CN1570723A - Electromagnetic interference proof luminous tube and backlight module for light source of liquid crystal display - Google Patents
Electromagnetic interference proof luminous tube and backlight module for light source of liquid crystal display Download PDFInfo
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- CN1570723A CN1570723A CN 03146434 CN03146434A CN1570723A CN 1570723 A CN1570723 A CN 1570723A CN 03146434 CN03146434 CN 03146434 CN 03146434 A CN03146434 A CN 03146434A CN 1570723 A CN1570723 A CN 1570723A
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Abstract
This invention discloses an electromagnetic-interference proof tube and apheliotropic module used in the light source of LCD display to prevent the electromagnetic-interference generated by the tube to the LCD display. The tube comprises a closed tube on both ends of which are separately connected with a electronegative potential end and a hot end to provide a electric field within which the gas in the tube discharges light and electricity. At the same time, there coated a film of fluorescence to turn ultraviolet light generated from electricity and light discharging into visible light. Moreover, there coated a transparent electricity-conductive film in outside wall of tube which is connected with electronegative potential end or earth to isolate the electromagnetic wave generated by gas discharge.
Description
Technical field
The present invention relates to a kind of fluorescent tube that is used for the LCD light source, especially a kind of backlight module that is used for the anti-electromagnetic interference (EMI) type fluorescent tube of LCD light source and uses this fluorescent tube.
Background technology
LCD (Liquid Crystal Display, LCD) the self luminous display of right and wrong, unlike other cathode-ray tube (CRT) (Cathode Ray Tube, CRT), plasma display panel (Plasma Panel Display, PDP), organic electro-luminescent display (Organic Light Emitting Diode, OLED) can be luminous voluntarily, LCD need utilize other light source as illumination.
LCD display basic one has four kinds of display modes: reflective, reflection and transmission change type, projection-type and transmission-type; Reflective liquid-crystal display borrows the light source in the space of living in to inject in the LCD plate, light is reflexed in people's the eye by its reflecting plate again; The reflection and transmission change type is can be as reflective when light source is sufficient in the space, and utilizes built-in light source as illumination when light is not enough in the space; Projection-type is to utilize similar movie principle, utilize projection light with the shown image projecting that comes out of LCD to long-range bigger screen; Transmissive type liquid crystal display is to utilize built-in light source fully.Wherein, LCD adopts the transmission-type display mode more now.
Common transmissive type liquid crystal display light source is positioned at the rear of LCD, be called backlight module (BackLight Module, BL).As shown in Figure 1, conventional liquid crystal 1 includes a LCD MODULE 10 and a backlight module 20, wherein, LCD MODULE 10 is positioned at the place ahead of backlight module 20, and backlight module 20 includes more than one fluorescent tube 21, a light guide plate 22 (Light Guide Panel or LGP), a diffusion barrier 23 (Diffuser) and a prismatic lens 24 (Prism Sheet or title blooming, brightening piece); When light after fluorescent tube 21 penetrates, via the scattering direction of light guide plate 22 guiding light, and, evenly penetrate LCD MODULE 10 via diffusion barrier 23 and prismatic lens 24 optically focused.
(ColdCathode Fluorescent Lamp CCFL) provides light source to the cold cathode fluorescent lamp of the backlight module 20 main employing low-pressure mercury fluorescent lamp designs of large size panel; As shown in Figure 2, traditional cold cathode fluorescent lamp 30 includes an airtight body 31, and airtight body 31 two ends are connected to a cold end 32 and a hot end 33 respectively, to provide cold cathode fluorescent lamp 30 luminous required electric fields, simultaneously, the inner face in airtight body 31 is coated with a fluorescent coating 34.
