TW201418841A - Display device and backlight module thereof - Google Patents

Abstract

A backlight module including a light guide plate, a light source and a bezel is provided. The light source is disposed at side of the light guide plate. The bezel includes a bottom, a sidewall and at least one extending structure. The bottom carries the light guide plate and the light source. The sidewall is disposed adjacent to the light source. The sidewall has a fist end and a second opposite to the first end and the first end is connected the bottom. The extending structure extends from portion of the second end of the sidewall and the extending structure to keep away from direction of the light source. The extending structure has a supporting portion and the sidewall is disposed between the supporting portion and the light source.

Description

Display device and backlight module thereof

The present invention relates to a display device and a backlight module thereof, and more particularly to a display device and a backlight module thereof that effectively prevent light emitted from a light source from leaking from a back frame.

With the development of the electronics industry, liquid crystal display devices have become the mainstream in the market. However, since the display panel of the liquid crystal display device cannot emit light by itself, a backlight module as a light source must be provided under the display panel, thereby enabling the liquid crystal display device to achieve display efficiency.

The backlight module of the liquid crystal display device includes a back frame, a light source, a light guide plate, an optical film, and a reflection sheet. The back frame is used for accommodating the light source, the light guide plate, the optical film and the reflection sheet, and the back frame also has the function of clamping the light guide plate, thereby fixing the light guide plate. The light source is disposed on one side of the light guide plate for emitting light to the light guide plate for mixing. The liquid crystal display device further includes a driving circuit board disposed at a bottom of the backlight module, specifically, a bottom portion of the back frame, and the driving circuit board is electrically connected to the display panel for driving the display panel.

However, in order to reduce the overall thickness of the liquid crystal display device, a carrying platform for carrying the driving circuit board is usually bent from a part of the bottom surface and a part of the side surface of the back frame, so that the driving circuit board can be disposed on the side of the backlight module, which is effective. Reduce the thickness of the overall liquid crystal display device. However, since the carrying platform is bent from a part of the bottom surface and a part of the side surface of the back frame, a notch is formed on the side surface of the back frame, so that the light emitted by the light source leaks out from the notch, and in order to prevent light from leaking out from the gap, generally Manually bonding the foam tape to cover the gap on the side of the back frame, such as As a result, the cost of the foam tape is additionally increased, and it is not easy to align when the foam tape is adhered, and the gap on the side of the back frame may not be effectively covered. Moreover, since part of the side surface of the back frame is used as a carrying platform for carrying the driving circuit board, the overall strength of the back frame is inevitably lowered. Therefore, how to solve and improve the above problems is one of the focuses of the technical field.

One of the objects of the present invention is to provide a backlight module to prevent light emitted from a light source from leaking out of the back frame, resulting in a decrease in light extraction efficiency.

It is still another object of the present invention to provide a display device for preventing light emitted from a light source from leaking out of a backlight module, resulting in a decrease in light extraction efficiency.

To achieve the above advantages, the present invention provides a backlight module including a light guide plate, a light source, and a back frame. The light source is disposed on one side of the light guide plate. The back frame includes a bottom, a side wall, and at least one extension structure. The bottom is for carrying the light guide plate and the light source. The side wall is adjacent to the light source. The side wall has opposite first and second ends, and the first end is connected to the bottom. The extension structure extends from a portion of the first end of the sidewall away from the source. The extension structure has a bearing portion, and the side wall is located between the carrier portion and the light source.

In an embodiment of the invention, the extension structure further has a connecting portion for connecting the first end of the side wall and the carrying portion.

In an embodiment of the invention, the connecting portion and the side wall form a U-shape.

In an embodiment of the invention, the connecting portion and the side wall form a V-shape.

In an embodiment of the invention, the connecting portion of the extending structure and the side wall have a fixing body for fixing the connecting portion to the side wall.

In an embodiment of the invention, the sessile body comprises a colloid or a solder.

In an embodiment of the invention, the back frame further includes a top portion connected to the second end of the sidewall, the top portion having the opposite first surface and the second surface, and the second surface The face faces the bottom, the first surface faces away from the bottom, and the bearing surface of the bearing portion faces the same direction as the first surface.

In an embodiment of the invention, a light source accommodating space is formed between the top, the bottom and the inner side of the side wall for accommodating the light source.

In an embodiment of the invention, the bottom of the back frame has a hollowed out area adjacent to the extended structure, and the extended structure is folded outward from the hollowed out area.

In an embodiment of the invention, the area of the hollowed out region is substantially equal to the area of the extended structure.

