CN101193477A - LED light source module and its LCD - Google Patents
LED light source module and its LCD Download PDFInfo
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- CN101193477A CN101193477A CNA2006101628899A CN200610162889A CN101193477A CN 101193477 A CN101193477 A CN 101193477A CN A2006101628899 A CNA2006101628899 A CN A2006101628899A CN 200610162889 A CN200610162889 A CN 200610162889A CN 101193477 A CN101193477 A CN 101193477A
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- voltage
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Abstract
The invention discloses a LED light module which comprises a first primary DC voltage converter, a second primary DC voltage converter, a plurality of first primary LED tandems, a plurality of second primary LED tandems and a plurality of constant current controllers. The first primary DC voltage converter converts the DC voltage into the first primary work voltage and the second primary DC voltage converter converts the DC voltage into the second primary work voltage. The first primary LED tandems receive the first primary work voltage to achieve the preset brightness and the second primary LED tandems receive the second primary work voltage to achieve the preset brightness. The constant current controllers are coupled on various LED tandems respectively for controlling the current flow which passes through the corresponding LED tandems in order to achieve the preset brightness, which can reduce power loss and increase efficiency. .
Description
Technical field
The invention relates to a kind of LED light source module and LCD thereof, and particularly relevant for LED light source module and the LCD thereof of using the dc voltage changer structure of simplifying.
Background technology
Please refer to Fig. 1, it illustrates is the calcspar of traditional backlight module.Traditional module backlight 10 comprises power supply changeover device 11, dc voltage changer 121D～12nD, 131D～13nD and 141D～14nD, red light-emitting diode tandem 121～12n, green light LED tandem 131～13n and blue light-emitting diode tandem 141～14n.Power supply changeover device 11 converts alternating voltage to direct voltage, dc voltage changer 121D～12nD, 131D～13nD and 141D～14nD receive this direct voltage respectively, and convert this direct voltage to operating voltage respectively, then will export corresponding LED serial 121～12n, 131～13n and 141～14n to, make it reach predetermined brightness.
In above-mentioned module backlight 10, a LED serial must be driven by a dc voltage changer.So along with applied panel size is big more, the number of employed LED serial is got over for a long time, then the number of its needed dc voltage changer is just many more.So, will making that the volume of module 10 backlight is big more, production cost also rises thereupon.
Please refer to Fig. 2, it illustrates is another routine calcspar of traditional backlight module.Module 20 backlight comprises power supply changeover device 21, dc voltage changer 22, red light-emitting diode tandem 231～23n, green light LED tandem 241～24n, blue light-emitting diode tandem 251～25n and decides current controller 231C～23nC, 241C～24nC and 251C～25nC.Power supply changeover device 21 converts alternating voltage to direct voltage, and dc voltage changer 22 converts direct voltage to one operating voltage again.LED serial 231～23n, 241～24n and 251～25n all receive this operating voltage, and couple corresponding decide current controller 231C～23nC, 241C～24nC and 251C～25nC separately, to reach predetermined brightness.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of LED light source module and LCD thereof exactly, utilize the dc voltage changer structure of simplifying, make the LED serial of the corresponding different primary colors of dc voltage changer that different voltage is provided, thus, the cross-pressure of deciding current controller that couples with LED serial can reduce to minimum, thus can reduce power loss, and raise the efficiency.
According to purpose of the present invention, propose a kind of LED light source module, comprise the first primary colors dc voltage changer, the second primary colors dc voltage changer, a plurality of first primary colors LED serial, a plurality of second primary colors LED serial and a plurality ofly decide current controller.The first primary colors dc voltage changer converts direct voltage to first primary colors operating voltage, and the second primary colors dc voltage changer converts direct voltage to second primary colors operating voltage.A plurality of first primary colors LED serials receive the first primary colors operating voltage to reach predetermined brightness, and a plurality of second primary colors LED serials receive the second primary colors operating voltage to reach predetermined brightness.A plurality ofly decide current controller and be couple to each LED serial respectively, in order to control size of current by corresponding LED serial respectively to reach predetermined brightness.
