CN102705758B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
- Publication number
- CN102705758B CN102705758B CN201210167048.2A CN201210167048A CN102705758B CN 102705758 B CN102705758 B CN 102705758B CN 201210167048 A CN201210167048 A CN 201210167048A CN 102705758 B CN102705758 B CN 102705758B
- Authority
- CN
- China
- Prior art keywords
- led lamp
- transistor switch
- pulse signal
- lamp bar
- light adjusting
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
- 230000005669 field effect Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 208000032365 Electromagnetic interference Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The embodiment of the invention provides a backlight module and a display device, which can reduce electromagnetic interference of a backlight circuit and increase efficiency of a backlight source driver. The circuit comprises a plurality of LED (light-emitting diode) lamp bars, a plurality of crystal switches, the backlight source driver and a dimming controller. The embodiment of the invention is used for manufacturing displays.
Description
Technical field
The present invention relates to art of display device manufacture, relate in particular to a kind of backlight module and display unit.
Background technology
Available liquid crystal display can adopt light emitting diode, and (Light Emitting Diode is called for short: LED) as its backlight, mainly comprise two kinds of side-light type and straight-down negatives.Existing LED-backlit source is a kind of spot light, and in side-light type back light, the adjacent setting of multiple LED point-blank; In direct-light-type backlight, multiple LED evenly arrange in one plane.
Current, during driving, LED-backlit source mostly adopts PWM dimming (pulso width modulation dimming, pulse width modulation light modulation) mode, PWM dimming is that one is utilized simple pulse signal, repeatedly the light regulating technology of switch white light LEDs dimming gauge tap.Light adjusting controller system only need to provide wide, narrow different digital type pulse, the i.e. brightness of adjustable white light LEDs.The advantage of PWM light modulation is to provide high-quality white light, and application is simple, and efficiency is high.
But when existing PWM dimming light modulation, LED dimming gauge tap is operated in discontinuous state, just can turn-off the drive current that backlight driver provides to LED during simultaneously in cut-off state at gauge tap, thereby make the output current of backlight driver discontinuous, so just, can produce serious EMI (electro magnetic interference, electromagnetic interference) problem, and can reduce the efficiency of LED-backlit Source drive.
Summary of the invention
Embodiments of the invention provide a kind of backlight module and display unit, can reduce the electromagnetic interference of backlight circuit, improve the efficiency of backlight drive.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, provide a kind of backlight module, comprising:
Multiple LED lamp bars, each described LED lamp bar comprises positive pole, negative pole;
Multiple transistor switches, described transistor switch is corresponding one by one with described LED lamp bar, each described transistor switch comprises grid, source electrode, drain electrode, wherein the grid of each described transistor switch is electrically connected with a pulse signal output end of described light adjusting controller respectively, the source electrode of each described transistor switch or drain electrode are connected with the negative electricity of LED lamp bar described in, and the drain electrode of each described transistor switch or source electrode are electrically connected with the common port of backlight driver;
Backlight driver, is connected with positive pole and the light adjusting controller of described multiple LED lamp bars, for described LED lamp bar and light adjusting controller provide power supply;
Light adjusting controller, receives the clock signal of outside input, and exports transistor switch to after described control signal is processed, and controls ON time and the turn-off time of transistor switch, comprising:
Control signal receiving terminal, receives the outside clock signal of inputting;
Multiple pulse signal output ends, described pulse signal output end is corresponding one by one with LED lamp bar, and is electrically connected with transistor switch;
Processing unit, after processing the clock signal receiving, from described pulse signal output end output pulse signal;
The signal that described light adjusting controller is exported after processing is: have the pulse width modulating signal that [ω/B] individual described pulse signal output end output duty cycle is 1,1 described pulse signal output end output duty cycle is the pulse width modulating signal of (ω/B-[ω/B]), not output pulse width modulation signal of pulse signal output end described in other
Wherein, ω is object brightness, the high-high brightness that B can provide for each LED lamp bar, and [] represents to round.
Described transistor switch is mos field effect transistor.
Described power supply and light adjusting controller are positioned on same printed circuit board.
Described backlight driver output continuous stream.
On the one hand, provide a kind of display unit, comprise above-mentioned arbitrary backlight module.