In an embodiment of the invention, the back frame further includes a light shielding colloid, which is attached to the bottom and covers the hollowed out area.

In order to achieve the above advantages, another aspect of the present invention provides a display device including a display panel, a circuit board, and a backlight module. The circuit board is electrically connected to the display panel. The backlight module is disposed relative to the display panel, and the backlight module includes a light guide plate, a light source, and a back frame. The light source is disposed on one side of the light guide plate. The back frame includes a bottom, a side wall, and at least one extension structure. The bottom is for carrying the light guide plate and the light source. The side wall is adjacent to the light source, and the side wall has opposite first and second ends, and the first end is connected to the bottom. The extension structure extends from a first end of the side wall away from the light source, and the extension structure has a carrying portion, the side wall is located between the bearing portion and the light source, and the carrying portion is used for carrying the circuit board.

In the display device of the embodiment of the invention, the back frame of the backlight module has a bottom, a side wall and at least one extending structure. The extension structure extends from a portion of the first end of the side wall away from the light source, and the side wall is located between the carrier portion of the extension structure and the light source. The extension structure of the embodiment of the present invention extends from one end of the side wall of the back frame, that is, the extension structure does not form a gap on the side wall of the back frame. Under such a structural design, the light source can be effectively avoided. The emitted light leaks from the side wall of the back frame without adding extra cost and manpower. The action of preventing light leakage is performed, and the overall strength of the back frame is relatively increased.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Please refer to FIG. 1 , which is a cross-sectional view of a display device according to an embodiment of the invention. As shown in FIG. 1 , the display device 1 of the present embodiment includes a display panel 10 , a circuit board 11 , and a backlight module 12 . The circuit board 11 is electrically connected to the display panel 10, and the circuit board 11 is electrically connected to the display panel 10 through the flexible circuit board 110, but the invention is not limited thereto.

The backlight module 12 of the present embodiment is disposed relative to the display panel 10, and the backlight module 12 is, for example, an edge-lit backlight module. However, the present invention is not limited thereto, and the backlight module 12 can also be a direct-lit backlight module. group. The backlight module 12 of the embodiment includes a light guide plate 120, a light source 121, and a back frame 122. The light source 121 is disposed on one side of the light guide plate 120 . Specifically, the light source 121 is disposed beside the light incident surface 1200 of the light guide plate 120 . The back frame 122 includes a bottom portion 1220, side walls 1221, and at least one extension structure 1222. The bottom portion 1220 is configured to carry the light guide plate 120 and the light source 121. The side wall 1221 is adjacent to the light source 121, and the side wall 1221 has opposite first ends 1223 and second ends 1224, and the first end 1223 of the side walls 1221 is connected to the bottom portion 1220. The extension structure 1222 extends from a portion of the first end 1223 of the sidewall 1221 toward the direction X. Specifically, the extension structure 1222 extends away from the light source 121. The extension structure 1222 has a carrying portion 1225 for carrying the circuit board 11 , and the side wall 1221 is located between the carrying portion 1225 and the light source 121 .

It should be noted that the backlight module of the embodiment further includes an optical film, a reflective sheet (not shown) and the like. But since these components are in the present invention This is not a main technical feature, and therefore, the present invention is not described separately for the above components.

As shown in FIG. 1 , the extension structure 1222 of the embodiment further has a connecting portion 1226 for connecting the first end 1223 of the sidewall 1221 and the carrying portion 1225 . As shown in FIG. 1, the connecting portion 1226 and the side wall 1221 of the extending structure 1222 are, for example, U-shaped, and the connecting portion 1226 of the extending structure 1222 is substantially perpendicular to the carrying portion 1225 and forms an L-shape with the carrying portion 1225.

As shown in FIG. 1, the back frame 122 of the present embodiment further includes a top portion 1227 connected to the second end 1224 of the side wall 1221. This top portion 1227 has opposing first and second surfaces 1201, 1202. The second surface 1202 of the top portion 1227 faces the bottom portion 1220, the first surface 1201 of the top portion 1227 is facing away from the bottom portion 1220, and the bearing surface 1203 of the carrier portion 1225 faces the same direction as the first surface 1201 of the top portion 1227. In detail, the accommodating space S1 for accommodating the circuit board 11 is defined between the first surface 1201 of the top portion 1227 and the bearing surface 1203 of the carrying portion 1225. In addition, a light source accommodating space S2 for accommodating the light source is formed between the top portion 1227, the bottom portion 1220 of the back frame 122 and the inner side of the side wall 1221.

