KR20110134029A - Backlight unit and display device including the same - Google Patents

Abstract

PURPOSE: A backlight unit and a display device including the same are provided to reinforce a coupling structure of a backlight unit by inserting a protrusion unit of a bracket to a groove of a bottom cover. CONSTITUTION: A light emitting device module(80) includes a bracket(12). The light emitting device module is fixed to a bottom chassis. The bottom chassis receives a light guide plate(30). Protrusion units(12b) are formed in two or more parts of the bracket. The protrusion unit is inserted into a groove formed on a bottom cover(10).

Description

Backlight unit and display device including same. {Backlight unit and display device including the same}

Embodiments relate to a backlight having a light emitting device and a display device including the same.

Light emitting devices such as light emitting diodes or laser diodes using semiconductors of Group 3-5 or 2-6 compound semiconductor materials of semiconductors have various colors such as red, green, blue and ultraviolet rays due to the development of thin film growth technology and device materials. It is possible to realize efficient white light by using fluorescent materials or combining colors, and it has low power consumption, semi-permanent life, fast response speed, safety and environmental friendliness compared to conventional light sources such as fluorescent and incandescent lamps. Has an advantage.

Therefore, a white light emitting device that can replace a fluorescent light bulb or an incandescent bulb that replaces a Cold Cathode Fluorescence Lamp (CCFL) constituting a backlight of a transmission module of an optical communication means and a liquid crystal display (LCD) display device. Applications are expanding to diode lighting devices, automotive headlights and traffic lights.

An embodiment is to reinforce a fastening structure of a backlight having a light emitting device.

Embodiments include a light emitting device module including a bracket having a light emitting device module; The light emitting device module is fixed, and includes a batam chassis for receiving the light guide plate, the bracket provides a backlight unit, characterized in that the projection is formed in at least two places and the projection is inserted into the groove formed in the bottom cover. .

Another embodiment includes a light emitting device module including a bracket having a light emitting device module, a light guide plate provided on one side of the light emitting device module and scattering light projected from the light emitting device module, and a first surface of the light guide plate. A diffuser plate provided to diffuse light emitted from the light guide plate, a reflective plate provided on a second surface of the light guide plate to totally reflect light lost from the light guide plate into the light guide plate, the light emitting device module, the light guide plate, a diffuser plate, and a reflecting plate And a bottom cover to be fixed, wherein the bracket includes: a backlight unit having a protrusion formed at at least two places and the protrusion inserted into a groove formed in the bottom cover; A panel realizing an image by the light projected by the optical system; And a color filter provided on the front surface of the panel and selectively transmitting any one of red, green, and blue light.

Here, the bracket is 'L' type, the horizontal portion of the bracket may protrude.

The bracket may have an 'L' shape, and a vertical portion of the bracket may protrude.

And, the width of the protrusion may be 5 ~ 10 millimeters.

In addition, the length of the protrusion may be 2 to 3 millimeters.

Another embodiment is a light emitting device module including a bracket having a light emitting device module; The light emitting device module is fixed and includes a batam chassis for receiving a light guide plate, wherein the batam chassis provides a backlight unit surrounding the bracket at at least two places.

Another embodiment includes a light emitting device module including a bracket having a light emitting device module, a light guide plate provided on one side of the light emitting device module and scattering light projected from the light emitting device module, and a first surface of the light guide plate. A diffuser plate provided at the light guide plate to diffuse light emitted from the light guide plate, a reflector plate provided at a second surface of the light guide plate to totally reflect the light lost from the light guide plate into the light guide plate, the light emitting device module, the light guide plate, and the diffuser plate; A bottom cover to which the reflector is fixed, wherein the batam chassis includes a backlight unit surrounding the bracket at at least two places; A panel realizing an image by the light projected by the optical system; And a color filter provided on the front surface of the panel and selectively transmitting any one of red, green, and blue light.

Here, the bracket is an 'L' type, the batam chassis may wrap the vertical portion of the bracket.

In addition, the bracket may be flat.

In the embodiment, the fastening structure of the backlight and the display device provided with the light emitting device is improved.

1 is an exploded perspective view of an embodiment of a display device;
FIG. 2 is a front perspective view of the bottom cover of FIG. 1;
3 is a cross-sectional view of an embodiment of a light emitting device package in a light emitting device module,
Figure 4 is a view showing a first embodiment of a fastening structure of the bottom cover and the bracket,
5 is a view showing a second embodiment of the fastening structure of the bottom cover and the bracket,
6 is a view showing a third embodiment of the fastening structure of the bottom cover and the bracket.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described.

