KR20060112376A - Flat fluorescent lamp and the electrode structure of the same - Google Patents

Abstract

A flat fluorescent lamp and an electrode structure of the same are provided to improve a brightness difference by arranging strip type electrodes in a symmetrical state within a discharge tube. A phosphor(111) is coated on a front plate(110). A rear plate(120) includes a reflecting plate(140), a first and a second electrode part having conductivity, a dielectric layer(170), and a phosphor(180). A supporter(130) is installed between the front and the rear plate in order to support the front and the rear plate and form a discharge chamber. The first electrode part is formed with a plurality of first strip type electrodes parallel to each other within the discharge chamber and a first lead electrode located at the outside of the discharge chamber. The second electrode part is formed with a plurality of second strip type electrodes located in parallel between the first electrodes and a second lead electrode located at the outside of the discharge chamber.

Description

Flat fluorescent lamp and the electrode structure of the same

1 is a partially cutaway perspective view of a flat fluorescent lamp according to the present invention;

2 is a view showing a preferred driving circuit for driving a flat fluorescent lamp of the present invention.

       Drawing showing an example,

3 is a view illustrating waveforms of input and output signals of the driving circuit of FIG. 2;

4 is a planar fluorescent lamp according to a first embodiment of the present invention.

       Drawing showing electrode structure,

5A shows luminance uniformity of the flat fluorescent lamp according to the first embodiment of the present invention;

       Drawing showing an example of an experiment,

5B is a diagram showing the luminance uniformity of the flat fluorescent lamp according to the first embodiment of the present invention;

      Figure showing the luminance uniformity of the conventional flat fluorescent lamp for comparison,

6 is a diagram illustrating current characteristics according to electrode widths in a first embodiment of the present invention.

      Showing graph,

7 shows efficiency characteristics according to electrode widths in the first embodiment of the present invention.

      Showing graph,

8 shows discharge start voltages according to electrode spacing in the first embodiment of the present invention.

      Graph showing efficiency characteristics,

9 is a graph showing the relation between pressure and luminance according to electrode spacing in the first embodiment of the present invention.

      Graph showing relationships,

10 illustrates an electrode structure of a flat fluorescent lamp according to a second embodiment of the present invention.

      Showing drawings,

11 is a view illustrating an electrode structure according to the first and second embodiments of the present invention.

      Graph showing current waveform,

12 shows the electrode structure of each of the first and second embodiments of the present invention.

      Graph showing luminance characteristics,

13 and 14 illustrate another deformable embodiment of the electrode structure of the present invention.

      Showing drawings,

15 is a cross-sectional configuration diagram of a conventional flat fluorescent lamp;

16 is a view showing the electrode structure of a conventional flat fluorescent lamp.

<Explanation of symbols for the main parts of the drawings>

100 fluorescent lamp 110 front panel

120: rear panel 130: support

140: reflector 150: first electrode portion

151: (strip type) first electrode 152: first lead electrode

160: second electrode portion 161: (strip type) second electrode

162: second lead electrode 170: dielectric layer

180: phosphor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat fluorescent lamp and an electrode structure of the fluorescent lamp, and more particularly, to a flat fluorescent lamp and an electrode structure capable of minimizing the thickness of the lamp and improving luminance uniformity.

BACKGROUND OF THE INVENTION [0002] As a conventional technique relating to a flat fluorescent lamp, a flat discharge fluorescent lamp having a planar fluorescent lamp having a counter electrode arrangement and a linear electrode disposed on one side thereof is disclosed. In addition, commercially available flat fluorescent lamps include flat fluorescent lamps using a dielectric barrier discharge of Osram, Germany.

Hereinafter, a conventional flat fluorescent lamp will be described with reference to FIGS. 15 and 16.

The fluorescent lamp of FIG. 15 is provided with a supporting frame 30 so that a discharge space is formed between the front glass substrate 10 and the rear glass substrate 20, and an inert gas is filled in the discharge space.

The phosphor layer 11 is coated on the lower surface of the front glass substrate 10.

On the rear glass substrate 20, an electrode 21 having protrusions for partial discharge is formed, a dielectric layer 22 for electrically insulating the electrode 21 and lowering a discharge start voltage, and a phosphor layer 23 are sequentially stacked. do.

FIG. 16 is a view illustrating a planar structure of an electrode provided in the fluorescent lamp of FIG. 15. The electrode 21 is configured by an anode 21a and a cathode 21b and is driven in a DC impulse manner.

