CN2879420Y

CN2879420Y - High optical efficiency low working voltage outer electrode fluorescent lamp

Info

Publication number: CN2879420Y
Application number: CN 200520072780
Authority: CN
Inventors: 英达正; 张晓兵; 童林夙
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2005-06-17
Filing date: 2005-06-17
Publication date: 2007-03-14
Anticipated expiration: 2015-06-17

Abstract

The utility model relates to a high optical efficiency low working voltage outer electrode fluorescent lamp comprising a lamp glass housing sealed at two ends, a fluorescent layer is provided on an inner wall of the lamp glass housing, outer electrodes is provided on outer surfaces of two ends of the lamp glass housing which is filled with discharging gas, a high quadratic electron emitting material medium layer is provided at an inner surface of two ends of the lamp glass housing. The basic theory of the utility model is forming a medium layer having a high quadratic emitting coefficient on the inner surface of two ends of the present outer electrodes fluorescent lamp, increasing number of electrons which perform ionizing collision in a gas discharging region so as to increase the irradiance efficiency, in addition, the utility model also has an advantage of low work voltage.

Description

External electrode fluorescent lamp tube with high light optical effect low operating voltage

Technical field

The utility model relates to a kind of external electrode fluorescent lamp tube with high light optical effect low operating voltage.

Background technology

Cold-cathode fluorescence lamp is a kind of do not need that cathode filament heating, caliber can do very thin (generally below 10mm, as 1.8mm) new type light source, cold-cathode fluorescence lamp has two classes, electrode fluorescence lamp (CCFL) and external-electrode fluorescent lamp (EEFL) promptly. the needed electronics of gas discharge, ion are made of the Secondary Emission of electromerism and electrode in the cold-cathode fluorescence lamp, and these are different by the gas discharge of the thermionic emission formation of hot cathode with hot-cathode fluorescent lamp (HCFL).Interior electrode fluorescence lamp is owing to the luminous efficiency height, and external diameter is especially little, does not need heating simultaneously, and the life-span is long, has therefore obtained extensive use in the especially little place of light source volume requirement, as LCD backlight source, household electrical appliance (refrigerator) illumination etc.But interior electrode fluorescence lamp also has the some shortcomings part, and higher (150～500v), luminous efficiency is lower by about 30% than hot-cathode fluorescent lamp as discharge voltage.In recent years, development along with LCD and LCD TV, internally the demand of electrode fluorescence lamp is increasing. the large scale liquid crystal TV, as 34 inches LCD TV, owing to require the brightness height, reach the luminance level of present picture tube TV, every television set needs about 100 fluorescent tube just can meet the demands.Therefore to have be on backlight to the cost of LCD TV greatly.Reduce the cost of liquid crystal backlight, just need to improve the luminous efficiency of cold-cathode fluorescence lamp, reduce the fluorescent tube use amount or reduce the cost of every fluorescent tube.Because every fluorescent tube need be equipped with inverter power supply and keep the fluorescent tube operate as normal, and the cost of inverter power supply and its operating voltage have much relations, therefore reduce the cost that lamp works voltage can effectively reduce inverter.External-electrode fluorescent lamp has higher brightness and longer life-span with respect to interior electrode fluorescence lamp, can adopt the shared inverter of many fluorescent tubes (as 20 fluorescent tubes) simultaneously, reduces the cost of backlight.

Existing external-electrode fluorescent lamp (EEFL), it has bigger diameter, the gas discharge required voltage is also than higher, being applied to LCD TV now as backlight, can expecting that the application of these cold-cathode fluorescence lamps will develop rapidly. the problem that faces also is to reduce operating voltage and improve luminous efficiency.

Summary of the invention

The utility model provides the external electrode fluorescent lamp tube with high light optical effect low operating voltage of a kind of high-luminous-efficiency, low-work voltage.

