TWM471539U - Direct-type backlight module - Google Patents

Description

Direct type backlight module

The present invention relates to a backlight module, and in particular to a direct type backlight module.

In the current display device market, liquid crystal display devices (LCDs) have been widely used in various large, medium, and small-sized terminal display devices because of their light weight, small size, and thin thickness. Since the liquid crystal panel itself in the liquid crystal display device does not emit light, it is required to provide a backlight to achieve the display function. The backlight is generally provided by a backlight module, and the existing backlight module can be classified into an edge-lit backlight module according to different structures. And a direct type backlight module.

Due to the excellent performance of the direct-lit backlight module, it is one of the most widely used backlight forms, and is widely used in backlight systems for liquid crystal display devices, outdoor advertising light boxes, and indoor lighting fixtures, etc., and is cost-effective and optically stable. Good quality and other advantages. The basic structure of the direct type backlight module includes a light source disposed at the bottom of the module, an optical member (such as a diffusion plate, a diffusion sheet, a prism sheet, and the like) disposed at the top of the module, and a support column disposed between the light source and the optical member. The support column structure provides a certain height of the light mixing cavity for the light source, thereby obtaining a uniform planar backlight.

The existing support column is usually fixed on the back plate by the fixing structure and the hole position on the back plate, so the back plate needs to be punched for the position of the support column. When changing the design of the light source arrangement, it is necessary to adjust the hole on the back plate so that the support column penetrates into the fixing hole, so that the risk of the hole position colliding with other structural parts is generated, and the flexibility of the backlight design is also reduced.

Another common support column fixing method is to set the support column on the light bar, the light source (such as the light emitting diode) is disposed on the light bar, the light bar is suspended above the back plate, and the support column is fixed through the hole on the light bar. On the light bar, the fixed structure of the support column passes through the light bar and is sandwiched between the back plate and the light bar. This structure improves the flexibility of the backlight design, but is limited by the fixed structure of the support column, and the light bar cannot be closely attached to the back plate, which directly causes the heat dissipation effect of the backlight module to be deteriorated and the light mixing cavity to be thickened.

In view of this, the purpose of this creation is to propose a direct-lit backlight module, in order to improve the heat dissipation effect and reduce the height of the mixing cavity, and to make the assembly easier, and at the same time increase the strength to make the overall structure more reliable.

In order to achieve the above objectives, the present invention proposes a direct type backlight module including an optical film, a back plate, a light bar and a support column. The light bar comprises a substrate and a light emitting unit, the substrate is disposed close to the back plate, the support column is located between the optical film and the back plate, and the bottom of the support column is fixed on the substrate.

In an embodiment of the present invention, the light emitting unit includes a plurality of light emitting diodes (LEDs).

In an embodiment of the present invention, the substrate is provided with a tapered hole, and the bottom of the supporting column further extends with a clamping block corresponding to the tapered hole, and the clamping block is engaged with the tapered hole and tightly fitted to each other.

In an embodiment of the present invention, the aperture of the tapered hole gradually increases in a direction away from the support post.

In an embodiment of the present invention, the height of the card block is not greater than the thickness of the substrate.

In an embodiment of the present invention, the block is integrally formed with the support post.

In another embodiment of the present invention, the bottom of the support column is further extended with a platform structure, and the platform structure, the substrate and the back plate are respectively provided with corresponding screw holes, and the support column, the light bar and the back plate pass through the The screw holes are locked to each other.

In still another embodiment of the present invention, the bottom of the support column is further extended with a claw, the substrate is provided with a wedge-shaped groove, the wedge-shaped groove corresponds to the claw, and the claw is clamped to the wedge-shaped groove.

In an embodiment of the present invention, the support column is formed of a transparent material, and further, the light transmittance of the support column is greater than 50%.

The direct-lit backlight module proposed by the present invention has a light bar closely attached to the back plate to improve the heat dissipation effect of the structure. In addition, the bottom of the support column is fixed on the substrate of the light bar and does not exceed the thickness of the substrate, which improves the design flexibility of the backlight module and reduces the height of the light mixing cavity.

