KR20050070989A - A channel structure of lamp with wide-range light source - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source lamp, and in particular, a surface light source lamp having a structure suitable for use as a light source that evenly illuminates a flat surface such as a back light or other wide rectangular surface of a flat panel display such as a liquid crystal display (LCD). It is about.

The surface light source lamp of the present invention is a fluorescent lamp in which a continuous zigzag sealed discharge space is continuously partitioned into a discharge passage channel by a partition wall and at least one electrode is installed therein, wherein the width of the discharge passage channel is hot. It is characterized in that the narrower the further away from the (Hot) electrode. In addition, the discharge passage channel width is characterized in that it is changed depending on the size of the surface light source lamp, the characteristics and intensity of the power source, the distance from the electrode.

In addition, in the case of the surface light source lamp of which the lighting method is a hot-cold-hot method, the width of the discharge passage channel becomes narrower from both sides where the hot electrode is formed toward the center, and the lighting method is hot cold. In the case of the (Hot-Cold) type surface light source lamp, the width of the discharge passage channel becomes narrower from one side where the hot electrode is formed to the other side.

According to the present invention, the surface light source lamp having high luminance and high efficiency and stable light emission characteristics is realized to have a uniform luminance distribution, thereby maximizing the advantages of the liquid crystal display as a display device covering a large area, and improving the brightness of the conventional backlight. Unevenness, light utilization efficiency, and power consumption can be improved drastically.

Description

A channel structure of lamp with wide-range light source

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source lamp, and in particular, a surface light source lamp having a structure suitable for use as a light source that evenly illuminates a flat surface such as a back light or other wide rectangular surface of a flat panel display such as a liquid crystal display (LCD). It is about.

First of all, the liquid crystal display (LCD), which is most commonly used, is a liquid crystal display (CRT), a plasma display panel (PDP), a field emission display (FED), or a light emitting diode (Light Emitting). Unlike diodes and LEDs, it is a light-receiving type and cannot be used in dark places. In order to solve this problem, a backlight is installed on the back of the LCD to illuminate light so that the screen can be displayed even in a dark place.

Conventional backlights for LCDs have used cold cathode fluorescent lamps (CCFLs) in the form of customs and used them as light emitting sources. In applying CCFL as a backlight for LCD, a liquid crystal is formed by using a direct light method in which a plurality of CCFLs are mounted under a liquid crystal panel and a diffuser plate is installed between the CCFL and the liquid crystal panel, and a transparent light guide panel. The Edge Light method distributes the light emitted from the CCFL installed on the side of the panel to the entire LCD screen.In recent years, fluorescent layers and electrodes are installed inside the upper and lower substrates for more uniform light distribution. There is a surface light source method using the formed flat lamp.

In order to make a flat lamp, the flat glass plate is heated by using a mold designed to be processed to have a plurality of discharge spaces which are heated to a constant temperature capable of forming and are separated by partition walls and communicate with each other through a discharge passage. Forming a discharge space on the flat glass plate, taking out the molded glass plate having the discharge space from the mold and cooling it slowly, coating and firing the phosphor in the discharge space of the molded glass plate, and forming a discharge space on the molded glass plate. The front cover is overlapped and the front cover and the molded glass plate are bonded to each other through a seal paste. The exhaust chamber is evacuated, the discharge gas is injected, the exhaust pipe is sealed, and an electrode for applying high frequency power to the discharge space is installed.

The flat glass plate may be vacuum-molded by being placed at the bottom of the mold, or blow-molded simultaneously with vacuum molding by being placed at the top of the mold. In addition, the front cover may use a molded glass plate or a flat glass plate. The cross-sectional shape of the discharge space formed in the molded glass plate may be formed, for example, in a half circle, a half ellipse, a triangle, or a quadrangle.

A typical flat lamp of the prior art manufactured by the above method is disclosed in FIGS. 1 and 4.

1 is a plan view showing a rear glass plate of an internal electrode type flat fluorescent lamp of a hot-cold hot lighting method according to the related art, FIG. 2 is a sectional view taken along line aa 'of FIG. It is a detailed view of part B of 2.

