CN101399156B - Cold-cathode lamp tube and backlight module using the cold-cathode lamp tube - Google Patents
Cold-cathode lamp tube and backlight module using the cold-cathode lamp tube Download PDFInfo
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- CN101399156B CN101399156B CN2007101531648A CN200710153164A CN101399156B CN 101399156 B CN101399156 B CN 101399156B CN 2007101531648 A CN2007101531648 A CN 2007101531648A CN 200710153164 A CN200710153164 A CN 200710153164A CN 101399156 B CN101399156 B CN 101399156B
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Abstract
The invention discloses a cold cathode lighting tube and a backlight module using the cold cathode lighting tube. The cold cathode lighting tube comprises a glass tube, a fluorescent layer, a first electrode, a second electrode, two line conductors and a first conductive layer. The glass tube is provided with a cavity chamber and an external wall, and the cavity chamber is filled with inert gas and mercury vapor. The fluorescent layer is arranged on the surface of the cavity chamber of the glass tube. The first electrode and the second electrode are arranged in the cavity chamber and at two ends of the glass tube. The two line conductors are arranged outside the glass tube and extend into the cavity chamber of the glass tube while electrically connected with the first electrode and the second electrode respectively. The first conductive layer is arranged at the external wall of the glass tube corresponding with the first electrode, and the first conductive layer is grounded. The cold cathode lighting tube has good illumination efficiency.
Description
Technical field
The present invention relates to a kind of cold cathode fluorescent lamp, and be particularly related to a kind of backlight module that has the cold cathode fluorescent lamp of good illumination efficiency and use this cold cathode fluorescent lamp.
Background technology
(Cold Cathode Fluorescent Lamp CCFL) is a kind of novel lighting source to cold cathode fluorescent lamp.Because cold cathode fluorescent lamp has that fluorescent tube is tiny, simple in structure, surface brightness is high, easily be processed into different shape (straight tube shape, L shaped, U type, annular etc.) and advantage such as long service life, so be regarded as the desirable light source of current LCD.
Cold cathode fluorescent lamp belongs to low-pressure mercury discharge lamp.Cold cathode fluorescent lamp scribbles one deck fluorophor at the glass tube inwall, and at the inner mercury of enclosing a spot of inert gas and trace of glass tube.See through and to apply high voltage and make electronics disengage, and electronics can run foul of each other with mercury atom and gas molecule and produces ultraviolet ray in the electrode at cold cathode fluorescent lamp two ends.The result is, ultraviolet light is excited fluophor, and makes fluorophor emit visible light.
Yet this cold cathode fluorescent lamp is not good with the efficient that indirect mode produces visible light, and as the luminous efficiency of desire lifting cold cathode fluorescent lamp, known technology has following several:
(1) material of the electrode of change cold cathode fluorescent lamp adopts the material that has than low work function, to obtain higher electric current.Yet the electric current of Ti Shenging is still very limited thus.
(2) adopt fluorescent material, to promote the luminous efficiency of fluorescent tube with higher photoluminescence efficiency.Yet the cost of the fluorescent material of high-luminous-efficiency is higher, makes the cost of cold cathode fluorescent lamp be difficult for descending.
(3) directly apply higher voltage on the electrode of cold cathode fluorescent lamp, to increase lamp current.Thus, can promote the brightness of fluorescent tube.Yet such mode need consume higher power, does not meet the demand of energy savings.
Summary of the invention
In view of this, the invention provides a kind of cold cathode fluorescent lamp, have good illumination efficiency and can reduce the cost of manufacture and the saving energy.
The invention provides a kind of backlight module, it adopts above-mentioned cold cathode fluorescent lamp, has good illumination efficiency, and can reduce cost of manufacture and save the energy.
