CN101388318B - Cold cathode fluorescent tube and LCD device backlight module adopting the same - Google Patents
Cold cathode fluorescent tube and LCD device backlight module adopting the same Download PDFInfo
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- CN101388318B CN101388318B CN2007101215509A CN200710121550A CN101388318B CN 101388318 B CN101388318 B CN 101388318B CN 2007101215509 A CN2007101215509 A CN 2007101215509A CN 200710121550 A CN200710121550 A CN 200710121550A CN 101388318 B CN101388318 B CN 101388318B
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Abstract
The invention relates to a cold cathode tube and a liquid crystal display device backlight module, wherein the tube comprises a tube which can transmit lights, inert gas in the tube, a phosphor which is coated on the inner side of the tube walls, a first electrode which is penetrated on the first end of the tube, and a second electrode which is penetrated on the second end of the tube, wherein the luminous area of a first end side is smaller than that of the second end side in two sections of tube which have equal distances from the two end portions of the tube. The backlight module comprises a reflecting plate, a light plate, a backlight lamp and a backlight lamp reflecting plate, wherein the backlight lamp adopts the cold cathode tube, and is arranged on the side of the light plate, and the backlight reflecting plate is arranged outside of the backlight lamp. The cold cathode tube and the backlight module in the invention can reduce the brightness differences on the two ends of the tube, and increases the surface evenness of incident liquid crystal panel light source from the light plate, thereby improving the display effect.
Description
Technical field
The present invention relates to the liquid crystal indicator module backlight of a kind of cold cathode fluorescent lamp and employing cold cathode fluorescent lamp, relate in particular to a kind of cold-cathode diode, and adopt this cold-cathode diode as the liquid crystal indicator of backlight module backlight.
Background technology
At various liquid crystal indicators module backlight, especially Thin Film Transistor-LCD (ThinFilm Transistor-Liquid Crystal Display, hereinafter to be referred as TFT-LCD) module backlight in, backlight adopts cold-cathode diode (C FL) usually, CCFL is a kind of linear fluorescent tube, is arranged on the both sides of light guide plate, and is parallel with the edge of light guide plate, through the backlight reflecting plate light that CCFL penetrates is reflected in the light guide plate, becomes the backlight of liquid crystal indicator.There is luminance difference in both sides but the inventor finds the CCFL fluorescent tube, and this can influence display effect.
Lamp tube ends exists the reason of luminance difference to be: the structure of conventional fluorescent lamps pipe as shown in Figure 1, generally include: Transparent lamp tube 1, be coated in the fluorophor of Transparent lamp tube 1 tube wall inboard, be filled with inert gas in the fluorescent tube 1, for example: neon (Ne) and argon (Ar) mist, wherein contain micro-mercury vapor, can be several milligrams (mg), in order to make the fluorophor Discharge illuminating, needing at Transparent lamp tube 1 two ends positive electrode 2 to be set is first electrode, with i.e. second electrode of negative electrode 3, just connect, negative electrode 2,3 end generally also can be provided with the electrode connection device 4 that is used to install backlight, 5, during work, by applying a high pressure at positive electrode 2 and negative electrode 3, high-frequency electric field, then mercury vapor is excited in this electric field, promptly produce and release the energy luminescent effect, emit wavelength is the ultraviolet of 253.7 nanometers (nm), the fluorophor atom of fluorescent tube 1 inwall is then because of ultraviolet ray excited its energy rank that promote, when atom returns former low energy rank, radiate visible light, this wavelength of visible light is by the characteristic decision of fluorophor material.But, positive electrode 2 is different with the voltage of negative electrode 3, and this has caused fluorescent tube 1 positive and negative electrode 2,3 both sides fluorophor to be excited energy not waiting, so the luminosity difference of unit are, when the light-emitting area at fluorescent tube 1 two ends was identical, then luminance difference will appear in fluorescent tube 1 two ends.
