TW202202912A - Backlight module and display device - Google Patents

Abstract

A backlight module includes a back plate, a plastic frame provided on the back plate, a light emitting unit, a light guide plate, and at least one fixing unit. The light emitting unit is disposed on one side of the back plate and extends along a first direction. The fixing unit simultaneously limits the plastic frame, the back plate and the light guide plate along the first direction. The fixing unit extends in the same direction as the light-emitting unit, so the fixing unit limits the plastic frame, the back plate, and the light guide plate at the same time along the first direction, which can improve the convenience of alignment and avoid deflection during assembly, optimizing the assembly process and improving the yield. The invention also provides a display device including the backlight module.

Description

Backlight module and display device

The present invention relates to an optical device, in particular to a backlight module and a display device.

In the existing display device, a backlight module is mainly used to provide a backlight source for the display panel. The backlight modules of current display devices can be classified into direct type and edge type according to their light incident modes. Among them, the edge-type backlight module utilizes a light bar with a plurality of light-emitting diode elements, a combination of light guide plates and optical films, etc., to provide the backlight source required for the display panel.

In the existing edge-type backlight module, a plurality of positioning columns are formed on the back plate of the backlight module, and the positioning columns extend along the thickness direction (Z-axis direction) of the light guide plate, and the back of the light guide plate is provided with a plurality of positioning columns. A limit hole corresponding to the positioning column is aligned and assembled with the positioning column.

The plurality of positioning columns formed on the backplane extend perpendicular to the thickness direction of the light guide plate, so the thickness of the overall backlight module cannot meet the market demand for lightness and thinness; in addition, when assembling, the assembler cannot directly see the guide plate. Whether the limit hole on the back of the light plate is aligned with the positioning column, it is easy to cause the risk of deformation or skew of the positioning column due to misalignment during the assembly process, resulting in damage to the light guide plate or the size of the gap between the light guide plate and the light bar is unstable. , affecting the quality of the backlight module.

Therefore, the purpose of the present invention is to provide a backlight module with a novel limit design.

The backlight module of the present invention includes a backplane, a plastic frame ringed on the backplane, a light-emitting unit, a light guide plate, and at least one fixing unit. The light-emitting unit is disposed on one side of the backplane and extends along a first direction. The back plate includes a plate body and a side wall connected to the periphery of the plate body. The light guide plate is placed on the body of the back plate, and the light guide plate has a light incident surface for receiving the light of the light-emitting unit. The fixing unit simultaneously restrains the plastic frame, the backplane and the light guide plate along the first direction.

Another technical means of the present invention is that at least one first through hole is formed on the side wall of the back plate, the plastic frame includes a surrounding wall surrounding the periphery of the side wall of the back plate, and the fixing unit is formed by the plastic frame The surrounding wall integrally extends through the first through hole and abuts against the light guide plate.

Another technical means of the present invention is that the fixing unit includes a limit post.

Another technical means of the present invention is that the fixing unit further includes a reinforcing member disposed in the limiting column.

Another technical means of the present invention is that the end of the reinforcing member protrudes from the limiting column and abuts against the light guide plate.

Another technical means of the present invention is that a first through hole is formed on the side wall of the back plate, the plastic frame includes a surrounding wall surrounding the periphery of the side wall of the back plate, and a first hole and the first hole are formed on the surrounding wall. A second through hole corresponding to the through hole, the fixing unit abuts the first through hole and the second through hole to limit the light guide plate.

Another technical means of the present invention is that the second through hole of the plastic frame is formed with an inner thread, and the fixing unit is screwed to the second through hole and passes through the first through hole to limit the light guide plate.

Another technical means of the present invention is that the first through hole of the back plate is formed with an internal thread, the fixing unit passes through the second through hole and is screwed to the first through hole to limit the light guide plate.

Another technical means of the present invention is that the back plate further includes a sleeve integrally extending from the side wall, the sleeve surrounds a first through hole and has an inner thread, and the plastic frame includes a sleeve surrounding the back plate. A second through hole is formed on the surrounding wall of the peripheral edge of the side wall, the sleeve of the back plate is protruded into the second through hole, and the fixing unit is screwed with the sleeve.