The principle of luminosity of cold cathode fluorescent lamp is similar to fluorescent tube, relies on the energy state (state) of gas atom in the fluorescent tube to convert radioluminescence to, and general the most frequently used discharge medium is a mercury vapour; Simultaneously, in fluorescent tube, be filled with inert gas such as Ar, Kr, Ne etc. as auxiliary; After high-tension electricity input cold cathode fluorescent lamp, free electron in the airtight fluorescent tube is quickened by electric field and excites the Ar atom, the Ar that is excited allows mercury atom dissociate again and produces radioluminescence, above-mentioned radioluminescence mainly contains the ultraviolet light (UV-Ra-diation) of 235.7nm and two kinds of wavelength of 185nm, wherein, the ultraviolet radiation efficient of 235.7nm wavelength is bigger; The fluorescent coating 34 of ultraviolet excitation CCFL tube wall produces visible light, simultaneously, by the prescription of adjusting fluorescent coating 34, can send the light of different-colour, as red partially or inclined to one side indigo plant, to meet the requirement of different displays.
Need high voltage owing to drive cold cathode fluorescent lamp, and high voltage is easy to generate electromagnetic wave, with the normal demonstration of interference LCD 1, and generation is flashed or water ripple phenomenon; For the electromagnetic wave of avoiding cold cathode fluorescent lamp to produce disturbs the normal demonstration generation of LCD 1, as shown in Figure 3, conventional art is to add an ITO diaphragm 25, these ITO diaphragm 25 ground connection between backlight module 20 and LCD MODULE 10; Because ITO diaphragm 25 is transparent, and has electric conductivity; Therefore, a unlikely light penetration LCD MODULE 10 that cold cathode fluorescent lamp is produced exerts an influence, and second can provide adequate shielding to LCD MODULE 10, with the electromagnetic wave of isolated cold cathode fluorescent lamp generation.
Yet, following shortcoming will be arranged after increasing above-mentioned ITO diaphragm 25:
One, in backlight module 20, behind the adding one ITO diaphragm 25, will increase the thickness of backlight module 20, promptly increase the thickness of LCD 1.
Two,, thereby increase the difficulty that backlight module 20 designs owing to ITO diaphragm 25 necessary ground connection.
Three, increase the ITO diaphragm 25 of ground connection, will increase the assembly cost of LCD 1.
Four, for to keep good transmittance, the thickness of above-mentioned ITO diaphragm 25 only has 0.1～0.2mm usually, and enough resistance to deformation intensity can't be provided, and therefore, when assembling liquid crystal display, ITO diaphragm 25 is easy to generate distortion and influences display quality.
In view of this, the creator among the present invention has proposed a kind of anti-electromagnetic interference (EMI) type fluorescent tube to replace above-mentioned traditional tube, can omit the ITO diaphragm 25 that is used for isolated cold cathode fluorescent lamp light source and LCD MODULE 10 by this.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of fluorescent tube of anti-electromagnetic interference (EMI) type, is used to provide the light source of LCD.
The anti-electromagnetic interference (EMI) type fluorescent tube that is used for the LCD light source among the present invention includes an airtight body, be connected to a cold end and a hot end respectively at the two ends of airtight body, so that the required electric field of gas atom Discharge illuminating in the airtight body to be provided, be filled with mercury vapour and inert gas in this airtight body, borrow high electric field to make the gas atom radiation produce ultraviolet light; Simultaneously, be coated with a fluorescent coating at the inner face of airtight body, above-mentioned ultraviolet light is absorbed by fluorescent coating, and by this, this fluorescent coating gives off visible light;
The outside of this airtight body is coated with an electrically conducting transparent coating fully, and this electrically conducting transparent coating is connected to cold end.
Fluorescent tube among the present invention is because in gas atom Discharge illuminating process, the inevitable electromagnetic wave that produces other wavelength, and may the normal demonstration of LCD be exerted an influence, therefore, the shield effectiveness that is provided by electrically conducting transparent coating, and the unlikely normal illumination that influences fluorescent tube, more can completely cut off may be to the normal electromagnetic wave that exerts an influence that shows of LCD.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment among the present invention is described in further detail.