In the description of the above embodiments, each layer (region), region, pattern or structures may be "on" or "under" the substrate, each layer (layer), region, pad or pattern. In the case of what is described as being formed, "on" and "under" include both being formed "directly" or "indirectly" through another layer. In addition, the criteria for the top or bottom of each layer will be described with reference to the drawings.

In the drawings, the thickness or size of each layer is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. In addition, the size of each component does not necessarily reflect the actual size.

1 is an exploded perspective view of an embodiment of a display device.

As shown, an embodiment of a display device includes a bottom cover 10, a light emitting device package module (not shown) provided at one side of the bottom cover, and a front surface of the bottom cover 10. A reflector 20 disposed in the light guide plate, a light guide plate 30 disposed in front of the reflector plate 20, and guiding light emitted from the light emitting module to the front of the display device, and an optical disposed in front of the light guide plate 30. The member 40, the liquid crystal display panel 60 disposed in front of the optical member 40, a top cover 70 provided in front of the liquid crystal display panel 60, and the bottom cover. Is disposed between the 10 and the top cover 70 may include a fixing member 50 for fixing the bottom cover 10 and the top cover 70 together.

The light guide plate 30 guides the light emitted from the light emitting module (not shown) to be emitted in the form of a surface light source, and the reflector 20 disposed behind the light guide plate 30 is the light emitting device package module. The light emitted from (not shown) is reflected in the light guide plate 30 to improve light efficiency.

However, the reflecting plate 20 may be provided as a separate component as shown in the figure, is provided in the form of a high reflectivity material is coated on the back of the light guide plate 30, or the front of the bottom cover 10. It is also possible.

Here, the reflective plate 20 may use a material having a high reflectance and that can be used in an ultra-thin shape, and may use polyethylene terephthalate (PET).

The light guide plate 30 scatters the light emitted from the light emitting device package module so that the light is uniformly distributed over the entire area of the screen of the liquid crystal display. Therefore, the light guide plate 30 is made of a material having a good refractive index and a high transmittance, and may be formed of polymethyl methacrylate (PMMA), polycarbonate (PC), polyethylene (PE), or the like.

The optical member 40 is provided on the light guide plate 30 to diffuse the light emitted from the light guide plate 30 at a predetermined angle. The optical member 40 allows the light guided by the light guide plate 30 to be uniformly irradiated in the direction of the liquid crystal display panel 60.

As the optical member 40, an optical sheet such as a diffusion sheet, a prism sheet or a protective sheet may be selectively laminated, or a micro lens array may be used. In this case, a plurality of optical sheets may be used, and the optical sheets may be made of a transparent resin such as acrylic resin, polyurethane resin, or silicone resin. The fluorescent sheet may be included in the above-described prism sheet as described above.

A liquid crystal display panel 60 may be provided on the front surface of the optical member 40. Here, it is obvious that other types of display devices requiring a light source besides the liquid crystal display panel 60 may be provided.

In the liquid crystal display panel 60, the liquid crystal is located between the glass substrates, and the polarizing plates are placed on both glass substrates in order to use the polarization of light. Here, the liquid crystal has an intermediate property between a liquid and a solid, and liquid crystals, which are organic molecules having fluidity like a liquid, are regularly arranged like crystals. The liquid crystal has a structure in which the molecular arrangement is changed by an external electric field And displays an image.

The liquid crystal display panel used in the display apparatus uses a transistor as a switch for regulating a voltage supplied to each pixel as an active matrix method.

Since the structure of a specific liquid crystal display panel is the same as that of the prior art, it abbreviate | omits.

In addition, a color filter (not shown) is provided on the front surface of the liquid crystal display panel 60 to transmit the light projected from the liquid crystal display panel 60 to transmit only the red, green, and blue light for each pixel. I can express it.

FIG. 2 is a front perspective view of the bottom cover of FIG. 1. FIG.

The bottom cover 10 may be formed in the form of a metal plate, and in order to reinforce its strength, the first forming part 10a and the first forming part 10a which extend in the lateral direction and are formed to be convex forward. It may include a second forming portion 10b is formed convexly perpendicular to the arrangement direction of 10a).

The first forming unit 10a and the second forming unit 10b may be formed by pressing the bottom cover 10. In addition, the front surface of the first forming unit 10a and the second forming unit 10b may have a constant flat surface, and the flat surfaces may be provided to have the same height.

