CN219574548U - Backlight module - Google Patents

Abstract

The utility model provides a backlight module which comprises a first light guide plate, a first light source, a second light guide plate, a second light source and a back plate. The backboard comprises a bottom board and a first side frame. The first light guide plate and the first light source are arranged on one side of the first surface of the bottom plate. The second light guide plate and the second light source are arranged on one side of the second surface of the bottom plate. The first side frame is arranged on the light incident side of each of the first light guide plate and the second light guide plate and comprises a first frame part and a second frame part. The first frame part integrally and bending extends from the bottom plate and covers the first light source in the first direction. The second frame part is connected with the first frame part and covers the second light source in the second direction. The first direction is antiparallel to the second direction. The backlight module provided by the utility model has lighter and thinner overall thickness and lower production cost.

Description

Backlight module

Technical Field

The present utility model relates to a light source module, and more particularly to a backlight module.

Background

The demand for dual-sided displays is increasing. In the existing dual-sided display, a backlight module mostly uses a single light guide plate to perform dual-sided light emission. However, as the resolution of the display panel increases, the light transmittance of the display panel decreases. Therefore, the design of dual-side light emission of the existing single light guide plate cannot meet the illumination requirement of the high-quality display. If two sets of backlight modules are used for back-to-back lamination, the overall thickness and production cost of the dual-sided display are increased.

The background section is only for the purpose of aiding in the understanding of the present utility model and thus the disclosure of the background section may include some techniques that do not form part of the knowledge of one of ordinary skill in the art. The disclosure of the "background" section is not intended to represent the subject matter or problem underlying one or more embodiments of the present utility model, as it would be known or appreciated by one of ordinary skill in the art prior to the application of the present utility model.

Disclosure of Invention

The utility model provides a backlight module, which has lighter and thinner overall thickness and lower production cost.

Other objects and advantages of the present utility model will be further appreciated from the technical features disclosed in the present utility model.

In order to achieve one or a part or all of the above or other objects, an embodiment of the utility model provides a backlight module. The backlight module comprises a first light guide plate, a first light source, a second light guide plate, a second light source and a back plate. The first light source is arranged on the light incident side of the first light guide plate. The second light source is arranged on the light incident side of the second light guide plate. The backboard comprises a bottom board and a first side frame. The bottom plate is provided with a first surface and a second surface which are opposite. The first light guide plate and the first light source are arranged on one side of the first surface of the bottom plate. The second light guide plate and the second light source are arranged on one side of the second surface of the bottom plate. The first side frame is arranged on the light incident side of each of the first light guide plate and the second light guide plate and comprises a first frame part and a second frame part. The first frame part integrally and bending extends from the bottom plate and covers the first light source in the first direction. The first direction is parallel to a normal direction of the first surface. The second frame portion is connected to the first frame portion and covers the second light source in a second direction. The second direction is antiparallel to the first direction.

In view of the above, in the backlight module according to an embodiment of the utility model, the side frame of the back plate may define two accommodating spaces for accommodating the two backlights. Because the two backlight sources share the same backboard, the whole thickness and the production cost of the backlight module can be effectively reduced.

In order to make the above features and advantages of the present utility model more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1A and 1B are schematic front and rear views of a back plate according to a first embodiment of the present utility model.

Fig. 2 is a fully expanded view of the back plate of fig. 1A and 1B.

Fig. 3A and 3B are schematic cross-sectional views of a backlight module according to a first embodiment of the utility model.

Fig. 4A and 4B are perspective views of the second side frame and the third side frame of fig. 1A at different angles.

Fig. 5A to 5C are perspective views of the first side frame and the third side frame of fig. 1A at different viewing angles.

Fig. 6 is a schematic cross-sectional view of a backlight module according to a second embodiment of the present utility model.

Fig. 7A and 7B are schematic perspective views of the back plate of fig. 6 at different viewing angles.

Fig. 8 is a schematic cross-sectional view of a backlight module according to a third embodiment of the present utility model.

Fig. 9 is a fully expanded view of a back plate according to a fourth embodiment of the present utility model.

Fig. 10A and 10B are schematic cross-sectional views of a backlight module according to a fourth embodiment of the utility model.