The backlight module that the embodiment of the present invention provides and display unit, can reduce the electromagnetic interference of backlight circuit, improves the efficiency of backlight drive.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
A kind of backlight module schematic diagram that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, be a kind of backlight module that the embodiment of the present invention provides, comprising:
Multiple LED lamp bars, each LED lamp bar comprises positive pole, negative pole, in figure, tiltedly arrow represents that LED is luminous;
Multiple transistor switches, transistor switch is corresponding one by one with LED lamp bar, each transistor switch comprises grid, source electrode, drain electrode, wherein the grid of each transistor switch is electrically connected with a pulse signal output end of light adjusting controller 5 respectively, the source electrode of each transistor switch is connected with the negative electricity of a LED lamp bar respectively, and the drain electrode of each transistor switch is electrically connected with the common port of power supply;
Backlight driver 6, is connected with positive pole and the light adjusting controller of multiple LED lamp bars, and for LED lamp bar and light adjusting controller 5 provide power supply, backlight driver can provide the voltage and current matching for LED lamp bar;
Light adjusting controller 5, receives the outside clock signal of inputting, the clock signal for example obtaining from Tcom, and export transistor switch to after this control signal is processed, and control ON time and the turn-off time of transistor switch, comprising:
Control signal receiving terminal, receives the outside clock signal of inputting;
Multiple pulse signal output ends, pulse signal output end is corresponding one by one with LED lamp bar, and is electrically connected with transistor switch;
Processing unit, after processing the clock signal receiving, from pulse signal output end output pulse signal;
The signal that light adjusting controller 5 is exported after processing is: have the pulse width modulating signal that [ω/B] individual pulse signal output end output duty cycle is 1,1 pulse signal output end output duty cycle is the pulse width modulating signal of (ω/B-[ω/B]), and other pulse signal output end is output pulse width modulation signal not;
Wherein, ω is object brightness, the high-high brightness that B can provide for each LED lamp bar, and [] represents to round.
The backlight module that the embodiment of the present invention provides, can reduce the electromagnetic interference of backlight circuit, improves the efficiency of backlight drive.
Further, transistor is mos field effect transistor; This external power and light adjusting controller are positioned on same printed circuit board; Backlight driver output continuous stream; Because backlight driver is exported continuous electric current, effectively reduce the electromagnetic interference that backlight module produces, the charging current of this external dimming state drive current output also can correspondingly reduce, and further reduces power consumption and raises the efficiency.
Concrete comprises that taking this backlight module 4 LED lamp bars are as example, this backlight module adopts MOSFET (metal-oxide-semiconductor field-transistor, mos field effect transistor) T1, T2, T3, T4, light adjusting controller (dimming controller) 5, backlight driver (LED driver) 6, output current 7, backlight (adopting LED lamp bar, LED bar) 8 common composition backlight modules.Light adjusting controller (dimming controller) 5 is according to the bright-dark degree of current panel display frame, produce the pwm signal of different duty, control conducting and the cut-off of T1, T2, T3, T4, thus control backlight send out light intensity make its can and picture match.Wherein, in T1, T2, T3, T4, have [ω/B] individual MOSFET in conducting state, 1 MOSFET is ω/B-[ω/B in dutycycle] on off state, other MOSFET is in cut-off state; Wherein, ω is object brightness, the high-high brightness that B can provide for each LED lamp bar, and [] represents to round.
While supposing that the object brightness that will obtain is 1.5B, light adjusting controller has the signal that [1.5B/B] individual output output duty cycle is 1, has 1 output output duty cycle for (1.5B/B-[1.5B/B]), not output signal of other output.There is a MOSFET in conducting state, the LED lamp bar being connected with this MOSFET is in "on" position, having a MOSFET to receive dutycycle is 0.5 pulse signal, the LED lamp bar being connected with this MOSFET is in the state of switching on and no power replaces, and other LED lamp bar is in no power state.
While supposing that the object brightness that will obtain is 3.3B, light adjusting controller has the signal that [3.3B/B] individual output output duty cycle is 1, there is 1 output output duty cycle for (3.3B/B-[3.3B/B]), there are 3 MOSFET in conducting state, the LED lamp bar being connected with this MOSFET is in "on" position, having a MOSFET to receive dutycycle is 0.3 pulse signal, the state that the LED lamp bar being connected with this MOSFET replaces in energising and no power.
