TW201348819A - Backlight module and liquid crystal display device - Google Patents

Abstract

The present invention provides a backlight module and a liquid crystal display device. The backlight module includes a light source, a light guide plate, and a frame. The frame includes a bottom plate and a side wall. The light guide plate is positioned on the bottom plate. The light source is disposed on one side of a light incident surface of the light guide plate. The light source includes a base and an emitting element disposed on the base. The bottom plate includes an opening, The light emitting element passes through the opening and is disposed on the side of the incident surface of the light guide plate. The base is fixed to a side of the bottom plate far away the light guide plate.

Description

Backlight module and liquid crystal display device

The invention relates to a backlight module and a liquid crystal display device.

Liquid crystal display devices have been widely used in mobile phones, personal digital assistants, notebook computers, and televisions due to their low radiation, small size, short size, and low power consumption. Since the liquid crystal panel of the liquid crystal display device does not have the light-emitting property itself, in order to achieve the display effect, it is necessary to provide a backlight module to the liquid crystal panel to provide planar light with sufficient brightness and uniform distribution to the liquid crystal panel, thereby realizing display of the liquid crystal display device. Features.

The backlight module mainly comprises a light guide plate, a light source, a reflective sheet, and a lower frame (also referred to as a back-cover) and an auxiliary fixing plastic frame for carrying and accommodating the above-mentioned components. However, since the light source is housed in the lower frame, when the light source needs to be replaced (such as the light source is damaged), the entire backlight module must be disassembled to take out and replace the light source, that is, the existing backlight module and the liquid crystal using the backlight module. It is inconvenient to replace the light source of the display device.

In view of this, it is necessary to provide a backlight module that facilitates replacement of a light source.

It is also necessary to provide a liquid crystal display device using the backlight module.

A backlight module includes a light source, a light guide plate and a frame. The frame includes a back plate and a side wall. The light guide plate is disposed on the back plate, and the light source is disposed on a light incident surface side of the light guide plate. The light source includes a base body and a light-emitting element fixed on the base body, the back plate includes an opening corresponding to the light-emitting element, the light-emitting element is disposed on the light-incident surface side of the light guide plate through the opening, and the base body is fixed to the light-emitting element The back plate is away from one side of the light guide plate.

A liquid crystal display device comprising a liquid crystal display panel and a backlight module for providing planar light to the liquid crystal display panel, the backlight module comprising a light source, a light guide plate and a frame, the frame comprising a back plate and a side wall, wherein the light guide plate is disposed on the The light source is disposed on a side of the light incident surface of the light guide plate. The light source includes a base body and a light-emitting element fixed on the base body, the back plate includes an opening corresponding to the light-emitting element, the light-emitting element is disposed on the light-incident surface side of the light guide plate through the opening, and the base body is fixed to the light-emitting element The back plate is away from one side of the light guide plate.

Compared with the prior art, when the backlight module and the liquid crystal display device of the present invention need to replace the light source, the light source can be taken out through the opening of the back plate and the replacement light source can be assembled through the opening without disassembling the entire backlight module or liquid crystal. The display device is therefore convenient for replacing the light source of the backlight module and the liquid crystal display device of the present invention.

1 is a perspective exploded view of a liquid crystal display device 10 of the present invention, and FIG. 2 is a schematic perspective view of the liquid crystal display device 10 of FIG. A schematic cross-sectional view of the liquid crystal display device 10 taken along line III-III. The liquid crystal display device 10 includes a liquid crystal display panel 11 and a backlight module 12 disposed opposite to the liquid crystal display panel 11. The backlight module 12 provides uniform planar light to the liquid crystal display panel 11.

The backlight module 12 includes a first frame 13 , an optical film 14 , a light source 15 , a light guide plate 16 , and a second frame 17 .

The second frame 17 includes a back plate 171 and side walls 172 extending perpendicularly along the edge of the back plate 171 for carrying and receiving the light guide plate 16, the light source 15 and the optical film 14. The light guide plate 16 and the optical film 14 are sequentially disposed on the back plate 171. The light source 15 is disposed on one side of the light guide plate 16. Specifically, the light guide plate 16 includes a light incident surface 161 , a light exit surface 162 adjacent to the light incident surface 161 , and a bottom surface 163 opposite to the light exit surface 162 . The light source 15 is disposed on the side of the light incident surface 161. The optical film 14 is disposed on the side of the light exit surface 162. The bottom surface 163 is disposed on the back plate 171.

The first frame 13 is configured to fix the backlight module 12 with the second frame 17 and to carry the liquid crystal display panel 11 between the optical film 14 and the liquid crystal display panel 11 and Two frame 17 snap fit. Specifically, the first frame 13 is a hollow frame structure, and includes four side walls 131 that are connected end to end and a support plate 132 extending from the inner surface of the four side walls 131 toward the inner side of the first frame 13. The material is preferably plastic. . The outer surface of the four side walls 131 may include a locking member 133, such as a bump, that cooperates with the second frame 17, and the supporting plate 132 is used to carry the liquid crystal display panel 11.