This is for the reflector 20 to be disposed in the first forming portion 10a and the second forming portion 10b. The second forming unit 10b may be provided in plural to reinforce strength and spaced apart from each other.

In addition, a heat dissipation member 11 provided in the form of a heat pipe or a heat sink is installed between the second forming portions 10b, and the heat dissipation member 11 may also be provided in plural and spaced apart from each other.

The heat dissipation member 11 is provided to receive heat generated during the light emission operation of the light emitting device package module disposed on the bottom cover 10 to radiate heat to the outside. It may be disposed up and down within 10 by a predetermined length.

In addition, since the second forming part 10b is formed to protrude forward by a predetermined length, an inclined surface may be formed at a portion adjacent to the heat radiating member 11 to facilitate the installation thereof.

An edge wall 10c formed by bending forward is formed at the edge of the bottom cover 10 so that the light guide plate, the optical sheet, or the reflective sheet mounted inside the bottom cover 10 may not be separated to the outside. have.

In addition, grooves (not shown) formed at edges of the light guide plate 30, the reflector plate 20, and the optical member 40 are formed at a portion of the front portion of the bottom cover 10 adjacent to the left and right edge walls 10c. The support part for supporting the light guide plate, the reflecting plate, and the optical member may be provided.

Coupling holes 10f and 10g may be provided at the lower side of the bottom cover 10 to allow the fixing member 50 and the top cover 70 to be coupled through a coupling member such as a screw. In addition, the left and right edge walls 10c of the bottom cover 10 are provided with a coupling protrusion 10e through which the top cover 70 may be caught.

On the other hand, in order to compensate for the rigidity of the bottom cover 10, the bottom surface of the bottom cover 10 may be installed an H beam. The bottom cover 10 is provided with an installation member 13 for fixing the heat radiating member 11 to the bottom cover 10.

The installation member 13 includes a body portion 13a disposed in a left and right direction, an extension portion 13b extending toward the heat dissipation member 11 in a vertical direction from the body portion 13a, and the extension portion ( 13b) and a fastening hole 13c to which a fastening member to which the heat dissipation member 11 and the bottom cover 10 can be fastened is coupled.

Therefore, after the heat dissipation member 11 is placed on the bottom cover 10, the extension part 13b of the installation member 13 is placed on the front side of the heat dissipation member 11, and then the fastening member is attached to the fastening member. When inserted into the fastening hole 13c provided in the extension part 13b and fastened, the heat dissipation member 11 is closely contacted between the bottom cover 10 and the extension part 13b by the fastening force of the fastening member. And can be fixed in a placed state.

3 is a cross-sectional view of an embodiment of a light emitting device package in a light emitting device module.

4 is a cross-sectional view of an embodiment of a light emitting device package. Hereinafter, an embodiment of the light emitting device package will be described with reference to FIG. 4.

As illustrated, the light emitting device package according to the embodiment includes a package body 120, a first electrode layer 111 and a second electrode layer 112 provided on the package body 120, and the package body 120. And a light emitting device 100 according to an exemplary embodiment installed and electrically connected to the first electrode layer 111 and the second electrode layer 112, and a filler 140 surrounding the light emitting device 100.

The package body 120 may include a silicon material, a synthetic resin material, or a metal material. An inclined surface may be formed around the light emitting device 100 to increase light extraction efficiency.

The first electrode layer 111 and the second electrode layer 112 are electrically separated from each other, and provide power to the light emitting device 100. In addition, the first electrode layer 111 and the second electrode layer 112 may increase the light efficiency by reflecting the light generated from the light emitting device 100, the outside of the heat generated from the light emitting device 100 May also act as a drain.

The light emitting device 100 may be installed on the package body 120 or on the first electrode layer 111 or the second electrode layer 112.

The light emitting device 100 may be electrically connected to the first electrode layer 111 and the second electrode layer 112 by any one of a wire method, a flip chip method, or a die bonding method.

The filler 140 may surround and protect the light emitting device 100. In addition, the filler 140 may include a phosphor to change the wavelength of light emitted from the light emitting device 100.

The light emitting device package may mount at least one of the light emitting devices of the above-described embodiments as one or more, but is not limited thereto.

The light emitting device module 80 is provided on a printed circuit board 81, a plurality of light emitting device packages 82 arranged to be spaced apart from each other on the printed circuit board 81, and the printed circuit board 81. It may include a connector (not shown) for connecting the printed circuit board 81 to an external power supply.

