TW201348818A - Backlight module and liquid crystal display device - Google Patents

Abstract

The present invention provides a backlight module and a liquid crystal display. The backlight module includes a light source, a light guide plate, a reflective film, and a frame. The frame includes a bottom plate and a side wall. The reflective film and the light guide plate are 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 reflective film includes a main body sandwiched between the bottom plate and the light guide plate and an extending portion adjacent to the light source. The extending portion includes a first opening corresponding to the emitting element. The bottom plate includes a second opening, The light emitting element passes through the first opening and is disposed on the side of the incident surface of the light guide plate. The base is fixed to the extending portion and is exposed through the second opening at 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, a reflective sheet, and a frame. The frame includes a back plate and a side wall. The reflective sheet and the light guide plate are sequentially disposed on the back plate, and the light source is disposed in the light guide plate. On the glossy side, the light source includes a substrate and a light-emitting element fixed to the substrate. The reflective sheet includes a main body portion sandwiched between the light guide plate and the back plate and an extending portion extending toward a side of the light source, the extending portion including a first opening corresponding to the light emitting element, and the back plate corresponding to the extending portion The position of the light-emitting element is disposed on a side of the light-incident surface of the light guide plate through the first opening, and the base body is fixed on the extension portion and faces away from the back plate through the second opening One side of the light panel is exposed.

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, a reflective sheet and a frame, the frame comprising a back plate and a side wall, the frame The light-receiving sheet and the light-guiding plate are disposed on the light-receiving surface of the light-guiding plate, and the light source comprises a base body and a light-emitting element fixed on the base body. The reflective sheet includes a main body portion sandwiched between the light guide plate and the back plate and an extending portion extending toward a side of the light source, the extending portion including a first opening corresponding to the light emitting element, and the back plate corresponding to the extending portion The position of the light-emitting element is disposed on a side of the light-incident surface of the light guide plate through the first opening, and the base body is fixed on the extension portion and faces away from the back plate through the second opening One side of the light panel is exposed.

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 second opening of the back plate and the first opening of the extending portion of the reflective sheet, and the replacement light source can be loaded. Therefore, the backlight module and the liquid crystal display device of the present invention are more convenient to replace the light source without disassembling the entire backlight module or the liquid crystal display device.

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 an optical film 13 , a light guide plate 14 , a light source 15 , a reflection sheet 16 , a first frame 17 , and a second frame 18 . The first frame 17 includes a back plate 171 and sidewalls 172 extending perpendicularly along the edge of the back plate 171 for carrying and receiving the reflective sheet 16, the light guide plate 14, the light source 15, and the optical film 13. The reflective sheet 16 , the light guide plate 14 , and the optical film 13 are sequentially disposed on the back plate 171 . The light source 15 is disposed on one side of the light guide plate 14 . Specifically, the light guide plate 14 includes a light incident surface 141 , a light exit surface 142 adjacent to the light incident surface, and a bottom surface 143 opposite to the light exit surface 142 . The light source 15 is disposed on the side of the light incident surface 141. The reflective sheet 16 is disposed on the bottom surface 143 side, and the optical film 13 is disposed on the light emitting surface 142 side. The second frame 18 is configured to fix the backlight module 12 with the first frame 17 and to carry the liquid crystal display panel 11 between the optical film 13 and the liquid crystal display panel 11 and A frame 17 snap fit.

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 area (not labeled) corresponding to the light emitting element 152 and a peripheral area around the light source setting area ( Not marked). The light-emitting element 152 may be a light-emitting diode, and the light-emitting surface 155 is opposite to the light-incident surface 141 of the light guide plate 14.

