KR20060136286A - Flat fluorescent lamp - Google Patents

Abstract

The present invention relates to a flat plate fluorescent lamp for a backlight, the flat plate fluorescent lamp according to the present invention, the first and second flat plates facing each other; A first main electrode formed at one end of the first and second flat plates; A second main electrode formed at the other ends of the first and second flat plates; At least one first and second auxiliary electrodes independently formed between the first and second main electrodes; And at least one resistor connecting between the first main electrode and the first auxiliary electrode and connecting between the second main electrode and the second auxiliary electrode, and between the first and second auxiliary electrodes. The distance is shorter than the distance between the first and second main electrodes.

Flat fluorescent lamp, main electrode, auxiliary electrode, resistance, discharge start voltage, liquid crystal display module

Description

Flat Fluorescent Lamps {FLAT FLUORESCENT LAMP}

1A is a perspective view showing the configuration of a flat fluorescent lamp according to a first embodiment of the present invention.

1B is a plan view showing a second flat plate of the flat fluorescent lamp according to the first embodiment of the present invention;

2A is a plan view showing a second flat plate of the flat fluorescent lamp according to the second embodiment of the present invention;

*** Explanation of major symbols in drawings ***

100a: first flat plate 100b: second flat plate

103: sealing material 105: spacer

110, 210: first main electrode 120, 220: second main electrode

110 ', 210': first auxiliary electrode 120 ', 220': second auxiliary electrode

130: resistance

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to fluorescent lamps, and more particularly, to flat fluorescent lamps for backlights.

In general, a flat panel display may be classified into a light emitting flat panel display and a light receiving flat panel display. A flat panel display includes a flat cathode ray tube, a plasma display panel, an electroluminescent device, and a fluorescent display. And light emitting diodes, and the like, and the light receiving type flat panel display includes a liquid crystal display module.

Since the liquid crystal display module itself does not emit light to form an image, a backlight unit is provided on a rear surface thereof to display an image even in a dark place.

The general requirements of the backlight unit for liquid crystal display module are high brightness, high efficiency, uniformity of brightness, long life, thin, low weight, low cost, and so on. The dragon backlight unit requires high brightness.

In general, the lamp used in the backlight unit of the liquid crystal display module is a straight tube-type tube fluorescent lamp. The tubular tubular lamp is formed into a cylindrical, plate-like, cylindrical, or the like, and an inner electrode or an outer electrode made of a transition metal such as nickel (Ni) is formed at both ends.

Surface emission required in the liquid crystal display module requires overall uniformity (85% or more) and luminance suitable for a display (8000 cd / m ² ). Therefore, in order to use a customs lamp in a liquid crystal display module, a prism, a diffusion plate, etc. which can convert a one-dimensional light source into a two-dimensional light source is required. However, even with the use of such an accessory device, sufficient uniformity and luminance of surface emission cannot be realized.

In order to improve the shortcomings of these tubular lamps, flat lamps have been proposed.

Conventional flat fluorescent lamps are formed using two sheets of flat glass. First, a discharge space is formed by consisting of a first plate and a second plate bonded to the first plate via a sealing material. A spacer for maintaining an internal discharge space is formed between the first and second plates. In addition, a dielectric layer is formed over the first flat plate, and a phosphor layer is formed over the dielectric plate and under the second flat plate. A discharge electrode is formed in the corner regions of the first and second plates, and a discharge gas made of xenon (Xe), neon (Ne), argon (Ar), and the like is filled in the discharge space.

In the conventional flat panel fluorescent lamp, as the power is applied to the discharge electrodes, the phosphor layers on the surfaces of the two substrates are excited by the ultraviolet rays generated by the discharge between the discharge electrodes to supply the surface light source to the liquid crystal display module.

However, since the conventional flat fluorescent lamp uses a mixed gas such as xenon or xenon and neon, not only the AC voltage applied to the discharge electrode is high but also the light efficiency is low as about 30 ml / W. In order to irradiate light, driving power must be increased, so power consumption increases and heat is a problem. In addition, since the xenon gas used as the discharge gas emits ultraviolet rays of 147 nm to 173 nm, there is a problem that an expensive phosphor should be used.

In particular, when the discharge electrode is an external electrode, a higher discharge voltage is required than that of the internal electrode, and accordingly, the area of the external electrode needs to be wider or longer, so that the luminance tends to decrease at both ends of the electrode. Problems have occurred in terms of.

Accordingly, in order to solve the above problems, the present invention improves the structure of the discharge electrode to lower the discharge start voltage, and to provide a flat panel fluorescent lamp for backlight and a liquid crystal display module using the same that can implement high brightness and high efficiency. There is a purpose.