1 to 3, the back glass plate 1 is generally rectangular in shape and partitioned by the partition walls 3 to form a continuous zigzag discharge space 2, each discharge space 2. Is connected by a discharge passage (6). Vacuum holes 5 are formed at both ends of the discharge space 2 and the discharge passage 6 serves as a vacuum passage at the time of manufacture. Internal electrodes 7 are provided at both sides of the discharge space 2. The discharge space 2 is composed of discharge passage channels having a rectangular structure of a constant size, and the distance between the partition walls and the partition walls partitioning the vertically arranged discharge passage channels is constant so that each discharge passage channel is substantially the same. It has a size specification. In the hot-cold hot type flat lamp, both sides of the electrode 7 are hot and the center is cold.

        However, the flat-type lamp of the hot-cold-hot lighting method according to the prior art as described above has a high voltage in the left and right portions in which the hot electrode has a high voltage applied through an inverter. Appears, but weakens towards the center cold side. As a result, the loss of light occurs toward the center of the lamp, so that the left and right sides of the lamp exhibit strong luminance, but the brightness gradually fades toward the center away from the hot electrode.

Figure 4 is a plan view showing a rear glass plate of a flat fluorescent lamp of the hot-cold lighting method according to the prior art.

A continuous zigzag discharge space 2 is partitioned into a discharge passage channel 6 by a partition wall 3, and the entire discharge space 2 is connected by a discharge passage channel 6. Internal electrodes 7 are also provided at both sides of the discharge space 2 and the horizontal widths of the discharge passage channels 6 are all the same. In this hot-cold flat type lamp, one of the electrodes on both sides is connected to the ground side, and the side connected to this ground side is cold, and the other side not connected to the ground side is Hot is formed.

    However, the hot-cold flat panel lamp according to the related art also has a high voltage applied to the hot electrode at the inverter, but gradually becomes weaker toward the opposite side of the cold side. As a result, the hot side has high brightness and brightness, but as the farther side moves away from the cold side, light loss occurs and the luminance gradually decreases, and brightness cannot be solved.

The present invention has been proposed to solve the above problems, and has a surface light source lamp that can provide a uniform luminance distribution regardless of the position of the electrode while having a stable light emission characteristics of high brightness and high efficiency to brighten the overall area evenly To provide.

In the surface light source lamp of the present invention for achieving the above object is a fluorescent lamp in which a continuous zigzag-shaped closed discharge space is partitioned into a discharge passage channel by a partition wall and at least one electrode is installed therein, The width of the discharge passage channel is characterized in that the narrower the distance from the electrode. In addition, the discharge passage channel width is characterized in that it is changed depending on the size of the surface light source lamp, the characteristics and intensity of the power source, the distance from the electrode.

In addition, in the case of the surface light source lamp of which the lighting method is Hot-Cold-Hot type, the discharge channel width becomes narrower from the hot electrodes on both sides to the cold electrodes on the center. In the case of the surface light source lamp of which the lighting method is a hot-cold method, the width of the discharge passage channel becomes narrower from the hot hot electrode on one side to the cold side electrode on the other side. .

Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

5 is a plan view of a surface light source lamp of a hot-cold hot method according to the present invention. The width of the discharge passage channel 16 formed in the discharge space 12 of the surface light source lamp according to the present invention has a wide width at the left side and the right side of the surface light source lamp to which the hot electrode is connected, unlike in the prior art. The width becomes proportionally narrower toward the center where the cold electrode is formed.

Mercury and a rare gas for discharge are injected into the discharge space. The internal electrode 17 may be both a cold cathode electrode or a hot cathode electrode.

The molded back glass plate 11 is foamed to form a front glass plate and a discharge space, and then bonded with a seal paste. The bonding method is to seal or apply the seal paste on both sides of the front glass plate and the rear glass plate 11 with a dispenser and to remove organic substances extremely harmful to discharge. Then, the front glass plate and the rear glass plate 11 are assembled and heated to a predetermined temperature. Bond.