Fig. 1 is the synoptic diagram of conventional liquid crystal;
Fig. 2 is the synoptic diagram of traditional cold cathode fluorescent lamp;
Fig. 3 is the synoptic diagram that adds in the conventional art behind the ITO diaphragm with the shielding cold cathode fluorescent lamp;
Fig. 4 A is vertical cross-sectional schematic of anti-electromagnetic interference (EMI) type fluorescent tube among the present invention;
Fig. 4 B is the horizontal cross-sectional schematic of anti-electromagnetic interference (EMI) type fluorescent tube among the present invention;
Fig. 5 is the synoptic diagram of another anti-electromagnetic interference (EMI) type fluorescent tube among the present invention;
Fig. 6 utilizes the synoptic diagram of the anti-electromagnetic interference (EMI) type fluorescent tube of the present invention as the LCD of illumination.
Embodiment
Shown in Fig. 4 A and Fig. 4 B, anti-electromagnetic interference (EMI) type fluorescent tube 30 is that example specifies with a typical cold cathode fluorescent lamp among the present invention, should comprise an airtight body 31 by anti-electromagnetic interference (EMI) type fluorescent tube 30, be connected to a cold end 32 and a hot end 33 respectively at the two ends of airtight body 31, so that the required electric field of gas atom Discharge illuminating in the airtight body 31 to be provided, the inner face of this airtight body 31 is coated with a fluorescent coating 34, simultaneously, the outside of this airtight body 31 is coated with an electrically conducting transparent coating 35 fully, and this electrically conducting transparent coating 35 is connected to cold end 32.
In airtight body 31 enough electric fields are arranged, the portions of electronics that is positioned at cold end 32 will break away from the constraint of electronics nuclear and form free electron (free electron), and quicken toward hot end 33 to advance via electric field; In addition, usually be filled with mercury vapour and inert gas in the airtight body 31, therefore, in the process that electronics is advanced toward hot end 33 by cold end 32, may with the gas atom generation effect in the airtight body 31, or the energizing gas atom is to higher energy state, or with the gas atom ionization etc.; In this process, except may producing ultraviolet light and visible light, also may produce the electromagnetic wave of other wavelength.
Usually be coated with a fluorescent coating 34 at airtight body 31 inwalls, this fluorescent coating 34 can the higher ultraviolet light of absorption frequency, and discharges the lower visible light of frequency; Yet the electromagnetic wave that frequency is lower (for example: Microwaves, Radiofrequency waves) will be because energy shortage to excite this fluorescent coating 34, will directly penetrate out airtight body 31; The power signal frequency of these electromagnetic frequencies and LCD 1 is suitable, thereby may produce interference to the normal demonstration of LCD 1.
For fear of the above-mentioned electromagnetic wave that penetrates airtight body 31 the normal demonstration generation of LCD 1 is disturbed, present embodiment adds an electrically conducting transparent coating 35, and be covered in the outer wall of airtight body 31 fully, this electrically conducting transparent coating 35 can allow that visible light penetrates, but for the lower electromagnetic wave of frequency, to produce electro-magnetic screen function, to prevent that the lower electromagnetic wave of frequency is dissipated into electrically conducting transparent coating 35 and the normal demonstration generation of LCD 1 is disturbed outward.
For charges accumulated is got rid of rapidly, so that desirable shield effectiveness to be provided, present embodiment is connected directly to cold end 32 with electrically conducting transparent coating 35, to prevent the electric charge accumulation; Simultaneously, because electrically conducting transparent coating 35 is connected directly to cold end 32, can simplify the assembling and the design of the backlight module 20 of anti-electromagnetic interference (EMI) type fluorescent tube 30.
In order to meet above-mentioned demand to electrically conducting transparent coating 35, the preferable selection of electrically conducting transparent coating 35 is to utilize tin indium oxide (ITO) as coating material.