For specifically describing content of the present invention, propose a kind of cold cathode fluorescent lamp at this and comprise: glass tube, fluorescence coating, first electrode, second electrode, two leads and first conductive layer.Glass tube has chamber and outer wall, and is filled with inert gas and mercury vapour in the chamber.Fluorescence coating is disposed on the chamber surfaces of glass tube.First electrode and second electrode are disposed in the chamber and are positioned at the two ends of glass tube.Two conductor configurations are in the outside of glass tube and extend in the chamber of glass tube, and electrically connect with first electrode and second electrode respectively.First conductive layer is that corresponding first electrode is disposed on the outer wall of glass tube, and makes the first conductive layer ground connection.Above-mentioned cold cathode fluorescent lamp also comprises second conductive layer, corresponding second electrode and being disposed on the outer wall of glass tube, and make the second conductive layer ground connection.
The present invention reintroduces a kind of backlight module and comprises: lamp box, a plurality of cold cathode fluorescent lamp and diffuser plate.Cold cathode fluorescent lamp is disposed in the lamp box, and each cold cathode fluorescent lamp comprises glass tube, fluorescence coating, first electrode, second electrode, two leads and first conductive layer.Glass tube has chamber and outer wall, and is filled with inert gas and mercury vapour in the chamber.Fluorescence coating is disposed on the chamber surfaces of glass tube.First electrode and second electrode are disposed in the chamber and are positioned at the two ends of glass tube.Two conductor configurations are in the outside of glass tube and extend in the chamber of glass tube, and respectively with first electrode and the electric connection of second electrode.First conductive layer is that corresponding first electrode is disposed on the outer wall of glass tube, and makes the first conductive layer ground connection.Diffuser plate is the top that is disposed at lamp box.Above-mentioned cold cathode fluorescent lamp also comprises second conductive layer, corresponding second electrode and being disposed on the outer wall of glass tube, and make the second conductive layer ground connection.
The present invention also provides another kind of backlight module to comprise: light guide plate and cold cathode fluorescent lamp.Light guide plate has light entrance face and light-emitting face.Cold cathode fluorescent lamp is disposed at by the light entrance face of light guide plate.The light that cold cathode fluorescent lamp provided is incident in the light guide plate, and by the light-emitting face outgoing, wherein, cold cathode fluorescent lamp comprises glass tube, fluorescence coating, first electrode, second electrode, two leads and first conductive layer.Glass tube has chamber and outer wall, and is filled with inert gas and mercury vapour in the chamber.Fluorescence coating is disposed on the chamber surfaces of glass tube.First electrode and second electrode are disposed in the chamber and are positioned at the two ends of glass tube.Two conductor configurations are in the outside of glass tube and extend in the chamber of glass tube, and respectively with first electrode and the electric connection of second electrode.First conductive layer is that corresponding first electrode is disposed on the outer wall of glass tube, and makes the first conductive layer ground connection.Above-mentioned cold cathode fluorescent lamp also comprises second conductive layer, corresponding second electrode and being disposed on the outer wall of glass tube, and make the second conductive layer ground connection.
In one embodiment of this invention, the first above-mentioned conductive layer extends a length from the top of first electrode toward the direction of second electrode, and length is between 0.1 centimetre～1 centimetre.
In one embodiment of this invention, second conductive layer extends a length from the top of second electrode toward the direction of first electrode, and length is between 0.1 centimetre～1 centimetre.
In one embodiment of this invention, the material of above-mentioned first conductive layer and second conductive layer comprises the oxide of metal or metal.Above-mentioned metal can be nickel, gold, silver or copper.
In one embodiment of this invention, above-mentioned inert gas is to be selected from helium, neon, argon gas, krypton gas, xenon and combination thereof.
