KR20050117021A - Lamp housing and back light assemble using thereof - Google Patents

Abstract

The present invention is formed by bending at least one edge of the upper or lower side of the other facing along the longitudinal direction so that the light emitted from the fluorescent lamp toward one side by bending along the fold line, at least one of the other direction and the upper or lower of the fluorescent lamp It is made of a non-thick sheet of thickness T surrounding the direction, the t '(t, t> t') depth groove is formed from the outer surface along each fold line, the at least one edge is bent based on this Provided are a lamp housing and a backlight assembly for a liquid crystal display device using the same.

The lamp housing according to the present invention can maintain the bent state of the shape through the incision groove while the incision groove is not exposed to the inner surface facing the fluorescent lamp can concentrate the light at a uniform brightness, the general case and On the other hand, there is an advantage of preventing spots caused by uneven brightness at the bottom of the screen.

Description

Lamp housing and back light assembly for liquid crystal display using the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp housing and a back light assembly for a liquid crystal display device using the same, and more particularly, to fabricate a non-metallic sheet in a predetermined form so that light emitted from a fluorescent lamp is concentrated to one side. It relates to a lamp housing and a backlight assembly for a liquid crystal display device using the same.

In recent years, as the society enters the information age, the display field that processes and displays a large amount of information has been rapidly developed, and recently, the thin film transistor (Thin) having excellent performance of thinning, light weight, and low power consumption has recently been developed. Film Transistor (TFT) type liquid crystal display (TFT-LCD) has been developed to replace the existing cathode ray tube (CRT).

The image realization principle of the liquid crystal display device uses the optical anisotropy and polarization property of the liquid crystal. As is well known, the liquid crystal has a thin and long molecular structure and optical anisotropy having an orientation in an array, and when placed in an electric field, the liquid crystal has an orientation of molecular arrangement depending on its size. This change is polarized. The liquid crystal display device is a liquid crystal panel composed of a pair of transparent insulating substrates each having a field generating electrode formed thereon and facing each other with a liquid crystal layer interposed therebetween as an essential component. Various images are displayed by artificially adjusting the alignment direction of the liquid crystal molecules and changing the transmittance of light.

On the other hand, the liquid crystal panel described above requires a separate light source because it is a light-receiving element that does not have its own light emitting element. To this end, a backlight assembly having a fluorescent lamp is provided on the back of the liquid crystal panel to supply light. By this, an image of the identifiable luminance is displayed.

In general, the liquid crystal display device is modularized by using various mechanical elements to prevent the loss of light with the protection of the liquid crystal panel and the backlight assembly, Figure 1 is an exploded perspective view of a general liquid crystal display module of the synthetic resin The backlight assembly 20 and the liquid crystal panel 30 are sequentially coupled to the upper surface of the support main shape (main main) 10 formed of a mold, and the shape change prevention of the support main 10 and the fluorescent lamp to be described later Cover bottom (40) is coupled to the back of the support main (10) for the protection of (24), and a top cover (edge) that borders the edge of the liquid crystal panel 30 so as to fix them all. ) Is assembled and fastened to the support main 10 and the cover bottom 40.

At this time, along the at least one side of the liquid crystal panel 30, the driving circuit 34 is connected via a flexible printed circuit board 32 to support the back of the support main 10 or cover bottom 40 in the modularization process. Tuck it up and stick it.

In addition, the backlight assembly 20 includes a white or silver reflective sheet 22 interposed on the upper surface of the support main 10, and a fluorescent lamp arranged along the length direction of at least one edge 12 of the support main 10. And a light guide panel 26 having a predetermined thickness seated on the reflective sheet 22 so as to occupy the same plane position, a prism sheet and a diffuser sheet covering the light guide plate 26. a plurality of optical sheets 28, such as diffuse sheets.

In addition, the general backlight assembly 20 is provided with a lamp housing 29 surrounding the upper and lower sides of the fluorescent lamp 24 with the inner surface facing the light emitted from the fluorescent lamp 24 concentrated on the light guide plate 26 side. The support main 10 is interposed along at least one edge 12 in the longitudinal direction, and the light emitted from the fluorescent lamp 24 is incident on the light guide plate 26 side by the lamp housing 29 to the liquid crystal panel 30. After being refracted by the laser beam, the light is processed into a high quality of uniform luminance while being passed through the plurality of optical sheets 28 and irradiated onto the liquid crystal panel 30.