There are three types of embodiments in which the support column is fixed to the light bar. One of the bases of the support bar is provided with a tapered hole, and the bottom of the support column is matched with the tapered hole and the tapered hole is tightly matched; The platform structure has corresponding screw holes respectively on the platform structure, the substrate and the back plate, and the support column, the light bar and the back plate are locked and fixed to each other through the screw holes; one is a claw at the bottom of the support column, and the light bar corresponds to The jaws are provided with wedge-shaped grooves, and the support columns clamp the wedge-shaped grooves of the light bar through the claws. Compared with the prior art, the present invention improves the design flexibility of the backlight module, improves the heat dissipation effect, reduces the height of the light mixing cavity, and further makes assembly easier and more reliable, and has both positioning and orientation. Features.

To make the objects, features, and advantages of the present invention more comprehensible to those of ordinary skill in the art, the following description of the preferred embodiments and the accompanying drawings are set forth below.

1‧‧‧Optical diaphragm

2‧‧‧Light strips
21‧‧‧Substrate
211‧‧‧ cone hole
212‧‧‧Wedge groove
22‧‧‧Lighting unit
3‧‧‧ Backboard
4‧‧‧Support column
41‧‧‧ card block
42‧‧‧ platform structure
43‧‧‧Claws
5‧‧‧ screw holes

FIG. 1 is a schematic diagram of a direct type backlight module according to a preferred embodiment of the present invention.
Figure 2 is a partial cross-sectional view showing the assembly column and the light bar of a preferred embodiment of the present invention.
Figure 3 is a schematic view of a support column of a preferred embodiment of the present invention.
Figure 4 is a schematic view of a support post having a screw hole in another preferred embodiment of the present invention.
FIG. 5 is a schematic view showing the assembly of the support column, the light bar and the back plate according to another preferred embodiment of the present invention.
Figure 6 is a front elevational view of the support post, the light bar and the back plate of Figure 5.
Figure 7 is a top plan view of a light bar having a wedge-shaped groove in accordance with still another preferred embodiment of the present invention.
Figure 8 is a cross-sectional view showing the assembly column and the light bar of another preferred embodiment of the present invention.

Please refer to FIG. 1 to FIG. 3 . FIG. 1 to FIG. 3 show a direct type backlight module according to an embodiment of the present invention and related structures. The direct type backlight module comprises an optical film 1, a light bar 2, a back plate 3 and a support column 4. The light bar 2 includes a substrate 21 and a light emitting unit 22. In the embodiment, the light emitting unit 22 is a light emitting diode (LED), and the substrate 21 is a printed circuit board (PCB), but is not limited thereto. A plurality of light emitting units 22 are disposed above the substrate 21 and face the optical film 1, and the substrate 21 is disposed close to the back sheet 3, that is, there is no barrier or significant separation between the substrate 21 and the back sheet 3. The support column 4 is located between the optical film 1 and the back plate 3, the bottom of the support column 4 is fixed on the substrate 21, and the top of the support column 4 abuts the optical film 1, whereby the optical film 1 and the back plate 3 And a light mixing cavity is formed between the light bars 2.

The substrate 21 is provided with a tapered hole 211. The aperture of the tapered hole 211 is gradually increased in a direction away from the support column 4, and the tapered hole 211 penetrates through the substrate 21. Therefore, the tapered hole 211 forms a small opening above the substrate 21 on the substrate. A larger opening is formed below the 21 . The bottom of the support column 4 further extends with a block 41 corresponding to the tapered hole 211. The block 41 and the support post 4 have a neck corresponding to a smaller opening above the tapered hole 211, so the block 41 can be It is easy to be engaged and fixed in the tapered hole 211 and is not easy to come out, and the block 41 and the tapered hole 211 are tightly fitted to each other. The height of the block 41 is not greater than the thickness of the substrate 21. In the embodiment, the height of the block 41 corresponds to the depth of the tapered hole 211. When the block 41 is caught in the tapered hole 211, the block 41 does not extend beyond the substrate. 21, therefore, the substrate 21 can be in close contact with the backing plate 3 without causing a gap between the substrate 21 and the backing plate 3 due to the protrusion of the blocking block 41. In the present embodiment, the block 41 is integrally formed with the support post 4, the support post 4 is formed of a transparent material, and further, the light transmittance of the support post 4 is greater than 50%. In addition to this, the cylindrical portion of the support column 4 can be of any geometric configuration.

Please refer to FIG. 4 to FIG. 6 . FIG. 4 to FIG. 6 are examples of the direct type backlight module of FIG. 1 to FIG. 3 , and further propose another support column 4 and a light bar 2 of the present invention. An embodiment of the backing plate 3. The bottom of the support column 4 is further extended with a platform structure 42. The platform structure 42, the substrate 21 and the back plate 3 are respectively provided with corresponding screw holes 5, and the corresponding screws (not shown) are inserted into the screw holes 5 The support post 4, the light bar 2 and the back plate 3 are detachably fixed to each other through the screw and the screw hole 5, and the bottom end of the screw does not exceed the bottom of the substrate 21 of the light bar 2.

