CN101227782B - Backlight module - Google Patents
Backlight module Download PDFInfo
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- CN101227782B CN101227782B CN2008100056425A CN200810005642A CN101227782B CN 101227782 B CN101227782 B CN 101227782B CN 2008100056425 A CN2008100056425 A CN 2008100056425A CN 200810005642 A CN200810005642 A CN 200810005642A CN 101227782 B CN101227782 B CN 101227782B
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- outer electrode
- backlight module
- fluorescent tube
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Abstract
The invention discloses a backlighting module, the backlighting module contains a first lamp tube, wherein the first lamp tube is provided with a first end and a second end which are used to provide a first voltage signal with a first voltage source, the first voltage source is electrically connected with the first end of the first lamp tube, the backlighting module contains a second lamp tube, wherein the second lamp tube is provided with the first end and the second end which are used to provide a second voltage signal with a second voltage source, the second voltage source is electrically connected with the first end of the second lamp tube, the backlighting module contains a first external electrode, wherein the first external electrode is provided with the first end and the second end the first end of the first external electrode is electrically connected with the second voltage source, the backlighting module contains a second external electrode, wherein the second lamp tube is provided with the first end and the second end, and the first end of the second external electrode is electrically connected with the first voltage source, wherein the first voltage signal and the second voltage signal are in reversed phase. The invention can effectively overcome the defects that an existing technique leaks current and the brightness is lowered.
Description
Technical field
The present invention relates to a kind of backlight module; Be particularly related to a kind of backlight module that uses the external electrode fluorescent lamp pipe.
Background technology
Because developing, the quick progress of LCD manufacturing technology, LCD many advantages, for example light, thin, power saving and radiationless.Because above-mentioned characteristic, LCD is widely used in electronic product miscellaneous, for example: personal digital assistant (Personal Digital Assistants, PDAs), notebook computer, digital camera, digital code camera, mobile phone, computer screen and LCD TV or the like.Yet, because display panels can not self-luminous, so need backlight module to provide light to LCD.Traditional backlight module all have usually several be used to provide light give the cold cathode fluorescent lamp of liquid crystal panel (Cold Cathode Fluorescent Lamps, CCFLs).
Use also can produce heat in the cold cathode fluorescent lamp of backlight module in luminous, thereby causes temperature to rise.Particularly when the needed brightness of LCD is risen gradually, the heat of being distributed also will rise inevitably thereupon, thereby cause the LCD temperature inside to raise.Except the increase of heat, the driving voltage of cold cathode fluorescent lamp also can uprise.Thus, the operating ambient temperature of cold cathode fluorescent lamp can rise significantly, thereby the photoelectric characteristic of deterioration cold cathode fluorescent lamp, further has influence on the quality of backlight module.
(External Electrode Fluorescent Lamps EEFLs) is suggested and addresses the above problem the external electrode fluorescent lamp pipe.Fig. 1 is the generalized section of prior art external electrode fluorescent lamp.The prior art external fluorescent lamps needs two drive circuits, and for example in the example of Fig. 1, a drive circuit comprises a pair of internal electrode 11 and 12 that extends to glass tube 15, and another drive circuit comprises an outer electrode 13 around glass tube 15.Wherein on the inner surface of glass tube 15, be coated with fluorescent material, and its inner space is filled with the gas 16 that is mixed by inert gas and mercury gas.When voltage was applied to internal electrode, electronics is ejected from electrode to be clashed into mercury atom then and causes mercury atom to become excited state.Next, the mercury atom that is excited just can send visible light produce ultraviolet light when excited state is got back to ground state when ultraviolet light strikes the fluorescent material that is plated in the glass tube inner surface.Its operating voltage Tai Gao though being suggested, external electrode fluorescent lamp pipe as shown in Figure 1 solves the described variety of problems of leading portion, to such an extent as to can cause leakage current.In addition, because outer electrode 13 is looped around the outside of fluorescent tube 15, also can cause lowering of luminance.
In sum, be worth and quality in order to improve the backlight module overall applicability, the problem that how can effectively improve above-mentioned leakage current and brightness decline is the target that this industry need be striven for.
Summary of the invention
The object of the present invention is to provide backlight module, it is at the new design of external electrode fluorescent lamp pipe, to reduce its starting voltage and leakage current thereof.
