KR101000167B1 - Backlight unit using CCFL - Google Patents

Abstract

The present invention relates to a backlight device using an external electrode fluorescent lamp for improving the initial starting characteristics by activating the electrons of the external electrode fluorescent lamp by the light of the LED lamp, in the backlight device using an external electrode fluorescent lamp, the external A lamp guide bottom disposed at both sides of the cover bottom to support an electrode fluorescent lamp, and having a lamp seat at an upper side thereof; A common electrode formed by being inserted into the lamp mounting part and contacting the external electrode of the external electrode fluorescent lamp, and a line electrode electrically connecting the grip electrode from an inverter, and fastened to the lamp guide bottom; And an LED module disposed to be spaced apart from the common electrode and emitting light by a voltage induced from the common electrode.

Backlight, external electrode fluorescent lamp, initial light, dark, lighting delay

Description

Backlight unit using external electrode fluorescent lamp {Backlight unit using CCFL}

The present invention relates to a backlight device, and more particularly to a backlight device using an external electrode fluorescent lamp for activating the electrons of the external electrode fluorescent lamp by the light of the LED lamp to improve the initial starting characteristics.

Liquid crystal displays (hereinafter referred to as "LCDs") are widely used as flat panel displays because they can be driven using low power and have vivid color reproduction. However, unlike CRTs and PDPs, LCDs are non-light-emitting devices that do not emit light directly, and a backlight unit using a fluorescent lamp as a light source to irradiate light from the back of the LCD panel to the panel is separately provided. Required.

In particular, in recent years, flat panel displays such as LCDs are becoming larger in size, and various types of backlight devices have been developed to function as backlights for such large display devices.

In the fluorescent lamp installed in the backlight device, a discharge space is formed inside a cylindrical glass tube according to the shape of the lamp, and a discharge space is formed by laminating a tubular fluorescent lamp that emits light by forming a fluorescent layer on the inner surface thereof and a flat upper and lower glass substrate. It can be divided into a flat fluorescent lamp having a fluorescent layer formed on its inner surface. In addition, the tubular fluorescent lamp is classified into an internal electrode fluorescent lamp in which the electrode is built in the fluorescent lamp and an external electrode fluorescent lamp in which the electrode is installed outside according to the position of the electrode. In the external electrode fluorescent lamp, phosphors are generally applied to the inner wall of a tubular glass tube, discharge gas is filled in the inside thereof, and electrodes for generating an electric field are formed on the outer walls of both ends of the glass tube.

Looking at the backlight device using an external electrode fluorescent lamp according to the prior art with reference to Figure 1, the lamp guide bottom 20 is disposed on both side edges of the cover bottom 10, one side of the lamp guide bottom 20 The common electrode 30 is provided to apply power to the lamp, and the external electrode fluorescent lamp is fitted to the common electrode 30. In addition, although not shown, the cover bottom 10 includes an inverter for driving the lamp and a reflection sheet for reflecting the light of the lamp upwards, and an upper side of the fluorescent lamp for uniformly outputting the lamp light. Various optical sheets are laminated. The structure of the backlight device using the external electrode fluorescent lamp has been filed by the present applicant in the 10-2008-0107030.

The external electrode fluorescent lamp 40 is supplied with power by the grip electrode, so that an electric field is generated at the lamp electrodes at both ends of the glass tube. As a result, the ultraviolet rays emitted while the discharge gas ions inside the glass tube are excited and stabilized again are emitted. It collides with and emits light. However, when the external electrode fluorescent lamp is left in a dark state, for example, in an illuminance of 0.1 lux or less for a long time, the discharge gases inside the lamp become a ground state, and a predetermined time is required to reactivate them.

Therefore, when the backlight device using the external electrode fluorescent lamp is turned off and is left for a long time in a low temperature dark state or the discharge gas is in the ground state, the fluorescent lamp does not immediately turn on even when the power is applied, the lighting is delayed or even does not turn on. It does not happen. That is, when the backlight device is left for a long time in a low-temperature dark state, the discharge gas reaches the ground state, there is a problem that the initial light emission characteristics deteriorate in this state.

