TWI427369B - Backlight module and liquid crystal display - Google Patents

Description

Backlight module and liquid crystal display

The present invention relates to a light source module and a display, and more particularly to a backlight module and a liquid crystal display (LCD) using the backlight module.

With the development of the electronics industry, flat panel displays have eliminated cathode ray tube (CRT) displays and become the mainstream. In the flat panel display, the technology of the liquid crystal display is the most sophisticated and popular. However, since the liquid crystal display panel of the liquid crystal display itself cannot emit light, a backlight module must be provided under the liquid crystal display panel to provide a light source to achieve the display function.

FIG. 1 is a partially enlarged schematic structural view of a conventional backlight module. Referring to FIG. 1 , the conventional backlight module 100 includes a light guide plat (LGP) 110 , a reflector 120 , a light source 130 , and a light guide plate 110 , a reflector 120 , and a light source 130 . Frame 140. The frame 140 has a protruding portion 142, and one of the notches 112 of the light guide plate 110 corresponds to the protruding portion 142. The reflector 120 is disposed adjacent to the light incident surface 114 of the light guide plate 110 , and the light source 130 is disposed between the light guide plate 110 and the reflector 120 .

It should be noted that in the prior art, the protrusions 142 of the frame 140 and the reflector cover 120 do not easily abut each other to form a gap 102. Therefore, the light provided by the light source 130 is easily adjacent to the light guide plate 110. Leak at port 112.

The present invention provides a backlight module to improve the problem that light provided by a light source is easily leaked adjacent to a gap of the light guide plate.

The invention provides a liquid crystal display to improve the problem that the backlight module is easy to leak light near the gap of the light guide plate.

The invention provides a backlight module, which comprises a light guide plate, a reflector cover, a light source and a frame. The light guide plate has a light incident surface, a light exit surface, a bottom surface and a first gap. The first gap is located at a corner of the light guide plate and adjacent to the light incident surface. The reflector is disposed beside the light incident surface and has a first portion and a second portion. The first portion of the reflector covers a portion of the light exiting surface, and the second portion of the reflector covers a portion of the bottom surface. The light source is disposed between the reflector and the light incident surface. The frame is disposed around the light guide plate, the reflector, and the light source, and has a protrusion corresponding to the first notch. The first portion of the reflector covers a portion of the first gap.

The invention further provides a liquid crystal display comprising a liquid crystal display panel and the foregoing backlight module. The backlight module is disposed on one side of the liquid crystal display panel to provide a surface light source required for the liquid crystal display panel.

In an embodiment of the invention, the light source comprises a light tube and a sleeve. The sleeve is sleeved at one end of the tube and has a bump. The protrusion has a second notch corresponding to the protrusion, and the protrusion is disposed on the second notch and located between the protrusion and the light guide plate. The first portion of the reflector covers at least a portion of the bump. In addition, the above sleeve may have a first positioning portion, and The second portion of the reflector further has a first positioning portion corresponding to the first positioning portion. In addition, the material of the sleeve described above may include rubber. The first positioning portion is, for example, a positioning block, and the second positioning portion is, for example, a positioning hole.

In an embodiment of the invention, the frame further has a second positioning portion, and the second portion of the reflector further has a second positioning portion corresponding to the second positioning portion. The third positioning portion is, for example, a positioning block, and the fourth positioning portion is, for example, a positioning hole.

In an embodiment of the invention, the backlight module further includes a screw, and the frame further has a screw hole, and the second portion of the reflector further has a through hole corresponding to the screw hole. The screw is adapted to pass through the through hole and is locked to the screw hole.

In the backlight module and the liquid crystal display of the present invention, the first portion of the reflective cover extends from the edge of the light guide plate toward the first notch to cover a portion of the first notch. Therefore, the light provided by the light source is less likely to leak at the first gap adjacent to the light guide plate.

The above described features and advantages of the present invention will be more apparent from the following description.