In this case, as shown in the support main 10, one edge 12 on which the fluorescent lamp 24 is mounted may be opened, and in this case, the edges of the cover bottom 40 corresponding to the corresponding portions are upward and inward. It is bent in two stages to form a bending portion 48, the fluorescent lamp 24 and the lamp housing is mounted along the length of the bending portion 48.

On the other hand, in the above description, the lamp housing 29 is usually made of a metal sheet or a non-metallic plastic sheet, etc. In the case of metal, since the workability is excellent, it can be easily manufactured in a corresponding shape by using a separate bending machine, etc. In the case of the sheet, the process of dashing the folded portion is preceded to allow the shape to be fixed in consideration of the restoring force due to its physical properties, and then the sheet is bent into the corresponding shape.

2 is an exploded view showing an unfolded lamp housing 29 made of a non-metallic plastic sheet, and FIG. 3 is an enlarged view showing an enlarged view of a circle A, which is a part of the lamp housing 29. The upper and lower edges of the fluorescent lamp 24 in the longitudinal direction are shown. As a result, a plurality of fine slit holes 29a are previously drilled in a row to form a folding line, which is then folded and folded to form a corresponding shape, and as a result, a cross section perpendicular to the longitudinal direction so that the inner side toward the light guide plate 26 is opened. The shape of has a substantially c-shape to surround the upper and lower sides of the fluorescent lamp 24.

However, the lamp housing 29 employing a general dotted line cut has some problems. As the liquid crystal display device has recently been developed with high brightness, the dotted cut slit hole 29a pattern of the lamp housing 29 is projected to the outside. To stain the bottom of the screen. That is, in the lamp housing 29 made of the general non-metallic plastic sheet described above, each of the slit holes 29a perforated by the dotted line cutting completely passes through the lamp housing 29, and thus, the slit holes 29a are part of the other parts. Compared with this, the reflection efficiency is significantly lowered, and as a result, the amount of light incident on the light guide plate 26 also shows a partial difference.

This local luminance difference is projected onto the screen and spots appear. Referring to FIG. 4, which shows a part of an image expressed through a liquid crystal display using a general lamp housing 29 as a photograph, a lower portion thereof, that is, a lamp housing It can be seen that the spots due to the luminance difference in the same pattern shape as the slit hole (29a) in the portion close to the.

Accordingly, the present invention is to solve the above problems, while preserving the bending state of the lamp housing made of a non-metallic plastic sheet while preventing the screen stain caused by the conventional dotted line cutting, evenly and evenly light guide plate light emitted from the fluorescent lamp The purpose is to provide a lamp housing that can be focused laterally. In addition, the lamp housing is used to provide a backlight assembly for an LCD having more improved characteristics.

In order to achieve the above object, at least one edge of the other side facing each other along the longitudinal direction thereof is bent along the fold line so that the light emitted from the fluorescent lamp is directed toward one side, and the other side of the fluorescent lamp is formed. And a non-metallic sheet having a thickness of t that surrounds at least one or more directions above and below, wherein an incision groove having a depth of t '(but t> t') is formed from the outer surface along each of the fold lines. One edge is characterized in that each formed bent.

At this time, the lamp housing is characterized in that the upper and lower edges in the longitudinal direction are bent in parallel with each other to wrap the fluorescent lamp in the up and down and the other direction, each of the incision grooves at a certain distance along the fold line A plurality of them are arranged in a line.

In this case, the lamp housing may include a reflective layer on an inner surface facing the fluorescent lamp; A base film of the outer surface at which the incision groove is started; And an intermediate adhesive layer bonding the reflective layer and the base film to each other, wherein the cutout groove has a depth that reaches a portion of the reflective layer as much as possible.

In another aspect, the present invention provides a backlight assembly for a liquid crystal display device having the lamp housing described above, comprising: a reflection sheet; A light guide plate stacked on the reflective sheet; At least one fluorescent lamp mounted on at least one side of the light guide plate in a state in which the lamp housings are mounted; It provides a backlight assembly for a liquid crystal display device comprising a plurality of optical sheets stacked on the light guide plate.

