KR100451628B1 - Florescent Lamp with External Electrode for LCD and Back Light Device using of it - Google Patents

Abstract

The present invention relates to a surface-emitting fluorescent lamp for an LCD backlight, and more particularly, by making the electrode of the surface-emitting fluorescent lamp used for an LCD backlight in an electrodeless manner, the manufacturing process is simplified and productivity is improved. The present invention relates to an electrodeless surface emitting fluorescent lamp for an LCD and a backlight device using the same, which can be easily applied to a large backlight and can produce an LCD in a small and thin form.

The above-described electrodeless surface emitting fluorescent lamp for LCD of the present invention includes a lamp top plate having a predetermined thickness and a flat plate structure having a predetermined cross section for maximizing luminance uniformity within a predetermined distance from a surface thereof, and having a flat structure. A lamp lower plate having a predetermined thickness configured to be connected to the upper and lower lamps to form a mutually communicating channel, and an external electrode and an auxiliary electrode are respectively provided on surfaces of both end portions of the lamp upper plate. In addition, according to another feature of the present invention, the discharge gas is blocked to prevent the discharge gas from passing through the portions of the mutually adjacent channels, and a plurality of gas passages for changing the thickness, the installation position, and the number of installations therebetween are installed to communicate with each other. It provides a structure that can further promote the movement of.

Description

Electroless surface emitting fluorescent lamp for LCD and backlight device using the same {Florescent Lamp with External Electrode for LCD and Back Light Device using of it}

The present invention relates to a surface-emitting fluorescent lamp for an LCD backlight, and more particularly, the manufacturing process of the surface-emitting fluorescent lamp is simplified by configuring the electrode of the surface-emitting fluorescent lamp used for the backlight of the LCD in an electrodeless manner. The present invention relates to an electrodeless surface emitting fluorescent lamp for an LCD and a backlight device using the same, which can be used to produce a large backlight and to produce an LCD in a small and thin form.

LCD devices, which are in the spotlight in flat panel display devices, include a backlight device that provides a separate light source because they are non-light emitting devices that do not emit light by themselves. Such backlight devices are classified into direct type and edge type. The above methods are classified according to the position of the light source (lamp). The edge type is a surface light source obtained by placing the light source on the side end surface of the transparent light guide plate and reflecting and diffusing one side of the light guide plate to reflect the light multiple times. The direct type is a method of reflecting and diffusing light emitted from the light source by placing the light source directly under the LCD cell, distributing a plate on the front of the light source, and a reflecting plate on the back of the light source. The direct type is suitable for a backlight requiring high luminance because high luminance can be obtained, but has a disadvantage of low luminance uniformity. On the other hand, the edge type has the advantage of low luminance but high luminance uniformity.

In order to improve the disadvantages of each of these methods, a flat panel surface emitting fluorescent lamp has been developed and applied by the applicant. 1 is a plan view of a conventional surface-emitting fluorescent lamp. As shown in the figure, a lamp top plate is formed in the form of a sulfentine, in which discharge gas is injected inside and channels blocked from the outside are adjacent to each other, and a bent portion is connected to each other so that one inside is a single channel (single channel). ). At each end, an internal electrode 1 is provided.

FIG. 2 is a cross-sectional view taken along line A-A of the surface emitting fluorescent lamp 3 of FIG. 1, showing cross sections of the channels 3a formed adjacent to each other. In reality, each of the visible channels 3a are in communication with each other to constitute a passage. In the figure, the cross-section of part A shows a semicircle, but the shape of the channel 3a can be variously changed into a rectangle, a rhombus shape, and the like.

3 is a cross-sectional view taken along the line B-B in FIG. 1, illustrating the installation state of the internal electrode 1 of the surface emitting fluorescent lamp 3. As shown, one end of the internal electrode 1 is inserted into the surface emitting fluorescent lamp 3, and many manufacturing processes are added to insert and fix the internal electrode 1 in this way.

Since the surface-emitting fluorescent lamp 3 emits light uniformly over the entire surface area, the surface-emitting fluorescent lamp 3 can provide a high brightness and high brightness uniformity by compensating the disadvantages of the conventional edge method and the direct method, in particular sulfentine (serpentine). In this case, the luminance and luminance uniformity are remarkably improved. In addition, the shape can be modified like L-shaped, W-shaped and the like. Such a shape is usually formed in the shape of the lamp upper plate L-shaped, W-shaped, the lower plate of the lamp is composed of a flat plate to be manufactured by combining the top and bottom, or integrally produced.

