KR100413490B1 - Back light - Google Patents

Abstract

The present invention provides a plurality of light emitting lamps having electrodes at both ends outside the tube or electrodeless, and a plurality of grooves for receiving both ends of the plurality of light emitting lamps on opposite sides of the tube and the light emitting lamp. The upper and lower mechanism having a conductive layer for the light, and the backlight comprising a light scattering means on the upper side of the upper apparatus, each light emitting lamp does not require a separate connector can simplify the connection wiring with the drive circuit In addition, it is possible to separate and combine the mechanism, and easy maintenance and maintenance, such as replacement of the light emitting lamp, improve the efficiency of the work to provide a backlight with improved productivity.

Description

Back light {BACK LIGHT}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back light, and more particularly to a back light for a liquid crystal display device.

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 own disadvantages, the direct type type backlight is mainly used in the liquid crystal display device where brightness is more important than the screen thickness, and thickness such as a notebook PC or a monitor PC is important. In the liquid crystal display device, 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 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 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 such a connector is individually required for each light emitting lamp, wiring is complicated and power is supplied to reduce the thickness of the backlight. 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 process time and lowers 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.

The present invention has been made to solve the above problems of the prior art, the object is to provide a backlight that is easy to maintain and repair, maximizing the work efficiency and productivity.

1 is a perspective view of a conventional direct backlight.

2 is a view showing a power lead wire connected to a conventional light emitting lamp and a connector.

3A and 3B illustrate a light emitting lamp according to the present invention.

4A and 4B are perspective views of a backlight before coupling according to the first embodiment of the present invention.

4C is a perspective view of the backlight after coupling according to the first embodiment of the present invention.

5A and 5B are perspective views of a backlight before coupling according to a second embodiment of the present invention.

5C is a perspective view of the backlight after coupling according to the second embodiment of the present invention.

6A and 6B are perspective views of a backlight before coupling according to a third embodiment of the present invention.

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

8A and 8B are perspective views of a backlight before coupling according to a fifth embodiment of the present invention.

9A and 9B are perspective views of a backlight before coupling according to a sixth embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

31, 31a: fluorescent lamp

33,33a: electrode

41a, 41b: first and second lower mechanisms

43a, 43b: first and second upper appliances

45: home

47a, 47b, 47c, 47d: conductive layer

91a, 91b, 91c: Lower support

100a, 100b: upper support

In order to achieve the above object, the present invention provides a plurality of light emitting lamps having electrodes at both ends of the outside of the tube or electrodeless; Upper and lower mechanisms having a plurality of grooves for receiving both ends of the plurality of light emitting lamps and a conductive layer for applying power to the light emitting lamps on surfaces facing each other; It provides a backlight comprising a light scattering means formed on the upper side of the upper mechanism.

The groove is preferably in a shape corresponding to the appearance of the light emitting lamp. In addition, the conductive layer is formed on opposite surfaces of at least one of the upper and lower appliances facing each other to electrically connect the grooves.

The backlight according to the present invention of the above structure does not require a separate connector for each light emitting lamp because the light emitting lamps are collectively connected to a power source through conductive layers formed on the inner surfaces of the upper and lower mechanisms. The lower fixtures can be separated and combined for easy maintenance such as lamp replacement and maximize work efficiency.

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

First embodiment

4A is a perspective view showing a state before coupling of a backlight according to a first embodiment of the present invention;

The present invention, as shown in Figure 4a, the plurality of light emitting lamps 31, the electrode (33, 33a) is formed on both ends outside the tube; The first and second lower mechanisms are arranged at predetermined intervals (L) in accordance with the length of the light emitting lamp and have a plurality of grooves 45 formed on one surface thereof to accommodate both ends of the plurality of light emitting lamps 31. 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; It provides a backlight including a conductive layer (47a, 47b, 47c, 47d) is formed in each of the grooved surface of the mechanism (41a, 41b, 43a, 43b) to apply power to the light emitting lamp.

The groove 45 is formed so as to completely penetrate the mechanism so that the end of the light emitting lamp when viewed from the outside of the mechanism when the lower mechanism (41a, 41b) and the upper mechanism (43a, 43b) is combined, the appearance of the light emitting lamp The same in shape, size and shape, the lower fixtures 41a and 41b receive half of the fluorescent lamp diameter and the upper fixtures 43a and 43b receive the other half.

The conductive layers 47a, 47b, 47c, and 47d are formed on the surface on which the grooves 45 of the respective mechanisms are formed, and the grooves are formed in the grooves in the longitudinal direction of the fixtures so that the conductive material is embedded in the grooves. Alternatively, it may be formed by coating a conductive material on the surface on which the groove is formed without being buried.

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 opposite surfaces of the first lower mechanism 41a and the first upper instrument 43a. The other electrodes 33a are commonly connected to the conductive layers 47b and 47d formed on opposite surfaces of the second lower mechanism 41b and the second upper mechanism 43b.