The general structure of liquid crystal indicator module backlight comprises shown in Fig. 2 A and 2B: be arranged on undermost reflecting plate 10; On reflecting plate 10, line source is changed into the light guide plate 11 of area source; Following diffusion sheet 12, the last diffusion sheet 15 that will disperse from the light that light guide plate 11 penetrates; To carry out the following prismatic lens 13 of optically focused, last prismatic lens 14 from the light that descends diffusion sheet 12 to penetrate; Be arranged on light guide plate 11 both sides, the backlight 16 parallel with light guide plate 11 edges is enclosed in backlight 16 outsides, backlight 16 light is reflected into the backlight reflecting plate 17 of light guide plate 11.When the backlight that has the problems referred to above is applied in the liquid crystal indicator module backlight, can influence the surface uniformity of back light source brightness, when light is injected light guide plate 11, can there be luminance difference in the area source that forms, be illustrated in figure 3 as when adopting common CCFL, the schematic diagram of simulation calculation liquid crystal panel surface brightness, among the figure in the square frame numerical value be the mean value of the interior brightness of this boxed area, obviously, at the brightness of positive electrode 2 one sides of backlight 16 brightness value height than negative electricity machine 3 one sides.The luminance difference at backlight two ends causes the lack of homogeneity of liquid crystal panel backlight surface brightness, and this will inevitably impact display effect.
In order to solve the problem of luminance difference, in the backlight reflecting plate of a kind of technical scheme trial with LCD light guide plate one side of prior art, the positive and negative electrode of a plurality of backlight lighting tubes of original setting connects, the positive electrode that is about to first pipe connects the negative electrode of second pipe, with the brightness in average entire backlight source.Do the problem that not only can not avoid luminance difference fully like this, and the fluorescent tube that changes the positive and negative electrode position need be provided with extra connecting line and connect its positive and negative electrode, and tend to frequently occur the phenomenon of leakage of current at the connecting line position.In addition, voltage difference is also arranged in the connecting line, in order to guarantee the positive electrode voltage of last root fluorescent tube, need to improve the positive electrode magnitude of voltage of first fluorescent tube, promptly improve its driving voltage, the increase of driving voltage can cause the depletion rate of this lamp tube electrode to be accelerated, the response frequency of fluorophor increases, can reduce the useful life of fluorescent tube, when the brightness of fluorescent tube be lower than original brightness 50% the time think that then the life-span of fluorescent tube expires, therefore this solution has certain defective.
Prior art does not still have effective solution to the two ends luminance difference of backlight of LCD (LCD Module).
Summary of the invention
Main purpose of the present invention is to provide a kind of cold cathode fluorescent lamp by some embodiment, can reduce the luminance difference at these backlight two ends.
A further object of the present invention is to provide a kind of liquid crystal indicator module backlight that adopts cold cathode fluorescent lamp by some embodiment again, can reduce the luminance difference at backlight two ends, improve the surface uniformity of module incident liquid crystal panel light-source brightness backlight, thereby improve the display effect of liquid crystal indicator.
For realizing main purpose of the present invention, the present invention provides a kind of cold cathode fluorescent lamp by some embodiment, the fluorescent tube that comprises transmit light, be arranged on the inert gas in the fluorescent tube, be coated in the fluorophor of tube wall inboard, be located in first electrode and second electrode that is located in fluorescent tube second end of fluorescent tube first end, described first electrode and second electrode along straight line over against setting, wherein: respectively in two sections fluorescent tubes apart from this lamp tube ends portion equidistance, the light-emitting area of the first distolateral fluorescent tube is less than the light-emitting area of the second distolateral fluorescent tube.
Cold cathode fluorescent lamp in the technique scheme, make in two sections fluorescent tubes of fluorescent tube apart from the both ends equidistance, near second electrode, the light-emitting area of that section fluorescent tube that is negative electrode one side is greater than near first electrode, it is the light-emitting area of that section fluorescent tube of positive electrode one side, thereby total luminosity of negative electrode one side is increased, and then reduce the luminance difference of lamp tube ends.