Another technical means of the present invention is that at least one notch is formed on the side of the light guide plate facing the fixing unit, and the end of the at least one fixing unit is abutted in the notch.

Another technical means of the present invention is that the light guide plate has two opposite sides, the two sides respectively have a notch extending along the first direction, the number of the fixing units is two, and the ends of the two fixing units respectively abut against the two gaps.

Another object of the present invention is to provide a display device including the aforementioned backlight module and a display panel disposed on the backlight module.

The effect of the present invention is that the fixing unit and the light emitting unit extend in the same direction, so the fixing unit simultaneously restrains the plastic frame, the back panel and the light guide plate along the first direction, which can effectively avoid deflection during assembly , optimize the assembly process and improve the yield.

The features and technical contents of the relevant patent applications of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Before the detailed description, it should be noted that similar elements are designated by the same reference numerals.

Referring to FIG. 1 and FIG. 2 , it is a first preferred embodiment of the backlight module 2 of the present invention, which includes a backplane 21 , a plastic frame 22 surrounding the backplane 21 , a light-emitting unit 23 , and a light guide plate 24 , and two fixed units 25 . The light emitting unit 23 is disposed on one side of the back plate 21 and extends along a first direction X. The back plate 21 includes a plate body 211 and a side wall 212 connected to the periphery of the plate body 211 . The light guide plate 24 is placed on the plate body 211 of the back plate 21 and accommodated in the space surrounded by the plate body 211 and the side wall 212 . The light guide plate 24 has a light incident surface 241 for receiving The light of the light-emitting unit 23 . It should be noted that the light guide plate 24 has two opposite sides 242 , the two sides 242 extend along a second direction Y, and the second direction Y is perpendicular to the first direction X. As shown in FIG. As shown in FIG. 2 , each of the side edges 242 has at least one gap 243 , and the two fixing units 25 are respectively disposed corresponding to the two gaps 243 (due to the viewing angle, only one side is shown in FIG. 2 ). For example, the notch 243 can be disposed at any position or corner position on the side edge 242 of the light guide plate 24 , and the notch 243 is used for accommodating the fixing unit 25 extending along the first direction X. As shown in FIG. Preferably, the notch 243 is disposed at a corner position adjacent to the light incident surface of the light guide plate 24 to ensure that the optical appearance of the backlight module is not affected by the notch 243 . The notch 243 can also be disposed on the side edge 242 of the light guide plate 24 at the non-corner position. When the fixing unit 25 penetrates into the notch 243, the light guide plate 24 can be positioned in the first direction X and the second direction Y at the same time. limit.

Referring to FIG. 2 , two first through holes 213 corresponding to the two notches 243 of the light guide plate 24 are formed on the side wall 212 of the back plate 21 . The plastic frame 22 includes a surrounding wall 222 surrounding the periphery of the side wall 212 of the back plate 21 . In this embodiment, each fixing unit 25 includes a limiting post 251 integrally extending from the surrounding wall 222 of the plastic frame 22 .

It should be further explained that each limiting post 251 may be a hollow design as shown in FIG. 2 , or a solid design. Wherein, each limiting post 251 may be a solid structure integrally formed as shown in FIG. 3 , or a reinforcing member 252 may be wrapped in the limiting post 251 by means of injection coating, as shown in FIG. 4 . shown. In addition, the reinforcing member 252 can also be a screw as shown in FIG. 5 , which is directly inserted into the limiting post 251 in the shape of a through hole. At this time, the end of the reinforcing member 252 is protruding from the limiting post 251 And the light guide plate 24 is pressed against the light guide plate 24, so that if there is an assembly tolerance between the limit post 251 and the light guide plate 24, the tolerance between the two can also be overcome by screwing the reinforcing piece 252. , the impact of the light guide plate 24 can also be achieved.

With the above structure, when the backlight module 2 of the present invention is assembled, the limiting post 251 of the fixing unit 25 extends through the first through hole 213 on the side wall 212 of the back plate 21 along the first direction X. , and then extend into the corresponding notch 243 of the light guide plate 24 . Accordingly, the fixing unit 25 can be used to limit the plastic frame 22 , the back plate 21 and the light guide plate 24 at the same time.