According to purpose of the present invention, a kind of LCD is proposed, comprise panel and module backlight.Module backlight comprises the first primary colors dc voltage changer, the second primary colors dc voltage changer, a plurality of first primary colors LED serial, a plurality of second primary colors LED serial and a plurality ofly decides current controller.The first primary colors dc voltage changer converts direct voltage to first primary colors operating voltage, and the second primary colors dc voltage changer converts direct voltage to second primary colors operating voltage.A plurality of first primary colors LED serials receive the first primary colors operating voltage to reach predetermined brightness, and a plurality of second primary colors LED serials receive the second primary colors operating voltage to reach predetermined brightness.A plurality ofly decide current controller and be couple to each LED serial respectively, in order to control size of current by corresponding LED serial respectively to reach predetermined brightness.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below especially exemplified by a preferred embodiment, and cooperate appended graphicly, be described in detail below.
Fig. 1 is the calcspar of traditional backlight module.
Fig. 2 is another routine calcspar of traditional backlight module.
It is calcspar according to the module backlight of one first embodiment of the present invention that Fig. 3 illustrates.
Fig. 4 illustrate be according to the module backlight of one second embodiment of the present invention calcspar.
It is calcspar according to the module backlight of one the 3rd embodiment of the present invention that Fig. 5 illustrates.
It is calcspar according to the module backlight of one the 4th embodiment of the present invention that Fig. 6 illustrates.
It is calcspar according to the module backlight of one the 5th embodiment of the present invention that Fig. 7 illustrates.
The main element symbol description is as follows among the figure:
10,20,30,70: module backlight;
11,21,31: power supply changeover device (A/D);
121D～12nD, 131D～13nD, 141D～14nD, 22: dc voltage changer (D/D);
32: ruddiness dc voltage changer (D/D_R);
33: green glow dc voltage changer (D/D_G);
34: blue light dc voltage changer (D/D_B);
35: brightness regulator (Diming controller);
121～12n, 231～23n, 321～32n, 721～72n: red light-emitting diode tandem (LED_R);
131～13n, 241～24n, 331～33n, 731～73n: green light LED tandem (LED_G);
141～14n, 251～25n, 341～34n, 741～74n: blue light-emitting diode tandem (LED_B);
231C～23nC、241C～24nC、251C～25nC、321C～32nC、331C～33nC、
341C～34nC, 721C～72nC, 731C～73nC, 741C～74nC: decide current controller (CC controller);
72: ruddiness power supply changeover device (A/D_R);
73: green glow power supply changeover device (A/D_G);
74: blue light power supply changeover device (A/D_B).
Embodiment
Now it is that example is done explanation that act has trichromatic module backlight.Please refer to Fig. 3, it illustrates is calcspar according to the module backlight of one first embodiment of the present invention.Module 30 backlight comprises power supply changeover device 31, ruddiness dc voltage changer 32, green glow dc voltage changer 33, blue light dc voltage changer 34, red light-emitting diode tandem 321～32n, green light LED tandem 331～33n, blue light-emitting diode tandem 341～34n and correspondingly decides current controller 321C～32nC, 331C～33nC and 341C～34nC.
Power supply changeover device 31 receives alternating voltages, and alternating voltage is converted to direct voltage, wherein power supply changeover device 31 can comprise a power factor corrector (Power FactorCorrector, PFC).Ruddiness dc voltage changer 32 can comprise decides function of current, it converts direct voltage to the ruddiness operating voltage and exports red light-emitting diode tandem 321～32n to, the forward cross-pressure when this ruddiness operating voltage preferably approximates the conducting of red light-emitting diode tandem.Green glow dc voltage changer 33 can comprise decides function of current, it converts direct voltage to the green glow operating voltage and exports green light LED tandem 331～33n to, the forward cross-pressure when this green glow operating voltage preferably approximates the conducting of green light LED tandem.Blue light dc voltage changer 34 can comprise decides function of current, it converts direct voltage to the blue light operating voltage and exports blue light-emitting diode tandem 341～34n to, the forward cross-pressure when this blue light operating voltage preferably approximates the conducting of blue light-emitting diode tandem.It should be noted that, because single red light-emitting diode, single green light LED, and the cross-pressure during single blue light-emitting diode conducting all different, so make that the forward cross-pressure of LED serial of three kinds of primary colors is all inequality, so different operating voltages must be provided at the LED serial of different primary colors, just can make the cross-pressure of deciding current controller reduce to minimum, power consumption is minimum.
Decide current controller 321C～32nC, 331C～33nC and 341C～34nC and couple so far a little LED serial 321～32n, 331～33n and 341～34n respectively, in order to the size of current of control by corresponding LED serial to reach predetermined brightness.Deciding current controller 321C～32nC, 331C～33nC and 341C～34nC can utilize the numerical digit controller or utilize simple linear constant-current circuit or high frequency switches constant-current circuit and finishes.
