KR100766920B1 - A flat fluorescent lamp - Google Patents

Abstract

The present invention relates to a surface light source device having a high discharge efficiency. To this end, the surface light source device according to the present invention includes a lower substrate, an upper substrate covering the lower substrate to form a discharge region together with the lower substrate, and a plurality of first partition walls defining a discharge region to form a plurality of discharge units. Both ends of the plurality of second partition walls and the discharge unit, which are disposed between at least one of an edge portion of the upper substrate parallel to the partition wall, between the first partition wall, and between the first partition walls, and one end side thereof is alternately alternately opened. And phosphor layers formed on inner surfaces of the lower and upper substrates, the first and second electrodes respectively disposed in the discharge chamber. Through such a surface light source device, the brightness can be improved while increasing the discharge efficiency.

Surface light source device, electrode, partition wall, dielectric layer

Description

Surface light source device {A FLAT FLUORESCENT LAMP}

1 is an exploded perspective view of a surface light source device according to a first embodiment of the present invention.

2 is a combined perspective view of the surface light source device according to the first embodiment of the present invention.

3 is a plan view of a surface light source device according to a first embodiment of the present invention.

(A) and (B) of FIG. 4 are partial sectional views of the AA line and the BB line of FIG. 2, respectively.

5 is a partial cross-sectional view of the surface light source device according to the second embodiment of the present invention.

6 is a partial cross-sectional view of the surface light source device according to the third embodiment of the present invention.

7 is a plan view of a surface light source device according to a fourth embodiment of the present invention.

8 is an exploded perspective view of a surface light source device according to a fifth embodiment of the present invention.

The present invention relates to a surface light source device, and more particularly to a surface light source device having a high discharge efficiency.

With the recent development of semiconductor technology, which is rapidly developing in recent years, the demand for flat panel display devices that are smaller and lighter and has improved performance is exploding.

The liquid crystal display (LCD), which has recently been in the spotlight among the flat panel display devices, has advantages such as miniaturization, light weight, and low power consumption, thereby overcoming the disadvantages of the conventional cathode ray tube (CRT). As an alternative means, it has been gradually attracting attention, and is currently used in almost all information processing equipment that requires a display device.

A general liquid crystal display device applies voltage to a specific molecular array of a liquid crystal to convert it into another molecular array, and visually changes optical properties such as birefringence, photoreactivity, dichroism, and light scattering characteristics of the liquid crystal cell emitted by the molecular array. It is a display apparatus which displays information using the modulation of the light by a liquid crystal cell as converting into a change.

Since the liquid crystal display panel of the liquid crystal display device does not emit light by itself, the liquid crystal display panel includes a backlight for providing light to the liquid crystal display panel from under the liquid crystal display panel. In a large liquid crystal display such as a digital TV, since a plurality of lamps are used as a backlight, a large number of parts are used, which causes a complicated assembly process. In addition, since the thickness of the backlight assembly is increased in order to prevent breakage of the lamp which is weak to external impact, there is a problem in that the thickness of the liquid crystal display is increased as a whole.

In order to solve this problem, a surface light source device in which a gas is injected inside to emit light by discharge has been developed. As such a surface light source device, a surface light source device has been developed in which a plurality of discharge units in which a discharge unit is arranged along the longitudinal direction of the surface light source device and the electrodes are arranged side by side are arranged in parallel. In the case of such a surface light source device, since the discharge period is driven in parallel, the driving voltage is low, but the discharge efficiency is lowered because the length between the discharge electrodes is short.

In order to solve this problem, a surface light source device in which a partition wall is formed to form the entire surface light source device as one discharge unit and electrodes are provided at both ends of the discharge passage formed as the partition wall has been developed. In the case of such a surface light source device, there is a low discharge holding voltage according to the enlargement, but there is a problem that a high discharge start voltage is required. In addition, the surface light source device having such a structure is not only difficult to install the internal electrode, but also the productivity decreases due to an increase in the defective rate due to internal electrode breakage.

In order to compensate for this, a surface light source device using an external electrode instead of an internal electrode and divided into a main electrode and an auxiliary electrode has been developed. Although the surface light source device forms a separate auxiliary electrode in order to prevent the driving voltage from becoming very large by the main electrode, thereby lowering the driving voltage of the main electrode, there is a problem in that the auxiliary electrode must be separately installed.

