KR100725106B1 - A flat light source device and method for fabricating the same - Google Patents

Abstract

Disclosed are a surface light source device capable of maximizing luminance efficiency by improving an electrode structure of a large area mercury surface light source device, and a manufacturing method thereof. A flat electrode filled with a gas filler and encapsulated with a fluorescent material or a mixture of fluorescent materials on a first inner wall, and partially disposed on a discharge tube and a strip-shaped electrode disposed on a second inner wall facing the first inner wall of the discharge tube. In the surface light source device comprising a plurality of members, a plurality of members are arranged on the upper surface of the second inner wall spaced apart from each other by a predetermined distance, each side wall is formed to have a predetermined oblique angle with respect to the second inner wall, Among the strip-shaped electrodes, a cathode electrode is formed on the second inner wall surface between the plurality of members, and an anode electrode is formed on each side wall of the plurality of members. Therefore, the area facing each other between the cathode and the anode is increased, a strong discharge phenomenon can be generated between the two electrodes, and the luminance efficiency in the mercury-free surface light source device can be maximized.

Description

A surface light source device and its manufacturing method {A FLAT LIGHT SOURCE DEVICE AND METHOD FOR FABRICATING THE SAME}

1 is a plan view showing the electrode structure of a conventional surface light source device;

2 is a cross-sectional view showing a cross-sectional structure of an electrode of the conventional surface light source device shown in FIG.

3 is a plan view showing the electrode structure of the surface light source device according to an embodiment of the present invention; And

4 is a cross-sectional view showing a cross-sectional structure of an electrode of the surface light source device according to an embodiment of the present invention shown in FIG.

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

101: lower plate

102: upper plate

104, 106: 1st, 2nd frame

107, 109: first and second cathode

108: phosphor

111, 113, 115: 1st, 2nd, 3rd frit glass

117, 119, 121, 123: first, second, third, fourth anode

The present invention relates to a surface light source device, and more particularly, to a surface light source device that can maximize the luminance efficiency by improving the electrode structure of a large area mercury surface light source device, and a manufacturing method thereof.

At present, a side light type surface light source device is generally used as a light source of a liquid crystal display device for a notebook computer monitor. That is, a cold cathode tube lamp is provided at one end or both ends of the light guide plate for guiding light, and the light from the cold cathode tube lamp is converted into a surface light source through the light guide plate. Such a side light type surface light source device is preferable in that the overall thickness of the liquid crystal display device can be reduced in thickness and weight is reduced. However, in a cold cathode tube lamp, a large amount of mercury, which has a great influence on the luminance efficiency, is used for phosphors, and the scope of its use is strictly limited by the convention regulating the use of environmental pollutants such as mercury.

Therefore, researches on mercury-free surface light source devices have been actively conducted in recent years, and large area mercury-free surface light source devices are more preferable than linear lamps for driving large-area liquid crystal display panels such as plasma display panels.

1 is a plan view showing the electrode structure of a conventional large area mercury-free surface light source device. 2 is a cross-sectional view showing a cross-sectional structure of an electrode of the conventional surface light source device shown in FIG.                         

1 and 2, the lower plate 12 and the upper plate 13 formed of a non-conductive material are enclosed by the frames 15 and 17, and the phosphor layer 19 is applied to the upper plate 13. It is. In addition, on the lower plate 12, the cathodes 18, 20 and the anodes 22, 24, 26 are alternately arranged in a strip form. Among the anodes 22, 24, 26, the anode 24 arranged between the cathodes 18, 20 is formed in the form of a double strip. In addition, the cathodes 18 and 20 have a single strip structure, but have a form of irregularities so as to partially protrude in the direction of the anodes 22, 24 and 26. This minimizes the separation distance between the cathodes 18, 20 and the anodes 22, 24, 26 so that a strong discharge is induced between the two electrodes. As the phosphor applied to the upper plate 13 is excited by the discharge of the two electrodes, light is emitted through the upper plate 13.

However, in the mercury-free surface light source device as described above, the light efficiency is usually maintained at about 28-30 lm / watt as compared with the improvement of the life characteristics. This is very low luminance efficiency, which is unsuitable for use in large area plasma display panels and the like, compared with light efficiency maintained at about 60-80 lm / watt of surface light source using mercury. In addition, in the mercury-free surface light source device described above, since the cathodes 18, 20 and the anodes 22, 24, and 26 are all formed on the lower plate 12 in a printing manner, the areas facing each other are small, and as a result, the discharge effect is reduced. There is a problem of deterioration.