In the module 30 backlight decide current controller 321C～32nC, 331C～33nC and 341C～34nC can also be disposed at different positions, please refer to Fig. 4, it illustrates is calcspar according to the module backlight of one second embodiment of the present invention.Decide current controller 321C～32nC, 331C～33nC and 341C～34nC and couple ruddiness dc voltage changer 32, green glow dc voltage changer 33 and blue light dc voltage changer 34 respectively, LED serial 321～32n, 331～33n and 341～34n couple corresponding decide current controller 321C～32nC, 331C～33nC and 341C～34n C.Decide current controller 321C～32n C, 331C～33nC and 341C～34nC and can also be disposed at the another location, please refer to Fig. 5, it illustrates is calcspar according to the module backlight of one the 3rd embodiment of the present invention.Deciding current controller 321C～32nC, 331C～33nC and 341C～34nC can be disposed among the LED serial.
Power supply changeover device 31 in the module 30 backlight, ruddiness dc voltage changer 32, green glow dc voltage changer 33 and blue light dc voltage changer 34 can also be integrated to simplify circuit, please refer to Fig. 7, it illustrates is calcspar according to the module backlight of one the 5th embodiment of the present invention.In the module 70 backlight, ruddiness power supply changeover device 72 can comprise certain function of current or comprise a power factor corrector (PFC), it converts alternating voltage to the ruddiness operating voltage and exports red light-emitting diode tandem 721～72n to, the forward cross-pressure when this ruddiness operating voltage approximates the conducting of red light-emitting diode tandem.Green glow power supply changeover device 73 can comprise certain function of current or comprise a power factor corrector (PFC), it converts alternating voltage to the green glow operating voltage and exports green light LED tandem 731～73n to, the forward cross-pressure when this green glow operating voltage approximates the conducting of green light LED tandem.Blue light power supply changeover device 74 can comprise certain function of current or comprise a power factor corrector (PFC), it converts alternating voltage to the blue light operating voltage and exports blue light-emitting diode tandem 741～74n to, the forward cross-pressure when this blue light operating voltage approximates the conducting of blue light-emitting diode tandem.Decide current controller 721C～72nC, 731C～73nC, 741C～74nC and be couple to this a little LED serials respectively, in order to the size of current of control by corresponding LED serial to reach predetermined brightness.
Disclosed module backlight of the above embodiment of the present invention and drive unit thereof, it uses simplifies the dc voltage changer structure, make the LED serial of the corresponding different primary colors of dc voltage changer that different voltage is provided, thus, the cross-pressure of deciding current controller can reduce to minimum, so can reduce power loss, and raise the efficiency.In addition, compared to the prior art of Fig. 1, can discover significantly, embodiments of the invention use fewer purpose dc voltage changer, so required production cost lacks than the module backlight of Fig. 1.And compared to the prior art of Fig. 2, though embodiments of the invention correspond to three primary colors and use three dc voltage changers, but LED serial 231～23n that the dc voltage changer 22 of Fig. 2 will drive, 241～24n and 251～25n are numerous, dc voltage changer 22 can consume higher power, so dc voltage changer 22 must can bear high power, and make that dc voltage changer 22 employed element areas are bigger, the entire area of dc voltage changer 22 is also bigger than three dc voltage changer area sums of the present invention, and manufacturing cost is high than three dc voltage changers of embodiments of the invention also.Under comparing, it is lower that preferred embodiment of the present invention has a production cost, the advantage that consumed power is also lower.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is with being as the criterion that claims scope is defined.
Claims (19)
1. a LED light source module is characterized in that, comprising:
One first primary colors dc voltage changer is in order to become one first primary colors operating voltage with a direct current voltage transitions;
One second primary colors dc voltage changer is in order to convert this direct voltage to one second primary colors operating voltage;
Most first a primary colors LED serial are in order to receive this first primary colors operating voltage to reach predetermined brightness;
Most second a primary colors LED serial are in order to receive this second primary colors operating voltage to reach predetermined brightness; And
Decides current controller for most, be couple to each LED serial respectively, in order to control size of current by corresponding LED serial respectively to reach predetermined brightness.
2. LED light source module as claimed in claim 1 is characterized in that, this LED light source module is a module backlight.