The backlight device using the external electrode fluorescent lamp according to the prior art has a problem that the initial lighting is delayed due to the characteristics of the fluorescent lamp when left in the dark state for a long time.

The present invention has been proposed in order to achieve the above object, by using a voltage induced from a high voltage electrode for supplying power to the fluorescent lamp on one side of the cover bottom is arranged a plurality of external electrode fluorescent lamps An object of the present invention is to provide a backlight device capable of emitting light and providing excitation to the discharge gas inside the fluorescent lamp by the light of the LED, thereby improving the initial light emission characteristics of the external electrode fluorescent lamp.

The present invention for achieving the above object is a backlight device using an external electrode fluorescent lamp, which is disposed on both sides of the inside of the cover bottom to support the external electrode fluorescent lamp, the lamp having a lamp seat on the upper side Guide bottom; A common electrode formed by being inserted into the lamp mounting part and contacting the external electrode of the external electrode fluorescent lamp, and a line electrode electrically connecting the grip electrode from an inverter, and fastened to the lamp guide bottom; And an LED module disposed to be spaced apart from the common electrode and emitting light by a voltage induced from the common electrode.

In the above-described configuration, the LED module includes a first electrode disposed at a distance from the line electrode of the common electrode, a second electrode contacted with the cover bottom and grounded, and an LED connected to the first electrode and the second electrode. Characterized in that consists of.

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In general, when the fluorescent lamp is to be turned on after being left in a low temperature dark state for a long time, a predetermined time is required to simply activate the electrons in the ground state through an external electrode, thereby causing an initial lighting delay.

However, according to the present invention having the above configuration, voltage is momentarily induced to the organic electrode disposed at a predetermined interval on the high-voltage line electrode for supplying power to the fluorescent lamp. At this time, the LED emits light by the voltage induced in the organic electrode, and the light of the LED can primarily activate the fluorescent lamp electrons in the ground state, thereby improving the initial lighting characteristic of the fluorescent lamp by the external electrode. You can.

The technical problem achieved by the present invention and the practice of the present invention will be apparent from the preferred embodiments described below. The following examples are merely illustrated to illustrate the present invention and are not intended to limit the scope of the present invention. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a partial perspective view illustrating a backlight device according to an embodiment of the present invention, FIG. 3 is a cross-sectional view illustrating the backlight device according to the embodiment of FIG. 2, and FIG. 4 is an LED module of the backlight device according to the embodiment of FIG. 2. Is a perspective view.

Referring to the drawings, in the backlight device according to the embodiment of the present invention, a lamp guide bottom 20 is disposed inside the cover bottom 10, and one side of the lamp guide bottom 20 has a common power for applying power to the lamp. An electrode 30 is provided, and a plurality of external electrode fluorescent lamps 40 for which external electrodes at both ends are inserted into the common electrode 30 are provided. In particular, in the embodiment of the present invention, a light emitting diode (hereinafter referred to as "LED") module 50 is provided to improve the initial light emission characteristics of the external electrode fluorescent lamp 40 at a predetermined position.

In the exemplary embodiment of the present invention, the backlight device using the external electrode fluorescent lamp has the same structure that is symmetrical with each other at both ends of the fluorescent lamp. Hereinafter, only one backlight device will be described and described. In addition, although not shown, a detailed description of a reflective sheet provided inside the cover bottom and various optical sheets for uniformly emitting light of a fluorescent lamp as a general configuration of a backlight device will be omitted.

In detail, the above-described cover bottom 10 constitutes a lower housing of the backlight device, in which a reflective sheet, a lamp guide bottom, an inverter, a printed circuit board, a fluorescent lamp, an LED module, and the like are seated thereon, and an upper side thereof. The optical sheets are laminated to. In addition, the cover bottom 10 is provided with a grounding (GND) function to prevent damage to the backlight device due to electrical characteristics.

