KR20050088632A - Back light assembly and method for fabricating the same - Google Patents

Abstract

The present invention relates to a backlight assembly having a lamp guide capable of preventing the flow of a light source by a simple assembly process, and an assembly method thereof, comprising: a plurality of light sources arranged in parallel to emit light; An outer case accommodating the plurality of light sources and having fastening holes formed at both sides thereof; Comprising the insertion hole is inserted into each of the light sources, both ends are fastened to the fastening hole of the outer case and comprises a lamp guide connected in a line to fix each light source in a direction perpendicular to the longitudinal direction of the light source.

Description

Back light assembly and method for fabricating the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a backlight assembly having a lamp guide capable of preventing the flow of a light source by a simple assembly process, and a method of assembling thereof.

In recent years, research on flat panel display devices has been actively conducted. Among them, liquid crystal display devices (LCDs), field emission display devices (FEDs), electro-luminescence display devices (ELDs), and PDPs (PDPs) Plasma Display Pannels).

Among them, LCD is the most widely used as a substitute for CRT (Cathode Ray Tube) for the use of mobile image display device because of the excellent image quality, light weight, thinness, and low power consumption, and mobile type such as monitor of notebook computer. In addition, it is being developed in various ways, such as a television for receiving and displaying broadcast signals, and a monitor of a computer.

As described above, although various technical advances have been made in order for the liquid crystal display device to serve as a screen display device in various fields, the task of improving the image quality as the screen display device has many advantages and disadvantages.

Therefore, in order to use a liquid crystal display device in various parts as a general screen display device, the key to development is how much high definition images such as high definition, high brightness, and large area can be realized while maintaining the characteristics of light weight, thinness, and low power consumption. It can be said.

Such a liquid crystal display device may be classified into a liquid crystal display panel displaying an image and a driving unit for applying a driving signal to the liquid crystal display panel, wherein the liquid crystal display panel has a space and is bonded to the first and second substrates. And a liquid crystal layer injected between the first and second substrates.

The first substrate (TFT array substrate) may include a plurality of gate wirings arranged in one direction at a predetermined interval, a plurality of data wirings arranged at regular intervals in a direction perpendicular to the respective gate wirings, and the respective gates. A plurality of pixel electrodes formed in a matrix form in each pixel region defined by crossing wirings and data wirings and a plurality of thin film transistors which are switched by signals of the gate wirings to transfer the signals of the data wirings to the pixel electrodes. Formed.

The second substrate (color filter substrate) includes a black matrix layer for blocking light in portions other than the pixel region, R, G, and B color filter layers for expressing color colors, and a common electrode for implementing an image. Is formed.

The first and second substrates have a predetermined space by spacers and are bonded by a sealant to form a liquid crystal between the two substrates.

Since the liquid crystal display itself is non-luminescent, a separate external light source for irradiating light is required.

 In particular, in the case of a transmissive liquid crystal display, a separate dimming device that emits light and guides the back of the liquid crystal display panel, that is, a back light device is necessary.

The back light includes an edge type method and a direct type method.

In the direct type, a light emitting lamp is disposed on a flat surface. Since the shape of the light emitting lamp appears on the liquid crystal panel, the gap between the light emitting lamp and the liquid crystal display panel should be maintained, and light scattering means is disposed for the uniform distribution of light. There is a limit to thinning because it must be.

In addition, as the liquid crystal display 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. For this reason, the thickness of the light scattering means must be sufficiently secured.

On the other hand, the edge type is to install a light emitting lamp on the outside and to distribute the light to the entire surface using a 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 techniques for the light guide plate are required for uniform distribution of luminance.

Since the direct type and edge type have their disadvantages, the direct type type backlight is mainly used in the liquid crystal display where brightness is more important than the screen thickness. In an important liquid crystal display device, an edge type backlight is mainly used.

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

Hereinafter, a direct backlight of a conventional liquid crystal display device will be described with reference to the accompanying drawings.

1 is a perspective view of a conventional direct type backlight assembly, Figures 2a and 2b is a view for explaining the installation method of a conventional lamp guide.

As shown in FIG. 1, a direct backlight assembly of a conventional liquid crystal display device includes at least one light source 1 for emitting light and a diffuser plate for scattering and diffusing the light emitted from the light source 1. 5a and the light formed on the diffuser plate 5a to receive the light uniformly diffused from the diffuser plate 5a to increase the brightness of the light and provide it to a display unit of a liquid crystal display panel (not shown). A polarizing film 5b, a holder 6 connected to both ends of the respective light sources 1 for fixing the light sources 1, and an outer case 3 for storing the respective components. It is composed.

