CN112987402A

CN112987402A - Backlight module and display device

Info

Publication number: CN112987402A
Application number: CN202110234615.0A
Authority: CN
Inventors: 郭家仕
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2021-06-18

Abstract

The invention discloses a backlight module and a display device, and relates to the technical field of display. The backlight module includes: a back plate comprising a bottom plate; the backlight module comprises a light guide plate and an optical film layer, wherein the light guide plate and the optical film layer are arranged on one side of a bottom plate in a stacking manner along the light emergent direction of the backlight module, and the optical film layer is positioned on one side of the light guide plate, which is far away from the bottom plate; the rubber frame at least partially surrounds the back plate, the light guide plate and the optical film layer; comprises a side wall, a first convex part and a second convex part; the first bulge part and the second bulge part are both positioned on one side of the side wall facing the optical film layer; along the light-emitting direction of the backlight module, the first protruding portion is located between the second protruding portion and the bottom plate, the first protruding portion, the second protruding portion and the side wall surround to form a first notch, and at least part of the orthographic projection of the optical film layer to the side wall is located in the first notch; so that optics rete can extend to first breach inside when the inflation, under the condition that does not increase display product frame size, increase the inflation/shrink space of optics rete, be favorable to improving backlight unit's life.

Description

Backlight module and display device

Technical Field

The invention relates to the technical field of display, in particular to a backlight module and a display device.

Background

Fig. 1 is a schematic cross-sectional view of a backlight module in the prior art, which mainly illustrates the design of the narrow frame side of the current narrow frame product for vehicle mounting; the bearing surface of the rubber frame 01 for the lower iron shell 02 is higher than the topmost film material (film material P1), and the side wall of the lower iron shell 02 is directly propped against the bearing surface to serve as a vertical support for the rubber frame by the lower iron shell 02. Under such a design, a gap between the edge of the film material and the inner side surface of the side wall of the lower iron shell 02 is an expansion space Q1 of the film material, and a gap between the edge of the film material and the edge of a rubber frame on the bearing surface of an LCD (Liquid Crystal Display) 03 is a contraction space Q2 of the film material.

Because the market is to the demand of narrow frame, along with the reduction of product frame size, the total space in membrane material expansion space + membrane material shrink space also reduces gradually, can appear the not enough problem in membrane material expansion space or membrane material shrink space. Therefore, it is highly desirable to provide a backlight module capable of providing sufficient expansion space and contraction space for the film material under the condition of ensuring a narrow frame of the display product.

Disclosure of Invention

In view of this, the present invention provides a backlight module and a display device, so as to solve the problem of insufficient expansion space and shrinkage space of a narrow-frame display product film.

In a first aspect, the present application provides a backlight module, comprising:

a back plate comprising a bottom plate;

the backlight module comprises a light guide plate and an optical film layer, wherein the light guide plate and the optical film layer are arranged on one side of the bottom plate in a stacking manner along the light emergent direction of the backlight module, and the optical film layer is positioned on one side of the light guide plate, which is far away from the bottom plate;

a glue frame at least partially surrounding the back plate, the light guide plate and the optical film layer; comprises a side wall, a first convex part and a second convex part;

wherein the first raised part and the second raised part are both positioned on one side of the side wall facing the optical film layer; follow backlight unit's light-emitting direction, first bellying is located the second bellying with between the bottom plate, first bellying, the second bellying with the lateral wall is around forming first breach, the optics rete to the orthographic projection of lateral wall is at least partly located in the first breach.

In a second aspect, the present application provides a display device, which includes the backlight module;

the display device further comprises a display panel, and the display panel is located on the light emitting surface side of the backlight module.

Compared with the prior art, the backlight module and the display device provided by the invention at least realize the following beneficial effects:

the application provides a backlight module and a display device, wherein a first bulge is additionally arranged on one side, close to an optical film layer, of a rubber frame in the backlight module, and a back plate is arranged to be in contact with the surface of one side, close to a bottom plate, of the first bulge; glue the lateral wall of frame, the first bellying that second bellying and add and surround and form first breach, set up the optical film layer and lie in first breach to the orthographic projection of gluing the frame lateral wall at least part to make the optical film layer can extend to first breach inside when the inflation, avoid with the contact of backplate side, increased the inflation space of optical film layer, and the optical film layer does not overlap with backplate side to the orthographic projection of gluing the frame lateral wall, has also increased the shrink space of optical film layer. Therefore, under the condition that the size of a frame of a display product is not increased, the expansion space and the contraction space of the optical film layer are increased, the service life of the optical film layer is favorably ensured, the damage caused by contact extrusion of the optical film layer with the rubber frame and the back plate is avoided, and the display effect of the corresponding display device is favorably improved.

Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic cross-sectional view of a backlight module in the prior art;

FIG. 2 is a schematic cross-sectional view of the backlight module of FIG. 1 after being heated;

FIG. 3 is a schematic cross-sectional view illustrating the backlight module of FIG. 1 being cooled and then heated;

fig. 4 is a schematic partial cross-sectional view of a backlight module according to an embodiment of the present disclosure;

fig. 5 is a schematic partial cross-sectional view illustrating a backlight module according to an embodiment of the disclosure;

fig. 6 is a schematic partial cross-sectional view illustrating a backlight module according to an embodiment of the disclosure;

fig. 7 is a schematic partial cross-sectional view illustrating a backlight module according to an embodiment of the disclosure;

FIG. 8 is another schematic illustration of FIG. 7 provided in accordance with an embodiment of the present application;

fig. 9 is a schematic partial cross-sectional view illustrating a backlight module according to an embodiment of the disclosure;

fig. 10 is a schematic partial cross-sectional view illustrating a backlight module according to an embodiment of the disclosure;

fig. 11 is a schematic partial cross-sectional view illustrating a backlight module according to an embodiment of the disclosure;

FIG. 12 is a schematic view of area A of FIG. 11 according to an embodiment of the present disclosure;

FIG. 13 is another schematic view of area A of FIG. 11 according to an embodiment of the present disclosure;

fig. 14 is a schematic view of a rubber frame according to an embodiment of the present disclosure;

fig. 15 is another schematic view of a rubber frame according to an embodiment of the present disclosure;

fig. 16 is a schematic view of a display device according to an embodiment of the present application;

fig. 17 is a BB' cross-sectional view of the display device according to the embodiment of the present application.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

FIG. 2 is a schematic cross-sectional view of the backlight module shown in FIG. 1 after being heated, and FIG. 3 is a schematic cross-sectional view of the backlight module shown in FIG. 1 after being cooled and then being heated; in the prior art, due to the market demand for narrow-frame display products, with the reduction of the frame size of the products, the total space of the film expansion space and the film contraction space is gradually reduced, so that the problem of insufficient film expansion space or film contraction space can occur, and when TST (Thermal Shock Test, condition: 40 ℃ -85 ℃) tests are carried out on the products, the film P1 can expand with heat and contract with cold; referring to fig. 1, the expansion of the film at high temperature causes the edge of the film P1 to move toward the side wall of the lower iron shell 02, and the contraction of the film at low temperature causes the edge of the film P1 to move away from the side wall of the lower iron shell 02.

If the expansion space of the membrane material is insufficient, the membrane material P1 will directly push against the side wall of the lower iron shell 02 when expanding at high temperature, so that the membrane material P1 cannot freely expand, and the corrugation defect of the membrane material P1 is generated, as shown in FIG. 2 below.

If the shrinkage space of the film P1 is insufficient, the edge of the film P1 will move to the inner side of the plastic frame 01 opposite to the LCD carrying surface when the film shrinks at low temperature, and when the film is recycled to a high temperature condition, the film P1 starts to expand, and the edge of the film P1 may push against the edge of the plastic frame 01 opposite to the LCD carrying surface, so that the film P1 cannot expand freely, and the waviness of the film P1 is poor, as shown in fig. 3.

If the problems need to be improved, the expansion and contraction space of the film needs to be increased, but under the current structure, the size of the frame needs to be increased to increase the space, so that the size of the frame cannot meet the requirements of customers.

Fig. 4 is a schematic partial cross-sectional view of a backlight module according to an embodiment of the present application, and referring to fig. 1, the present application provides a backlight module 100, including:

a back panel 10 including a bottom panel 11;

the light guide plate 30 and the optical film layer S1 are stacked on one side of the bottom plate 11 along the light emitting direction of the backlight module 100, wherein the optical film layer S1 is located on one side of the light guide plate 30 away from the bottom plate 11;

a glue frame 20 at least partially surrounding the back plate 10, the light guide plate 30 and the optical film layer S1; comprises a side wall 23, a first convex part 21 and a second convex part 22;

wherein, the first protruding portion 21 and the second protruding portion 22 are both located on the side of the side wall 23 facing the optical film layer S1; along the light-emitting direction of the backlight module 100, the first protrusion 21 is located between the second protrusion 22 and the bottom plate 11, the first notch K1 is formed by the first protrusion 21, the second protrusion 22 and the side wall 23, and the orthographic projection of the optical film layer S1 to the side wall 23 is at least partially located in the first notch K1.

Specifically, the present application provides a backlight module 100, where the backlight module 100 includes a back plate 10, a light guide plate 30, an optical film layer S1, and a rubber frame 20; the back plate 10 at least includes a bottom plate 11, and the bottom plate 11 is used to protect other film structures inside the backlight module 100, so as to prevent the film structures inside the backlight module 100 from being damaged by the external environment. As shown in fig. 4, the light guide plate 30 and the optical film layer S1 are sequentially disposed above the bottom plate 11, wherein the optical film layer S1 includes a plurality of sub-optical films S11/S12/S13. It should be noted that, the present application only shows the light guide plate 30 and the 3 sub-optical films S11/S12/S13, but the present application is not limited thereto, and other film layer structures may be added on the upper and lower sides of the light guide plate 30 and each sub-optical film S11/S12/S13 according to the requirement. For example, a reflective sheet or the like may be further included between the light guide plate 30 and the chassis 11.