According to aforementioned purpose, backlight module comprises first fluorescent tube, first voltage source, second fluorescent tube, second voltage source, first outer electrode and second outer electrode.This first, second fluorescent tube all has first end and second end, and this first voltage source is in order to exporting first voltage signal, and is electrically connected to this first end of this first fluorescent tube.This second voltage source is in order to exporting second voltage signal, and is electrically connected to this first end of this second fluorescent tube.This first, second outer electrode all has first end and second end, first end of this first outer electrode is electrically connected to this second voltage source, first end of this second electrode is electrically connected to this first voltage source, and wherein this first voltage signal and this second voltage signal are anti-phase.
Aforesaid backlight module also comprises first high impedance circuit, second end of this first outer electrode that this high impedance circuit electrically connects.
Aforesaid backlight module, wherein this high impedance circuit comprises passive component, and this passive component is selected from group and the combination of being made up of resistance, electric capacity, inductance thereof.
Aforesaid backlight module, wherein this second end of this first outer electrode is a suspension joint.
Aforesaid backlight module, wherein this second end of this first fluorescent tube links to each other with this first end of this second fluorescent tube and forms U type fluorescent tube.
Aforesaid backlight module also comprises tertiary voltage source and the 4th voltage source, and wherein second end of this first fluorescent tube second end that is electrically connected to this tertiary voltage source and this second fluorescent tube is electrically connected to the 4th voltage source.
Aforesaid backlight module, wherein this tertiary voltage source is in order to export the tertiary voltage signal to this first fluorescent tube, and the 4th voltage source is in order to export the 4th voltage signal to this second fluorescent tube.
Aforesaid backlight module, wherein this first outer electrode and this second outer electrode are rectangular structure.
Aforesaid backlight module, wherein the diameter of this first fluorescent tube is greater than the width of this first outer electrode, and the diameter of this second fluorescent tube is greater than the width of this second outer electrode.
Aforesaid backlight module also comprises: the tube clamping seat, in order to fix this first fluorescent tube; Pedestal; And the electrode grip slipper, be arranged between tube clamping seat and the pedestal, can be in order to hold this first outer electrode.
Aforesaid backlight module, wherein this electrode grip slipper has circulus, in order to hold this first outer electrode.
Aforesaid backlight module, wherein this first outer electrode has and is arranged at this rectangular structural hole.
Aforesaid backlight module also comprises: the tube clamping seat, and it is in order to fix this first fluorescent tube; And pedestal, this pedestal has protuberance, and wherein this pedestal makes up by hole and this tube clamping seat that this protuberance passes on this first outer electrode.
Aforesaid backlight module also comprises the tube clamping seat, and this fluorescent tube board holder is in order to fix this first fluorescent tube, and wherein this first outer electrode is arranged on the inner surface of this fluorescent tube board holder.
Aforesaid backlight module, wherein this first outer electrode comprises the metal level of this inner surface that is plated in this tube clamping seat.
In sum, the present invention can overcome the defective of above-mentioned leakage current and brightness decline effectively.
Behind the execution mode of consulting accompanying drawing and describing subsequently, any those skilled in the art just can understand other purposes of the present invention, advantage, and technological means of the present invention and enforcement aspect.
Description of drawings
Fig. 1 is the generalized section of prior art external electrode fluorescent lamp;
Fig. 2 is the schematic diagram of an embodiment of backlight module of the present invention;
Fig. 3 is the schematic diagram of an embodiment of backlight module of the present invention;
Fig. 4 is the schematic diagram of an embodiment of backlight module of the present invention;
Fig. 5 is the schematic diagram of an embodiment of backlight module of the present invention;
Fig. 6 (a) and Fig. 6 (b) are the generalized section of an embodiment of backlight module of the present invention;
Fig. 6 (c) is the arrangements of components mode schematic diagram of an embodiment of backlight module of the present invention;
Fig. 7 is the arrangements of components mode schematic diagram of an embodiment of backlight module of the present invention;
Fig. 8 is the schematic diagram of the different shape of outer electrode of the present invention;
Fig. 9 is the generalized section of an embodiment of backlight module of the present invention.
