KR101721663B1 - Guide panel assembly and assembling method of backlight unit using the same - Google Patents

Abstract

The present invention relates to a guide panel assembly for improving a fastening structure between an optical sheet and a light guide plate to simplify an assembling process of each component while improving optical characteristics, and a method for assembling a backlight device using the guide panel assembly. The guide panel assembly has a rectangular frame shape composed of a horizontal part and a vertical part bent outwardly at an outer end of the horizontal part and having a locking rib projecting downward from the horizontal part while being spaced apart from the vertical part by a predetermined distance A guide panel; An optical sheet having a fastening hole at an edge of a position corresponding to the fastening rib and fastened to an inner surface of the guide panel so that the fastening rib is inserted into the fastening hole; And a light guide plate which is fastened to the inner surface of the guide panel while covering the optical sheet so that the fastening rib is inserted into the fastening hole, the fastening hole being formed at the edge of the position corresponding to the fastening rib.

Description

[0001] Description [0002] GUIDE PANEL ASSEMBLY AND METHOD FOR ASSEMBLING BACKLIGHT DEVICE USING THE SAME [0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit, and more particularly, to a guide panel assembly that improves the fastening structure between an optical sheet and a light guide plate to simplify an assembling process of each component while improving optical characteristics, .

Unlike other display devices, a liquid crystal display (LCD) device, which is a flat display device, can not emit light itself, and therefore an external light source is necessarily required to realize an image . Therefore, the LCD further includes a backlight unit as an external light source in addition to the liquid crystal panel, and the backlight unit uniformly supplies the high brightness light to the liquid crystal panel, thereby realizing a high-quality image.

Thus, the backlight device refers to a surface light source unit installed on the back surface of a liquid crystal panel in order to realize an image of a display device such as an LCD. As a light source of the backlight device, a light emitting diode (LED) is mainly used, and a direct lighting type or an edge lighting type backlight device Respectively. In the direct type backlight device, a point light source is disposed under the diffusion plate, and the light is directly illuminated to the liquid crystal panel through the diffusion plate. In the side light type backlight device, a point light source is disposed on the side of the light guide plate, It is a way to illuminate with light.

FIG. 1 is an exploded perspective view showing a conventional side-type backlight device, and FIG. 2 is an enlarged view showing an optical sheet fastening structure which is a main part of FIG.

1, the side-view backlight device includes a reflective sheet 12, an LED light source 13, a light guide plate 14, and an optical sheet 15 sequentially placed in the cover bottom 11, The guide panel 16 is fastened to the cover bottom 11 to constitute a backlight device. On the upper side of such a backlight device 10, a liquid crystal panel is fastened by a top cover to constitute a liquid crystal display device.

Here, the light guide plate 14 receives light from a plurality of point light sources, and through the total internal reflection, the light exit sheet as a surface light source is a light switching element. The optical sheet 15 condenses and diffuses light emitted from the light guide plate 14, Is a light control sheet for improving the characteristics. The optical sheet 15 is in the form of a very thin sheet or film, and a wing portion 17 having an insertion hole 17a for assembly is protruded from the edge.

In the conventional backlight device 10, the reflection sheet 12 and the light guide plate 14 are sequentially placed inside the cover bottom 11, and a plurality of optical sheets 15 are placed on the upper side of the light guide plate 14 And the guide panel 16 is fastened to the cover bottom 11 and assembled. 2, the optical sheet 15 is fastened to the cover bottom 11 while the wing portion 17 is bent so that the fastening protrusion 11a of the cover bottom 11 is inserted into the fitting hole 16a. And the guide panel 16 presses the wing portion 17 to fix the fastening. Such a backlight device is assembled by a process in which all the optical members (the light guide plate and the plurality of optical sheets) are seated in the cover bottom first and then the guide panel is fastened. Therefore, There is a problem that the time is increased.

In addition, the conventional backlight device 10 is configured such that the guide panel 16, the optical sheet 15, and the light guide plate 14 are sequentially separated and then assembled again when the backlight device is being repaired. At this time, in the process of separating and reassembling the guide panel 16, the optical sheet 15 and the light guide plate 14, foreign substances are generated due to interference of the respective components, and these foreign substances are scattered by the light guide plate 14 and the optical sheet 15, Respectively. As described above, foreign substances introduced between the light guide plate 14 and the optical sheet 15 during the repair process appear as hot spots when the backlight device is driven, resulting in deterioration of optical characteristics, resulting in product defects.

In addition, in the conventional backlight device, scratches due to the interference of the components on the light guide plate 14 and the optical sheet 15 in the process of reassembling the guide panel 16, the optical sheet 15, and the light guide plate 14 And the optical characteristic of the backlight device is also deteriorated by such a scratch.