For realizing a further object of the present invention, the present invention provides a kind of liquid crystal indicator module backlight that adopts cold cathode fluorescent lamp by some embodiment again, comprise: reflecting plate, light guide plate, following prismatic lens, last prismatic lens, backlight and backlight reflecting plate, wherein: described reflecting plate is arranged on the below of light guide plate, and backlight adopts this cold cathode fluorescent lamp, and be arranged on the side of light guide plate, this backlight reflecting plate is arranged on the outside of this backlight.
The liquid crystal indicator that technique scheme provided module backlight, adopt cold cathode fluorescent lamp of the present invention as backlight, the luminance difference of backlight both sides is reduced, thereby can improve the face uniformity of backlight incident liquid crystal panel light-source brightness, and then improve the display effect of liquid crystal indicator.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Description of drawings
Fig. 1 is the structural representation of prior art backlight.
Fig. 2 A is the side-looking section of structure of liquid crystal indicator module backlight in the prior art.
Fig. 2 B is the plan structure profile of liquid crystal indicator module backlight in the prior art.
Fig. 3 is the simulation result schematic diagram of liquid crystal indicator brightness of backlight in the prior art.
Fig. 4 is the structural representation one of cold cathode fluorescent lamp specific embodiment one of the present invention.
Fig. 5 is the structural representation two of cold cathode fluorescent lamp specific embodiment one of the present invention.
Fig. 6 is the structural representation of cold cathode fluorescent lamp specific embodiment two of the present invention.
Fig. 7 A adopts the main TV structure figure of the liquid crystal indicator module specific embodiment one backlight of cold cathode fluorescent lamp for the present invention.
Fig. 7 B adopts the plan structure figure of the liquid crystal indicator module specific embodiment one backlight of cold cathode fluorescent lamp for the present invention.
Fig. 8 adopts the structural representation of the liquid crystal indicator module specific embodiment two backlight of cold cathode fluorescent lamp for the present invention.
Among the figure:
1 fluorescent tube, 2 positive electrodes, 3 negative electrodes
4 electrode connection devices, 5 electrode connection devices, 10 reflecting plates
13 times prismatic lenses of 12 times diffusion sheets of 11 light guide plate
17 backlight reflecting plates
Embodiment
The different basic reason of CCFL lamp tube ends brightness is the electrode voltage difference of lamp tube ends, unit are is stimulated and light ray energy difference that luminous fluorophor sends, be that the unit light-emitting area exists luminance difference, the lamp tube ends light-emitting area of existing CCFL backlight is identical, so total brightness is inequality in unit light-emitting area brightness not simultaneously.Based on the above-mentioned result that researchs and analyses, basic ideas of the present invention are the light-emitting areas that change the light two ends, adopt the luminance difference of the bigger light-emitting area unit of remedying light-emitting area at the low end of electrode voltage.Promptly the axial direction with fluorescent tube is a length direction, and the unit length light-emitting area of fluorescent tube that makes positive electrode side is less than the unit length light-emitting area of the fluorescent tube of negative electrode side.Shape by the appropriate design fluorescent tube, preferred implementation is that to make positive electrode side fluorescent tube unit length light-emitting area be 3%～20% of negative electrode side fluorescent tube unit length light-emitting area, in other words, in two sections fluorescent tubes apart from lamp tube ends portion same distance respectively, the light-emitting area that makes the first distolateral fluorescent tube is less than the second distolateral lamp luminescence area, for its 3%～20%.On the fluorescent tube unit length, light-emitting area * unit light-emitting area brightness income value is reached unanimity, thereby reduce the luminance difference that lamp tube ends produces because of the electrode voltage difference, improve the uniformity of backlight fluorescent tube overall brightness, just can further solve the problem of the liquid crystal indicator module brightness irregularities backlight of using this backlight.
