一晶体管和第二晶体管，所述第一晶体管的集极是连接于另一电源，所述第一晶体管的射极是连接于所述第二晶体管的射极，所述第一晶体管的基极是连接于所述驱动电路单元，所述第二晶体管的集极是电性接地，所述第二晶体管的基极是连接于所述驱动电路单元。
  2. 一种驱动电路，用于驱动多个发光二极管，其特征在于：所述驱动电路包括：
    第一电感，连接于所述发光二极管与电源之间；
    第二电感，连接于所述多个发光二极管与所述电源之间；
    第一功率开关，连接于所述第一电感与所述发光二极管之间；
    第二功率开关，连接于所述第二电感与所述发光二极管之间；
    驱动电路单元，连接于推挽电路，用于输出一具有高电平及低电平的驱动信号至推挽电路；以及
    推挽电路，连接于所述第一功率开关与所述第二功率开关，用于接收所述驱动电路单元输入的所述高电平或低电平信号，并根据所述高电平或低电平信号驱动所述第一功率开关和所述第二功率开关交替地导通。
  3. 根据权利要求2所述的驱动电路，其特征在于：所述第一功率开关为P沟道金属氧化物半导体晶体管，所述第二功率开关为N沟道金属氧化物半导体晶体管。
  4. 根据权利要求2所述的驱动电路，其特征在于：所述推挽电路包括第一晶体管和第二晶体管，所述第一晶体管的集极是连接于另一电源，所述第一晶体管的射极是连接于所述第二晶体管的射极，所述第一晶体管的基极是连接于所述驱动电路单元，所述第二晶体管的集极是电性接地，所述第二晶体管的基极是连接于所述驱动电路单元。
  5. 根据权利要求4所述的驱动电路，其特征在于：当所述驱动电路单元输出所述高电平的驱动信号至所述推挽电路时，所述第一晶体管为导通状态，所述第一功率开关为导通状态，所述第二功率开关为截止状态，当所述驱动电路单元输出所述低电平的驱动信号至所述推挽电路时，所述第一晶体管为截止状态，所述第一功率开关为截止状态，所述第二功率开关为导通状态。
  6. 根据权利要求2所述的驱动电路，其特征在于：所述驱动电路单元为一驱动集成电路芯片。
  7. 一种背光模块，其特征在于：所述背光模块包括：
    背板；
    多个发光二极管，设置于所述背板上；以及
    驱动电路，电性连接于所述发光二极管，用于驱动所述多个发光二极管，其中所述驱动电路包括：
    第一电感，连接于所述发光二极管与电源之间；
    第二电感，连接于所述多个发光二极管与所述电源之间；
    第一功率开关，连接于所述第一电感与所述发光二极管之间；
    第二功率开关，连接于所述第二电感与所述发光二极管之间；
    驱动电路单元，用于输出一具有高电平及低电平的驱动信号；以及
    推挽电路，连接于所述第一功率开关与所述第二功率开关，用于接收所述驱动电路单元输入的所述高电平或低电平信号，并根据所述高电平或低电平信号驱动所述第一功率开关和所述第二功率开关交替地导通。
  8. 根据权利要求7所述的背光模块，其特征在于：所述第一功率开关为P沟道金属氧化物半导体晶体管，所述第二功率开关为N沟道金属氧化物半导体晶体管。
  9. 根据权利要求7所述的背光模块，其特征在于：所述推挽电路包括第一晶体管和第二晶体管，所述第一晶体管的集极是连接于另一电源，所述第一晶体管的射极是连接于所述第二晶体管的射极，所述第一晶体管的基极是连接于所述驱动电路单元，所述第二晶体管的集极是电性接地，所述第二晶体管的基极是连接于所述驱动电路单元。
  10. 根据权利要求9所述的背光模块，其特征在于：当所述驱动电路单元输出所述高电平的驱动信号至所述推挽电路时，所述第一晶体管为导通状态，所述第一功率开关为导通状态，所述第二功率开关为截止状态，当所述驱动电路单元输出所述低电平的驱动信号至所述推挽电路时，所述第一晶体管为截止状态，所述第一功率开关为截止状态，所述第二功率开关为导通状态。
  11. 一种显示装置，其特征在于：所述显示装置包括：
    显示面板；以及
    背光模块，包括：
    背板；
    多个发光二极管，设置于所述背板上；以及
    驱动电路，电性连接于所述发光二极管，用于驱动所述多个发光二极管，其中所述驱动电路包括：
    第一电感，连接于所述发光二极管与电源之间；
    第二电感，连接于所述多个发光二极管与所述电源之间；
    第一功率开关，连接于所述第一电感与所述发光二极管之间；
    第二功率开关，连接于所述第二电感与所述发光二极管之间；
    驱动电路单元，用于输出一具有高电平及低电平的驱动信号；以及
    推挽电路，连接于所述第一功率开关与所述第二功率开关，用于接收所述驱动电路单元输入的所述高电平或低电平信号，并根据所述高电平或低电平信号驱动所述第一功率开关和所述第二功率开关交替地导通。
  12. 根据权利要求11所述的显示装置，其特征在于：所述第一功率开关为P沟道金属氧化物半导体晶体管，所述第二功率开关为N沟道金属氧化物半导体晶体管。
  13. 根据权利要求11所述的显示装置，其特征在于：所述推挽电路包括第一晶体管和第二晶体管，所述第一晶体管的集极是连接于另一电源，所述第一晶体管的射极是连接于所述第二晶体管的射极，所述第一晶体管的基极是连接于所述驱动电路单元，所述第二晶体管的集极是电性接地，所述第二晶体管的基极是连接于所述驱动电路单元。
  14. 根据权利要求13所述的显示装置，其特征在于：当所述驱动电路单元输出所述高电平的驱动信号至所述推挽电路时，所述第一晶体管为导通状态，所述第一功率开关为导通状态，所述第二功率开关为截止状态，当所述驱动电路单元输出所述低电平的驱动信号至所述推挽电路时，所述第一晶体管为截止状态，所述第一功率开关为截止状态，所述第二功率开关为导通状态。
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