2 is a perspective exploded view of a liquid crystal display according to an embodiment of the present invention, and FIG. 3 is a partially enlarged structural view of the backlight module of FIG. 2, and FIGS. 4A and 4B are partial enlarged views of the backlight module of FIG. Stereoscopic decomposition diagram. Referring to FIG. 2 , the liquid crystal display 200 includes a liquid crystal display panel 300 and a backlight module 400 . The backlight module 400 is disposed on one side of the liquid crystal display panel 300 and can be used to provide the liquid crystal display panel 300. The surface light source needed. In addition, the liquid crystal display 200 can further have a front frame 500, so that the liquid crystal display panel 300 can be more stably assembled to the backlight module 400 by the front frame 500. Next, a more detailed description will be provided below for the structure of the backlight module 400.

Referring to FIG. 3, FIG. 4A and FIG. 4B, in order to clearly illustrate the features of the present invention, FIGS. 3, 4A and 4B only illustrate one corner of the backlight module 400. The backlight module 400 includes a light guide plate 410, a reflective cover 420, a light source 430, and a frame 440. The light guide plate 410 has a light incident surface 412, a light exit surface 414, a bottom surface 416, and a first gap 418. The reflector 420 is disposed beside the light incident surface 412 , and the light source 430 is disposed between the reflector 420 and the light incident surface 412 . The light exiting surface 414 is disposed toward the liquid crystal display panel 300 (shown in FIG. 2 ), and the first notch 418 is located at a corner of the light guide plate 410 and adjacent to the light incident surface 412 .

In addition, the reflector 420 has a first portion 422a and a second portion 422b. The first portion 422a of the reflector 420 covers a portion of the light exit surface 414 and extends to the first gap 418 of the light guide plate 410 to cover a portion of the first gap 418, and the second portion 422b of the reflector 420 covers the portion. The bottom surface 416. Therefore, the light provided by the light source 430 is less likely to leak at the first gap 418 adjacent to the light guide plate 410.

Light source 430 includes, for example, a light tube 432 and a sleeve 434. The tube 432 is adapted to provide light, and the sleeve 434 is sleeved at one end of the tube 432 and has a projection 436. The material of the sleeve 434 is, for example, rubber. The frame 440 is disposed around the light guide plate 410, the reflective cover 420, and the light source 430, and has a protrusion 442 corresponding to the first notch 418. The protrusion 442 can have A second notch 444 corresponding to the bump 436. The bump 436 is disposed between the protruding portion 442 and the light guide plate 410 , and the first portion 422 a of the reflective cover 420 covers at least a portion of the bump 436 .

It should be noted that the bump 436 and the protrusion 442 are both disposed in the first notch 418. At the same time, the first portion 422a of the reflector 420 extends to the first gap 418 of the light guide plate 410 and covers at least a portion of the bumps 436. Therefore, the light provided by the light source 430 is less likely to leak at the first gap 418 adjacent to the light guide plate 410.

In addition, when the light guide plate 410 and the light source 430 are assembled in the frame 440 and the light source 430 is located under the light guide plate 410 , the first notch 418 is adjacent to the light source 430 and located at a corner below the light guide plate 410 . At this time, the protrusion 442 of the frame 440 is located in the first notch 418, so that the light guide plate 410 can bear on the protrusion 442 by the inner surface of the first notch 418, and is positioned in the frame 440. In addition, the light guide plate 410 is prevented from being pressed by the light source 430 under the external force.

In this embodiment, the light guide plate 410 has only one first notch 418, and the frame 440 has only one protrusion 442. However, in other embodiments, the light guide plate 410 may have two first notches 418, and the first notches 418 are respectively located at two corners adjacent to the light incident surface 412. At this time, the frame 440 can also have two protrusions 442 corresponding to the first notches 418, so that the light guide plate 410 can be more stably supported by the inner surface of the first notch 418 against the protrusion 442. . Of course, the light source 430 can include two sleeves 434 respectively sleeved at opposite ends of the tube 432, and the sleeves 434 can have a protrusion 436, respectively. Moreover, the first portion 422a of the reflector 420 The first notches 418 of the light guide plate 410 can be respectively extended to cover the bumps 436, thereby simultaneously improving the problem that the light provided by the lamp tubes 432 is easily leaked at the first notches 418 adjacent to the two corners of the light guide plate 410. .

