KR20220007794A - Guide block and Backlight unit with the same - Google Patents

Abstract

The present invention relates to a guide block for assembling a backlight unit and a backlight unit including the same. The guide block for assembling the backlight unit of one embodiment of the present invention is intervened between a cover bottom and guide panel of the backlight unit to guide assembly of the cover bottom and guide panel. The guide block comprises: a horizontal settling unit; a vertical guide unit extended upwards from an edge part of the horizontal settling unit; a first fastening means formed in the horizontal settling unit and fastened to a bottom unit of the cover bottom; and a second fastening unit formed on an outer surface of the vertical guide unit and fastened to a block fastening unit of the guide panel.

Description

Guide block for assembling a backlight unit and a backlight unit including the same

The present invention discloses a guide block for assembling a backlight unit and a backlight unit including the same.

In general, a display device is a device that receives and displays an image signal, and includes a TV or a monitor, and as a means for displaying an image, a liquid crystal display device (LCD), an organic light emitting device (OLED) Various devices such as emitting display) and plasma display panel (PDP) are being used.

Unlike other display devices, LCD does not emit light by itself, and thus requires a separate external light source to realize high-quality images. Therefore, the LCD further includes a backlight unit of a surface light source in addition to the liquid crystal panel, and the backlight unit uniformly supplies a high-brightness light source to the liquid crystal panel to realize an image. As described above, the backlight unit refers to a surface lighting device for realizing an image of a display device such as an LCD, and is classified into a direct lighting type or an edge lighting type backlight unit according to a location where a light source is disposed. As a light source of the backlight unit, a light emitting diode (light emitting diode, hereinafter referred to as 'LED') having advantages such as small size, low power consumption, and high reliability is mainly used.

FIG. 1 is an exploded perspective view showing a side-type backlight unit according to the prior art, and FIG. 2 is a combined cross-sectional view in the I-I direction showing the light carrying-in area, which is the main part of FIG. 1 .

As shown in FIG. 1 , in the side-type backlight unit, a reflective sheet 2 and a light guide plate 3 are seated on a square-shaped cover bottom 1 , and at least one side of the light guide plate 3 has a light source module 4 . This constitutes an arrangement structure. In addition, in the backlight unit, the optical sheet 5 is laminated on the upper surface of the light guide plate 3 , and the guide panel 6 is fastened to the cover bottom 1 on the upper side thereof.

In general, a lot of heat is generated in the light source module 4 when the backlight unit is driven, and this heat may be transferred to the light guide plate 3 . In addition, the light emitted from the light source module 4 proceeds while repeating total reflection inside the light guide plate 3 , and even in this process, heat is generated inside the light guide plate 3 . Since the light guide plate 3 is made of a resin material such as polymethylmethacrylate (PMMA), such heat expands the light guide plate 3 .

Since the thermal expansion of the light guide plate 3 causes the flow of the light guide plate and changes the light properties as a surface light source, the side-type backlight unit further includes a light guide plate holder 7 to prevent the light guide plate 3 from moving due to thermal expansion. do. The light guide plate holder 7 is made of a silicone material having elasticity, and is fixed to the cover bottom 1 in the light carrying-in area to support the light guide plate.

As shown in FIG. 2 , the light guide plate holder 7 may be coupled to the edge or corner region of the cover bottom 1 using a double-sided tape and an adhesive member 8 . That is, in the conventional backlight unit, the light guide plate holder 7 is fastened inside the cover bottom 1 , and the guide panel 6 is fastened outside the cover bottom 1 .

Accordingly, since the cover bottom 1 must have a vertical sidewall 1a for fastening them, the conventional backlight unit increases material cost and increases the bezel width corresponding to the thickness of the vertical sidewall 1a. There is a problem that brings

In addition, in the conventional backlight unit, a sheet fixing structure (not shown) for fixing the optical sheet 5 is formed on the cover bottom 1, and it is difficult to manufacture and process the cover bottom according to the formation of the sheet fixing structure, There is a disadvantage in that the assembly process of the backlight unit is difficult.