However, as the structure of the fluorescent lamp is diversified, the installation position of the internal electrode 1 for supplying power to the fluorescent lamp is frequently changed, and thus, there is an inconvenience in that the manufacturing facilities have to be changed. Furthermore, by fixing the internal electrode 1 to be inserted into the surface emitting fluorescent lamp 3, the manufacturing process of the fluorescent lamp is increased, resulting in problems such as reduced productivity due to breakage of the internal electrode. In addition, when several fluorescent lamps are connected in parallel for use in large backlights, wiring is complicated when connecting inverters to respective electrodes, thereby increasing the volume of the backlight device.

The present invention is to solve the above problems, an object of the present invention is to simplify the manufacturing process of the surface-emitting fluorescent lamp by configuring the electrode of the surface-emitting fluorescent lamp used for the backlight of LCD (LCD) in an electrodeless manner. It is to provide an electrodeless surface emitting fluorescent lamp for an LCD and a backlight device using the same, which can improve productivity and facilitate the manufacture of a large backlight, and can produce an LCD in a small and thin form.

Another object of the present invention is to provide a getter and a getter housing structure that can supply mercury into the channel of the fluorescent lamp inside the surface emitting fluorescent lamp and absorb various impurities, and provides an electrodeless surface emitting fluorescent lamp for an LCD. And to provide a backlight device using the same.

1 is a plan view showing the structure of a surface emitting fluorescent lamp,

2 is a cross-sectional view taken along the line A-A of FIG.

3 is a cross-sectional view taken along the line B-B of FIG.

4 is a plan view of an electrodeless surface emitting fluorescent lamp according to the present invention;

5 is a plan view of another embodiment of a fluorescent lamp according to the present invention;

6 is an installation state of the auxiliary electrode of the surface-emitting fluorescent lamp of the present invention,

7 is another installation state of the auxiliary electrode of the surface-emitting fluorescent lamp of the present invention,

8 is a cross-sectional perspective view showing a getter installation state of the portion B ′ of FIG. 4;

9 is a cross-sectional perspective view showing another installation state of the getter,

10 is a side sectional view showing a structure of a backlight device according to the present invention;

※ Explanation of symbols about main part of drawing ※

1: internal electrode 2: external electrode

2a: auxiliary electrode 2b: auxiliary electrode

3: surface emitting fluorescent lamps 3a, 3b: channel

5: upper lamp 6: lower lamp

7: gas passage 8: getter

9: getter housing 10: channel gap

12: diffuser plate 14: reflector plate

An electrodeless surface emitting fluorescent lamp for an LCD of the present invention for achieving the above object is a lamp top plate of a predetermined thickness having a predetermined cross section for maximizing luminance uniformity within a predetermined distance from a surface, and formed of a sulfentin shape, and a flat plate. It has a structure and is configured to install a lower electrode and a predetermined electrode on the surface of both ends of the lamp lower plate of a predetermined thickness configured to form a channel that is connected to the upper and lower lamp upper plate and communicate with each other.

In addition, according to another feature of the present invention, the discharge gas is blocked to prevent the discharge gas from passing through the portions of the mutually adjacent channels, and a plurality of gas passages for changing the thickness, the installation position, and the number of installations therebetween are installed to communicate with each other. It provides a structure that can further promote the movement of.

Hereinafter, an electrodeless surface emitting fluorescent lamp for an LCD and a backlight device using the same of the present invention will be described in detail with reference to the accompanying drawings.

4 is a plan view showing the structure of the electrodeless surface emitting fluorescent lamp 3 according to the present invention. As shown, it can be seen that a linear external electrode 2 is provided at both ends of the surface emitting fluorescent lamp 3 having a sulfentin shape and configured as a single channel. The external electrode 2 is simply configured by attaching a conductive material through which electricity is well communicated. In particular, since the external surface must supply energy to the inside, it has sufficient surface area to supply sufficient excitation energy.