And each description of reference numerals in the above-mentioned accompanying drawing is as follows:
11 internal electrodes
12 internal electrodes
13 outer electrodes
15 glass tubes
16 mists
21 first fluorescent tubes
22 second fluorescent tubes
First end of 211 first fluorescent tubes
Second end of 212 first fluorescent tubes
First end of 221 second fluorescent tubes
Second end of 222 second fluorescent tubes
23 first voltage sources
24 second voltage sources
25 first outer electrodes
26 second outer electrodes
First end of 251 first outer electrodes
Second end of 252 first outer electrodes
First end of 261 second outer electrodes
Second end of 262 second outer electrodes
41,42 high impedance circuits
51 tertiary voltage sources
52 the 4th voltage sources
61 tube clamping seats
62 electrode grip slippers
63 pedestals
64 protuberances
Embodiment
Fig. 2 is the schematic diagram of a preferred embodiment of backlight module of the present invention.Backlight module 20 comprises first fluorescent tube 21, second fluorescent tube 22, first voltage source 23, second voltage source 24, first outer electrode 25 and second outer electrode 26.First fluorescent tube 21 has first end 211 and second end 212.First voltage source 23 is electrically connected to first end 211 of first fluorescent tube 21, is used for exporting first voltage signal.Second fluorescent tube 22 has first end 221 and second end 222.Second voltage source 24 is electrically connected to first end 221 of second fluorescent tube 22, is used for exporting second voltage signal.First outer electrode 25 has first end 251 and second end 252, and wherein first end 251 of first outer electrode 25 is electrically connected to second voltage source 24.Second outer electrode 26 has first end 261 and second end 262, and wherein first end 261 of second outer electrode 26 is electrically connected to first voltage source 23.
In addition, second end 212 and 222 of first fluorescent tube 21 and second fluorescent tube 22 is connected to earth potential, and second end 252 and 262 of first outer electrode 25 and second outer electrode 26 is suspension joint (floating), does not just receive any specific potential.What must mention is that first voltage signal and second voltage signal preferably can be oppositely.Because first voltage signal and second voltage signal are reverse each other, the voltage difference between first fluorescent tube 21 and first outer electrode 25 also will become bigger.That is to say that the voltage difference between first fluorescent tube 21 and first outer electrode 25 is the totalling of the absolute value of the absolute value of the first voltage signal amplitude and the second voltage signal amplitude.According to the configuration of aforementioned this embodiment of the present invention, it is low being applied to the starting voltage signal that the voltage signal of fluorescent tube can be more traditional, thereby reduces the power consumption of backlight module.
Please continue with reference to figure 3.Fig. 3 is the schematic diagram of another preferred embodiment of backlight module of the present invention.Embodiment as the backlight module of Fig. 3 also comprises first fluorescent tube 21, second fluorescent tube 22, first voltage source 23, second voltage source 24, first outer electrode 25 and second outer electrode 26.Similar at the described embodiment of Fig. 3 with embodiment described in Fig. 2.But what must mention is second end 222 that second end 212 of first fluorescent tube 21 in this embodiment is connected to second fluorescent tube.Particularly, first fluorescent tube 21 and second fluorescent tube, the 22 common U type fluorescent tubes that form.Compare with traditional fluorescent tube, because the part that many first fluorescent tubes 21 are connected with second fluorescent tube 22, therefore U type fluorescent tube thereby have more light-emitting zone also provides higher brightness.Similarly, in order to reduce the power consumption of starting voltage and backlight module integral body, the phase place of first voltage signal and second voltage signal preferably is anti-phase.
With reference to figure 4, it is the schematic diagram of another preferred embodiment of backlight module of the present invention.Similar at the described backlight module of Fig. 4 with previous embodiment.The embodiment of Fig. 4 and the difference of previous embodiment are that the backlight module in the present embodiment also comprises two high impedance circuits 41 and 42.These two high impedance circuits 41 and 42 are electrically connected to second end 252 of first outer electrode 25 and second end 262 of second outer electrode 26 respectively.Described two high impedance circuits can be made up of passive component, and passive component can comprise: resistance, electric capacity, inductance or the combination between them.Because high impedance circuit 41 and 42 have high impedance, can make second end 252 and 262 of the win outer electrode 25 and second outer electrode 26 have the character of approximate suspension joint.Configuration according to this embodiment of the invention, the voltage signal that is applied to fluorescent tube are that comparable traditional starting voltage signal is low, thereby the power consumption of backlight module is reduced.
