KR100804157B1 - Flat Panel Fluorescent Lamp Divided by Barrier Rib - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat fluorescent lamp used in a backlight for a large area liquid crystal display in a flat fluorescent lamp having a partition structure between an upper plate and a lower plate.

In the conventional flat fluorescent lamp, the partition wall is installed only in the horizontal direction, and the partition wall has a method of collectively driving electrodes by installing the electrodes in the longitudinal direction of the partition wall in order to function as a discharge passage.

The present invention is characterized by dividing the region by the partition wall of the large-area flat fluorescent lamp by adding the partition wall in the vertical direction in addition to the partition wall in the horizontal direction. The large area flat lamp is divided into a plurality of regions by the partition walls in the horizontal direction and the vertical direction, and a plurality of external electrodes are installed on the upper plate and the lower plate for each divided area and driven.

According to the above configuration, the flat fluorescent lamp for backlight of the liquid crystal display according to the present invention has the effect of adjusting the luminance for each region according to the brightness of the liquid crystal display screen image.

Flat Fluorescent Lamps, Bulkheads, Dimming, Liquid Crystal Displays, Backlights, Inverters

Description

Flat Panel Fluorescent Lamp Divided by Barrier Rib}

1A is a perspective view showing a first embodiment of a flat fluorescent lamp having a bidirectional bulkhead structure according to the present invention;

1B is a cross-sectional view taken along the X-Y direction of FIG. 1A.

1C is a plan view illustrating the electrode structure of the lower plate of FIG. 1A.

1D is a plan view showing an electrode structure of the upper plate of FIG. 1A.

2 is a perspective view showing a second embodiment of a flat fluorescent lamp having a bidirectional bulkhead structure according to the present invention;

3A is a perspective view showing a third embodiment of a flat fluorescent lamp having a bidirectional bulkhead structure according to the present invention;

3B is a cross-sectional view in the X-Y direction of FIG. 3A.

3C is a plan view illustrating the electrode structure of the lower plate of FIG. 3A.

Description of the main parts of the drawing

10: lower glass 11: upper glass

20: horizontal bulkhead 21: vertical bulkhead

31, 31 ': external electrode at both ends 32: external interruption electrode

40: fluorescent layer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to flat fluorescent lamps for backlights of liquid crystal displays, and to flat fluorescent lamps for effective driving of large screen flat fluorescent lamps. In the conventional flat fluorescent lamp, a partition wall in a horizontal direction is provided between an upper plate and a lower plate, and the partition wall serves as a support for the upper and lower plates and functions as a discharge passage. The partition wall is manufactured in various ways such as processing a glass material, casting, or firing a ceramic material. In addition, in the flat plate lamp, external electrodes are provided at both ends in the longitudinal direction of the partition wall, and an alternating current is applied to the external electrodes at both ends to generate a plasma in the discharge path between the partition walls.

However, in the conventional flat lamp as described above, as the area of the screen is wider, the discharge passage is longer, so that the driving voltage is increased and it is difficult to effectively drive the flat lamp. Recently, liquid crystal displays have been applied to TVs from notebook computers to monitors, so that the driving voltage of fluorescent lamps on small screens such as monitors is about 1 kV, while the driving voltages across 42-inch flat fluorescent lamps exceed 2 kV. . In addition, a power consumption of 30 inches is 100W, 42 inches need a large power of 200W or more. Therefore, the inverter for driving the large-screen flat fluorescent lamp has difficulty in high power control.

In general, an increase in the discharge voltage of the fluorescent lamp not only causes low efficiency, but also causes many limitations in the driving method. As a result, high discharge voltage makes it difficult to realize high brightness and high efficiency.

The present invention is to solve the above problems, in the large-area flat-panel fluorescent lamp to add a partition in the vertical direction in addition to the partition in the horizontal direction, the large area flat lamp by the horizontal and vertical partitions a plurality of areas By dividing into two parts and installing and driving a plurality of external electrodes on each of the upper and lower plates according to the divided regions, the large area that can adjust the luminance for each region according to the brightness of the liquid crystal display screen image by the low voltage driving and the driving method for each region. It is an object to provide a flat fluorescent lamp.

In order to achieve the above object, the flat fluorescent lamp according to the present invention is to install a horizontal partition wall for inducing discharge and a vertical partition wall for dividing the area to divide the area by the partition of the large-area flat fluorescent lamp. It is characterized by. In addition, the large area flat lamp can be divided into a plurality of areas by the partition walls in the horizontal direction and the vertical direction, and electrodes can be individually driven by installing the electrodes on the outside of the flat plate for each of the divided areas. And dimming.

Hereinafter, the partition structure according to the present invention will be described in detail with reference to the accompanying drawings, a flat fluorescent lamp and a driving method.

