KR100626047B1 - Flat type lamp - Google Patents

Abstract

Disclosed is a flat lamp. The present invention provides a semiconductor device comprising: a first substrate; first and second discharge electrodes disposed to face the inner surface of the first substrate; a first dielectric layer filling the first and second discharge electrodes; and a first substrate. A second substrate disposed so as to face each other, a third and fourth discharge electrodes disposed to face the inner surface of the second substrate, a second dielectric layer filling the third and fourth discharge electrodes, and a first and a second substrate. A phosphor layer applied in a discharge space formed between the substrates, wherein the first to fourth discharge electrodes are alternately disposed, and four discharge electrodes are provided in one discharge space so that opposite discharge and surface discharge are generated at the same time. As a result, the probability of plasma generation is relatively increased, thereby improving the luminous efficiency of the lamp.

Description

Flat lamp {Flat type lamp}

1 is a cross-sectional view showing a backlight according to a conventional example,

2 is a plan view showing a flat lamp according to another conventional example,

3 is an exploded perspective view showing a part of the flat lamp according to the first embodiment of the present invention;

4A is a configuration diagram showing a structure in which a discharge electrode group of the first substrate of FIG. 3 is disposed;

4B is a configuration diagram showing a structure in which a discharge electrode group of the second substrate of FIG. 3 is disposed;

5 is a cross-sectional view illustrating a state in which the flat lamp of FIG. 3 is discharged;

6 is a cross-sectional view showing a flat lamp according to a second embodiment of the present invention;

7 is a cross-sectional view showing a flat lamp according to a third embodiment of the present invention.

<Brief description of symbols for the main parts of the drawings>

300 ... flat lamp 310 ... front panel

311 ... First substrate 312 ... First discharge electrode

316 ... second discharge electrode 320 ... first phosphor layer

360 ... back panel 361 ... second substrate

362 ... third discharge electrode 366 ... fourth discharge electrode

370 ... second phosphor layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat lamp, and more particularly, to a flat lamp having a plurality of discharge electrodes provided on a plurality of substrates and injecting a discharge gas excluding mercury to improve luminous efficiency.

In general, flat display devices are classified into light emitting type and light receiving type. The light emitting flat panel display includes a plasma display panel, an electro luminescent device, a flat cathode ray tube, a fluorescent display, and the like. The light receiving type flat panel display includes a liquid crystal display and the like.

Among them, since the liquid crystal display itself emits light and does not form an image, and light is incident on the outside to form an image, there is a disadvantage that the image cannot be observed in a dark place.

In order to solve this problem, a back light is installed at the rear of the liquid crystal display to irradiate light toward the panel. As a result, the image can be observed even in a dark place. In addition to light receiving type flat panel display devices such as liquid crystal displays, the backlight is used in surface light source devices such as lighting signs.

The backlight is a direct light type in which a plurality of light sources disposed below the liquid crystal panel directly irradiate light to the liquid crystal panel, and a light source installed on the sidewall of the light guide, depending on the form of the light source. The light may be classified into an edge light type that emits light to the liquid crystal panel. In addition, a fluorescent lamp, which is one of the light sources of the backlight, has a cold cathode fluorescent lamp (CCFL) in which electrodes at both ends are installed in the tube and an electrode at both ends of the tube according to the shape of the electrode. And an external electrode fluorescent lamp (hereinafter, referred to as EEFL).

Among them, the direct-emitting backlight is intended to make the brightness uniform by mounting the CCFL on the lower part of the liquid crystal panel and installing a reflector plate and a diffuser plate at the lower part thereof. Luminance is not essentially guaranteed.

In order to improve this problem, Korean Patent Publication No. 2000-319 discloses a structure for generating light by forming electrodes on both sides, and Korean Patent Publication No. 2000-58697 discloses the basics of backlight driving. Doing.

1 illustrates an edge emitting backlight disclosed in Korean Patent Application No. 01-9476.