Fig. 4 of the present application only shows a schematic diagram of the adhesive frame 20 disposed around the bottom plate 11, the light guide plate 30 and the optical film layer S1, where the adhesive frame 20 specifically includes a side wall 23, a first protrusion 21 and a second protrusion 22, where the first protrusion 21 is an additional structure compared to the prior art, and the first protrusion 21 and the second protrusion 22 are both located on a side of the side wall 23 facing the optical film layer S1; and along the light-emitting direction of the backlight module 100, the first protrusion 21 is located between the second protrusion 22 and the bottom plate 11, the first protrusion 21, the second protrusion 22 and the side wall 23 surround to form a first notch K1, and the orthographic projection of the optical film layer S1 to the side wall 23 is at least partially located in the first notch K1.

As shown in fig. 4, the orthographic projections of the optical film layers S1 to the side walls 23 may be all located in the first notch K1, and no other structure is disposed between the optical film layers S1 and the side walls 23 of the adhesive frame 20; so set up, when the whole thermal expansion that is heated of optical film S1, can expand and extend to inside first breach K1, because have sufficient extension space between optical film and the lateral wall 23 of gluey frame 20, consequently can avoid optical film S1 to expand the condition emergence of being extruded after flexible, avoided optical film S1 to take place the problem of fold deformation in the hot environment. The first notch K1 formed after the first protruding portion 21 is added is beneficial to providing the sufficient expansion space M1 for the optical film layer S1 under the condition that the backlight module 100 has a narrow frame, so that the practicability of the optical film layer S1 in different environments is guaranteed, and the service life of the backlight module 100 is prolonged.

Fig. 5 is a partial cross-sectional view of another backlight module provided in the present embodiment, as shown in fig. 5, when the extending space of the optical film S1 in the direction toward the side wall 23 of the bezel 20 is increased, the length of the optical film S1 in the extending direction thereof can be made longer appropriately; for example, the length of the optical film layer S1 is slightly greater than the length of the light guide plate 30 along the extending direction of the optical film layer S1. With such an arrangement, due to the increase of the space of the first notch K1 in the extending direction of the optical film layer S1, the expansion space M1 of the optical film layer S1 when heated can be increased, and the contraction space M2 of the optical film layer S1 at a low temperature can be increased, that is, the total space of the expansion space M1+ the contraction space M2 of the optical film layer S1 is increased, so that the expansion space M1 and the contraction space M2 of the optical film layer S1 are increased without increasing the size of the non-display area of the display product; the increase of the contraction space M2 is favorable for avoiding the situation that the optical film layer S1 contracts and the second protrusion 22 do not overlap in the orthographic projection of the bottom plate 11, and the problems of side contact and extrusion when the contracted optical film layer S1 expands again and the second protrusion 22 is far away from one side of the side wall 23 are avoided, so that the use effect of the backlight module 100 is favorably ensured. And the increase of the total space of the expansion space M1+ the contraction space M2 is beneficial to ensuring the service life of the optical film layer S1, and avoiding the disadvantages caused by the contact extrusion and the overlarge contraction range of the optical film layer S1, the rubber frame 20 and the back plate 10, thereby being beneficial to improving the functional effect of the backlight module 100.

In addition, it should be noted that, the present application does not limit that the orthographic projection of all the optical film layers S1 on the side of the light guide plate 30 away from the bottom plate 11 to the side wall 23 is located in the first notch K1, for example, when the expansion/contraction coefficients of the sub-optical films S11/S12/S13 in the optical film layer S1 are different, if the n sub-optical films (e.g., S11) on the side of the optical film layer S1 farthest from the light guide plate 30 are most susceptible to expansion and contraction due to the influence of the ambient temperature, only the n sub-optical films (e.g. S11) may be arranged such that their orthographic projections onto the side wall 23 are all located within the first notch K1, the remaining sub-optical films are only slightly expanded/contracted by the influence of the ambient temperature, and the condition that the orthographic projection of the sub-optical films (for example, S12/S13) on the bottom plate 11 has overlap with the orthographic projection of the first convex part 21 on the bottom plate 11 does not occur.

That is, in the present application, the number of the sub-optical films S11/S12/S13 located in the first notch K1 when the optical film S1 is orthographically projected onto the side wall 23 is not specifically limited, and a user can correspondingly adjust the specific position, shape and other characteristics of the first protrusion 21 according to the physical properties of each sub-optical film S11/S12/S13 in his product, as long as it is ensured that the optical film S1 is not squeezed by the expansion and other structures in the backlight module 100, and does not have an overlapping area with the orthographically projected second protrusion 22 on the bottom plate 11 due to the contraction.

Fig. 6 is another partial cross-sectional view of the backlight module according to the embodiment of the present application, please refer to fig. 4 and fig. 6, and optionally, along the light emitting direction of the backlight module 100, a side surface of the first protruding portion 21 close to the second protruding portion 22 is flush with a side surface of the light guide plate 30 away from the bottom plate 11; or, a side surface of the first protrusion 21 close to the second protrusion 22 includes a first distance from a side surface of the light guide plate 30 away from the bottom plate 11.