Here, the diffusion plate 5a and the polarizing film 5b are for preventing the shape of the light source 1 from appearing on the display surface of the liquid crystal display panel and providing light having a uniform brightness distribution as a whole. In order to enhance the effect, a plurality of light sources may be disposed between the light source 1 and the liquid crystal display panel.

In addition, a reflecting plate 7 is disposed on the inner bottom surface of the outer case 3 so that light generated from the light source 1 can be concentrated to the display unit side of the liquid crystal display panel so as to maximize light utilization efficiency. .

On the other hand, since there is considerable space between the light source 1 and the diffuser plate 5a, the diffuser plate 5a is convexly sag in the gravity direction due to its own mass or heat generated by the light source 1. Phenomenon occurs.

In order to prevent this phenomenon, the conventional backlight assembly is provided with a plurality of lamp guides 10 to prevent sagging of the diffuser plate 5a between the diffuser plate 5a and the reflective sheet 7. .

The lamp guide 10 is installed on the bottom surface of the outer case (3), the support (10a) of the lamp guide 10 has a truncated truncated conical shape as it proceeds toward the diffusion plate (5a), Figure 2 As shown in, the support 10a supports a portion of the diffuser plate 5a to the top of the truncated cone to prevent sagging of the diffuser plate 5a.

In addition, both sides of the support (10a) formed in the lamp guide 10 is formed with a C-shaped fixing groove (10b) is inserted into each light source 1 is fixed to prevent the flow of each light source (1) have.

Of course, each of the light sources 1 is supported by the holder 6 described above, but since each of the light sources 1 is long, the central portion of the light source 1 is easily flowed by an external impact or the like. Since it may be damaged by using the fixing groove (10b) of the lamp guide 10 as described above to prevent this.

The lamp guide 10 is installed after the light source 1 and the holder 6 are assembled inside the outer case 3, but first, an inner bottom surface of the outer case 3 (substantially, a reflector plate) 7) is applied to the adhesive, and as shown in Figure 2a, the lamp guide 10 is rotated so that the fixing groove (10b) toward the end of the light source (1), respectively; Contact with the adhesive formed on the bottom surface between each light source 1.

The reason why the lamp guide 10 is rotated is to avoid interference between the light source 1 and the fixing groove 10b of the lamp guide 10.

Subsequently, as shown in FIG. 2B, when the lamp guide 10 is rotated to its original state, the fixing grooves 10b formed at both sides of the lamp guide 10 are in close contact with the lower portions of the light sources 1. It is combined with each of the light sources (1).

On the other hand, the lamp guide 10 has a problem that the assembly process is cumbersome and time-consuming because the operator must go through the process of fixing using an adhesive or the like.

In addition, since the end portion of the support 10a of the lamp guide 10 is sharply formed, foreign materials or scratches may occur due to friction at the contact surface between the diffusion plate 5a and the support 10a. The foreign matter and scratches eventually affect the display surface of the liquid crystal display panel, causing a defect in the image.

In addition, when the external impact is severe, the end of the support (10a) is broken or deformed can not perform a function.

That is, the deflection of the diffusion plate 5a may not be prevented properly, and thus, the diffusion plate 5a may not properly scatter and diffuse the light transmitted from the light source 1. The problem of deterioration of image quality occurs.

The present invention has been made to solve the above problems, by using a lamp guide having a plurality of insertion holes that have elasticity and each light source can be inserted, fixing each light source using the elasticity of the lamp guide The purpose of the present invention is to provide a backlight assembly capable of preventing damage due to the flow of the light source, and to prevent sagging and scratching of the diffusion plate, and an assembly method thereof.

A backlight assembly according to the present invention for achieving the above object comprises: a plurality of light sources arranged in parallel to emit light; An outer case accommodating the plurality of light sources and having fastening holes formed at both sides thereof; Each of the light sources has an insertion hole is inserted into the end of the outer case is fastened to both ends and the lamp guide is characterized in that it comprises a lamp guide connected in a row in order to fix the respective light sources in a direction perpendicular to the longitudinal direction of the light source It is done.

Here, hooks are formed at both ends of the lamp guide so that both ends are fastened to the fastening holes of the outer case.