The anode 21a and the cathode 21b are each composed of a plurality of strip leads, in particular the anode 21a is composed of a pair, and one cathode 21b is most adjacent to the pair of anodes 21a. The lead is located. A plurality of needle-shaped protrusions for partial discharge are formed in the cathode strip lead.

In the conventional flat fluorescent lamp, when a DC impulse is applied to the anode 21a and the cathode 21b, a delta partial discharge is formed between the projection P of the anode 21a strip lead and the cathode 21b strip lead. This occurs and visible light is emitted.

However, such a conventional flat fluorescent lamp has a cathode structure having a different electrode structure because a cathode made of a pair of strip leads and an anode made of one strip lead with a plurality of protrusions protruding from each other. The problem of inferior luminance uniformity occurs.

In particular, there is a problem that the luminance uniformity is lowered due to the luminance difference generated in the partial discharge of the needle protrusion.

The present invention is to solve the above-mentioned shortcomings. In the electrode structure of the flat fluorescent lamp, the luminance difference caused by the partial discharge in the needle protrusion is solved, so that the stable discharge and the uniform luminance distribution can be achieved. An object of the present invention is to provide a flat fluorescent lamp having a discharge tube structure that can be minimized.

The electrode structure of the flat fluorescent lamp of the present invention comprises a flat discharge tube having a predetermined thickness filled with gas, a conductive electrode portion printed in the discharge tube, a dielectric layer applied to the electrode portion and the discharge tube, In a flat fluorescent lamp comprising a phosphor applied to the dielectric layer, the electrode portion is composed of a plurality of strip-shaped electrodes arranged in parallel and uniformly on one plane inside the discharge tube, the closest to the discharge The strip electrodes are achieved by applying power of opposite polarity to each other.

Next, the electrode structure of the flat fluorescent lamp of the present invention includes a flat discharge tube having a predetermined thickness filled with gas, a conductive electrode portion printed in the discharge tube, a dielectric layer applied to the electrode portion, and the discharge tube; A flat fluorescent lamp comprising a phosphor applied to a portion of the dielectric layer, wherein the electrode part is formed on a plane inside the discharge tube while forming at least two parallel strips in a parallel discharge tube. It consists of a plurality of strip electrodes that are uniformly arranged in, the adjacent strip electrode group can be achieved by applying power of opposite polarity to each other.

Further, the electrode structure of the flat fluorescent lamp of the present invention includes a flat discharge tube having a predetermined thickness filled with gas, a conductive electrode portion printed in the discharge tube, a dielectric layer applied to the electrode portion, and the discharge tube; In the flat fluorescent lamp comprising a phosphor applied to the dielectric layer, the electrode portion is composed of a plurality of strip-like electrodes arranged in parallel and uniformly on one plane inside the discharge tube, the strip-shaped electrode The non-conductive region is formed inside the edge, and at the time of discharge, the most adjacent strip electrodes can be achieved by applying power of opposite polarity.

According to an aspect of the present invention, there is provided a flat fluorescent lamp comprising: a flat panel fluorescent lamp filled with a gas, the front panel having a phosphor coated thereon; A back plate provided with a reflecting plate, first and second electrode portions having conductivity printed so as to be electrically insulated from each other, a dielectric layer, and a phosphor; A support part for maintaining airtightness to support the front plate and the back plate to form a discharge chamber, wherein the first electrode part includes a plurality of strip-shaped first electrodes positioned parallel to each other in the discharge chamber; And a plurality of strip-shaped second electrodes disposed in parallel between the first electrodes, the first lead electrodes being positioned outside the discharge chamber so that the first electrodes are joined. This is accomplished by being made up of a second lead electrode located outside the discharge chamber so that the two electrodes are joined.

Next, the flat fluorescent lamp of the present invention is a flat fluorescent lamp filled with gas, the front plate is coated with a phosphor; A back plate provided with a reflecting plate, first and second electrode portions having conductivity printed so as to be electrically insulated from each other, a dielectric layer, and a phosphor; It is composed of a support for maintaining the airtight so as to support the front plate and the back plate to form a discharge chamber, wherein the first electrode is at least two parallel strips in the discharge chamber in parallel to form a group (group) And a plurality of strip-shaped first electrodes disposed thereon, and a first lead electrode positioned outside the discharge chamber so that the plurality of first electrodes join. The second electrode part is a group of the strip-shaped first electrodes. A plurality of strip-shaped second electrodes arranged in parallel to form a group so that a corresponding number of strips can be symmetrically, and located outside the discharge chamber so that the plurality of second electrodes join. It can be achieved by consisting of a second lead electrode.