Specifically, along the light emitting direction of the backlight module 100, an alternative embodiment is provided in which a side surface of the first protrusion 21 close to the second protrusion 22 is flush with a side surface of the light guide plate 30 away from the bottom plate 11 (as shown in fig. 4), that is, an upper surface of the first protrusion 21 is flush with an upper surface of the light guide plate 30, and at this time, it can be ensured that all the sub-optical films S11/S12/S13 in the optical film layer S1 can extend toward the side wall 23 when they expand; and when the optical film layer S1 extends toward the side wall 23, the upper surface of the first protrusion 21 can support the extended optical film layer S1, so as to avoid the situation that the extended portion of the optical film layer S1 bends or bends toward one side of the bottom plate 11 due to the action of gravity, thereby facilitating the stability of the optical film layer S1 and prolonging the service life of the optical film layer S1.

In addition, in the light emitting direction of the backlight module 100, an alternative embodiment is provided in which a side surface of the first protrusion portion 21 close to the second protrusion portion 22 is disposed to include a first distance with a side surface of the light guide plate 30 away from the bottom plate 11, that is, a first distance is formed between an upper surface of the first protrusion portion 21 and an upper surface of the light guide plate 30. Specifically, it means that, in the light emitting direction of the backlight module 100, the distance between the upper surface of the first protrusion 21 and the plane where the bottom plate 11 is located is smaller than the distance between the upper surface of the light guide plate 30 and the plane where the bottom plate 11 is located, in other words, the upper surface of the first protrusion 21 is lower than the upper surface of the light guide plate 30.

Because a certain gap space is formed between the side of the light guide plate 30 and the optical film layer S1 and the side of the first protrusion 21 facing the light guide plate 30, when the optical film layer S1 extends out of the light guide plate 30, even if the optical film layer S1 is slightly bent toward the bottom plate 11 side, the upper surface of the first protrusion 21 is lower than the upper surface of the light guide plate 30, so that the optical film layer S1 and the first protrusion 21 can be prevented from being pressed toward the side of the light guide plate 30, and the upper surface of the first protrusion 21 can guide the expansion and extension of the optical film layer S1, thereby ensuring that the optical film layer S1 stably extends toward the side wall 23 of the rubber frame 20, preventing the optical film layer S1 from being pressed or bent due to the expansion and extension, and prolonging the service life of the optical film layer S1.

Fig. 7 is a partial cross-sectional view of another backlight module according to an embodiment of the present disclosure, please refer to fig. 7, and an alternative embodiment of the present disclosure is to provide a first distance between a side surface of the first protrusion 21 close to the second protrusion 22 and a side surface of the light guide plate 30 away from the bottom plate 11, that is, a first distance is provided between an upper surface of the first protrusion 21 and an upper surface of the light guide plate 30.

Note that, the first pitch here refers to a minimum pitch between the surface of the first protruding portion 21 on the side close to the second protruding portion 22 (specifically, the upper surface of the first protruding portion 21) and the upper surface of the light guide plate 30.

Specifically, along the light emitting direction of the backlight module 100, the distance between the end of the upper surface of the first protrusion 21 close to the side wall 23 and the plane of the bottom plate 11 is greater than the distance between the end of the upper surface of the first protrusion 21 close to the light guide plate 30 and the plane of the bottom plate 11, so as to provide the sufficient expansion space M1+ contraction space M2 for the optical film S1, thereby ensuring the normal operation effect of the backlight module 100 under various environmental temperatures. On the basis of the foregoing, the present application may provide that an end portion of the upper surface of the first protruding portion 21 on a side close to the side wall 23 is lower than or equal to the upper surface of the light guide plate 30.

In addition, an end portion of the upper surface of the first protruding portion 21 on the side close to the side wall 23 may be set higher than the upper surface of the light guide plate 30; at this time, it should be emphasized that the distance between the end of the upper surface of the first protrusion 21 close to the light guide plate 30 and the plane where the bottom plate 11 is located is still smaller than/equal to the distance between the upper surface of the light guide plate 30 and the plane where the bottom plate 11 is located; in summary, the end of the upper surface of the first protrusion 21 close to the light guide plate 30 must be limited to be not higher than the upper surface of the light guide plate 30, so as to ensure that all the optical film layers S1 can expand and extend towards the inside of the first notch K1, and avoid the situation that the optical film layers S1 are squeezed between the first protrusion 21 when expanding and extending, which is beneficial to ensuring that the optical film layers S1 all have sufficient expansion and extension space.

It should be noted that, when the end portion of the upper surface of the first protruding portion 21 close to the side wall 23 is slightly higher than the upper surface of the light guide plate 30, the distance between the end portion of the upper surface of the first protruding portion 21 close to the side wall 23 and the plane where the bottom plate 11 is located is only slightly larger than the distance between the upper surface of the light guide plate 30 and the plane where the bottom plate 11 is located, so as to avoid the problem that the first protruding portion 21 with too high height presses the expanded and extended optical film layer S1. It should be noted that, a smooth transition is formed between an end portion of the upper surface of the first protruding portion 21 on the side close to the side wall 23 and an end portion of the upper surface of the first protruding portion 21 on the side close to the light guide plate 30, and a protrusion on the side away from the bottom plate 11 is not included between the two end portions.

Referring to FIG. 6 and FIG. 7, optionally, the first distance is D, D ≧ 0.3 mm.