The lamp housing may be integrally formed by bending at least one edge of the reflective sheet facing the respective fluorescent lamps. In this case, the reflective sheet and the lamp housing may include a reflective layer on an inner surface facing the light guide plate and the fluorescent lamp. ; A base film of the outer surface at which the incision groove is started; It characterized in that it comprises an intermediate adhesive layer for bonding the reflective layer and the base film.

And the cutting groove is characterized in that it has a depth that reaches a portion of the maximum reflective layer, the present invention will be described in more detail with reference to the drawings.

5 is an exploded perspective view of the liquid crystal display module according to the present invention, and includes a backlight assembly 120 and a liquid crystal panel 130 on a support main 110 made of a synthetic resin or sustainable mold having a substantially rectangular frame shape. ) Is seated in turn, and the cover cover 140 is coupled to the rear thereof, and the top cover 150 bordering the edge of the liquid crystal panel 130 is fixed to the support main 110 and the cover bottom 140 so as to fix them all. ) Is assembled and fastened.

More specifically, first, the backlight assembly 120 includes a reflective sheet 122 of a white or silver sheet seated on the support main 110 as shown, and an inner length of at least one edge 112 of the support main 110. A fluorescent lamp 124 arranged along a direction, a light guide plate 126 seated on the reflective sheet 122 so as to have a coplanar position with the fluorescent lamp 124, and a plurality of optical sheets interposed thereon. 128, a cold cathode fluorescent lamp may be used as the fluorescent lamp 124, and the plurality of optical sheets 128 include a prism sheet and a diffusion sheet.

In addition, a lamp housing 129 surrounding the upper and / or downward directions at the outside thereof is interposed along the edge 112 of the support main 110 so that the light emitted from the fluorescent lamp 124 is concentrated on the side of the light guide plate 126. For example, the shape of the cross section perpendicular to the longitudinal direction may have a substantially c-shape so as to surround both the upper and lower sides of the fluorescent lamp 124 while the inner surface facing the light guide plate 126 is opened.

Therefore, the light emitted from the fluorescent lamp 124 is concentrated on the light guide plate 126 side by the lamp housing 129 and refracted toward the liquid crystal panel 130. While passing through the sheet 128, it is processed to a high quality of uniform brightness and irradiated to the liquid crystal panel 130.

In this case, the backlight assembly 120 having the above-described structure is commonly referred to as a side light method, and according to the purpose, the backlight assembly 120 fluoresces into the lamp housing 129 which is interposed in the longitudinal direction of at least one edge 112 of the support main 110. A plurality of lamps 124 may be arranged in a plurality of layers. Furthermore, a plurality of sets of lamp housings 129 and fluorescent lamps 124 mounted therein may be provided, respectively, so that both edges of the support main 110 face each other. Therefore, it is also possible to interpose corresponding to each other.

The driving circuit 134 is connected to the liquid crystal panel 130 seated on the backlight assembly 120 via at least one edge of the flexible circuit board 132, and covers the rear surface of the support main 110. The bottom 140 is coupled, and the driving circuit 134 of the liquid crystal panel 130 is folded and adhered to the rear surface of the cover bottom 140 in the modularization process of the LCD.

Next, the top frame 150 having a rectangular frame having an edge bordering the edge of the liquid crystal panel 130 is assembled to the support main 110 and the cover bottom 140 to complete the liquid crystal display device module. 110, as shown, one edge 112 in which the fluorescent lamps 124 are arranged may be opened. In this case, the edge of the cover bottom 140 corresponding to the corresponding portion is bent upward and inward to the inner longitudinal direction. Accordingly, the band housing 148 in which the lamp housing 129 and the fluorescent lamp 124 are mounted may be formed.

Therefore, the bending part 148 acts as a part of the substantial support main 110.

In addition, the cover bottom 140 may also cover a part or the whole of the back surface of the support main 110, although not separately shown in separate drawings, and the fluorescent lamps 124 may face both sides of the support main 110 facing each other. When arranged along the longitudinal direction, in order to protect each of these, it may be provided in a pair of oriental which opposes each other.

Although the above-described configuration is based on general technical details, the present invention shows a big difference in the lamp housing 129, which is manufactured by bending a non-metallic plastic sheet into a corresponding shape. 6 and an enlarged development view of FIG. 7 showing a part of the lamp housing 129 according to the present invention.

