JP2009266796A - Reflective back plate and direct backlight module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reflective back plate applied to a backlight module which has a light source group. <P>SOLUTION: The reflective back plate has a housing and a reflective sheet. The housing has at least one opening. The reflective sheet is attached in the housing. The reflective sheet has a reflective layer and a heat dissipation layer, and the reflective layer and the heat dissipation layer consist of a different material, respectively. The reflective layer has a reflective surface and a back surface which faces the reflective surface, a recess which holds a light source group is formed on the reflective surface, and the heat dissipation layer is arranged at the back surface of the reflective layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reflective back plate, and more particularly to a reflective back plate used for a direct type backlight module of a liquid crystal display.

  In recent years, liquid crystal displays have features such as light weight, thinness, small size, and energy saving, and they are widely applied to electronic video products such as notebook computers, digital cameras, and televisions, and gradually become more common for cathode ray tube (CRT) displays. I am trying to replace it.

  The liquid crystal display mainly includes two parts, a liquid crystal panel and a backlight module. The liquid crystal panel achieves the purpose of displaying an image by changing the amount of light passing through each region through rotation of liquid crystal molecules and a polarizing plate, creating a difference between light and dark in each region. Since the liquid crystal itself does not have light emission characteristics, it is necessary to provide a light source by a backlight module. The backlight module is classified into two types, a direct type and an edge type, depending on the position of the light source. Among them, the direct type has a high luminance because the light source is arranged directly under the liquid crystal display panel, and is often used for large-sized display devices such as monitors and liquid crystal televisions.

  Currently, in the application of liquid crystal displays, more and more liquid crystal displays are wall-mounted and applied to walls or outdoor signboards, so that the weight reduction of liquid crystal displays has a certain market. In the liquid crystal display, the backlight module is an important part. The direct type backlight module includes a housing, an optical film sheet, a diffusion plate, a light source assembly fixing member, a light source assembly, a base plate for the diffusion plate and the light source, a reflection sheet, a back plate, a voltage converter, a protective cover for the voltage converter, and the like. Among these components, the back plate accounts for more than half of the total weight of the backlight module. Therefore, the trend of weight reduction of the liquid crystal display is determined by reducing the weight of the back plate.

  FIG. 1 is a view showing a back plate of a conventional direct type backlight module. As shown in FIG. 1, the conventional back plate 100 is made of a metal sheet material having a large area. This is a single sheet material generally formed by processing a steel material, and other components of the backlight module are mounted and used as a structure for fixing, positioning and heat dissipation in the backlight module. Further, the back plate 100 should prevent light leakage by providing a large area material and provide a heat dissipation function, which is a main cause that the liquid crystal display cannot be reduced in weight efficiently.

  The present invention provides a reflective back plate that is used in a backlight module to reduce the weight of the backlight module.

  The present invention provides a direct type backlight module having a low weight.

  Other objects and advantages of the present invention can be further known from the technical features disclosed in the present invention.

  In order to achieve one or a part or all of the above-described objects or other objects, the reflective back plate according to the embodiment of the present invention is applied to a backlight module having a light source set. The reflective back plate has a housing and a reflective sheet. The housing has at least one opening. The reflection sheet is attached in the housing. The reflection sheet has a reflection layer and a heat dissipation layer, and the reflection layer and the heat dissipation layer are made of different materials. The reflection layer has a reflection surface and a back surface opposite to the reflection surface, a recess for accommodating the light source set is formed on the reflection surface, and the heat dissipation layer is disposed on the back surface of the reflection layer.

  A backlight module according to another embodiment of the present invention includes a casing, a reflective sheet, and a light source set. The housing has at least one opening. The reflection sheet is attached in the housing. The reflection sheet has a reflection layer and a heat dissipation layer, and the reflection layer and the heat dissipation layer are made of different materials. The reflective layer has a reflective surface and a back surface opposite to the reflective surface, a recess is formed in the reflective surface, and the heat dissipation layer is disposed on the back surface of the reflective layer. The light source set is accommodated in the recess of the reflection sheet.