Korean Patent Registration No. 10-1835116 (Registered on February 27, 2018)

The present invention has been proposed to solve the above problems, and provides a guide block for assembling a backlight unit capable of reducing manufacturing costs by simplifying the structure of a cover bottom, and simplifying processing and assembly processes, and a backlight unit including the same will do

Another object of the present invention is to provide a guide block for assembling a backlight unit capable of reducing a bezel width by removing a vertical fastening part of a cover bottom, and a backlight unit including the same.

The guide block for assembling the backlight unit of this embodiment for solving the above problems is interposed between the cover bottom of the backlight unit and the guide panel to guide their assembly, and the horizontal seating part, at the edge end of the horizontal seating part A vertical guide part extending upward, a first fastening means formed in the horizontal seating part and fastened to the bottom of the cover bottom, and a first fastening means formed on the outer surface of the vertical guide part and fastened to the block fastening part of the guide panel 2 includes fastening means.

In the guide block of this embodiment, the horizontal guide part includes first and second edges adjacent to each other, and the vertical guide part extends upwardly from the ends of the first edge and the second edge and is adjacent to each other. It may include a guide part and a second vertical guide part.

In addition, in the guide block of the present embodiment, it may further include an elastic guide portion extending inwardly bent from one end of the vertical guide portion.

In addition, in the guide block of this embodiment, the guide block may be made of a silicon or plastic material.

In addition, in the guide block of this embodiment, the first fastening means and the second fastening means may be composed of fastening protrusions corresponding to fastening holes formed in the bottom of the cover bottom and the block fastening part of the guide panel. .

And the backlight unit of this embodiment for solving the above problems, a cover bottom comprising a plate-shaped bottom portion, a light source coupling portion in which the edge of the bottom portion of the light incident region extends upward, and a bottom portion of the cover bottom It consists of an optical member to be seated, a light source module disposed on the side of the light guide plate constituting the optical member in the light incident region, a panel seat for guiding the mounting of the liquid crystal panel, and a block fastening part extending downward from the outer end of the panel seat. a guide panel disposed on the optical member, and a guide block disposed between the cover bottom and the guide panel along a light-in part region to fasten the cover bottom and the guide panel to a lower surface and an outer surface, respectively.

In the backlight unit of this embodiment, the guide block includes a horizontal seating part on which an end of the optical member is seated, a vertical guide part extending upwardly from an edge end of the horizontal seating part, and the horizontal seating part. It may include a first fastening means fastened to the bottom of the cover bottom, and a second fastening means formed on an outer surface of the vertical guide part and fastened to the block fastening part of the guide panel.

The backlight unit of the present invention has the effect of simplifying the structure, reducing the manufacturing cost, and simplifying the processing and assembling process by eliminating the vertical fastening part of the cover bottom of the light carrying-in area.

In addition, the backlight unit of the present invention has an advantageous effect in reducing the bezel width because the cover bottom is not interposed between the guide block and the guide panel.

1 is an exploded perspective view showing a side-type backlight unit according to the prior art;
2 is a cross-sectional view showing the backlight unit of FIG. 1;
3 is a cross-sectional view showing a backlight unit according to the present embodiment;
4 is a cross-sectional view showing the backlight unit of FIG. 3;
Figure 5 is a perspective view showing the main part of the guide block of Figure 3;
6 is a perspective view showing another example of a guide block for assembling a backlight unit according to the present embodiment;
7 is a perspective view illustrating another example of a guide block for assembling a backlight unit according to the present embodiment.

