CN102705758A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
- Publication number
- CN102705758A CN102705758A CN2012101670482A CN201210167048A CN102705758A CN 102705758 A CN102705758 A CN 102705758A CN 2012101670482 A CN2012101670482 A CN 2012101670482A CN 201210167048 A CN201210167048 A CN 201210167048A CN 102705758 A CN102705758 A CN 102705758A
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- CN
- China
- Prior art keywords
- led lamp
- transistor switch
- pulse signal
- backlight
- lamp bar
- 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.)
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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 module backlight and display unit.
Background technology
The 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 the side-light type back light, the adjacent setting of a plurality of LED point-blank; In the direct-light-type backlight, a plurality of LED evenly are arranged on the plane.
Current; During driving, the LED-backlit source adopts PWM dimming (pulso width modulation dimming mostly; The pulse width modulation light modulation) mode, PWM dimming is a kind of simple pulse signal that utilizes, the light regulating technology of switch white light LEDs dimming gauge tap repeatedly.The light adjusting controller system only need provide wide, narrow different digital type pulse, the i.e. brightness of scalable white light LEDs.The advantage of PWM light modulation is high-quality white light can be provided, and uses simply, and efficient is high.
But LED dimming gauge tap is operated in discontinuous state during existing PWM dimming light modulation;, gauge tap just can turn-off the drive current that backlight driver provides to LED when being in cut-off state simultaneously; Thereby make that the output current of backlight driver is discontinuous; So just, serious EMI (electro magnetic interference, electromagnetic interference) problem can be produced, and the efficient of LED-backlit Source drive can be reduced.
Summary of the invention
Embodiments of the invention provide a kind of module backlight and display unit, can reduce the electromagnetic interference of backlight circuit, improve the efficient of backlight drive.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, a kind of module backlight is provided, comprises:
A plurality of LED lamp bars, each said LED lamp bar comprises positive pole, negative pole;
A plurality of transistor switches; Said transistor switch is corresponding one by one with said LED lamp bar; Each said transistor switch comprises grid, source electrode, drain electrode; Wherein the grid of each said transistor switch is electrically connected with a pulse signal output end of said light adjusting controller respectively, and the source electrode of each said transistor switch or drain electrode are connected with the negative electricity of a said LED lamp bar, and the drain electrode of each said transistor switch or source electrode are electrically connected with the common port of backlight driver;
Backlight driver is connected with light adjusting controller with the positive pole of said a plurality of LED lamp bars, for said LED lamp bar and light adjusting controller provide power supply;
Light adjusting controller receives the clock signal of outside input, and to exporting transistor switch to after the said control signal processing, the ON time and the turn-off time of control transistor switch, comprising:
The control signal receiving terminal receives the outside clock signal of importing;
A plurality of pulse signal output ends, said pulse signal output end is corresponding one by one with LED lamp bar, and is electrically connected with transistor switch;
Processing unit is after the clock signal that receives handled, from said pulse signal output end output pulse signal;
The signal that said light adjusting controller is handled back output is: it is 1 pulse width modulating signal that [ω/B] individual said pulse signal output end output duty cycle is arranged; 1 said pulse signal output end output duty cycle is the pulse width modulating signal of (ω/B-[ω/B]); Other said pulse signal output end is the output pulse width modulation signal not
Wherein, ω is an object brightness, the high-high brightness that B can provide for each LED lamp bar, and [] expression rounds.
Said transistor switch is a mos field effect transistor.
Said power supply and light adjusting controller are positioned on the same printed circuit board.
Said backlight driver output continuous current.
On the one hand, a kind of display unit is provided, comprises above-mentioned module arbitrary backlight.
Module backlight and display unit that the embodiment of the invention provides can reduce the electromagnetic interference of backlight circuit, improve the efficient of backlight drive.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The module sketch map a kind of backlight that Fig. 1 provides for the embodiment of the invention.
The specific embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
As shown in Figure 1, the module a kind of backlight for the embodiment of the invention provides comprises:
A plurality of LED lamp bars, each LED lamp bar comprises positive pole, negative pole, oblique arrow representes that LED is luminous among the figure;
A plurality of 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, and 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;
Light adjusting controller 5 receives the outside clock signal of importing, the clock signal that for example obtains from Tcom, and to exporting transistor switch to after this control signal processing, the ON time and the turn-off time of control transistor switch, comprising:
The control signal receiving terminal receives the outside clock signal of importing;
A plurality of 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 is after the clock signal that receives handled, from the pulse signal output end output pulse signal;
The signal that light adjusting controller 5 is handled back output is: it is 1 pulse width modulating signal that [ω/B] individual pulse signal output end output duty cycle is arranged; 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 the output pulse width modulation signal not;
Wherein, ω is an object brightness, the high-high brightness that B can provide for each LED lamp bar, and [] expression rounds.
The module backlight that the embodiment of the invention provides can reduce the electromagnetic interference of backlight circuit, improves the efficient of backlight drive.
Further, transistor is a mos field effect transistor; This external power and light adjusting controller are positioned on the same printed circuit board; Backlight driver output continuous current; Because the electric current that backlight driver output is continuous has reduced the electromagnetic interference that module backlight produces effectively, 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 with this module backlight 4 LED lamp bars are example; This module backlight 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 compositions module backlight.Light adjusting controller (dimming controller) 5 bright-dark degrees according to current panel display frame; Produce the pwm signal of different duty; The conducting of control T1, T2, T3, T4 and ending, thus the luminous intensity of control backlight make its can and picture be complementary.Wherein among T1, T2, T3, the T4, have [ω/B] individual MOSFET to be in conducting state, 1 MOSFET is in the on off state that dutycycle is ω/B-[ω/B], and other MOSFET is in cut-off state; Wherein, ω is an object brightness, the high-high brightness that B can provide for each LED lamp bar, and [] expression rounds.