Specifically, when the upper surface of the first protruding portion 21 is disposed lower than the upper surface of the light guide plate 30, the present application provides an alternative manner that the specific value of the first distance D is greater than or equal to 0.3mm, that is, the upper surface of the first protruding portion 21 is closer to the plane where the bottom plate 11 is located than the upper surface of the light guide plate 30 by more than 0.3mm, so as to ensure that the optical film layer S1 has enough space when expanded and extended.

Fig. 8 is another schematic view of fig. 7 provided in the embodiment of the present application, fig. 9 is another schematic partial cross-sectional view of a backlight module provided in the embodiment of the present application, fig. 10 is another schematic partial cross-sectional view of a backlight module provided in the embodiment of the present application, where fig. 8, 9, and 10 omit some reference numerals shown in fig. 7 for clearly showing the distance H, so that, referring to fig. 8, 9, and 10 in combination with fig. 7, optionally, a side surface of the second protruding portion 22 close to the bottom plate 11 is parallel to the bottom plate 11;

along the light emitting direction of the backlight module 100, the distance between the surface of the first protrusion 21 close to the second protrusion 22 and the surface of the second protrusion 22 close to the bottom plate 11 is H, and the distance H gradually increases along the direction of the side wall 23 pointing to the side of the light guide plate 30.

Specifically, in the backlight module 100 provided by the present application, a side surface of the second protruding portion 22 close to the bottom plate 11 is set to be parallel to a plane where the bottom plate 11 is located, that is, a shortest distance between the side surface of the second protruding portion 22 close to the bottom plate 11 and the bottom plate 11 is equal everywhere.

With further reference to fig. 4, except that as shown in fig. 4, the distance between the side surface of the first protruding portion 21 close to the second protruding portion 22 and the side surface of the second protruding portion 22 close to the bottom plate 11 is H, except that H is equal everywhere; an alternative embodiment is that, in the light emitting direction of the backlight module 100, taking the distance between the side surface of the first protruding portion 21 close to the second protruding portion 22 and the side surface of the second protruding portion 22 close to the bottom plate 11 as H as an example, the distance H is set to gradually increase along the direction of the side wall 23 pointing to the side of the light guide plate 30. That is, along the direction in which the side wall 23 points to the side of the light guide plate 30, the surface of the first protruding portion 21 on the side close to the second protruding portion 22 is not parallel to the plane of the bottom plate 11; specifically, optionally, a side surface of the first protruding portion 21 close to the second protruding portion 22 is a flat surface or an arc surface, that is, a side surface of the first protruding portion 21 close to the second protruding portion 22 is an inclined surface (as shown in fig. 8) or an arc surface (including the convex arc surface shown in fig. 9 and the concave arc surface shown in fig. 10), in other words, a side surface of the first protruding portion 21 close to the second protruding portion 22 is inclined gradually toward the bottom plate 11 side along the direction from the side wall 23 toward the light guide plate 30 side.

Like this, set up the inclined plane that the side surface that is close to second boss 22 with first boss 21 to reduce gradually, when optical film S1 is heated the inflation and extends to lateral wall 23 one side, the expansion extending direction of optical film S1 can be guided to the inclined plane, and guarantee optical film S1 extends to the lateral wall 23 direction of gluey frame 20 steadily, avoids optical film S1 to be extruded because of the expansion extension, or the condition emergence of buckling, improves optical film S1' S life.

It should be noted that the inclination degree of the inclined surface of the side surface of the first protruding portion 21 close to the second protruding portion 22 shown in fig. 8 is only an example, and the arc degree of the arc surface of the side surface of the first protruding portion 21 close to the second protruding portion 22 shown in fig. 9 and 10 is also only an example, and is not used to limit the inclination degree and the arc degree of the surface, and the user can make corresponding adjustment according to actual needs.

Referring to fig. 7, optionally, the bottom plate 11 includes a first area 111 and a second area 112 surrounding the first area 111; the orthographic projection of the light guide plate 30 on the bottom plate 11 is positioned in the first area 111;

one side surface of the first projecting portion 21 close to the bottom plate 11 is in contact with the bottom plate 11, and an orthogonal projection of the one side surface of the first projecting portion 21 close to the bottom plate 11 on the bottom plate 11 at least partially overlaps the second region 112.

Specifically, in the backlight module 100 provided by the present application, the back plate 10 at least includes a bottom plate 11, and the bottom plate 11 may include a first region 111 and a second region 112, where the second region 112 exists around the first region 111; the orthographic projection of the light guide plate 30 on the bottom plate 11 is located in the first area 111, or the orthographic projection of the light guide plate 30 on the bottom plate 11 is just overlapped with the first area 111. That is, the area of the bottom plate 11 is slightly larger than the area of the light guide plate 30 in the direction perpendicular to the light emitting surface of the backlight module 100, so as to ensure that the reflective layer (not shown), the light guide plate 30, the optical film layer S1, and other structures above the bottom plate 11 have sufficient arrangement space.