The present invention has been made to solve the above-mentioned problems, and to provide a surface light source device having a low discharge sustain voltage and a discharge start voltage and excellent discharge efficiency.

In order to achieve the above object, the surface light source device according to the present invention includes a lower substrate, an upper substrate covering the lower substrate to form a discharge region together with the lower substrate, and a plurality of agents forming a plurality of discharge units by partitioning the discharge region. A plurality of barrier ribs are disposed on any one of the first barrier rib, the edge portion of the upper substrate parallel to the first barrier rib, and the first barrier rib, and between the first barrier ribs, and one end side thereof is alternately alternately opened. And a second electrode, a first electrode and a second electrode provided at both ends of the discharge unit to cause discharge, and phosphor layers formed on inner surfaces of the lower substrate and the upper substrate.

Here, the first electrode and the second electrode may be installed on the upper surface of the upper substrate or the lower surface of the lower substrate.

In addition, the first electrode and the second electrode may be installed on the upper surface of the lower substrate to be exposed to the outside.

In addition, a dielectric layer may be formed on the first electrode and the second electrode in the discharge region.

In addition, a protective film may be formed on the dielectric layer.

In the surface light source device according to the present invention, it is preferable that any one of the first electrodes or the second electrodes of the discharge unit and another neighboring discharge unit is located side by side next to each other.

The first partition wall and the second partition wall may be formed under the upper substrate.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 8. These embodiments of the present invention are merely for illustrating the present invention, but the present invention is not limited thereto.

1 is an exploded perspective view of a surface light source device 100 according to a first embodiment of the present invention, and shows a surface light source device 100 in which a plurality of partitions 18 and 19 are formed along an X-axis direction. The structure of the surface light source device 100 is only for illustrating the present invention, and the present invention is not limited thereto. Therefore, the surface light source device 100 can be modified into other structures.

The surface light source device 100 shown in FIG. 1 includes a lower substrate 103 and an upper substrate 101 covering the lower substrate 103 to form a discharge region together with the lower substrate 103. 19) and the electrodes 11, 13, 15, and 17 (the electrode 17 is shown in FIG. 4, hereinafter same) are provided. After the frit is applied and sealed between the upper substrate 101 and the lower substrate 103, a vacuum is formed therein by bleeding air through the exhaust hole 16. Next, an inert gas such as Hg, Ar, Ne, Xe and K is injected into the discharge gas through the exhaust hole 16 and then sealed.

The partition walls 18 and 19 include a plurality of first partition walls 19 that partition the discharge regions to form a plurality of discharge units. An exhaust tunnel 191 is formed at an intermediate side surface of the first partition wall 19 to uniformly adjust the pressure between the discharge units. The second partition wall 18 is formed between the edge portion 1011 of the upper substrate 101 parallel to the first partition wall 19 and the first partition wall 19, or between the first partition walls 19. . The 1st partition 19 is longer than the 2nd partition 18, and the 2nd partition 18 is provided so that one end side may open alternately. Accordingly, since the discharge occurs continuously through the opened portion, there is an advantage in that the discharge efficiency can be improved by increasing the distance between the electrodes that cause the discharge as a whole.

In the discharge unit partitioned by the first partition wall 19, an even number of second partition walls 18 are provided, and electrodes are provided at both ends of the discharge unit. In FIG. 1, two second partitions 18 are shown to be located in one discharge unit, but this is merely to illustrate the present invention, but the present invention is not limited thereto. Therefore, even if the second partition 18 is installed in even numbers.

The first electrodes 11 and 13 and the second electrodes 15 and 17 which cause discharge in the discharge unit are provided at both ends of the discharge unit, respectively. The first electrodes 11 and 13 and the second electrodes 15 and 17 are applied with a voltage to emit electrons, and excite discharge gas charged therein to generate ultraviolet rays. The generated ultraviolet rays excite the phosphor layer 14 (shown in FIG. 4) formed on the inner surfaces of the upper substrate 101 and the lower substrate 103 to generate visible light. The phosphor layer 14 emits white light by colliding with the ultraviolet light because the light emitting material of red (R), green (G), and blue (B) is evenly distributed. On the lower substrate 103, a reflective layer 12 made of thick film paste of Al ₂ O ₃ , TiO ₂ , and SiO ₂ having high reflection efficiency is formed to reflect light toward the upper substrate 101.