Fluorescent lamp described in the utility model adopts following technical scheme:

A kind of liquid crystal backlight or illuminating external electrode fluorescent lamp tube with high light optical effect low operating voltage of can be used as, the tube glass shell that comprises closed at both ends, on the inwall of tube glass shell, be provided with phosphor powder layer, on the outer surface of the two ends of tube glass shell, be provided with outer electrode, in tube glass shell, be filled with discharge gas, on the inner surface of the two ends of tube glass shell, be provided with high secondary electron emission material dielectric layer.Above-mentioned fluorescent lamp technical scheme also is fit to bending, the fluorescent lamp of spirality or other shape.

Compared with prior art, the utlity model has following advantage:

Basic thought of the present utility model is to make the dielectric layer with high secondary emissionratio on the inner surface of existing external-electrode fluorescent lamp pipe two ends, utilize the high secondary electron yield of dielectric material, the electron number that raising is carried out ionizing collision in the gas discharge zone, thus luminous efficiency improved.

The two end inner surfaces that the utility model will have an external-electrode fluorescent lamp pipe of blast pipe are made the dielectric layer of high secondary electron yield, then with the inner surface coated fluorescent material of external-electrode fluorescent lamp pipe, again with the fluorescent glass tubes exhaust. after the exhaust, inert gas and mercury discharge gas are charged into fluorescent glass tubes, then with pipe sealing.The coating of electric conducting material making is arranged on the two ends outer surface of fluorescent glass tubes as sparking electrode. on the sparking electrode of two ends, apply the alternating voltage that produces by inverter during work, electronics moves in fluorescent glass tubes under effect of electric field, because the high secondary electron yield of material increases the secondary electron number greatly and manages interior gas molecule ionizing collision constantly takes place on the lamp tube ends inner surface, and make the pipe in gas discharge, because discharge space is enough big, can form the high positive column discharge of luminous efficiency, by discharge excitation mercury emitting ultraviolet light, ultraviolet excitation fluorescent material sends visible light makes it become light source.Thereby reach the raising luminous efficiency, reduce the purpose of operating voltage.

The utility model is by making dielectric layer on two end inner surfaces of cold-cathode fluorescence lamp, for example has high secondary electron yield material (as magnesium oxide, aluminium oxide etc.) dielectric layer, it is low that expectation will make external-electrode fluorescent lamp have operating voltage, the characteristics that luminous efficiency is high.Can effectively reduce the cost of support circuit, and prolonging lamp tube service life.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is the structural representation that an end afterbody is not covered by the coating fully.

Fig. 3 is the structural representation of external-electrode fluorescent lamp pipe lid.

Fig. 4 is that fluorescent tube is the structural representation of circular ring type.

Fig. 5 is that fluorescent tube is the external structure schematic diagram of spiral type.

Embodiment

A kind of liquid crystal backlight or illuminating external electrode fluorescent lamp tube with high light optical effect low operating voltage of can be used as, the tube glass shell 2 that comprises closed at both ends, on the inwall of tube glass shell 2, be provided with phosphor powder layer 1, on the outer surface of the two ends of tube glass shell 2, be provided with outer electrode 4, in tube glass shell 2, be filled with discharge gas 3, on the inner surface of the two ends of tube glass shell 2, be provided with high secondary electron emission material dielectric layer 5, above-mentioned high secondary electron emission material dielectric layer 5 is a magnesium oxide layer, alumina layer or magnesium aluminate layer, this high secondary electron emission material dielectric layer 5 also can be other high secondary electron emission material, above-mentioned tube glass shell 2 can be straight, bend spirality or other shape.

Claims

1, a kind of liquid crystal backlight or illuminating external electrode fluorescent lamp tube with high light optical effect low operating voltage of can be used as, the tube glass shell (2) that comprises closed at both ends, on the inwall of tube glass shell (2), be provided with phosphor powder layer (1), on the two ends outer surface of tube glass shell (2), be provided with outer electrode (4), in tube glass shell (2), be filled with discharge gas (3), it is characterized in that on the two ends inner surface of tube glass shell (2), being provided with high secondary electron emission material dielectric layer (5).

2, external electrode fluorescent lamp tube with high light optical effect low operating voltage according to claim 1 is characterized in that high secondary electron emission material dielectric layer (5) is magnesium oxide layer, alumina layer or magnesium aluminate layer.