Referring to the drawings, a conventional backlight includes a light guide plate 101 having a plurality of light guide pattern portions 103 formed on a lower surface thereof by a laser beam, a reflective plate 102 provided on a bottom surface of the light guide plate 101, and At least one light emitting means 105 is provided on the side of the light guide plate 101. In addition, a light diffusion part 104 formed with fine scratches on a laser beam is formed on an upper surface of the light guide pattern 103 of the light guide plate 101.

As such, the edge-emitting backlight has a light guide plate, a light diffusion plate, a prism plate, and the like to send uniform light to the liquid crystal panel, and the light of the light source is transmitted to the light guide plate, and the transmitted light is uniform through the light diffusion plate. Diffuses, collects the light passed by the prism plate at the reagent angle of the liquid crystal panel, and improves the brightness. However, such a structure is very complicated in construction and not only increases manufacturing costs, but also has low efficiency for power consumption due to reflection and transmission of light, and it is difficult to guarantee uniformity of luminance.

In recent years, as the flat panel display device becomes larger, it is necessary to compensate for the disadvantage of lowering the brightness of the backlight, to reduce the brightness distribution between the lamps of the direct-emitting backlight using EEFL, to improve the low brightness of the edge-emitting backlight, and to eliminate unnecessary assembly. In order to eliminate the work, to realize a large screen of high brightness as the thickness of the thin film, and to improve the disadvantages of replacing any one of the lamps at the end of their lifetime, as in the case of direct-emitting backlight using EEFL Flat lamps are under research and development.

2 illustrates a flat lamp 200 disclosed in Korean Patent Application No. 02-47202.

Referring to the drawings, the flat lamp 200 includes a front substrate 201 and a rear substrate 202 disposed opposite thereto. A partition wall 208 is formed on the top surface of the rear substrate 202 at predetermined intervals, and the partition wall 208 is a strip-shaped first partition wall 206 extending from one side of the rear substrate 202 to the other side. And a strip-shaped second partition wall 207 extending from the other side of the back substrate 202 to one side thereof.

The outermost portion of the barrier rib 208 is formed with a sealant 203 for vacuum sealing the edges of the front and rear substrates 201 and 202. The phosphor layer 209 is coated in the discharge space between the first and second partitions 206 and 207. In the discharge space in which the phosphor layer 209 is formed, a metal plate 210 impregnated with mercury is provided.

On the other hand, on the outer surfaces of the sealed front and back substrates 201 and 202, a strip-shaped first electrode 204 and a second electrode 205 are disposed in a direction orthogonal to the partition wall 208. The first and second electrodes 204 and 205 are disposed to face each other.

Conventional flat lamps use rare earth metals in phosphor layers for high efficiency light emission, and discharge gases are used alone or in combination with mercury, such as argon, neon and krypton. This is the principle that the phosphor layer emits light using ultraviolet rays of 254 nanometers generated from the excited mercury.

However, according to the recent European Union's major environmental regulations, the Reduction of Hazardous Substances (ROHS) guideline for hazardous substances in electrical and electronic products, which is scheduled to enter into force in 2006, has been introduced to hazardous substances such as lead and mercury. Prohibition of the sale of electric and electronic products, including.

Therefore, in order to replace the high luminous efficiency of mercury, which was mainly used as the discharge gas, research is being conducted on a structure having an equivalent luminous efficiency without mercury.

The present invention is to solve the above problems, by injecting a discharge gas excluding mercury between a plurality of substrates, by providing a plurality of discharge electrodes on the opposite surface of the substrate to generate a surface discharge and a counter discharge at the same time, It is an object of the present invention to provide a flat lamp having improved luminous efficiency.

Flat lamp according to an aspect of the present invention for achieving the above object,

A first substrate;

A first discharge electrode provided on an inner surface of the first substrate and a second discharge electrode disposed to face the first discharge electrode;

A first dielectric layer filling the first and second discharge electrodes;

A second substrate disposed to face the first substrate;

A third discharge electrode provided on an inner surface of the second substrate and a fourth discharge electrode disposed to face the third discharge electrode;

A second dielectric layer filling the third and fourth discharge electrodes; And

And a phosphor layer applied in a discharge space formed between the first and second substrates.