First Embodiment

Hereinafter, the first embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, a front plate 110 and a back plate 120 made of a glass substrate, and a support 130 supporting the front plate 110 and the back plate 120 form a discharge chamber.

An inert gas is filled in the discharge tube including the front plate 110, the rear plate 120, and the support 130. As a specific example, argon (Ar) or neon (Ne), krypton (Kr) gas, or the like containing xenon (Xe) gas or xenon (Xe) gas may be filled, and preferably no mercury.

The phosphor 111 is coated on the lower surface of the front plate 110, and the front plate 110 is a light emitting surface of light generated from the fluorescent lamp.

The back plate 120 includes a reflector plate 140, electrode portions 150 and 160 formed of a plurality of strip-shaped electrodes, a dielectric layer 170, and a phosphor 180.

The reflective plate 140 provided on the rear panel 120 reflects light in the direction of the light exit surface to increase light utilization efficiency, and also adjusts the amount of reflection of the entire incident light so that the entire light exit surface of the backlight has a uniform luminance distribution. do.

The dielectric layer 170 electrically insulates the electrode parts 150 and 160 and limits the current.

The phosphor 180 is coated on the top of the dielectric layer 170.

On the other hand, in the embodiment of the present invention, but the support portion 130 is provided on the rim side between the front plate 110 and the rear plate 120 to configure a discharge chamber, a separate support portion to be provided on the front plate and the back plate The discharge space may be formed by bonding the edges of the front plate and the back plate glass using frit glass without the need for a discharge method. In this case, a plurality of spacers are distributed in the space between the front plate and the rear plate to maintain a constant gap between the front plate and the back plate, and phosphors may be coated on the spacers to increase luminous efficiency.

As such, there is an advantage in that the fluorescent lamp panel can be thinned by securing a discharge space by a discharge method without using a separate support part.

In the flat fluorescent lamp of the present invention, the electrode part is composed of a plurality of strip-shaped electrodes arranged parallel to each other and uniformly on one plane inside the discharge tube. It is a technical feature to be applied.

In the present invention, the paste constituting the electrode portion has a small work function, is strong in ionic shock, has excellent conductivity, easily adsorbs dielectric materials, and does not require a special post-treatment process such as activation or aging. desirable. As such an electrode material, a conductive paste such as silver (Ag), nickel (Ni), copper (Cu), or the like may be used.

The flat fluorescent lamp of the present invention is characterized by being driven by a square wave AC pulse power supply.

In the present invention, since the polarity of the AC pulse power source plays the same role, the polarity of the first electrode part and the second electrode part is not distinguished.

Specifically, Figure 2 is a view showing a preferred example of a driving circuit for driving a flat fluorescent lamp of the present invention, by combining four high-speed FETs and a transformer to output a high-voltage square wave AC pulse.

In the state where a DC voltage (+ V) is applied to the drains of Q1 and Q3, an appropriate signal is input to the gate of each FET to obtain a square wave AC pulse. Referring to FIG. 3A, when Q3 and Q4 are 'on' at the same time, voltage is generated approximately '+ V' at both ends of the primary side of the transformer, and when Q1 and Q2 are 'on' at the same time, Both ends of the vehicle generate a voltage approximately '-V'.

3 (a) and 3 (b) show waveforms of the gate input signal and the output voltage of the driving circuit of FIG. 2, respectively. The output voltage generated at the primary side of the transformer is boosted and applied through the first electrode part and the second electrode part.

4 is a view showing a preferred embodiment of the planar structure of the electrode in the flat fluorescent lamp of the present invention, the electrode portion 150 and the second electrode portion 160 to which the power of the opposite polarity is applied to each other )

Specifically, the first electrode unit 150 includes a plurality of strip-shaped first electrodes 151 positioned in parallel to each other in the discharge chamber, and a first lead electrode positioned outside the discharge chamber so that the plurality of first electrodes join. 152.

The second electrode unit 160 includes a plurality of strip-shaped second electrodes 161 positioned in parallel between the first electrodes one by one, and a second lead positioned outside the discharge chamber so that the plurality of second electrodes join. It may be composed of an electrode 162.