In addition, one side surface of the first protrusion 21 near the bottom plate 11 contacts the bottom plate 11, so as to fix the rubber frame 20 and the back plate 10, thereby ensuring the overall stability of the backlight module 100. Specifically, the orthographic projection of the side surface of the first protruding portion 21 close to the bottom plate 11 on the bottom plate 11 at least partially overlaps with the second area 112, wherein the specific overlapping position is a side edge area far away from the first area 111 in the second area 112, that is, a gap space exists between the orthographic projection of the first protruding portion 21 on the side of the bottom plate 11 and the orthographic projection of the light guide plate 30 on the side of the bottom plate 11, and the gap space is enough to bear the expansion of a reflective sheet (not shown) and the light guide plate 30 and other film materials in a hotter environment, so as to avoid the problem of extrusion between the reflective sheet (not shown), the light guide plate 30 and other devices and the first protruding portion 21, ensure the normal operation of the backlight module 100 in various environments, and improve the service life of the backlight module 100.

Fig. 11 is a partial cross-sectional view of another backlight module according to an embodiment of the disclosure, referring to fig. 11, optionally, the bottom plate 11 includes a first region 111 and a second region 112 surrounding the first region 111; the orthographic projection of the light guide plate 30 on the bottom plate 11 is positioned in the first area 111;

the back panel 10 further includes side panels 12; the side plate 12 is positioned on one side of the bottom plate 11 close to the optical film layer S1, and an orthographic projection of the side plate 12 on the bottom plate 11 is positioned in the second area 112;

a side surface of the first projection 21 close to the bottom plate 11 is in contact with a side surface of the side plate 12 remote from the bottom plate 11.

Specifically, when the bottom plate 11 includes the first region 111 and the second region 112, and the light guide plate 30 is located in the first region 111 when the orthographic projection of the bottom plate 11 is located, the rear panel 10 may further include the side plate 12 in addition to the bottom plate 11, wherein the side plate 12 is specifically disposed on a side of the bottom plate 11 close to the optical film layer S1, the orthographic projection of the side plate 12 on the bottom plate 11 is located in the second region 112, the side plate 12 is specifically located in a side edge region of the second region 112 far from the first region 111, and a fixed connection structure or an integrated structure is provided between the bottom plate 11 and the side plate 12.

A gap space exists between the orthographic projection of the side plate 12 on one side of the bottom plate 11 and the orthographic projection of the light guide plate 30 on one side of the bottom plate 11, and the gap space is enough to bear the expansion of film materials such as a reflecting sheet (not shown) and the light guide plate 30 in a hotter environment, so that the problem of extrusion between the reflecting sheet (not shown), the light guide plate 30 and the first protruding part 21 is avoided, the normal work of the backlight module 100 in each environment is guaranteed, and the service life of the backlight module 100 is prolonged.

In addition, the surface of the first protruding portion 21 close to the bottom plate 11 contacts the surface of the side plate 12 away from the bottom plate 11, so that the back plate 10 and the rubber frame 20 are fixed in contact, which is beneficial to improving the stability of the backlight module 100.

Fig. 12 is a schematic view of a region a in fig. 11 according to an embodiment of the present disclosure, referring to fig. 11 and fig. 12, optionally, the side plate 12 includes a third protrusion 41, and the third protrusion 41 is located on a side of the side plate 12 away from the light guide plate 30;

the side wall 23 includes a first recess 42 corresponding to the third protrusion 41.

Specifically, the side plate 12 may further include at least one third protrusion 41, and in a direction perpendicular to the light emitting surface of the backlight module 100, the third protrusion 41 is located on a side of the side plate 12 away from the light guide plate 30; meanwhile, the side edge includes a plurality of first recesses 42 corresponding to the third protrusions 41, wherein the first recesses 42 and the third protrusions 41 are in a one-to-one correspondence relationship. With such an arrangement, the third protrusion 41 can be engaged with the first recess 42, so as to improve the fixing firmness between the back plate 10 and the rubber frame 20, thereby facilitating to improve the stability of the backlight module 100.

It should be noted that fig. 12 only shows one third convex portion 41 and one first concave portion 42, but the number of convex portions on the side plate 12 and concave portions on the side wall 23 is not particularly limited in the present application.

Fig. 13 is another schematic view of the area a in fig. 11 according to an embodiment of the present disclosure, referring to fig. 11-13, in addition to the above-mentioned protrusion portion disposed on the side of the side plate 12 close to the side wall 23 and the recess portion corresponding to the protrusion portion disposed on the side of the side wall 23 close to the side plate 12 in fig. 12, an alternative embodiment is further provided in which the side wall 23 includes a fourth protrusion portion 43, and the fourth protrusion portion 43 is disposed on the side of the side wall 23 close to the light guide plate 30 and on the side of the first protrusion portion 21 away from the second protrusion portion 22;

the side plate 12 includes a second recess 44 corresponding to the fourth protrusion 43.

Specifically, in a direction perpendicular to the light emitting surface of the backlight module 100, at least one fourth protrusion 43 is disposed on a side of the sidewall 23 close to the light guide plate 30, and the fourth protrusion 43 is specifically located on a side of the first protrusion 21 away from the second protrusion 22; meanwhile, a plurality of second concave portions 44 corresponding to the fourth convex portions 43 one to one are disposed on one side of the side plate 12 close to the side wall 23, and when the backlight module 100 is assembled, the fourth convex portions 43 can be engaged with the corresponding second concave portions 44, so as to improve the fixing firmness between the back plate 10 and the rubber frame 20, thereby facilitating to improve the stability of the backlight module 100.