Reference numerals illustrate:

10. 10A, 10B, 10C: backlight module

100. 100A, 100B, 100C: backboard

110: bottom plate

110s 1: a first surface

110s2: a second surface

130: connecting piece

151. 152: side glue frame

210: first light guide plate

210bs, 220bs: bottom surface

210es, 220es: light-emitting surface

210is, 220is: light incident surface

220: second light guide plate

251: first light source

252: second light source

310: first optical film

320: second optical film

350: reflection sheet

AS 1: first accommodation space

AS2: second accommodation space

CP: bearing part

D1: first direction

D2: second direction

PF1: first rubber frame

PF2: second rubber frame

PF3: third rubber frame

SF1, SF1-A, SF1-B: first side frame

SF1a, SF1a-A, SF a-B: a first frame part

SF1B, SF1B-A, SF1B-B: a second frame part

SF2, SF2-C: second side frame

SF3, SF3-C: third side frame

SF4, SF4-C: fourth side frame

SH1, SH1-A, SH1-B: first cover part

SH2, SH2-A, SH2-B: second cover part

t0: thickness of the base plate

t1, t1": first thickness of

t2: second thickness of

A-A ', B-B': and (5) cutting.

Detailed Description

The foregoing and other features, aspects and advantages of the present utility model will become more apparent from the following detailed description of the preferred embodiment, which proceeds with reference to the accompanying drawings. The directional terms mentioned in the following embodiments are, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, the directional terminology is used for purposes of illustration and is not intended to be limiting of the utility model.

Fig. 1A and 1B are schematic front and rear views of a back plate according to a first embodiment of the present utility model. Fig. 2 is a fully expanded view of the back plate of fig. 1A and 1B. Fig. 3A and 3B are schematic cross-sectional views of a backlight module according to a first embodiment of the utility model. Fig. 4A and 4B are perspective views of the second side frame and the third side frame of fig. 1A at different angles. Fig. 5A to 5C are perspective views of the first side frame and the third side frame of fig. 1A at different viewing angles. Fig. 3A corresponds to the section line A-A' of fig. 1A. Fig. 3B corresponds to section line B-B' of fig. 1A.

Referring to fig. 1A to 3B, the backlight module 10 includes a back plate 100, a first light guide plate 210, a first light source 251, a second light guide plate 220 and a second light source 252. The back plate 100 includes a bottom plate 110, a first side frame SF1, a second side frame SF2, a third side frame SF3, and a fourth side frame SF4. The base plate 110 has a first surface 110s1 and a second surface 110s2 facing away from each other, and the first surface 110s1 is parallel to the second surface 110s2, for example. The first light guide plate 210 and the first light source 251 are disposed at one side of the first surface 110s1 of the bottom plate 110. The second light guide plate 220 and the second light source 252 are disposed at one side of the second surface 110s2 of the bottom plate 110.

In the present embodiment, the first side frame SF1 and the second side frame SF2 may be disposed at opposite sides of the bottom plate 110 along the vertical direction of fig. 1A, and the third side frame SF3 and the fourth side frame SF4 may be disposed at opposite sides of the bottom plate 110 along the horizontal direction of fig. 1A. Each of these side frames extends from one side of the first surface 110s1 of the base plate 110 to the other side of the second surface 110s2. More specifically, the first surface 110s1, the first side frame SF1, the second side frame SF2, the third side frame SF3, and the fourth side frame SF4 of the bottom plate 110 define a first accommodating space AS1 of the back plate 100. The second surface 110s2, the first side frame SF1, the second side frame SF2, the third side frame SF3, and the fourth side frame SF4 of the bottom plate 110 define a second accommodating space AS2 of the back plate 100.

The first light guide plate 210 and the first light source 251 can be disposed in the first accommodating space AS1 of the back plate 100. The second light guide plate 220 and the second light source 252 can be disposed in the second accommodating space AS2 of the back plate 100. In the present embodiment, the first light guide plate 210 has a light incident surface 210is, a light emergent surface 210es and a bottom surface 210bs connected to the light incident surface 210is and facing away from each other, and the first light source 251 is disposed on one side of the light incident surface 210is of the first light guide plate 210 (i.e. the light incident side of the first light guide plate 210). Similarly, the second light guide plate 220 has a light incident surface 220is, a light emergent surface 220es and a bottom surface 220bs connected to the light incident surface 220is and facing away from each other, and the second light source 252 is disposed on one side of the light incident surface 220is of the second light guide plate 220 (i.e. the light incident side of the second light guide plate 220).