Meanwhile, reference numeral 130a of FIG. 4 denotes an area in which the support part 130 is fixed, and end portions of the first electrode and the second electrode extend at least to a portion where the support part 130 is located, and within the discharge chamber. Do not expose the end of the electrode.

This allows the end of the strip-shaped electrode to be located outside the discharge space, so that the end of the strip-shaped electrode does not affect the discharge generated in the discharge chamber, thereby obtaining stable discharge characteristics. In other words, the end portion and the middle portion of the strip-shaped electrode can be prevented from being discharged in different discharge modes to obtain the same luminance uniformity between the center and the edge of the lamp.

As described in the related art, a plurality of needle-like protrusions are formed in the strip-shaped electrode so that the discharge positions are uniformly distributed between the electrodes. This is intended to obtain a uniform brightness uniformity by properly distributing the needle projections so as to start the discharge at the tip of the needle projections to predict the path of discharge and to achieve a uniform discharge between the electrodes.

However, in the conventional electrode structure, the electric field is concentrated on the needle tip or the tip of the electrode, and in particular, the electric field is concentrated on the tip part of the high electric field, thereby making the discharge unstable. In addition, in the electrode structure having a conventional needle protrusion, there is a problem in that a shadow area in which brightness is partially lowered depending on the position of the needle protrusion is inferior to uniformity.

On the other hand, in the electrode structure having a conventional needle projection, the electrode is damaged when the tip is driven in a high electric field for a long time to shorten the life of the product, and there is a problem that the phosphor is degraded and the dielectric layer is damaged. There is a problem that a stable discharge is not made.

However, the electrode structure of the flat fluorescent lamp of the present invention excludes the configuration of the projections in which the discharge is initiated, achieves 1: 1 symmetry on one surface of the discharge tube, and uses a strip-shaped electrode having a straight shape without a separate projection. It was confirmed that the luminance uniformity can be significantly increased as compared with the conventional electrode structure having the needle-shaped projections in which discharge is generated only at a specific position of.

Specifically, Figure 5a is a view showing an example of the uniformity of the brightness of the flat fluorescent lamp according to the present invention, by dividing the entire surface light source into nine equal parts to measure the luminance uniformity. The numbers in parentheses indicate the luminance [cd / m 2] in each measured area.

The total surface light source was divided into nine equal parts, and luminance was measured for each area A1 to A9. The average value of the luminance is 5831 cd / m 2, and according to the definition of the uniformity of the surface light source, the ratio between the highest region A5 and the lowest region A9 is 95%.

FIG. 5B is a view showing luminance uniformity of a conventional flat fluorescent lamp having an electrode structure having a needle protrusion formed thereon for comparison with the luminance uniformity of the flat fluorescent lamp of the present invention. The luminance uniformity was examined by dividing into equal parts.

The total surface light source was divided into nine equal parts, and the luminance was measured for each of the regions B1 to B9. The average luminance value of the conventional fluorescent lamp is 5593 cd / m 2, and according to the definition of the uniformity of the surface light source, the ratio between the highest region B5 and the lowest region B9 is 88%.

That is, when comparing the present invention and the prior art, the luminance uniformity of the conventional fluorescent lamp is 88%, while the luminance uniformity of the fluorescent lamp according to the present invention is 95%, compared to the electrode structure having a conventional needle projection. It can be confirmed that the uniformity is remarkably high.

In the planar fluorescent lamp of the present invention, the thickness of the first electrode and the second electrode is 5 to 15 탆, and the thickness variation of each electrode is preferably made to be 1/2 or less.

This is to prevent the damage of the electrode by the electric field is concentrated on both sides when the thickness difference between the center and both sides of the electrode is so large that both sides are too thin. In consideration of economics, it is possible to optimize the range within which a stable discharge can be made.

Next, in the flat fluorescent lamp of the present invention, the width of each electrode is 0.3 to 1 mm.

Referring to FIG. 6, in the embodiment of the present invention, heat is easily generated when the electrode width is 0.3 mm or less, and when the electrode width increases by 1 mm or more, the peak value of the displacement current increases in proportion to the electrode width, thereby increasing the electrode area. It becomes wider and the capacity of an electrode becomes large. Therefore, even in the case of the discharge current, as the electrode width is wider, the peak value of the current becomes larger, and the retention time of the current is longer, which may cause a problem of generating a lot of reactive power that does not contribute to light emission due to excessive current flow. .

