KR100937705B1 - Back light assembly and liquid crystal display device having same - Google Patents

Abstract

A backlight assembly and a liquid crystal display including the same for preventing the light guide plate from flowing are disclosed. A boss is formed in one of the storage container and the light guide plate and a flow preventing groove is formed in the other member to fix the light guide plate, or the light guide plate is fixed by inserting a fixing part having elastic force in the storage container and the light guide plate to prevent the flow of the light guide plate. prevent. As a result, the light guide plate does not collide with the lamp unit, thereby preventing damage to the lamp unit, improving image quality and reliability of the screen, and minimizing the edge width of the storage container, thereby reducing the size of the liquid crystal display device. The aesthetics of the display device can be greatly improved.

Backlight Assembly, Light Guide Plate, Storage Container, Fixed, Liquid Crystal Display

Description

BACK-LIGHT ASSEMBLY AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

1 is an exploded perspective view of a backlight assembly according to a first embodiment of the present invention.

2 is a cross-sectional view taken along the line A-A of FIG. 1.

3 is a cross-sectional view for describing a boss formed in a conical pillar shape and a flow preventing groove formed in a conical groove shape.

FIG. 4 is a rear view of the light guide plate shown in FIG. 1.

5 is an exploded perspective view of a backlight assembly according to a second embodiment of the present invention.

FIG. 6 is a rear perspective view of the light guide plate illustrated in FIG. 5.

7 is a cross-sectional view taken along line B-B of FIG. 5.

8 is a cross-sectional view for describing a boss formed in a conical column shape and a flow preventing groove formed in a conical groove shape according to a second embodiment of the present invention.

9 is an exploded perspective view of a backlight assembly according to a third embodiment of the present invention.

10 is a cross-sectional view taken along the line C-C of FIG. 9.                 

FIG. 11 is a rear view of the light guide plate shown in FIG. 9.

12 is an exploded perspective view showing an embodiment of a liquid crystal display according to a fourth embodiment of the present invention.

The present invention relates to a backlight assembly and a liquid crystal display device having the same, and more particularly, to a backlight assembly and a liquid crystal display device including the same by improving the display quality and reliability of the screen by preventing the light guide plate from being fixed by mutually fixing the light guide plate and the storage container. will be.

In general, liquid crystals (LCs) have both electrical characteristics whose arrangement changes in response to the intensity of an electric field, and optical characteristics which change light transmittance according to the arrangement. A liquid crystal display device displays an image by using electrical and optical characteristics of a liquid crystal.

The liquid crystal display device has an advantage of smaller volume and weight than other display devices. In addition, the liquid crystal display device has a display quality comparable to or superior to that of other display devices, so that the liquid crystal display device is widely used as a display device of most information processing devices.

Since the liquid crystal used in such a liquid crystal display device does not generate light by itself and adjusts only the light transmittance, light is required to perform the display by the liquid crystal display device. As a result, a normal liquid crystal display device is provided with a backlight assembly that provides light for display.

The backlight assembly includes a lamp unit for generating light, a light guide plate for guiding light, an optical sheet for diffusing and condensing the light transmitted from the light guide plate, and a storage container in which the storage space is formed and accommodated therein.

Since the backlight assembly configured as described above is an important component for determining display quality and appearance quality of the liquid crystal display device, it is important to fix the lamp assembly, the light guide plate, and the optical sheet to the storage container so as not to flow.

In particular, when the light guide plate flows due to an external shock or vibration, the optical characteristics of the liquid crystal display are changed, thereby degrading the image quality. Therefore, conventionally, the edges of the light guide plate are chamfered at right angles to prevent flow of the light guide plate without greatly increasing the size of the liquid crystal display. In addition, a portion of the storage space of the storage container corresponding to the edge of the light guide plate is inserted into the chamfered portion to prevent the flow of the light guide plate is formed.

However, when the light guide plate is fixed to the storage container by the above method, the light leakage phenomenon or the edge of the light guide plate where the light emitted from the lamp unit is scattered or diffused at the right angled chamfered portion is relatively brighter than other portions. Dark areas appear where parts appear relatively darker than others. For this reason, the light leakage phenomenon and the dark portion greatly reduce the image quality of the liquid crystal display.