The above-described lamp guide bottom 20 is installed on both sides of the cover bottom 10 to be mounted and fixed to the common electrode 30 and the external electrode fluorescent lamp 40, and is formed of an injection molded material of insulating material. On one side of the flat panel 22, a plurality of lamp seating portions 21 for mounting the grip electrode 31 and the fluorescent lamp external electrode 41 protrude upward, and the fluorescent lamp is pushed on the other side. A stopper 23 for preventing is formed.

The common electrode 30 is configured to apply a high voltage power from an inverter (not shown) in contact with the external electrode 41 of the fluorescent lamp, and is formed by being pressed by a press material with a conductive material made of metal. It is inserted into the lamp mounting portion 21 is provided with a grip electrode 31 for supplying power by contacting the external electrode 41 of the fluorescent lamp 40, the other side of the grip electrode 31 from the inverter ) Is provided with a line electrode 32 which is electrically connected to the grip electrode 31. That is, a plurality of grip electrodes 31 are integrally formed at predetermined intervals along the plate-shaped line electrode 32.

The above-described fluorescent lamp 40 is a light source of the backlight device, the external electrode fluorescent lamp is applied in the embodiment of the present invention. In addition, the fluorescent lamp 40 is fixed to the external electrode 41 at both ends by being fitted to the grip electrode 31 of the common electrode 30, and by the electrical contact between the external electrode 41 and the grip electrode 31. Power is supplied.

The above-described LED module 50 is configured to emit the LED 53 using the voltage induced from the line electrode 32 of the common electrode, and is arranged at a predetermined distance from the line electrode 32. A first organic electrode 51 and a second organic electrode 52 which is in contact with the cover bottom 10 and grounded are provided, and terminals are in contact with the first organic electrode 51 and the second organic electrode 52, respectively. And the LED 53 which emits light. Here, the first organic electrode 51 and the second organic electrode 52 are each made of a conductor made of metal.

Specifically, as shown in FIG. 3, one side of the first organic electrode 51 is disposed apart from the line electrode 32 of the common electrode 30 at a predetermined distance D1, and the other side of the first organic electrode 51 is disposed on the LED 53. Is connected, the second organic electrode 52 is arranged so that one side is in contact with the cover bottom 10 and the other side is connected to the LED 53, the LED 53 is not directly connected to the external power source . Here, the first organic electrode 51 is arranged parallel to the line electrode 32 and bent into the backlight device at a predetermined length L1 and extends in parallel with the fluorescent lamp 40 to be connected to the LED 53. The second organic electrode 52 is arranged to extend from the LED 53 to the cover bottom 10 below the lamp guide bottom 20.

In the LED module 50 having the above-described configuration, although the LED does not emit light in a low temperature dark state in which power is not supplied to the power supply unit, when a high voltage power is applied through the line electrode 32 to drive a backlight, The voltage is instantaneously induced to the first organic electrode 51 adjacent to the line electrode 32, and as a result, the current flows between the first organic electrode 51 and the second organic electrode 52. It will emit light. That is, although the LED 53 is not directly supplied with power from the outside, the LED 53 emits light by an indirect voltage induced from the high voltage of the common electrode 30.

On the other hand, the external electrode fluorescent lamp 40 is left in a low temperature dark state for a long time when the electrons of the discharge gas is in the ground state until the electrons reach the excited state even if a high voltage is applied through the common electrode 30 Since a predetermined time is required, a lighting delay occurs.

In general, when a high voltage is applied to the electrode, a predetermined voltage is induced around the electrode according to the distance of the electrode. When the LED module 50 is disposed adjacent to the line electrode 32 as described above, the LED 53 can be emitted by the induced voltage even without a direct electrical connection to the LED module 50.