It should be noted that fig. 13 only shows one fourth convex portion 43 and one second concave portion 44, but the number of convex portions on the side wall 23 and concave portions on the side plate 13 is not particularly limited in the present application.

It should be noted that, the present application is not limited to the backlight module 100 being able to provide only the third protruding portion 41 and the first recessed portion 42 having a corresponding relationship, or being able to provide only the fourth protruding portion 43 and the second recessed portion 44 having a corresponding relationship. Under the conditions of space allowance, condition allowance and reliability allowance, the third convex part 41 and the first concave part 42 which have corresponding relations can be arranged, and the fourth convex part 43 and the second concave part 44 which have corresponding relations can be arranged at the same time.

Moreover, the present application does not limit the specific shapes of the protruding portion and the recessed portion, as long as the fixing firmness between the back plate 10 and the rubber frame 20 can be improved when the backlight module 100 is assembled and integrated.

With reference to fig. 11, 12 and 13, alternatively, a side surface of the side plate 12 away from the bottom plate 11 is wedged with a side surface of the first protrusion 21 close to the bottom plate 11.

Specifically, in order to further improve the fixing firmness between the backboard 10 and the rubber frame 20, the present application also provides an alternative embodiment that a side surface of the side plate 12 away from the bottom plate 11 is wedged with a side surface of the first protruding portion 21 close to the bottom plate 11; specifically, for example, the surface of the side of the first protruding portion 21 close to the bottom plate 11 has at least one sub-recessed portion/sub-protruding portion, and the surface of the side plate 12 away from the bottom plate 11 has a sub-protruding portion/sub-recessed portion corresponding to the sub-recessed portion/sub-protruding portion, when the back plate 10 and the rubber frame 20 are assembled, the sub-protruding portion and the sub-recessed portion can be engaged with each other, so as to improve the fixing firmness between the back plate 10 and the rubber frame 20, and to facilitate the improvement of the stability of the backlight module 100.

It should be noted that fig. 12 and 13 of the present application only show a wedge-fitting manner, but the present application is not limited thereto, and the back plate 10 and the rubber frame 20 may be fixed by selecting a manner of engaging the corresponding protrusion and the corresponding recess, or engaging the inclined surface, the triangular surface, or the serrated surface, or the like, and the present application does not limit the specific details of the manner of engaging, or the like used when the back plate 10 and the rubber frame 20 are fixed, as long as the fixing firmness between the back plate 10 and the rubber frame 20 can be improved.

Fig. 14 is a schematic view of a rubber frame according to an embodiment of the present application, please refer to fig. 14 based on fig. 4 to 11, and optionally, the first protrusion 21 is disposed around the light guide plate 30.

Specifically, it should be noted that, in the present application, the first protruding portion 21 additionally disposed in the rubber frame 20 is selectively disposed around the light guide plate 30, so that the optical film layer S1 in the backlight module 100 expands and extends in each direction without being damaged by being squeezed, and the optical film layer S1 is provided with an enough expansion space in each direction, thereby ensuring the practicability of the optical film layer S1 in different environments, and further prolonging the service life of the backlight module 100.

In addition, when the first protruding portion 21 surrounds the light guide plate 30, that is, the first protruding portion 21 is a whole strip, so the arrangement can ensure that a large enough contact area is formed between the upper surface of the side plate 12 in the back plate 10 and the lower surface of the first protruding portion 21 in the rubber frame 20, the support area of the side plate 12 for the first protruding portion 21 is larger, the support strength of the side plate 12 for the first protruding portion 21 is improved, and the stability of the backlight module 100 is improved.

Fig. 15 is another schematic view of a rubber frame according to an embodiment of the present application, please refer to fig. 14 and fig. 15 on the basis of fig. 4 to fig. 11, it should be noted that the present application is not limited thereto, and in addition to disposing the first protrusion portion 21 around the light guide plate 30, an alternative embodiment is also provided in the present application, optionally, the first protrusion portion 21 includes a plurality of first sub-protrusion portions 211, and a first gap is included between two adjacent first sub-protrusion portions 211.

Specifically, the first protruding portions 21 are not entirely disposed around the side of the light guide plate 30, but are formed by a plurality of first sub-protruding portions, that is, a first gap exists between two adjacent first sub-protruding portions 211, so that the sufficient expansion space of the optical film S1 in each direction can be provided, the practicability of the optical film S1 in different environments is ensured, the use of manufacturing materials can be saved, and the manufacturing cost of the backlight module 100 is reduced.