The first discharge electrode may include a strip-shaped first discharge electrode line disposed along one edge of the first substrate, and a plurality of first protrusions protruding a predetermined length from the first discharge electrode line toward the second discharge electrode. With 1 rib,

The second discharge electrode includes a second discharge electrode line disposed along the other edge of the first substrate, and a plurality of second ribs protruding a predetermined length from the second discharge electrode line toward the first discharge electrode. It is characterized by.

In addition, the plurality of first and second ribs protrude from the first and second discharge electrode lines at a predetermined interval, respectively, and are disposed to be staggered with each other.

The third discharge electrode may further include a third discharge electrode line disposed along one edge of the second substrate, and a plurality of third ribs protruding from the third discharge electrode line toward the fourth discharge electrode. ,

The fourth discharge electrode includes a fourth discharge electrode line disposed along the other edge of the second substrate, and a plurality of fourth ribs protruding from the fourth discharge electrode line toward the third discharge electrode. It is done.

In addition, the third and fourth ribs may protrude from the third and fourth discharge electrode lines at a predetermined interval, and are alternately disposed.

Furthermore, the first discharge electrode and the third discharge electrode are disposed opposite to each other, and the second discharge electrode and the fourth discharge electrode are disposed opposite to each other.

In addition, the first and fourth discharge electrodes are applied with voltages of the same polarity, and the second and third discharge electrodes are applied with voltages of the same polarity, and the first and fourth discharge electrodes and the second And the third discharge electrode is characterized in that the voltage of different polarity is applied.

In addition, the first to fourth discharge electrodes are characterized by a structure in which both surface discharge and counter discharge occur.

In addition, a pulse wave is applied to the first to fourth discharge electrodes.

In addition, RF waves are applied to the first to fourth discharge electrodes.

In particular, the discharge space is characterized in that the discharge gas made of at least one mixed gas selected from xenon, neon, helium is excluded mercury is injected.

Flat lamp according to another aspect of the present invention,

A first substrate;

A second substrate disposed to face the first substrate;

A plurality of discharge voltages applied to the first and fourth discharge electrodes having the same polarity and the second and the third discharge electrodes having different polarities and disposed in discharge spaces formed between the first and second substrates; Discharge electrode groups; And

And a phosphor layer coated in the discharge space.

The first discharge electrode and the second discharge electrode may be disposed along opposite sides on the first substrate, and the third discharge electrode and the fourth discharge electrode may be disposed along opposite sides on the second substrate. It features.

Further, the first and second discharge electrodes are arranged in a direction facing away from the first and second discharge electrode lines of the strip shape disposed along opposite sides of the first substrate and the first and second discharge electrode lines. A plurality of first and second ribs alternately spaced apart by a predetermined interval;

The third and fourth discharge electrodes may have a strip-shaped third and fourth discharge electrode lines arranged along opposite sides of the second substrate, and predetermined distances in the opposite directions from the third and fourth discharge electrode lines. And a plurality of third and fourth ribs spaced apart from each other.

In addition, the first and third discharge electrodes are disposed opposite to each other, the second and fourth discharge electrodes are disposed opposite to each other, and a quadrupole-shaped discharge space between the first to fourth discharge electrodes. Characterized in that formed.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the flat lamp according to the present invention.

3 shows a flat lamp 300 according to a first embodiment of the present invention.

Referring to the drawings, the flat lamp 300 includes a first panel 310 and a second panel 360 disposed to face the first panel 310.

The first panel 311 is provided on the first panel 310. The first substrate 311 is made of a transparent material such as soda lime glass. A plurality of first discharge electrodes 312 and a plurality of second discharge electrodes 316 are formed on the bottom surface of the first substrate 311.

