KR101318750B1 - Backlight unit and liquid crystal display having the same - Google Patents

Abstract

A backlight unit and a liquid crystal display including the same are disclosed.

The backlight unit includes a lamp that generates light; A reflection plate including a coupling hole and reflecting light emitted downward from among the light emitted from the lamp; And a coupling protrusion formed to protrude from the side at a position corresponding to the bottom portion, the side formed to extend from the bottom portion, and the reflecting plate, and storing the lamp and the reflecting plate in a storage space provided by the bottom portion and the side. The protrusion includes a bottom cover which fixes the reflecting plate by being inserted into the coupling hole of the reflecting plate.

Backlight Unit, Reflector, Mating Hole, Bottom Cover, Mating Protrusion

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY HAVING THE SAME}

1 is a cross-sectional view showing a conventional backlight unit.

2 is an exploded perspective view illustrating a backlight unit according to an exemplary embodiment of the present invention.

3 is a cross-sectional view taken along line III-III ′ of FIG. 2.

4 is an exploded perspective view illustrating a liquid crystal display including the backlight unit illustrated in FIG. 2.

FIG. 5 is a cross-sectional view taken along the line VV ′ of FIG. 4.

DESCRIPTION OF THE REFERENCE NUMERALS OF THE DRAWINGS FIG.

100: liquid crystal display 110: backlight unit

120: lamp 130: reflector

132: first reflecting unit 134: second reflecting unit

136: coupling portion 138: coupling hole

140: bottom cover 142: bottom

144: side 146: inner side

148: coupling protrusion 150: diffusion plate

160: optical sheet 170: panel guide

180: liquid crystal panel

The present invention relates to a backlight unit and a liquid crystal display having the same.

As the information technology is developed, the market of display devices, which is a connection medium between users and information, is getting larger. Accordingly, flat panel displays (FPDs) such as liquid crystal displays (LCDs), organic light emitting diodes (OLEDs), and plasma display panels (PDPs) may be used. Usage is increasing. Among them, a liquid crystal display capable of realizing high resolution and capable of miniaturization as well as a large size is widely used.

Generally, a liquid crystal display displays an image using the electro-optical characteristic of a liquid crystal.

To this end, the liquid crystal display may include a liquid crystal panel and a backlight unit.

The liquid crystal panel is disposed above the backlight unit, and displays an image using light provided from the backlight unit.

1 is a cross-sectional view showing a conventional backlight unit.

Referring to FIG. 1, in the conventional backlight unit 10, the backlight unit 10 may provide light to the liquid crystal panel.

To this end, the backlight unit 10 may include a lamp 20, a reflector 30, and a bottom cover 40. In addition, the backlight unit 10 may further include a diffusion plate 50, an optical sheet 60, and a panel guide 70.

The lamp 20 may be driven by receiving power from the outside and may generate light.

The reflector 30 may reflect upwardly the light emitted downward from the light emitted from the lamp 20.

The bottom cover 40 may accommodate the lamp 20 and the reflecting plate 30 and fix the reflecting plate 130.

To this end, the bottom cover 40 may include a bottom portion 42 and a side portion 44.

The side portion 44 may be formed to extend from the bottom portion 42. In this case, an accommodation space may be provided due to the bottom portion 42 and the side portion 44, and the lamp 20 and the reflection plate 30 may be stored in the accommodation space.

The diffusion plate 50 may be seated on the side portion 44 of the bottom cover 40, and may diffuse light to be emitted upward through itself to prevent the shape of the lamp 20 from appearing.

The optical sheet 60 may be mounted on the diffuser plate 50, and may improve luminance and luminance uniformity of light emitted through the diffuser plate 50.

When the impact is applied to the backlight unit 10 from the outside in the conventional backlight unit 10 having the above configuration, there is a problem that the reflector 30 can easily flow.

In order to prevent the flow of the reflector 30 as described above, and to improve the assembling of the reflector 30 and the bottom cover 40, one surface of the double-sided tape 46 is disposed on the lower surface of each of one side and the other edge of the reflector 30. Then, the other surface of the double-sided tape 46 is attached on the side portion 44 of the bottom cover 40.

Attachment of the double-sided tape 46 as described above is made by hand. However, when the double-sided tape 46 is incorrectly attached, there is a problem that the reflective plate 30 and / or the bottom cover 40 may be damaged due to the adhesive force of the double-sided tape 46.