When supposing that the object brightness that will obtain is 1.5B, then [1.5B/B] individual output output duty cycle is arranged is 1 signal to light adjusting controller, has 1 output output duty cycle to be (1.5B/B-[1.5B/B]), and other output is not exported signal.Promptly there is a MOSFET to be in conducting state; The LED lamp bar that is connected with this MOSFET is in "on" position; Having a MOSFET to receive dutycycle is 0.5 pulse signal; The LED lamp bar that is connected with this MOSFET is in energising and the state that replaces of no power, and other LED lamp bar is in the no power state.
When supposing that the object brightness that will obtain is 3.3B; Then [3.3B/B] individual output output duty cycle is arranged is 1 signal to light adjusting controller; Have 1 output output duty cycle to be (3.3B/B-[3.3B/B]), promptly have 3 MOSFET to be in conducting state, the LED lamp bar that is connected with this MOSFET is in "on" position; Having a MOSFET to receive dutycycle is 0.3 pulse signal, and the LED lamp bar that is connected with this MOSFET is in the state that energising and no power replace.
Being that example describes with four transistor switches just more than, can certainly be the LED bar of greater number, and coupled transistor switch.
The embodiment of the invention provides a kind of display unit, comprises above-mentioned module backlight.
The display unit that the embodiment of the invention provides can reduce backlight circuit electromagnetic interference phenomenon, improves the efficient of backlight drive.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of programmed instruction; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above; Be merely the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of said claim.
Claims (5)
1. a module backlight is characterized in that, comprising:
A plurality of LED lamp bars, each said LED lamp bar comprises positive pole, negative pole;
A plurality of transistor switches; Said transistor switch is corresponding one by one with said LED lamp bar; Each said transistor switch comprises grid, source electrode, drain electrode; Wherein the grid of each said transistor switch is electrically connected with a pulse signal output end of said light adjusting controller respectively, and the source electrode of each said transistor switch or drain electrode are connected with the negative electricity of a said LED lamp bar, and the drain electrode of each said transistor switch or source electrode are electrically connected with the common port of backlight driver;
Backlight driver is connected with light adjusting controller with the positive pole of said a plurality of LED lamp bars, for said LED lamp bar and light adjusting controller provide power supply;
Light adjusting controller receives the clock signal of outside input, and to exporting transistor switch to after the said clock signal processing, controls the conducting and the shutoff of transistor switch, comprising:
The control signal receiving terminal receives the outside clock signal of importing;
A plurality of pulse signal output ends, said pulse signal output end is corresponding one by one with LED lamp bar, and is electrically connected with transistor switch;
Processing unit is after the clock signal that receives handled, from said pulse signal output end output pulse signal;
The signal that said light adjusting controller is handled back output is: it is 1 pulse width modulating signal that [ω/B] individual said pulse signal output end output duty cycle is arranged; 1 said pulse signal output end output duty cycle is the pulse width modulating signal of (ω/B-[ω/B]); Other said pulse signal output end is the output pulse width modulation signal not
Wherein, ω is an object brightness, the high-high brightness that B can provide for each LED lamp bar, and [] expression rounds.
2. module backlight according to claim 1 is characterized in that, said transistor switch is a mos field effect transistor.
3. module backlight according to claim 1 is characterized in that, said power supply and light adjusting controller are positioned on the same printed circuit board.
4. according to the described module backlight of claim 1～3, it is characterized in that said backlight driver output continuous current.
5. a display unit is characterized in that, comprises the described module backlight of claim 1～4.
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 true CN102705758A (en) | 2012-10-03 |
| CN102705758B CN102705758B (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210167048.2A Active 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) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013174119A1 (en) * | 2012-05-25 | 2013-11-28 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN104989987A (en) * | 2015-06-19 | 2015-10-21 | 武汉华星光电技术有限公司 | LED light bar, backlight module and liquid crystal display |
| 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 |
| CN109493810A (en) * | 2018-12-19 | 2019-03-19 | 努比亚技术有限公司 | Back light brightness regulating method, power management chip, mobile terminal and storage medium |
| CN111724748A (en) * | 2020-06-28 | 2020-09-29 | 上海天马微电子有限公司 | Light-emitting component and light-emitting module |
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| KR20100120254A (en) * | 2009-05-05 | 2010-11-15 | 정승일 | The modulation transmission method for dimming control signal only with ac power line and its dimmable led lighnting systems |
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| CN104989987A (en) * | 2015-06-19 | 2015-10-21 | 武汉华星光电技术有限公司 | LED light bar, backlight module and liquid crystal display |
| CN109493810A (en) * | 2018-12-19 | 2019-03-19 | 努比亚技术有限公司 | Back light brightness regulating method, power management chip, mobile terminal and storage medium |
| 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 |
| CN111724748A (en) * | 2020-06-28 | 2020-09-29 | 上海天马微电子有限公司 | Light-emitting component and light-emitting module |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102705758B (en) | 2014-08-13 |
| WO2013174119A1 (en) | 2013-11-28 |
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