Please refer to FIG. 7 and FIG. 8 . FIG. 7 and FIG. 8 are examples of the direct type backlight module of FIGS. 1 to 3 , and further propose a support column 4 and a light bar 2 . Example. The base plate 21 of the light bar 2 is provided with a wedge-shaped groove 212. The bottom of the support column 4 further extends with a claw 43 corresponding to the claw 43. The claw 43 is clamped to the wedge groove 212, and the bottom of the claw 43 The end does not exceed the bottom of the substrate 21 of the light bar 2.

In summary, the direct-lit backlight module proposed by the present invention has a light bar closely attached to the back plate, and there is no obstruction or significant separation between the light bar and the back plate, so the light-emitting diode on the light bar is The heat generated during operation can be transmitted to the backboard faster, and the heat dissipation effect of this structure is good. In addition, a support column is arranged between the light bar and the optical film, and a light mixing cavity is formed between the light bar and the optical film through the support column, and the bottom of the support column is fixed on the substrate of the light bar, thereby improving the backlight module. Design flexibility, and the bottom of the support column does not exceed the thickness of the substrate, that is, it does not protrude under the substrate, so that the substrate can be closely attached to the back plate, thus reducing the height of the light mixing cavity.

In the present invention, there are three types of embodiments in which the support post is fixed to the light bar. One of the bases of the light bar is provided with a tapered hole. The diameter of the tapered hole gradually increases away from the support column, and the bottom of the support column corresponds to the tapered hole. The arranged block is tightly fitted with the tapered hole, and the structure makes the assembly of the backlight module easier. The bottom of the support column is a platform structure, and corresponding screw holes are respectively arranged on the platform structure, the substrate and the back plate, and the support column, the light bar and the back plate are locked and fixed to each other through the screw holes, and the structure makes the support column The structural strength of the light bar is more reliable. A claw is arranged at the bottom of the support column, and the light bar is provided with a wedge-shaped groove corresponding to the claw, and the support column is clamped to the wedge groove of the light bar by the claw, so that the fixing is more firm. Compared with the prior art, the direct-lit backlight module of the present invention improves the design flexibility of the backlight module, has better heat dissipation effect, and reduces the height of the light mixing cavity of the backlight module. Moreover, the creation is not only simpler to assemble. The strength is more reliable, and it has both positioning and orientation functions.

Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and anyone skilled in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of protection is subject to the definition of the scope of the patent application.

1‧‧‧Optical diaphragm

2‧‧‧Light strips

21‧‧‧Substrate

22‧‧‧Lighting unit

3‧‧‧ Backboard

4‧‧‧Support column

Claims (10)

A direct type backlight module includes:
An optical film and a back sheet;

a light bar comprising a substrate and a light emitting unit, the substrate being disposed adjacent to the back plate;

A support column is disposed between the optical film and the back plate, and a bottom of the support column is fixed on the substrate.
The direct type backlight module of claim 1, wherein the light emitting unit comprises a plurality of light emitting diodes. The direct type backlight module of claim 1, wherein the substrate is provided with a tapered hole, and a bottom of the supporting column further extends with a card block corresponding to the tapered hole, the block The taper holes are engaged and tightly fitted to each other. The direct type backlight module of claim 3, wherein the aperture of the tapered hole is gradually increased in a direction away from the support column. The direct type backlight module of claim 3, wherein the height of the card block is not greater than the thickness of the substrate. The direct type backlight module of claim 3, wherein the card block is integrally formed with the support column. The direct-type backlight module of claim 1, wherein the bottom of the support column is further provided with a platform structure, and the platform structure, the substrate and the back plate are respectively provided with corresponding screw holes. The support column, the light bar and the back plate are locked and fixed to each other through the screw holes. The direct type backlight module of claim 1, wherein the bottom of the support column further extends with a claw, the substrate is provided with a wedge-shaped groove corresponding to the claw, the claw clamp Fastened to the wedge groove. The direct type backlight module of any one of claims 1 to 8, wherein the support column is formed of a transparent material. The direct type backlight module according to any one of claims 1 to 8, wherein the support column has a light transmittance of more than 50%.