This may cause a decrease in productivity of the backlight unit 10 and the liquid crystal display including the same, and may act as a factor of increasing the unit cost of the backlight unit 10 and the liquid crystal display including the same.

Accordingly, an object of the present invention is to provide a backlight unit capable of preventing the flow of the reflector by changing the structures of the reflector and the bottom cover, and a liquid crystal display having the same.

In addition, another technical problem to be achieved by the present invention is to provide a backlight unit and a liquid crystal display having the same to improve the productivity by changing the structure of the reflector and the bottom cover by changing the structure of the reflector and the bottom cover. .

In addition, another technical problem to be achieved by the present invention is to provide a backlight unit and a liquid crystal display device having the same by lowering the unit cost by changing the structure of the reflector and the bottom cover to improve the assembly of the reflector and the bottom cover. will be.

Further technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above are clearly understood by those skilled in the art from the following description. It can be understood.

The backlight unit according to the present invention for achieving the above technical problem is a lamp for generating light; A reflector including a coupling hole and reflecting upwardly the light emitted downward from the light emitted from the lamp; And a coupling protrusion formed to protrude from the side portion at a position corresponding to a bottom portion, a side portion formed to extend from the bottom portion, and a coupling hole of the reflecting plate, and the lamp and the receiving space provided by the bottom portion and the side portion. And a bottom cover to accommodate the reflection plate and fix the reflection plate by inserting the coupling protrusion into the coupling hole of the reflection plate.

Here, the coupling hole of the reflecting plate, may be formed at each edge of one side and the other side of the reflecting plate.

On the other hand, the liquid crystal display according to the present invention for achieving the above technical problem is a lamp for generating light; A reflector including a coupling hole and reflecting upwardly the light emitted downward from the light emitted from the lamp; And a coupling protrusion formed to protrude from the side at a position corresponding to a bottom portion, a side portion formed to extend from the bottom portion, and a coupling hole of the reflecting plate, and the lamp and a storage space provided by the bottom portion and the side portion. A bottom cover accommodating the reflective plate and fixing the reflective plate by inserting the coupling protrusion into the coupling hole of the reflective plate; And a liquid crystal panel which displays an image using light emitted from the lamp.

Here, the coupling hole of the reflecting plate, may be formed at each edge of one side and the other side of the reflecting plate.

The details of other embodiments are included in the detailed description and drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.

Hereinafter, a backlight unit and a liquid crystal display having the same according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exploded perspective view illustrating a backlight unit according to an exemplary embodiment of the present invention. 3 is a cross-sectional view taken along line III-III ′ of FIG. 2.

2 and 3, the backlight unit 110 according to the embodiment of the present invention may provide light to the liquid crystal panel to be disposed above it.

To this end, the backlight unit 110 may include a lamp 120, a reflector 130, and a bottom cover 140. In addition, the backlight unit 110 may further include a diffusion plate 150, an optical sheet 160, and a panel guide 170.

The lamp 120 may be driven by receiving power from the outside and may generate light. The lamp 120 may be fixed by being inserted into lamp holders 122 respectively formed at both ends thereof. Specifically, the lamp 120 may include a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), an external electrode fluorescent lamp (EEFL), and light emission. The light emitting diode may be one of LEDs, but is not limited thereto.

The reflector 130 may reflect upwardly the light emitted downward from the light emitted from the lamp 120. In addition, the reflector plate 130 may be coupled to the coupling protrusion 148 formed to protrude from the side portion 144 of the bottom cover 140. Here, the reflector 130 may be formed of a foamed plastic, for example, a foamed polyethylene terephthalate (PET) material to reflect upwardly the light emitted downward from the light emitted from the lamp 120. May, but is not limited to.

The reflection plate 130 may include first and second reflection parts 132 and 134, a coupling part 136, and a coupling hole 138.

The first reflector 132 may reflect most of the light emitted downward from the light emitted from the lamp 120 upward.

To this end, the first reflector 132 may be formed below the lamp 120 adjacent to the lamp 120. For this reason, the first reflecting part 132 may be formed to contact the bottom part 142 of the bottom cover 140.

The second reflector 134 may improve the brightness of the backlight unit 110 by reflecting the light emitted from one side and the other side of the reflector 130 upward from the light emitted from the lamp 120.

To this end, the second reflector 134 may be formed to extend from the first reflector 132. In this case, the second reflector 134 may be formed to be bent upward from the first reflector 132. Thus, the second reflector 134 may be formed to be adjacent to the side portion 144 of the bottom cover 140.