On the other hand, the light emitting lamp can be used as an electrodeless light emitting lamp that does not have an electrode. 4B is a perspective view of a backlight having the same structure as that of FIG. 4A, except that an electrodeless light emitting lamp 31a in which no electrode is formed as a light emitting lamp is used. Therefore, the same reference numerals are given. In the case of the backlight as shown in FIG. 4B, the conductive layers 47a, 47b, 47c, and 47d formed on opposite surfaces of the appliances 41a, 41b, 43a, and 43b serve as electrodes, so that the light emitting lamps ( 31) to supply power.

FIG. 4C illustrates a combined state of the backlight according to the first embodiment of the present invention having the above structure. In the backlight according to the present invention, as shown in FIG. 4C, the light emitting lamps 31 may have a conductive layer 47a. 47b, 47c, and 47d) is connected to the drive circuit through a single connector, which can significantly reduce the number of connectors compared with the prior art, thereby simplifying the wiring with the drive circuit, and improves the efficiency of operation It can be maximized.

On the other hand, although not shown in the figure, the light emitted from the light emitting lamp 31 is scattered so as to have a uniform light source distribution on the display surface of the liquid crystal panel above the first and second upper mechanisms 43a and 43b. Light scattering means such as a diffusion sheet and a diffusion plate are further disposed.

Second embodiment

5A and 5B are perspective views showing a state before coupling of a backlight according to a second embodiment of the present invention, and FIG. 5C is a perspective view showing a state after coupling thereof.

FIG. 5A relates to a backlight using the light emitting lamp 31 in which electrodes 33 and 33a are formed at both ends of the outside of the tube as shown in FIG. 4A, and FIG. 5B is a non-electrode formed as shown in FIG. 4B. It relates to a backlight using the electrode light emitting lamp 31a.

According to the second embodiment of the present invention, the light emitting lamps 31 and 31a are fixed and supported more stably without moving from side to side in the longitudinal direction, and emit light when viewed from the outside of the apparatus as in the first embodiment. Rather than completely penetrating the instrument such that the end of the lamp is visible, the outside of the instrument is left. The structure of the other backlights was the same as in the first embodiment, and therefore the same reference numerals as in the first embodiment were given.

Third embodiment

6A is a perspective view showing a state before coupling of a backlight according to a third embodiment of the present invention;

The present invention, as shown in Figure 6a, the plurality of light emitting lamps 31, the electrode (33, 33a) is formed on both ends of the outer tube; The first and second lower mechanisms are arranged at predetermined intervals (L) in accordance with the length of the light emitting lamp and have a plurality of grooves 45 formed on one surface thereof to accommodate both ends of the plurality of light emitting lamps 31. 41a and 41b) and lower support portions 91a, 91b and 91c formed therebetween to support the first and second lower mechanisms 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; It provides a backlight including a conductive layer (47a, 47b, 47c, 47d) is formed in each of the grooved surface of the mechanism (41a, 41b, 43a, 43b) to apply power to the light emitting lamp.

As described above, the backlight according to the third exemplary embodiment of the present invention can more stably fix and support the fluorescent lamp by securing the support force between the fixture and the fixture having the conductive layer for supplying power to the fluorescent lamp. I would have to.

That is, in the backlight according to the first and second embodiments of the present invention, while the first lower mechanism 41a and the second lower mechanism 41b are separated from each other at a predetermined interval, the third light of the present invention is used. The backlight according to the embodiment forms a lower support portion (91a, 91b, 91c) in the space and the side defined by the first lower mechanism (41a) and the second lower mechanism (41b), the support (91a, 91b) And 91c and the first and second lower mechanisms 41a and 41b are integrally formed.

In addition, the inner surfaces of the first and second lower mechanisms 41a and 41b and the lower support parts 91a, 91b and 91c may be formed of a material having excellent light reflecting ability, for example, a synthetic resin having excellent light reflecting ability, thereby improving the function of the reflecting plate. It is possible to perform or to coat a separate reflective material on the inner surface of the first and second lower mechanism (41a, 41b) and the support (91a, 91b, 91c), so that the light emitted from the light emitting lamp By intensively irradiating toward the liquid crystal panel, light can be used more effectively.

On the other hand, as shown in Fig. 6B, it is also possible to use the electrodeless light emitting lamp 31a in which no electrode is formed as the light emitting lamp.

The structure of the other backlights was the same as in the first embodiment, and therefore the same reference numerals as in the first embodiment were given.

Fourth embodiment

7A and 7B are perspective views showing a state before coupling of the backlight according to the fourth embodiment of the present invention, and FIG. 7A illustrates a bag using a light emitting lamp 31 having electrodes 33 and 33a formed at both ends outside the tube. 7B is related to the backlight using the electrodeless light emitting lamp 31a in which the electrode was not formed.

The fourth embodiment according to the present invention allows the light emitting lamps 31 and 31a to be more stably fixed and supported without movement from side to side in the longitudinal direction, and emits light when viewed from the outside of the apparatus as in the third embodiment. Rather than completely penetrating the instrument such that the end of the lamp is visible, the outside of the instrument is left. The structure of the other backlights was the same as in the third embodiment, and therefore the same reference numerals as those in the third embodiment were given.