Other objects and features of the present invention will be described in the configuration and claims of the invention described below.

Accordingly, in order to achieve the above object, a flat plate fluorescent lamp according to the present invention, the first and second flat plates facing each other; A first main electrode formed at one end of the first and second flat plates; A second main electrode formed at the other ends of the first and second flat plates; At least one first and second auxiliary electrodes independently formed between the first and second main electrodes; And at least one resistor connecting between the first main electrode and the first auxiliary electrode and connecting between the second main electrode and the second auxiliary electrode, and between the first and second auxiliary electrodes. The distance is shorter than the distance between the first and second main electrodes.

The resistance may be connected between two or more of the first auxiliary electrodes, and the resistance may be connected between two or more of the second auxiliary electrodes.

The distance between the first main electrode and the first auxiliary electrode is smaller than the distance between the second main electrode and the first auxiliary electrode, and the distance between the second main electrode and the second auxiliary electrode is equal to the first main electrode. It is characterized in that it is formed smaller than the distance between the electrode and the first auxiliary electrode.

In addition, discharge is initiated from the first and second auxiliary electrodes having the closest distance among the at least one first auxiliary electrode and the at least one second auxiliary electrode, and the discharge is sequentially performed toward the first and second main electrodes. Characterized in that made.

In this case, the resistance is characterized in that after the start of the discharge of the first and second auxiliary electrode, the discharge is switched to the first and second main electrode, thereby lowering the discharge start voltage.

The first and second main electrodes are formed to have a larger area than the first and second auxiliary electrodes, and the first and second auxiliary electrodes reduce the area of the first and second main electrodes. The effective light emitting area of the first and second flat plates is increased.

The first auxiliary electrode disposed closer to the first main electrode among the at least one first auxiliary electrode is formed to have a larger area, and is disposed closer to the second main electrode among the at least one second auxiliary electrode. The second auxiliary electrode may be formed to have a larger area.

In addition, the first and second main electrodes and the first and second auxiliary electrodes may have a stripe shape.

 In addition, the first and second main electrodes and the first and second auxiliary electrodes may be formed on outer surfaces of the first and second flat plates, and the first and second auxiliary electrodes may be formed on the second flat plate. Can be.

The flat fluorescent lamp of the present invention may include: a sealing member formed along edge regions of the first and second flat plates and sealing the inside of the first and second flat plates; At least one spacer for maintaining a discharge space in the first and second flat plates; And a phosphor layer and a dielectric layer applied to the surfaces of the first and second flat plates.

In addition, the liquid crystal display module according to the present invention, the liquid crystal display panel; A flat panel fluorescent lamp disposed on a rear surface of the liquid crystal display panel and configured to irradiate light to the liquid crystal display panel, wherein the flat panel fluorescent lamp comprises: first and second flat plates facing each other; A first main electrode formed at one end of the first and second flat plates; A second main electrode formed at the other ends of the first and second flat plates; At least one first and second auxiliary electrodes independently formed between the first and second main electrodes; And at least one resistor connecting between the first main electrode and the first auxiliary electrode and connecting between the second main electrode and the second auxiliary electrode, and between the first and second auxiliary electrodes. The distance is shorter than the distance between the first and second main electrodes.

Hereinafter, a flat panel fluorescent lamp and a liquid crystal display module using the same according to the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B are respectively a perspective view showing the configuration of a flat fluorescent lamp according to a first embodiment of the present invention and a plan view showing a second flat plate in the flat fluorescent lamp according to the first embodiment of the present invention.

First, as shown in FIG. 1A, a flat plate fluorescent lamp according to the present invention is formed of a transparent material such as glass and faces each other with the first flat plate 100a and the second flat plate 100b, and the first and second plates. The sealing member 103 is formed along the edge regions of the second flat plates 100a and 100b, and seals the interior of the first and second flat plates 100a and 100b, and the first and second flat plates 100a and 100b. At least one spacer 105 for maintaining a discharge space in the interior, and a phosphor layer (not shown) and a dielectric layer (not shown) that is thinly applied to the surfaces of the first and second flat plates (100a, 100b) It is configured by.