The first discharge electrode 312 is buried by the first dielectric layer 313, and the second discharge electrode 316 is buried by the second dielectric layer 317. In addition, a first passivation layer 314 such as magnesium oxide (MgO) is deposited on the surface of the first dielectric layer 313, and a second passivation layer 318 is deposited on the surface of the second dielectric layer 317. It is.

Accordingly, the first dielectric layer 313 and the first passivation layer 314 are continuously formed on the outer surface of the first discharge electrode 312, and the second dielectric layer () is formed on the outer surface of the second discharge electrode 316. 317 and the second protective film layer 318 are formed in succession.

In addition, a first phosphor layer 320 made of a material that emits white light at the time of discharge is coated on the inner surface of the first substrate 311. The first phosphor layer 320 is formed in a region other than a portion where the first and second discharge electrodes 312 and 316 are formed.

A second substrate 361 is provided on the second panel 360, and the second substrate 361 is made of substantially the same material as the first substrate 311. A plurality of third discharge electrodes 362 and a plurality of fourth discharge electrodes 366 are formed on the upper surface of the second substrate 361.

The third discharge electrode 362 is buried by a third dielectric layer 363, and the fourth discharge electrode 366 is buried by a fourth dielectric layer 367. In addition, a third passivation layer 364 is deposited on the surface of the third dielectric layer 363, and a fourth passivation layer 368 is deposited on the surface of the fourth dielectric layer 367.

As such, the third dielectric layer 363 and the third passivation layer 364 are continuously formed on the outer surface of the third discharge electrode 362, and the third dielectric layer 367 is formed on the outer surface of the fourth discharge electrode 366. ) And the third protective film layer 364 are formed in succession.

On the other hand, the second phosphor layer 370 emitting white light is coated on the inner surface of the second substrate 361. The second phosphor layer 370 is formed in a region other than a portion where the third and fourth discharge electrodes 362 and 366 are formed.

In this case, the first discharge electrode 312 disposed on the first substrate 311 is disposed to face the third discharge electrode 362 disposed on the second substrate 361 and the first substrate 311. The second discharge electrode 316 disposed on the N-axis is disposed to face the fourth discharge electrode 364 disposed on the second substrate 361.

In addition, the first to fourth discharge electrodes 312 or 316 (362 or 366) can be designed in a variety of cross-sectional shapes, in the present embodiment forms a shape in which a circular cross section is integrally combined on a square cross section. have.

FIG. 4A illustrates a state in which the first and second discharge electrodes 312 and 316 of FIG. 3 are disposed.

Referring to FIG. 4A, the first discharge electrode 312 includes first discharge electrode lines 312a disposed along one edge of the first substrate 311. The first discharge electrode line 312a is disposed in a strip shape along one direction of the first substrate 311.

A first rib 312b is connected to the first discharge electrode line 312a toward the second discharge electrode 316. The first rib 312b protrudes a predetermined length from an inner wall of the first discharge electrode line 312a, and the protruding length extends close to the other edge of the first substrate 311. In addition, a plurality of the first ribs 312b are disposed to be spaced apart from each other by a predetermined interval along the length direction of the first discharge electrode line 312a.

The second discharge electrode 316 has a second discharge electrode line 316a disposed along the other edge of the first substrate 311. The second discharge electrode line 316a has a strip shape disposed along the length of the long side portion of the first substrate 311.

A second rib 316b extending from the second discharge electrode line 316a toward the first discharge electrode 312 is connected thereto. The second rib 316b integrally extends from an inner side wall of the second discharge electrode line 316a and protrudes to a position proximate to one edge of the first substrate 311. The plurality of second ribs 316b are disposed to be spaced apart from each other by a predetermined interval along the length direction of the second discharge electrode line 316a.

In this case, the first rib 312b and the second rib 316b are alternately arranged with each other, and are repeatedly alternated along the long side of the first substrate 311. Accordingly, the first discharge electrode 312 and the second discharge electrode 316 are arranged in a comb shape from opposite sides of the first substrate 311.