The present invention passes through configuration first conductive layer on the glass tube outer wall of corresponding first electrode, and with the first conductive layer ground connection.And, on making first electrode, be applied with high pressure and when becoming high-pressure side, second electrode promptly becomes low-pressure end.Because the first conductive layer ground connection, and first conductive layer and first distance between electrodes are much smaller than the distance between first electrode (high-pressure side) and second electrode (low-pressure end), therefore, between first conductive layer and first electrode, form very strong electric field, and help the emission of electronics.The result is can improve the luminous efficiency of cold cathode fluorescent lamp, and then promote the brightness of cold cathode fluorescent lamp.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Figure 1A illustrates the schematic diagram into a kind of cold cathode fluorescent lamp of the preferred embodiment of the present invention.
Figure 1B illustrates the schematic diagram into the another kind of cold cathode fluorescent lamp of the preferred embodiment of the present invention.
Fig. 2 illustrates the schematic diagram into a kind of backlight module of the preferred embodiment of the present invention.
Fig. 3 illustrates the schematic diagram into the another kind of backlight module of the preferred embodiment of the present invention.
Description of reference numerals
100,200,320,420: cold cathode fluorescent lamp 102: glass tube
102a: outer wall 104: chamber
106: inert gas 108: mercury vapour
110: 112: the first electrodes of fluorescence coating
Electrode 116 in 114: the second: lead
120: the second conductive layers of 118: the first conductive layers
122: electronics 124: ultraviolet light
126: visible light 300,400: backlight module
310: lamp box 330: diffuser plate
410: light guide plate 412: light entrance face
414: light-emitting face d: length
Embodiment
Figure 1A illustrates the schematic diagram into a kind of cold cathode fluorescent lamp of the preferred embodiment of the present invention.Please refer to Figure 1A, this cold cathode fluorescent lamp 100 comprises glass tube 102, fluorescence coating 110, first electrode 112, second electrode 114, two leads 116 and first conductive layer 118.Glass tube 102 has chamber 104 and outer wall 102a, and is filled with inert gas 106 and mercury vapour 108 in the chamber 104.Inert gas 106 can be to be selected from helium, neon, argon gas, krypton gas, xenon and combination thereof, and for example the combination of argon gas and neon is not limited at this.
When applying high voltage in first electrode 112 of cold cathode fluorescent lamp 100 or second electrode 114, be filled in the bump that mercury vapour 108 in the chamber 104 can be subjected to the electronics 122 that electrode emits, emit ultraviolet light 124 and be excited.Please continue with reference to Figure 1A, fluorescence coating 110 is to coat on chamber 104 inner surfaces of glass tube 102.Understand fluorescence excitation layers 110 by the ultraviolet light 124 that mercury vapour 108 is produced, and make fluorescence coating 110 produce visible lights 126.Visible light 126 colors that fluorescence coating 110 is produced can be white, blue, red, the green or visible light of other colors 126, that is, by adjusting the fluorescent material composition in the fluorescence coating 110, can determine the color of the light that fluorescence coating 110 is sent.
In addition, first electrode 112 and second electrode 114 are the two ends that are disposed in the chamber 104 and are positioned at glass tube 102.Two leads 116 are disposed at the outside of glass tube 102 and extend in the chamber 104 of glass tube 102, and electrically connect with first electrode 112 and second electrode 114 respectively.The material of first electrode 112, second electrode 114 and lead 116 can be the metal of low work function, is not limited at this.Here be noted that first electrode 112 and second electrode 114 are to be mutually high-pressure side and low-pressure end at this first electrode 112 is set at high-pressure side, and second electrode 114 to be set at low-pressure end.Certainly, have in the affiliated technical field and know the visual actual needs of the knowledgeable usually, be high-pressure side and suitably set what person, what person is a low-pressure end.