Further, in order to prevent the light guide plate from flowing in the conventional backlight assembly, fixing protrusions extending toward the side of the storage container are formed on side surfaces of the light guide plate on which the lamp unit is not installed. In addition, the light guide plate and the storage container are unevenly coupled to form a fixing groove into which the fixing protrusion is fitted in a portion corresponding to the fixing protrusion of the side of the storage container.

However, when fixing the light guide plate in the fixing groove of the storage container in this way, the light leakage phenomenon occurs that the light is scattered or diffused in the fixing projections and the fixing projection portion is brighter than the other portion has a problem that the image quality is deteriorated. In addition, when a strong impact is applied, the fixing protrusion of the light guide plate may be easily broken, and when the fixing protrusion is broken, the light guide plate collides with the lamp unit and damages the lamp unit, thereby lowering the reliability of the product. In addition, when the fixing projection is formed on the light guide plate and the fixing groove is formed in the storage container to fix the light guide plate to the storage container, the edge width of the storage container must be increased, thereby increasing the volume and weight of the liquid crystal display device.

Accordingly, the present invention has been made in view of such a conventional problem, and a first object of the present invention is to provide a backlight assembly that improves reliability of a product by preventing the light guide plate from flowing.

A second object of the present invention is to provide a liquid crystal display device having the light guide plate.

In order to realize the first object of the present invention, the present invention provides a storage container having a storage space formed on one surface, an emission surface fixed to the storage container, and a reflection surface and light reflecting incident light to the emission surface. Four side surfaces including the incident surface of the incident light guide plate connecting the exit surface and the reflective surface, and a storage container with a storage space for storing the lamp unit and the light guide plate on the surface facing the reflective surface, According to an aspect of the present invention, there is provided a backlight assembly including a flow preventing unit that prevents the light guide plate from flowing, and a lamp unit that is accommodated in an accommodation space and installed to face the incident surface so that light is incident on the light guide plate through the incident surface.

In addition, the present invention in order to implement the second object of the present invention is a storage container having a storage space formed on one surface, the output surface is inserted into the storage space, the light emitting surface, the reflective surface and the light reflecting the incident light to the light emitting surface Four side surfaces including the incident surface are incident light guide plate connecting the exit surface and the reflective surface, a flow preventing member to secure the light guide plate to the storage container and the light guide plate to prevent the flow of the light guide plate and the light is received in the light guide plate through the incident surface A liquid crystal display including a backlight assembly including a lamp unit installed to face the incident surface so as to be incident, and a liquid crystal display unit installed on an upper portion of the backlight assembly to display an image by light and electric signals transmitted from the backlight assembly. to provide.

According to the present invention, a flow preventing groove or a boss is formed on the reflective surface of the light guide plate, and a boss or a flow preventing groove is formed on the bottom surface of the storage container facing the reflective surface to fix the light guide plate to the storage container, or the reflective surface of the light guide plate. It is formed in each of the bottom surface of the and the receiving container, and by inserting a fixing member having an elasticity in the insertion groove to fix the light guide plate to the storage container, it is possible to prevent damage to the lamp unit due to the flow of the light guide plate, the display quality of the screen Can improve.                     

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Embodiments of Backlight Assembly

Example 1

1 is an exploded perspective view of a backlight assembly according to a first embodiment of the present invention. 2 is a cross-sectional view taken along the line A-A of FIG. 1. 3 is a cross-sectional view for describing a boss formed in a conical column shape and a flow preventing groove formed in a conical groove shape according to a first embodiment of the present invention.

1 and 2, the backlight assembly 700 includes a storage container 100, a reflective sheet 200, a light guide plate 300, a lamp unit 400, and an optical sheet 500.

The storage container 100 accommodates and fixes the reflective sheet 200, the light guide plate 300, the lamp unit 400, and the optical sheet 500. The storage container 100 has a storage space 110 is formed, the boss 120 is formed in the storage container 100.