In the present embodiment, the bottom surface 210bs of the first light guide plate 210is opposite to the bottom surface 220bs of the second light guide plate 220, and the light emitting surface 210es of the first light guide plate 210is opposite to the light emitting surface 220es of the second light guide plate 220. That is, the light emitting direction of the first light guide plate 210is opposite to the light emitting direction of the second light guide plate 220. More specifically, the backlight module 10 of the present embodiment is, for example, a side-in light source module capable of emitting light from both sides.

On the other hand, the first light source 251 and the second light source 252 may be respectively bonded on a circuit board CB, and the circuit board CB may extend to one side of the bottom surface of the light guide plate, wherein the circuit board CB is, for example, a flexible printed circuit board (flexible printed circuit, FPC), but is not limited thereto. The first optical film 310 may be further disposed on one side of the light emitting surface 210es of the first light guide plate 210, and the reflective sheet 350 may be further disposed on one side of the bottom surface 210 bs. Similarly, a second optical film 320 may be further disposed on one side of the light emitting surface 220es of the second light guide plate 220, and a reflective sheet 350 may be further disposed on one side of the bottom surface 220bs thereof. Each of the first optical film 310 and the second optical film 320 includes, for example, a diffusion sheet, an optical brightness enhancement film, a prism sheet, or a combination thereof.

It is particularly noted that the first side frame SF1, the second side frame SF2, the third side frame SF3, and the fourth side frame SF4 are each integrally and bending-extended from the bottom plate 110. More specifically, in the present embodiment, the back plate 100 is formed by punching a single plate a plurality of times. Fig. 2 is a fully expanded view of the back plate 100, that is, fig. 2 is a state before the back plate 100 is press-molded. In fig. 2, the bottom plate 110 is rectangular, for example, the wing plates extending from the lower side of the bottom plate 110 may be punched and bent along the bending line BL (each broken line shown in fig. 2) to form the first side frame SF1 of the back plate 100, the wing plates extending from the upper side of the bottom plate 110 may be punched and bent along the bending line BL to form the second side frame SF2 of the back plate 100, the wing plates extending from the right side of the bottom plate 110 may be punched and bent along the bending line BL to form the third side frame SF3 of the back plate 100, and the wing plates extending from the left side of the bottom plate 110 may be punched and bent along the bending line BL to form the fourth side frame SF4 of the back plate 100.

By the above-mentioned integrated design and stamping method, two backlights can share the same back plate 100. Therefore, the overall thickness and the production cost of the backlight module 10 can be effectively reduced.

Further, referring to fig. 3A and fig. 5A to fig. 5C, the first side frame SF1 (shown in the lower side of fig. 3A) includes a first frame portion SF1a and a second frame portion SF1b, and the first side frame SF1 is disposed at the light incident side of each of the first light guide plate 210 and the second light guide plate 220. In the present embodiment, the first frame portion SF1a integrally extends from the bottom plate 110 and is formed by two 90 degree bends and one 180 degree bend, and the second frame portion SF1b integrally extends from the first frame portion SF1a and is formed by two 90 degree bends, but is not limited thereto.

It is particularly noted that the first frame portion SF1a covers the first light source 251 and a portion of the first light guide plate 210 in the first direction D1, and the second frame portion SF1b covers the second light source 252 and a portion of the second light guide plate 220 in the second direction D2, wherein the first direction D1 is parallel to a normal direction of the first surface 110s1 of the bottom plate 110, and the second direction D2 is parallel to a normal direction of the second surface 110s2 of the bottom plate 110, i.e. the first direction D1 is antiparallel to the second direction D2. In the present embodiment, the first side frame SF1 does not cover the first optical film 310 and the second optical film 320 in the first direction D1 (or the second direction D2), but is not limited thereto.