The lamp guide is made of a transparent material having elasticity.

A diffusion plate for scattering and diffusing the light emitted from the light source is further provided on the plurality of light sources.

The upper portion of the diffusion plate is characterized in that the polarizing film is further provided by receiving the light uniformly diffused from the diffusion plate to increase the brightness of the light emitted.

Both ends of the light source is characterized in that the lamp holder is further provided for supporting the light source to be aligned in the correct position in the outer case.

The inner bottom surface of the outer case is further characterized in that the reflection plate for reflecting the light emitted from the light source to the display unit side of the liquid crystal display panel.

In addition, the assembly method of the backlight assembly according to the present invention is provided with a plurality of insertion holes made of an elastic material, the light source is provided in each insertion hole of the lamp guide having a hook at both ends of the plurality of insertion holes. Inserting; Fixing both ends of the light source in which the lamp guide is inserted into a lamp holder; Storing the lamp holder in an outer case having fastening holes formed at both sides thereof; And pulling the hooks formed at both ends of the lamp guide to fix the plurality of light sources and fastening the hooks to the fastening holes of the outer case.

Here, the step of assembling the diffusion plate and the polarizing film in order to be located above the plurality of light sources, the outer case is characterized in that it further comprises.

Hereinafter, a backlight assembly according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic perspective view of a backlight assembly according to an exemplary embodiment of the present invention, and FIGS. 4A and 4B are cross-sectional views taken along line II of FIG. 3.

In the backlight assembly according to the embodiment of the present invention, as shown in FIG. 3, a plurality of light sources arranged in parallel with a predetermined interval on the rear surface of the liquid crystal display panel to emit light toward the display unit of the liquid crystal display panel. (111), a lamp holder (116) to which both ends of each light source (111) are connected, and an outer case (113) in which the lamp holder (116) and the light source (111) are accommodated; A reflection plate 117 formed on an inner bottom surface of the outer case 113 to reflect light emitted from each light source 111 toward the display portion of the liquid crystal display panel; In order to prevent damage to each light source 111 due to an impact, a plurality of insertion holes 200a into which each light source 111 is inserted are connected in a line and positioned at the outermost of the plurality of insertion holes 200a. At least one lamp guide 200 having elasticity fixed to both fastening holes 113a of the outer case 113 through the hook 200b formed in the insertion hole 200a.

In addition, a plurality of diffusion plates 115a are disposed on the light sources 111 to scatter and diffuse light emitted from the light sources 111, and are formed on the diffusion plates 115a to form the diffusion plates 115a. The polarizing film 115b is further provided to receive the light uniformly diffused from the light beam to increase the brightness of the light and provide the light to the display unit of the liquid crystal display panel.

In addition, the diffusion plate 115a and the polarizing film 115b are for preventing the shape of the light source 111 from appearing on the display surface of the liquid crystal display panel and providing light having a uniform brightness distribution as a whole. In order to enhance the scattering effect, a plurality of light sources may be disposed between the light source 111 and the liquid crystal display panel.

In this case, the light source 111 generally uses a cold cathode fluorescent lamp (CCFL), and electrodes are disposed at both ends of a tube to emit light when power is applied to the electrodes.

On the other hand, the lamp guide 200 may pass the light emitted from the light source 111, it is preferable to use an elastic silicone material.

As shown in FIG. 4A, before the lamp guide 200 is fastened to the outer case 113, each of the insertion holes 200a maintains the same circular shape as the cross-sectional shape of the light source 111. 4B, when the hook 200b of the lamp guide 200 is pulled to both sides and fastened to the fastening hole 113a of the outer case 113, the insertion holes 200a are elastic. It is stretched to the left and right by the side, and is reduced up and down to change to an elliptical form.

At this time, the insertion hole 200a is fixed by pressing the light source 111 inserted into the insertion hole 200a in the vertical direction to prevent the flow of the light source 111.

Here, the hook 200b of the lamp guide 200 has a protrusion shape larger than that of the fastening hole 113a, and the fastening hole 113a is contracted by elasticity when the protrusion is fitted into the fastening hole 113a. After passing through, and after passing through the fastening hole (113a) is restored to its original size by elasticity is fastened to the fastening hole (113a).

In addition, the lamp guide 200 also serves to prevent sagging of the diffusion plate 115a and the polarizing film 115b provided on the light source 111.