In addition, a plurality of main electrodes 110 and 120 having a stripe shape and auxiliary electrodes 110 'and 120' are formed at both ends of the first and second flat plates 100a and 100b to reduce a discharge start voltage. . In other words, a first main electrode 110 is formed at one end of the first and second flat plates 100a and 100b, and a second main electrode 120 discharged together with the first main electrode 110 is formed. It is formed in the other end part of the 1st and 2nd flat plates 100a and 100b. In addition, at least one first and second auxiliary electrodes 110 ′ and 120 ′ are independently formed between the first and second main electrodes 110 and 120, respectively. In this case, the distance between the first and second auxiliary electrodes 110 ′ and 120 ′ is shorter than the distance between the first and second main electrodes 110 and 120, and the first main electrode 110 is also shorter than the distance between the first and second auxiliary electrodes 110 ′ and 120 ′. ) Is shorter than the distance between the second main electrode 120 and the first auxiliary electrode 110 ', and the second main electrode 120 and the second auxiliary electrode 110' are shorter than each other. The distance between the electrode 120 'is shorter than the distance between the first main electrode 110 and the first auxiliary electrode 110'.

Substantially, the first and second main electrodes 110 and 120 formed at both ends of the planar fluorescent lamp have a stripe shape having a predetermined width. Typically, the first and second main electrodes 110 and 120 have a stripe shape. When the area becomes wider, the distance between the first and second main electrodes 110 and 120 becomes relatively short, and the discharge start voltage is lowered. However, when the areas of the first and second main electrodes 110 and 120 are wide, there is a problem that the edge width of the backlight is increased and the non-light emitting area is widened, and thus, the first and second main electrodes 110 and 120 are used. There is a limit to widening the area of.

Therefore, in the present invention, the widths of the first and second main electrodes 110 and 120 are formed within the range of the edge width of the limited backlight, and then the first and second auxiliary electrodes 110 'and 120' are secondly formed. By further forming on the bottom outer surface of the flat plate 100a, the area of the first and second main electrodes 110 and 120 is minimized, and light is emitted to the top of the flat plate fluorescent lamp so that the first and second flat plates ( The effective light emitting area of 100a and 100b is increased. In addition, since the distance between the electrodes discharged at the same power through the first and second auxiliary electrodes 110 ′ and 120 ′ can be shortened, the discharge start voltage is lowered.

That is, the secondary discharge is caused between the first and second main electrodes 110 and 120 to induce a discharge between the first and second main electrodes 110 and 120. The auxiliary discharge is performed at a voltage much lower than that of the first and second main electrodes 110 and 120 positioned at both ends of the planar fluorescent lamp, and the first discharge is formed in advance in the internal discharge space of the planar fluorescent lamp. And induces a discharge between the second main electrodes 110 and 120 and lowers the discharge voltage.

However, when the first and second auxiliary electrodes 110 'and 120' are formed in this manner, the area occupancy problem and luminance problem of the non-light emitting area of the flat fluorescent lamp can be solved and the discharge start voltage can be lowered. After the discharge starts at the first and second auxiliary electrodes 110 ′ and 120 ′, when the first and second main electrodes 110 and 120 are not sequentially discharged, the first and second main electrodes ( 110, 120) there is a problem that the efficiency of the kitchen can be lowered relative.

Therefore, the present invention solves the above problems by forming a resistance between the main electrode and the auxiliary electrode, as shown in FIG.

As shown in the figure, in the planar fluorescent lamp according to the present invention, between the first main electrode 110 and the first auxiliary electrode 110 'and between the plurality of first auxiliary electrodes 110' to realize high brightness and high efficiency. At least one resistor 130 that connects each other) is formed. In addition, at least one resistor 130 is formed between the second main electrode 120 and the second auxiliary electrode 120 'and between the plurality of second auxiliary electrodes 120'.

The resistor 130 is formed between the first main electrode 110 and the first auxiliary electrode 110 'and the second main electrode 120 and the second auxiliary electrode 120'. The first auxiliary electrode 110 ′ and the second auxiliary electrode 120 ′ only start discharge and are turned off, thereby improving the efficiency of the flat fluorescent lamp.

That is, the first and second auxiliary electrodes 110 ′ and 120 ′ only start discharging, and the discharging is performed on the first and second main electrodes 110 and 120, thereby lowering the discharge start voltage. The efficiency of the flat fluorescent lamp can be improved.

In this case, the discharge start is performed at the first and second auxiliary electrodes 110 ′ and 120 ′ having the closest distance between the at least one first auxiliary electrode 110 ′ and the at least one second auxiliary electrode 120 ′. The discharge is sequentially performed in the directions of the first and second main electrodes 110 and 120. In other words, after the discharge is started at the first and second auxiliary electrodes 110 ′ and 120 ′ which are located closest to each other, the next first and second auxiliary electrodes 110 ′ and 120 ′ are formed by the resistor. The discharge is switched to, and finally, the discharging occurs at the first and second main electrodes 110 and 120.

