CN101730364B - Back light module control system - Google Patents
Back light module control system Download PDFInfo
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- CN101730364B CN101730364B CN2008101670683A CN200810167068A CN101730364B CN 101730364 B CN101730364 B CN 101730364B CN 2008101670683 A CN2008101670683 A CN 2008101670683A CN 200810167068 A CN200810167068 A CN 200810167068A CN 101730364 B CN101730364 B CN 101730364B
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Abstract
The invention provides a back light module control system which comprises a power source, a first back light sub-module, a second back light sub-module, a first transformer and a second transformer, wherein the power source provides an operational power source to the back light module control system. The primary side and the secondary side of the first transformer are respectively coupled to the power source and the first end of the first back light sub-module. The primary side of the second transformer is coupled to the power source, and the secondary side of the second transformer is coupled to the secondary side of the first transformer and the first end of the second back light sub-module.
Description
Technical field
The relevant back light module control system of the present invention refers to a kind of back light module control system with a plurality of backlights especially.
Background technology
Please refer to Fig. 1, Fig. 1 is the sketch map of known backlit module control system.As shown in Figure 1; Back light module control system 100 includes an inverted rectifier (inverter) 110 and a plurality of backlight 120_1-120_8, and wherein inverted rectifier 110 has four voltage output end points and two backlights of each voltage output end point system connection.In addition, for the image that makes display pannel shows to have the good homogeneous degree, the brightness of each backlight needs consistent as much as possible, that is the electric current of each backlight of flowing through needs identical as much as possible.
Yet, because the backlight that general tradition is used be a cold-cathode tube (Cold CathodeFluorescent Lamp, CCFL); And cold-cathode tube has negative resistance property, and therefore when the electric current of backlight 120_1 increased, its temperature also increased; After increasing, temperature can cause its resistance to descend, yet, because the voltage that inverted rectifier 110 is exported is definite value; Therefore backlight 120_1 can increase electric current again, in addition, because general back light module control system all has the restriction of output peak power; That is the total current of all fluorescent tubes of flowing through has restriction, if therefore the electric current of backlight 120_1 continues to increase, the electric current of the backlight 120_2 that flows through can reduce; And cause the brightness disproportionation of each backlight, and then have influence on the uniformity of display pannel brightness.
For the uneven problem of the back light source brightness that negative resistance property caused that solves cold-cathode tube; Known method utilizes additional circuit to make each backlight have identical electric current; Fig. 2 utilizes transformer to come the sketch map of the back light module control system 200 of balance backlight current; As shown in Figure 2; Back light module control system 200 includes a voltage source 202, a plurality of backlight 210 and a plurality of transformer 220, and the primary side of wherein a plurality of transformers 220 is connected to corresponding a plurality of backlight 220 respectively, and the secondary side of a plurality of transformer 220 is connected in series each other.Because the secondary side of a plurality of transformers 220 is connected in series each other, so the electric current I s of conducting on it can be identical, and then make a plurality of backlights 220 also have identical electric current I p.In addition; In order to reach the purpose of balance backlight current, also capable of usingly as shown in Figure 3 utilize the known backlit module control system 300 that electric capacity comes the balance backlight current (it includes one drive circuit 302, a transformer 320, a plurality of backlight 310 and a plurality of capacitor C
1-C
8), and the inductance that utilizes shown in the 4th figure comes the known backlit module control system 400 (it includes one drive circuit 402, a transformer 420, a plurality of backlight 410, a plurality of inductance L 1-L4 and a plurality of capacitor C 1-C4) of balance backlight current.
Yet the back light module control system of above-mentioned balance backlight current all needs additional circuit, therefore can cause the complexity of converter circuit and manufacturing cost significantly to rise.
Summary of the invention
Therefore, one of the object of the invention is to propose a kind ofly not need additional circuit or only need the back light module control system that less additional circuit part just can the balance backlight current, to solve the above problems.
According to one embodiment of the invention, it discloses a kind of back light module control system, and it includes: a power supply, first backlight module, second backlight module, one first transformer and one second transformer.This power supply provides this back light module control system one operating power.The primary side of this first transformer and secondary side are respectively coupled to first end of this power supply and this first backlight module.The secondary side that the primary side of this second transformer is coupled to this power supply and this second transformer is coupled to the secondary side of this first transformer and first end of this second backlight module.
