CN1322365C - Backlight module - Google Patents

Abstract

A backlight module includes: a back plate; the light-emitting units are arranged on the back plate at a spacing distance and consist of a plurality of light-emitting elements and a substrate bearing the light-emitting elements; and the rigid substrate is arranged between the two adjacent light-emitting units, and two sides of the rigid substrate are respectively partially overlapped on the adjacent light-emitting units, wherein when the rigid substrate is fixed on the backboard, the rigid substrate provides a pressing force to fix the adjacent light-emitting units on the backboard. The invention is to stack a rigid base plate part between every two parallel light-emitting units in the backlight module, and form corresponding broken holes on the rigid base plate and the back plate, when the screw is passed through the broken hole and locked on the nut on the other side of the back plate, each light-emitting unit is fixed on the back plate because of the force of pressing provided by the rigid base plate, therefore, the backlight module of the invention provides a fixing device of light-emitting units which is firmly combined and reduces the complexity and cost in assembling.

Description

Backlight module

(1) Technical field

The invention relates to a fixing device, in particular to a fixing device for a light-emitting unit in a backlight module.

(2) Background technology

In the prior art, reference is made to FIG. 1 for the method for fixing the light-emitting unit in a backlight module in a liquid crystal display. The backlight module 1 is mainly composed of a backplane 11 and several light-emitting units 12 arranged in parallel on the backplane 11 at a distance, and each light-emitting unit 12 includes several light-emitting elements 121 and carries the light-emitting elements 121 The aluminum substrate 122; wherein, the light-emitting element 121 is directly welded and assembled on the conductive circuit (not shown in the figure) on the aluminum substrate 122, and the heat energy generated during operation is conducted to the backplane 11 through the aluminum substrate 122 to escape .

Continuing to refer to FIG. 1 , the method used to fix the light-emitting unit 12 in the prior art is to first form a plurality of corresponding holes (not shown in the figure) on the aluminum substrate 122 and the back plate 11, and then use a screw 141 to pass through them. The aluminum substrate 122 and the backboard 11 are provided with perforations, and are locked together with a nut (not shown) on the other side of the backboard 11 , thereby fixing the light emitting unit 12 on the backboard 11 .

But because the material of the aluminum substrate 122 is relatively soft, it is easy to produce gaps on its contact surface when it is fixed on the backplane 11, which hinders the heat dissipation; The technical solution is to use high-density screws 141 and nuts, but this not only increases the complexity and time of assembling the backlight module, but also increases the production cost.

(3) Contents of the invention

In view of the above-mentioned prior art, the method used to fix the light-emitting unit in the backlight module in the prior art cannot provide a stable combination and reduce the complexity and cost of assembly. Therefore, a light-emitting unit is provided here. The fixing device of the unit and the backlight module using the fixing device aim to firmly fix the light-emitting unit on the backplane in the backlight module, simplify the assembly steps and reduce the use of fixing components such as screws and nuts .

The object of the present invention is achieved in the following way: a backlight module, comprising: a backboard; several light-emitting units arranged on the backboard at a distance, and the light-emitting unit is composed of several light-emitting elements and a substrate carrying the light-emitting element; and a rigid substrate, the rigid substrate is arranged between two adjacent light-emitting units, and the two sides are respectively partially laminated on the adjacent light-emitting units , wherein, when the rigid substrate is fixed on the backboard, a pressing force is provided to fix the adjacent light-emitting units on the backboard.

Effect of the present invention:

In the backlight module of the present invention, a rigid substrate is partially stacked between every two light-emitting units arranged in parallel in the backlight module, and corresponding perforations are formed on the rigid substrate and the backplane, allowing the screws to pass through the perforations. When locked on the nut on the other side of the backboard, the rigid substrate provides a pressing force to fix the adjacent light-emitting units on the backboard. Using the rigid substrate to fix the light-emitting unit can not only help transfer the heat generated by the light-emitting unit to the backplane, but also simplify and reduce the use of screws and nuts in the assembly steps of the entire backlight module. Therefore, the present invention provides a light-emitting unit fixing device that is firmly combined and reduces the complexity and cost of assembly.