The external electrode 2 serves to supply a high voltage to the surface emitting fluorescent lamp 3 so that the surface emitting fluorescent lamp 3 can be sufficiently excited when a high voltage pulse is applied from the outside. For example, copper or aluminum tape. At this time, the attachment form of the conductive object is completed by fixing it so that it is not inserted into the surface-emitting fluorescent lamp 3 like the internal electrode 1 but contacts the surface and is not detached during operation.

FIG. 5 shows a modification in which the gas passage 7 is formed between the channels 3b of the electrodeless surface emitting fluorescent lamp 3 of the present invention. This is because the electrodeless surface emitting fluorescent lamp 3 shown in FIG. 4 is connected to each other by the gas passage 7 while the curved portions are interconnected to form a single channel. will be. This structure has the advantage that the discharge gas can be uniformly distributed within the surface emitting fluorescent lamp 3 within a short time compared to the discharge gas moving speed in the single channel method shown in FIG. In the drawing, it has been described that one gas passage 7 is formed at each end of the horizontal portion of the channel, but the thickness, the installation position, and the number of installation of the gas passage 7 can be changed. It is obvious that it belongs to the scope of the invention. According to the length or thickness of the surface emitting fluorescent lamp 3, the thickness, position, and number of installations of the gas passage 7 can be changed to optimize the speed of gas distribution.

6 and 7 show an installation state of an auxiliary electrode for driving the electrodeless fluorescent lamp of the present invention at a low voltage. Since the auxiliary electrode has a long length of the electrodeless surface emitting fluorescent lamp 3, it is preferable to adopt the auxiliary electrode because a very large voltage is required to discharge the fluorescent lamp.

In other words, when a voltage is applied to the auxiliary electrode to which a separate power source is connected, charged particles are generated inside the fluorescent lamp 3, and then when voltage is applied to the external electrode 2 used as the main electrode, surface emission is performed. The fluorescent lamp 3 starts to discharge even at a low voltage. Therefore, using the auxiliary electrode has the advantage that can save more power than when using only the main electrode. The auxiliary electrodes may be installed on the surface of the surface emitting fluorescent lamp 3 in the same manner as the external electrode 2 and may be installed in a straight line instead of a large area.

In FIG. 6, it can be seen that the auxiliary electrode 2a is positioned to surround the channel 3b. In contrast, in FIG. 7, the auxiliary electrode 2b is positioned in the center of the channel 3b. The change of the installation position can be changed in consideration of the length, area, etc. of the electrodeless surface emitting fluorescent lamp 3. That is, if the response time of the surface emitting fluorescent lamp 3 is to be shortened, it is at the same position as the auxiliary electrode 2a of FIG. 6, and if the response time is allowed to be delayed to some extent, it is at the same position as the auxiliary electrode 2b of FIG. Install. In this case, it is preferable that the auxiliary electrodes use a different power source than the external electrodes.

In addition, the surface emitting fluorescent lamp 3 according to the present invention may be manufactured by fusion of the lamp upper plate 5 and the lamp lower plate 6 as an integral type or after each of them is manufactured in a separate form. At this time, the manufacturing in one piece is difficult to apply the phosphor, but there is an advantage that the manufacturing process is simplified by not going through the sealing (sealing) step. On the other hand, the separation fusion type is required to seal the junction (sealing), but there is an advantage that the coating of the phosphor is easy.

A getter is further inserted in the surface emitting fluorescent lamp 3 of the present invention. The getter 8 serves to provide mercury in the channel 3b of the surface emitting fluorescent lamp 3 and also absorbs various impurities present therein. The getter 8 is fixed by the getter housing 9 so as not to move in the channel.

8 and 9 show an embodiment of the shape of the getter housing 9. 8 is applicable to the case where the getter housing 8 is installed in a curved portion, that is, in the curved portion B 'of each channel shown in FIG. The getter housing 9 of FIG. 8 has a 1 / 4-circle shape for the part exposed to the outside, and the getter 8 is fixed to the inside with the central part protruding toward the inside. Of course, it is also possible to form a protrusion formed on both sides.

On the other hand, Fig. 9 shows that it is formed in a part of the channel having a straight shape, and it can be seen that both ends are configured to protrude inward. It is apparent that the fixing position of the getter 8 can be essentially anywhere within the range that does not interfere with the light emission of the surface emitting fluorescent lamp 3.

