WO2013174119A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

Info

Publication number
WO2013174119A1
WO2013174119A1 PCT/CN2012/085692 CN2012085692W WO2013174119A1 WO 2013174119 A1 WO2013174119 A1 WO 2013174119A1 CN 2012085692 W CN2012085692 W CN 2012085692W WO 2013174119 A1 WO2013174119 A1 WO 2013174119A1
Authority
WO
WIPO (PCT)
Prior art keywords
dimming controller
led light
pulse signal
signal output
backlight module
Prior art date
Application number
PCT/CN2012/085692
Other languages
English (en)
French (fr)
Inventor
李卫海
张亮
张斌
孙志华
侯帅
许益祯
汪建明
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Publication of WO2013174119A1 publication Critical patent/WO2013174119A1/zh

Links

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406Control of illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness

Definitions

  • Embodiments of the present invention relate to a backlight module and a display device. Background technique
  • the existing liquid crystal display usually adopts a light emitting diode (LED) as its backlight, and mainly includes two types of arrangement, an edge light type and a direct type.
  • LED light emitting diode
  • an edge-lit backlight a plurality of LEDs are disposed adjacent to each other in a straight line; and in a direct-lit backlight, a plurality of LEDs are evenly arranged on a single plane.
  • PWM dimming is a dimming technology that uses a simple pulse signal to repeatedly switch the white light LED dimming control switch.
  • the dimming controller system only needs to provide digital pulses of different widths to adjust the brightness of the white LEDs.
  • the advantage of PWM dimming is that it provides high quality white light with simple application and high efficiency.
  • Embodiments of the present invention provide a backlight module and a display device capable of reducing electromagnetic interference of a backlight circuit and improving efficiency of backlight driving.
  • One aspect of the present invention provides a backlight module including a plurality of LED strips, a plurality of transistor switches, a backlight driver, and a dimming controller, wherein
  • Each of the plurality of LED strips includes a positive pole and a negative pole
  • Each of the plurality of transistor switches is electrically coupled to one of the plurality of LED strips, each of the transistor switches including a gate, a source, and a drain, wherein a gate of each of the transistor switches is electrically connected to a pulse signal output end of the dimming controller, and a source of each of the transistor switches is electrically connected to a negative electrode of a corresponding LED strip, each of the The drain of the transistor switch is electrically connected to a common end of the backlight driver;
  • the backlight driver is configured to be coupled to a positive pole of the plurality of LED strips and a dimming controller to provide power to the LED strip and the dimming controller;
  • the dimming controller is configured to receive a timing signal input from the outside, and process the timing signal to output to a transistor switch to control an on-time and an off-time of the transistor switch, the dimming controller comprising:
  • control signal receiving end configured to receive a timing signal of an external input
  • each pulse signal output end being electrically connected to one of the LED strips through a corresponding transistor switch;
  • a processing unit configured to output a pulse signal from the pulse signal output end after processing the received timing signal
  • the signal output by the dimming controller is: [ ⁇ / ⁇ ] the pulse signal output end outputs a pulse width modulation signal with a duty ratio of 1, and one of the pulse signal output ends outputs a pulse width modulation signal having a space ratio of ( ⁇ ⁇ - [ ⁇ / ⁇ ]), and the other pulse signal output terminal does not output a pulse width modulation signal,
  • is the target brightness
  • is the maximum brightness that each LED strip can provide
  • [ ⁇ / ⁇ ] represents the integer part of ⁇ ⁇ .
  • the transistor switch is a metal oxide semiconductor field effect transistor.
  • the power supply and dimming controller are located on the same printed circuit board.
  • the backlight driver outputs a continuous current.
  • Another aspect of the present invention provides a display device including any of the backlight modules described above.
  • FIG. 1 is a schematic diagram of a backlight module in accordance with an embodiment of the present invention. detailed description
  • FIG. 1 shows a backlight module including a plurality of LED strips 8, a plurality of transistor switches, a backlight driver 6, and a dimming controller 5, in accordance with an exemplary embodiment of the present invention.
  • each of the plurality of LED strips includes a positive electrode and a negative electrode, and the oblique arrows shown in the figure indicate LED illumination.