Cold cathode fluorescent lamp embodiment one
Be illustrated in figure 4 as the structural representation of cold cathode fluorescent lamp specific embodiment one of the present invention, the fluorescent tube 1 that comprises transmit light, usually be special-purpose glass tube, be arranged on the inert gas in the fluorescent tube 1, be coated in the fluorophor of fluorescent tube 1 tube wall inboard, the positive electrode 2 that is located in fluorescent tube 1 first end is first electrode, with i.e. second electrode of the negative electrode 3 that is located in fluorescent tube 1 second end, during work, the voltage of positive electrode 2 is higher than the voltage of negative electrode 3, wherein, this light 1 is the cylindrical tube of equal diameters, first distolateral, promptly the axis of the fluorescent tube of positive electrode 2 sides is a linear, and second is distolateral, the axis that is the fluorescent tube of negative electrode 3 sides is a spirality, the radius of fillet of tube helix tube section is L, as shown in Figure 4, then the fluorescent tube 1 unit length light-emitting area of negative electrode 3 sides be positive electrode 2 sides 2 π L doubly.
In the present embodiment, the radius of fillet of spiral section fluorescent tube can equate, also can reduce gradually since second end, and its planform as shown in Figure 5.
The technical scheme of present embodiment, in the equidistant two sections fluorescent tubes in fluorescent tube 1 both ends, the light-emitting area of positive electrode 2 side lamp pipes 1 is less than the light-emitting area of negative electrode 3 side lamp pipes 1, then when the brightness of positive and negative electrode 2,3 side lamp pipes 1 unit light-emitting area does not wait, two ends overall brightness difference reduces, according to simulation calculation, can be effectively the luminance difference of fluorescent tube 1 both sides be reduced by 9.4%.
In the present embodiment, change the method that fluorescent tube length increases light-emitting area and be not limited to above-mentioned thread-shaped fluorescent tube, can also adopt as snake type or other shaped forms fluorescent tube as the axis shape.
Cold cathode fluorescent lamp embodiment two
Be illustrated in figure 6 as the structural representation of cold cathode fluorescent lamp specific embodiment two of the present invention, the difference of present embodiment and embodiment one is the shape of fluorescent tube 1, as shown in Figure 6, fluorescent tube 1 be shaped as cone, first end, promptly fluorescent tube 1 diameter of positive electrode 2 sides is less than second end, i.e. fluorescent tube 1 diameter of negative electrode 3 sides, to second end, fluorescent tube 1 diameter increases progressively from first end.
The technical scheme of present embodiment two, make fluorescent tube 1 from first end to second end, on its axial direction, the light-emitting area of fluorescent tube evenly increases progressively, and fluorescent tube brightness is in the axial direction reached unanimity, the two ends luminance difference effectively reduces.
In embodiment two, the shape of cross section of fluorescent tube can also be the shapes such as ellipse of alternation, and the bus of cone can be straight line, also can be curve.Bottom edge at cone can also further be made into rounded corner, so that processing and installation.And, to can all being designed to cone second end, perhaps also can only one section cone be set from first end since second end, then connect one section cylinder fluorescent tube.
In the foregoing description one and two, consider from setting angle, often at distance negative electrode certain distance,, make things convenient at negative electrode one end installing electrodes jockey like this as the position of 5mm original position as fluorescent tube maximum unit length light-emitting area.
Adopt the liquid crystal indicator module embodiment one backlight of cold cathode fluorescent lamp
Be respectively the present invention and adopt the front view and the partial top view of the liquid crystal indicator module specific embodiment one backlight of cold cathode fluorescent lamp shown in Fig. 7 A and 7B, present embodiment comprises: be arranged on undermost reflecting plate 10; On reflecting plate 10, line source is changed into the light guide plate 11 of area source; Following diffusion sheet 12, the last diffusion sheet 15 that will disperse from the light that light guide plate 11 penetrates; The following prismatic lens 13 of optically focused, last prismatic lens 14 will be carried out from the light that descends diffusion sheet 12 to penetrate, blooming piece can be increased or reduce in actual applications as required; Be arranged on light guide plate 11 both sides, the backlight 16 parallel with light guide plate 11 edges is enclosed in backlight 16 outsides, and backlight 16 light are reflected into the backlight reflecting plate 17 of light guide plate 11, the support frame that also is necessary in addition.