Description of drawings
Fig. 1 is the sketch map of known backlit module control system;
Fig. 2 utilizes the voltage device to come the sketch map of the known backlit module control system of balance backlight current;
Fig. 3 is the known sketch map that utilizes electric capacity to come the known backlit module control system of balance backlight current;
Fig. 4 is the known sketch map that utilizes inductance to come the known backlit module control system of balance backlight current;
Fig. 5 is the sketch map of first embodiment of back light module control system of the present invention;
Fig. 6 is the sketch map of second embodiment of back light module control system of the present invention;
Fig. 7 is the sketch map of the 3rd embodiment of back light module control system of the present invention;
Fig. 8 is the sketch map of the 4th embodiment of back light module control system of the present invention.
[primary clustering symbol description]
| 100、200、300、400、500、600、700、800 | Back light module |
| 110 | Inverted rectifier |
| 302、402 | Drive circuit |
| 120_1、120_2、120_3、120_4、120_5、120_6、 | Backlight |
| 120_7、120_8、210、310、410、510_1、510_2、610_1、610_2、610_3、610_4、710_1、710_2、?710_3、710_4、810_1、810_2、810_3、810_4、? | |
| 202、502、602、702、802 | Voltage source |
| 220、320、420、520_1、520_2、620_1、620_2、620_3、620_4、620_5、720_1、720_2、720_3、?720_4、820_1、820_2、820_3、820_4 | Transformer |
| 730_1、730_2、830_1、830_2 | Backlight module |
| C 1、C 2、C 3、C 4、C 5、C 6、C 7、C 8 | Electric capacity |
| L1、L2、L3、L4 | Inductance |
Embodiment
Please refer to Fig. 5, Fig. 5 is the sketch map of back light module control system 500 of the present invention.As shown in Figure 5; Back light module control system 500 includes a voltage source 502, two backlight modules (being example with two backlight 510_1,510_2 in the present embodiment) and two transformer 520_1,520_2; Wherein the primary side of transformer 520_1 and secondary side are respectively coupled to first end of voltage source 502 and backlight 510_1; And the primary side of transformer 520_2 is coupled to voltage source 502, and the secondary side of transformer 520_2 is coupled to the secondary side of transformer 520_1 and first end of backlight 510_2; In addition; The end points of positive polarity is coupled to backlight 510_1 in the secondary side of transformer 520_1; The end points of negative polarity is coupled to backlight 510_2 in the secondary side of transformer 520_2, and the end points of negative polarity is coupled to the end points of positive polarity in the secondary side of transformer 520_2 in the secondary side of transformer 520_1.The number that note that backlight among Fig. 5 is not to be used as restrictive condition of the present invention only as the usefulness of example explanation.
In back light module control system 500; As the coil lock number of the primary side of transformer 520_1 and 520_2 and secondary side when identical (that is Na2/Na1=Nb2/Nb1); Because 1 side of transformer 520_1,520_2 has identical input voltage, so the output voltage also identical (that is the voltage quasi position of terminal A is a virtual earth) of the secondary side of transformer 520_1,520_2; Therefore and the secondary side of backlight 510_1,510_2 and transformer 520_1,520_2 forms a loop, and the electric current in this loop all can be identical, that is backlight 510_1,510_2 can have identical electric current I
1Can know that by above-mentioned explanation back light module control system 500 of the present invention can be issued to the backlight current balance what need not add additional circuit assemblies such as transformer, electric capacity, inductance, and then improves the uniformity of display pannel brightness.
Be noted that; The positive-negative polarity end points of the secondary side of transformer 520_1,520_2 also can use following connected mode: the end points of negative polarity is coupled to backlight 510_1 in the secondary side of transformer 520_1; The end points of positive polarity is coupled to backlight 510_2 in the secondary side of transformer 520_2; And the end points of positive polarity system is coupled to the end points of negative polarity in the secondary side of transformer 520_2 in the secondary side of transformer 520_1, and so backlight 510_1,510_2 also can have identical electric current.
In addition, in the back light module control system 500, the second end ground connection of backlight 510_1 and 510_2, however second end of backlight 510_1 and 510_2 also can be connected to each other and need not be connected to other voltage quasi position.
Please refer to Fig. 6, Fig. 6 is the sketch map of back light module control system 600.As shown in Figure 6; Back light module control system 600 includes a voltage source 602, four backlight modules (be in the present embodiment be example with four backlight 610_1-610_4) and five transformer 620_1-620_5; The connected mode of backlight 610_1,610_2 and transformer 620_1,620_2 wherein; And the connected mode of backlight 610_3,610_4 and transformer 620_3,620_4 is identical with the connected mode of backlight 510_1,510_2 and transformer 520_1 shown in Figure 5,520_2; In addition; The side-line of transformer 620_5 is connected to transformer 620_1,620_2, and the secondary side of transformer 620_5 is connected to transformer 620_3,620_4.Note that circuit framework shown in Figure 6 only as the usefulness of example explanation, is not to be used as restrictive condition of the present invention, and for example, in other embodiment, it is four that the number of backlight does not limit.