After the front glass plate and the rear glass plate 11 are bonded together, the exhaust pipe formed on the rear glass plate is connected to a vacuum apparatus to be evacuated by heating and vacuum, and then mercury and rare gas for discharge are injected and the exhaust pipe is sealed. Mercury (Hg) may use a getter composed of liquid mercury or a mercury alloy.

Phosphors are formed on the front glass plate and the rear glass plate 11. Phosphor is formed on the front glass plate by a printing method, and phosphors are formed on the back glass plate 11 by spraying or applying a suspension.

After the phosphor is formed, it is fired to remove organic substances present in the phosphor, to adhere to the glass surface, to increase light efficiency, to improve lifespan, and to unstable discharge due to internal gas emission. In addition, it prevents the reduction of the brightness and luminous efficiency of the lamp according to the discharge of the internal gas during discharge, the shortening of the lifetime and maintains stable light emission.

When the lamp is discharged by applying a high frequency to the internal electrodes 17 provided at both ends, the lamp is ionized to discharge the rare gas atoms and mercury atoms for discharge in the tube in which the electrons accelerated by the electric field are activated, and the rare gas ions and mercury ions for discharge discharge the energy. Emits in the form of ultraviolet light. Ultraviolet rays generated at this time excite the phosphor formed in the discharge space 12 to emit visible light.

The partition 13 not only maintains the discharge space 12 but also serves as a support for preventing breakage of the front glass plate and the rear glass plate 11 when evacuating the discharge space 12.

As described above, in the case of all flat lamps according to the prior art, the specifications of each discharge passage channel formed in the discharge space are all constant, unlike in the case of the present invention. The flat lamp of this standard has high brightness and strong light in the left side and right side where the hot electrode is formed, and the ionization of the rare gas due to the discharge of the lamp and the emission of ultraviolet rays give high brightness, but the cold side The farther the center is formed, the weaker the strength is.

The brightness of the light itself varies depending on the size of the lamp applied to the surface light source lamp, the characteristics and intensity of the power, and the brightness of the light in the same surface light source lamp is assuming that the discharge passage channels have the same size. When the discharge passage channel is different in size and the discharge passage channel is different in size, the discharge passage channel is wider than the case where the discharge passage channel is wider. Compared with the wide case, the luminance is slower with distance. That is, the width of the discharge passage channel and the change in luminance are in proportional relationship.

Therefore, in the case of the hot-cold-hot surface light source lamp, the center part farthest from the hot electrode has higher luminance than the right side and the left side where the hot side electrode is installed. As low and dim light is produced, the overall luminance curve is V-shaped as shown in FIG.

Therefore, in the present invention, as shown in FIG. 5, the discharge passage channel near the hot electrode is wider and the discharge passage channel farther from the hot electrode has the width of the discharge passage channel. By proportionally narrowing according to the distance from the hot electrode and the hot side, the entire surface light source lamp emits light of the same brightness evenly.

As an example, referring to the drawing of the surface light source lamp disclosed in FIG. 5, when the width of the first discharge passage channel ① is 10 mm, the width of the second discharge passage channel ② is 9.5 mm, The width of the third discharge channel (③) is 9.0mm, the width of the fourth discharge channel (④) is 8.5mm, the width of the fifth discharge channel (⑤) is narrowed to 8.0mm, Again, the width of the sixth discharge passage channel (⑥) is 8.0mm, the width of the seventh discharge passage channel (⑦) is 8.5mm, the width of the eighth discharge passage channel (⑧) is 9.0mm, and the ninth discharge cylinder The width of the furnace channel (⑨) is 9.5 mm, and the width of the tenth discharge passage channel (⑩) is widened to 10 mm. In this embodiment, two divided discharge spaces are regarded as one discharge passage channel, and the width of one channel is presented, but the width of each divided discharge space can be proportionally changed as necessary.