Korean Patent Laid-Open No. 10-2013-0017868 (filed on May 20, 2013, assembly structure of backlight device)

It is an object of the present invention to provide an assembling structure of a backlight device which can improve a fastening structure between a light guide plate and an optical sheet, simplify an assembling process and reduce a assembling time.

Another object of the present invention is to provide an assembling structure of a backlight device that can be easily separated and reassembled when a backlight unit is repaired, and minimizes the occurrence of foreign substances and scratches during a separation and reassembling process .

According to an aspect of the present invention, there is provided a guide panel assembly for a backlight unit, comprising: a rectangular frame having a horizontal portion and a vertical portion bent outwardly at an outer end of the horizontal portion, And a coupling rib protruding downward from the horizontal portion while being spaced apart from the coupling rib; An optical sheet having a fastening hole at an edge of a position corresponding to the fastening rib and fastened to an inner surface of the guide panel so that the fastening rib is inserted into the fastening hole; And a light guide plate which is fastened to the inner surface of the guide panel while covering the optical sheet so that the fastening rib is inserted into the fastening hole, the fastening hole being formed at the edge of the position corresponding to the fastening rib.

Here, the locking rib may include a latch portion having an end protruding in the lateral direction to prevent the optical sheet from separating from the light guide plate.

The guide panel assembly may further include a seat holder including a vertical coupling portion and a pressing portion extending in the horizontal direction at an end of the coupling portion, And is inserted into a fitting groove formed in a horizontal portion of the guide panel and is fastened.

According to another aspect of the present invention, there is provided a method of assembling a backlight device, the method comprising: (a) assembling a cover bottom module for fastening a reflective sheet and a light source to a cover bottom having a storage space therein; (b) a rectangular frame having a horizontal part and a vertical part bent outwardly at an outer end of the horizontal part, the horizontal part and the vertical part being spaced apart from the vertical part by a predetermined distance, A light guide plate is prepared by providing an optical sheet having a fastening hole at the edge of a position corresponding to the fastening rib and a light guide plate so that the fastening rib is inserted into the fastening hole, A guide panel assembly assembling step of sequentially fastening the guide panel to the inner surface of the guide panel; And (c) assembling the guide panel assembly assembled in the step (b) to the cover bottom in a state where the guide panel assembly is turned upside down.

The step (b) may include preparing a sheet holder including a vertical fastening portion and a horizontally extending pressing portion at an end of the fastening portion, and the fastening portion presses the fastening portion against the horizontal And a seat holder assembly step of inserting the seat holder into the guide groove formed in the guide groove.

In the present invention, the light guide plate and the optical sheet are fastened to the guide panel to form the guide panel and the module, so that the assembling process of the backlight device can be simplified and the assembling time can be shortened.

In addition, since the light guide plate and the optical sheet are separated and reassembled together with the guide panel when repairing the backlight unit, no foreign matter, scratch, or the like is issued and the product is not defective during the repairing process.

1 is an exploded perspective view showing a side-view backlight device according to a conventional technique,
Fig. 2 is an enlarged view showing an optical sheet fastening structure, which is a main part of Fig. 1,
3 is an exploded perspective view showing a side-view backlight device according to an embodiment of the present invention,
FIG. 4 is an assembled cross-sectional view showing an assembling structure of the backlight device of FIG. 3,
FIG. 5 is a process diagram illustrating a process of assembling a guide panel assembly according to an embodiment of the present invention, and FIG.
6 is a process diagram illustrating an assembling process of the backlight device according to the embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is an exploded perspective view illustrating a side-type backlight device according to an embodiment of the present invention, and FIG. 4 is an assembled cross-sectional view illustrating an assembling structure of the backlight device of FIG.

3, the backlight device of the present invention includes a cover bottom 100, a reflective sheet 200 seated inside the cover bottom, an LED light source 300, a light guide plate 400, an optical sheet 500, And a guide panel 600 fastened along the edge of the cover bottom 100 on the upper side of the cover plate 500.

Here, the cover bottom 100 is a hexahedron-shaped housing having an opened upper side, and a storage space for accommodating the respective components therein is formed therein.

The reflective sheet 200 includes a sheet or a film which is disposed under the light guide plate and improves the brightness of the backlight device by re-entering the light leaked to the lower side of the light guide plate 400 into the light guide plate 400,

The LED light source 300 is a light source of the backlight device. A plurality of LED packages are mounted on the substrate at a predetermined interval and disposed on the side of the light guide plate 400 to provide light of the plurality of point light sources into the light guide plate 400.