More than just describing as an example of four transistor switches example, can certainly be the LED bar of greater number, and coupled transistor switch.
The embodiment of the present invention provides a kind of display unit, comprises above-mentioned backlight module.
The display unit that the embodiment of the present invention provides, can reduce backlight circuit electromagnetic interference phenomenon, improves the efficiency of backlight drive.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of programmed instruction, aforesaid program can be stored in a computer read/write memory medium, this program, in the time carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (5)
1. a backlight module, is characterized in that, comprising:
Multiple LED lamp bars, each described LED lamp bar comprises positive pole, negative pole;
Multiple transistor switches, described transistor switch is corresponding one by one with described LED lamp bar, each described transistor switch comprises grid, source electrode, drain electrode, wherein the grid of each described transistor switch is electrically connected with a pulse signal output end of light adjusting controller respectively, the source electrode of each described transistor switch or drain electrode are connected with the negative electricity of LED lamp bar described in, and the drain electrode of each described transistor switch or source electrode are electrically connected with the common port of backlight driver;
Backlight driver, is connected with positive pole and the light adjusting controller of described multiple LED lamp bars, for described LED lamp bar and light adjusting controller provide power supply;
Light adjusting controller, receives the clock signal of outside input, and exports transistor switch to after described clock signal is processed, and controls the turn-on and turn-off of transistor switch, comprising:
Control signal receiving terminal, receives the outside clock signal of inputting;
Multiple pulse signal output ends, described pulse signal output end is corresponding one by one with LED lamp bar, and is electrically connected with transistor switch;
Processing unit, after processing the clock signal receiving, from described pulse signal output end output pulse signal;
The signal that described light adjusting controller is exported after processing is: have the pulse width modulating signal that [ω/B] individual described pulse signal output end output duty cycle is 1,1 described pulse signal output end output duty cycle is the pulse width modulating signal of (ω/B-[ω/B]), not output pulse width modulation signal of pulse signal output end described in other
Wherein, ω is object brightness, the high-high brightness that B can provide for each LED lamp bar, and [] represents to round.
2. backlight module according to claim 1, is characterized in that, described transistor switch is mos field effect transistor.
3. backlight module according to claim 1, is characterized in that, described power supply and light adjusting controller are positioned on same printed circuit board.
4. according to the backlight module described in claim 1～3 any one, it is characterized in that described backlight driver output continuous stream.
5. a display unit, is characterized in that, comprises the backlight module described in claim 1～4 any one.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210167048.2A CN102705758B (en) | 2012-05-25 | 2012-05-25 | Backlight module and display device |
| PCT/CN2012/085692 WO2013174119A1 (en) | 2012-05-25 | 2012-11-30 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210167048.2A CN102705758B (en) | 2012-05-25 | 2012-05-25 | Backlight module and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102705758A CN102705758A (en) | 2012-10-03 |
| CN102705758B true CN102705758B (en) | 2014-08-13 |
Family
ID=46898732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210167048.2A Expired - Fee Related CN102705758B (en) | 2012-05-25 | 2012-05-25 | Backlight module and display device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102705758B (en) |
| WO (1) | WO2013174119A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705758B (en) * | 2012-05-25 | 2014-08-13 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN104989987B (en) * | 2015-06-19 | 2018-03-06 | 武汉华星光电技术有限公司 | LED light bar, backlight module and liquid crystal display |