The storage container 100 has four side surfaces 114 connected to the bottom surface 112 and the bottom surface 112, and the storage space 110 is connected to the bottom surface 112 and the bottom surface 112. Two sides 114. The storage space 110 is formed in a shape corresponding to the light guide plate 300 and has a size enough to insert the light guide plate 300 and the lamp unit 400.

The boss 120 may fix the light guide plate 300 to the storage container 100 to prevent the light guide plate 300 from flowing. The boss 120 is formed at an edge of the bottom surface 112 and protrudes toward the light guide plate 300.                     

The position in which the boss 120 is formed will be described in more detail as follows. The boss 120 is composed of a first boss 122 and a second boss 124, and the first boss 122 and the second boss 124 are a pair of side surfaces 114 of the bottom surface 112 facing each other. ) And adjacent to each other. Referring to FIG. 1, the boss 120 is formed perpendicular to the bottom surface 112.

The boss 120 may be formed in a cylindrical shape as shown in FIG. 1, or may be formed in a conical column shape as shown in FIG. 3, or may be formed in various shapes such as a triangular pyramid column, a triangular pyramid, and a polygonal pyramid. Can be.

The reflective sheet 200 is installed between the bottom surface 112 of the storage space 110 and the light guide plate 300 to reflect the light leaked to the outside of the light guide plate 300 toward the light guide plate 300. 2 and 3, a through hole 212 into which the boss 120 is fitted is formed at a portion of the reflective sheet 200 that corresponds to the boss 120.

FIG. 4 is a rear view of the light guide plate shown in FIG. 1.

1 and 4, the light guide plate 300 is installed on the reflective sheet 200 and guides the light incident from the lamp unit 400 to the optical sheet 500 and distributes the line light source optical distribution to the surface light source optical. Change to distribution. The light guide plate 300 has four side surfaces 330 including an emission surface 310 to which light is emitted, a reflection surface 320 to reflect incident light to the emission surface 310, and an entrance surface 330a to which light is incident. The emission surface 310 and the reflection surface 320 is formed in a rectangular shape.

A flow preventing groove 340 into which the boss 120 is fitted is formed at a portion of the edge of the reflective surface 320 corresponding to each boss 120. The flow preventing groove 340 is composed of a first flow preventing groove 342 and a second flow preventing groove 344.

The first flow preventing groove 342 is fitted into and coupled to the first boss 122 formed on the bottom surface 112 of the storage container 100. In order to prevent the light guide plate 300 from flowing, the area of the first flow preventing groove 342 has an area enough to insert the first boss 124.

The second flow preventing groove 344 is fitted into the second boss 124 formed on the bottom surface 112 of the storage container 100. The second flow preventing groove 344 is formed in a long hole shape to accommodate the length of the light guide plate 300 due to thermal expansion.

2 and 3, the shape of the boss 120 is determined to correspond to the shape of the first flow preventing groove 342 and the second flow preventing groove 344. For example, when the flow preventing groove 340 has a quadrangular pyramid groove shape as shown in FIG. 3, since the light hitting the side surface of the flow preventing groove 340 is uniformly diffused, the portion of the flow preventing groove 340 is different from the other portion. The darker phenomenon can be prevented. In addition, when the flow preventing groove 340 is formed in a conical groove shape, and the boss 120 is formed in a conical column shape, it is very easy to assemble the light guide plate 300 to the storage container 100. Preferably, the depth of the first flow preventing groove 342 and the second flow preventing groove 344 is as low as possible to prevent light leakage caused by light scattering.

The lamp unit 400 is installed to face the incident surface 330a of the light guide plate 300. The lamp unit 400 includes a lamp 410, a lamp reflector 420, and a lamp holder 430.

The lamp 410 emits light by an applied discharge voltage, and is installed to face the incident surface 330a of the light guide plate 300. The lamp reflector 420 reflects the light emitted from the lamp 410 toward the incident surface 330a of the light guide plate 300. The lamp reflector 420 has a predetermined curvature, and a surface facing the incident surface 330a of the light guide plate 300 and a surface facing both ends of the lamp 410 are opened to surround the lamp 410. The lamp holder 430 is inserted into both end portions of the lamp 410 to fix the lamp 410 to the lamp reflector 420.