  • Each of the plurality of transistor switches is electrically connected to one of the plurality of LED strips, and each of the transistor switches includes a gate, a source and a drain, wherein a gate of each of the transistor switches is respectively A pulse signal output end of the dimming controller 5 is electrically connected, and a source of each transistor switch is electrically connected to a negative electrode of a corresponding LED strip, and a drain of each transistor switch is electrically connected to a common end of the power source.
  • the backlight driver 6 is configured to be electrically connected to the anode of the plurality of LED strips and the dimming controller 5 to provide power to the LED strip and the dimming controller 5, the backlight driver 6 being capable of providing a matching voltage to the LED strip And current.
  • the dimming controller 5 is configured to receive an externally input timing signal, such as a timing signal obtained from Tcom, and process the timing signal to output to each transistor switch to control an on time and an off time of each transistor switch.
  • the dimming controller 5 includes a control signal receiving end, a plurality of pulse signal output ends, and a processing unit, wherein: the control signal receiving end receives the external input timing signal; and the plurality of pulse signal output ends each pulse signal output end passes the corresponding transistor
  • the switch is electrically connected to one of the plurality of LED strips; the processing unit outputs the pulse signal from the pulse signal output after processing the received timing signal.
  • the signal output by the processing unit of the dimming controller 5 is: a pulse width modulation signal having a duty ratio of 1 outputted by [ ⁇ ⁇ ] pulse signal output terminals, and an output duty ratio of one pulse signal output terminal is ( ⁇ / ⁇ -[ ⁇ / ⁇ ]) pulse width modulation signal, other pulse signal output terminals do not output pulse width modulation signals;
  • is the target brightness
  • is the maximum brightness that each LED strip can provide
  • [ ⁇ / ⁇ ] represents the integer part of ⁇ / ⁇ .
  • the backlight module is shown to include four LED strips. However, this is not limitative, and the backlight module can include any number of LED strips.
  • transistor switches T1, ⁇ 2, ⁇ 3, ⁇ 4 are provided which are electrically connected to the four LED strips, respectively.
  • Transistor switches Tl > ⁇ 2, ⁇ 3, and ⁇ 4 are metal-oxide-semiconductor field-transistors (MOSFETs).
  • MOSFETs metal-oxide-semiconductor field-transistors
  • transistor switches T1, ⁇ 2, ⁇ 3, ⁇ 4 may be of any other type of transistor.
  • the dimming controller 5 generates PWM signals of different duty ratios according to the brightness of the panel to be controlled to control the on and off of the transistors T1, ⁇ 2, ⁇ 3, ⁇ 4, thereby controlling the backlight illumination. The strength is such that it matches the picture.
  • the transistor switches T1, ⁇ 2, ⁇ 3, and ⁇ 4 [ ⁇ / ⁇ ] MOSFETs are in an on state, one MOSFET is in a switching state with a duty ratio of ⁇ ⁇ -[ ⁇ ⁇ ], and the other MOSFETs are in an off state. .
  • the dimming controller 5 has [1.5B/B] outputs with a signal output duty ratio of 1, and one output output duty ratio is ( 1.5BB -[1.5BB]), other outputs do not output signals. That is, one MOSFET is in an on state, the LED strip connected to the MOSFET is energized, and one MOSFET receives a pulse signal with a duty ratio of 0.5, and the LED strip connected to the MOSFET is energized and de-energized. In the alternating state, the other LED strips are not energized.
  • the dimming controller has [3.3 ⁇ / ⁇ ] outputs with a signal output duty ratio of 1, and one output has an output duty ratio of ( 3.3 ⁇ ⁇ -[3.3 ⁇ / ⁇ ]), that is, three MOSFETs are in the on state, the LED strip connected to the MOSFET is energized, and one MOSFET receives a pulse signal with a duty ratio of 0.3, and The LED strips to which the MOSFETs are connected are in an alternating state of energization and non-energization.
  • the backlight module provided by the embodiment of the invention can reduce the electromagnetic interference of the backlight circuit and improve the efficiency of the backlight driving.
  • the transistor switch may be, for example, a metal oxide semiconductor field effect transistor.
  • the power supply and dimming controller can be on the same printed circuit board.
  • the backlight driver can output a continuous current. Since the backlight driver can output a continuous current, the electromagnetic interference generated by the backlight module can be effectively reduced, and the charging current of the current output terminal in the dimming state is also reduced correspondingly, thereby further reducing power consumption and improving efficiency.
  • a display device including the above backlight module is provided.
  • the display device can reduce the electromagnetic interference phenomenon of the backlight circuit and can improve the efficiency of the backlight driving.