Therefore, in the embodiment of the present invention, when a high voltage is applied to the line electrode 32, the LED module 50 emits light immediately, and the light is discharged into the space inside the backlight device to discharge the inside of the fluorescent lamp 40. Will stimulate the gas. The electrons in the ground state are excited by the light of the LED 53 and the initial lighting time of the fluorescent lamp through the external electrode 41 can be shortened.

The magnitude of the induced voltage may include a distance D1 between the line electrode 32 and the first organic electrode 51, a length L1 of the first organic electrode 51 adjacent to the line electrode 32, and a cover bottom ( 10) and the distance D2 between the second organic electrode 52 and the length L2 of the second organic electrode 52. That is, the shorter the distance D1 between the line electrode 32 and the first organic electrode 51 is, the longer the length L1 of the first organic electrode 51 is.

For example, a high voltage of about 1000 V is applied to the common electrode in order to drive an external electrode fluorescent lamp of a backlight device. A distance D1 between the line electrode 32 and the first organic electrode 51 is 0.25 mm to 1.0. mm, when the length L1 of the first organic electrode 51 is 10.0 mm and the length L2 of the second organic electrode 52 is about 5.0 mm, the first organic electrode 51 is about 2V. Internal and external voltages are induced to cause the LED 53 to emit sufficient light. In this case, it is preferable that the distance D2 between the cover bottom 10 and the second organic electrode 52 is in contact with each other as 0 mm.

5 is a partial perspective view illustrating a backlight device according to another embodiment of the present invention, FIGS. 6 and 7 are cross-sectional views illustrating a backlight device according to the embodiment of FIG. 5, and FIG. 8 is a backlight according to the embodiment of FIG. 5. A perspective view of an LED module of the device.

In the backlight device according to another embodiment of the present invention, in the backlight device according to the embodiment of FIGS. Take a look.

LED module 60 according to another embodiment of the present invention is the first organic electrode frame 64 and the second organic electrode which is contacted and grounded to the cover bottom 10 disposed at a predetermined distance from the line electrode 32 The frame 65 is provided, and the LED 63 is electrically connected to the first organic electrode frame 64 and the second organic electrode frame 65 by the first organic electrode 61 and the second organic electrode 62. It is connected and configured. The first organic electrode frame 64, the second organic electrode frame 65, the first organic electrode 61, and the second organic electrode 62 are each made of a metal conductor.

Specifically, the first organic electrode frame 64 and the second organic electrode frame 65 are formed with a fastening means 66 to be detachable to the panel 22 of the lamp guide bottom 20, corresponding to this The locking means 26 is formed in the lamp guide bottom 20.

That is, as shown in FIGS. 6 and 7, the first organic electrode frame 64 has a fastening hole (one end of the frame inserted into a groove formed on one side of the panel 22 of the lamp guide bottom 20). 66 is fixed by the locking jaw 26, and the fastening hole 66 on the other side of the first organic electrode frame 64 is fixed and coupled by the locking protrusion on which the locking jaw 26 is formed on the other side of the panel. do.

At this time, the lamp guide bottom 20 is formed with a contact preventing wall 24 for preventing the first organic electrode frame 64 from being in electrical contact with the line electrode 32, in particular an embodiment of the present invention Accordingly, the first organic electrode frame 64 is fastened to fall at a predetermined interval D3 from the top of the line electrode 32.

By the above configuration, the first organic electrode frame 64 may be stably fastened to the lamp guide bottom 20. When the high voltage is applied to the line electrode 32, the first organic electrode frame 64 may be used. An induced voltage is generated in the

In addition, the second organic electrode frame 65 also has a fastening hole 66 is formed to be fixed to the locking jaw 26 of the lamp guide bottom 20, in particular in accordance with an embodiment of the present invention the second organic The electrode frame 65 is configured such that one end thereof is in contact with the cover bottom 10 and grounded.