The reflection sheet 16 includes a main body portion 161 sandwiched between the light guide plate 14 and the back plate 171, and an extending portion 162 extending toward a side where the light source 15 is located. The extension 162 includes a first surface 163, a second surface 164 on the opposite side, and a first opening 165 extending through the first surface 163 and the second surface 164 and corresponding to the light-emitting element 152. The first surface 163 is located on a side of the reflective sheet 16 adjacent to the light guide plate 14 , and the second surface 164 is located on a side of the reflective sheet 16 adjacent to the back sheet 171 . The shape of the extending portion 162 may be a rectangle. The shape of the first opening 165 may also be a rectangle having a width substantially matching the width of the light emitting element 152. The widths of the widths of the first opening 165 and the light-emitting element 152 are both in the direction perpendicular to the light-incident surface 141.

The position of the back plate 171 corresponding to the extension portion 162 includes the second opening 173. The shape of the second opening 173 may also be a rectangle, the size of which may be substantially the same as the shape of the outer shape of the extending portion 162, and the second opening 173 is larger than the first opening 165, so that the second surface 164 of the extending portion 162 It may be exposed through the second opening 173. The side wall 172 can be provided with a snap member 174, such as a card slot, for mating with the second frame 18. Preferably, the material of the first frame 17 is metal.

The base 151 of the light source 15 is placed in the second opening 173 and fixed to the extension 162 by a fixing member. The light-emitting element 152 of the light source 15 can be disposed on the light-incident surface 141 of the light guide plate 14 through the first opening 165, and the light-emitting surface 155 is opposite to the light-incident surface 141 of the light guide plate 14. Specifically, the base 151 may be attached to the extension portion 162 by a glue, or the base 151 may be locked to the extension portion 162 by a fastener such as a screw. In this embodiment, the base 151 is received in the second opening 173, and the peripheral area of the first surface 153 is attached to the second surface 164 of the extending portion 162 exposed through the second opening 173 through the colloid 19. .

The second frame 18 is a hollow frame structure, and includes four side walls 181 which are connected end to end and a support plate 182 extending from the inner surface of the four side walls 181 toward the inner side of the second frame 18. The material is preferably plastic. The outer surface of the four side walls 181 may include a snap member 183, such as a bump, that cooperates with the first frame 17, and the support plate 182 is used to carry the liquid crystal display panel 11.

When the backlight module 12 is assembled, the reflective sheet 16, the light guide plate 14, and the optical film 13 are sequentially placed on the back plate 171, and the second surface 164 of the extending portion 162 of the reflective sheet 16 is 164. After the second opening 173 is exposed, the second frame 18 is buckled with the first frame 17. Finally, the peripheral region of the base 151 of the light source 15 is correspondingly fixed to the second opening 173 (eg, by glue). The second surface 164 of the extending portion 162 is attached or affixed by the fastener, and the light-emitting element 152 is disposed on the light-incident surface 141 of the light guide plate 14 through the first opening 165, and the light-emitting element 152 is The light emitting surface 155 is opposite to the light incident surface 141 of the light guide plate 14.

When the light source needs to be replaced, an external force is applied or the fastener is removed to disengage the base 151 from the extending portion 162, and an external force is further applied to take the base 151 out of the second opening 173, and the light emitting element 152 is from the first opening. The 165 is detached, thereby taking out the light source 15 that needs to be replaced. Further, the peripheral region of the base 151 of the replacement light source 15 is correspondingly fixed to the second surface 164 of the extension portion 162 (eg, by glue attachment or by a fastener) through the second opening 173 while the light-emitting element 152 is The first opening 165 is disposed on the light incident surface 141 of the light guide plate 14 , and the light emitting surface 155 of the light emitting element 152 is directly opposite to the light incident surface 141 of the light guide plate 14 .

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 second opening 173 of the back plate 171 and the first opening 165 of the extending portion 162 of the reflective sheet 16 can be The light source 15 is taken out and the replacement light source 15 is inserted without disassembling 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 base 251 of the fixed light-emitting element 252 is a double-sided printed printed circuit board, and the printed circuit board is also used for driving. The liquid crystal display panel 21 performs screen display. Specifically, a side of the first surface 253 of the base 251 is printed with a conductive line electrically connected to the light-emitting element 252 for transmitting an electrical signal to the light-emitting element 252. The second surface 254 of the base 251 is printed with a driving line and is disposed. There are driving elements 29 (such as driving chips, electronic components such as resistors and capacitors) for driving the liquid crystal display panel 21 for screen display.