The coupling part 136 may be formed to extend from the second reflecting part 134. In this case, the coupling part 136 may be formed to be bent downward from the second reflecting part 134. For this reason, the coupling part 136 may be formed to contact the inner side surface 146 of the side part 144 of the bottom cover 140.

Since the coupling part 136 is formed to be bent downward from the second reflecting part 134 as described above, the coupling part 136 may have a restoring force of a predetermined size. That is, the coupling part 136 may have a force pushing the inner surface 146 of the side portion 144 of the bottom cover 140 outward. For this reason, the coupling part 136 may be in close contact with the inner side surface 146 of the side part 144 of the bottom cover 140.

The coupling hole 138 may be formed at a position corresponding to the coupling protrusion 148 formed to protrude from the side portion 144 of the bottom cover 140. Here, the number of coupling holes 138 may vary depending on the size of the backlight unit 110 and the number of coupling protrusions 148, and is not limited thereto.

To this end, the coupling hole 138 may be formed at each edge of one side and the other side of the reflector plate 130. Specifically, the coupling hole 138 may be formed in the coupling portion 136. Here, the coupling hole 138 may be formed through the press working.

As described above, when the coupling hole 138 is formed in the coupling part 136, the coupling protrusion 148 of the bottom cover 140 may be easily inserted into the coupling hole 138. In addition, the coupling protrusion 148 inserted into the coupling hole 138 is not easily removed from the coupling hole 138 by the restoring force of the coupling portion 136.

For this reason, even when an impact is applied to the backlight unit 110 from the outside, the coupling structure of the coupling hole 138 and the coupling protrusion 148 may be maintained. For this reason, the flow of the reflecting plate 130 can be prevented.

In addition, the operator can easily insert the coupling protrusion 148 into the coupling hole 138. As a result, assembling of the backlight unit 110 may be improved, and thus productivity of the backlight unit 110 and the liquid crystal display including the same may be improved.

In addition, when the coupling protrusion 148 is incorrectly inserted into the coupling hole 138, the worker may not damage the reflector plate 130 and the bottom cover 140, and the coupling protrusion 148 may be incorrectly inserted into the coupling hole ( 138) there is an advantage that it can be easily taken out. In this case, the coupling protrusion 148 can be easily reinserted into the coupling hole 138 formed at a desired position. As a result, assembling of the backlight unit 110 may be improved, and thus the unit cost of the backlight unit 110 and the liquid crystal display including the same may be reduced.

The bottom cover 140 may accommodate the lamp 120 and the reflecting plate 130 and fix the reflecting plate 130.

For this purpose, the bottom cover 140 may include a bottom portion 142, a side portion 144, and a coupling protrusion 148.

The side portion 144 may be formed to extend from the bottom portion 142. In this case, an accommodation space may be provided due to the bottom part 142 and the side part 144, and the lamp 120 and the reflector plate 130 may be accommodated in the accommodation space. Here, the shape of the side part 144 is not limited.

The coupling protrusion 148 may be formed to protrude inward from the side portion 144, for example. The coupling protrusion 148 may be formed at a position corresponding to the coupling hole 138 of the reflector plate 130 and may be inserted into the coupling hole 138. Through this, the bottom cover 140 may fix the reflective plate 130. Here, the coupling protrusion 148 may be formed through a press working.

The diffuser plate 150 may be seated on the supporter side mold 152 and / or the side portion 144 of the bottom cover 140 and may exit upward through itself to prevent the shape of the lamp 120 from appearing. It can diffuse light.

The optical sheet 160 may be mounted on the diffusion plate 150, and may improve brightness and uniformity of light emitted through the diffusion plate 150.

To this end, the optical sheet 160 may be composed of at least one sheet of a diffusion sheet, a prism sheet, and a brightness enhancement sheet, but is not limited thereto.

The panel guide 170 may have a substantially rectangular frame shape to surround the side portion 144 of the bottom cover 140. The panel guide 170 may be fastened to the bottom cover 140 through a screw and / or a hook. For this reason, the flow of the diffusion plate 150 and / or the optical sheet 160 can be prevented. Here, the liquid crystal panel 180 may be seated on the panel guide 170.

4 is an exploded perspective view illustrating a liquid crystal display including the backlight unit illustrated in FIG. 2. FIG. 5 is a cross-sectional view taken along the line VV ′ of FIG. 4. Since the backlight unit illustrated in FIG. 4 is the same as the backlight unit illustrated in FIG. 2, the same reference numerals are used, and description thereof will not be repeated, and only the features thereof will be described.