For back light module control system 600; In design, the primary side of transformer 620_5 is identical with the coil lock number system of secondary side, so electric current I in1, the Iin2 of the primary side of transformer 620_5 and secondary side also can be identical; In addition; Transformer 620_1-620_4 is identical transformer, and the electric current of the primary side of the transformer 620_1-620_4 that therefore flows through also can equate, and the secondary side of transformer 620_1-620_4 also can have identical electric current I
2
In addition; In back light module control system 600,, only need add the electric current that a transformer just can four backlights of balance though add balancing circuitry (transformer 620_5); Therefore compare with known technology; The component count of additional circuit is fewer in the back light module control system 600 of the present invention, and therefore the design on circuit is also fairly simple, the cost on therefore can reducing design and making.
In back light module control system 600, the phase arrangement of backlight 610_1-610_4 be (+,-; +,-) (that is the electric current of adjacent two backlights is opposite), yet; The phase arrangement that need be applied to backlight as the present invention for (+,+,-;-) time, then can use following examples to come the balance backlight current.
Fig. 7 is the sketch map of back light module control system 700 of the present invention.As shown in Figure 7; Back light module control system 700 includes a voltage source 702, two backlight module 730_1,730_2 and two transformer 720_1,720_2; Wherein backlight time module 730_1 includes backlight 710_1,710_2 and a transformer 720_3; And backlight time module 730_2 includes backlight 710_3,710_4 and a transformer 720_4; Wherein the primary side of transformer 720_1 and secondary side are respectively coupled to voltage source 702 and transformer 720_3, and the primary side of transformer 720_2 is coupled to voltage source 702, and wherein secondary side is coupled to transformer 720_1 and 720_4; In addition; First end system of backlight 710_1 and 710_2 is coupled to the primary side of transformer 720_3 and the end points that secondary side has identical polar respectively, and first end of backlight 710_3 and 710_4 is coupled to the primary side of transformer 720_4 and the end points that secondary side has identical polar respectively.
In back light module control system 700; When the coil lock number of the primary side of transformer 720_1 and 720_2 and secondary side when identical; Because transformer 720_2 is connected in transformer 720_1 (that is terminal A is a virtual earth), so the secondary side of transformer 720_1,720_2 has identical electric current I
3, identical because the primary side of transformer 720_3 and 720_4 and the coil lock number of secondary side are designed in addition, so backlight 710_1-710_4 can have same current I
4
In addition, in the back light module control system 700, the second end ground connection of backlight 710_1-710_4, however second end of backlight 710_1-710_4 also can be connected to each other and need not be connected to other voltage quasi position.
Fig. 8 is the sketch map of back light module control system 800 of the present invention.As shown in Figure 8; Back light module control system 800 includes a voltage source 802, two backlight module 830_1,830_2 and two transformer 820_1,820_2, and wherein backlight time module 830_1 includes two backlight 810_1,810_2 and a transformer 820_3, and backlight module 830_2 includes backlight 810_3,810_4 and a transformer 820_4; The phase arrangement that back light module control system 800 is applied to backlight for (+; + ,-,-) time; Its principle and function mode and back light module control system 700 are similar, therefore repeat no more at this.
The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to the covering scope of claims of the present invention.
Claims (8)
1. a back light module control system is characterized in that, includes:
One power supply;
One first backlight module;
One second backlight module;
One first transformer, wherein the primary side of this first transformer and secondary side are respectively coupled to first end of this power supply and this first backlight module; And
One second transformer, wherein the primary side of this second transformer secondary side that is coupled to this power supply and this second transformer is coupled to the secondary side of this first transformer and first end of this second backlight module;
Wherein, In the secondary side of this first transformer in the secondary side of the end points of corresponding one first polarity and this second transformer the end points of corresponding one second polarity be respectively coupled to this first backlight module and this second backlight module; And in the secondary side of this first transformer end points that should second polarity is coupled in the secondary side of this second transformer to end points that should first polarity, so that this first backlight module and this second backlight module have identical electric current; This first polarity be a positive polarity and a negative polarity one of them, and this second polarity is wherein another of this positive polarity and this negative polarity; Second end of this first backlight module is coupled to second end of this second backlight module.