In addition, when the first convex portion 21 is composed of a plurality of first sub-convex portions 211, it corresponds to the sectional arrangement of the first sub-convex portions 211; so set up, the flexibility between two adjacent first sub-bellying 211 in the gluey frame 20 can be kept to make the edge of gluing frame 20 softer, be convenient for glue the equipment between frame 20 and the backplate 10, reduce gluey frame 20 because of the too hard crack damage scheduling problem that causes of material in the assembling process, be favorable to improving backlight unit 100's yield. In addition, the plurality of first sub-protrusions 211 arranged on the opposite side edges can be arranged symmetrically, so that the opposite side edges of the rubber frame 20 can have approximately the same flexibility; of course, this application is not so limited, but is merely provided as an alternative embodiment.

Meanwhile, an optional embodiment provided in the present application is that at least 3 sections of the first sub-protrusions 211 may be disposed on one side of the rubber frame 20 extending along the same direction, so that each side of the rubber frame 20 is more flexible, and the rubber frame 20 and the back plate 10 can be assembled and fastened conveniently. If the number of the first sub-protrusions 211 in one edge is less than 3, the edge of the rubber frame 20 is not flexible enough, which affects the assembly efficiency between the rubber frame 20 and the back plate 10. It should be noted that this is only an alternative embodiment provided by the present application, and the present application is not limited thereto, and the number of the first sub-protrusions 211 in one side of the rubber frame 20 may be adjusted by a user according to actual situations.

It should be noted that the drawings in fig. 14 and 15 are filled with the differences described above only to clearly illustrate the arrangement of the first protruding portion 21, and do not represent the first protruding portion 21, the second protruding portion 22, the side wall 23, and the differences described above in fig. 14 and 15.

Fig. 16 is a schematic diagram of a display device according to an embodiment of the present invention, fig. 17 is a BB' cross-sectional view of the display device according to the embodiment of the present invention, please refer to fig. 16 and fig. 17 based on fig. 4-fig. 15, and based on the same inventive concept, the present invention further provides a display device 300, wherein the display device 300 includes a backlight module 100; the display device 300 further includes a display panel 200, and the display panel 200 is located on the light-emitting surface side of the backlight module 100. The backlight module 100 is any one of the backlight modules 100 provided in the present application.

It should be noted that, for the embodiments of the display device provided in the embodiments of the present application, reference may be made to the embodiments of the display panel described above, and repeated descriptions are omitted. The display device provided by the application can be: any product and component with a display function, such as a mobile phone, a tablet personal computer, a television, a step wiring area, a notebook computer, a vehicle-mounted display screen, a navigator and the like.

By the embodiment, the backlight module and the display device provided by the invention at least realize the following beneficial effects:

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A backlight module, comprising:

a back plate comprising a bottom plate;

2. The backlight module according to claim 1, wherein a side surface of the first protruding portion close to the second protruding portion is flush with a side surface of the light guide plate away from the bottom plate along a light emitting direction of the backlight module; or, a first distance is included between one side surface of the first protruding portion close to the second protruding portion and one side surface of the light guide plate far away from the bottom plate.

3. The backlight module as claimed in claim 2, wherein the first distance is D ≧ 0.3 mm.

4. A backlight module according to claim 1, wherein a side surface of the second protrusion near the bottom plate is parallel to the bottom plate;

follow backlight unit's light-emitting direction, first bellying is close to a side surface of second bellying with the second bellying is close to interval between a side surface of bottom plate is H, follows the lateral wall points to the direction of light guide plate one side, interval H crescent.

5. A backlight module according to claim 4, wherein a side surface of the first protruding portion adjacent to the second protruding portion is a flat surface or an arc surface.

6. A backlight module according to claim 1, wherein the chassis base comprises a first region and a second region surrounding the first region; the orthographic projection of the light guide plate on the bottom plate is positioned in the first area;

one side surface of the first protruding part close to the bottom plate is in contact with the bottom plate, and an orthographic projection of the one side surface of the first protruding part close to the bottom plate and the second area at least partially overlap.

7. A backlight module according to claim 1, wherein the chassis base comprises a first region and a second region surrounding the first region; the orthographic projection of the light guide plate on the bottom plate is positioned in the first area;

the back plate further comprises a side plate; the side plate is positioned on one side, close to the optical film layer, of the bottom plate, and the orthographic projection of the side plate on the bottom plate is positioned in the second area;

one side surface of the first protruding part close to the bottom plate is in contact with one side surface of the side plate far away from the bottom plate.

8. The backlight module according to claim 7, wherein the side plate comprises a third protrusion portion, and the third protrusion portion is located on a side of the side plate away from the light guide plate;

the sidewall includes a first recess corresponding to the third protrusion.

9. The backlight module according to claim 7, wherein the sidewall comprises a fourth protrusion, and the fourth protrusion is located on a side of the sidewall close to the light guide plate and on a side of the first protrusion far from the second protrusion;

the side plate includes a second recess corresponding to the fourth protrusion.

10. The backlight module according to claim 7, wherein a side surface of the side plate away from the bottom plate is wedged with a side surface of the first protrusion close to the bottom plate.

11. The backlight module as claimed in claim 1, wherein the first protrusion is disposed around the light guide plate.

12. The backlight module as claimed in claim 11, wherein the first protrusions comprise a plurality of first sub-protrusions, and a first gap is formed between two adjacent first sub-protrusions.

13. A display device, characterized in that the display device comprises a backlight module according to any one of claims 1-12;