Abstract

一种背光模组及显示装置,其能够减小背光电路的电磁干扰,提高背光源驱动器(6)的效率。该背光模组包括:多个LED灯条(8)、多个晶体管开关、背光源驱动器(6)、调光控制器(5)。

Description

背光模组及显示装置 技术领域
本发明的实施例涉及一种背光模组及显示装置。 背景技术
现有的液晶显示器通常采用发光二极管( Light Emitting Diode, 即 LED ) 作为其背光源,主要包括侧光式和直下式两种布置形式。在侧光式背光源中, 多个 LED相邻设置在一条直线上; 而在直下式背光源中, 多个 LED均匀排 布在一个平面上。
当前, LED背光源驱动中大多采用 PWM调光(pulso width modulation dimming ) 的方式, PWM调光是一种利用简单的脉冲信号, 反复开关白光 LED 调光控制开关的调光技术。调光控制器系统只需要提供不同宽度的数字 式脉冲, 即可调节白光 LED 的亮度。 PWM调光的优点在于能够提供高质 量的白光, 且应用简单, 效率高。
但是现行的 PWM调光在调光时 LED调光控制开关工作在非连续状态, 在控制开关同时处于截止状态时便会使背光源驱动器停止向 LED提供驱动 电流, 从而使得背光源驱动器的输出电流不连续, 这样便会产生严重的电磁 干扰 ( electro magnetic interference, EMI ) 问题, 而且会降低 LED背光源 驱动器的效率。 发明内容
本发明的实施例提供了一种背光模组及显示装置, 其能够减小背光电路 的电磁干扰, 并提高背光驱动的效率。
本发明的一个方面提供了一种背光模組, 包括多个 LED灯条、多个晶体 管开关、 背光源驱动器和调光控制器, 其中
所述多个 LED灯条中的每个 LED灯条包括正极和负极;
所述多个晶体管开关中的每个晶体管开关电连接到所述多个 LED 灯条 中的一个对应 LED灯条, 每个所述晶体管开关包括栅极、 源极和漏极, 其中 每个所述晶体管开关的栅极分別与所述调光控制器的一脉冲信号输出端电连 接,每个所述晶体管开关的源极与对应的 LED灯条的负极电连接,每个所述 晶体管开关的漏极与背光源驱动器的公共端电连接;
所述背光源驱动器构造成与所述多个 LED 灯条的正极和调光控制器连 接, 以为所述 LED灯条和调光控制器提供电源;
所述调光控制器构造成接收从外部输入的时序信号, 并对所述时序信号 处理后输出至晶体管开关, 以控制晶体管开关的导通时间和关断时间, 该调 光控制器包括:
控制信号接收端, 构造成接收外部输入的时序信号;
多个脉冲信号输出端, 每个脉冲信号输出端通过一个对应的晶体管开关 与所述 LED灯条中的一个 LED灯条电连接; 和
处理单元, 构造成对接收到的时序信号进行处理后, 从所述脉沖信号输 出端输出脉冲信号;
其中, 所述调光控制器处理后输出的信号为: 有 [ω/Β]个所述脉沖信号输 出端输出占空比为 1的脉沖宽度调制信号, 1个所述脉沖信号输出端输出占 空比为(ω Β-[ω/Β] )的脉冲宽度调制信号, 其它所述脉冲信号输出端不输出 脉冲宽度调制信号,
其中, ω为目标亮度, Β为每个 LED灯条能够提供的最大亮度, [ω/Β] 表示 ω Β的整数部分。
在本发明的一个实施例中, 例如所述晶体管开关为金属氧化物半导体场 效应晶体管。