With reference to figure 5, it is the schematic diagram of another preferred embodiment of backlight module of the present invention.Similar at the backlight module described in this preferred embodiment with previous embodiment.More particularly, the backlight module of present embodiment also comprises tertiary voltage source 51 and the 4th voltage source 52, and wherein tertiary voltage source 51 is electrically connected to second end 212 of first fluorescent tube 21, and this tertiary voltage source 51 is in order to output tertiary voltage signal; The 4th voltage source 52 is electrically connected to second end, 222, the four voltage sources 52 of second fluorescent tube 22 in order to export the 4th voltage signal.Preferably have phase difference between first voltage signal and second voltage signal, for example can be 180 degree, but be not restricted to this.Tertiary voltage signal and the 4th voltage signal also preferably have phase difference, for example can be 180 degree, but are not restricted to this.At first voltage signal and second voltage signal is anti-phase and tertiary voltage signal and the 4th voltage signal are that first voltage signal and the 4th voltage signal preferably can be homophase, just do not have phase difference under the anti-phase situation.Can become bigger by first end 211 that adds tertiary voltage source 51, the first fluorescent tubes 21 and the voltage difference between second end 212.That is to say that first end 211 of first fluorescent tube and the voltage difference between second end 212 are the totallings of the absolute value of the absolute value of the first voltage signal amplitude and the second voltage signal amplitude.Configuration according to this embodiment of the invention, the voltage signal that is applied to fluorescent tube are that comparable traditional starting voltage signal is low, thereby the power consumption of backlight module is reduced.
Please refer to Fig. 6 (a) and Fig. 6 (b), it is the schematic diagram of another preferred embodiment of backlight module of the present invention.In this embodiment, backlight module also comprises a tube clamping seat 61, an electrode grip slipper 62 and a pedestal 63.More particularly, tube clamping seat 61 is to be used for fixing first fluorescent tube (not illustrating among the figure) or second fluorescent tube (not illustrating among the figure), and electrode board holder 62 is arranged between tube clamping seat 61 and the pedestal 63.With reference to figure 6 (c), it is the arrangements of components figure of the backlight module in another preferred embodiment of the present invention.In this embodiment, tube clamping seat 61 has protuberance 64, and the compound mode of tube clamping seat 61 and pedestal 63 is by protuberance 64 being passed a hole and 61 combinations of tube clamping seat on the outer electrode 25.
In addition, in the aforementioned embodiment, first outer electrode 25 and second outer electrode (not illustrating among the figure) all has rectangular structure and electrode grip slipper 62 has circulus makes electrode grip slipper 62 to hold first outer electrode 25 or second outer electrode (not illustrating among the figure) by this circulus.In order further to set forth this embodiment, please refer to Fig. 7.In this preferred embodiment, the diameter of first fluorescent tube 21 is greater than the diameter of the width of first outer electrode 25 and second fluorescent tube (not illustrating among the figure) width greater than second outer electrode, and outer electrode just can be blocked by fluorescent tube fully when seeing from top to bottom thus.
What it is also noted that is that in the aforementioned embodiment, the fluorescent tube of being fixed by the tube clamping seat is arranged on the outer electrode top, just can not covered by outer electrode from the light that fluorescent tube emitted thus, thereby can effectively increase the brightness of fluorescent tube.In a preferred embodiment, can be coated with some reflective film in the outer surface of outer electrode, with the brightness of further increase fluorescent tube.By this, just can improve the problem that the lighting tube brightness of the prior art of Fig. 1 reduces.
The profile of outer electrode may have many shapes, and wherein Fig. 8 has illustrated some examples, and can select optimal design according to actual conditions when using.With reference to figure 9, it is the generalized section of another preferred embodiment of backlight module of the present invention.Tube clamping seat 61 is used for fixing the inner surface that first fluorescent tube, 21, the first outer electrodes 25 then are arranged on tube clamping seat 61.More particularly, first outer electrode 25 can be the metal level that one deck is coated on the tube clamping base inner surface.In addition, in order to have heat dissipation characteristics preferably, preferably can the interval specific range between outer electrode and the fluorescent tube.
The above embodiments only are used for exemplifying enforcement aspect of the present invention, and explain technical characterictic of the present invention, are not to be used for limiting category of the present invention.Any those skilled in the art can unlabored change or the impartial arrangement scope that all belongs to the present invention and advocated, and interest field of the present invention should be as the criterion with claim.