In addition, the sleeve 434 can have a first positioning portion 438 (shown in FIG. 4B), and the second portion 422b of the reflective cover 420 can have a second positioning portion 424 corresponding to the first positioning portion 438. Therefore, when the light source 430 is assembled to the reflector 420, it can be positioned by the cooperation of the first positioning portion 438 and the second positioning portion 424. Furthermore, the frame 440 can have a third positioning portion 446 (shown in FIG. 4B), and the second portion 422b of the reflector 420 can further have a fourth positioning portion 426 corresponding to the third positioning portion 446. Therefore, when the reflector cover 420 is assembled to the frame 440, it can be positioned by the cooperation of the third positioning portion 446 and the fourth positioning portion 426. The first positioning portion 438 and the third positioning portion 446 of the embodiment are positioning blocks, and the second positioning portion 424 and the fourth positioning portion 426 are positioning holes. However, each positioning portion may arbitrarily select the positioning hole and the positioning block as long as they can cooperate with each other.

In addition, the backlight module 400 can further include a screw 450, and the frame 440 can have a screw hole 448 (shown in FIG. 4B), and the second portion 422b of the reflector cover 420 has a corresponding screw hole. A through hole 428 of 448 (shown in Figure 4A). Accordingly, the screw 450 can be threaded through the through hole 428 and locked to the screw hole 448 to lock the reflector 420 to the frame 440. It should be noted that the number of the first positioning portion 438, the second positioning portion 424, the third positioning portion 446, the fourth positioning portion 426, the screw 450, the screw hole 448, and the through hole 428 are for illustrative purposes only and are not intended to be limiting. this invention.

In summary, in the backlight module and the liquid crystal display of the present invention, the first portion of the reflective cover extends from the edge of the light guide plate toward the first notch to cover a portion of the first notch. Therefore, the light provided by the light source is less likely to leak at the first gap adjacent to the light guide plate. Furthermore, the bumps of the sleeve and the protrusions of the frame are disposed in the first notch, and the first portion of the reflector extends to the first notch of the light guide plate to cover at least a portion of the bumps. Therefore, the light provided by the light source is less likely to leak at the first gap adjacent to the light guide plate.

In addition, the light guide plate can be supported on the protruding portion by the inner surface of the first notch and positioned in the frame to prevent the light guide plate from being pressed against the light source under the external force. In addition, when the light source is assembled to the reflector, it can be positioned by the cooperation of the first positioning portion and the first positioning portion. Moreover, when the reflector is assembled to the frame, it can be positioned by the cooperation of the second positioning portion and the second positioning portion, and can be locked to the frame by screws.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Backlight module

102‧‧‧ gap

110‧‧‧Light guide plate

112‧‧‧ gap

120‧‧‧reflector

130‧‧‧Light source

140‧‧‧Frame

142‧‧‧Protruding

200‧‧‧LCD display

300‧‧‧LCD panel

400‧‧‧Backlight module

410‧‧‧Light guide plate

412‧‧‧Into the glossy surface

414‧‧‧Glossy surface

416‧‧‧ bottom

418‧‧‧ first gap

420‧‧‧reflector

422a‧‧‧Part 1

422b‧‧‧Part II

424‧‧‧Second Positioning Department

426‧‧‧Four Positioning Department

428‧‧‧through holes

430‧‧‧Light source

432‧‧‧ lamp

434‧‧‧Sleeve

436‧‧‧Bumps

438‧‧‧First Positioning Department

440‧‧‧Frame

442‧‧‧ protruding parts

444‧‧‧ second gap

446‧‧‧ Third Positioning Department

448‧‧‧ screw holes

450‧‧‧ screws

500‧‧‧ front box

FIG. 1 is a partially enlarged schematic structural view of a conventional backlight module.

2 is a perspective exploded view of a liquid crystal display according to an embodiment of the invention.

FIG. 3 is a partially enlarged schematic structural view of the backlight module of FIG. 2. FIG.

4A and 4B are partially enlarged perspective exploded views of the backlight module of FIG. 2.