In detail, the first frame portion SF1a has a first cover portion SH1 covering the first light source 251 and a portion of the first light guide plate 210, and the second frame portion SF1b has a second cover portion SH2 covering the second light source 252 and a portion of the second light guide plate 220. Since the first frame portion SF1a and the second frame portion SF1b of the present embodiment are punched through the same wing (as shown in fig. 2), the first thickness t1 of the first cover portion SH1 in the first direction D1 may be greater than the second thickness t2 of the second cover portion SH2 in the second direction D2, and the first thickness t1 may be greater than the bottom thickness t0 of the bottom plate 110 in the first direction D1 (e.g. the distance between the two reflective sheets 350), and in the embodiment that does not include the reflective sheet and the lower circuit board, for example, the distance between the two light guide plates, but is not limited thereto. The thickness t0 of the base plate here is, for example, an average thickness of the base plate 110 at all points.

Specifically, the first cover portion SH1 and the second cover portion SH2 for shielding the first light source 251 and the second light source 252 may be formed on the first side frame SF1 at the same time, i.e. the two cover portions may be formed on the same side of the bottom plate 110. Therefore, the first light bar (i.e. the combination of the first light source 251 and the circuit board CB) and the second light bar (i.e. the combination of the second light source 252 and the circuit board CB) can be disposed on the same side of the back panel 100, which is helpful for reducing the width of the back panel 100 of the backlight module 10 in the vertical direction of fig. 1A, and further realizing the design of a narrow frame.

Referring to fig. 3A to 4B, on the other hand, the second side frame SF2 of the back plate 100 integrally extends from the bottom plate 110 and is formed by one 90 degree bending and one 180 degree bending. Similarly, the third side frame SF3 and the fourth side frame SF4 each integrally extend from the bottom plate 110 and are formed by one 90 degree bend and one 180 degree bend. Therefore, the second side frame SF2, the third side frame SF3 and the fourth side frame SF4 respectively define the first accommodating space AS1 and the second accommodating space AS2, which have different thicknesses.

In particular, in the present embodiment, the wing plates integrally extending from each side of the bottom plate 110 are bent toward one side of the first surface 110s1 of the bottom plate 110 before being bent to the other side of the second surface 110s2 of the bottom plate 110. However, the present utility model is not limited thereto. In other embodiments, not shown, the first bending direction of each side frame of the back plate may be different, for example: the first side frame may be bent toward one side of the first surface 110s1 of the bottom plate 110, and the second side frame may be bent toward one side of the second surface 110s2 of the bottom plate 110, but is not limited thereto.

Referring to fig. 3A and 3B, the backlight module 10 may further include a side frame 151 and a side frame 152, wherein the side frame 151 is disposed on one side of the first surface 110s1 of the bottom plate 110, and the side frame 152 is disposed on one side of the second surface 110s2 of the bottom plate 110. In detail, each of the side frames 151 and 152 may include a carrier CP, a first frame PF1, a second frame PF2, and a third frame PF3. The first adhesive frame PF1 of the side adhesive frame 151 is disposed between the second side frame SF2 and the first light guide plate 210. The second adhesive frame PF2 of the side adhesive frame 151 is disposed between the third side frame SF3 and the first light guide plate 210. The third adhesive frame PF3 of the side adhesive frame 151 is disposed between the fourth side frame SF4 and the first light guide plate 210. The carrying portion CP of the side frame 151 is connected to the first, second and third frames PF1, PF2, PF3, and covers the second, third and fourth side frames SF2, SF3, SF4 of the back plate 100 in the first direction D1, in other words, the carrying portion CP has an inverted-u-shaped appearance.

Similarly, the first adhesive frame PF1 of the side adhesive frame 152 is disposed between the second side frame SF2 and the second light guide plate 220. The second adhesive frame PF2 of the side adhesive frame 152 is disposed between the third side frame SF3 and the second light guide plate 220. The third adhesive frame PF3 of the side adhesive frame 152 is disposed between the fourth side frame SF4 and the second light guide plate 220. The carrying portion CP of the side frame 152 is connected to the first frame PF1, the second frame PF2, and the third frame PF3, and covers the second side frame SF2, the third side frame SF3, and the fourth side frame SF4 of the back panel 100 in the second direction D2.

