KR100933445B1 - Backlight unit - Google Patents

Abstract

In order to provide a backlight unit capable of minimizing contact failure between the light emitting lamp and the plate electrode, a backlight for achieving the above object includes a plurality of light emitting lamps having electrodes at both ends of the outside of the tube or without electrodes. field; Upper and lower mechanisms having a plurality of grooves for receiving both ends of the plurality of light emitting lamps on surfaces facing each other; It includes a plate electrode formed to be embedded along the groove in the longitudinal direction of the upper and lower mechanisms for applying power to the light emitting lamp, the slit formed on the upper portion of the both sides of the groove and the corresponding portion of the upper surface extending therefrom. do.

Description

Back light unit {BACK LIGHT UNIT}

1 is a perspective view of a conventional direct type backlight unit

2 is a view illustrating a power lead wire connected to a conventional light emitting lamp and a connector;

3A and 3B are views illustrating an external electrode light emitting lamp and an electrodeless light emitting lamp

4 is a perspective view of a backlight unit before coupling according to another conventional method

5 is an enlarged perspective view of a portion of FIG. 4;

6A and 6B are cross-sectional views of a plate electrode and a light emitting lamp according to the prior art before and after external force is generated.

7A and 7B are perspective views of a backlight unit before coupling according to an embodiment of the present invention.

8 is an enlarged perspective view of a part of a plate electrode and a light emitting lamp before coupling according to an embodiment of the present invention;

9A and 9B are cross-sectional views of a plate electrode and a light emitting lamp according to the present invention before and after an external force is generated.

Explanation of symbols on the main parts of the drawings

61: light emitting lamp 63, 63a: electrode

71a, 71b: 1st, 2nd lower mechanism 73a, 73b: 1st, 2nd lower mechanism                 

75: groove 77a, 77b, 77c, 77d: plate electrode

80: slit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back light unit, and more particularly, to a back light unit for a liquid crystal display device capable of minimizing contact failure between a light emitting lamp and a plate electrode caused by an external force.

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 unit used as a light source behind the liquid crystal panel, and the mounting of the back light unit is inefficient in terms of thickness, weight, and power consumption. There is still a lot of research going on.

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

In the direct type, the light emitting lamp is arranged on a flat surface. Since the shape of the light emitting 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 disposed 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 unit also increases. When the direct backlight unit is enlarged, the light exit surface is not flat unless the light scattering means secures sufficient thickness. For this reason, the thickness of the light scattering means must be sufficiently secured.

On the other hand, the light guide plate method is to install a light emitting lamp on the outside and to distribute the light to the entire surface using the light guide plate, the light emitting 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 unit is mainly used in the liquid crystal display device where brightness is more important than the screen thickness, and the thickness is the same as that of a notebook PC or a monitor PC. In the liquid crystal display device in which the importance is important, a light guide plate type backlight unit is mainly used.

Currently, as a part of implementing a high-brightness backlight unit, research and development on the direct type backlight unit have continued, such as placing several lamps under the display screen or bending one lamp. have.

Hereinafter, a backlight unit 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 conventional direct type backlight unit for a 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 unit 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 driving circuit by connecting to a separate connector. A separate connector is required for each (1).

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

However, such a conventional backlight unit 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 thickness of the backlight unit can be reduced. The purpose is to not only reduce work efficiency because the power lead wire is bent and connected to the connector for the purpose, but also a separate work is required for this purpose, which increases process time and decreases 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. Falling and maintenance of the luminous lamp is difficult.

Next, a backlight unit for a liquid crystal display device according to another conventional method will be described.

4 is a perspective view of a backlight unit before coupling according to another conventional method, and FIG. 5 is an enlarged perspective view of a portion of FIG. 4.

6A and 6B are cross-sectional views of a plate electrode and a light emitting lamp according to the prior art before and after external force is generated.

4A, a plurality of light emitting lamps 31 having electrodes 33 and 33a formed at both ends outside the tube; The first and second lower mechanisms having a plurality of grooves 45 formed on one surface thereof to accommodate both ends of the plurality of light emitting lamps 31 are disposed at predetermined intervals (L) in accordance with the length of the light emitting lamp ( 41a and 41b); Fixing and supporting the light emitting lamp together with the first and second lower mechanisms 41a and 41b and disposed at the same interval L as the first and second lower mechanisms 41a and 41b and having the same groove 45. First and second upper mechanisms 43a and 43b formed with a); Plate electrodes 47a and 47b respectively formed on the grooved surfaces of the first and second lower mechanisms 41a and 41b and the first and second upper mechanisms 43a and 43b to apply power to the light emitting lamps; 47c, 47d).