  In the embodiment of the present invention, the casing is formed by folding a thin plate, and the thickness of the heat dissipation layer is thinner than that of the thin plate.

  In the embodiment of the present invention, the housing is formed by connecting a plurality of edge beams.

  In an embodiment of the present invention, one of the plurality of edge beams is formed by folding a thin plate, and the thickness of the heat dissipation layer is thinner than the thin plate.

  In an embodiment of the present invention, a plurality of adjacent edge beams are welded or fixed together.

  In an embodiment of the present invention, the housing further includes at least one support beam straddling the opening, and both ends of the support beam are respectively connected to two of the plurality of edge beams.

  In an embodiment of the present invention, the support beam is formed by folding a thin plate, and the thickness of the heat dissipation layer is thinner than that of the thin plate.

  In an embodiment of the present invention, aluminum is included as a material for the housing.

  In an embodiment of the present invention, the housing material includes plastic.

  In an embodiment of the present invention, the housing further includes a heat dissipation sheet, and the heat dissipation sheet is connected to the housing and covers a part of at least one opening.

  In the embodiment of the present invention, the light source group is a fluorescent lamp group.

  As described above, in the embodiment of the present invention, the purpose of reducing the weight of the reflective back plate is achieved by using a housing having an opening and attaching the reflective layer and the heat radiating layer to each other to attach to the housing. The layer provides light shielding, holding and heat dissipation functions for the reflective layer.

  In order to make the above features and advantages of the present invention clearer and easier to understand, a number of examples are given below and described in detail with reference to the drawings.

  Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, so that the foregoing and other techniques, features and advantages of the present invention may be more readily understood.

  The following description of each example illustrates a specific example in which the invention may be practiced with reference to the accompanying drawings. The terms mentioned in the present invention, such as “top”, “bottom”, “front”, “back”, “left”, “right”, etc., merely refer to directions in the drawings. Accordingly, the directional terms used are for purposes of describing the present invention and are not intended to limit the present invention.

  FIG. 2 is an exploded view of a reflective back plate according to an embodiment of the present invention, and FIG. 3 is an assembled view of the reflective back plate shown in FIG. Referring to FIGS. 2 and 3, in this embodiment, the reflective back plate 200 is used in a backlight module of a liquid crystal display. The reflective back plate 200 includes a casing 210 and a reflective sheet 220. The housing 210 has an opening 210a. The reflection sheet 220 is attached in the housing 210.

  The reflection sheet 220 includes a reflection layer 222 and a heat dissipation layer 224. The reflective layer 222 has a reflective surface 222a and a back surface 222b opposite to the reflective surface 222a, and the reflective surface 222a is formed with a recess 220a for accommodating a light source set (420 in FIG. 6). The heat dissipation layer 224 is located on the back surface 222 b of the reflective layer 222. In addition, the heat dissipation layer 224 may be disposed on all or part of the back surface 222b of the reflective layer 222 depending on circumstances.

  In this embodiment, the heat dissipation layer 224 is formed on the reflective layer 222 by a method such as sticking, thermocompression bonding, coating, electroplating, or vapor deposition. Conversely, the reflective layer 222 may be formed on the heat dissipation layer 224 by a method such as sticking, thermocompression bonding, coating, electroplating, or vapor deposition. Further, the reflective layer 222 is configured using a reflective material, and the heat dissipation layer 224 is configured using a metal or other heat dissipation material.

  4 is an exploded view of the housing shown in FIG. Referring to FIG. 4, the housing 210 is configured by joining a plurality of edge beams 212, and the joined housing 210 has an opening 210 a, thereby reducing the weight of the reflective backplate 200, Reduce the weight occupancy in the backlight module and realize the purpose of weight reduction. In this embodiment, these edge beams 212 are formed by folding a thin plate made of aluminum, and these edge beams 212 adjacent to each other are fixed to each other via a fixing member, or a method such as laser, electrode mutual welding, or the like. Connect together. In other embodiments (not shown), these edge beams 212 may be made of a plastic material.