4 and 5, the liquid crystal display 100 according to the exemplary embodiment of the present invention includes a backlight unit 110 and a liquid crystal panel 180.

The backlight unit 110 may be disposed under the liquid crystal panel 180 and may provide light to the liquid crystal panel 180.

To this end, the backlight unit 110 may include a lamp 120, a reflector 130, and a bottom cover 140. In addition, the backlight unit 110 may further include a diffusion plate 150, an optical sheet 160, and a panel guide 170. Here, the reflector 130 may include first and second reflectors 132 and 134, a coupling part 136, and a coupling hole 138. In addition, the bottom cover 140 may include a bottom portion 142, a side portion 144, and a coupling protrusion 148.

The liquid crystal panel 180 may be seated on the panel guide 170. In this case, the liquid crystal panel 180 may have a substantially rectangular frame shape and may be fixed on the panel guide 170 by a top cover formed to surround the edge of the liquid crystal panel 180. Here, the top cover may be fastened to the panel guide 170 through a screw and / or a hook.

The liquid crystal panel 180 may display an image using light provided from the backlight unit 110, that is, light emitted from the lamp 120.

To this end, the liquid crystal panel 180 may include a color filter substrate 182 and a thin film transistor substrate 184 facing each other with the liquid crystal interposed therebetween.

The color filter substrate 182 may make the image seen through the liquid crystal panel 180 have a color.

To this end, the color filter substrate 182 may include a color filter array formed of a thin film on a transparent substrate such as glass or plastic, for example, a red / green / blue color filter. Here, the first polarizer may be attached to the outer surface of the color filter substrate 182.

The thin film transistor substrate 184 may apply a driving voltage provided from the printed circuit board 190 to the liquid crystal through the driving film 192 in response to the driving signal provided from the printed circuit board 190.

To this end, the thin film transistor substrate 184 may include a thin film transistor, a pixel electrode, and a common electrode formed of a thin film on another substrate of a transparent material such as glass or plastic. Here, the common electrode may be formed on the color filter substrate 182. Here, the second polarizer may be attached to the outer surface of the thin film transistor substrate 184.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You can understand that there is.

Therefore, it should be understood that the above-described embodiments are provided so that those skilled in the art can fully understand the scope of the present invention. Therefore, it should be understood that the embodiments are to be considered in all respects as illustrative and not restrictive, The invention is only defined by the scope of the claims.

According to the present invention, the reflective plate and the bottom cover can be firmly combined. Through this, it is possible to prevent the flow of the reflector. The coupling of the reflector plate and the bottom cover can be easily achieved by inserting the coupling protrusion of the bottom cover into the coupling hole formed in the reflector plate. For this reason, the assembly property of a backlight unit can be improved and reworkability can be improved. As a result, productivity of the backlight unit and the liquid crystal display including the same can be improved, and the unit cost of the backlight unit and the liquid crystal display including the same can be reduced.

Claims (14)

A lamp that generates light; A reflector including a coupling hole and reflecting upwardly the light emitted downward from the light emitted from the lamp; And A coupling protrusion formed to protrude from the side at a position corresponding to a bottom portion, a side portion formed to extend from the bottom portion, and a coupling hole of the reflecting plate, and the lamp and the storage space provided by the bottom portion and the side portion. A bottom cover which accommodates the reflecting plate and fixes the reflecting plate by inserting the coupling protrusion into the coupling hole of the reflecting plate, The reflector includes: A first reflector formed to contact the bottom of the bottom cover; A second reflector formed to extend from the first reflector and bent upward from the first reflector to apply a first restoring force toward a side of the bottom cover; And And a coupling part formed to extend from the second reflecting part, the coupling part being bent downward from the second reflecting part and configured to apply a second restoring force to an inner side surface of the side part of the bottom cover. The method of claim 1, The coupling hole of the reflecting plate, the backlight unit, characterized in that formed on the edge of each of one side and the other side of the reflecting plate. delete The method of claim 1, The coupling unit of the reflecting plate is formed to be in contact with the inner surface of the side of the bottom cover. The method of claim 1, Back light unit, characterized in that the coupling hole of the reflecting plate is formed in the coupling portion of the reflecting plate. The method of claim 1, The coupling protrusion of the bottom cover is formed so as to protrude inward from the side of the bottom cover. The method of claim 1, Each of the coupling holes of the reflector and the coupling protrusion of the bottom cover is formed by pressing. delete delete delete delete delete delete delete

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