在本发明的另一个实施例中, 例如所述电源和调光控制器位于同一块印 制电路板上。
在本发明的又一个实施例中, 例如所述背光源驱动器输出连续电流。 本发明的另一方面提供了一种显示装置, 包括上述的任一背光模组。 附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对实施例的附图作 简单地介绍,显而易见地,下面描述中的附图仅仅涉及本发明的一些实施例, 而非对本发明的限制。 图 1为根据本发明的一个实施例的背光模组的示意图。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本发 明实施例的附图 ,对本发明实施例的技术方案进行清楚、完整地描述。显然, 所描述的实施例是本发明的一部分实施例, 而不是全部的实施例。 基于所描 述的本发明的实施例, 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例, 都属于本发明保护的范围。
图 1示出了根据本发明的一个示例性的实施例的背光模组, 其包括多个 LED灯条 8、 多个晶体管开关、 背光源驱动器 6和调光控制器 5。
在该实施例的背光模组中, 多个 LED灯条中的每个 LED灯条包括正极 和负极, 图中所示的斜箭头表示 LED发光。
多个晶体管开关中的各晶体管开关分别与多个 LED灯条中的一个对应 LED灯条电连接, 每个晶体管开关包括栅极、 源极和漏极, 其中每个晶体管 开关的栅极分别与调光控制器 5的一脉沖信号输出端电连接, 每个晶体管开 关的源极分别与一对应的 LED灯条的负极电连接,每个晶体管开关的漏极与 电源的公共端电连接。
背光源驱动器 6构造成与多个 LED灯条的正极和调光控制器 5电连接, 以为 LED灯条和调光控制器 5提供电源, 该背光驱动器 6能够为 LED灯条 提供相匹配的电压和电流。
调光控制器 5构造成接收外部输入的时序信号, 例如从 Tcom获得的时 序信号, 并对该时序信号处理后输出至各晶体管开关, 以控制各晶体管开关 的导通时间和关断时间, 该调光控制器 5包括控制信号接收端、 多个脉冲信 号输出端和处理单元, 其中: 控制信号接收端接收外部输入的时序信号; 多 个脉冲信号输出端每个脉冲信号输出端通过对应的晶体管开关电连接到多个 LED灯条中的一个对应 LED灯条; 处理单元对接收到的时序信号进行处理 后, 从脉冲信号输出端输出脉冲信号。 调光控制器 5的处理单元处理后输出的信号为:有 [ω Β]个脉沖信号输出 端输出占空比为 1的脉冲宽度调制信号, 1个脉冲信号输出端输出占空比为 ( ω/Β-[ω/Β] )的脉沖宽度调制信号, 其它脉沖信号输出端不输出脉沖宽度调 制信号;
其中, ω为目标亮度, Β为每个 LED灯条能够提供的最大亮度, [ω/Β] 表示 ω/Β的整数部分。
在图 1所示的实施例中,该背光模组示出为包括 4个 LED灯条。不过这 不是限制性的, 背光模组可以包括任意个 LED灯条。
在该实施例中,设置有分别与该 4个 LED灯条电连接的四个晶体管开关 Tl、 Τ2、 Τ3、 Τ4。 晶体管开关 Tl > Τ2、 Τ3、 Τ4为金属氧化物半导体场效应 晶体管 ( metal-oxide-semiconductor field-transistor, MOSFET ) 。 然而, 在 替代实施例中, 晶体管开关 Tl、 Τ2、 Τ3、 Τ4也可以采用任意其它类型的晶 体管。
