KR20030050339A - Back light of liquid crystal display device - Google Patents

Abstract

PURPOSE: A back light of a liquid crystal display is provided to fabricate the back light using multiple light-emitting lamps having electrodes to improve productivity. CONSTITUTION: A back light of a liquid crystal display includes a plurality of light-emitting lamps(20). The back light is composed of an external electrode(22), an insulating layer(30), and a connector(40). The external electrode is formed at each of both ends of each of the light-emitting lamps. The insulating layer seals the external electrode and has an opening for exposing a portion of the external electrode. The connector electrically connects the multiple light-emitting lamps through the openings formed on the lamps.

Description

BACK LIGHT OF LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back light of a liquid crystal display device, and more particularly to a backlight of a liquid crystal display device using a light emitting lamp that can be employed in a large area high brightness backlight.

Ultra-thin flat panel display devices with a thickness of only a few centimeters (cm), liquid crystal displays (LCDs) are mainly used for notebook computers, monitors, spacecraft, aircraft, etc. The field is wide and diverse.

Among the liquid crystal display devices, the passive light emitting liquid crystal display device is equipped with a back light, which is used as a light source behind the liquid crystal panel, and the mounting of the backlight is inefficient in terms of thickness, weight, and power consumption. Much research is going on.

In general, a so-called backlight used as a light source of a liquid crystal display device is a method of disposing a cylindrical fluorescent lamp, which is divided into a direct type method and a light guide plate method.

In the direct type, the fluorescent lamp is disposed on a flat surface. Since the shape of the fluorescent lamp appears on the liquid crystal panel, the gap between the lamp and the liquid crystal panel must be maintained, and the light scattering means must be arranged for the uniform distribution of light. There is a limit. In addition, as the panel becomes larger, the area of the light exit surface of the backlight also increases. When the direct backlight is enlarged, the light exit surface is not flat unless the light scattering means secures sufficient thickness. Therefore, the thickness of the light scattering means must be sufficiently secured.

On the other hand, the light guide plate method is to install a fluorescent lamp on the outside and to distribute the light to the entire surface using the light guide plate, the fluorescent lamp is installed on the side, there is a problem that the brightness is low because the light must pass through the light guide plate. In addition, high optical design and processing technology for the light guide plate is required for uniform distribution of light intensity.

Since the direct type and the light guide plate have their disadvantages, the direct type backlight is mainly used in the liquid crystal display device where brightness is more important than the screen thickness. In the liquid crystal display device of importance, a light guide plate type backlight is mainly used.

Currently, as part of implementing a high-brightness backlight, research and development on direct backlights have continued, such as disposing several lamps on the lower side of a display screen or bending one lamp.

Hereinafter, a backlight for a liquid crystal display device according to the prior art will be described with reference to the accompanying drawings.

1 is a perspective view of a direct backlight for a conventional liquid crystal display, and FIG. 2 is a view showing a power lead wire connected to a conventional light emitting lamp and a connector.

As shown in FIG. 1, a conventional backlight for a liquid crystal display device includes a plurality of light emitting lamps 1, an outer case 3 for fixing and supporting the light emitting lamps 1, and the light emitting lamp 1. And light scattering means 5a, 5b, 5c disposed between the liquid crystal panel (not shown).

The light scattering means (5a, 5b, 5c) is to prevent the shape of the light emitting lamp from appearing on the display surface of the liquid crystal panel and to provide a light source having an overall uniform brightness distribution, in order to enhance the light scattering effect A plurality of diffusion sheets, diffusion plates, and the like are disposed between the cells.

The inner surface of the outer case 3 is disposed with a reflector 7 so that the light emitted from the light emitting lamp 1 can be concentrated to the display unit of the liquid crystal panel, which is to maximize the utilization efficiency of the light.

The light emitting lamp 1 is a Cold Cathode Fluorescent Lamp (CCFL) as shown in FIG. 2, and electrodes 2 and 2a are disposed at both ends of a tube to emit light when power is applied to the electrodes. Both ends of the light emitting lamp 1 are fitted in grooves formed on both sides of the outer case 3 as shown in FIG.

Power lead wires 9 and 9a for transmitting power for driving the lamps are connected to both electrodes of the light emitting lamp, and the power lead wires 9 and 9a are connected to a separate connector 11 to be connected to a driving circuit. A separate connector is required for each light emitting lamp 1.