The groove 45 is formed such that the end of the light emitting lamp is invisible when viewed from the outside of the mechanism when the first and second lower mechanisms 41a and 41b and the first and second upper mechanisms 43a and 43b are coupled to each other. In the external shape, size and shape of the light emitting lamp, the first and second lower mechanisms 41a and 41b accommodate half of the diameter of the light emitting lamp, and the first and second upper mechanisms 43a and 43b. Accept the other half.

In the above, the grooves of the first and second lower mechanisms 41a and 41b or the first and second upper mechanisms 43a and 43b have either or both upper and lower mechanisms accommodating more than half of the diameter of the light emitting lamp, depending on the assembly structure. It may be formed to.

The plate electrodes 47a, 47b, 47c, and 47d are formed on the surface on which the grooves 45 of the respective mechanisms are formed, as shown in Figs. 5 and 6A. It is formed by embedding a conductive material in the groove.                         

The light emitting lamps 31 have electrodes formed at both ends of the outside of the tube, and one electrode 33 is formed on the plate electrodes 47a and 47c formed on opposite surfaces of the first lower mechanism 41a and the first upper instrument 43a. The other electrodes 33a are commonly connected to the plate electrodes 47b and 47d formed on opposite surfaces of the second lower mechanism 41b and the second upper mechanism 43b.

 In the EEFL plate electrode structure as described above, the plate electrode is shown in FIG. 6B due to the influence of the pitch between the light emitting lamps of the instruments 41a, 41b, 43a, 43b, the inter-component interference, and the shape of the groove 45 of the instrument. As one may receive, a force (external force) is pulled or pressed.

When the external force is generated in this way, the area of contact between the light emitting lamp 31 and the plate electrode 47a is reduced, making it difficult to stably apply an electrode to the light emitting lamp 31 to emit light. This makes it difficult to ensure the reliability of the product.

The present invention has been made to solve the above problems, and in particular, it is an object of the present invention to provide a backlight unit that can minimize the poor contact between the light emitting lamp and the plate electrode.

The backlight unit of the present invention for achieving the above object has a plurality of light emitting lamps having electrodes at both ends of the outside of the tube or the electrode; Upper and lower mechanisms having a plurality of grooves for receiving both ends of the plurality of light emitting lamps on surfaces facing each other; It includes a plate electrode formed to be embedded along the groove in the longitudinal direction of the upper and lower mechanisms for applying power to the light emitting lamp, the slit is formed in the portion corresponding to the upper surface and the upper surface extending on both sides of the groove; Characterized in that configured.

The groove corresponds to the appearance of the light emitting lamp.

The plate electrode is formed on opposing surfaces of at least one of the upper and lower instruments opposing each other.

In addition, the backlight unit according to an embodiment of the present invention includes a plurality of light emitting lamps having electrodes at both ends of the outside of the tube or electrodeless; First and second lower mechanisms disposed at predetermined intervals and having a plurality of grooves formed on one surface thereof to accommodate both ends of the plurality of light emitting lamps; First and second upper mechanisms for fixing and supporting the light emitting lamp together with the first and second lower mechanisms, the first and second upper mechanisms being disposed at the same interval as the first and second lower mechanisms and having the same grooves; It is characterized in that it comprises a plate electrode is formed to be embedded along the groove in the longitudinal direction of the first, the second upper portion and the lower mechanism, the slit is formed in a portion corresponding to the upper side and the upper surface extending on both sides of the groove. .

Hereinafter, a backlight unit according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

7A and 7B are perspective views of a backlight unit before coupling according to an embodiment of the present invention, and FIG. 8 is an enlarged perspective view before coupling of a portion of a plate electrode and a light emitting lamp according to an embodiment of the present invention.

9A and 9B are cross-sectional views of the plate electrode and the light emitting lamp according to the present invention before and after the external force is generated.

According to an embodiment of the present invention, the backlight unit includes a plurality of light emitting lamps 61 having electrodes 63 and 63a formed at both ends of the outer tube as shown in FIG. 7A; First and second lower portions having a plurality of grooves 75 formed on one surface thereof to accommodate both ends of the plurality of light emitting lamps 61 and disposed at predetermined intervals L to match the length of the light emitting lamp 61. Appliances 71a and 71b; Fixing and supporting the light emitting lamp 61 together with the first and second lower mechanisms 71a and 71b, disposed at the same interval L as the first and second lower mechanisms 71a and 71b, and the same. First and second upper appliances 73a and 73b in which grooves 75 are formed; The first and second lower mechanisms 71a and 71b and the first and second upper mechanisms 73a and 73b are formed along the grooved surfaces, respectively, and slits 80 are formed on both sides of the groove 75. And plate electrodes 77a, 77b, 77c, and 77d for applying power to the formed light emitting lamp.