The optical sheet 500 is installed on the exit surface 310 of the light guide plate 300. The optical sheet is composed of a diffusion sheet 510 and a prism sheet 520.

The diffusion sheet 510 is stacked on the emission surface 310 of the light guide plate 300, and uniformly diffuses the light emitted through the emission surface 310. The prism sheet 520 is stacked on the diffusion sheet 510 and condenses the light transmitted from the diffusion sheet 510 to increase the luminance.

1 through 3, the through holes 212 and 214 may include the first of the edges of the reflective sheet 200 so that the boss 120 may be inserted into the first flow preventing groove 342 through the reflective sheet 200. It is formed in a portion corresponding to the flow preventing groove 342.

As in the present embodiment, the boss is formed on the bottom surface of the storage container and the flow prevention groove into which the boss is inserted is formed on the reflective surface of the light guide plate to fix the light guide plate to the storage container, thereby easily assembling the storage container and the light guide plate. In addition, the light guide plate may be prevented from flowing, the image quality may be improved, and the width of the edge portion of the storage container may be minimized, thereby reducing the size of the liquid crystal display device.

Example 2

5 is an exploded perspective view of a backlight assembly according to a second embodiment of the present invention. FIG. 6 is a rear perspective view of the light guide plate illustrated in FIG. 5. 7 is a cross-sectional view taken along line B-B of FIG. 5. 8 is a cross-sectional view for describing a boss formed in a conical column shape and a flow preventing groove formed in a conical groove shape according to a second embodiment of the present invention. In the backlight assembly according to the present embodiment, the boss is formed in the light guide plate, and the flow preventing groove in which the boss is inserted into the storage container is formed in the same manner as in the first embodiment. Therefore, the same members are denoted by the same reference numerals as those in the first embodiment, and duplicated descriptions thereof will be omitted.

For convenience of description, in the present embodiment, the light guide plate 300 will be described, and then the storage container 100 will be described.

5 to 6, the light guide plate 300 is installed on the reflective sheet 200 and guides the light incident from the lamp unit 400 toward the optical sheet 500. The light guide plate 300 has four side surfaces 330 including an emission surface 310 to which light is emitted, a reflection surface 320 to reflect incident light to the emission surface 310, and an entrance surface 330a to which light is incident. The emission surface 310 and the reflection surface 320 is formed in a rectangular shape.

At least one boss 350 is formed at each of the two edges positioned in the first direction of the edges of the reflective surface 320 connected to the four side surfaces 330. The boss 350 protrudes from the reflective surface 320 toward the storage container 100 to fix the light guide plate 300 to the storage container 100. Referring to FIG. 6, the boss 350 connected to the reflective surface 320 has a cylindrical shape.                     

8 is a cross-sectional view for describing a boss having a conical pillar shape and a flow preventing groove having a conical groove shape.

Referring to FIG. 8, the boss 350 formed on the light guide plate 300 has a conical shape, and the boss 350 includes a first boss 352 and a second boss 354.

5 and 8, the storage container 100 accommodates and fixes the reflective sheet 200, the light guide plate 300, the lamp unit 400, and the optical sheet 500. The storage container 100 is provided with a storage space 110 and the flow preventing groove 130.

The storage space 110 is formed on one surface facing the reflective sheet 200 and has four bottoms 114 connected to the bottom surface 112 and the bottom surface 112. The storage space 110 is formed in a shape corresponding to the light guide plate 300 and has a size enough to insert the light guide plate 300 and the lamp unit 400.

A portion of the edge of the bottom surface 1120 corresponding to the boss 350 is formed with a flow preventing groove 130 into which the boss 350 is fitted. The flow preventing groove 130 is composed of a first flow preventing groove 132 and a second flow preventing groove 134.

The first flow preventing groove 132 is formed at a position corresponding to the first boss 352 of the bottom surface 112. The first flow preventing groove 132 is unevenly coupled with the first boss 352. In this case, an area of the first flow preventing groove 132 may have an area that fits tightly with the first boss 352 to prevent the light guide plate 300 from flowing.