晶体管开关 Tl、 Τ2、 Τ3、 Τ4、 调光控制器 ( dimming controller ) 5、 背 光源驱动器(LED driver ) 6 、 输出电流 7、 背光源(采用 LED灯条, LED bar ) 8一起构成了该背光模组。 调光控制器 5根据所要控制的面板 (panel) 显示画面的明暗程度, 产生出不同占空比的 PWM信号, 以控制晶体管 Tl、 Τ2、 Τ3、 Τ4 的导通和截止, 从而控制背光源发光的强度以使得它能够与画 面相匹配。 其中在晶体管开关 Tl、 Τ2、 Τ3、 Τ4中, 有 [ω/Β]个 MOSFET处 于导通状态, 1 个 MOSFET 处于占空比为 ω Β -[ω Β]的开关状态, 其它 MOSFET处于截止状态。
例如, 假设要获得的目标亮度 ω为 1.5B时, 则调光控制器 5有 [1.5B/B] 个输出端输出占空比为 1 的信号, 有 1 个输出端输出占空比为(1.5B B -[1.5B B]), 其它输出端不输出信号。 即有一个 MOSFET处于导通状态, 与 该 MOSFET相连接的 LED灯条处于通电状态,有一个 MOSFET接收到占空 比为 0.5的脉冲信号, 与该 MOSFET相连接的 LED灯条处于通电和不通电 交替的状态, 其它 LED灯条处于不通电状态。
再例如, 假设要获得的目标亮度 ω为 3.3Β时, 则调光控制器有 [3.3Β/Β] 个输出端输出占空比为 1 的信号, 有 1 个输出端输出占空比为(3.3Β Β -[3.3Β/Β]), 即有 3个 MOSFET处于导通状态, 与该 MOSFET相连接的 LED 灯条处于通电状态, 有一个 MOSFET接收到占空比为 0.3的脉冲信号, 与该 MOSFET相连接的 LED灯条处于通电和不通电交替的状态。 本发明的实施例所提供的背光模组能够减小背光电路的电磁干扰, 并提 高背光驱动的效率。
在该实施例的背光模组中, 晶体管开关例如可以为金属氧化物半导体场 效应晶体管。
此外 , 电源和调光控制器可以位于同一块印制电路板上。
背光源驱动器可以输出连续的电流。 由于背光源驱动器可以输出连续的 电流, 因而能够有效地降低背光模组产生的电磁干扰, 并且在调光状态驱动 电流输出端的充电电流也会相应减小, 进一步的降低电能消耗、 提高效率。
在本发明的另一个实施例中,提供了一种包括上述背光模组的显示装置。 该显示装置能够减小背光电路电磁干扰现象, 并能够提高背光驱动的效率。
本领域普通技术人员可以理解: 实现上述方法实施例的全部或部分步骤 可以通过程序指令相关的硬件来完成, 前述的程序可以存储于一计算机可读 取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述 的存储介质包括: ROM、 RAM, 磁碟或者光盘等各种可以存储程序代码的 介质。 以上说明对本发明而言只是说明性的, 而非限制性的, 本领域普通技 术人员理解, 在不脱离所附权利要求所限定的精神和范围的情况下, 可做出 许多修改、 变化或等效替代, 但都将落入本发明的保护范围内。