At this time, the light emitting lamps 61 have electrodes formed at both ends of the outside of the tube, and one electrode 63 is formed on the plate electrodes 77a and 77c formed on opposite surfaces of the first lower mechanism 71a and the first upper mechanism 73a. ), And the other electrodes 63a are commonly connected to the plate electrodes 77b and 77d formed on opposite surfaces of the second lower mechanism 71b and the second upper mechanism 73b.

As illustrated in FIG. 7B, the light emitting lamp 61 of the backlight unit may be configured using an electrodeless light emitting lamp 61 having no electrodes formed at both ends thereof. In this case, the plate electrodes 77a, 77b, and 77c may be used. , 77d) serves as an electrode of the light emitting lamp 61.

The groove 75 is formed such that the end of the light emitting lamp is not visible when viewed from the outside of the mechanism when the first and second lower mechanisms 71a and 71b and the first and second upper mechanisms 73a and 73b are coupled to each other. The same as the external shape, size and shape of the light emitting lamp 61, the first and second lower mechanisms (71a, 71b) accommodates half the diameter of the light emitting lamp 61, the first and second upper portion Appliances 73a and 73b receive the other half.

In the above, the grooves 75 of the first and second lower mechanisms 71a and 71b and the first and second upper mechanisms 73a and 73b have either of the upper and lower mechanisms of the light emitting lamp 61 depending on the assembly structure. It may be formed to accommodate more than half of the diameter.

The plate electrodes 77a, 77b, 77c, and 77d are formed on the surface on which the grooves 75 of the respective instruments are formed, as shown in FIGS. 7A, 7B, and 8, and a plurality of grooves in the longitudinal direction of the instruments. It is formed by burying the conductive material along the groove.

As described above, since the light emitting lamps are collectively connected to a power source through plate electrodes formed on the inner surfaces of the first, second upper and lower mechanisms, a separate connector is not required for each light emitting lamp. The upper and lower mechanisms can be separated and combined to facilitate easy maintenance such as lamp replacement and maximize work efficiency.

In addition, the plate electrodes 77a, 77b, 77c, and 77d have a slit 80 formed on both sides of the groove and on the plate electrodes 77a, 77b, 77c, and 77d extending therefrom. It is formed so as not to be influenced by the area in contact with it.

In other words, the plate electrodes 77a, 77b, 77c, and 77d are not only when no external force is generated as shown in Figs. 9A and 9B, but also by the external force and the shape of the peripheral parts. , And 77d) is formed so as to surround the light emitting lamp 61 stably while maintaining a circular shape even if the entire portion is extended.

As described above, the light emitting lamp 61 can stably contact the plate electrodes 77a, 77b, 77c, and 77d even when an external force is generated, thereby maintaining its area.

Although not shown in the drawings, the plate electrode may be formed only on opposing surfaces of at least one of the first, second upper and lower instruments opposing each other.

The present invention is not limited to the above embodiments, and includes various forms that can be easily derived by those skilled in the art from the above embodiments.

On the other hand, such a back light unit of the present invention can be used as a light source in the rear or front of various display devices, including a liquid crystal display device, as a light emitting device as it is.

The backlight unit of the present invention as described above has the following effects.

By forming a slit in the upper portion of the groove of the plate electrode and the plate electrode extending therefrom, it is possible to minimize the poor contact between the light emitting lamp and the plate electrode even if an external force is generated.

As a result, product defects and reliability can be improved.

Claims (4)

A plurality of light emitting lamps having electrodes at both ends outside the tube or electrodeless; Upper and lower mechanisms having a plurality of grooves for receiving both ends of the plurality of light emitting lamps on surfaces facing each other; It includes a plate electrode formed to be embedded along the groove in the longitudinal direction of the upper and lower mechanisms for applying power to the light emitting lamp, the slit is formed in the portion corresponding to the upper surface and the upper surface extending on both sides of the groove; Back light unit configured. The method of claim 1, The groove is a backlight unit, characterized in that the shape corresponding to the appearance of the light emitting lamp. The method of claim 1, And the plate electrode is formed on an opposite surface of at least one of the upper and lower instruments facing each other. A plurality of light emitting lamps having electrodes at both ends outside the tube or electrodeless; First and second lower mechanisms disposed at predetermined intervals and having a plurality of grooves formed on one surface thereof to accommodate both ends of the plurality of light emitting lamps; First and second upper mechanisms for securing and supporting the light emitting lamp together with the first and second lower mechanisms, the first and second upper mechanisms being disposed at the same interval as the first and second lower mechanisms and having grooves to receive the light emitting lamps; And a plate electrode formed to be buried along the groove in the longitudinal direction of the first, second upper and lower mechanisms, and having a slit formed at a portion corresponding to an upper surface extending from both sides of the groove and an upper surface extending therefrom. Back light unit.

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