Fifth Embodiment

8A is a perspective view illustrating a state before coupling of a backlight according to a fifth embodiment of the present invention;

The third embodiment relates to a backlight having the same structure as in the third embodiment except that the apparatus further includes upper support portions 100a and 100b for supporting the first and second upper mechanisms 43a and 43b. The same sign as.

The upper support portions 100a and 100b are connected to both sides of the first and second upper mechanisms 43a and 43b as a whole so as to prevent the light emitted from the light emitting lamp 31 from being irradiated toward the liquid crystal panel. It is an integral type. Therefore, the light emitting lamp can be more stably fixed and supported.

On the other hand, as shown in Fig. 8B, it is also possible to use the electrodeless light emitting lamp 31a in which no electrode is formed as the light emitting lamp.

Sixth embodiment

9A and 9B are perspective views showing a state before coupling of a backlight according to a sixth embodiment of the present invention, and FIG. 9A illustrates a bag using a light emitting lamp 31 having electrodes 33 and 33a formed at both ends outside the tube. 9B relates to a backlight using an electrodeless light emitting lamp 31a in which no electrode is formed.

In the sixth embodiment of the present invention, the light emitting lamps 31 and 31a are fixed and supported more stably without moving from side to side in the longitudinal direction, and emit light when viewed from the outside of the apparatus as in the fifth embodiment. Rather than completely penetrating the instrument such that the end of the lamp is visible, the outside of the instrument is left. The structure of the other backlights was the same as in the fifth embodiment, and therefore the same reference numerals as those in the fifth embodiment were given.

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 embodiments of the present invention can be used as a light source at the rear or front of various display devices, including a liquid crystal display device, as well as a light emitting device itself.

As described above, the backlight of the present invention has the following effects.

First, since a separate connector is not required for each fluorescent lamp, connection wiring with a driving circuit can be simplified, and productivity can be increased by improving work efficiency.

Second, since it is possible to separate and combine the fixture, it is easy to maintain and maintain the fluorescent lamp replacement.

Third, it is easy to manufacture as a large area light source, and can actively respond as a backlight of a large area liquid crystal display device.

Claims (18)

A plurality of light emitting lamps having electrodes at both ends outside the tube or electrodeless; Upper and lower mechanisms having a plurality of first grooves formed at regular intervals to accommodate both ends of the plurality of light emitting lamps on surfaces facing each other; A conductive layer formed in each of the second groove formed in the longitudinal direction of the upper and lower mechanisms and a surface on which the second groove is formed to apply power to the light emitting lamp; Back light comprising a light scattering means formed on the upper side of the upper mechanism. The method of claim 1, The upper and lower mechanisms can be separated and combined with each other, the backlight. The method of claim 1, The groove has a shape corresponding to the appearance of the light emitting lamp. The method of claim 1, And the conductive layer is formed on opposite surfaces of at least one of the upper and lower appliances facing each other. A plurality of light emitting lamps having electrodes at both ends outside the tube or electrodeless; First and second lower mechanisms having a plurality of first grooves disposed at predetermined intervals in accordance with a length of the light emitting lamp and configured to accommodate both ends of the plurality of light emitting lamps on one surface thereof; First and second upper mechanisms for holding 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 first grooves; And a conductive layer formed on a surface of each of the second grooves and the second grooves formed in the longitudinal direction of the apparatuses to apply power to the light emitting lamp. The method of claim 5, And the first groove is formed to completely penetrate the appliances. The method of claim 5, And the first groove is partially formed to leave the outside of the fixtures. The method according to any one of claims 5 to 7, The conductive layer is formed by embedding a conductive material in the second groove, or is formed by coating a conductive material on each of the appliance. The method of claim 5, And a light scattering means on the upper side of the upper apparatus. A plurality of light emitting lamps having electrodes at both ends outside the tube or electrodeless; First and second lower mechanisms having a plurality of first grooves disposed at predetermined intervals in accordance with lengths of the light emitting lamps and configured to accommodate both ends of the plurality of light emitting lamps on one surface thereof, and the first and second lower parts; A lower support formed therebetween to support the appliance; First and second upper mechanisms for holding 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 first grooves; And And a conductive layer formed in each of the second groove formed in the longitudinal direction of the mechanism and the surface on which the second groove is formed to apply power to the light emitting lamp. The method of claim 10, And the first groove is formed to completely penetrate the appliances. The method of claim 10, And the first groove is partially formed to leave the outside of the fixtures. The method according to any one of claims 10 to 12, The conductive layer may be formed by embedding a conductive material in the second groove or by coating a conductive material on each of the appliances. The method of claim 10, And a light scattering means on the upper side of the upper apparatus. The method of claim 14, And the lower support part is made of a light reflective material. The method of claim 14, And the lower support part is coated with a reflective material on an inner surface thereof. The method of claim 10, And a top support formed at both ends of the first and second upper appliances to support the first and second upper appliances. delete