| CN109493810B (en) * | 2018-12-19 | 2021-08-03 | 努比亚技术有限公司 | Backlight brightness adjusting method, power management chip, mobile terminal and storage medium |
| CN109493811A (en) * | 2018-12-25 | 2019-03-19 | 厦门天马微电子有限公司 | A kind of display device and its driving method |
| CN111724748B (en) * | 2020-06-28 | 2021-12-17 | 上海天马微电子有限公司 | Light-emitting component and light-emitting module |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070025034A (en) * | 2005-08-31 | 2007-03-08 | 삼성전자주식회사 | Backlight unit and display device having the same |
| JP2008064886A (en) * | 2006-09-05 | 2008-03-21 | Sharp Corp | Led light source apparatus and video display apparatus using the same |
| TWI348141B (en) * | 2006-10-16 | 2011-09-01 | Chunghwa Picture Tubes Ltd | Light source driving circuit |
| JP4264558B2 (en) * | 2006-11-10 | 2009-05-20 | ソニー株式会社 | Backlight device, backlight driving method, and color image display device |
| CN101231417B (en) * | 2007-01-26 | 2010-05-19 | 中华映管股份有限公司 | Backlight module and drive method thereof |
| CN101179891B (en) * | 2007-11-01 | 2011-05-04 | 京东方科技集团股份有限公司 | LED back light source brightness control device |
| KR101002869B1 (en) * | 2009-05-05 | 2010-12-21 | 정승일 | The modulation transmission method for dimming control signal only with AC power line and its dimmable LED lighnting systems |
| TWI430705B (en) * | 2009-09-16 | 2014-03-11 | Novatek Microelectronics Corp | Driving apparatus of light emitted diode and driving method thereof |
| KR101644189B1 (en) * | 2009-12-18 | 2016-08-01 | 엘지디스플레이 주식회사 | Liquid crystal display and dimming controlling method of thereof |
| CN102316621A (en) * | 2010-06-29 | 2012-01-11 | 英飞特光电（杭州）有限公司 | Method and device for reducing EMI (Electro-Magnetic Interference) of PWM (Pulse-Width Modulation) dimming circuit |
| CN102354484B (en) * | 2011-09-20 | 2014-04-30 | 深圳市华星光电技术有限公司 | Light emitting diode (LED) dimming driving device, method and liquid crystal display |
| CN102705758B (en) * | 2012-05-25 | 2014-08-13 | 京东方科技集团股份有限公司 | Backlight module and display device |
-
2012
- 2012-05-25 CN CN201210167048.2A patent/CN102705758B/en not_active Expired - Fee Related
- 2012-11-30 WO PCT/CN2012/085692 patent/WO2013174119A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013174119A1 (en) | 2013-11-28 |
| CN102705758A (en) | 2012-10-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102705758B (en) | Backlight module and display device | |
| CN102629451B (en) | LED (Light Emitting Diode) backlight driving circuit, liquid crystal display device and driving method | |
| EP3396660A1 (en) | Backlight driver control method and system | |
| CN104505030B (en) | A kind of backlight drive circuit and its driving method and liquid crystal display device | |
| CN202949606U (en) | Impulse width modulation dimming circuit | |
| CN101500361A (en) | LED driving apparatus and driving method thereof | |
| CN105513545A (en) | Backlight unit and driving method thereof and display device | |
| CN102781146A (en) | driving circuit of light emitting diode string and driving method thereof | |
| CN103384436A (en) | Light-emitting diode (LED) backlight constant-current circuit | |
| CN106376143B (en) | A kind of circuit of the multiple LED pixel points of single channel constant current drive control | |
| CN203242310U (en) | LED backlight drive circuit and LED liquid crystal screen | |
| AU2014100169A4 (en) | A controlling device for LED decorative lights, a LED light and a controlling method for LED decorative lights | |
| CN201804534U (en) | Light-emitting diode (LED) drive circuit and television having same | |
| CN103533722A (en) | LED dimming lamp device | |
| CN102325401B (en) | LED driving device, lamp strip and backlight device | |
| US20160037601A1 (en) | Backlight device | |
| CN202197355U (en) | Power supply and driving device used for LED backlight and liquid crystal television comprising the same | |
| CN103687222B (en) | Backlight drive circuit and television | |
| CN202524615U (en) | Drive device of light emitting diode | |
| KR101003686B1 (en) | LED illumination system | |
| CN103985359A (en) | Backlight source drive circuit and display device | |
| CN103531147A (en) | LED driving circuit and LED driving system employing driving circuit | |
| CN106658837A (en) | LED driving circuit, LED regulation circuit and LED module | |
| CN107018598B (en) | It is a kind of that address, group, scene and the DALI light modulators for dimming parameter are set | |
| CN203618185U (en) | LED dimming lamp device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 |