That is, as shown in FIG. 2, a power lead wire 9 connected to one electrode 2 of the light emitting lamp and a power lead wire 9a connected to the other electrode 2a are connected to one connector 11. One of the voltage lead lines 9 and 9a is bent to the bottom of the outer case 3 and connected to the connector 11.

However, such a conventional backlight for a liquid crystal display device has a connector connected to a power supply lead of a light emitting lamp and connected to a driving circuit. Since the connector is individually required for each light emitting lamp, wiring is complicated and the purpose of reducing the thickness of the backlight is reduced. By bending the lead wire to connect with the connector, not only the work efficiency is lowered, but also a separate work is required for this, which increases the process time and reduces productivity.

In addition, in order to connect the electrode and the connector, a hole penetrating the outer case must be drilled, and both electrodes of the light emitting lamp must be inserted into the hole so that both electrodes of the light emitting lamp are exposed to the outside of the outer case. .

Accordingly, the present invention has been made to solve the above problems, to provide a backlight of the liquid crystal display device that can maximize the work efficiency and productivity by manufacturing a backlight using a plurality of light emitting lamps with electrodes formed on both ends. There is a purpose.

1 and 2 is an external view illustrating a backlight of a conventional liquid crystal display device.

3 is an external view of a light emitting lamp constituting a backlight of a liquid crystal display according to an exemplary embodiment of the present invention.

4 is a cross-sectional view of FIG.

5 is a cross-sectional view illustrating an electrical connection method of the light emitting lamp of FIG. 3.

6 is an external view illustrating a state in which a plurality of light emitting lamps are electrically connected to each other.

7 is an overall external view for explaining a backlight of the liquid crystal display device of the present invention.

Explanation of symbols on the main parts of the drawings

20: light emitting lamp 22: electrode

30 insulating film 32 opening

40: electrode connection line 40a: connection means

42: sealant 41a, 41b: first, second lower mechanism

43a, 43b: 1st, 2nd upper mechanism 45: Groove

The present invention for achieving the above object in the backlight (Back Light) of the liquid crystal display device having a plurality of light emitting lamps, the external electrode is provided on both ends of the light emitting lamp to be electrically conductive, and a part of the external electrode And an insulating layer having an opening exposing an area and sealing the external electrode, and connecting means for electrically connecting the plurality of light emitting lamps through the opening.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

3 is an external view of a light emitting lamp constituting a backlight of a liquid crystal display according to an exemplary embodiment of the present invention, FIG. 4 is a cross-sectional view of FIG. 3, and FIG. 5 is a cross-sectional view showing an electrical connection method of the light emitting lamp of FIG. 3. 6 is an external view illustrating a state in which a plurality of light emitting lamps are electrically connected to each other, and FIG. 7 is an overall external view according to an embodiment of the present invention.

First, as shown in FIGS. 3 and 4, the backlight of the liquid crystal display according to the exemplary embodiment of the present invention includes a plurality of light emitting lamps 20. In the figure, one light emitting lamp 20 is shown for ease of explanation. The light emitting lamp 20 has been introduced in SID 99 DIGEST pp760-763 and Utility Model Publication No. 20-0211527 as an external electrode fluorescent lamp. In the above-described light emitting lamp 20, a phosphor is coated on an inner wall of the light emitting lamp 20, and an electrode 22, which is a conductor, is formed to be electrically connected to both ends of the light emitting lamp. Since the light emitting lamp 20 having such an electrode 22 has a wide electrode 22, electrical shock or noise may occur, and other effects (ozone destruction) due to high voltage may be concerned.

In order to prevent such an effect, in the embodiment of the present invention, the electrode 22 is sealed using the insulating film 30. That is, the electrode 22 formed at both ends of the light emitting lamp 20 is not exposed to the external air layer, thereby preventing the influence of the high voltage high frequency electric energy applied to the electrode 22 at the both ends of the lamp to drive the lamp.

In addition, the insulating film 30 has an opening 32 exposing a portion of the electrode 22. This is for electrically connecting the plurality of light emitting lamps 20 through the opening 32, and the size or shape thereof is not limited.

5 illustrates an electrical connection method for driving the light emitting lamps 20.

As shown in the drawing, the electrode connecting line 40 or the like is connected to the electrode 22 exposed through the opening 32 on the insulating film 30 to electrically connect the electrodes of the lamp driving device (not shown) or other light emitting lamps. Can be connected.

After the external electrode connection line 40 is connected, the sealant 42 is completely sealed by using a material such as silicon. This is to stably maintain the connection between the electrode 22 and the electrode connecting line 40 and to remove the exposed portion of the electrode 22.