1A is a perspective view showing a first embodiment of a flat fluorescent lamp having a partition structure according to the present invention, in which a plurality of partitions installed in the horizontal direction and a partition wall in the center of the plate in the vertical direction are added to form a vertical wall by the central partition; Represents a flat lamp driving divided into two regions in the direction. The flat fluorescent lamp includes a bottom glass 10 and a top glass 11 disposed at a position opposite to the bottom glass 10, and seals each edge of the top glass 11 and the bottom glass 10 to form a flat fluorescent lamp. do. The lower glass 10 is provided with a plurality of horizontal bulkheads 20 in the longitudinal direction of the flat fluorescent lamp. The horizontal bulkhead 20 in such a horizontal direction supports a load supporting the load of the upper glass 11. At the same time, a separate discharge space or discharge passage is formed between each partition wall 20.

The present invention is characterized in that the vertical partition 21 in the vertical direction in addition to the partition 20 in the horizontal direction is further provided. The vertical partition wall 21 serves to divide the large area flat lamp of the present invention by area. In addition, the fluorescent lamp 40 is coated on the lower glass 10, the upper glass 11 and the partition wall 20, and the flat fluorescent lamp is filled with a discharge gas in the discharge space and sealed, using mercury or mercury-free lamps. It can be produced as. The pressure of the internal gas of the flat fluorescent lamp of the present invention is easily at a high pressure of several 100 Torr at a low pressure of several 10 Torr.

FIG. 1B is a cross-sectional view in the XY direction showing a structure in which driving power is applied to the flat fluorescent lamp of FIG. 1A. As shown in FIG. 1B, the cross section in the longitudinal direction of the flat fluorescent lamp includes a top glass 11 and a bottom glass ( 10) and the rectangular shape formed by the horizontal partition wall 20 and the vertical partition wall 21 is divided into two regions by the central vertical partition wall 21. Both ends of the electrodes 31 and 31 'are respectively provided at both ends of the lower plate of each region divided by the vertical partition walls, and the middle electrode 32 is provided in the middle thereof. In addition, upper electrodes 33 and 33 'are provided at both ends of the upper panel so as to correspond to both electrodes of the lower panel, respectively. In this case, the stop electrode 32 and the upper electrode 33, 33 ′ may not be installed according to various embodiments of the present disclosure.

In addition, in the case of installing the upper electrode, it is preferable to apply a conductive material along the partition wall or to be a transparent electrode in order to minimize interference of light emission. In addition, an alternating current voltage is applied to both ends 31 and 31 과 and 33 and 33 의 of the lower plate and the upper plate so as to be symmetrical with respect to the center vertical partition wall 21, and the stopping electrode 32 of the lower plate is installed. Can apply ground, floating, or a specific voltage.

The material of the partitions 20 and 21 may be both an insulating material and a conductive material. The insulating material is mainly formed by firing a ceramic material (PDP partition formation method), directly processing a glass plate, or manufacturing a glass material by casting method. The conductive material is preferably formed of a metal material, for example, a lightweight and workable aluminum material by milling or injection and casting by a mold. Alternatively, the metal powder (mainly Ag-powder) may be manufactured in a liquid phase and formed by a coating method, which uses Ag-paste used for forming an electrode of PDP. Particularly, the conductive material partition wall may be further coated with a dielectric layer, and the dielectric layer may include lead oxide (PbO), which is a dielectric material after formation of the PDP electrode. In the case of aluminum as the metal material, an alumite (Al 2 O 3) layer can be formed. The alumite layer mainly adopts anodization.

1C is a plan view illustrating the electrode structure of the lower plate of FIG. 1A. As shown, it is divided into two regions by the vertical bulkhead 21 at the middle in the horizontal direction, and divided into a plurality of the horizontal bulkheads 20 by the border in the vertical direction, and in the drawing, the two are bundled for the entire 10 discharge paths. It is shown divided into five areas.

1D is a plan view illustrating the electrode structure of the upper plate of FIG. 1A. As described above, in order to prevent blocking of light by the electrodes of the upper plate, an electrode is installed on the horizontal partition wall 20.

The driving of the flat fluorescent lamp according to FIGS. 1A to 1D as described above may employ various methods, and the following describes a representative embodiment of the present invention.

First, the entire plate is driven by one inverter system and does not consider scanning or dimming for each area. It is a method of applying voltages having different polarities by tying the electrodes 31 and 31 'between the upper and lower plates, respectively. . Such a driving method is used for a flat lamp that does not need to adjust the luminance of each region, and since the power supply structure is not complicated, there is an effect that the manufacturing cost can be lowered.

Second, the scanning method is driven for the electrodes separated in the vertical direction. This method is to drive each discharge path in the vertical direction in synchronization with the scanning of the area corresponding to the liquid crystal display, and has the effect of lowering the driving voltage by partitioning and driving a large area flat lamp in the vertical direction. .

Third, dimming is performed according to the brightness of the LCD screen for each of the vertical and horizontal regions. In this method, the partition area is made smaller than the above methods, and the large area flat lamp can be efficiently driven by driving by low driving voltage and adjusting luminance by dimming for each area.