2 is a perspective view illustrating a surface light source device 100 according to a first embodiment of the present invention, wherein the surface light source device 100 is provided with an electrode on an upper surface of the upper substrate 101 or a lower surface of the lower substrate 103. Indicates.

The electrodes 11, 13, 15, and 17 alternately arrange the positive electrode and the negative electrode along the Y-axis direction, and include metals such as Al, Au, Cr, and Ag by sputtering or paste. To form.

As shown in FIG. 2, the first electrodes 11 and 13 are positioned on the upper surface of the upper substrate 101 and the lower surface of the lower substrate 103, respectively. In addition, the second electrodes 15 and 17 are also positioned on the upper surface of the upper substrate 101 and the lower surface of the lower substrate 103, respectively. As described above, since the electrode is formed outside the surface light source device 100, there is an advantage in that electrical connection with an external device for applying a voltage is easy.

3 is a plan view of the surface light source device 100 according to the first embodiment of the present invention, showing a state in which three discharge units are formed in one discharge region. Each discharge unit is formed between the first partition wall 19 and the edge member 105 or between the first partition walls 19. In each discharge unit, open second partition walls 18 are alternately arranged at one end side to lengthen the lengths between the electrodes 11 and 15. Accordingly, the driving voltage for discharging is low, and the discharge efficiency of the surface light source device 100 is excellent.

4A and 4B are partial cross-sectional views of the AA and BB lines of FIG. 2, respectively, and illustrate a surface light source device having first and second electrodes 11 and 13 and 15 and 17 formed therein, respectively. Indicates.

The first electrodes 11 and 13 and the second electrodes 15 and 17 are paired, respectively, and applied with a voltage to emit electrons, thereby discharging the discharge gas contained in the surface light source device. Here, the upper substrate 101 and the lower substrate 103 serves as a dielectric layer. As such, since the upper substrate 101 and the lower substrate 103 serve as dielectric layers, a separate dielectric layer is not required and discharge is stable.

Hereinafter, various modifications of the present invention will be described in more detail with reference to the second to fifth embodiments of the present invention.

FIG. 5 is a partial cross-sectional view of the surface light source device 200 according to the second embodiment of the present invention, and the surface light source device 200 at the same position as the surface light source device according to the first embodiment of the present invention shown in FIG. 4. It is a figure which shows the cross section which cut. Since the surface light source device 200 according to the second embodiment of the present invention is the same as the surface light source device according to the first embodiment of the present invention except for the electrode 21 and the dielectric layer 23, the same drawings are used for the same part. The sign is used and its detailed description is omitted. In addition, since the right part in sectional drawing of FIG. 5 is symmetric with the left part, the illustration is abbreviate | omitted.

As shown in FIG. 5, in the surface light source device 200 according to the second embodiment of the present invention, an electrode 21 is located inside the surface light source device. The electrode 21 is installed on the upper surface of the lower substrate 103 and exposed to the outside to receive a voltage through the outside. A dielectric layer 23 is formed on the electrode 21 in the discharge region to protect the electrode 21 during discharge. Even if the electrode 21 is exposed from the inside of the surface light source device 200 to the outside, the electrode 21 is sealed with the frit 18 to maintain the internal vacuum, so that the surface light source device 200 may not be damaged.

FIG. 6 is a partial cross-sectional view of the surface light source device 300 according to the third embodiment of the present invention, and the surface light source device 300 at the same position as the surface light source device according to the second embodiment of the present invention shown in FIG. 5. It is a figure which shows the cross section which cut. Since the surface light source device 300 according to the third embodiment of the present invention is the same as the surface light source device according to the second embodiment of the present invention except for the protective layer 31, the same reference numerals are used for the same parts. The detailed description is omitted. In addition, since the right part in sectional drawing of FIG. 6 is symmetric with the left part, the illustration is abbreviate | omitted.