As shown in Figure 5, another embodiment of anti-electromagnetic interference (EMI) type fluorescent tube 30 among the present invention, should comprise an airtight body 31 by anti-electromagnetic interference (EMI) type fluorescent tube 30, the two ends of airtight body 31 are connected to a cold end 32 and a hot end 33 respectively, so that anti-electromagnetic interference (EMI) type fluorescent tube 30 luminous required electric fields to be provided, the inner face of this airtight body 31 is coated with a fluorescent coating 34, simultaneously, the outside of airtight body 31 is coated with an electrically conducting transparent coating 35 fully, these electrically conducting transparent coating 35 ground connection.
In the present embodiment, mat is electrically conducting transparent coating 35 direct ground connection, charges accumulated got rid of, so that more excellent shield effectiveness to be provided rapidly.
As shown in Figure 6, utilize and prevent among the present invention that electromagnetic interference (EMI) type fluorescent tube 30 comprises a LCD MODULE 10 and a backlight module 20 as the LCD 1 of illumination, this LCD MODULE 10 is installed in the place ahead of backlight module 20.
LCD MODULE 10 includes a plurality of display units, with the displaying contents of decision LCD 1.
Backlight module 20 comprises at least one anti-electromagnetic interference (EMI) type fluorescent tube 30, a light guide plate 22, at least one diffusion barrier 23 and a prismatic lens 24; Wherein, anti-electromagnetic interference (EMI) type fluorescent tube 30 can visible emitting, and the light source of backlight module 20 is provided; The light that the anti-electromagnetic interference (EMI) type fluorescent tube 30 of light guide plate 22 guiding is launched makes light this LCD MODULE 10 of directive forward; Diffusion mould 23 and prismatic lens 24 are installed in the place ahead of light guide plate 22, are used for converging ray, to provide LCD MODULE 10 higher brightness.
Above-mentioned each anti-electromagnetic interference (EMI) type fluorescent tube 30 includes an electrically conducting transparent coating 35, and electrically conducting transparent coating 35 is covered in the outside of anti-electromagnetic interference (EMI) type fluorescent tube 30 fully, and these electrically conducting transparent coating 35 ground connection, to reach the effect of electromagnetic screen.
Because anti-electromagnetic interference (EMI) type fluorescent tube 30 of the present invention has the effect of electromagnetic screen, thereby, in backlight module 20, need not increase ITO diaphragm 25 as electromagnetic screen, by this, because of adding the problem that ITO diaphragm 25 is derived, as: problems such as increase backlight module 20 thickness, the difficulty that increases backlight module 20 designs, increase LCD 1 assembly cost all can be overcome.
In addition, because in the anti-electromagnetic interference (EMI) type fluorescent tube 30 of the present invention, electrically conducting transparent coating 35 is covered in tube outer wall, coating can be supported fully and can not be out of shape, and therefore, the aforementioned problem that influences the liquid crystal display quality because of 25 distortion of ITO diaphragm can not produce yet.
In addition; though more than the preferred embodiment among the present invention is described; but can not be as protection scope of the present invention; promptly should be understood that to those skilled in the art; do not breaking away from variation and the modification that to make equivalence under the design spirit of the present invention to it; therefore, every not breaking away from the equivalence variation of having done under the design spirit of the present invention and modification, all should think to fall into protection scope of the present invention.
Claims (10)
1. anti-electromagnetic interference (EMI) type fluorescent tube that is used for the LCD light source comprises:
One airtight body, this airtight body include a cold end and a hot end that is used to provide the required electric field of lamp luminescence, and
One electrically conducting transparent coating, this electrically conducting transparent coating is covered in the outside of airtight body fully, and this electrically conducting transparent coating is connected to cold end.
2. according to the fluorescent tube described in the claim 1, it is characterized in that: described airtight body comprises a fluorescent coating in addition, this fluorescent coating is covered in the inner face of airtight body, and the inside of this airtight body is filled with mercury vapour and inert gas, this intert-gas atoms excites through this electric field, and produce ultraviolet light with the collision of this mercury vapor atoms, excite fluorescent coating to produce visible light.
3. according to the fluorescent tube described in the claim 1, it is characterized in that: described electrically conducting transparent coating is tin indium oxide coating.