Meanwhile, in the first and second organic electrode frames, as shown in FIG. 8, the LED 63 is welded or surface-mounted by the first organic electrode 61 and the second organic electrode 62. The LED module 60 is configured to be electrically connected to the lamp guide bottom 20 between the plurality of external electrode fluorescent lamps 40 as shown in FIG. 5. .

In the backlight device according to another embodiment of the present invention having the above structure, when a high voltage is applied to the line electrode 32 of the common electrode, the first organic electrode frame on the upper side of the line electrode 32 arranged at a predetermined interval An organic voltage is generated at 64, and the induced voltage generates current along the first organic electrode 61, the second organic electrode 62, and the second organic electrode frame 65, thereby causing the LED 63. Will emit light. That is, the LED 63 may emit light by the induced voltage even without a direct electrical connection to the LED module 60.

In addition, the magnitude of the induced voltage may include the distance D3 between the line electrode 32 and the first organic electrode frame 64, the width L3 of the first organic electrode frame 64, the cover bottom 10, and the first. The distance D4 from the second organic electrode frame 65 and the width L4 of the second organic electrode frame 65 may be influenced.

For example, a high voltage of about 1000 V is applied to the common electrode in order to drive an external electrode fluorescent lamp of a backlight device. A distance D3 between the line electrode 32 and the first organic electrode frame 64 is 0.25 mm to 1.0 mm, when the width L3 of the first organic electrode frame 64 is 10.0 mm, and the width L4 of the second organic electrode frame 65 is about 5.0 mm, the first organic electrode 61 may have a width of about 1.0 mm. The voltage around about 2V is induced, so that the LED 63 emits sufficient light. At this time, it is preferable that the distance D4 between the cover bottom 10 and the second organic electrode frame 65 is 0 mm and is in contact with each other.

The LED modules 50 and 60 as described above are preferably disposed at a position where light can reach all the fluorescent lamps in the internal space of the backlight device, and one or more LED modules 50 and 60 may be disposed according to the size of the backlight device.

Although the embodiments of the present invention have been described with reference to the present invention, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

1 is a partial perspective view showing a backlight device according to the prior art,

2 is a partial perspective view showing a backlight device according to an embodiment of the present invention;

3 is a cross-sectional view illustrating a backlight device according to the embodiment of FIG. 2;

4 is a perspective view illustrating an LED module of the backlight device according to the embodiment of FIG. 2;

5 is a partial perspective view showing a backlight device according to another embodiment of the present invention;

6 is a cross-sectional view A-A illustrating the backlight device according to the embodiment of FIG. 5;

FIG. 7 is a cross-sectional view B-B illustrating the backlight device according to the embodiment of FIG. 5; FIG.

8 is a perspective view illustrating an LED module of the backlight device according to the embodiment of FIG. 5.

** Description of symbols for the main parts of the drawing **

10: cover bottom 20: lamp guide bottom

30 common electrode 40 fluorescent lamp

50,60: LED module

21 lamp mounting part 23: lamp guide bottom panel

31 grip electrode 32 line electrode

41: external electrode 42: glass tube

51,61: first organic electrode 52,62: second organic electrode

53,63: LED 64: first organic electrode frame

65: second organic electrode frame 26, 66: fastening means

Claims (3)

In the backlight device using an external electrode fluorescent lamp, A lamp guide bottom disposed at both inner sides of the cover bottom to support the external electrode fluorescent lamp and having a lamp seating portion at an upper side thereof; A common electrode formed by being inserted into the lamp mounting part and contacting the external electrode of the external electrode fluorescent lamp, and a line electrode electrically connecting the grip electrode from an inverter, and fastened to the lamp guide bottom; And And an LED module disposed to be spaced apart from the common electrode to emit light by a voltage induced from the common electrode. The method of claim 1, wherein the LED module, And a first electrode disposed at intervals from the line electrode of the common electrode, a second electrode contacted with a cover bottom and grounded, and an LED connected to the first electrode and the second electrode. delete

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