Here, the printed circuit board to which the light emitting device package is fixed is fixed to the bracket, and the bracket is fixed to the bottom cover again, in order to prevent the increase in strength or weight or cost according to the strength of the fastening and the conventional screw fastening as follows: Indicates.

Figure 4 is a view showing a first embodiment of the fastening structure of the bottom cover and the bracket.

As shown, the reflector 20 is placed on the bottom cover 10, and the light guide plate 30 is disposed on the reflector 20. Thus, the reflector 20 may be in direct contact with the heat dissipation member (not shown).

The printed circuit board 81 to which each light emitting device package 82 is fixed may be bonded to the bracket 12. Here, the bracket 12 is made of a material having high thermal conductivity for heat dissipation in addition to the fixing of the light emitting device package 82, although not shown, a thermal pad is provided between the bracket 12 and the light emitting device package 82 It can be provided to facilitate heat transfer.

And, the bracket 12 is provided in the 'b' type as shown, the horizontal portion 12a is supported by the bottom cover 10, the vertical portion 12b is the printed circuit board 81 Can be fixed

As shown, the bottom cover 10 has a structure that surrounds the bracket 12, and as shown in perspective (a) and cross-sectional view (b), the bottom in interview with the vertical portion (b) of the bracket 12 A portion of the cover 10 may be bent to cover the vertical portion 12b of the bracket 12. At this time, the fastening portion described above for the stable fixing of the bracket 12 may be provided at at least two places of the bottom cover 10.

That is, the bottom cover 10 is bent to the outside in a shape similar to the letter 'c' for improving the heat dissipation effect at the portion interviewed with the vertical portion 12b of the bracket 12, in which at least two outside It is bent inward (bracket direction) rather than the side to surround the vertical portion 12b of the bracket 12.

In the above-described structure, the bottom cover 10 interviews the horizontal portion 12a of the bracket 10 and surrounds the vertical portion 12b, so that the bracket 12 can be stably fixed, and there is no separate fastening member so that the weight However, a reduction in manufacturing costs can also be expected. In addition, since the bottom cover 10 does not completely surround the bracket 12, the effect of dissipation of heat transferred from the light emitting device package and the printed circuit board may also be expected.

5 is a view showing a second embodiment of the fastening structure of the bottom cover and the bracket.

This embodiment is basically the same as FIG. 4, but shows a difference in the fastening structure of the bracket 12 and the bottom cover 10. That is, in this embodiment, the protrusion 12b is formed in the bracket 12, and the protrusion 12b is inserted into the groove of the bottom cover 10.

That is, as shown in the perspective view (a) and the cross-sectional view (b), a protrusion 12b extending from the horizontal portion 12a of the bracket 12 is formed, and the protrusion 12b prevents the stable fixing of the bracket 12. In order to be provided in at least two places. In addition, the bottom cover 10 may be provided with a groove (indicated by a dotted line in cross section) into which the protrusion 12b may be inserted.

In the perspective view, the projection 12b covered by the light guide plate 30 and the printed circuit board 81 is indicated by a dotted line. In the fastening structure according to the present embodiment, the flat bracket 12 is stably fastened to the bottom cover 10 through the protrusion 12b, and the vertical part may be omitted, thereby reducing the material to reduce the weight.

Here, the width of the protrusion 12b may be 5 ~ 10 millimeters. If the width is smaller than 5 millimeters, the strength may be weak, and the protrusion 12b may be damaged by external force. If the width is larger than 10 millimeters, the protrusion 12b may be difficult to form by pressing or the like.

In addition, the length of the protrusion 12b may be 2 to 3 millimeters. That is, the protrusion 12b should protrude from 2 to 3 millimeters from the bracket 12, but if it protrudes too little, it may be difficult to secure the bottom cover 10, and if it protrudes too much, the outside of the bottom cover 10 may protrude. It may pop out a lot and may not look good or may be an obstacle in transportation / use.

6 is a view showing a third embodiment of the fastening structure of the bottom cover and the bracket.

This embodiment is basically the same as FIG. 5, but shows a difference in the fastening structure of the bracket 12 and the bottom cover 10. That is, in the present embodiment, the bracket 12 is not flat but includes a horizontal portion 12a and a vertical portion 12b, and a protrusion 12b is formed in the vertical portion 12b, so that the protrusion 12b is formed. Is inserted into the groove of the bottom cover 10.