As a result, the initial discharge is performed through the first and second auxiliary electrodes 110 ′ and 120 ′, and the discharging is performed through the first and second main electrodes 110 and 120. Through the implementation of a low discharge start voltage, the area of the first and second main electrodes 110 and 120 may be reduced, the pressure of the discharge gas may be increased, or the size of the flat fluorescent lamp may be increased.

For reference, the discharge has an edge effect (discharge) is started from the electrode located in the front, when the charge (charge) there, the discharge proceeds to the electrode located behind. However, the edge effect may cause a case in which the electrode disposed behind fails to serve. In the present invention, by forming a resistance between the electrodes, the electrode in front is used only for initial discharge and is turned off.

Meanwhile, in order to implement a lamp having a high brightness, the pressure of the discharge gas also plays a very important factor. In the flat fluorescent lamp according to the present invention, high-pressure discharge gas injection for realizing high brightness is possible. In practice, high luminance can be realized only when a large amount of gas is excited in the lamp. However, if the pressure of the discharge gas is too high, there is a problem that the discharge is difficult to be made, there is a limit to the use of the discharge gas. However, when the resistance is formed between the main electrode and the auxiliary electrode as in the present invention, the discharge start voltage is lowered to further inject the discharge gas, thereby making it possible to make a flat fluorescent lamp having high brightness.

Meanwhile, the area of the first and second auxiliary electrodes 110 ′ and 120 ′ of the present invention is preferably smaller than the first and second main electrodes 110 and 120. That is, when the area of the first and second auxiliary electrodes 110 ′ and 120 ′ is widened, the intensity of the discharge generated by the first and second auxiliary electrodes 110 ′ and 120 ′ is increased, thereby increasing the first and second auxiliary electrodes 110 ′ and 120 ′. The discharge between the second main electrodes 110 and 120 is relatively weak, causing a problem that the uniformity of luminance of the flat fluorescent lamp is lowered. Therefore, an area of the first and second auxiliary electrodes 110 ′ and 120 ′ may be sufficient to cause an auxiliary discharge so as to easily induce a discharge between the first and second main electrodes 110 and 120.

2A is a plan view showing a planar fluorescent lamp according to a second embodiment of the present invention. Since the configuration of this embodiment is similar to that of the first embodiment, only the differences will be described.

As shown in the figure, the first auxiliary electrode 210 'disposed closer to the first main electrode 210 among the at least one first auxiliary electrode 210' has a larger area. The second auxiliary electrode 220 ′ disposed closer to the second main electrode 220 among the at least one second auxiliary electrode 220 ′ is formed to have a larger area.

This is to maximize the edge effect of the discharge, the electrode closer to the first and second main electrode 210 220 is increased the line width of the electrode to increase the efficiency of the discharge.

As a result, the present invention has the effect of lowering the discharge start voltage and power consumption of the flat panel fluorescent lamp, improving the light efficiency, and obtaining a uniform discharge.

Hereinafter, a liquid crystal display module employing the flat panel fluorescent lamp for backlight of the present invention as described above will be described.

The LCD includes a liquid crystal display panel in which pixels are arranged in a matrix form, a gate driving circuit unit and a data driver connected to a side surface of the liquid crystal display panel, and a backlight unit disposed on a rear surface of the liquid crystal display panel.

In this case, the liquid crystal display panel includes an array substrate and a color filter substrate bonded together so as to maintain a uniform cell gap, and a liquid crystal layer formed between the array substrate and the color filter substrate.

In addition, a common electrode and a pixel electrode are formed on the liquid crystal display panel where the array substrate and the color filter substrate are bonded to each other to apply an electric field to the liquid crystal layer, and to apply the data to the pixel electrode while a voltage is applied to the common electrode. When the voltage of the signal is controlled, the liquid crystal of the liquid crystal layer rotates by dielectric anisotropy according to the electric field between the common electrode and the pixel electrode to transmit or block light for each pixel to display characters or images.

In this case, in order to control the voltage of the data signal applied to the pixel electrode for each pixel, a switching element such as a thin film transistor (TFT) is individually provided in the pixels.

Meanwhile, the gate driving circuit unit and the data driving circuit unit are combined with the liquid crystal display panel in various forms to supply scan signals and image information to a plurality of gate lines and data lines formed in the liquid crystal display panel, thereby providing pixels of the liquid crystal display panel. Drive it.

Meanwhile, the flat panel fluorescent lamp of the present invention is employed as the light source in the backlight unit. Unlike the conventional capillary lamp, the flat fluorescent lamp is disposed on the rear surface of the liquid crystal display panel, and is a surface light source as the liquid crystal display panel. Will be supplied.