Applicants of the present invention for solving this problem confirmed that it is preferable to determine the electrode width within the 0.3 ~ 1mm range by measuring the discharge efficiency characteristics for the electrode width.

7 is a graph showing the discharge efficiency characteristics according to the electrode width, it can be seen that the efficiency decreases when the electrode width is outside the 0.3 ~ 1mm range.

In the present invention, the technical feature is that the distance between two adjacent electrodes is 1 to 10 mm.

Specifically, the distance between the two electrodes should be considered the pressure in the discharge tube together, and the pressure in the discharge tube must be adjusted according to the distance between the two electrodes in consideration of the law of Pasechen.

)의 함수, Vf = f(d/

)로 나타낼 수 있다.From the law of partition, the discharge start voltage (Vf) is the electrode spacing (d) and the average free stroke (

) Function, Vf = f (d /

)

)은 압력(P)과는 반비례 관계가 있으므로, 파션 법칙으로부터 방전개시 전압(Vf)은 전극 간격(d)이 평균자유행정(

)의 몇 배 인가하는 하나의 변수로서 표현될 수가 있으며, d/

가 같다면 동일한 방전 특성을 보임을 알 수가 있다.Average free administration (

) Is inversely related to the pressure (P), and according to the partition law, the discharge start voltage (Vf) is the average free stroke (

Can be expressed as a variable that is several times

It can be seen that if the same is the same discharge characteristics.

8 is a graph showing discharge start voltage and efficiency characteristics according to electrode spacing in the first embodiment of the present invention. As the electrode spacing increases, the discharge start voltage increases significantly, but the efficiency is increased with the increase rate of the discharge start voltage. Only a small change is shown in comparison.

Next, FIG. 9 is a graph showing the relationship between pressure and luminance according to electrode spacing in the first embodiment of the present invention. As the electrode spacing is narrower, more gas can be filled in many discharge tubes. If the pressure is large, it can be seen that the luminance tends to decrease significantly.

Thus, in the embodiment of the present invention, in order to obtain high luminance with stable discharge characteristics, the distance between two adjacent electrodes is preferably 1 to 10 mm.

In the planar fluorescent lamp of the present invention, a known diffusion sheet may be used to minimize the effect of the difference in brightness between the three discharge electrodes and the luminance discharge region, and at this time, the diffusion sheet and the film for increasing the brightness are regarded as the same role. can do.

In addition, a heat sink may be further provided in the flat fluorescent lamp of the present invention so that heat generation may be easily performed. The heat sink may be mounted on the rear side of the back plate, and the heat sink or silicon may be mounted to effectively conduct heat.

Second Embodiment

In general, since the efficiency of the lamp is proportional to the brightness and inversely proportional to the power consumption, it is necessary to lower the power consumption and increase the brightness in order to increase the efficiency of the lamp.

On the other hand, it is preferable to increase the width of the electrode in order to increase the luminance, but in the case of only one electrode in the form of a strip-like electrode structure as in the first embodiment, the power consumption increases together with the increase in luminance. If only the width of the electrode is increased, it is difficult to expect a great increase in lamp efficiency.

Therefore, the second embodiment of the present invention is characterized by providing a lamp having a high efficiency by setting the width of the electrode to increase the brightness while minimizing the area of the electrode to lower the power consumption.

Specifically, the second embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the planar fluorescent lamp according to the second embodiment of the present invention, the configuration except for the electrode structure is the same as that of the first embodiment, and the following description is omitted in the first embodiment and will be described based on the differences. .

According to the present invention, at least two parallel strip-shaped electrodes of a flat fluorescent lamp form a group and are uniformly disposed on one plane of the discharge tube, and the adjacent strip electrode groups are applied with power of opposite polarity. Having an electrode structure is a technical feature, and in the following description, an electrode structure in which three strip electrodes form a group and have 3: 3 symmetry will be described as a preferable example.

As shown in FIG. 10, in the electrode structure of the flat fluorescent lamp of the present invention, the electrode parts 210 and 220 are provided on the inner surface of the back plate 200 and are made of a conductive material to which power of opposite polarity is applied. The first electrode part 210 and the second electrode part 220 are formed.