The light guide plate 400 is a light switching device that receives light from a plurality of point light sources from the LED light source 300 and converts the light into total light through the total internal reflection and emits the light to the upper side. The light guide plate 400 is made of a transparent acrylic resin having a predetermined refractive index and is made of resin such as PMMA (polymethylmethacrylate), PS (poly styrene), MS (meta styrene) or PC (polycarbonate).

The optical sheet 500 improves optical characteristics such as a directivity angle, a luminance and a uniformity with respect to light of a planar light source emitted from the light guide plate 400. The optical sheet 500 includes a prism sheet and a diffusion sheet, and may be composed of a plurality of sheets having various functions.

The guide panel 600 includes a reflective sheet 200 that is fastened to the cover bottom 100 and surrounds the edge of the cover bottom 100 and is disposed between the cover bottom 100 and the guide panel 600, The light guide plate 400, and the optical sheet 500 are fixed. The guide panel 600 is divided into a horizontal portion 610 and a vertical portion 620 by a rectangular frame whose center is opened.

In particular, in the backlight device of the present invention, the guide panel 600 constitutes a guide panel assembly by fixing optical members such as the optical guide sheet 400 and the optical sheet 500. For this purpose, fastening means are formed on the guide panel 600, the light guide plate 400 and the optical sheet 500, respectively.

4, the guide panel 600 includes a horizontal part 610 and a vertical part 620 that is bent and extended vertically at an outer end of the horizontal part 610, Thereby forming a rectangular frame. A locking rib 630 protruding downward is formed on the horizontal portion 610 of the guide panel 600 at a position spaced apart from the vertical portion 620 by a predetermined distance. The fastening ribs 630 may be formed on the frame horizontal portion 610 of the receiving light portion region with respect to the rectangular frame, and may be formed at a predetermined distance along the frame. The light guide plate 400 and the optical sheet 500 are formed with fastening holes 430 and 530 at the edges of the guide panel 600 corresponding to the fastening ribs 630, respectively. At this time, the fastening holes 430 and 530 may be formed in the wing portion where the edge portions of the light guide plate 400 and the optical sheet 500 protrude.

The fastening ribs 630 and the fastening holes 430 and 530 are formed to have a rectangular frame guide panel 600, a rectangular plate-like light guide plate 400 and an optical sheet 500 ) Or a light-incident-side light-receiving portion facing each other. The backlight unit refers to an area in which the light source is not disposed. For example, one side area where the light source is disposed constitutes a light incident part and a remaining three areas constitute a light entrance / exit part with respect to a rectangular backlight device.

The locking rib 630 includes an extended portion 631 protruding downward from the horizontal portion 610 of the guide panel 600 and a locking portion 632 formed by bending the end of the extended portion 631. The extension portion 631 is protruded to have a predetermined length so as to have elasticity in the inward and outward directions. The extended portion 631 is inserted into the fastening holes 430 and 530 of the light guide plate 400 and the optical sheet 500 to be tightened to elastically press the light guide plate 400 and the optical sheet 500 inward, Thereby preventing the optical sheet 500 from flowing. In addition, the extension 631 is pushed outward when the light guide plate 400 is thermally expanded, so that the light guide plate 400 can be thermally expanded smoothly. The hook portion 632 is bent in the horizontal direction at the lower end of the extended portion 631 and hooked to prevent the light guide plate 400 and the optical sheet 500 from being caught and separated from each other.

The coupling ribs 630 of the guide panel 600 are inserted into the coupling holes 430 and 530 of the light guide plate 400 and the optical sheet 500 by the structure described above and the guide panel 600 and the light guide plate 400, The sheet 500 is fastened.

Further, the backlight device of the present invention is further provided with a sheet holder 640 that allows such a fastening structure to be stably fixed. As shown in the figure, the seat holder 640 includes a vertically connecting portion 641 fastened to the guide panel 600 and a pressing portion 642 extending and bent in the horizontal direction at the fastening portion 641. The sheet holder 640 having such a configuration is fastened while being inserted into the guide panel horizontal portion 610 while the fastening portion 641 is inserted into the guide panel horizontal portion 610 while the pressing portion 642 fastens the surface of the light guide plate 400 to the guide panel horizontal portion 610. [ The light guide plate 400 and the optical sheet 500 are fixed to each other. At this time, the horizontal portion 610 of the guide panel 600 is formed with a fitting groove into which the fastening portion 641 of the seat holder 640 is inserted, and the end of the fastening portion 641 of the seat holder 640 is fixed A hook can be formed. The pressing portion 642 of the sheet holder 640 may be provided with an avoidance groove for avoiding the end portion of the fastening rib 630 of the guide panel 600. [

FIG. 5 is a process diagram illustrating a process of assembling a guide panel assembly according to an embodiment of the present invention, and FIG. 6 is a process diagram illustrating a process of assembling the backlight device according to an embodiment of the present invention. In the backlight assembly of the present invention, the guide panel assembly is assembled by fastening the optical sheet 500 and the light guide plate 400 to the guide panel 600, and the guide panel assembly is fastened to the cover bottom Process.