2. back light module control system as claimed in claim 1 is characterized in that, this first backlight module includes:
One the 3rd transformer is coupled to this first transformer;
One first backlight has the primary side that first end is coupled to the 3rd transformer; And
One second backlight has first end and is coupled to the secondary side of the 3rd transformer and has second end that second end is coupled to this first backlight;
This second backlight module includes:
One the 4th transformer is coupled to this second transformer;
One the 3rd backlight has the primary side that first end is coupled to the 4th transformer; And
One the 4th backlight has first end and is coupled to the secondary side of the 4th transformer and has second end that second end is coupled to the 3rd backlight.
3. back light module control system as claimed in claim 2; It is characterized in that; This first backlight and this second backlight are coupled to the primary side of the 3rd transformer and the end points that secondary side has identical polar respectively, and the 3rd backlight and the 4th backlight are coupled to the primary side of the 4th transformer and the end points that secondary side has identical polar respectively.
4. back light module control system as claimed in claim 2 is characterized in that, second end of this first backlight and second end of this second backlight are coupled to second end of the 3rd backlight and second end of the 4th backlight.
5. back light module control system as claimed in claim 1 is characterized in that, this first backlight module includes:
One first backlight has the secondary side that first end is coupled to this first transformer;
One second backlight has the secondary side that first end is coupled to this first transformer; And
One the 3rd transformer, wherein the primary side of the 3rd transformer and secondary side are respectively coupled to second end of this first backlight and second end of this second backlight;
This second backlight module includes:
One the 3rd backlight has the secondary side that first end is coupled to this second transformer;
One the 4th backlight has the secondary side that first end is coupled to this second transformer; And
One the 4th transformer, wherein the primary side of the 4th transformer and secondary side are respectively coupled to second end of the 3rd backlight and second end of the 4th backlight.
6. back light module control system as claimed in claim 5; It is characterized in that; This first backlight and this second backlight are coupled to the primary side of the 3rd transformer and the end points that secondary side has identical polar respectively, and the 3rd backlight and the 4th backlight are coupled to the primary side of the 4th transformer and the end points that secondary side has identical polar respectively.
7. back light module control system as claimed in claim 5 is characterized in that the 3rd transformer is coupled to the 4th transformer.
8. back light module control system as claimed in claim 1 is characterized in that, this first backlight module is a backlight, and this second backlight module is a backlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101670683A CN101730364B (en) | 2008-10-10 | 2008-10-10 | Back light module control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101670683A CN101730364B (en) | 2008-10-10 | 2008-10-10 | Back light module control system |
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|---|---|
| CN101730364A CN101730364A (en) | 2010-06-09 |
| CN101730364B true CN101730364B (en) | 2012-07-25 |
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| CN2008101670683A Active CN101730364B (en) | 2008-10-10 | 2008-10-10 | Back light module control system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1971363A (en) * | 2005-11-24 | 2007-05-30 | 晨星半导体股份有限公司 | Backlight module, current inverter and method for generating DC voltage |
| CN101009084A (en) * | 2006-01-27 | 2007-08-01 | 奇美电子股份有限公司 | LCD, backlight module and its lamp tube driving device |
| US7375474B2 (en) * | 2005-04-18 | 2008-05-20 | Lg.Philips Lcd Co., Ltd. | Apparatus and method for driving backlight |
| CN101206342A (en) * | 2006-12-22 | 2008-06-25 | 奇美电子股份有限公司 | Light tube drive circuit, backlight module group and LCD |
-
2008
- 2008-10-10 CN CN2008101670683A patent/CN101730364B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7375474B2 (en) * | 2005-04-18 | 2008-05-20 | Lg.Philips Lcd Co., Ltd. | Apparatus and method for driving backlight |
| CN1971363A (en) * | 2005-11-24 | 2007-05-30 | 晨星半导体股份有限公司 | Backlight module, current inverter and method for generating DC voltage |
| CN101009084A (en) * | 2006-01-27 | 2007-08-01 | 奇美电子股份有限公司 | LCD, backlight module and its lamp tube driving device |
| CN101206342A (en) * | 2006-12-22 | 2008-06-25 | 奇美电子股份有限公司 | Light tube drive circuit, backlight module group and LCD |
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| Publication number | Publication date |
|---|---|
| CN101730364A (en) | 2010-06-09 |
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Effective date of registration: 20230510 Address after: No. two, No. 1188 West Ring Road, Shengze Town, Wujiang District, Jiangsu, Suzhou Patentee after: Suzhou Shengze science and Technology Pioneer Park Development Co.,Ltd. Address before: 215217, No. 88, Tung Hing Road, Tongli District, Wujiang Economic Development Zone, Suzhou, Jiangsu Patentee before: CPTW (WUJIANG) Co.,Ltd. Patentee before: Chunghwa Picture Tubes, Ltd. |
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