4. according to the fluorescent tube described in the claim 1, it is characterized in that: described electrically conducting transparent coating ground connection.
5. cold cathode fluorescent lamp that is used for the anti-electromagnetic interference (EMI) type of LCD light source comprises:
One airtight body, this airtight body comprise a cold end and a hot end that is used to provide the luminous required electric field of cold cathode fluorescent lamp, and,
One electrically conducting transparent coating, this electrically conducting transparent coating is covered in the outside of airtight body fully, and electrically conducting transparent coating is connected to cold end.
6. according to the cold cathode fluorescent lamp described in the claim 5, it is characterized in that: described electrically conducting transparent coating is tin indium oxide coating.
7. according to the cold cathode fluorescent lamp described in the claim 5, it is characterized in that: described electrically conducting transparent coating ground connection.
8. one kind is used for the backlight liquid crystal display module, comprising:
At least one cold cathode fluorescent lamp, these cold cathode fluorescent lamp respectively comprise an electrically conducting transparent coating, and this electrically conducting transparent coating is covered in cold-cathode lamp tube outside and ground connection fully;
At least one light guide plate, this this conduction tabula rasa is adjacent to cold cathode fluorescent lamp, with the direction of guiding cold cathode fluorescent lamp emission light; And
At least one diffusion barrier and at least one prismatic lens, this diffusion barrier and prismatic lens are positioned at the place ahead of light guide plate, to assemble the light through light guide plate.
9. the backlight module described in according to Claim 8, it is characterized in that: described electrically conducting transparent coating is tin indium oxide coating.
10. the backlight module described in according to Claim 8, it is characterized in that: described cold cathode fluorescent lamp respectively comprises a cold end and a hot end, providing cold cathode fluorescent lamp luminous required electric field, and the electrically conducting transparent coating that is covered in the cold-cathode lamp tube outside is connected to cold end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031464343A CN100437289C (en) | 2003-07-11 | 2003-07-11 | Electromagnetic interference proof luminous tube and backlight module for light source of liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031464343A CN100437289C (en) | 2003-07-11 | 2003-07-11 | Electromagnetic interference proof luminous tube and backlight module for light source of liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1570723A true CN1570723A (en) | 2005-01-26 |
| CN100437289C CN100437289C (en) | 2008-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031464343A Expired - Fee Related CN100437289C (en) | 2003-07-11 | 2003-07-11 | Electromagnetic interference proof luminous tube and backlight module for light source of liquid crystal display |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410766C (en) * | 2004-10-18 | 2008-08-13 | 中华映管股份有限公司 | Backlight module and liquid crystal display |
| CN101399156B (en) * | 2007-09-28 | 2010-06-09 | 诚创科技股份有限公司 | Cold-cathode lamp tube and backlight module using the cold-cathode lamp tube |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH055883A (en) * | 1991-06-26 | 1993-01-14 | Tama Electric Co Ltd | Back light illuminating device |
| JPH06194641A (en) * | 1992-12-25 | 1994-07-15 | Sanyo Electric Co Ltd | Liquid crystal display device |
| JP3247643B2 (en) * | 1997-09-10 | 2002-01-21 | インターナショナル・ビジネス・マシーンズ・コーポレーション | Liquid crystal display device |
| TWI286778B (en) * | 2001-02-21 | 2007-09-11 | Samsung Electronics Co Ltd | Lamp, lamp assembly, liquid crystal display device using the same and method for assembling the liquid crystal display device |
-
2003
- 2003-07-11 CN CNB031464343A patent/CN100437289C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410766C (en) * | 2004-10-18 | 2008-08-13 | 中华映管股份有限公司 | Backlight module and liquid crystal display |
| CN101399156B (en) * | 2007-09-28 | 2010-06-09 | 诚创科技股份有限公司 | Cold-cathode lamp tube and backlight module using the cold-cathode lamp tube |
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| Publication number | Publication date |
|---|---|
| CN100437289C (en) | 2008-11-26 |
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