Claims (15)
1. backlight module comprises:
First fluorescent tube, this first fluorescent tube has first end and second end;
First voltage source, this first voltage source are in order to providing first voltage signal, and this first voltage source is electrically connected to this first end of this first fluorescent tube;
Second fluorescent tube, this second fluorescent tube has first end and second end;
Second voltage source, this second voltage source are in order to providing second voltage signal, and this second voltage source is electrically connected to this first end of this second fluorescent tube;
First outer electrode, this first outer electrode has first end and second end, and first end of this first outer electrode is electrically connected to this second voltage source; And
Second outer electrode, this second outer electrode has first end and second end, and first end of this second outer electrode is electrically connected to this first voltage source, and wherein this first voltage signal and this second voltage signal are anti-phase.
2. backlight module as claimed in claim 1 also comprises first high impedance circuit, second end of this first outer electrode that this high impedance circuit electrically connects.
3. backlight module as claimed in claim 2, wherein this high impedance circuit comprises passive component, and this passive component is selected from group and the combination of being made up of resistance, electric capacity, inductance thereof.
4. backlight module as claimed in claim 1, wherein this second end of this first outer electrode is a suspension joint.
5. backlight module as claimed in claim 1, wherein this second end of this first fluorescent tube links to each other with this first end of this second fluorescent tube and forms U type fluorescent tube.
6. backlight module as claimed in claim 1 also comprises tertiary voltage source and the 4th voltage source, and wherein second end of this first fluorescent tube second end that is electrically connected to this tertiary voltage source and this second fluorescent tube is electrically connected to the 4th voltage source.
7. backlight module as claimed in claim 6, wherein this tertiary voltage source is in order to export the tertiary voltage signal to this first fluorescent tube, and the 4th voltage source is in order to export the 4th voltage signal to this second fluorescent tube.
8. backlight module as claimed in claim 1, wherein this first outer electrode and this second outer electrode are rectangular structure.
9. backlight module as claimed in claim 8, wherein the diameter of this first fluorescent tube is greater than the width of this first outer electrode, and the diameter of this second fluorescent tube is greater than the width of this second outer electrode.
10. backlight module as claimed in claim 9 also comprises:
The tube clamping seat is in order to fix this first fluorescent tube;
Pedestal; And
The electrode grip slipper is arranged between tube clamping seat and the pedestal, can be in order to hold this first outer electrode.
11. backlight module as claimed in claim 10, wherein this electrode grip slipper has circulus, in order to hold this first outer electrode.
12. backlight module as claimed in claim 9, wherein this first outer electrode has and is arranged at this rectangular structural hole.
13. backlight module as claimed in claim 12 also comprises:
The tube clamping seat, it is in order to fix this first fluorescent tube; And
Pedestal, this pedestal has protuberance, and wherein this pedestal makes up by hole and this tube clamping seat that this protuberance passes on this first outer electrode.
14. backlight module as claimed in claim 1 also comprises the tube clamping seat, this tube clamping seat is in order to fix this first fluorescent tube, and wherein this first outer electrode is arranged on the inner surface of this tube clamping seat.
15. backlight module as claimed in claim 14, wherein this first outer electrode comprises the metal level of this inner surface that is plated in this tube clamping seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100056425A CN101227782B (en) | 2008-02-14 | 2008-02-14 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100056425A CN101227782B (en) | 2008-02-14 | 2008-02-14 | Backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101227782A CN101227782A (en) | 2008-07-23 |
| CN101227782B true CN101227782B (en) | 2011-09-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100056425A Active CN101227782B (en) | 2008-02-14 | 2008-02-14 | Backlight module |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1573464A (en) * | 2003-06-10 | 2005-02-02 | 三星电子株式会社 | Backlight unit and liquid crystal display device having the same |
| CN1809238A (en) * | 2005-01-18 | 2006-07-26 | 哈利盛东芝照明株式会社 | Luminaire |
-
2008
- 2008-02-14 CN CN2008100056425A patent/CN101227782B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1573464A (en) * | 2003-06-10 | 2005-02-02 | 三星电子株式会社 | Backlight unit and liquid crystal display device having the same |
| CN1809238A (en) * | 2005-01-18 | 2006-07-26 | 哈利盛东芝照明株式会社 | Luminaire |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2007-329098A 2007.12.20 |
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| Publication number | Publication date |
|---|---|
| CN101227782A (en) | 2008-07-23 |
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