  2 and 4, the case 210 further includes at least one support beam 214 straddling the opening 210a, and the support beam 214 is welded or fixed to these edge beams 212 to each other. Increase the structural strength of the body 210. Compared to the steel plate of the prior art, the support beam 214 according to the present embodiment is more easily subjected to structural strengthening processing such as providing a deep rib (when the cross-sectional structure is “convex” type) on the support beam 214, for example. In the present embodiment, the support beam 214 may be formed by folding a thin aluminum plate. In addition, the cross-sectional structure of the support beam 214 has a shape such as a “convex” shape or a “work” shape, thereby increasing the structural strength of the housing 210. In other embodiments (not shown), plastic may be used as the material for the support beam 214.

  In this embodiment, the casing 210 replaces the steel plate used in the prior art by manufacturing the support beam 214 and the edge beam 212 using a thin plate made of aluminum. The housing 210 maintains the original structural strength as a main structure for fixing and positioning in the backlight module, and can mount a related member of the backlight module such as a light source set on the casing 210. Further, the influence of the conventional back plate being excessively heavy due to the shape or material can be reduced, and the weight of the reflective back plate 200 can be reduced.

  In the present embodiment, the thickness of the heat dissipation layer 224 may be thinner than the above-described thin plate that is folded to form the edge beam 212 and the support beam 214. The heat dissipation layer 224 is suitable for weight reduction and reduces thermal deformation of the reflective layer 222. Accordingly, the heat dissipation layer 224 not only provides a light shielding effect to the reflection layer 222 but also helps the heat dissipation of the reflection layer 222, reduces the thermal deformation of the reflection layer 222, and is still flat even when the reflection layer 222 receives heat. So that the light is reflected uniformly.

  FIG. 5 is a view showing a housing according to another embodiment of the present invention. As shown in FIG. 5, the casing 310 in this embodiment uses a plastic material to replace the steel material used in the prior art and achieves the effect of weight reduction. The casing 310 is integrally formed by a process such as plastic injection molding.

  In this embodiment, the housing 310 further includes at least one heat radiation sheet 316 coupled to the housing 310 and covers a part of the opening 310 a of the housing 310. The heat dissipation sheet 316 efficiently absorbs heat generated when the backlight module functions. In the present embodiment, the fixing member of the light source set that supplies a voltage while fixing the light source set is provided at both end portions of the housing 310, so that the heat radiation sheet 316 is provided close to the both end portions of the housing 310. It is preferable.

  FIG. 6 is a view illustrating a direct type backlight module according to another embodiment of the present invention. As shown in FIG. 6, the direct type backlight module 400 in the present embodiment includes a reflective back plate 410 and a light source set 420. The reflective back plate 410 corresponds to the reflective back plate 200 of FIG. 3, and the light source set 420 is provided inside the concave portion 410 a of the reflective back plate 410 as a source for providing light to the direct type backlight module 400. The recess 410a corresponds to the recess 220a in FIG. In this embodiment, the light source set 420 is a fluorescent lamp set such as a cold cathode fluorescent lamp (CCFL).

  As described above, in the above-described embodiment of the present invention, the object of reducing the weight of the reflective back plate is achieved by using the casing having an opening and attaching the reflective layer and the heat dissipation layer to the casing. The heat-dissipating layer provides light-shielding, holding, and heat-dissipating functions for the reflective layer.

  The housing can be manufactured by joining together a plurality of beams (edge beams and support beams) formed by folding aluminum thin plates, or can be integrally formed of a plastic material. The housing may be manufactured by connecting a plurality of beams (edge beams and support beams) made of plastic.

  Although the present invention is disclosed by the best embodiments, it is not limited to these contents, and various changes and modifications can be made by those skilled in the art within the spirit and scope of the present invention. Based on the claims. Moreover, any embodiment or claim of the present invention need not necessarily realize all of the objects, advantages, or features disclosed by the present invention. Further, the abstract part and the title of the invention are merely for assisting the search work of patent documents, and do not limit the scope of rights of the present invention.