In addition, the planar fluorescent lamp of the present invention directly generates a surface light source, and thus, does not require an auxiliary device such as a light guide plate, and supplies light having a uniform brightness even without a separate optical sheet.

Many details are set forth in the foregoing description but should be construed as illustrative of preferred embodiments rather than to limit the scope of the invention. Therefore, the invention should not be defined by the described embodiments, but should be defined by the claims and their equivalents.

As described above, the present invention forms a plurality of stripe auxiliary electrodes between the main electrodes formed at both ends of the planar fluorescent lamp, thereby minimizing the area of the main electrode and improving luminance in the corner region of the planar fluorescent lamp. This provides the effect of maintaining the uniformity of luminance over the entire area of the lamp.

In addition, by forming a resistance between the plurality of auxiliary electrodes and between the auxiliary electrode and the main electrode, it is possible to lower the discharge start voltage and power consumption, improve the light efficiency, and obtain a uniform discharge.

Claims (17)

First and second plates facing each other; A first main electrode formed at one end of the first and second flat plates; A second main electrode formed at the other ends of the first and second flat plates; At least one first and second auxiliary electrodes independently formed between the first and second main electrodes; And And at least one resistor connecting the first main electrode and the first auxiliary electrode and connecting the second main electrode and the second auxiliary electrode, wherein a distance between the first and second auxiliary electrodes is And a shorter distance than the distance between the first and second main electrodes. The flat fluorescent lamp of claim 1, wherein the resistor connects two or more of the first auxiliary electrodes. The flat fluorescent lamp of claim 1, wherein the resistor connects two or more of the second auxiliary electrodes. The flat fluorescent lamp of claim 1, wherein a distance between the first main electrode and the first auxiliary electrode is smaller than a distance between the second main electrode and the first auxiliary electrode. The flat fluorescent lamp of claim 1, wherein a distance between the second main electrode and the second auxiliary electrode is smaller than a distance between the first main electrode and the first auxiliary electrode. The method of claim 1, wherein discharge is initiated from the first and second auxiliary electrodes having the closest distance among the at least one first auxiliary electrode and the at least one second auxiliary electrode, and toward the first and second main electrodes. Flat fluorescent lamp characterized in that the discharge is made sequentially. The flat panel fluorescent lamp of claim 1, wherein the resistor switches discharge to the first and second main electrodes after the start of discharge of the first and second auxiliary electrodes, thereby lowering a discharge start voltage. The flat panel fluorescent lamp of claim 1, wherein the first and second main electrodes have a larger area than the first and second auxiliary electrodes. The flat fluorescent lamp of claim 1, wherein the first and second auxiliary electrodes reduce the area of the first and second main electrodes, thereby increasing the effective light emitting area of the first and second flat plates. . 10. The flat fluorescent lamp of claim 9, wherein the first auxiliary electrode disposed closer to the first main electrode among the at least one first auxiliary electrode is formed to have a larger area. 10. The flat fluorescent lamp of claim 9, wherein the second auxiliary electrode disposed closer to the second main electrode among the at least one second auxiliary electrode is formed to have a larger area. The flat panel fluorescent lamp of claim 1, wherein the first and second main electrodes have a stripe shape. The flat panel fluorescent lamp of claim 1, wherein the first and second auxiliary electrodes have a stripe shape. The flat fluorescent lamp of claim 1, wherein the first and second main electrodes are formed on outer surfaces of the first and second flat plates. The flat fluorescent lamp of claim 1, wherein the first and second auxiliary electrodes are formed on the second flat plate. The method of claim 1, A sealant formed along edge regions of the first and second plates, and sealing an interior of the first and second plates; At least one spacer for maintaining a discharge space in the first and second flat plates; And And a phosphor layer and a dielectric layer applied to the surfaces of the first and second flat plates. A liquid crystal display panel; And Is disposed on the rear surface of the liquid crystal display panel, and comprises a flat fluorescent lamp for irradiating light to the liquid crystal display panel, The flat plate fluorescent lamp, First and second plates facing each other; A first main electrode formed at one end of the first and second flat plates; A second main electrode formed at the other ends of the first and second flat plates; At least one first and second auxiliary electrodes independently formed between the first and second main electrodes; And And at least one resistor connecting the first main electrode and the first auxiliary electrode and connecting the second main electrode and the second auxiliary electrode, wherein a distance between the first and second auxiliary electrodes is And a shorter than a distance between the first and second main electrodes.

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