FIG. 4B illustrates a state in which the third and fourth discharge electrodes 362 and 366 of FIG. 3 are disposed.

Referring to the drawings, the third discharge electrode 362 includes a third discharge electrode line 362a disposed along one edge of the second substrate 361. The third discharge electrode line 362a has a strip shape in a long side direction of the second substrate 361 at a position corresponding to the first discharge electrode line 312a of the first substrate 311.

A third rib 362b protruding toward the fourth discharge electrode 366 is connected to the third discharge electrode line 362a. The third rib 362b protrudes integrally from the inside of the third discharge electrode line 362a and extends to a position close to the other edge of the second substrate 361. The third rib 362b is also disposed at a position corresponding to the first rib 312b of the first substrate 311, and a plurality of third ribs 362b are formed to be spaced apart by a predetermined interval along the long side direction of the second substrate 361. have.

The fourth discharge electrode 366 includes a fourth discharge electrode line 366a disposed along the other edge of the second substrate 361. The fourth discharge electrode line 366a has a strip shape disposed along the long side direction of the second substrate 361. The fourth discharge electrode line 366a is disposed at a position corresponding to the second discharge electrode line 316a of the first substrate 311.

The fourth discharge electrode line 366a is provided with a plurality of fourth ribs 366b which are integrally connected to the fourth discharge electrode line 366a and protrude toward the third discharge electrode 362. The fourth ribs 366b are disposed at positions corresponding to the second ribs 316b of the first substrate 311, and a plurality of fourth ribs 366b are formed to be spaced apart by a predetermined interval along the long side direction of the second substrate 361.

As such, the third rib 362b and the fourth rib 366b are alternately disposed along the long side of the second substrate 361, such that the third discharge electrode 361 and the fourth discharge electrode ( 366 is disposed in a comb shape from opposite sides of the second substrate 361.

Here, voltages having the same polarity are applied to the first and fourth discharge electrodes 313 and 366, and voltages having the same polarity are applied to the second and third discharge electrodes 316 and 362. In addition, voltages of different polarities are applied to the first and fourth discharge electrodes 313 and 366 and the second and third discharge electrodes 316 and 362, respectively.

Meanwhile, at least one selected from xenon (Xe), neon (Ne), and helium (He) in which mercury is excluded in the discharge space in which the first and second substrates 311 and 361 are sealed by a sealant. The above mixed gas is injected.

Looking at the operation of the flat lamp 300 having the configuration as described above is as shown in FIG.

First, the first and fourth discharge electrodes 312 and 366 and the second and third discharge electrodes 316 and 362 have a predetermined voltage, for example, an AC or pulse waveform voltage or a radio frequency. A sine wave of frequency, hereinafter, RF) is applied. At this time, the applied pulse wave is about 10 to 40 kHz.

The same waveform voltage is applied to the first and fourth discharge electrodes 312 and 366, and the same waveform voltage is applied to the second and third discharge electrodes 316 and 362. That is, a relatively high voltage “+” is applied to the first and fourth discharge electrodes 312 and 366, and a relatively low voltage is applied to the second and third discharge electrodes 316 and 362. As the voltage "-" is applied, an electric field is formed in the discharge space.

When sufficient voltage is applied between the first and fourth discharge electrodes 312 and 366 and the second and third discharge electrodes 316 and 362 to generate a discharge, surface discharge and counter discharge start simultaneously. do. Thereafter, the discharge voltage between the first and fourth discharge electrodes 312 and 366 and the second and third discharge electrodes 316 and 362 is gradually lowered, while the discharge is farther away between the electrodes. Will spread.

If the voltage difference between the first and fourth discharge electrodes 312 and 366 and the second and third discharge electrodes 316 and 362 is lower than the discharge voltage, the discharge no longer occurs, and space Charges and wall charges are formed in the discharge space.