Please refer to FIG. 1 and FIG. 2. FIG. 2 is a schematic bottom perspective view of the display device shown in FIG. As shown in FIG. 1 and FIG. 2, the bottom portion 1220 of the back frame 122 of the present embodiment has a hollowed out region 1228 adjacent to the extended structure 1222, and the extended structure 1222 is folded outward from the hollowed out region 1228. Specifically, the bearing portion 1225 and the connecting portion 1226 of the extending structure 1222 are originally part of the bottom portion 1220 of the back frame 122, and the area of the bottom portion 1220 of the back frame 122 needs to be intercepted as an extension structure according to actual production requirements. 1222, that is, the area of the hollow structure 1228 described in this embodiment is substantially equal to the area of the extended structure 1222. For example, the area of the hollow structure 1228 is A1, and the area of the bearing portion 1225 and the connecting portion 1226 of the extending structure 1222 is divided into Don't be A2 and A3, then A1=A2+A3.

It should be particularly noted that since the extension structure 1222 is folded outward from the hollow region 1228, the bending portion of the extension structure 1222 may enlarge the overall area due to the ductility of the back frame 122 material, FIG. 1 and FIG. 2 The area of the bearing portion 1225 and the connecting portion 1226 of the illustrated extension 1222 and the area A2, A3 of the connecting portion 1226 may be slightly larger than the area of the hollow structure 1228, but the area before the extending structure 1222 is folded is substantially equal to the hollow structure 1228. area.

Please refer to FIG. 3, which is a cross-sectional view of a display device according to another embodiment of the present invention. The display device 1a shown in FIG. 3 is similar to the display device 1 shown in FIG. 1 except that the connecting portion 1226 and the side wall 1221 of the extending structure 1222a of the present embodiment constitute a V-shape, for example, and the connecting structure of the extending structure 1222a. An angle θ is sandwiched between the portion 1226 and the carrying portion 1225, and the angle θ is, for example, an obtuse angle. It should be particularly noted that the shape formed by the connecting portion 1226 and the side wall 1221 of the extending structures 1222 and 1222a shown in FIGS. 1 and 3 and the shape and angle formed by the connecting portion 1226 and the carrying portion 1225 are only the present invention. For the examples, the invention is not limited thereto. On the premise that the carrying portion 1225 can be used to carry the circuit board 11, the shape formed by the connecting portion 1226 and the side wall 1221 and the shape and angle formed by the connecting portion 1226 and the carrying portion 1225 can be any shape change.

Please refer to FIG. 4, which is a cross-sectional view of a display device according to another embodiment of the present invention. The display device 1b shown in FIG. 4 is similar to the display device 1 shown in FIG. 1, except that the connecting portion 1226 and the side wall 1221 of the extending structure 1222 of the present embodiment have a fixing body 13. The effect of the fixing body 13 is to enable the connecting portion 1226 of the extending structure 1222 to be fixed to the side wall 1221, thereby increasing the structural strength of the extending structure 1222, and avoiding deformation or breakage of the extending structure 1222 after being subjected to collision. The fixing body 13 described in this embodiment is, for example, a colloid or a solder, but it is not limited thereto, as long as the extending structure 1222 can be made. The fixing material of the connecting portion 1226 fixed to the side wall 1221 can be selected.

Please refer to FIG. 5 , which is a cross-sectional view of a display device according to another embodiment of the present invention. The display device 1 c shown in FIG. 5 is similar to the display device 1 shown in FIG. 1 , except that the embodiment is The back frame 122 includes a light shielding gel 14 . The visor 14 is attached to the bottom portion 1220 of the back frame 122 and covers the hollowed out region 1228. The visor 14 is, for example, a light-shielding tape or any colloid having a light-shielding effect, but the invention is not limited thereto. The effect of the light shielding colloid 14 described in this embodiment is to prevent a slight amount of light from leaking out through the hollowed out region 1228. It should be noted that the structure of the back frame 122 of the backlight module 12 according to the embodiment of the present invention can effectively prevent light leakage without being attached to the light-shielding body 14 in the hollow region 1228, and is attached to the hollow region 1228. The light-shielding gel 14 is only more effective in preventing light leakage, and is not necessarily a means of implementation.