The second flow preventing groove 134 is formed at a position corresponding to the second boss 354 of the bottom surface 112. The second flow preventing groove 134 is unevenly coupled with the second boss 354. At this time, the second flow preventing groove 134 has a long hole shape in consideration of the length of the light guide plate 300 is expanded by heat.

7 and 8, the shape of the first flow preventing groove 132 and the second flow preventing groove 134 is formed to be the same as the shape of the boss 350. For example, when the boss 350 has a conical pillar shape as shown in FIG. 8, the flow preventing groove 130 also has a conical groove shape.

As in the present embodiment, when the flow preventing groove is formed on the bottom surface of the storage container, and the boss is formed on the reflective surface of the light guide plate to fix the light guide plate to the storage container, assembling of the storage container and the light guide plate is very easy, It can prevent, improve image quality, and minimize the width of the edge portion of the storage container, thereby reducing the size of the liquid crystal display device.

Example 3

9 is an exploded perspective view of a backlight assembly according to a third embodiment of the present invention. 10 is a cross-sectional view taken along the line C-C of FIG. 9. The backlight assembly according to the present embodiment is the same as the first embodiment except for the elastic boss, the light guide plate and the flow preventing groove formed in the housing. Therefore, the same members are denoted by the same reference numerals as those in the first embodiment, and duplicated descriptions thereof will be omitted.

9 and 10, the storage container 100 accommodates and fixes the reflective sheet 200, the light guide plate 300, the lamp unit 400, and the optical sheet 500. The storage container 100 is provided with a storage space 110 and the first flow preventing groove 140. At this time, the first flow preventing groove 140 is at least two.

The storage space 110 is formed on one surface facing the reflective sheet 200 and has four bottoms 114 connected to the bottom surface 112 and the bottom surface 112. The storage space 110 is formed in a shape corresponding to the light guide plate 300 and has a size enough to insert the light guide plate 300 and the lamp unit 400.

FIG. 11 is a rear view of the light guide plate shown in FIG. 9.

10 and 11, the light guide plate 300 is installed on the reflective sheet 200 and guides the light incident from the lamp unit 400 toward the optical sheet 500. The light guide plate 300 has four side surfaces 330 including an emission surface 310 to which light is emitted, a reflection surface 320 to reflect incident light to the emission surface 310, and an entrance surface 330a to which light is incident. The emission surface 310 and the reflection surface 320 is formed in a rectangular shape.

A second flow preventing groove 360 is formed at a portion of the edge of the reflective surface 320 corresponding to each of the first flow preventing grooves 140. The shape and size of the second flow preventing groove 360 is the same as the shape and size of the first flow preventing groove 140.

The fixing part 600 is fitted into the first flow preventing groove 140 and the second flow preventing groove 360 to fix the light guide plate 300 to the storage container 100. The fixing part 600 is formed in a shape corresponding to the shape of the first flow preventing groove 140 and the second flow preventing groove 360. The length of the fixing part 600 is equal to the sum of the depth of the first flow preventing groove 140, the length of the through hole 216 formed in the reflective sheet 200, and the depth of the second flow preventing groove 360. same.

In addition, the fixing part 600 is elastic in order to accommodate the length of the light guide plate 300 which is extended by thermal expansion and to prevent damage of the light guide plate 300, and the part where the fixing part 600 is fitted looks darker than other parts. In order to prevent the appearance of light, the light refractive index of the light guide plate 300 has the same light refractive index and is formed of a transparent material.

When the storage container and the light guide plate are fixed using the fixing part having elasticity as in the present embodiment, the light guide plate can be prevented from flowing and the image quality can be improved. In addition, it is possible to minimize the width of the edge portion of the storage container can reduce the size of the liquid crystal display device.

Embodiments of Liquid Crystal Display

Example 4

12 is an exploded perspective view showing an embodiment of a liquid crystal display according to a fourth embodiment of the present invention.

Referring to FIG. 12, the liquid crystal display 1000 may be covered by a display unit 800 displaying an image, a backlight assembly 700 for providing light to the display unit 800, and an upper portion of the display unit 800. It includes a top chassis 900 coupled with the storage container 100. A portion of the top chassis 900 corresponding to the display area of the display unit 800 is opened to expose the display area to the outside.