Claims

权利要求书
1、一种背光模组, 所述背光模组包括多个 LED灯条、 多个晶体管开关、 背光源驱动器和调光控制器, 其中
所述多个 LED灯条中的每个所述 LED灯条包括正极和负极;
所述多个晶体管开关中的每个晶体管开关电连接到所述多个 LED 灯条 中的一个对应 LED灯条, 每个所述晶体管开关包括栅极、 源极、 漏极, 其中 每个所述晶体管开关的栅极分別与所述调光控制器的一脉冲信号输出端电连 接,每个所述晶体管开关的源极与对应的 LED灯条的负极电连接,每个所述 晶体管开关的漏极与所述背光源驱动器的公共端电连接;
所述背光源驱动器构造成与所述多个 LED 灯条的正极和所述调光控制 器连接, 以为所述 LED灯条和所述调光控制器提供电源;
所述调光控制器构造成接收从外部输入的时序信号, 并对所述时序信号 处理后输出至所述晶体管开关, 以控制所述晶体管开关的导通和关断, 所述 调光控制器包括:
控制信号接收端, 构造成接收从外部输入的时序信号;
多个脉冲信号输出端, 每个脉冲信号输出端通过一个对应的晶体管开关 电连接到所述多个 LED灯条中的一个对应 LED灯条; 和
处理单元, 构造成对接收到的时序信号进行处理后, 从所述脉冲信号输 出端输出脉冲信号;
其中, 所述调光控制器处理后输出的信号为: 有 [ω Β]个所述脉冲信号输 出端输出占空比为 1的脉冲宽度调制信号, 1个所述脉冲信号输出端输出占 空比为(ω/Β-[ω/Β] )的脉冲宽度调制信号, 其它所述脉冲信号输出端不输出 脉冲宽度调制信号,
其中, ω为目标亮度, Β为每个 LED灯条能够提供的最大亮度, [ω/Β] 表示 ω Β的整数部分。
2、根据权利要求 1所述的背光模组, 其特征在于, 所述晶体管开关为金 属氧化物半导体场效应晶体管。
3、根据权利要求 1或 2所述的背光模组, 其特征在于, 所述电源和所述 调光控制器位于同一块印制电路板上。
4、 根据权利要求 1~3 中任一项所述的背光模组, 其特征在于, 所述背 光源驱动器输出连续电流。
5、 一种显示装置, 其特征在于, 包括权利要求 1~4 中任一项所述的背 光模组。
PCT/CN2012/085692 2012-05-25 2012-11-30 背光模组及显示装置 WO2013174119A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201210167048.2 2012-05-25
CN201210167048.2A CN102705758B (zh) 2012-05-25 2012-05-25 一种背光模组及显示装置

Publications (1)

Publication Number Publication Date
WO2013174119A1 true WO2013174119A1 (zh) 2013-11-28

Family

ID=46898732

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/085692 WO2013174119A1 (zh) 2012-05-25 2012-11-30 背光模组及显示装置

Country Status (2)

Country Link
CN (1) CN102705758B (zh)
WO (1) WO2013174119A1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102705758B (zh) * 2012-05-25 2014-08-13 京东方科技集团股份有限公司 一种背光模组及显示装置
CN104989987B (zh) * 2015-06-19 2018-03-06 武汉华星光电技术有限公司 Led灯条、背光模组以及液晶显示器
CN109493810B (zh) * 2018-12-19 2021-08-03 努比亚技术有限公司 背光亮度调节方法、电源管理芯片、移动终端及存储介质
CN109493811A (zh) * 2018-12-25 2019-03-19 厦门天马微电子有限公司 一种显示装置及其驱动方法
CN111724748B (zh) * 2020-06-28 2021-12-17 上海天马微电子有限公司 发光组件及发光模组