The first electrode portion 210 includes a plurality of first electrodes 211 having three strip-shaped electrodes arranged in parallel in the discharge chamber in a group, and the plurality of first electrodes 211 are joined to each other. The first lead electrode 212 is positioned outside the discharge chamber.

The second electrode part 220 includes a plurality of second electrodes 221 having three strip-shaped electrodes arranged in parallel between a group of first electrodes 211 and the plurality of second electrodes. The second lead electrode 222 positioned outside the discharge chamber may be configured to join the two parts 221.

Reference numeral 201 of FIG. 10 denotes a position at which the support part is fixed, and ends of the first electrode and the second electrode extend at least to the portion 201 where the support part is located, so that the end of the electrode is exposed in the discharge chamber. Do not

This is to obtain stable discharge characteristics since the end of the strip-shaped electrode is located outside the discharge space as described in the first embodiment, so that the end of the strip-shaped electrode does not affect the discharge generated in the discharge chamber.

Thus, by configuring the three strip electrodes in a group so that the electrodes of the first electrode portion and the second electrode portion are symmetrical, the impedance value can be lowered and power consumption can be lowered.

In this case, each of the three strip-shaped electrodes may use the same width, but it is also possible to make two electrode widths the same among the three electrodes and increase or decrease the width of the other electrode.

For example, in FIG. 10, the width d2 of the electrodes 211a and 211c on both sides may be wider than the width d1 of the center electrode 211b among the three electrodes in the group.

In the second embodiment of the present invention, as described above in the first embodiment, the width of each electrode is preferably produced in the range of 0.3 to 1 mm.

In addition, referring to FIG. 10, the total width D of the three electrode portions of the 3: 3 electrode is preferably produced in a range of about 1 to 10 mm.

FIG. 11 is a graph showing current waveforms according to the electrode structures of the first and second embodiments of the present invention, and is a current waveform measured under the same voltage condition. Compared with the electrode structure of the first embodiment having a 1: 1 symmetrical structure, the increase in current versus voltage can be confirmed in the electrode structure of the second embodiment having a 3: 3 symmetrical structure.

FIG. 12 is a graph showing luminance characteristics of each electrode structure according to the first and second embodiments of the present invention. In the case of the electrode structure of the first embodiment having a 1: 1 symmetry structure, the displacement current is large and the discharge current is large. Since it is small, it can be seen that the efficiency of the electrode structure of the second embodiment having a 3: 3 symmetrical structure under the same voltage condition is about 25% higher.

That is, as in the second embodiment of the present invention, an electrode structure having a plurality of strip-shaped electrodes as a group brings about an increase in current at the same voltage as compared to one strip-shaped electrode, and changes in material properties, thickness, etc. Without the effect of increasing the brightness. In addition, it is possible to obtain an effect of increasing efficiency by increasing the amount of luminance rather than increasing the power.

On the other hand, Figure 13 and 14 of the present invention is a view showing another embodiment that can be modified in the electrode structure of the present invention.

When comparing the 3: 3 symmetric strip electrode structure described in the second embodiment with the 1: 1 symmetric strip electrode structure described in the first embodiment, the 3: 3 symmetric strip electrode structure is 1: 1 symmetric. It can be understood that the strip-shaped electrode structure has the same electrode shape as the two symmetrical rectangular non-conductive regions are included.

Therefore, the 1: 1 strip type electrode structure includes an arbitrary non-conductive region inside the edge of each strip type electrode structure, thereby reducing the power consumption by lowering the impedance while maintaining the high brightness uniformity characteristics of the 1: 1 strip type electrode. The efficiency of the lamp can be increased. In addition, since the conductance of the electrode can be expected to be reduced, there is an advantage that the displacement current can be reduced and the discharge current can be increased even at the same distance between electrodes.

As such, the non-conductive region formed inside the edge of each strip-shaped electrode may have various shapes. For example, as illustrated in FIG. 13, two or more non-conductive regions (FIG. 13) may be formed inside two edges of each strip-shaped electrode, or as shown in FIG. Regions can be formed.

In the flat fluorescent lamp of the present invention as described above, the strip-shaped electrodes are disposed in the discharge tube so that the strip-shaped electrodes are symmetrically 1: 1 or two or more strip-shaped electrodes are symmetrically formed in a group, and thus in the needle projection of the conventional electrode structure. It is an invention that has the effect of minimizing the thickness of the fluorescent lamp panel by eliminating the luminance difference due to the partial discharge, having a stable discharge and uniform luminance distribution.