The above-mentioned design of the backlight module 2 of the present invention has the following advantages:

1. The limiting post 251 of the fixing unit 25 is integrally formed with the plastic frame 22, which can reduce the tolerance problem caused by post-processing.

2. Since the limiting column 251 of the fixing unit 25 and the notch 243 of the light guide plate 24 also extend along the first direction X, when the light guide plate 24 and the fixing unit 25 are aligned and assembled, the assembler can visually Whether the notch 243 of the light guide plate 24 is aligned with the limiting column 251 for assembly, thereby reducing the risk of deformation or skewing of the limiting column 251 .

3. After the assembly of the present invention is completed, the fixing unit 25 can limit the back plate 21, the plastic frame 22, and the light guide plate 24 at the same time, which can not only limit the effect of the light guide plate 24 in the first direction X, but also limit the position of the light guide plate 24 in the first direction X. The fixing unit 25 directly presses against the side edge 242 of the light guide plate 24 , which is more conducive to the stability of the overall structure and improves the yield of the finished product.

After the backlight module 2 of the present invention is assembled, it forms the type shown in FIG. 6 , and after adding a display panel 3 , it becomes the display device shown in FIG. 7 .

Referring to FIG. 8 , it is a second preferred embodiment of the backlight module 4 of the present invention, which also includes a backplane 41 , a plastic frame 42 disposed around the periphery of the backplane 41 , a light-emitting unit 43 , a light guide plate 44 , and Two fixed units 45 (only one is shown due to viewing angle). The back plate 41 includes a plate body 411 and a side wall 412 connected to the periphery of the plate body 411 . Two first through holes 413 are formed on the side wall 412 (only one is shown due to the viewing angle). The plastic frame 42 includes a surrounding wall 422 surrounding the side wall 412 , and two second through holes 423 corresponding to the first through holes 413 are formed on the surrounding wall 422 (only one is shown due to the viewing angle).

In this embodiment, the fixing unit 45 directly passes through the first through hole 413 and the second through hole 423 to abut against and limit the light guide plate 44 . In actual implementation, the first through hole 413 of the back plate 41 or the second through hole 423 of the plastic frame 42 may also have internal threads, so that the fixing unit 45 can be more stably connected to the The plastic frame 42 is combined with the back plate 41 to limit the light guide plate 44 at the same time.

Referring to FIG. 9 , it is a third preferred embodiment of the backlight module 5 of the present invention, which also includes a back plate 51 , a plastic frame 52 disposed around the periphery of the back plate 51 , a light-emitting unit 53 , a light guide plate 54 , and Two fixed units 55 (only one is shown due to viewing angle). The back plate 51 includes a plate body 511 , a side wall 512 connected to the periphery of the plate body 511 , and two sleeves 513 integrally extending from the side wall 512 (only one is shown due to the viewing angle), each sleeve 513 A first through hole 514 is surrounded and has an inner thread. The plastic frame 52 includes a surrounding wall 522 , and two second through holes 523 corresponding to the two sleeves 513 are formed on the surrounding wall 522 (only one is shown due to the viewing angle). The barrels 513 are respectively protruded into the two second through holes 523 . Through the structure and arrangement of the sleeve 513, the combination stability of the back plate 51 and the plastic frame 52 can be enhanced, and the two fixing units 55 are screwed into the two sleeves 513 respectively, which can also increase the two The stability of the combination of the fixing unit 55 and the back plate 51 .

To sum up, in the backlight module of the present invention, the fixing unit simultaneously restrains the plastic frame, the backplane, and the light guide plate along the first direction, which not only improves the convenience of alignment, but also effectively avoids deviation during assembly. It can optimize the assembly procedure, improve the production yield, and can also increase the limit stability of the light guide plate.

However, the above are only preferred embodiments of the present invention, and should not limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention, All still fall within the scope of the patent of the present invention.