Thereafter, when the polarities of the first and fourth discharge electrodes 312 and 366 and the second and third discharge electrodes 316 and 362 are switched, discharge is generated again. The discharge is stably generated while repeating this process.

As such, when voltage is alternately applied to the first and fourth discharge electrodes 312 and 366 and the second and third discharge electrodes 316 and 362, the first and fourth discharge electrodes 312 may be used. 366 and the wall charge charged on the corresponding surfaces of the second and third discharge electrodes 316 and 362 move with the voltage difference, and discharge between the first and second substrates 311 and 361. It collides with the discharge gas in the space to produce a plasma, which discharge starts between the first and fourth discharge electrodes 312 and 366 and between the second and third discharge electrodes 316 and 362. It expands to the whole discharge space.

The ultraviolet rays generated by the discharge excite the fluorescent material of the first phosphor layer 320 and the second phosphor layer 370 applied to the discharge space. Through this process, visible light is obtained. The generated visible light is emitted to the discharge space.

On the other hand, when the first and fourth discharge electrodes 312 and 366 and the second and third discharge electrodes 316 and 362 apply voltages to each other, two “+” and two “ One discharge space is formed by the quadrupole-shaped discharge electrodes.

In this one discharge space, the electric field associated with the four discharges is configured, thereby increasing the probability of generating plasma in the discharge space, thereby increasing the brightness of the light.

In addition, when a pulse voltage or a square wave of RF is applied to the first and fourth discharge electrodes 312 and 366 and the second and third discharge electrodes 316 and 362, the center of the discharge space is near. In this case, the force that the plasma radiates to the outside part is eliminated, and rather, the phenomenon of focusing into the space occurs. In this manner, the loss of plasma can be reduced due to the quadrupole discharge electrode, and the luminous efficiency can be improved.

5 shows a flat lamp according to a second embodiment of the present invention.

Hereinafter, in the following embodiment, since the operation of the flat lamp is the same as the first embodiment described above, it will be limited to the structure of the flat lamp.

Referring to the drawings, the flat lamp is provided with a first substrate 611 and a second substrate 661 disposed to face the same.

A first electrode 612 is disposed on a lower surface of the first substrate 611, and a first dielectric layer 613 and a first passivation layer 614 are continuously formed on an outer surface of the first electrode 612. have. A second electrode 616 is disposed adjacent to the first electrode 612, and a second dielectric layer 617 and a second passivation layer 618 are continuously formed on an outer surface of the second electrode 616. It is. The first and second electrodes 612 and 616 have a comb shape that is alternately disposed along opposite sides of the first substrate 611.

A third electrode 662 is disposed on an upper surface of the second substrate 661, and a third dielectric layer 663 and a third passivation layer 664 are continuously formed on an outer surface of the third electrode 662. have. The third electrode 662 is disposed at a position corresponding to the first electrode 612 of the first substrate 611. A fourth electrode 666 is disposed adjacent to the third electrode 662, and a fourth dielectric layer 667 and a fourth passivation layer 668 are continuously formed on an outer surface of the fourth electrode 666. It is. The fourth electrode 666 is disposed at a position corresponding to the second electrode 616 of the first substrate 611. The third and fourth electrodes 662 and 666 have a comb shape that is alternately disposed along opposite sides of the second substrate 661.

In this case, voltages having the same polarity are applied to the first and fourth discharge electrodes 612 and 666, and voltages having the same polarity are applied to the second and third discharge electrodes 616 and 662. In addition, voltages of different polarities are applied to the first and fourth discharge electrodes 612 and 666 and the second and third discharge electrodes 616 and 662, respectively.

In addition, the first and fourth discharge electrodes 612 and 666 and the second and third discharge electrodes 616 and 662 are rectangular in cross section. Thus, even if the first and fourth discharge electrodes 612 and 666 and the second and third discharge electrodes 616 and 662 are thinly formed on the front and rear substrates 611 and 661, By applying a sinusoidal wave of RF, it is possible to reduce the loss of plasma in the discharge space and to obtain high luminous efficiency.