Referring to FIG. 5, a guide panel assembly is assembled by inserting a fastening rib 630 in a fastening hole 530 while preparing a guide panel 600 so that the fastening rib 630 faces upward, as shown in (a) The optical sheet 500 is seated on the inner surface of the guide panel 600 in the vertical direction. After the optical sheet 500 is mounted, the light guide plate 400 is vertically seated so that the coupling ribs 630 are inserted into the coupling holes 430 again. The sheet holder 640 is fastened to the guide panel 600 so that the fastening of the optical sheet 500 and the light guide plate 400 can be fixed. At this time, the pushing portion 642 of the sheet holder 640 presses the upper surface of the light guide plate 400 as shown in (b), and the assembling of the guide panel assembly is completed.

Referring to FIG. 6, the backlight unit is assembled by preparing a cover bottom 100 on which a reflective sheet 200 is placed, and a guide panel assembly assembled by the process of FIG. 5, as shown in FIG. At this time, the guide panel assembly is assembled in an inverted state such that the light guide plate 400 is positioned on the lower side, and the vertical side wall 120 of the cover bottom 100 and the vertical portion 620 of the guide panel 600 , The guide panel assembly is fastened to the cover bottom 100, thereby completing the assembly of the backlight device.

As described above, in the backlight device of the present invention, the light guide plate, the optical sheet, and the guide panel constitute an integral assembly and are fastened to the cover bottom, so that the backlight device can be easily assembled. Further, since the optical sheet and the light guide plate are separated at the time of detaching the guide panel for repairing the backlight unit, foreign matter is not interposed between the light guide plate and the optical sheet, thereby minimizing defects generated during the repair process.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

100: cover bottom 120: vertical side wall
200: reflective sheet 300: LED light source
400: light guide plate 500: optical sheet
430, 530: fastening holes
600: Guide panel
610: horizontal part 620: vertical part
630: fastening rib 640: seat holder

Claims (5)

A guide panel having a rectangular horizontal frame portion and a vertical portion bent outwardly at an outer end portion of the horizontal portion and having a locking rib projecting downward from the horizontal portion while being spaced apart from the vertical portion by a predetermined distance;
An optical sheet which is fastened to an inner surface of the guide panel so that the fastening rib is inserted into the fastening hole, the fastening hole being formed at the edge of the fastening rib;
A light guide plate which is fastened to the inner surface of the guide panel while covering the optical sheet so that the fastening rib is inserted into the fastening hole, the fastening hole being formed at the edge wing portion corresponding to the fastening rib; And
And the fastening portion is inserted and assembled into a fitting groove formed in a horizontal portion of the guide panel so that the pressing portion presses the blade portion of the light guide plate A sheet holder,
Wherein the light guide plate and the optical sheet are configured to fix the wings of the light guide plate to the guide panel while being pressed by the seat holder. The connector according to claim 1,
And a latching part having an end protruding in a lateral direction to prevent the optical sheet and the light guide plate from being separated from each other. delete (a) a cover bottom module assembling step of fastening a light source to a cover bottom having a storage space therein,
(b) separate from the step (a)
(b1) a guide panel including a horizontal part and a vertical part bent outwardly at an outer end of the horizontal part and having a rectangular frame shape and spaced apart from the vertical part by a predetermined distance and projecting downwardly from the horizontal part Preparing an optical sheet and a light guide plate having a fastening hole formed in an edge wing portion corresponding to the fastening rib and fastening the optical sheet and the light guide plate to the inner surface of the guide panel sequentially so that the fastening rib is inserted into the fastening hole; ; Wow,
(b2) a sheet holder comprising a vertical fastening portion and a horizontal pressing portion extending from an end of the fastening portion, and the fastening portion presses the wing portion of the light guide plate, Fixing the light guide plate and the optical sheet to the guide panel by inserting the sheet holder into the guide panel and inserting the sheet holder into the guide panel;
A guide panel assembly assembling step of assembling the guide panel assembly; And
(c) a cover bottom and a guide panel assembling step of fastening the cover bottom module of the step (a) and the guide panel assembly of the step (b).
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