400‧‧‧Backlight module

410‧‧‧Light guide plate

412‧‧‧Into the glossy surface

414‧‧‧Glossy surface

416‧‧‧ bottom

418‧‧‧ first gap

420‧‧‧reflector

422a‧‧‧Part 1

422b‧‧‧Part II

424‧‧‧Second Positioning Department

426‧‧‧Four Positioning Department

428‧‧‧through holes

430‧‧‧Light source

432‧‧‧ lamp

434‧‧‧Sleeve

436‧‧‧Bumps

440‧‧‧Frame

442‧‧‧ protruding parts

444‧‧‧ second gap

450‧‧‧ screws

Claims (16)

A backlight module includes: a light guide plate having a light incident surface, a light exit surface, a bottom surface, and a first notch, wherein the first gap is located at an angle of the light guide plate and adjacent to the light incident surface; a reflector disposed adjacent to the light incident surface and having a first portion and a second portion, wherein the first portion of the reflective cover covers a portion of the light exiting surface, and the second portion of the reflective cover is covered a portion of the bottom surface; a light source disposed between the reflector and the light incident surface; and a frame disposed around the light guide plate, the reflector, and the light source, and having a convex corresponding to the first gap And an outlet portion, wherein the first portion of the reflector covers a portion of the first gap. The backlight module of claim 1, wherein the light source comprises: a light tube; and a sleeve disposed at one end of the light tube, wherein the sleeve has a bump, and the protrusion The portion has a second notch corresponding to the protrusion, and the protrusion is disposed between the protrusion and the light guide plate, and the first portion of the reflector covers at least a portion of the protrusion Piece. The backlight module of claim 2, wherein the sleeve further has a first positioning portion, and the second portion of the reflective cover further has a second positioning corresponding to the first positioning portion unit. The backlight module of claim 3, wherein the first positioning portion is a positioning block, and the second positioning portion is a positioning hole. The backlight module of claim 2, wherein the material of the sleeve comprises rubber. The backlight module of claim 1, wherein the frame further has a third positioning portion, and the second portion of the reflective cover further has a fourth positioning portion corresponding to the third positioning portion. . The backlight module of claim 6, wherein the third positioning portion is a positioning block, and the fourth positioning portion is a positioning hole. The backlight module of claim 1, further comprising a screw, wherein the frame further has a screw hole, and the second portion of the reflector further has a through hole corresponding to the screw hole, wherein The screw is adapted to be locked to the screw hole through the through hole. A liquid crystal display, comprising: a liquid crystal display panel; a backlight module disposed on one side of the liquid crystal display panel for providing a surface light source required for the liquid crystal display panel, wherein the backlight module comprises: a light guide plate Having a light-incident surface, a light-emitting surface, a bottom surface, and a first gap, wherein the light-emitting surface faces the liquid crystal display panel, and the first gap is located at an angle of the light guide plate and adjacent to the light-incident surface; a cover disposed adjacent to the light incident surface and having a first portion and a second portion, wherein the first portion of the reflective cover covers a portion of the light exiting surface, and the second partial cover portion of the reflective cover a bottom surface; a light source disposed between the reflector and the light incident surface; and a frame surrounding the light guide plate, the reflector, and the light source And having a protrusion corresponding to the first gap, wherein the first portion of the reflector covers a portion of the first gap. The liquid crystal display of claim 9, wherein the light source comprises: a lamp tube; and a sleeve sleeved on one end of the lamp tube, wherein the sleeve has a bump, and the protrusion portion Having a second notch corresponding to the bump, and the bump is disposed between the protrusion and the light guide plate, and the first portion of the reflector covers at least a portion of the bump . The liquid crystal display of claim 10, wherein the sleeve further has a first positioning portion, and the second portion of the reflective cover further has a second positioning corresponding to the first positioning portions. unit. The liquid crystal display of claim 11, wherein the first positioning portion is a positioning block, and the second positioning portion is a positioning hole. The liquid crystal display of claim 10, wherein the material of the sleeve comprises rubber. The liquid crystal display of claim 9, wherein the frame further has a third positioning portion, and the second portion of the reflective cover further has a fourth positioning portion corresponding to the third positioning portion. The liquid crystal display of claim 14, wherein the third positioning portion is a positioning block, and the fourth positioning portion is a positioning hole. The liquid crystal display of claim 9, further comprising a screw, wherein the frame further has a screw hole, and the second portion of the reflector further has a through hole corresponding to the screw hole, wherein the A screw is adapted to pass through the through hole and is locked to the screw hole.