For example, the carrying portion CP of the side frame 151 and the carrying portion CP of the side frame 152 are used for respectively receiving two liquid crystal display panels (not shown) and forming a dual-sided display.

Other embodiments will be listed below to describe the present disclosure in detail, wherein like components will be denoted by like reference numerals, and descriptions of the same technical content will be omitted, and reference is made to the foregoing embodiments for parts, which will not be repeated below.

Fig. 6 is a schematic cross-sectional view of a backlight module according to a second embodiment of the present utility model. Fig. 7A and 7B are schematic perspective views of the back plate of fig. 6 at different viewing angles. For clarity of presentation of the first frame portion SF1a-A, FIGS. 7A and 7B omit illustration of the second frame portion SF1B-A of FIG. 6. Referring to fig. 6, 7A and 7B, the backlight module 10A of the present embodiment is different from the backlight module 10 of fig. 3A only in that: the first side frame of the backboard has different configurations and different forming methods.

In the present embodiment, the first frame portion SF1A-A of the first side frame SF1-a of the back plate 100A integrally extends from the bottom plate 110 and is bent twice by 90 degrees. It is particularly noted that the second frame portion SF1b-a of the first side frame SF1-a of the present embodiment does not integrally extend from the first frame portion SF1A-A, but is fixed to the lower side region of the first frame portion SF1A-A by welding or gluing after being separately manufactured. That is, the second frame portion SF1b-A may be fixedly connected to the first frame portion SF1a-A via a solder or a glue (such as the connector 130 shown in FIG. 6) disposed on the lower side of the first frame portion SF1 a-A.

Through the design, the bending times of the backboard 100A can be reduced, and the problem that the backboard 100A is difficult to mold is further solved.

On the other hand, in the present embodiment, the formation of the first frame portion SF1A-A of the first side frame SF1-a does not include one 180-degree bend as shown in fig. 3A. Therefore, the first thickness t1 of the first cover portion SH1-A of the first frame portion SF1a-A in the first direction D1, the bottom plate thickness t0 of the bottom plate 110 in the first direction D1, and the second thickness t2 of the second cover portion SH2-A of the second frame portion SF1b-A in the second direction D2 are substantially the same.

Fig. 8 is a schematic cross-sectional view of a backlight module according to a third embodiment of the present utility model. Referring to fig. 8, the difference between the backlight module 10B of the present embodiment and the backlight module 10 of fig. 3A is that: the first side frame of the back plate and the optical film are different in configuration relation. Specifically, in the present embodiment, the first cover portion SH1-B of the first frame portion SF1 a-B of the first side frame SF1-B of the back plate 100B also covers a portion of the first optical film 310, and the second cover portion SH2-B of the second frame portion SF1B-B of the first side frame SF1-B also covers a portion of the second optical film 320. Specifically, a portion of the first optical film 310 is located in the first accommodating space, and a portion of the second optical film 320 is located in the second accommodating space.

Fig. 9 is a fully expanded view of a back plate according to a fourth embodiment of the present utility model. Fig. 10A and 10B are schematic cross-sectional views of a backlight module according to a fourth embodiment of the utility model. Referring to fig. 9, 10A and 10B, the main differences between the backlight module 10C of the present embodiment and the backlight module 10 of fig. 3A are as follows: the configuration of part of the side frames of the backboard is different.

In the present embodiment, the second side frame SF2-C, the third side frame SF3-C and the fourth side frame SF4-C of the back plate 100C are respectively integrally extended from the bottom plate 110 and are formed by one 90-degree bending and two 180-degree bending. Therefore, the side frames respectively define the first accommodating space AS1 and the second accommodating space, and the thicknesses of the two parts are substantially equal.

In summary, in the backlight module according to an embodiment of the utility model, the side frame of the back plate may define two accommodating spaces for accommodating the two backlights. Because the two backlight sources share the same backboard, the whole thickness and the production cost of the backlight module can be effectively reduced.