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1924672A (zh) * 2005-08-31 2007-03-07 三星电子株式会社 背光单元、具有该背光单元的显示装置和控制光源的方法
JP2008064886A (ja) * 2006-09-05 2008-03-21 Sharp Corp Led光源装置およびそれを用いた映像表示装置
CN101178874A (zh) * 2006-11-10 2008-05-14 索尼株式会社 背光设备、驱动背光的方法以及彩色图像显示装置
CN101179891A (zh) * 2007-11-01 2008-05-14 京东方科技集团股份有限公司 Led背光源亮度控制装置
CN101231417A (zh) * 2007-01-26 2008-07-30 中华映管股份有限公司 背光模块及其驱动方法
CN102354484A (zh) * 2011-09-20 2012-02-15 深圳市华星光电技术有限公司 Led调光驱动装置、方法及液晶显示器
CN102705758A (zh) * 2012-05-25 2012-10-03 京东方科技集团股份有限公司 一种背光模组及显示装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI348141B (en) * 2006-10-16 2011-09-01 Chunghwa Picture Tubes Ltd Light source driving circuit
KR101002869B1 (ko) * 2009-05-05 2010-12-21 정승일 교류 전원 라인에 조광 제어 신호 변조 전송 방법 및 이를 이용한 엘이디 조명등 조광 제어 구동 장치
TWI430705B (zh) * 2009-09-16 2014-03-11 Novatek Microelectronics Corp 發光二極體的驅動裝置及其驅動方法
KR101644189B1 (ko) * 2009-12-18 2016-08-01 엘지디스플레이 주식회사 액정표시장치 및 그의 디밍 제어방법
CN102316621A (zh) * 2010-06-29 2012-01-11 英飞特光电(杭州)有限公司 一种降低pwm调光电路emi的方法及装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1924672A (zh) * 2005-08-31 2007-03-07 三星电子株式会社 背光单元、具有该背光单元的显示装置和控制光源的方法
JP2008064886A (ja) * 2006-09-05 2008-03-21 Sharp Corp Led光源装置およびそれを用いた映像表示装置
CN101178874A (zh) * 2006-11-10 2008-05-14 索尼株式会社 背光设备、驱动背光的方法以及彩色图像显示装置
CN101231417A (zh) * 2007-01-26 2008-07-30 中华映管股份有限公司 背光模块及其驱动方法
CN101179891A (zh) * 2007-11-01 2008-05-14 京东方科技集团股份有限公司 Led背光源亮度控制装置
CN102354484A (zh) * 2011-09-20 2012-02-15 深圳市华星光电技术有限公司 Led调光驱动装置、方法及液晶显示器
CN102705758A (zh) * 2012-05-25 2012-10-03 京东方科技集团股份有限公司 一种背光模组及显示装置

Also Published As

Publication number Publication date
CN102705758A (zh) 2012-10-03
CN102705758B (zh) 2014-08-13

Similar Documents

Publication Publication Date Title
JP4895898B2 (ja) Ledアレイ駆動装置
KR101236238B1 (ko) 엘이디 백라이트 구동회로
TWI432087B (zh) 用於驅動led單元的裝置
US9125276B2 (en) Backlight unit including first and second driving currents and display apparatus using the same
WO2013174119A1 (zh) 背光模组及显示装置
US8120288B2 (en) Light emitting diode (LED) driving circuit
JP2008186668A (ja) Led駆動回路およびそれを用いた映像表示装置
WO2016101362A1 (zh) 一种背光驱动电路及其驱动方法和液晶显示装置
KR20120114813A (ko) Dc-dc 변환 장치 및 이를 이용한 표시 장치용 광원의 구동 장치
US20130147381A1 (en) Driving circuit and driving method for light emitting diode and display apparatus using the same
GB2524213A (en) Backlight drive board and liquid crystal display
WO2014190579A1 (zh) Led背光驱动电路、液晶显示装置和一种驱动方法
KR20170084191A (ko) 백라이트 유닛 및 그 구동 방법, 액정 디스플레이 장치
US9390657B2 (en) LED driving apparatus, LED driving method and display apparatus using the same
EP2964002A1 (en) Led lamp controller, led lamp and drive method for led lamp
US7791498B2 (en) Apparatus and method for driving LED
TWI604756B (zh) 光源裝置及控制方法
CN110853592A (zh) 显示面板的驱动电路及驱动方法
JP5270795B2 (ja) 電力制御装置、バックライトユニット、および液晶表示装置
TWI452925B (zh) 控制電路以及發光二極體之調光方法
KR101003686B1 (ko) Led 조명 시스템
US20100156775A1 (en) Electronic apparatus and backlight unit for the same
CN109119015B (zh) 栅极驱动电路、电位移转器及显示装置
CN102542981A (zh) 发光二极管的驱动电路与方法及其应用的显示装置
CN102682703B (zh) 显示装置、光源模组与调整显示装置亮度的方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12877509

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC, EPO FORM 1205A DATED 03.02.2015

32PN Ep: public notification in the ep bulletin as address of the adressee cannot be established

Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 12.03.2015)

122 Ep: pct application non-entry in european phase

Ref document number: 12877509

Country of ref document: EP

Kind code of ref document: A1