It is a figure which shows the backplate of the conventional direct type | mold backlight module. FIG. 4 is an exploded view of a reflective back plate according to an embodiment of the present invention. FIG. 3 is an assembly view of the reflective back plate of FIG. 2. It is a disassembled perspective view of the housing | casing shown by FIG. It is a figure which shows the housing | casing by the other Example of this invention. FIG. 6 is a view illustrating a direct type backlight module according to another embodiment of the present invention.

Explanation of symbols

100, back plate 200, reflective back plate 210, housing 210a, opening 212, edge beam 214, support beam 220, reflective sheet 220a, recess 222, reflective layer 222a, reflective surface 222b, back surface 224, heat radiation layer 310, housing 310a, opening 316, heat dissipation sheet 400, direct type backlight module 410, reflective back plate 410a, recess 420, light source set

Claims (20)

A reflective backplate applied to a backlight module having a light source set,
A housing having at least one opening, and a reflective sheet attached in the housing and having a reflective layer and a heat dissipation layer made of different materials,
The reflective layer has a reflective surface and a back surface facing the reflective surface, a concave portion for accommodating the light source set is formed on the reflective surface, and the heat dissipation layer is disposed on the back surface of the reflective layer.
Reflective back plate characterized by that.   The reflective back plate according to claim 1, wherein the casing is formed by folding a thin plate, and the heat dissipation layer is thinner than the thin plate.   The reflective back plate according to claim 1, wherein the casing is formed by connecting a plurality of edge beams.   4. The reflective back plate according to claim 3, wherein at least one of the plurality of edge beams is formed by folding a thin plate, and the thickness of the heat dissipation layer is thinner than the thin plate.   4. The reflection according to claim 3, wherein the housing further includes at least one support beam straddling the opening, and both ends of the support beam are respectively connected to two of the plurality of edge beams. Back plate.   6. The reflective back plate according to claim 5, wherein the support beam is formed by folding a thin plate, and the thickness of the heat dissipation layer is thinner than that of the thin plate.   The reflective back plate according to claim 1, wherein aluminum is included as a material of the casing.   The reflective back plate according to claim 1, wherein the casing is made of plastic.   The reflective back plate according to claim 1, wherein the housing further includes a heat radiating sheet, and the heat radiating sheet covers a part of the at least one opening. A housing having at least one opening,
A reflective sheet attached in the housing and having a reflective layer and a heat dissipation layer made of different materials,
The reflective layer has a reflective surface and a back surface facing the reflective surface, a concave portion is formed in the reflective surface, the heat dissipation layer is disposed on the back surface of the reflective layer, and in the concave portion of the reflective sheet Including a light source set housed in
This is a direct type backlight module.   The direct type backlight module according to claim 10, wherein the casing is integrally formed.   11. The direct type backlight module according to claim 10, wherein the casing is formed by folding a thin plate, and the thickness of the heat dissipation layer is thinner than the thin plate.   The direct type backlight module according to claim 10, wherein the casing is formed by connecting a plurality of edge beams.   14. The direct type backlight module according to claim 13, wherein one of the plurality of edge beams is formed by folding a thin plate, and the thickness of the heat dissipation layer is thinner than that of the thin plate.   The immediately lower portion according to claim 13, wherein the housing further includes at least one support beam straddling the opening, and both ends of the support beam are respectively connected to two of the plurality of edge beams. Type backlight module.   16. The direct type backlight module according to claim 15, wherein the support beam is formed by folding a thin plate, and the heat dissipation layer is thinner than the thin plate.   11. The direct type backlight module according to claim 10, wherein aluminum is included as a material of the casing.   The direct type backlight module according to claim 10, wherein the casing includes a plastic.   The direct type backlight module according to claim 10, wherein the casing further includes a heat dissipation sheet, and the heat dissipation sheet covers a part of the at least one opening.   11. The direct type backlight module according to claim 10, wherein the light source group is a fluorescent lamp group.

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