However, the foregoing is only illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the scope of the utility model, which is defined by the appended claims and their equivalents. Not all of the objects, advantages, or features of the present disclosure are required to be achieved by any one embodiment or claim of the present disclosure. Furthermore, the abstract and title are provided for the purpose of facilitating patent document retrieval only, and are not intended to limit the scope of the claims. Furthermore, references to "first," "second," etc. in this specification or in the claims are only intended to name an element or distinguish between different embodiments or ranges, and are not intended to limit the upper or lower limit on the number of elements.

Claims (10)

1. The utility model provides a backlight module which characterized in that, backlight module includes first light guide plate, first light source, second light guide plate, second light source and backplate, wherein:

the first light source is arranged on the light incident side of the first light guide plate;

the second light source is arranged on the light incident side of the second light guide plate; and

the backplate includes bottom plate and first side frame, wherein:

the bottom plate is provided with a first surface and a second surface which are opposite, the first light guide plate and the first light source are arranged on one side of the first surface of the bottom plate, and the second light guide plate and the second light source are arranged on one side of the second surface of the bottom plate; and

the first side frame is arranged on the light incident side of each of the first light guide plate and the second light guide plate, and comprises a first frame part and a second frame part, wherein:

the first frame part integrally and bending extends from the bottom plate, and covers the first light source in a first direction, and the first direction is parallel to a normal direction of the first surface; and

the second frame portion is connected to the first frame portion and covers the second light source in a second direction, wherein the second direction is antiparallel to the first direction.

2. The backlight module according to claim 1, wherein the first frame portion extending from the bottom plate is formed by two 90-degree bends, and the second frame portion is fixed to the first frame portion by welding or gluing.

3. The backlight module according to claim 1, wherein the second frame portion integrally and bending extends from the first frame portion.

4. A backlight module according to claim 3, wherein the first frame portion extending from the bottom plate is formed by two 90 degree bends and one 180 degree bend, and the second frame portion extending from the first frame portion is formed by two 90 degree bends.

5. A backlight module according to claim 3, wherein the first cover portion of the first frame portion has a first thickness in the first direction and the second cover portion of the second frame portion has a second thickness in the second direction, the chassis has a chassis thickness in the first direction, and the first thickness is greater than the second thickness and the chassis thickness.

6. The backlight module of claim 1, further comprising a second side frame, wherein:

the second side frame integrally and flexibly extends from the bottom plate, a first accommodating space is defined by the first frame part of the first side frame, the second side frame and the first surface of the bottom plate, a second accommodating space is defined by the second frame part of the first side frame, the second side frame and the second surface of the bottom plate, the first light guide plate and the first light source are arranged in the first accommodating space, and the second light guide plate and the second light source are arranged in the second accommodating space.

7. The backlight module according to claim 6, wherein the second side frame integrally extending from the bottom plate is formed by one 90 degree bend and one 180 degree bend.

8. The backlight module of claim 6, further comprising a third side frame and a fourth side frame, wherein:

the third side frame and the fourth side frame extend from two opposite sides of the bottom plate in an integral and bending mode respectively, the first frame part of the first side frame, the second side frame, the third side frame, the fourth side frame and the first surface of the bottom plate define a first accommodating space, and the second frame part of the first side frame, the second side frame, the third side frame, the fourth side frame and the second surface of the bottom plate define a second accommodating space.

9. The backlight module of claim 8, further comprising a side glue frame, wherein the side glue frame comprises a bearing portion, a first glue frame, a second glue frame and a third glue frame, wherein the first glue frame is disposed between the second side frame and the first light guide plate, the second glue frame is disposed between the third side frame and the first light guide plate, the third glue frame is disposed between the fourth side frame and the first light guide plate, and the bearing portion connects the first glue frame, the second glue frame and the third glue frame, and covers the second side frame, the third side frame and the fourth side frame in the first direction.

10. The backlight module of claim 1, further comprising a first optical film and a second optical film, wherein:

the first optical film is arranged on one side of the first light guide plate, which is away from the bottom plate, and the first frame part also covers part of the first optical film; and

the second optical film is arranged on one side of the second light guide plate, which is away from the bottom plate, and the second frame part also covers part of the second optical film.