The present invention and the technical problems achieved by the practice of the present invention will be made clear by the preferred embodiments described below. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It should be understood that the differences between the embodiments described below are not mutually exclusive. That is, without departing from the spirit and scope of the present invention, the specific shapes, structures and characteristics described may be implemented in other embodiments with respect to one embodiment, and the location of individual components within each disclosed embodiment Alternatively, it should be understood that the arrangement may be changed, and similar reference numerals in the drawings refer to the same or similar functions over several aspects, and the length, area, thickness, and the like may be exaggerated for convenience. In the description of this embodiment, top, bottom. Expressions such as left, right, first, second, etc. indicate relative positions, directions, and sequences, and their technical meanings are not limited by dictionary meanings. In addition, in the description of the present embodiment, horizontal or vertical includes a range close to 0° or 90° meaning absolute 0° or 90°.

3 is a cross-sectional view illustrating the backlight unit according to the present embodiment, FIG. 4 is a cross-sectional view in the II-II direction showing the backlight unit of FIG. 3, and FIG. 5 is a perspective view illustrating a guide block which is a main part of FIG.

Referring to these drawings, the backlight unit of this embodiment includes a cover bottom 100 forming a receiving space therein, a reflective sheet 200 sequentially seated in the receiving space of the cover bottom, a light guide plate 300, and an optical The sheet 400, the light source module 500 disposed on at least one side of the light guide plate, the guide panel 600 disposed on the upper side of the optical sheet on the upper side of the cover bottom, and between the cover bottom and the guide panel along the area of the light carrying-in part It includes a guide block (700, guide block) disposed on.

Specifically, the cover bottom 100 forms a rear housing of the backlight unit while accommodating optical members such as the reflective sheet 200 , the light guide plate 300 , the optical sheet 400 , and the light source module 500 therein. The cover bottom 100 is composed of a plate-shaped rectangular plate, and a light source coupling part 120 with an edge of the bottom part 110 extending upward is formed in the light incident part area, and the light input part area is the bottom part 110 . A plurality of first fastening holes 130 to which the guide block 700 is fastened are formed on the edge while being composed only of In the description of the present embodiment, the light incident region refers to an edge region of one side on which the light source module is disposed within the cover bottom, and the light incident region refers to the remaining edge region.

The reflective sheet 200 is configured to improve the brightness of the backlight unit by reflecting the light emitted downward from the light guide plate 300 into the light guide plate 300 . The reflective sheet 200 may be made of a metal sheet having excellent light reflectance or a sheet having a light reflective material such as Ag coated on the surface.

The light guide plate 300 is a light conversion element that converts light from a plurality of point light sources incident from the light source module 500 into a surface light source through total internal reflection and provides the light to a liquid crystal panel (not shown). The light guide plate 130 is made of a transparent acrylic resin having a predetermined refractive index. can

The optical sheet 400 condenses and diffuses light emitted from the light guide plate 300 to improve luminance and luminance uniformity of the backlight unit. The optical sheet 400 may be composed of a plurality of light control sheets including a prism sheet and a diffusion sheet.

The light source module 500 is a light emitting source of a backlight unit that provides light to the inside of the light guide plate 300 , and may be configured as an LED array in which a plurality of LEDs are mounted on a substrate. The light source module 500 is disposed on one side of the light guide plate 300 to constitute a light incident part. The light source module 500 may be adhered to the light source fastening part 120 of the cover bottom 100 through a double-sided tape having excellent thermal conductivity, or may be fastened by a screw or the like.

The guide panel 600 is configured to press and fix the reflective sheet 200, the light guide plate 300, the light source module 500 and the optical sheet 400 accommodated in the cover bottom 100, and guide the assembly of the liquid crystal panel. As a result, it may be composed of a rectangular flange with an open center. The guide panel 600 is fastened to the guide block 700 while protecting various parts from external impact and pressing and fixing them.

For this, the guide panel 600 includes a horizontal panel seating part 610 that provides a liquid crystal panel seating surface, and a vertical block extending downward from the outer end of the panel seating part 610 and fastened to the guide block 700 . It includes a fastening part 620 . In addition, a plurality of second fastening holes 630 for fastening the guide block 700 are formed in the block fastening part 620 of the guide panel 600 .

