WO2013174119A1 - 背光模组及显示装置 - Google Patents
背光模组及显示装置 Download PDFInfo
- 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
Links
- 238000000034 method Methods 0.000 claims description 7
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000005669 field effect Effects 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 238000005286 illumination Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Classifications
-
- 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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment 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
Description
Claims
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 |
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WO2013174119A1 true WO2013174119A1 (zh) | 2013-11-28 |
Family
ID=46898732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/CN2012/085692 WO2013174119A1 (zh) | 2012-05-25 | 2012-11-30 | 背光模组及显示装置 |
Country Status (2)
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CN (1) | CN102705758B (zh) |
WO (1) | WO2013174119A1 (zh) |
Families Citing this family (5)
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 |
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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 |
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KR101644189B1 (ko) * | 2009-12-18 | 2016-08-01 | 엘지디스플레이 주식회사 | 액정표시장치 및 그의 디밍 제어방법 |
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- 2012-05-25 CN CN201210167048.2A patent/CN102705758B/zh active Active
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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 |
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CN102705758A (zh) | 2012-10-03 |
CN102705758B (zh) | 2014-08-13 |
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