In order to further illustrate the above-mentioned purpose, structural features and effects of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings.

(4) Description of drawings

FIG. 1 is a schematic diagram of a three-dimensional structure of a light-emitting unit fixed by screws and nuts in a backlight module in the prior art;

2A to 2B are three-dimensional structural schematic diagrams of a light-emitting unit in a rigid substrate fixed backlight module provided according to a specific embodiment of the present invention;

FIG. 2C is a schematic perspective view of a thermal pad provided between the substrate and the backplane according to other specific embodiments of the present invention;

FIG. 2D is a three-dimensional schematic diagram of a heat dissipation part provided on the backplane according to other specific embodiments of the present invention; and

FIG. 2E is a schematic perspective view of a reflective plate disposed on a light emitting unit and a rigid substrate according to another embodiment of the present invention.

Explanation of the symbols of the main components in the accompanying drawings:

1. Backlight module 11. Backplane 12. Light-emitting unit 121. Light-emitting element

122, aluminum base plate 141, screw 2, backlight module 21, back plate

211, hole 22, light emitting unit 221, light emitting element 222, substrate

23, light-emitting element 2231, base 23, rigid substrate 231, hole

232, concave part 241, screw 242, nut 25, thermal pad

26. Heat sink 27. Reflector 271. Perforated hole

(5) specific implementation

The following is a detailed description of the implementation of the backlight module of the present invention according to the accompanying drawings. The description of the backlight module and the light-emitting unit itself in the following description does not include the description of the detailed structure, composition and operating principle. The prior art is only cited here with emphasis to help explain the present invention. Moreover, the drawings of the relevant light emitting units in the following texts are not drawn according to the actual scale, and their function is only to express the characteristics of the present invention. Secondly, when each element or structure in the drawings of the embodiments of the present invention is described, it should not be regarded as a limited cognition, that is, when the following description does not particularly emphasize the limitation on the number, the spirit of the present invention and The scope of application can be extended to structures where several components or structures coexist.

A specific embodiment according to the present invention provides a structure for fixing a light emitting unit in a backlight module. Referring first to FIG. 2A , a backlight module 2 is mainly composed of a backplane 21 and several light emitting units 22 arranged in parallel on the backplane 21 at a distance, and each light emitting unit 22 includes several light emitting elements. 221 and the substrate 222 carrying these light-emitting elements 221; wherein, the light-emitting elements 221 can be selected from common light-emitting elements such as light-emitting diodes (LEDs), and welded on the substrate 222, and on the substrate 222, in addition to laying out conductive circuits (Fig. (not shown) and carry the light-emitting element 221 , it can also be selected from an aluminum substrate or other printed circuit boards with better thermal conductivity, so that the heat generated by the light-emitting element 221 can be conducted to the back plate 21 .

Continuing to refer to FIG. 2A , the device for fixing the light-emitting unit 22 provided by this embodiment utilizes a rigid substrate 23 and a fixing element, and corresponding perforations 211 are formed on the back plate 21 and the rigid substrate 23 (No. Two perforations) and 231 (the first perforation), wherein the first perforation 231 is formed on the recess 232 of the rigid substrate 23; wherein, the rigid substrate 23 can be selected from a galvanized steel plate or stainless steel plate, and at the center A recess 232 protruding toward the back plate 21 and attached to the back plate 21 is formed. The arrangement direction of the recess 232 is parallel to the arrangement direction of the substrate 222 ; in addition, the fixing element can be a combination of sets of screws 241 and nuts 242 .