That is, the protrusion 12b may be inserted into the top of the bottom cover 10, and a groove formed in the bottom cover 1 may also be provided on the top of the bottom cover 10. This structure is slightly increased in the weight ratio of the structural support bracket 12 shown in Figure 5, the bracket having a cross-section of 'b' can stably accommodate the printed circuit board 82, can be fixed to the bottom cover 10 have.

In other words, Figure 5 is a projection of the horizontal portion of the bracket of the flat type, in the present embodiment, the vertical portion of the 'b' shaped bracket protrudes. However, although the formed position is different, the width and length of the protrusion may be the same as the above-described embodiment. That is, if the width of the protrusion is smaller than 5 millimeters, the strength may be weak, and the protrusion may be damaged by an external force. If the width is larger than 10 millimeter, it may be difficult to form the protrusion by pressing or the like.

In addition, the length of the protrusion may be 2 to 3 millimeters. In other words, the protrusion should protrude 2-3 mm from the bracket, but if it protrudes too little, it may be difficult to secure the bottom cover 10, and if it protrudes too much, it protrudes out of the bottom cover 10 so that it may not look good. It may be an obstacle in transportation / use.

Although not shown, a groove is formed in the bracket and a protrusion is formed in the bottom cover, such that the bracket and the bottom cover may be fastened.

Features, structures, effects, and the like described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

In addition, the above description has been made with reference to the embodiment, which is merely an example, and is not intended to limit the present invention. Those skilled in the art to which the present invention pertains will be illustrated as above without departing from the essential characteristics of the present embodiment. It will be appreciated that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

10: bottom cover 10a: first forming part
10b: second forming part 10c: edge wall
10e: engaging projection 10f, 10g: engaging hole
11: heat radiating member 12: bracket
12a: Horizontal part 12b: Vertical part, protrusion part
20: reflector 30: light guide plate
40: optical member 50: fixed member
60: liquid crystal display panel 70: top cover
80 light emitting device module 81 printed circuit board
82: light emitting device package

Claims (10)

A light emitting device module including a bracket having a light emitting device module;
The light emitting device module is fixed, and includes a batam chassis for receiving the light guide plate,
The bracket is a backlight unit, characterized in that the projection is formed in at least two places and the projection is inserted into the groove formed in the bottom cover. The method of claim 1,
The bracket is 'L' type, the backlight unit protruding the horizontal portion of the bracket. The method of claim 1,
The bracket is 'L' type, the backlight unit protruding the vertical portion of the bracket. The method of claim 1,
The bracket is a flat backlight unit. The method of claim 1,
The protrusion unit has a width of 5 to 10 millimeters. The method of claim 1,
The protrusion unit has a length of 2 to 3 millimeters. A light emitting device module including a bracket having a light emitting device module;
The light emitting device module is fixed, and includes a batam chassis for receiving the light guide plate,
Here, the batam chassis surrounds the bracket at at least two places. The method of claim 7, wherein
The bracket has an 'L' type, and the batam chassis surrounds the vertical portion of the bracket. A light emitting device module including a bracket provided with a light emitting device module, a light guide plate provided on one side of the light emitting device module and scattering light projected from the light emitting device module, and provided on the first surface of the light guide plate A diffuser plate for diffusing light emitted from the light guide plate, a reflector plate provided on a second surface of the light guide plate to totally reflect the light lost from the light guide plate into the light guide plate, and a bottom at which the light emitting device module, the light guide plate, the diffuser plate, and the reflecting plate are fixed And a cover, wherein the bracket includes: a backlight unit having a protrusion formed at at least two places, and the protrusion inserted into a groove formed in the bottom cover;
A panel realizing an image by the light projected by the optical system; And
And a color filter provided on the front surface of the panel and selectively transmitting any one of red, green, and blue light. A light emitting device module including a bracket provided with a light emitting device module, a light guide plate provided on one side of the light emitting device module and scattering light projected from the light emitting device module, and provided on the first surface of the light guide plate A diffuser plate for diffusing light emitted from the light guide plate, a reflector plate provided on a second surface of the light guide plate to totally reflect the light lost from the light guide plate into the light guide plate, and a bottom at which the light emitting device module, the light guide plate, the diffuser plate, and the reflecting plate are fixed And a cover, wherein the batam chassis comprises: a backlight unit surrounding the bracket at at least two places;
A panel realizing an image by the light projected by the optical system; And
And a color filter provided on the front surface of the panel and selectively transmitting any one of red, green, and blue light.

Images