As described above, since the flat fluorescent lamp of the present invention can be divided into a horizontal partition wall 20 and a vertical partition wall 21, the discharge voltage can be lowered and scanning or dimming for each area can be performed. For example, in the case of a 42-inch flat fluorescent lamp, when there is no vertical partition wall 21, a voltage of 2 kV or more at both ends is applied to the external electrodes provided at both ends of the flat plate. However, in the present invention, by installing the vertical partition wall 21, the voltage at both ends of each region is lowered to 1.5 kV, and at the same time, power consumption can be reduced by 30% or more by applying individual scanning and dimming.

2 is a perspective view showing a second embodiment of a flat fluorescent lamp having a bidirectional bulkhead structure according to the present invention, wherein the vertical bulkhead 21 is shifted by a predetermined length from the center to the horizontal direction. When the vertical bulkhead 21 is installed in a straight line in the vertical direction as shown in FIG. 1A, the non-light emitting part by the bulkhead of the center part appears clearly. This is not a problem at the outer edge of the flat plate lamp, but at the center divided by the partition wall, it becomes a discontinuous point of brightness. It has the effect of dispersing. In FIG. 2, the shape and arrangement of the electrodes are the same as those of the first embodiment of FIGS. 1A to 1D, and thus a detailed description thereof will be omitted.

3A to 3C show a third embodiment of a flat fluorescent lamp having a bidirectional bulkhead structure according to the present invention, wherein the flat fluorescent lamp having two vertical bulkheads 21 installed by dividing the flat lamp in three horizontal directions. It is a lamp. 3A is a perspective view of a flat lamp divided into three regions by a plurality of partition walls and a vertical partition wall 21 installed in a horizontal direction. This embodiment is not shown in other forms, but as shown in FIG. 2, the vertical bulkheads 21 may be disposed to be offset.

FIG. 3B illustrates a cross section in the X-Y direction showing a structure in which driving power is applied to the flat fluorescent lamp of FIG. 3A, which is divided into three regions by the vertical partition wall 21. Opposite electrodes 31 and 31 ′ and interruption electrodes 32 are provided at both ends of the lower plate of each region divided by three vertical partition walls, and upper and lower electrodes 33 and 33 ′ are provided on both ends of the lower plate. It is installed to correspond. The alternating voltages are applied to the lower electrodes and the upper electrodes at both ends 31 and 31 s and 33 and 33 s so as to be symmetrical with respect to the vertical partition walls, but the voltages are applied to neighboring electrodes with the same polarity. The lower electrode 32 may not be installed, and when installed, grounding, coating, or a specific voltage may be applied.

3C is a plan view illustrating the electrode structure of the lower plate of FIG. 3A. The middle partition is divided into three regions by the vertical partition wall 21 in the middle direction, and the horizontal partition wall 20 is divided into a plurality of sections in the vertical direction. 3C is an example divided into two regions in the longitudinal direction.

Since the driving method of the second and third embodiments of the present invention as described above is the same as the driving method of FIGS. 1A to 1D, detailed description thereof will be omitted.

According to the above configuration, the flat fluorescent lamp for backlight of the liquid crystal display according to the present invention is driven by dividing a large area by area, thereby lowering driving voltage and realizing dimming for each area, thereby reducing power consumption to about half of the conventional art. In addition, the luminance can be adjusted for each region according to the brightness of the LCD display image.

Claims (10)

delete A flat fluorescent lamp comprising a lower plate glass, an upper plate glass disposed at a position facing the lower plate glass, and a discharge space formed as a partition between the lower plate glass and the upper plate glass. The partition wall of the lower plate glass is divided into a plurality of regions by installing a vertical partition and a horizontal partition wall, a plurality of electrodes on the upper plate and the lower plate of each region to apply an alternating current voltage. The method of claim 2, wherein the vertical partition wall, And dividing the lower plate glass into at least two, wherein the vertical partitions are formed on the same straight line. The method of claim 2, wherein the vertical partition wall, The lower plate glass is divided into at least two, the flat partition lamp characterized in that the vertical partition wall is formed so as to be shifted. The lower plate glass of claim 2, A flat fluorescent lamp comprising an electrode formed therein. The lower plate glass of claim 2, A flat fluorescent lamp, characterized in that an electrode is formed on the outside thereof. The method of claim 2, wherein the electrode, Flat panel fluorescent lamps are installed for each area divided by the vertical partition wall, and driven for each area. The method of claim 2, wherein the flat fluorescent lamp, A flat fluorescent lamp characterized in that a single inverter system is driven by grouping electrodes of the same polarity together. The method of claim 2, wherein the flat fluorescent lamp, And a flat fluorescent lamp driven in a scanning manner in synchronization with the scanning of the liquid crystal screen for each region corresponding to the partitioned liquid crystal screen. The method of claim 2, wherein the flat fluorescent lamp, And a flat dimming method according to the brightness of the liquid crystal display for each region corresponding to the partitioned liquid crystal display.

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