The present invention proposed to solve the above problems is to provide a surface light source device that can maximize the luminance efficiency by improving the electrode structure of a large area mercury surface light source device.

Another object of the present invention is to provide a method of manufacturing a surface light source device having an electrode structure capable of maximizing the luminance efficiency of a large area mercury surface light source device.

The surface light source device according to the present invention for achieving the above object is a planar type filled with a gas filler and encapsulated, and has a fluorescent material or a fluorescent material mixture layer on the first inner wall, and has a partially transmissive discharge tube and the discharge tube. A surface light source device including strip-shaped electrodes disposed on a second inner wall facing the first inner wall, wherein the upper surface of the second inner wall is spaced apart from each other by a predetermined distance, and each side wall is disposed on the second inner wall. And a plurality of members formed to have a predetermined oblique angle with respect to the electrode, wherein the strip-shaped electrodes are formed on a cathode electrode formed on the second inner wall surface between the plurality of members and an anode formed on each sidewall of the plurality of members. An electrode is provided.

The method for manufacturing the surface light source device according to the present invention for achieving the above object includes a first inner wall to which a fluorescent material or a fluorescent material mixture layer is applied and partially transmissive and a second inner wall facing the first inner wall. Preparing a discharge tube having a planar discharge tube filled with a gas filler, and preparing a plurality of members each sidewall having a predetermined oblique angle with respect to the second inner wall; Arranging an anode electrode on each side wall, arranging a plurality of members on the second inner wall of the discharge tube spaced apart from each other by a predetermined distance, and on the second inner wall of the discharge tube; Arranging a cathode electrode between the plurality of members.

In this case, the plurality of members are frit glass, and the oblique angle of each side wall of the plurality of members with respect to the second inner wall is determined within a range of 30 to 100 °.

According to such a surface light source device and a manufacturing method thereof, the cathode is arranged in a printing manner on the lower plate, and the anode is arranged on the sidewall of the frit glass to have a predetermined oblique angle with respect to the lower plate.

Therefore, the area facing each other between the cathode and the anode is increased, and a strong discharge phenomenon can be generated between the two electrodes. Therefore, the luminance efficiency in the mercury free surface light source device can be maximized.

Hereinafter, a surface light source device and a manufacturing method thereof according to an exemplary embodiment of the present invention will be described in more detail with reference to FIGS. 3 and 4.

3 is a plan view showing the electrode structure of the surface light source device according to an embodiment of the present invention, Figure 4 is a cross-sectional structure of the electrode of the surface light source device according to an embodiment of the present invention shown in FIG. It is a cross section.

3 and 4, the bottom plates 101, 102 made of non-conductive material are likewise supported and enclosed by the first and second frames 104, 106 made of non-conductive material. The upper plate 102 is coated with a phosphor layer 108 composed of a fluorescent material or a mixture of fluorescent materials.

As shown in FIG. 3, first and second cathodes 107 and 109 are arranged on the lower plate 101 at a predetermined distance, and the first and second cathodes 107 and 109 are disposed. Is formed on the lower plate 101 through a printing technique well known in the art. The first and second cathodes 107 and 109 are supplied with an operating power (−) provided from the outside by the conductive pattern 103 printed on the lower plate 101.

On both sides of each of the first and second cathodes 107, 109, frit glass (first, second, third, and third frit glasses 111, 113, and 115) that provides an adhesive force between the glass substrate and the glass substrate upon adhesion. Is arranged on the lower plate 101. The first to third frit glasses 111, 113, and 115 are glasses interposed between the glass substrate and the glass substrate to provide adhesion by melting in response to heat applied from the outside.

Here, similarly, the first to third frit glasses 111, 113, and 115 are arranged on the lower plate 101, and then the first to third frit glasses 111, 113, and 115 are operated at a predetermined temperature. When heat is applied to the first to third frit grass (111, 113, 115) is melted and bonded to the lower plate 101.

Referring to FIG. 4, each of the first to third frit glasses 111, 113, and 115 has a rectangular cross-sectional shape. Bottom surfaces of the first to third frit glasses 111, 113, and 115 that are bonded to the lower plate 101 have a wider width than opposite upper surfaces.