The guide block 700 seats the optical members including the reflective sheet 200, the light guide plate 300, and the optical sheet 400 and prevents their flow, and at the same time, the cover bottom 100 and the guide panel 600 guide the fastening. The guide block 700 may be made of a plastic or silicon material, and is disposed at an edge or a corner region of the light-in part of the backlight unit. In addition, a plurality of guide blocks 700 may be disposed at a predetermined interval, and the configuration may be different depending on the location where they are disposed. That is, the configuration of the guide block disposed in the edge region and the guide block disposed in the corner region may be different. In addition, the guide block 700 may be further provided with a flow preventing means for preventing the flow of the optical members if necessary.

More specifically, the guide block 700 includes a horizontal seating part 710 and a vertical guide part 720 extending upward from the outer end of the horizontal seating part 710 . The horizontal seating part 710 guides the assembly of the reflective sheet 200 or the light guide plate 300 by seating the edges of the reflective sheet 200 or the light guide plate 300 as needed, and the vertical guide part 720 includes the reflective sheet 200, the light guide plate 300 and By pressing the edge end of the optical sheet 400 to guide their assembly and prevent flow.

In addition, the guide block 700 forms a first fastening protrusion 730 for fastening with the cover bottom 100 on the lower surface of the horizontal seating part 710 . The first fastening protrusion 730 may be configured as a hook-shaped protrusion, and is press-fitted into the first fastening hole 130 formed in the bottom 110 of the cover bottom 100 , the guide block 700 and the cover Assemble the bottom 100 . Although the present embodiment illustrates a configuration in which a fastening protrusion is formed in the guide block 700 and a fastening hole is formed in the cover bottom 100 , these are a pair of fastening means corresponding to each other, and the fastening hole in the guide block 700 is provided. is formed, and a fastening protrusion may be formed on the cover bottom 100 . In addition, fastening using a screw or the like may be applied as a means for fastening the horizontal seating portion 710 of the guide block 700 and the bottom portion 100 of the cover bottom 100 .

In addition, the guide block 700 forms a second fastening protrusion 740 to be fastened to the guide panel 600 on the outer surface of the vertical guide unit 720 . The second fastening protrusion 740 is press-fitted into the second fastening hole 630 formed in the block fastening part 620 of the guide panel 600 to assemble the guide block 700 and the guide panel 600 . Although the present embodiment illustrates a configuration in which a fastening protrusion is formed in the guide block 700 and a fastening hole is formed in the guide panel 600, these are a pair of fastening means corresponding to each other, and the fastening hole in the guide block 700 is provided. is formed, and a fastening protrusion may be formed on the guide panel 600 . In addition, fastening using a screw or the like may be applied as a means for fastening the vertical guide part 720 of the guide block 700 and the block fastening part 620 of the guide panel 600 .

The backlight unit having the above configuration prevents the flow of the guide block 700 while guiding the assembly of the optical members, and at the same time guides their assembly between the cover bottom 100 and the guide panel 600 . Therefore, since the cover bottom 100 does not have a separate fastening means or vertical side wall for fastening to the guide panel 600 , the structure can be simplified and manufacturing costs can be reduced, and the guide block 700 and the guide panel 600 are not provided. ), since the cover bottom 100 is not interposed therebetween, there is an advantageous effect in reducing the bezel width.

6 and 7 are perspective views illustrating various other examples of a guide block for assembling a backlight unit according to the present embodiment.