What deserves to be mentioned is, on the glass tube 102 outer wall 102a of corresponding first electrode 112, dispose first conductive layer 118, particularly, make first conductive layer, 118 ground connection.The result is, because the distance between first conductive layer 118 and first electrode 112 (high-pressure side) is very little, thus can form a very strong electric field between first conductive layer 118 and first electrode 112, and help the emission of electronics.That is to say that can produce a large amount of electronics 122 between first conductive layer 118 and first electrode 112, these electronics 122 can clash into mercury vapour 108 and produce ultraviolet light 124.Thus, under the constant situation of the magnitude of voltage that applies voltage, just can increase the luminous efficiency of cold cathode fluorescent lamp 100, and then promote the brightness of cold cathode fluorescent lamp 100.In addition, the position at first conductive layer, 118 places is to extend a length d from the top of first electrode 112 toward the direction of second electrode 114, and length d is between 0.1 centimetre～1 centimetre.Thus, can adjust formed electric field strength between first conductive layer 118 and first electrode 112, and then help the electronics emission.
Figure 1B illustrates the schematic diagram into the another kind of cold cathode fluorescent lamp of the preferred embodiment of the present invention.Please refer to Figure 1B, this cold cathode fluorescent lamp 200 is similar with cold cathode fluorescent lamp 100, and identical member indicates with identical symbol.Both are difference: this cold cathode fluorescent lamp 200 also comprises second conductive layer 120, is disposed on the outer wall 102a of glass tube 102 of corresponding second electrode 114, and makes second conductive layer, 120 ground connection.In addition, second conductive layer 120 extends a length d from the top of second electrode 114 toward the direction of first electrode 112, and length d is between 0.1 centimetre～1 centimetre.
Thus,, or second electrode 114 is set at high-pressure side, can reaches above-mentioned technique effect no matter be that first electrode 112 is set at high-pressure side.More specifically, if when second electrode 114 is made as high-pressure side, distance between second conductive layer 120 and second electrode 114 is less than the distance of first electrode 112 and second electrode 114, therefore can the very big electric field of formation between second conductive layer 120 and second electrode 114, and then make a large amount of electronics 122 of generation between second conductive layer 120 and second electrode 114.Thus, can increase the probability of electronics 122 bump mercury vapour 108, and produce a large amount of ultraviolet light 124.The result is to promote the efficient that cold cathode fluorescent lamp 200 is emitted visible light 126.In addition, first conductive layer 118 and second conductive layer 120 can be the outer wall 102a that partly is arranged at cold cathode fluorescent lamp 100; Or be arranged to outer wall 102a, and further promote the luminous efficiency of cold cathode fluorescent lamp 100 around cold cathode fluorescent lamp 100.In addition, the material of first conductive layer 118 and second conductive layer 120 for example is the oxide of metal or this metal, and above-mentioned metal can be nickel, gold, silver or copper, is not limited at this.
Fig. 2 illustrates the schematic diagram into a kind of backlight module of the preferred embodiment of the present invention.Please refer to Fig. 2, this backlight module 300 comprises lamp box 310, a plurality of cold cathode fluorescent lamp 320 and diffuser plate 330.A plurality of cold cathode fluorescent lamp 320 are to be disposed in the lamp box 310, and diffuser plate 330 is the tops that are disposed at lamp box 310.Particularly, cold cathode fluorescent lamp 320 can adopt above-mentioned cold cathode fluorescent lamp 100,200, and this will make backlight module 300 have preferable luminous efficiency.As the backlight module 300 that Fig. 2 illustrated is direct type backlight module, is applicable in large-sized LCD, so that area source to be provided.
Fig. 3 illustrates the schematic diagram into the another kind of backlight module of the preferred embodiment of the present invention.Please refer to Fig. 3, backlight module 400 comprises light guide plate 410 and cold cathode fluorescent lamp 420.Light guide plate 410 has a light entrance face 410 and a light-emitting face 414.Cold cathode fluorescent lamp 420 is disposed at light entrance face 412 sides of light guide plate 410, and the light that cold cathode fluorescent lamp 420 is provided is incident in the light guide plate 410 by light entrance face 412, and is penetrated by light-emitting face 414.In detail, light guide plate 410 can be plate light guide plate or wedge shape light guide plate, and cold cathode fluorescent lamp 420 can be to adopt above-mentioned cold cathode fluorescent lamp 100,200, and this will make backlight module 400 have preferable luminous efficiency.As the backlight module 400 that Fig. 3 illustrated is the lateral incident type backlight module, is applicable in the LCD of small-medium size, so that area source to be provided.