6 is a surface light source lamp according to the present invention, in which the lighting method of the lamp is a hot-cold method. In this method, a hot electrode for applying power is formed on the right side, and the left electrode is grounded to form a cold. The front glass plate is stacked on the rear glass plate 21 to form a discharge space 22. The discharge space 22 includes a discharge passage channel 26 partitioned by a partition wall 23. The composition and action of the injected and the like is not different from the case of the hot cold (Hot-Cold-Hot) method. However, the width of the discharge passage channel is wider than the hot electrode, and the width of the discharge passage channel decreases proportionally as it moves away from the hot electrode.

If the widths of the discharge passage channels are the same as in the prior art, the brightness of the light is proportionally changed according to the distance from the hot electrode and the width of the discharge passage channels. Cold) the luminance curve of the surface light source lamp will be a straight downward line as shown in FIG. However, in the present invention described above, it is possible to adjust the discharge passage channel width proportionally so that the entire surface light source lamp can have substantially the same luminance evenly.

As an example, referring to the drawing of the surface light source lamp disclosed in FIG. 6, when the width of the first discharge passage channel ① is 10 mm, the width of the second discharge passage channel ② is 9.5 mm, The width of the third discharge channel (③) is 9.0mm, the width of the fourth discharge channel (④) is 8.5mm, the width of the fifth discharge channel (⑤) is narrowed to 8.0mm, Again, the width of the sixth discharge passage channel (⑥) is 7.5mm, the width of the seventh discharge passage channel (⑦) is 7.0mm, the width of the eighth discharge passage channel (⑧) is 6.5mm, and the ninth discharge cylinder The width of the furnace channel (⑨) is 6.0 mm, and the width of the tenth discharge passage channel (5.5) is continuously narrowed to 5.5 mm. In this embodiment, two divided discharge spaces are regarded as one discharge passage channel, and the width of one channel is presented, but the width of each divided discharge space can be proportionally changed as necessary.

As described above, according to the present invention, by realizing a surface light source lamp having high luminance and high efficiency and stable light emission characteristics to have a uniform luminance distribution, it maximizes the advantages of the liquid crystal display as a display device covering a large area, It is possible to drastically improve luminance non-uniformity, light utilization efficiency, power consumption, and the like, which are problems of the backlight.

In addition, the surface light source lamp of uniform brightness according to the present invention can be applied to a variety of fields that require a flat light source of a large area, as well as for the backlight of the LCD.

1 is a plan view showing a rear glass plate of a surface light source lamp of a hot-cold hot method according to the prior art.

FIG. 2 is a cross-sectional view taken along line a-a 'in FIG. 1.

FIG. 3 is a detailed view of portion B of FIG. 2.

4 is a plan view of the rear glass plate of the hot-cold type surface light source lamp according to the prior art.

5 is a plan view of a surface light source lamp of a hot-cold hot type assembled according to an embodiment of the present invention.

6 is a plan view of a hot-cold surface light source lamp assembled according to an embodiment of the present invention.

7 is a luminance graph of lighting methods of a surface light source lamp according to the related art.

8 is a graph comparing the luminance change of the surface light source lamp according to the present invention and the lamp of the prior art.

** Explanation of Signs of Major Parts of Drawings **

1, 11, 21: molded glass plate (back glass plate) 2, 12, 22: discharge space 3, 13, 23: partition wall

5, 15, 25: vacuum holes 6, 16, 26: discharge passage channels 7, 17, 27: internal electrodes

Claims (4)

In a fluorescent lamp in which a continuous zigzag-shaped sealed discharge space is divided into a discharge passage channel by a partition wall and at least one electrode is provided therein, A surface light source lamp, characterized in that the width of the discharge passage channel is formed narrower away from the hot electrode. The method of claim 1, The discharge passage channel width is changed according to the size of the surface light source lamp, the characteristics and intensity of the power source, the distance from the electrode. The method of claim 1, In the case of the surface light source lamp of which the lighting method is a hot-cold-hot method, the surface light source lamp is characterized in that the discharge passage channel width becomes narrower from both sides where the hot electrode is installed toward the center. . The method of claim 1, In the case of a hot-cold surface light source lamp, a surface light source lamp characterized in that the discharge passage channel width is narrowed from one side where the hot electrode is installed to the other side.