First, referring to FIG. 6 , the guide block 700 forms an 'L' shape in which the vertical guide parts 720 are orthogonal to each other. That is, the horizontal seating part 710 of the guide block 700 includes first and second edges adjacent to each other, and the vertical guide part 720 includes first edges on both sides of the horizontal seating part 710 adjacent to each other. and a first vertical guide portion and a second vertical guide portion extending upwardly from the second edge end in an 'L' shape and adjacent to each other. The guide block 700 may be disposed in the corner region of the backlight unit to guide the coupling of the cover bottom 100 and the guide panel 600 . In this case, second fastening protrusions 740 may be formed on the outer surfaces of each vertical guide part 720 adjacent to each other.

In addition, referring to FIG. 7 , in the guide block 700 , the elastic guide part 750 is formed inside the vertical guide part 720 . That is, one end of the vertical guide part 720 is formed with an elastic guide part 750 extending while being bent inward, and the elastic guide part 750 is spaced apart from the vertical guide part 720 by a predetermined distance while being spaced apart from the vertical guide part ( 720) as the axis, elastic deformation is made in the horizontal direction. The elastic guide part 750 may elastically support the outer end of the light guide plate 300 or the optical sheet 400 to prevent their flow due to thermal expansion. The elastic guide part 750 is preferably provided when the guide block 700 is made of a plastic material.

As described above, although exemplary embodiments of the present invention have been illustrated and described, various modifications and other embodiments may be made by those skilled in the art. All such modifications and other embodiments are intended to be contemplated and included in the appended claims without departing from the true spirit and scope of the present invention.

100: cover bottom 110: bottom
120: light source fastening unit 130: first fastening hole
200: reflective sheet
300: light guide plate
400: optical sheet
500: light source module
600: guide panel 610: panel seating part
620: block fastening part 630: second fastening hole
700: guide block 710: horizontal seating part
720: vertical guide part 730: first fastening protrusion
740: second fastening protrusion 750: elastic guide part

Claims (7)

Interposed between the cover bottom of the backlight unit and the guide panel to guide their assembly,
horizontal seat;
a vertical guide portion extending upwardly from an edge end of the horizontal seating portion;
first fastening means formed on the horizontal seating part and fastened to the bottom part of the cover bottom; and
A guide block for assembling a backlight unit comprising a; second fastening means formed on the outer surface of the vertical guide part and fastened to the block fastening part of the guide panel. The method of claim 1,
The horizontal guide portion comprises a first edge and a second edge adjacent to,
The vertical guide part includes a first vertical guide part and a second vertical guide part extending upward from the ends of the first edge and the second edge and adjoining each other, a guide block for assembling a backlight unit. The method of claim 1,
A guide block for assembling a backlight unit further comprising a; an elastic guide portion bent inwardly extending from one end of the vertical guide portion. 4. The method according to any one of claims 1 to 3,
The guide block is made of a silicon or plastic material, a guide block for assembling a backlight unit. 4. The method according to any one of claims 1 to 3,
A guide block for assembling a backlight unit, wherein the first fastening means and the second fastening means are configured with fastening protrusions corresponding to fastening holes formed at the bottom of the cover bottom and at the block fastening part of the guide panel. a cover bottom comprising a plate-shaped bottom and a light source coupling part having an edge of the bottom of the light incident region extending upward;
an optical member seated on the bottom of the cover bottom;
a light source module disposed on the side of the light guide plate constituting the optical member in the light incident region;
a guide panel comprising: a panel seating part for guiding the seating of the liquid crystal panel; and a block coupling part extending downward from the outer end of the panel seating part; and
A backlight unit comprising a; a guide block disposed between the cover bottom and the guide panel along an area of the light carrying-in portion to fasten the cover bottom and the guide panel to a lower surface and an outer surface, respectively. 7. The method of claim 6,
The guide block includes a horizontal seating part on which an end of the optical member is seated, a vertical guide part extending upwardly from an edge end of the horizontal seating part, and the horizontal seating part is formed in the horizontal seating part to be fastened with the bottom of the cover bottom A backlight unit comprising: a first fastening means; and a second fastening means formed on an outer surface of the vertical guide part and fastened to the block fastening part of the guide panel.

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