In sum, cold cathode fluorescent lamp of the present invention and use the backlight module of this cold cathode fluorescent lamp to have the following advantages:
Go up configuration first conductive layer 118 by glass tube 102 outer wall 102a, and, can between first electrode 112 and first conductive layer 118, form very big electric field first conductive layer, 118 ground connection in corresponding first electrode 112 (high-pressure side).This helps first electrode 112 and discharges electronics, advances the luminous efficiency that can improve cold cathode fluorescent lamp 100.And, can form very big electric field because the voltage that is applied is constant, so can promote the service efficiency of the energy.Moreover, because the making of first conductive layer 118 is simple, therefore can reduce cost of manufacture.In addition, the backlight module 300,400 of using above-mentioned cold cathode fluorescent lamp 100,200 also has good illumination efficiency, can reach the effect of power saving.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; the person of ordinary skill in the field without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is when looking being as the criterion that accompanying Claim defines.
Claims (18)
1. cold cathode fluorescent lamp is characterized in that described cold cathode fluorescent lamp comprises:
Glass tube has chamber and outer wall, and is filled with inert gas and mercury vapour in this chamber;
Fluorescence coating is disposed on this chamber surfaces of this glass tube;
First electrode and second electrode are disposed in this chamber and are positioned at the two ends of this glass tube;
Two leads are disposed at the outside of this glass tube and extend in this chamber of this glass tube, and respectively with this first electrode and the electric connection of this second electrode;
First conductive layer to should first electrode and be disposed on this outer wall of this glass tube, and makes this first conductive layer ground connection; And
Second conductive layer to should second electrode and be disposed on this outer wall of this glass tube, and makes this second conductive layer ground connection.
2. cold cathode fluorescent lamp as claimed in claim 1 it is characterized in that wherein this first conductive layer extends a length from the top of this first electrode toward the direction of this second electrode, and this length is between 0.1 centimetre～1 centimetre.
3. cold cathode fluorescent lamp as claimed in claim 1 it is characterized in that wherein this second conductive layer extends a length from the top of this second electrode toward the direction of this first electrode, and this length is between 0.1 centimetre～1 centimetre.
4. cold cathode fluorescent lamp as claimed in claim 1 is characterized in that the material of this first conductive layer and this second conductive layer wherein comprises the oxide of metal or this metal.
5. cold cathode fluorescent lamp as claimed in claim 4 is characterized in that wherein this metal comprises nickel, gold, silver or copper.
6. cold cathode fluorescent lamp as claimed in claim 1, wherein this inert gas is to be selected from helium, neon, argon gas, krypton gas, xenon and combination thereof.
7. backlight module is characterized in that described backlight module comprises:
Lamp box;
A plurality of cold cathode fluorescent lamp are disposed in this lamp box, and each cold cathode fluorescent lamp comprises:
Glass tube has chamber and outer wall, and is filled with inert gas and mercury vapour in this chamber;
Fluorescence coating is disposed on this chamber surfaces of this glass tube
First electrode and second electrode are disposed in this chamber and are positioned at the two ends of this glass tube;
Two leads are disposed at the outside of this glass tube and extend in this chamber of this glass tube, and respectively with this first electrode and the electric connection of this second electrode;
First conductive layer to should first electrode and be disposed on this outer wall of this glass tube, and makes this first conductive layer ground connection;
Second conductive layer to should second electrode and be disposed on this outer wall of this glass tube, and makes this second conductive layer ground connection; And
Diffuser plate is disposed at the top of this lamp box.