2: Backlight module 21: Backplane 211: Board body 212: Sidewall 213: First Piercing 22: plastic frame 222: Surrounding Walls 23: Lighting unit 24: light guide plate 241: light incident surface 242: Side 243: Gap 25: Fixed unit 251: Limit post 252: Reinforcement 3: Display panel 4: Backlight module 41: Backplane 411: Board body 412: Sidewall 413: First Piercing 42: plastic frame 422: Surrounding Walls 423: Second Piercing 43: Lighting unit 44: light guide plate 45: Fixed unit 5: Backlight module 51: Backplane 511: Board body 512: Sidewall 513: Sleeve 514: First Perforation 52: plastic frame 522: Surrounding Walls 523: Second Perforation 53: Lighting unit 54: light guide plate 55: Fixed unit

1 is a perspective view of a first preferred embodiment of a backlight module of the present invention; Fig. 2 is a top view, which is an enlargement of the right frame shown in Fig. 1, wherein a limit post is in an empty state; FIG. 3 is a top view illustrating the solid state of the limiting column formed in one piece; FIG. 4 is a top view, illustrating that the limiting column is filled with a reinforcing member to form a solid state; FIG. 5 is a top view illustrating a state in which the reinforcing member is a screw; Fig. 6 is a cross-sectional view illustrating the assembled form of the first preferred example; 7 is a cross-sectional view illustrating the first preferred embodiment plus a display panel to form a display device; FIG. 8 is a top view of the second preferred embodiment of the backlight module of the present invention; and FIG. 9 is a top view of the third preferred embodiment of the backlight module of the present invention.

2: Backlight module

21: Backplane

211: Board body

212: Sidewall

213: First Piercing

22: plastic frame

222: Surrounding Walls

23: Lighting unit

24: light guide plate

241: light incident surface

242: Side

243: Gap

25: Fixed unit

251: Limit post

Claims (12)

A backlight module, comprising: a back plate, including a plate body and a side wall connected to the periphery of the plate body; a plastic frame, the ring is arranged on the back panel; a light-emitting unit disposed on one side of the backplane and extending along a first direction; a light guide plate placed on the body of the back plate, the light guide plate has a light incident surface for receiving light from the light-emitting unit; and At least one fixing unit simultaneously restrains the plastic frame, the backplane, and the light guide plate along the first direction. The backlight module of claim 1, wherein at least one first through hole is formed on the side wall of the back plate, the plastic frame includes a surrounding wall surrounding the periphery of the side wall of the back plate, and the fixing unit is made of The surrounding wall of the plastic frame integrally extends through the first through hole and abuts against the light guide plate. The backlight module of claim 2, wherein the fixing unit includes a limit post. The backlight module of claim 3, wherein the fixing unit further includes a reinforcing member disposed in the limiting column. The backlight module of claim 4, wherein an end of the reinforcing member protrudes from the limiting post and abuts against the light guide plate. The backlight module of claim 1, wherein at least one first through hole is formed on the side wall of the back plate, the plastic frame includes a surrounding wall surrounding the periphery of the side wall of the back plate, and the surrounding wall is formed on the surrounding wall. There is at least one second through hole corresponding to the first through hole, and the fixing unit passes through the first through hole and the second through hole abuts against and limits the light guide plate. The backlight module of claim 6, wherein the second through hole of the plastic frame is formed with an inner thread, and the fixing unit is screwed to the second through hole and passes through the first through hole to limit the light guide plate. The backlight module of claim 6, wherein the first through hole of the back plate is formed with an internal thread, and the fixing unit passes through the second through hole and is screwed to the first through hole to limit the light guide plate. The backlight module of claim 1, wherein the back plate further comprises at least one sleeve integrally extending from the side wall, the sleeve surrounds a first through hole and has an inner thread, and the plastic frame includes a sleeve surrounding the side wall. At least one second through hole is formed on the surrounding wall of the peripheral edge of the side wall of the back plate, the sleeve of the back plate extends into the second through hole, and the fixing unit is screwed with the sleeve. The backlight module of claim 1, wherein at least one notch is formed on a side of the light guide plate facing the fixing unit, and an end of the at least one fixing unit is pressed against the notch. The backlight module of claim 10, wherein the light guide plate has two opposite sides, the two sides respectively have a notch extending along the first direction, the number of the fixing units is two, and the two fixed The ends of the units are respectively abutted in the two notches. A display device, comprising the backlight module according to any one of claims 1 to 11, and a display panel disposed on the backlight module.

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