That is, both side walls of the first to third frit glasses 111, 113, and 115 are formed to be inclined with respect to the bottom surface of the lower plate 101. Here, the oblique angle with respect to the bottom surface of the lower plate 101 of both side walls of the first to third frit glasses 111, 113, and 115 is determined in the range of 30 to 100 °.

Next, the first to fourth anodes 117, 119, 121, and 123 for generating a discharge between the first and second cathodes 107 and 109 to excite the phosphor 108 are formed in the first to the first to second electrodes. It is formed in a print manner on each sidewall of the three frit glasses 111, 113, and 115.

The first and fourth anodes 117 and 123 are arranged on sidewalls of the first and third frit glasses 111 and 115 positioned outside the first and second cathodes 107 and 109, respectively. The second and third anodes 119 and 121 are arranged on both side walls of the second frit glass 113. The first to fourth anodes 117, 119, 121, and 123 are supplied with power (+) provided from the outside through the conductive pattern 105 printed on the lower plate 101.

As shown in FIG. 4, the first to the second arranged on the sidewalls of the first to third frit glasses 111, 113, and 115 having a predetermined oblique angle with respect to the bottom surface of the lower plate 101. The four anodes 117, 119, 121, 123 likewise have the same oblique angle with respect to the lower plate 101.

As such, when the first to fourth anodes 117, 119, 121, and 123 are arranged to have a predetermined oblique angle with respect to the lower plate 101, the first and second cathodes 107, 109 and the Areas facing each other with the first to fourth anodes 117, 119, 121, 123 increase. Thus, a strong discharge is induced to excite the phosphor 108 between the first and second cathodes 107, 109 and the first to fourth anodes 117, 119, 121, 123, whereby Accordingly, the efficiency of light emitted through the upper plate 102 may be increased.

Although not shown in the drawings, a dielectric film is formed on the first to fourth anodes 117, 119, 121, and 123 to protect the first to fourth anodes 117, 119, 121, and 123.

In addition, the first to fourth anodes 117, 119, 121, and 123 are connected to the electrode wires for supplying power (+) by using a wire bonding method or the first to fourth anodes. A conductive pattern is wired to a lower surface of one end of the first to third frit glasses 111, 113, and 115 where the 117, 119, 121, and 123 are arranged to contact an electrode line formed on the lower plate 101. You can also connect if possible.

According to the surface light source device as described above, the phosphor coated inside the enclosed surface light source device is excited by performing a discharge operation in response to a power source supplied from the outside with the anode and the cathode arranged on the plate below the phosphor. To cause light emission.

At this time, the cathode is arranged in a print manner on the lower plate, and the anode is arranged on the sidewall of the frit glass to have a predetermined oblique angle with respect to the lower plate. Therefore, the area facing each other between the cathode and the anode is increased, and a strong discharge phenomenon can be generated between the two electrodes. Therefore, the light efficiency in the mercury free surface light source device can be maximized.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

Claims (6)

A flat electrode filled with a gas filler and encapsulated with a fluorescent material or a mixture of fluorescent materials on a first inner wall, and partially disposed on a discharge tube and a strip-shaped electrode disposed on a second inner wall facing the first inner wall of the discharge tube. In the surface light source device comprising a Disposed on the upper surface of the second inner wall and spaced apart from each other, each sidewall includes a plurality of members inclined with respect to the second inner wall, And the strip-shaped electrodes include a cathode electrode formed on the second inner wall surface between the plurality of members and an anode electrode formed on each side wall of the plurality of members. The surface light source device of claim 1, wherein the plurality of members are frit glass. The surface light source device according to claim 2, wherein an inclined angle of each side wall of the plurality of members with respect to the second inner wall is determined within a range of 30 to 100 degrees. Preparing a planar discharge tube having a fluorescent material or a fluorescent material mixture layer applied thereto, the first inner wall partially transmissive and the second inner wall facing the first inner wall and filled with a gas filler; Preparing a plurality of members formed such that each side wall is inclined with respect to the second inner wall; Arranging anode electrodes on each sidewall of the plurality of members; Arranging a plurality of members on which the anode electrodes are arranged on the second inner wall of the discharge tube, spaced apart from each other ; And And arranging a cathode electrode between the plurality of members on a second inner wall of the discharge tube. The method of manufacturing a surface light source device according to claim 4, wherein the plurality of members are frit glass. The method of manufacturing a surface light source device according to claim 5, wherein an inclined angle of each side wall of the plurality of members with respect to the second inner wall is determined within a range of 30 to 100 degrees.

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