As shown, the lamp housing 129 according to the present invention has a form surrounding the upper and lower sides of the lamp housing 129 so that at least one fluorescent lamp 124 is mounted along the inner longitudinal direction, and as a result, the light guide plate 126 The facing inner surface is opened so that the shape of the cross section perpendicular to the longitudinal direction is approximately C-shaped.

The lamp housing 129 has a rectangular non-metallic plastic sheet having a length corresponding to the fluorescent lamp 124, a width smaller than this, and a thickness t, and then bent in the direction parallel to each other in the vertical direction along the longitudinal direction thereof. In the present invention, in particular, along each fold line, an incision groove 129a having a depth less than t is formed from the outer surface of the rear surface of the fluorescent lamp 124, and the shape is completed by bending the upper and lower edges based on this. .

In this case, the incision groove 129a may be formed only in a part of the fold line along the longitudinal direction of the lamp housing 129, and similarly to the dotted cut, a plurality of slit shapes may be arranged in a line at a constant distance, but in any case (129) It is different from the conventional one that only a part is cut from the outer surface without puncturing the whole, and as a result, the cutting groove 129a cannot be found on the inner surface facing the fluorescent lamp 124.

Therefore, the lamp housing 129 of the non-metallic plastic sheet can be easily folded into a desired shape by using the cutaway groove 129a, and the bending state is preserved for a long time, and in particular, the outer surface of the lamp housing 129 is not perforated. Since only up to t 'of a depth smaller than the thickness t of the lamp housing 129 from, unlike the general case, there is no difference in partial reflection efficiency.

Therefore, the light emitted from the fluorescent lamp 124 can be concentrated to the light guide plate 126 side with uniform luminance.

On the other hand, in recent years, as the brightness of the liquid crystal display device increases, the thickness of the light guide plate 126 is increased, or a reflective sheet 122 and a lamp housing 129 having a multilayered layer have been introduced. In this case, the reflective sheet 122 And the lamp housing 129 may be integrally formed.

That is, FIG. 8 is an exploded perspective view of a liquid crystal display module in which the reflective sheet 122 and the lamp housing 129 are integrally formed according to another embodiment of the present invention. The duplicated description is omitted by attaching a reference number, and as a difference, the reflective sheet 122 and the lamp housing 129 may be integrally formed.

That is, by bending the at least one edge of the reflective sheet 122 facing the fluorescent lamp 124 to the upper side and the inner side, respectively, a predetermined region having one side facing the light guide plate 126 may be formed, and the length of the corresponding region As the fluorescent lamp 124 is mounted along the direction, the fluorescent lamp 124 may serve as the lamp housing 129. In this case, the reflective sheet 122 and the lamp housing 129 may be formed of a multilayered sheet of the same material. .

Referring to FIG. 9, which is an enlarged view of part C of FIG. 8, and an enlarged portion of K which is a part thereof, the multilayer sheet constituting the reflective sheet 122 and the lamp housing 129 is illustrated. The layer sheet has a reflective layer 152 having a high reflection efficiency on the inner surface facing the fluorescent lamp 124 and the light guide plate 126, respectively, and a base film 156 bonded to the outer surface with an intermediate adhesive layer 154 interposed therebetween. Has a structure.

In this case, the base film 156 is generally made of a polyester-based opaque white film, and the reflective layer 152 is generally made of at least several to several hundred layers of different refractive indexes, and in this case, a lamp Along the fold line for fabricating the housing 129, a cutout groove 129a is formed to a depth reaching the adhesive layer 154 from the base film 156 on the outer surface.

In this case, the depth of the cutout groove 129a reaches a part of the maximum reflective layer 152 so that the whole of the lamp housing 129 is not perforated. As a result, the cutout groove 129a is disposed on the inner surface facing the fluorescent lamp 124. You will not find a smooth state. Therefore, it can be easily formed so as to be able to serve as a lamp housing 129 by folding at least one edge of the reflective sheet 122, and the bending form is preserved for a long time, in particular, the cut groove 129a is a lamp housing ( 129) Only a part of the maximum reflective layer 152 is reached from the outer surface without perforating the whole, thereby achieving the object of the present invention.