Compared with the first embodiment, the liquid crystal display device 20 is provided on the printed circuit board for driving the liquid crystal display panel 11, and the light source can be integrated with the printed circuit board, thereby reducing components and facilitating assembly.

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. . . Liquid crystal display device

11, 21. . . LCD panel

12. . . Backlight module

13. . . Optical diaphragm

14. . . Light guide

15. . . light source

16. . . A reflective sheet

17. . . First frame

18. . . Second frame

141. . . Glossy surface

142. . . Glossy surface

143. . . Bottom

151, 251. . . Matrix

152, 252. . . Light-emitting element

153, 163, 253. . . First surface

154, 164, 254. . . Second surface

155. . . Luminous surface

161. . . Main body

162. . . Extension

165. . . First opening

171. . . Backplane

172, 181. . . Side wall

173. . . Second opening

174, 183. . . Fastener

182. . . Support plate

19. . . colloid

29. . . Drive component

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.

10. . . Liquid crystal display device

11. . . LCD panel

13. . . Optical diaphragm

14. . . Light guide

18. . . Second frame

141. . . Glossy surface

151. . . Matrix

152. . . Light-emitting element

155. . . Luminous surface

161. . . Main body

162. . . Extension

171. . . Backplane

172. . . Side wall

182. . . Support plate

19. . . colloid

Claims (10)

A backlight module includes a light source, a light guide plate, a reflective sheet, and a frame. The frame includes a back plate and a side wall. The reflective sheet and the light guide plate are sequentially disposed on the back plate, and the light source is disposed in the light guide plate. On the light side, the light source includes a base body and a light emitting element fixed on the base body, wherein the reflective sheet includes a main body portion sandwiched between the light guide plate and the back plate and an extension extending toward a side of the light source The extending portion includes a first opening corresponding to the light-emitting element, and the position of the backing plate corresponding to the extending portion includes a second opening, the light-emitting element is disposed on a side of the light-incident surface of the light guide plate through the first opening, and The base body is fixed to the extension portion and exposed through the second opening from a side of the back plate facing away from the light guide plate. The backlight module of claim 1, wherein the substrate is attached to the extension by a glue. The backlight module of claim 2, wherein the first surface of the substrate to which the light-emitting element is fixed comprises a peripheral region around the light-emitting element, the peripheral region being attached to the extension by a glue. The backlight module of claim 3, 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. The backlight module of claim 4, wherein the substrate further comprises a second surface disposed opposite to the first surface, the second surface being provided with a screen for driving the liquid crystal display panel for display Drive component. The backlight module of claim 1, wherein the base body is locked to the extension by a locking member. 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, a reflective sheet and a frame, the frame comprising a back plate and a side wall, the frame The light-receiving sheet and the light-guiding plate are disposed on the light-receiving surface of the light-guiding plate, and the light source comprises a base body and a light-emitting component fixed on the base body, wherein the reflective sheet comprises a clip a main portion between the light guide plate and the back plate and an extending portion extending toward a side of the light source, the extending portion includes a first opening corresponding to the light emitting element, and the position of the back plate corresponding to the extending portion includes a second An opening, the light emitting element is disposed on a side of the light incident surface of the light guide plate, and the base body is fixed on the extending portion, and is exposed through the second opening from a side of the back plate facing away from the light guide plate . The liquid crystal display device of claim 7, wherein the first surface of the substrate to which the light-emitting element is fixed includes a peripheral region around the light-emitting element, the peripheral region being attached to the extension by a gel. The liquid crystal display device of claim 8, 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. The liquid crystal display device of claim 9, wherein the substrate further comprises a second surface disposed away from the first surface, the second surface being provided with a screen for driving the liquid crystal display panel for display Drive component.