The light source 15 includes a base 151 and a light-emitting element 152 fixed to the base 151. The base 151 is a rectangular plate-like structure, which may be a circuit board, and may be internally provided with a conductive line electrically connected to the light-emitting element 152 for transmitting an electrical signal to the light-emitting element 152. The base 151 includes a first surface 153 and a second surface 154 on the opposite side, the first surface 153 including a light source setting region (not labeled) of the corresponding light-emitting element 152 at the central portion and surrounding the light source setting region Peripheral area (not shown). The light-emitting element 152 may be a light-emitting diode, and the light-emitting surface 155 is opposite to the light-incident surface 161 of the light guide plate 16.

The back plate 171 includes a first surface 175 adjacent to the light guide plate 16 , a second surface 176 away from the light guide plate 16 and disposed away from the first surface 175 , and through the first surface 175 and the second surface 176 . The opening 173 of the light-emitting element 152 is corresponding. The shape of the opening 173 may also be a rectangle, the width of which may substantially coincide with the width of the light-emitting element 152, and the width of the opening 173 is smaller than the width of the base 151. Specifically, the width of the opening 173, the width of the light-emitting element 152, and the width of the base 151 refer to a width in a direction perpendicular to the light-incident surface 161 of the light guide plate 16. The side wall 172 can be provided with a locking member 174, such as a card slot, for mating with the first frame 13. Preferably, the material of the second frame 17 is metal. The first surface 175 has a reflective material for reflecting light to the light guide plate 16.

The light-emitting element 152 of the light source 15 can be disposed on the light-incident surface 161 of the light guide plate 16 through the opening 173, and the light-emitting surface 155 is opposite to the light-incident surface 161 of the light guide plate 16. The base 151 is then fixed to the second surface 176 of the backing plate 171 by a fixing member. Specifically, the base 151 may be attached to the second surface 176 of the back plate 171 by a glue, or the base 151 may be locked to the back plate 171 by a fastener such as a screw. In the present embodiment, the peripheral region of the first surface 153 of the base 151 is attached to the second surface 176 of the back plate 171 by the glue 18 .

When the backlight module 12 is assembled, the light guide plate 16 and the optical film 14 are sequentially placed on the back plate 171, and the first frame 13 and the second frame 17 are snap-fitted together, and finally The light-emitting element 152 of the light source 15 is disposed on the light-incident surface 161 of the light guide plate 16 through the opening 173, and the peripheral region of the base 151 is overlapped with the back plate 171, so that the base 151 is correspondingly fixed to (such as The second surface 176 of the backing plate 171 is attached by glue or by a fastener.

When the light source 15 needs to be replaced, an external force is applied or the lock is removed to disengage the base 151 from the back plate 171, and an external force is further applied to the base 151, so that the light-emitting element 152 is detached from the opening 173, thereby removing the light source that needs to be replaced. 15. Further, the light-emitting element 152 of the replacement light source 15 is disposed on the light-incident surface 161 of the light guide plate 16 through the opening 173, and the peripheral region of the base 151 is overlapped with the back plate 171, so that the base 151 corresponds to The second surface 176 of the backing plate 171 is fixed (eg, by a glue attachment or by a fastener) to complete the replacement of the light source 15.

Compared with the prior art, when the backlight module 12 and the liquid crystal display device 10 of the present invention need to replace the light source 15, the light source 15 can be taken out through the opening 173 of the back plate 171 and the replacement light source 15 can be assembled through the opening 173. Therefore, it is not necessary to disassemble the entire backlight module 12 or the liquid crystal display device 10. Therefore, the backlight module 12 of the present invention and the light source 15 of the liquid crystal display device 10 are replaced in a simple and convenient manner.

Please refer to FIG. 4, which is a cross-sectional view of a second embodiment of a liquid crystal display device 20 of the present invention. The liquid crystal display device 20 of the second embodiment of the present invention is different from the liquid crystal display device 10 of the first embodiment mainly in that the second surface 276 of the back plate 271 includes a recessed portion 277 corresponding to the base 251, and the base 251 is accommodated in the Depression. Specifically, the recessed portion 277 is located at the periphery of the opening, and the planar size of the recessed portion 277 is equal to or slightly larger than the planar size of the base 251, and the thickness is equal to or slightly larger than the thickness of the base 251. After assembly, the base 251 is completely received in the recess 277.

In the second embodiment, since the base 251 is completely accommodated in the recessed portion 277, the entire backlight module and the liquid crystal display device 20 are relatively simple and beautiful.

Please refer to FIG. 5, which is a cross-sectional view of a third embodiment of a liquid crystal display device 30 of the present invention. The liquid crystal display device 30 of the third embodiment of the present invention is different from the liquid crystal display device 20 of the second embodiment mainly in that the first surface 375 of the back plate 371 further includes a plurality of dots 378, and the light guide plate 36 is directly processed by the in-mold forming technique. Formed on the first surface 375 of the backing plate 371.