2B, when the rigid substrate 23 is moved and placed on two adjacent substrates 222, both sides of the rigid substrate 23 with excellent rigidity partially overlap with the adjacent substrates 222, so when the screw 241 passes through When the hole 231 on the recess 232 and the hole 211 on the back plate 21 are locked together with the nut (not shown), the rigid substrate 23 can be fixed on the back plate 21, and at this time the rigid substrate 23 The provided pressing force can fix the adjacent substrates 222 on the backplane 21 . In addition, in this embodiment, the screw 241 is fixed on the nut 242 through the holes 211 and 231, but in other embodiments according to the present invention, the holes formed on the back plate can be used as Instead of a screw hole, at this time, the screw can be directly locked in the screw hole on the back plate after passing through the hole on the rigid base plate, and can also fix the rigid base plate on the back plate. Therefore, the light-emitting unit 22 can be fixed in the backlight module 2 by adopting the fixing mechanism provided by the above-mentioned embodiment, and the heat energy generated by the light-emitting element 221 during operation can also be conducted to the rigid substrate 23 through the substrate 222 to increase the effect of heat dissipation. And reduce the usage of screws 241 and nuts.

In order to reduce the gap between the substrate 222 and the backplane 21, in other embodiments according to the present invention, as shown in FIG. pad) to increase the contact area to improve the effect of heat dissipation, and the heat conduction pad 25 can also buffer the tolerance produced between the substrate 222 and the backplane 21 in material fabrication.

In addition, the backplane 21 in the backlight module 2 provided by the present invention, in addition to being attached to a heat conduction pad 25 to increase heat dissipation efficiency, referring to the second figure D, the backplane itself can include a heat dissipation part 26, which can also The heat energy generated by the light emitting element 221 is effectively discharged.

On the other hand, in the backlight module 2, a reflective element can be added depending on the characteristics of the light emitting element. For example, with reference to FIG. 2E , when other embodiments of the present invention adopt a side emitting type (side emitting) light-emitting element 223, a reflector 27 must be formed in the light-emitting unit 22; several corresponding sides are formed on the reflector 27. The position of the emission-type light-emitting element 223 and the hole 271 slightly larger than the range of the base 2231 of the light-emitting element 223, so that when the reflector 27 covers the substrate 222 in the light-emitting unit 22 and the rigid substrate 23 provided by the present invention, The edge-emitting light-emitting element 223 can pass through the hole 271 to protrude out of the reflection plate 27 , and the side light generated by it can also utilize the effect of the reflection plate 27 to produce a uniform light output effect.

Those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention, rather than as a limitation to the present invention, as long as within the scope of the spirit of the present invention, the above-described embodiments Changes and modifications will fall within the scope of the claims of the present invention.

Claims (9)

1. module backlight is characterized in that comprising:

One backboard;

Several luminescence units are to be arranged on the described backboard with a spacing distance, and described luminescence unit is made up of several light-emitting components and the substrate that carries described light-emitting component; And

One rigid substrates, rigid substrates is to be arranged between two adjacent described luminescence units, and both sides are that the part pressure is folded on adjacent described luminescence unit respectively, wherein, when described rigid substrates is fixed on the described backboard, provides the strength of a pressing and adjacent described luminescence unit is fixed on the described backboard.

2. module backlight as claimed in claim 1 is characterized in that described rigid substrates is to be selected from galvanized steel plain sheet or corrosion resistant plate.

3. module backlight as claimed in claim 1, it is characterized in that on the described rigid substrates it being to have a recess, and the bottom surface of described recess fits in described backboard, and described rigid substrates and described backboard, also comprise one first holes and one second holes respectively, it is characterized in that described first holes is to form on the described recess, described second holes is then corresponding with described first holes.

4. module backlight as claimed in claim 3 also comprises a nut and a screw, runs through described first holes and second holes via described screw, and is locked on the described nut, to fix described rigid substrates on described backboard.

5. module backlight as claimed in claim 3 is characterized in that described second holes is to be a screw, be locked on described second holes after making a screw run through described first holes, with fixing described rigid substrates on described backboard.

6. module backlight as claimed in claim 1 also comprises a heat conductive pad and is arranged between described substrate and the described backboard.

7. module backlight as claimed in claim 1 also comprises a reflecting plate, is to be stacked and placed on the described rigid substrates.

8. module backlight as claimed in claim 7, it is characterized in that described reflecting plate also comprises a holes, be to be formed on the described reflecting plate, so that described light-emitting component must wear described holes and be exposed to outside the described reflecting plate corresponding to this luminous element position.

9. module backlight as claimed in claim 1 is characterized in that described backboard also includes a radiating part.

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