Finally, a brief description of the manufacturing method of the lamp housing 129 according to the present invention, a rectangular non-metallic plastic sheet having a thickness and corresponding to the length of the fluorescent lamp 124 or the other edge corresponding to the fluorescent lamp Prepare an extended multilayer layer sheet. The cutting grooves 129a having a depth t 'smaller than t are formed from the outer surface along the folded portions thereof, and the cutting grooves 129a can be simply completed by turning the cutting grooves 129a outward.

The lamp housing according to the present invention as described above can be easily manufactured by forming the desired shape of the lamp housing by forming the incision groove of a depth smaller than the thickness from the outer surface and then bending it on the basis of course can preserve the bending state for a long time. At the same time, the inner surface toward the fluorescent lamp becomes smooth, and light can be focused on the side of the light guide plate with uniform brightness. Therefore, unlike the slit hole of the dotted line cutting the entire lamp housing as in the general case there is an advantage that can prevent the stain due to uneven brightness at the bottom of the screen.

In addition, since the inner surface of the lamp housing according to the present invention defines a separate space disconnected from the outside, there is an advantage of preventing contamination of the fluorescent lamp and the liquid crystal panel due to the infiltration of foreign matter.

1 is an exploded perspective view of a typical liquid crystal display module.

2 is an exploded view showing a typical lamp housing unfolded;

3 is an enlarged view of a portion A in FIG. 2;

4 is a photograph of a part of an image represented by a general liquid crystal display;

5 is an exploded perspective view of a liquid crystal display module according to the present invention.

FIG. 6 is an enlarged view of part B of FIG. 5; FIG.

7 is an expanded development view of the lamp housing of the liquid crystal display module according to the present invention.

8 is an exploded perspective view of a liquid crystal display module having a lamp housing according to another embodiment of the present invention.

FIG. 9 is an enlarged view of part C of FIG. 8; FIG.

FIG. 10 is a partially enlarged view showing a portion of FIG. 9 unfolded. FIG.

<Description of the symbols for the main parts of the drawings>

110: support main 112: edge

120: backlight assembly 122: reflective sheet

124: fluorescent lamp 126: light guide plate

128: optical sheet 129: lamp housing

129a: incision groove 130: liquid crystal panel

132: flexible circuit board 134: driving circuit

140: cover bottom 148: bending section

150: top cover 152: reflective layer

154: adhesive layer 156: base film

Claims (9)

At least one edge of the upper or lower side facing each other along the longitudinal direction of the light emitted from the fluorescent lamp is bent along the fold line to surround the other direction of the fluorescent lamp and at least one or more of the upper and lower directions. It is made of a non-thick metal sheet of t thickness, the trough (t, t> t ') of the incision groove is formed from the outer surface along the fold line, characterized in that the at least one edge is bent based on this housing. The method of claim 1, The non-metallic sheet is a lamp housing, characterized in that the upper and lower edges in the longitudinal direction are bent in parallel with each other to surround the fluorescent lamp in the vertical direction and the other direction. The method of claim 2, Each of the incision grooves is a lamp housing, characterized in that the plurality is arranged in a line at a predetermined distance along each fold line. The method of any one of claims 1 to 3. The nonmetal sheet may include a reflection layer on an inner surface facing the fluorescent lamp; A base film of the outer surface at which the incision groove is started; Lamp housing comprising an intermediate adhesive layer for bonding the reflective layer and the base film. The method of claim 4, wherein The incision groove has a lamp housing, characterized in that the depth to reach a portion of the reflective layer as much as possible. A backlight assembly for a liquid crystal display device having a lamp housing according to any one of claims 1 to 3, wherein A reflective sheet; A light guide plate stacked on the reflective sheet; At least one fluorescent lamp mounted on at least one side of the light guide plate in a state in which the lamp housings are mounted; And a plurality of optical sheets superimposed on the light guide plate. The method of claim 6, And the lamp housing is integrally formed by bending at least one edge of the reflective sheet facing the respective fluorescent lamps. The method of claim 7, wherein The reflective sheet and the lamp housing may include a reflective layer on an inner surface facing the light guide plate and the fluorescent lamp; A base film of the outer surface at which the incision groove is started; And an adhesive layer interposed between the reflective layer and the base film. The method of claim 8, And the cutout groove has a depth reaching a part of the reflective layer at a maximum.