Claims (12)

A flat plate-shaped discharge tube filled with gas and having a predetermined thickness, a conductive electrode portion printed in the discharge tube, a dielectric layer applied to the electrode portion and the discharge tube, and a phosphor applied to the dielectric layer. In fluorescent lamps, The electrode part is composed of a plurality of strip-shaped electrodes arranged in parallel and uniformly on one plane inside the discharge tube, the power supply of the opposite polarity is applied to the strip electrodes adjacent to each other at the time of discharge Electrode structure of fluorescent lamp. A flat plate including a flat discharge tube having a predetermined thickness filled with a gas, a conductive electrode portion printed in the discharge tube, a dielectric layer applied to the electrode portion and the discharge tube, and a phosphor applied to a portion of the dielectric layer. In the fluorescent lamp of the type, The electrode part is composed of a plurality of strip electrodes arranged uniformly on one plane inside the discharge tube while forming at least two parallel strips in a parallel discharge tube, wherein the adjacent strip electrode groups have opposite polarities. An electrode structure of a flat fluorescent lamp, characterized in that the power is applied. A flat plate-shaped discharge tube filled with gas and having a predetermined thickness, a conductive electrode portion printed in the discharge tube, a dielectric layer applied to the electrode portion and the discharge tube, and a phosphor applied to the dielectric layer. In the fluorescent lamp of, The electrode part is composed of a plurality of strip-shaped electrodes arranged parallel and uniformly on one plane inside the discharge tube, wherein the strip-shaped electrode has a non-conductive area formed inside the edge, and the adjacent strips at the time of discharge An electrode structure of a flat fluorescent lamp, characterized in that the electrodes are applied with power of opposite polarity. According to claim 1, 2, or 3, wherein the discharge tube is made of a flat plate-shaped front plate and the electrode back plate is printed, the front plate and the back plate is bonded by frit glass An electrode structure of a flat fluorescent lamp, characterized by airtightness. In a flat fluorescent lamp filled with gas, A front plate coated with a phosphor; A back plate provided with a reflecting plate, first and second electrode portions having conductivity printed so as to be electrically insulated from each other, a dielectric layer, and a phosphor; It is composed of a support for maintaining the airtight so that the discharge chamber is formed by supporting between the front plate and the back plate, The first electrode part includes a plurality of strip-shaped first electrodes positioned in parallel to each other in the discharge chamber, and a first lead electrode positioned outside the discharge chamber so that the plurality of first electrodes join. The second electrode part includes a plurality of strip-shaped second electrodes disposed in parallel between the first electrodes one by one, and a second lead electrode positioned outside the discharge chamber so that the plurality of second electrodes join. Flat fluorescent lamps. 6. The flat fluorescent lamp of claim 5, wherein the first and second electrodes have a thickness of 5 to 15 µm. 7. The flat fluorescent lamp of claim 5 or 6, wherein the thickness variation of the first and second electrodes is 1/2 or less. 6. The flat fluorescent lamp of claim 5, wherein a distance from the first electrode to the second electrode closest to the first electrode is 1 to 10 mm. In a flat fluorescent lamp filled with gas, A front plate coated with a phosphor; A back plate provided with a reflecting plate, first and second electrode portions having conductivity printed so as to be electrically insulated from each other, a dielectric layer, and a phosphor; It is composed of a support for maintaining the airtight so that the discharge chamber is formed by supporting between the front plate and the back plate, The first electrode part includes a plurality of strip-shaped first electrodes arranged in parallel in a group with at least two side by side strips in the discharge chamber, and a first outside the discharge chamber so that the plurality of first electrodes are joined. It consists of a lead electrode, The second electrode part includes a plurality of strip-shaped second electrodes in which a corresponding number of strips are arranged in parallel in a group so as to be symmetrical between a group of the strip-shaped first electrodes, and the plurality of second electrodes. A flat fluorescent lamp comprising a second lead electrode positioned outside the discharge chamber to join the electrodes. 10. The flat fluorescent lamp of claim 9, wherein the first and second electrodes comprise three strips. The flat fluorescent lamp of claim 5 or 9, wherein the first and second electrodes have a width of 0.3 mm to 1 mm. 10. The flat fluorescent lamp of claim 9, wherein an electrode width of the group consisting of the three strips is 1 to 10 mm.

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