Here, since the lamp guide 200 is a flat surface and a soft surface having elasticity, the part in contact with the diffusion plate 115a may prevent scratches at the contact portion between the support and the diffusion plate 115a, which is a conventional problem. Can be.

In the exemplary embodiment of the present invention, the use of only one lamp guide has been described. However, two or more lamp guides may be used to further increase the effects of preventing the flow of the light source and sagging of the diffusion plate.

Referring to the assembly method of the backlight assembly according to an embodiment of the present invention configured as described above in detail.

5A to 5C are assembled perspective views illustrating a method of assembling a backlight assembly according to an exemplary embodiment of the present invention.

First, as shown in FIG. 5A, in the state where each light source 111 is inserted into the insertion hole 200a of the lamp guide 200, the lamp guide 200 is pushed to the center of each light source 111. Put it in.

Subsequently, as shown in FIG. 5B, lamp holders 116 are connected to both ends of the respective light sources 111.

Next, as shown in FIG. 5C, the lamp holder 116 in which the light source 111 and the lamp guide 200 are assembled is pushed into the outer case 113.

Thereafter, the two hooks 200b of the lamp guide 200 are pulled and inserted into the fastening holes 113a of the outer case 113 to fix the lamp guide 200 to the outer case 113. At the same time, the light sources 111 are fixed to the insertion holes 200a of the lamp guide 200.

Subsequently, the diffusion plate 115a and the polarizing film 115b are fastened to the inside of the outer case 113 to be positioned above the light source 111.

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.

As described above, the backlight assembly and the assembly method thereof according to the present invention have the following effects.

First, the lamp guide used in the present invention does not need any adhesive, and can fix a plurality of light sources at once, thereby significantly shortening the assembly time of the backlight assembly as compared with the related art.

Second, since the lamp guide of the present invention is a soft silicone material having elasticity in contact with the diffusion plate, it is possible to prevent scratches generated between the conventional support and the diffusion plate.

1 is a perspective view of a direct type backlight assembly of a conventional liquid crystal display device;

2a and 2b is a view for explaining the installation method of a conventional lamp guide

3 is a schematic perspective view of a backlight assembly according to an embodiment of the present invention;

4A and 4B are cross-sectional views taken along line I-I ′ of FIG. 3.

5A to 5C are assembled perspective views illustrating a method of assembling a backlight assembly according to an embodiment of the present invention.

* Explanation of symbols on the main parts of the drawings

111: light source 113: outer case

116: holder 117: reflector

115a: diffuser 115b: polarizing film

200: lamp guide 200a: insertion hole

200b: hook

Claims (9)

A backlight assembly provided on a rear surface of a liquid crystal display panel to provide light to a display unit of the liquid crystal display panel. A plurality of light sources arranged in parallel to emit light; An outer case accommodating the plurality of light sources and having fastening holes formed at both sides thereof; Each of the light sources has an insertion hole is inserted into the end of the outer case is fastened to the fastening hole of the outer case and characterized in that it comprises a lamp guide connected in a line to fix each light source in a direction perpendicular to the longitudinal direction of the light source Back light assembly. The method of claim 1, Back light assembly, characterized in that the hook is formed at both ends of the lamp guide to be fastened to both ends of the fastening hole of the outer case. The method of claim 1, And the lamp guide is made of a transparent material having elasticity. The method of claim 1, And a diffuser plate further disposed above the plurality of light sources to scatter and diffuse light emitted from the light sources. The method of claim 4, wherein And a polarizing film on the upper part of the diffuser plate to receive the light uniformly diffused from the diffuser plate and increase the luminance of the light to emit the light. The method of claim 1, And lamp holders at both ends of each of the light sources for supporting the light sources in the correct position in the outer case. The method of claim 1, The inner bottom surface of the outer case further comprises a reflector for reflecting the light emitted from the light source toward the display portion of the liquid crystal display panel. Inserting a light source into each insertion hole of a lamp guide having a plurality of insertion holes made of an elastic material and having hooks at both ends of the plurality of insertion holes; Fixing both ends of the light source in which the lamp guide is inserted into a lamp holder; Storing the lamp holder in an outer case having fastening holes formed at both sides thereof; And pulling the hooks formed at both ends of the lamp guide to fix the plurality of light sources and fastening the hooks to the fastening holes of the outer case. The method of claim 8, Assembling a diffuser plate and a polarizing film in turn in the outer case in order to be located above the plurality of light sources, characterized in that the assembly further comprises.