On the other hand, a first phosphor layer 620 is coated on the inner surface of the first substrate 611 except for the regions where the first and second discharge electrodes 612 and 666 are formed, and the third and fourth discharges are applied. The second phosphor layer 670 is applied to the inner surface of the second substrate 661 other than the region where the electrodes 662 and 666 are formed.

7 shows a flat lamp according to a third embodiment of the present invention.

Referring to the drawings, a flat lamp is provided with a first substrate 711 and a second substrate 761 disposed in parallel therewith.

The first discharge electrode 712 and the second discharge electrode 716 having a comb shape are alternately disposed on the lower surface of the first substrate 711. A first dielectric layer 713 and a first passivation layer 714 are coated on an outer surface of the first discharge electrode 712, and a second dielectric layer 717 and an outer surface of the second discharge electrode 716. The second protective film layer 718 is applied.

In this case, a first phosphor layer 720 emitting white light is preferentially applied to an inner surface of the first substrate 711, and the first and second discharge electrodes 712 and 716 are formed of the first phosphor. It is formed from the surface of layer 720.

A comb shape is formed on an upper surface of the second substrate 761, and a third discharge electrode 762 is disposed at a position corresponding to the first discharge electrode 712, and is at a position corresponding to the second discharge electrode 716. The fourth discharge electrode 766 is disposed. A third dielectric layer 763 and a third passivation layer 764 are coated on an outer surface of the third discharge electrode 762, and a fourth dielectric layer 767 and an outer surface of the fourth discharge electrode 766. The fourth protective film layer 768 is applied.

At this time, the second phosphor layer 770 is preferentially applied to the inner surface of the second substrate 761, and the third and fourth discharge electrodes 762 are applied to the inner surface of the second substrate 761. 766 is formed from the surface of the second phosphor layer 770.

Meanwhile, cross-sectional phenomenon of the first and second discharge electrodes 712 and 716 and the third and fourth discharge electrodes 762 and 766 may have a first rectangular shape on the surface of the second phosphor layer 770. It is formed of, and consists of a second rectangular shape on the upper portion of the first rectangular shape and integrally wider than this.

As described above, the flat lamp of the present invention can obtain the following effects.

First, since the discharge electrodes are alternately arranged on the inner surfaces of the plurality of substrates, and the four discharge electrodes are disposed in one discharge space at the same time, the opposite discharge and the surface discharge are generated at the same time, thereby increasing the probability of generating plasma relatively. This improves the luminous efficiency of the lamp used as the backlight of the liquid crystal display.                     

Second, by applying a pulse voltage of a specific frequency or a square wave of RF to concentrate the plasma into the discharge space, the plasma loss can be reduced to improve the luminous efficiency of the lamp.

Third, even if the mercury is excluded and used as a discharge gas using a mixed gas such as xenon, neon, and helium, high luminous efficiency can be obtained and it is environmentally friendly.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (22)