In the third embodiment, the light guide plate 36 is directly formed on the first surface 375 of the back plate 371 by the in-mold forming technology, so that the components of the backlight module can be more compactly combined. And the thickness of the liquid crystal display device 30 can be reduced.

Please refer to FIG. 6, which is a cross-sectional view of a fourth embodiment of a liquid crystal display device 40 of the present invention. The liquid crystal display device 40 according to the fourth embodiment of the present invention is different from the liquid crystal display device 20 of the second embodiment mainly in that the base 451 of the fixed light-emitting element 452 is a double-sided printed printed circuit board, and the printed circuit board is also used for driving. The liquid crystal display panel 41 performs screen display. Specifically, a side of the first surface 453 of the base 451 is printed with a conductive line electrically connected to the light-emitting element 452 for transmitting an electrical signal to the light-emitting element 452. The second surface 454 of the base 451 is printed with a driving line and is disposed. There are driving elements 49 (such as driving chips, electronic components such as resistors and capacitors) for driving the liquid crystal display panel 41 for screen display.

Compared with the second embodiment, the liquid crystal display device 40 is provided on the printed circuit board that drives the liquid crystal display panel 41, so that the light source can be integrated with the printed circuit board, thereby reducing components and facilitating assembly.

Please refer to FIG. 7, which is a cross-sectional view of a fifth embodiment of a liquid crystal display device 50 of the present invention. The liquid crystal display device 50 according to the fifth embodiment of the present invention is different from the liquid crystal display device 40 of the fourth embodiment mainly in that the base 551 is locked to the back plate 571 by a locker 58.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

10, 20, 30, 40, 50. . . Liquid crystal display device

11, 41. . . LCD panel

12. . . Backlight module

13. . . First frame

14. . . Optical diaphragm

15. . . light source

16, 36. . . Light guide

17. . . Second frame

18. . . colloid

132. . . Support plate

151, 251, 451, 551. . . Matrix

152, 452. . . Light-emitting element

153, 175, 375, 453. . . First surface

154, 176, 276, 454. . . Second surface

155. . . Luminous surface

161. . . Glossy surface

162. . . Glossy surface

163. . . Bottom

171, 271, 371, 571. . . Backplane

131, 172. . . Side wall

173. . . Opening

133, 174. . . Locking piece

277. . . Depression

378. . . Network

49. . . Drive component

58. . . Lock firmware

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view showing a first embodiment of a liquid crystal display device of the present invention.

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

Figure 3 is a cross-sectional view of the liquid crystal display device of Figure 2 taken along line III-III.

Figure 4 is a cross-sectional view showing a second embodiment of the liquid crystal display device of the present invention.

Figure 5 is a cross-sectional view showing a third embodiment of the liquid crystal display device of the present invention.

Figure 6 is a cross-sectional view showing a fourth embodiment of the liquid crystal display device of the present invention.

Figure 7 is a cross-sectional view showing a fifth embodiment of the liquid crystal display device of the present invention.

10. . . Liquid crystal display device

11. . . LCD panel

13. . . First frame

14. . . Optical diaphragm

16. . . Light guide

18. . . colloid

132. . . Support plate

151. . . Matrix

152. . . Light-emitting element

155. . . Luminous surface

171. . . Backplane

172. . . Side wall

175. . . First surface

176. . . Second surface

Claims (10)

A backlight module includes a light source, a light guide plate and a frame, the frame includes a back plate and a side wall, the light guide plate is disposed on the back plate, and the light source is disposed on a side of the light incident surface of the light guide plate, wherein the light source The substrate includes a light-emitting element fixed to the substrate, the back plate includes an opening corresponding to the light-emitting element, the light-emitting element is disposed on the light-incident surface side of the light guide plate through the opening, and the base body is fixed to the back plate Keep away from the side of the light guide. The backlight module of claim 1, wherein the substrate is attached to the surface of the back plate away from the light guide plate by a glue. The backlight module of claim 1, wherein the back plate has a recessed portion away from the surface of the light guide plate, and at least a portion of the base body is received in the recessed portion. The backlight module of claim 3, wherein the substrate is completely received in the recess. The backlight module of claim 1, wherein the substrate is locked to the surface of the back plate away from the light guide plate by a locking member. The backlight module of claim 1, wherein the back plate has a reflective material adjacent to the surface of the light guide plate for reflecting light to the light guide plate. The backlight module of claim 6, wherein the backplane further comprises a plurality of dots adjacent to the surface of the light guide plate. The backlight module of claim 7, wherein the light guide plate is directly formed on the surface of the back plate adjacent to the light guide plate by an in-mold forming technique. The backlight module of claim 1, wherein the substrate is a printed circuit board, and the printed circuit board is further configured to drive the liquid crystal display panel for screen display. A liquid crystal display device comprising a liquid crystal display panel and a backlight module for providing planar light to the liquid crystal display panel, wherein the backlight module uses the backlight module according to any one of claims 1 to 9.