In the present embodiment, backlight 16 adopts arbitrary embodiment of cold cathode fluorescent lamp of the present invention, need not to transform the structure of backlight reflecting plate 17, backlight 16 is directly installed in the backlight reflecting plate 17, make and keep certain space D between itself and the light guide plate 11, preferred embodiment be to make minimum range between backlight 16 and the light guide plate 11 more than or equal to 0.5 millimeter, and keep the axis of backlight 16 parallel with the edge of light guide plate 11, be depicted as the vertical view of present embodiment, D=0.5 millimeter as Fig. 7 B.
The technical scheme of present embodiment can be passed through the less luminance difference in backlight 16 two ends, improves the surface uniformity of module incident liquid crystal panel light-source brightness backlight, thereby improves display effect.
Adopt the liquid crystal indicator module embodiment two backlight of cold cathode fluorescent lamp
Be illustrated in figure 8 as the partial structurtes schematic diagram that the present invention adopts the liquid crystal indicator module specific embodiment two backlight of cold cathode fluorescent lamp, the difference of present embodiment and the foregoing description one is, the positive electrode of two backlights 16 that are provided with in a backlight reflecting plate 17 is arranged on same side, negative electrode is arranged on same side, does not contact between the fluorescent tube of two backlights 16.
In the technical scheme of present embodiment, can plural backlight 16 be set in a backlight reflecting plate 17 further, to adapt to the brightness needs of liquid crystal indicator.
By the technical scheme of cold cathode fluorescent lamp the foregoing description of the present invention, even cold cathode fluorescent lamp left and right sides, promptly (HOT, luminous total amount GND) overcome the luminance difference of CCFL fluorescent tube left and right sides to the positive and negative electrode side.When further this cold cathode fluorescent lamp being applied among the module embodiment backlight of liquid crystal indicator, can improve the brightness uniformity of liquid crystal indicator module backlight, overcome the defective that prior art can not solve liquid crystal indicator module left and right sides backlight luminance difference, satisfy simultaneously and propose in TCO03 (the The SwedishConfederation of Professional Employees) standard: make that to detect the backlight source of liquid crystal display apparatus brightness value zone that obtains in different angles consistent, promptly improve the surface uniformity of back light source brightness.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. cold cathode fluorescent lamp, the fluorescent tube that comprises transmit light, be arranged on the inert gas in the described fluorescent tube, be coated in the fluorophor of described tube wall inboard, be located in first electrode and second electrode that is located in described fluorescent tube second end of described fluorescent tube first end, described first electrode and second electrode along straight line over against setting, it is characterized in that: respectively in two sections fluorescent tubes of the described lamp tube ends of distance portion equidistance, the light-emitting area of the first distolateral fluorescent tube is less than the light-emitting area of the second distolateral fluorescent tube.
2. cold cathode fluorescent lamp according to claim 1 is characterized in that: on the axial direction at described fluorescent tube from first end to second end, the light-emitting area of described fluorescent tube increases progressively.
3. cold cathode fluorescent lamp according to claim 1 is characterized in that: the equal diameters of described fluorescent tube, respectively in two sections fluorescent tubes of the described lamp tube ends of distance portion same distance, the first distolateral fluorescent tube length is less than the second distolateral fluorescent tube length.
4. cold cathode fluorescent lamp according to claim 3 is characterized in that: the described first distolateral fluorescent tube axis is a linear, and the described second distolateral fluorescent tube axis is spirality or shaped form.
5. according to claim 3 or 4 described cold cathode fluorescent lamp, it is characterized in that: from first distolateral to the second distolateral axial direction, the diameter of thread reduces gradually at described helical lamp.
6. cold cathode fluorescent lamp according to claim 1 is characterized in that: the axis of described fluorescent tube is a linear, and the diameter of the described first distolateral fluorescent tube is less than the diameter of the described second distolateral fluorescent tube.