8. backlight module as claimed in claim 7 it is characterized in that wherein this first conductive layer extends a length from the top of this first electrode toward the direction of this second electrode, and this length is between 0.1 centimetre～1 centimetre.
9. backlight module as claimed in claim 7 it is characterized in that wherein this second conductive layer extends a length from the top of this second electrode toward the direction of this first electrode, and this length is between 0.1 centimetre～1 centimetre.
10. backlight module as claimed in claim 7 is characterized in that the material of this first conductive layer and this second conductive layer wherein comprises the oxide of metal or this metal.
11. backlight module as claimed in claim 10 is characterized in that wherein this metal comprises nickel, gold, silver or copper.
12. backlight module as claimed in claim 7, wherein this inert gas is to be selected from helium, neon, argon gas, krypton gas, xenon and combination thereof.
13. a backlight module is characterized in that described backlight module comprises:
Light guide plate has a light entrance face and a light-emitting face; And
Cold cathode fluorescent lamp is disposed at by this light entrance face of this light guide plate, and the light that this cold cathode fluorescent lamp provided is incident in this light guide plate, and by this light-emitting face outgoing, this cold cathode fluorescent lamp comprises:
Glass tube has chamber and outer wall, and is filled with inert gas and mercury vapour in this chamber;
Fluorescence coating is disposed on this chamber surfaces of this glass tube
First electrode and second electrode are disposed in this chamber and are positioned at the two ends of this glass tube;
Two leads are disposed at the outside of this glass tube and extend in this chamber of this glass tube, and respectively with this first electrode and the electric connection of this second electrode;
First conductive layer to should first electrode and be disposed on this outer wall of this glass tube, and makes this first conductive layer ground connection; And
Second conductive layer to should second electrode and be disposed on this outer wall of this glass tube, and makes this second conductive layer ground connection.
14. backlight module as claimed in claim 13 it is characterized in that wherein this first conductive layer extends a length from the top of this first electrode toward the direction of this second electrode, and this length is between 0.1 centimetre～1 centimetre.
15. backlight module as claimed in claim 13 it is characterized in that wherein this second conductive layer extends a length from the top of this second electrode toward the direction of this first electrode, and this length is between 0.1 centimetre～1 centimetre.
16. backlight module as claimed in claim 13 is characterized in that the material of this first conductive layer and this second conductive layer wherein comprises the oxide of metal or this metal.
17. backlight module as claimed in claim 16 is characterized in that wherein this metal comprises nickel, gold, silver or copper.
18. backlight module as claimed in claim 13 is characterized in that wherein this inert gas is to be selected from helium, neon, argon gas, krypton gas, xenon and combination thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101531648A CN101399156B (en) | 2007-09-28 | 2007-09-28 | Cold-cathode lamp tube and backlight module using the cold-cathode lamp tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101531648A CN101399156B (en) | 2007-09-28 | 2007-09-28 | Cold-cathode lamp tube and backlight module using the cold-cathode lamp tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101399156A CN101399156A (en) | 2009-04-01 |
| CN101399156B true CN101399156B (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101531648A Expired - Fee Related CN101399156B (en) | 2007-09-28 | 2007-09-28 | Cold-cathode lamp tube and backlight module using the cold-cathode lamp tube |
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| CN (1) | CN101399156B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1570723A (en) * | 2003-07-11 | 2005-01-26 | 友达光电股份有限公司 | Electromagnetic interference proof luminous tube and backlight module for light source of liquid crystal display |
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2007
- 2007-09-28 CN CN2007101531648A patent/CN101399156B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1570723A (en) * | 2003-07-11 | 2005-01-26 | 友达光电股份有限公司 | Electromagnetic interference proof luminous tube and backlight module for light source of liquid crystal display |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平10-302720A 1998.11.13 |
| JP特开平11-213954A 1999.08.06 |
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| CN101399156A (en) | 2009-04-01 |
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Granted publication date: 20100609 Termination date: 20120928 |