The display unit 800 includes a TFT substrate 810 for constructing a screen, a liquid crystal display panel 840 composed of a liquid crystal and a color filter substrate 820, and a printed circuit board 830 for driving the liquid crystal display panel 810. Is done.

The backlight assembly 700 includes a storage container 100, a reflective sheet 200, a light guide plate 300, a lamp unit 400, and an optical sheet 500. In the present embodiment, since the backlight assembly 700 is the same as the first to third embodiments described above, a duplicate description thereof will be omitted.

According to the present exemplary embodiment, a boss is formed in the storage container 100 to couple the light guide plate 300 and the storage container 100 to each other, and a flow preventing groove is formed at a portion of the light guide plate 300 corresponding to the boss. Alternatively, in order to couple the light guide plate 300 and the storage container 100 to each other, it is also preferable to form a flow preventing groove in the storage container 100 and to form a boss coupled with the flow preventing groove in the light guide plate 300. In addition, alternatively, both the light guide plate 300 and the storage container 100 form a flow preventing groove, and both the elastic and transparent bosses in the flow preventing groove of the light guide plate 300 and the flow preventing groove of the storage container 100. The light guide plate 300 and the storage container 100 are fixed to each other.

As described above in detail, a boss is formed in one member of the storage container and the light guide plate and a flow preventing groove is formed in the other member to fix the light guide plate, or a fixing part having elastic force in the storage container and the light guide plate. By fixing the light guide plate to prevent the flow of the light guide plate, damage to the lamp unit can be prevented and the image quality and reliability of the screen can be improved. In addition, since the edge width of the storage container can be minimized, the size of the liquid crystal display device can be reduced, thereby improving the appearance quality of the product.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (18)

A lamp unit for generating light; The light guide plate which connects the light emitting surface and the reflecting surface has four side surfaces including an emission surface on which the light is emitted, a reflection surface for reflecting the incident light to the emission surface, and an entrance surface on which the lamp unit is installed and the light is incident. ; A storage container having a storage space for accommodating the lamp unit and the light guide plate on a surface facing the reflective surface; And It includes a flow preventing unit for fixing the storage container and the light guide plate to prevent the flow of the light guide plate, The flow preventing part includes a first flow preventing groove formed at an edge of the reflective surface, a second flow preventing groove formed at a portion of the bottom surface of the storage space corresponding to the first flow preventing groove, and one side end facing the light guide plate. And a fixing portion inserted into the first flow preventing groove from the other side to a predetermined portion, and fixed to hold the light guide plate and the storage container by being inserted into the second flow preventing groove from the other end facing the storage space. Backlight assembly, characterized in that. delete delete delete delete delete delete delete delete delete The backlight assembly of claim 1, wherein the fixing part is formed of a transparent and elastic material. The backlight assembly of claim 11, wherein the fixing part has the same refractive index as that of the light guide plate. A storage container in which a storage space is formed on one surface; Four side surfaces which are inserted into the storage space and include an emission surface for emitting light, a reflection surface for reflecting the incident light to the emission surface, and an entrance surface for entering the light, connect the emission surface and the reflection surface. Light guide plate; A flow preventing unit fixing the storage container and the light guide plate to prevent flow of the light guide plate; A backlight assembly accommodated in the accommodation space and including a lamp unit facing the incident surface such that light is incident on the light guide plate through the incident surface; And A liquid crystal display unit installed on the backlight assembly to display an image by light and electric signals transmitted from the backlight assembly,  The flow preventing part includes a first flow preventing groove formed at an edge of the reflective surface, a second flow preventing groove formed at a portion of the bottom surface of the storage space corresponding to the first flow preventing groove, and one side end facing the light guide plate. And a fixing portion inserted into the first flow preventing groove from the other side to a predetermined portion, and fixed to hold the light guide plate and the storage container by being inserted into the second flow preventing groove from the other end facing the storage space. Liquid crystal display device characterized in that. delete delete delete delete The liquid crystal display of claim 13, wherein the fixing unit has elasticity.

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