7. cold cathode fluorescent lamp according to claim 6 is characterized in that: described fluorescent tube is cone or conoid.
8. according to the described arbitrary cold cathode fluorescent lamp of claim 1-7, it is characterized in that: respectively in two sections fluorescent tubes of the described lamp tube ends of distance portion same distance, the light-emitting area of the first distolateral fluorescent tube is 3%～20% of the second distolateral lamp luminescence area.
9. liquid crystal indicator module backlight that adopts the described cold cathode fluorescent lamp of arbitrary claim in the claim 1～8, comprise: reflecting plate, light guide plate, backlight and backlight reflecting plate, it is characterized in that: described reflecting plate is arranged on the below of light guide plate, described backlight adopts described cold cathode fluorescent lamp, is arranged on the side of described light guide plate, and described backlight reflecting plate is arranged on the outside of described backlight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101215509A CN101388318B (en) | 2007-09-10 | 2007-09-10 | Cold cathode fluorescent tube and LCD device backlight module adopting the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101215509A CN101388318B (en) | 2007-09-10 | 2007-09-10 | Cold cathode fluorescent tube and LCD device backlight module adopting the same |
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| Publication Number | Publication Date |
|---|---|
| CN101388318A CN101388318A (en) | 2009-03-18 |
| CN101388318B true CN101388318B (en) | 2010-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101215509A Expired - Fee Related CN101388318B (en) | 2007-09-10 | 2007-09-10 | Cold cathode fluorescent tube and LCD device backlight module adopting the same |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2261088Y (en) * | 1995-11-03 | 1997-08-27 | 张效根 | Cold-cathod staircase-fluorescent-lamp safety connector |
| CN2389417Y (en) * | 1999-09-20 | 2000-07-26 | 葛世潮 | Large power cold cathode fluorscent lamp |
| CN2630639Y (en) * | 2003-06-03 | 2004-08-04 | 杨春峰 | Cold-cathode soft-light lamp |
| CN2694472Y (en) * | 2004-05-21 | 2005-04-20 | 上海翔山实业有限责任公司 | Total spiral cold cathode fluorescent lamp |
| CN2874766Y (en) * | 2005-12-26 | 2007-02-28 | 葛世潮 | Circular cold cathode fluorscent lamp |
-
2007
- 2007-09-10 CN CN2007101215509A patent/CN101388318B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2261088Y (en) * | 1995-11-03 | 1997-08-27 | 张效根 | Cold-cathod staircase-fluorescent-lamp safety connector |
| CN2389417Y (en) * | 1999-09-20 | 2000-07-26 | 葛世潮 | Large power cold cathode fluorscent lamp |
| CN2630639Y (en) * | 2003-06-03 | 2004-08-04 | 杨春峰 | Cold-cathode soft-light lamp |
| CN2694472Y (en) * | 2004-05-21 | 2005-04-20 | 上海翔山实业有限责任公司 | Total spiral cold cathode fluorescent lamp |
| CN2874766Y (en) * | 2005-12-26 | 2007-02-28 | 葛世潮 | Circular cold cathode fluorscent lamp |
Non-Patent Citations (1)
| Title |
|---|
| 全文. |
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Owner name: JINGDONGFANG SCIENCE AND TECHNOLOGY GROUP CO., LTD Free format text: FORMER OWNER: BEIJING BOE PHOTOELECTRICITY SCIENCE + TECHNOLOGY CO., LTD. Effective date: 20141209 Owner name: BEIJING BOE PHOTOELECTRICITY SCIENCE + TECHNOLOGY Effective date: 20141209 |
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Effective date of registration: 20141209 Address after: 100015 Jiuxianqiao Road, Beijing, No. 10, No. Patentee after: BOE Technology Group Co., Ltd. Patentee after: Beijing BOE Photoelectricity Science & Technology Co., Ltd. Address before: 100176 Beijing economic and Technological Development Zone, West Central Road, No. 8 Patentee before: Beijing BOE Photoelectricity Science & Technology Co., Ltd. |
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