6 illustrates a state in which a plurality of light emitting lamps 20 having the above structure are electrically connected to each other. The connecting means 40a for connecting the electrode 22 may be a wire of a flexible material, or may be a PCB in which a conductor plate or an electrical connection line maintaining a constant shape is patterned.

The backlight of the liquid crystal display according to the exemplary embodiment of the present invention using the light emitting lamp is combined as follows to form a backlight.

As shown in FIG. 7, a plurality of light emitting lamps 20 having electrodes 22 formed on both ends of the outside of the tube, and a plurality of light emitting lamps 20 are disposed at predetermined intervals in accordance with the length of the light emitting lamp 20, and the plurality of light emitting lamps 20 are disposed on one surface thereof. Together with the first and second lower mechanisms 41a and 41b and the first and second lower mechanisms 41a and 41b in which a plurality of grooves 45 are formed to accommodate both ends of the light emitting lamps 20. A backlight including first and second upper appliances 43a and 43b disposed at the same interval as the first and second lower appliances 41a and 41b and having the same groove 45 formed thereon to fix and support the light emitting lamp. To provide.

When the lower apparatuses 41a and 41b and the upper apparatuses 43a and 43b are coupled together, the connecting means 40a is connected to both ends of the light emitting lamp 20 when viewed from the outside of the apparatus, thereby providing a plurality of light emitting lamps 20. To allow electrical conduction.

The groove 45 is the same in appearance and size and shape of the light emitting lamp 20, so that the lower mechanism (41a, 41b) receives half of the diameter of the fluorescent lamp, the upper mechanism (43a, 43b) the rest Accept half.

In the backlight according to the embodiment of the present invention having the above structure, since the light emitting lamps 20 are simultaneously connected to the connecting means 40a and connected to the driving circuit through one connector (not shown), The number can be greatly reduced, thereby simplifying the wiring with the driving circuit and maximizing the efficiency of the work.

Although not shown in the drawings, the light emitted from the light emitting lamp 20 may be scattered on the upper side of the first and second upper mechanisms 43a and 43b so that a uniform light distribution may be formed on the display surface of the liquid crystal panel. Light scattering means such as a diffusion sheet and a diffusion plate are further disposed.

In addition, the light emitting lamp 20 may be applied to a backlight of a conventional direct type structure, and may be applied to a backlight through deformation of the apparatuses.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

The backlight of the liquid crystal display of the present invention described above has the following effects.

The electrodes 22 formed on the outer ends of the light emitting lamp 20 are sealed by using the insulating film 30 so that the electrodes 22 are not exposed to the external air layer, so that the electrodes 22 at both ends of the lamp are driven to drive the lamp. The influence of the applied high voltage high frequency electrical energy can be blocked.

In addition, since the light emitting lamps 20 are simultaneously connected to the connecting means 40a and connected to the driving circuit through one connector, the number of connectors can be greatly reduced as compared with the related art. Therefore, by using a light emitting lamp that can be employed in a large area high-brightness backlight suitable for a liquid crystal display device, wiring with a driving circuit can be simplified, and work efficiency and productivity can be maximized.

Claims (6)

In the backlight of the liquid crystal display device having a plurality of light emitting lamps, External electrodes provided at both ends of the light emitting lamp and electrically connected to each other; An insulating film having an opening for exposing a portion of the external electrode and sealing the external electrode; And a connecting means for electrically connecting the plurality of light emitting lamps through the openings. The method of claim 1, And a sealant for sealing the opening. The method of claim 1, The light emitting lamp is a backlight of the liquid crystal display device, characterized in that the phosphor is coated on the inner wall. The method of claim 2, The sealant is a backlight of the liquid crystal display device, characterized in that the silicon material. The method of claim 1, The connecting means is a backlight of the liquid crystal display device, characterized in that any one of a wire, a conductor plate processed for connection, and a PCB substrate patterned electrical connection line. A plurality of light emitting lamps comprising the structure of claim 1; First and second lower mechanisms disposed at predetermined intervals in accordance with the length of the light emitting lamp and having a plurality of grooves formed at one surface thereof to accommodate both ends of the plurality of light emitting lamps; And fixing the first and second lower appliances together with the first and second lower instruments, the first and second upper instruments being disposed at the same interval as the first and second lower instruments and having the same groove. Backlight of the liquid crystal display device.