As shown in FIG. 6, the protective layer 31 is formed on the dielectric layer 23 to protect the dielectric layer 23 during discharge and to allow secondary electrons to be well discharged. The protective layer 23 can be made of MgO or the like.

7 is a plan view of the surface light source device 400 according to the fourth embodiment of the present invention, except for the electrode arrangement of the surface light source device 400, the structure is the surface light source device according to the first embodiment of the present invention. Is the same as Therefore, the same reference numerals are used for the same parts and detailed description thereof will be omitted.

As shown in FIG. 7, one of the first electrodes 41 and 43 or the second electrodes 45 and 47 of the discharge unit positioned along the Y axis and another discharge unit adjacent to the discharge unit is mutually connected. Located next to each other. Here, the first electrodes 41 and 43 and the second electrodes 45 and 47 have opposite polarities. Thus, the electrode can be arrange | positioned and the discharge unit excellent in discharge efficiency can be ensured.

8 is an exploded perspective view of the surface light source device 500 according to the fifth embodiment of the present invention, and is a view showing a cut portion of the edge portion of the surface light source device 500.

As shown in FIG. 8, a partition wall 59 is formed below the upper substrate 501 of the surface light source device 500 according to the fifth embodiment of the present invention. In this manner, the surface light source device 500 is manufactured by combining the upper substrate 501 and the lower substrate 503 having the partition walls 59 formed thereon. When the upper substrate 501 having the barrier ribs 59 formed thereon is combined with the lower substrate 502 as described above, the barrier rib formation process is unnecessary and thus, the assembly process is simple.

As described above, in the surface light source device according to the present invention, the second partition wall is provided between at least one of the edge portion of the upper substrate parallel to the first partition wall and the first partition wall, and between the first partition walls, Since the one end side is provided with a plurality of openings alternately alternately, the length between the electrodes for emitting electrons for discharging increases, there is an advantage that the discharge efficiency is excellent.

In addition, since the first electrode and the second electrode are provided on the upper surface of the upper substrate or the lower surface of the lower substrate, there is an advantage that the voltage is easily applied from the outside by being located outside the surface light source device.

Here, the first electrode and the second electrode may be installed on the upper surface of the lower substrate to be exposed to the outside.

A dielectric layer may be formed on the first electrode and the second electrode in the discharge region to protect the first electrode and the second electrode from discharge.

A protective film may be formed on the dielectric layer to prevent damage to the dielectric layer and to release secondary electrons.

Since any one of the first electrodes or the second electrodes of the discharge unit and another neighboring discharge unit may be located next to each other and next to each other, the arrangement of the electrodes can be simply and freely changed.

The first partition wall and the second partition wall may be formed under the upper substrate to simplify the manufacturing process of the surface light source device.

Although the present invention has been described above, it will be readily understood by those skilled in the art that various modifications and variations are possible without departing from the spirit and scope of the claims set out below.

Claims (7)

Bottom substrate, An upper substrate covering the lower substrate to form a discharge region together with the lower substrate, A plurality of first partition walls that partition the discharge region to form a plurality of discharge units arranged next to each other; A plurality of second partition walls provided in a direction parallel to the plurality of first partition walls so that one end side thereof is alternately alternately opened in the discharge unit; A first electrode and a second electrode provided in a space partitioned by the second partition walls at both ends of the diagonal direction of the discharge unit and positioned to face each other in the diagonal direction to cause discharge; and Phosphor layer formed on the inner surface of the lower substrate and the upper substrate Surface light source device comprising a. In claim 1, And the first electrode and the second electrode are provided on an upper surface of the upper substrate or a lower surface of the lower substrate. In claim 1, And the first electrode and the second electrode are disposed on an upper surface of the lower substrate and exposed to the outside. In claim 3, And a dielectric layer formed on said first electrode and said second electrode in said discharge region. In claim 4, A surface light source device having a protective film formed on the dielectric layer. In claim 1, And one of the first electrodes and the second electrodes of the discharge unit and another discharge unit adjacent to the discharge unit are located next to each other and side by side. In claim 1, And the first and second partition walls are formed under the upper substrate.

Images