A first substrate; A first discharge electrode provided on an inner surface of the first substrate and a second discharge electrode disposed to face the first discharge electrode; A first dielectric layer filling the first and second discharge electrodes; A second substrate disposed to face the first substrate; A third discharge electrode provided on an inner surface of the second substrate and a fourth discharge electrode disposed to face the third discharge electrode; A second dielectric layer filling the third and fourth discharge electrodes; And And a phosphor layer applied in a discharge space formed between the first and second substrates. The method of claim 1, The first discharge electrode may include a strip-shaped first discharge electrode line disposed along one edge of the first substrate, and a plurality of first ribs protruding a predetermined length from the first discharge electrode line toward the second discharge electrode. And The second discharge electrode includes a second discharge electrode line disposed along the other edge of the first substrate, and a plurality of second ribs protruding a predetermined length from the second discharge electrode line toward the first discharge electrode. Flat lamp characterized in that. The method of claim 2, And a plurality of the first and second ribs protrude from the first and second discharge electrode lines at predetermined intervals, and are alternately arranged with each other. The method of claim 2, And the first discharge electrode and the second discharge electrode are arranged in a comb shape from opposite sides of the substrate. The method of claim 1, The third discharge electrode includes a third discharge electrode line disposed along one edge of the second substrate, and a plurality of third ribs protruding from the third discharge electrode line toward the fourth discharge electrode, The fourth discharge electrode includes a fourth discharge electrode line disposed along the other edge of the second substrate, and a plurality of fourth ribs protruding from the fourth discharge electrode line toward the third discharge electrode. Flat lamp. The method of claim 5 And a plurality of the third and fourth ribs protrude from the third and fourth discharge electrode lines at predetermined intervals and are alternately disposed. The method of claim 5, And the third discharge electrode and the fourth discharge electrode are arranged in a comb shape from opposite sides of the substrate. The method according to any one of claims 2 to 7, And the first discharge electrode and the third discharge electrode are disposed opposite to each other, and the second discharge electrode and the fourth discharge electrode are disposed opposite to each other. The method of claim 8, Voltages of the same polarity are applied to the first and fourth discharge electrodes, and voltages of the same polarity are applied to the second and third discharge electrodes, and the first and fourth discharge electrodes and the second and the third discharge electrodes are applied to the first and fourth discharge electrodes. The flat discharge lamp, characterized in that the three discharge electrodes are applied with a voltage of different polarity. The method according to any one of claims 2 to 7, And the first to fourth discharge electrodes have a structure in which both surface discharge and counter discharge are generated. The method according to any one of claims 2 to 7, The flat lamp of claim 1, wherein a pulse wave is applied to the first to fourth discharge electrodes. The method according to any one of claims 2 to 7, A flat lamp of claim 1, wherein a square wave of RF is applied to the first to fourth discharge electrodes. The method of claim 1, And a discharge gas including at least one mixed gas selected from xenon, neon, and helium in which mercury is removed is injected into the discharge space. The method of claim 1, And the phosphor layer is formed on an inner surface of at least one of the front substrate and the rear substrate. The method of claim 1, The phosphor layer is a flat lamp, characterized in that the phosphor layer emitting white light. A first substrate; A second substrate disposed to face the first substrate; A plurality of discharge voltages applied to the first and fourth discharge electrodes having the same polarity and the second and the third discharge electrodes having different polarities and disposed in discharge spaces formed between the first and second substrates; Discharge electrode groups; And And a phosphor layer coated in the discharge space. The method of claim 16, Wherein the first discharge electrode and the second discharge electrode are disposed along opposite sides on the first substrate, and the third discharge electrode and the fourth discharge electrode are disposed along opposite sides on the second substrate. Flat lamp. The method of claim 17, The first and second discharge electrodes may be spaced apart from each other by the first and second discharge electrode lines having a strip shape disposed along opposite sides of the first substrate, and in a direction opposite to the first and second discharge electrode lines. A plurality of first and second ribs spaced apart and spaced apart, The third and fourth discharge electrodes may have a strip-shaped third and fourth discharge electrode lines arranged along opposite sides of the second substrate, and predetermined distances in the opposite directions from the third and fourth discharge electrode lines. A flat lamp comprising a plurality of third and fourth ribs spaced apart from each other. The method of claim 18, The first and third discharge electrodes are disposed to face each other, the second and fourth discharge electrodes are disposed to face each other, and a quadrupole-shaped discharge space is formed between the first to fourth discharge electrodes. Flat lamp characterized in that. The method of claim 16, And a pulse wave is applied to the discharge electrode group. The method of claim 16, A flat plate lamp, characterized in that a square wave of RF is applied to the discharge electrode group. The method of claim 16, And a discharge gas including at least one mixed gas selected from xenon, neon, and helium in which mercury is removed is injected into the discharge space.

Images