An embodiment of a backlight device constructed using the surface emitting fluorescent lamp 3 of the present invention having the above configuration is shown in FIG.

As shown, the diffuser plate 12 is located on the upper side, the reflector plate 14 is located on the lower side, and the surface emitting fluorescent lamp 3 is inserted therebetween. Although not shown in detail, the above-described diffuser plate 12, reflector plate 14, and surface emitting fluorescent lamp 3 are all fixed to the frame of the backlight device. The surface emitting fluorescent lamp 3 also has an external electrode 2 attached thereto as shown in FIG. 5 to supply power from the outside.

Each numerical value written in the side of Fig. 10 is an optimized manufacturing embodiment of a backlight having a luminance uniformity of 90% and a size of 15.1 "or larger. The thickness of the diffuser plate 12 is 2 mm and the thickness of the surface emitting fluorescent lamp 3 is shown. Is 7.1mm, the thickness of the reflector 14 is 1mm, the separation distance of the diffuser 12 and the surface emitting fluorescent lamp 3 is 1.9mm, the separation distance of the reflector 14 and the surface emitting fluorescent lamp 3 is 0.1 In mm, the total thickness is 12.1 mm. These values are optimized for the above conditions satisfying 15.1 "and luminance uniformity of 90% or more. In addition, a backlight is operated by applying a predetermined voltage to an external electrode 2 of the surface emitting fluorescent lamp 3 using a power supply circuit (not shown).

In the above-described backlight device, the surface emitting fluorescent lamp 3 is described in that only the external electrode 2 is attached. However, the surface emitting fluorescent lamp 3 further includes auxiliary electrodes 2a and 2b. It is evident that the gas passage can be manufactured as shown in FIG. 5, and that the getter housing 9 structure including the getter 8 therein can be applied. It can belong to the range.

According to the present invention, the electrode of the surface-emitting fluorescent lamp used for the backlight of the LCD (LCD) in a non-electrode method, the manufacturing process of the surface-emitting fluorescent lamp is simplified, the productivity is improved, and the large-size backlight is easy to manufacture And it has the effect of making LCD small and thin.

Claims (12)

In the surface emitting fluorescent lamp used in the backlight for LCD, A lamp top plate having a predetermined thickness and having a predetermined cross section for maximizing luminance uniformity within a predetermined distance from the surface, and having a sulfentin shape, and having a flat plate structure and being coupled up and down with the lamp top plate to form a mutually connected channel. Between the adjacent channels, a lamp lower plate of a predetermined thickness having a plurality of gas passages for changing the thickness, the installation position, and the number of installations so as to block discharge gas from passing therethrough and to allow the filling gas to pass therethrough, and both sides of the lamp upper plate. On the surface of the end, an external electrode and an auxiliary electrode provided on the surface in the form of sulfentin along the channel or perpendicular to the channel surface are respectively provided, and the excitation voltage is first supplied to the auxiliary electrode first. After a period of time, the external electrode is powered to turn on the surface emitting fluorescent lamp. An electrodeless surface emitting fluorescent lamp. delete delete delete The method of claim 1, A getter is inserted into the electrodeless surface emitting fluorescent lamp and absorbs various impurities present therein, and the getter moves inside the channel of the electrodeless surface emitting fluorescent lamp. An electrodeless surface emitting fluorescent lamp, characterized in that for forming a protrusion protruding toward both sides of the getter toward the inside, and in the curved portion the outer side is formed in a round shape. delete delete delete delete In the backlight device for LCD, A lamp top plate having a predetermined thickness and having a predetermined cross section for maximizing luminance uniformity within a predetermined distance from the surface, and having a sulfentin shape, and a plate structure having a flat structure and configured to be connected to the lamp top plate by being vertically connected to each other. A surface emitting fluorescent lamp having a thickness lower lamp plate, external electrodes on the surfaces of both ends of the lamp upper plate, and an auxiliary electrode provided on the surface of the lamp; A diffusion plate installed on an upper side of the electrodeless surface emitting fluorescent lamp, A reflector provided on a lower side of the electrodeless surface emitting fluorescent lamp, and And a power supply unit for first applying a predetermined voltage to the auxiliary electrode of the electrodeless surface emitting fluorescent lamp to excite the surface emitting fluorescent lamp, and then applying power to an external electrode. delete delete