3. LED light source module as claimed in claim 1 is characterized in that, also comprises a power supply changeover device, in order to an alternating voltage is converted to this direct voltage.
4. LED light source module as claimed in claim 3 is characterized in that this power supply changeover device comprises a power factor corrector.
5. LED light source module as claimed in claim 1 is characterized in that, each dc voltage changer comprises decides function of current.
6. LED light source module as claimed in claim 1 is characterized in that, each is decided current controller and is coupled between this corresponding dc voltage changer and corresponding this LED serial.
7. LED light source module as claimed in claim 1 is characterized in that, each is decided current controller and is configured in the corresponding LED serial.
8. LED light source module as claimed in claim 1 is characterized in that, each is decided current controller and is coupled to a brightness regulator, in order to control the size of current of deciding current controller, to regulate the brightness of corresponding primary colors LED serial.
9. LED light source module as claimed in claim 1 is characterized in that, this first primary colors dc voltage changer is also in order to convert an alternating voltage to this first primary colors operating voltage.
10. LED light source module as claimed in claim 1 is characterized in that, this second primary colors dc voltage changer is also in order to convert an alternating voltage to this second primary colors operating voltage.
11. a LCD is characterized in that, comprising:
One panel; And
One module backlight comprises:
One first primary colors dc voltage changer is in order to become one first primary colors operating voltage with a direct current voltage transitions;
One second primary colors dc voltage changer is in order to convert this direct voltage to one second primary colors operating voltage;
Most first a primary colors LED serial are in order to receive this first primary colors operating voltage to reach predetermined brightness;
Most second a primary colors LED serial are in order to receive this second primary colors operating voltage to reach predetermined brightness; And
Decides current controller for most, be couple to each LED serial respectively, in order to control size of current by corresponding LED serial respectively to reach predetermined brightness.
12. LCD as claimed in claim 11 is characterized in that, this module backlight also comprises a power supply changeover device, in order to an alternating voltage is converted to this direct voltage.
13. LCD as claimed in claim 11 is characterized in that, this power supply changeover device comprises a power factor corrector.
14. LCD as claimed in claim 11 is characterized in that, each dc voltage changer comprises decides function of current.
15. LCD as claimed in claim 11 is characterized in that, each is decided current controller and is coupled between this corresponding dc voltage changer and corresponding this LED serial.
16. LCD as claimed in claim 11 is characterized in that, each is decided current controller and is configured in the corresponding LED serial.
17. LCD as claimed in claim 11 is characterized in that, each is decided current controller and is coupled to a brightness regulator, in order to control the size of current that those decide current controller, to regulate the brightness of corresponding primary colors LED serial.
18. LCD as claimed in claim 11 is characterized in that, this first primary colors dc voltage changer is also in order to convert an alternating voltage to this first primary colors operating voltage.
19. LCD as claimed in claim 11 is characterized in that, this second primary colors dc voltage changer is also in order to convert an alternating voltage to this second primary colors operating voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101628899A CN101193477A (en) | 2006-11-28 | 2006-11-28 | LED light source module and its LCD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101628899A CN101193477A (en) | 2006-11-28 | 2006-11-28 | LED light source module and its LCD |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101193477A true CN101193477A (en) | 2008-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006101628899A Pending CN101193477A (en) | 2006-11-28 | 2006-11-28 | LED light source module and its LCD |
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| CN (1) | CN101193477A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102414736A (en) * | 2009-04-22 | 2012-04-11 | 艾比维利股份有限公司 | Dimming control method for display |
| CN103987149A (en) * | 2013-02-08 | 2014-08-13 | 东林科技股份有限公司 | Dimmable light-emitting-diode illumination system |
-
2006
- 2006-11-28 CN CNA2006101628899A patent/CN101193477A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102414736A (en) * | 2009-04-22 | 2012-04-11 | 艾比维利股份有限公司 | Dimming control method for display |
| CN103987149A (en) * | 2013-02-08 | 2014-08-13 | 东林科技股份有限公司 | Dimmable light-emitting-diode illumination system |
| WO2014121661A1 (en) * | 2013-02-08 | 2014-08-14 | 东林科技股份有限公司 | Dimmable light-emitting diode illumination system |
| CN103987149B (en) * | 2013-02-08 | 2016-04-20 | 东林科技股份有限公司 | The LED illumination system of tunable optical |
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Application publication date: 20080604 |