In summary, in the display device of the embodiment of the present invention, the back frame of the backlight module has a bottom, a sidewall, and at least one extending structure. The extension structure extends from a portion of the first end of the side wall away from the light source, and the side wall is located between the carrier portion of the extension structure and the light source. The extension structure of the embodiment of the present invention extends from one end of the bottom wall of the back frame, that is, the extension structure does not form a gap on the side wall of the back frame. Under such a structural design, the effective structure can be effectively The light emitted by the light source is prevented from leaking from the side wall of the back frame, and no additional cost and manpower are required to prevent the light leakage, and the overall strength of the back frame is relatively increased.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

1, 1a, 1b, 1c‧‧‧ display device

10‧‧‧ display panel

11‧‧‧ boards

12‧‧‧Backlight module

13‧‧‧ sessile body

14‧‧‧Shading colloid

110‧‧‧Soft circuit board

120‧‧‧Light guide

121‧‧‧Light source

122‧‧‧ Back frame

1200‧‧‧Into the glossy surface

1201‧‧‧ first surface

1202‧‧‧ second surface

1203‧‧‧ bearing surface

1220‧‧‧ bottom

1221‧‧‧ side wall

1222, 1222a‧‧‧ extension structure

1223‧‧‧ first end

1224‧‧‧second end

1225‧‧‧ Carrying Department

1226‧‧‧Connecting Department

1227‧‧‧ top

1228‧‧‧ hollow area

X‧‧‧ direction

S1‧‧‧ accommodating space

S2‧‧‧Light source space

A1, A2, A3‧‧‧ area

Θ‧‧‧ angle

1 is a cross-sectional view of a display device according to an embodiment of the invention.

FIG. 2 is a schematic bottom perspective view of the display device shown in FIG. 1. FIG.

3 is a cross-sectional view showing a display device according to another embodiment of the present invention.

4 is a cross-sectional view showing a display device according to another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a display device according to another embodiment of the present invention.

1‧‧‧ display device

10‧‧‧ display panel

11‧‧‧ boards

12‧‧‧Backlight module

110‧‧‧Soft circuit board

120‧‧‧Light guide

121‧‧‧Light source

122‧‧‧ Back frame

1200‧‧‧Into the glossy surface

1201‧‧‧ first surface

1202‧‧‧ second surface

1203‧‧‧ bearing surface

1220‧‧‧ bottom

1221‧‧‧ side wall

1222‧‧‧Extended structure

1223‧‧‧ first end

1224‧‧‧second end

1225‧‧‧ Carrying Department

1226‧‧‧Connecting Department

1227‧‧‧ top

1228‧‧‧ hollow area

X‧‧‧ direction

S1‧‧‧ accommodating space

S2‧‧‧Light source space

Claims (12)

A backlight module includes: a light guide plate; a light source disposed on one side of the light guide plate; and a back frame, including: a bottom portion for carrying the light guide plate and the light source; and a side wall adjacent to the light source And the side wall has a first end and a second end, the first end is connected to the bottom; and at least one extending structure, the first end extending from the side of the side wall away from the light source The extension structure has a bearing portion between the carrier portion and the light source. The backlight module of claim 1, wherein the extension structure further has a connecting portion for connecting the first end of the side wall and the carrying portion. The backlight module of claim 2, wherein the connecting portion and the side wall form a U-shape. The backlight module of claim 2, wherein the connecting portion and the side wall form a V-shape. The backlight module of claim 2, wherein the connecting portion of the extending structure and the side wall have a fixing body for fixing the connecting portion to the side wall. The backlight module of claim 5, wherein the fixing body comprises a gel or a solder. The backlight module of claim 1, wherein the back frame further comprises a top portion connected to the second end of the side wall, the top portion having an opposite one The first surface and the second surface face the bottom portion, and the first surface faces away from the bottom portion, and one of the bearing portions faces the same direction as the first surface. The backlight module of claim 7, wherein a light source accommodating space is formed between the top portion, the bottom portion and the inner side of the side wall for accommodating the light source. The backlight module of claim 1, wherein the bottom of the back frame has a hollowed area adjacent to the extended structure, and the extended structure is folded outward from the hollowed out area. The backlight module of claim 9, wherein the hollowed out area has an area substantially equal to an area of the extended structure. The backlight module of claim 9, wherein the back frame further comprises a light shielding colloid attached to the bottom and covering the hollowed out area. A display device includes: a display panel; a circuit board electrically connected to the display panel; and a backlight module disposed relative to the display panel, the backlight module includes: a light guide plate; a side of the light guide plate; and a back frame, comprising: a bottom portion for carrying the light guide plate and the light source; a side wall adjacent to the light source, and the side wall has a first end and a second end The first end is connected to the bottom portion; and the at least one extending structure extends from a portion of the side wall in a direction away from the light source, the extending structure having a carrying portion, the side wall being located at the carrying portion The carrier is used to carry the circuit board between the light sources.