CN112666753A - Backlight module, liquid crystal display module and liquid crystal display device - Google Patents

Abstract

The invention discloses a backlight module, a liquid crystal display module and a liquid crystal display device, wherein the backlight module comprises a through hole and a back plate, and the through hole penetrates through the backlight module; the backboard comprises a first backboard subsection, a second backboard subsection and a third backboard subsection, the first backboard subsection is arranged around the through hole, the plane where the second backboard subsection is located is intersected with the central axis of the through hole, and the curved surface where the first backboard subsection is located is intersected with the plane where the second backboard subsection is located; the second backplane section is located on a side of the third backplane section away from the first backplane section along the first direction; in the second direction, the second backplane section is located at a side of the third backplane section remote from the first backplane section; the extension direction of the third backplate subsection intersects the extension direction of the first backplate subsection and/or the extension direction of the second backplate subsection in a plane passing through the central axis. The scheme can reduce the requirement on the stretching height of the back plate at the position of the through hole, so that the liquid crystal display module is lighter in weight and higher in screen ratio.

Description

Backlight module, liquid crystal display module and liquid crystal display device

Technical Field

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

Background

With the development of display technology, display devices are gradually developing towards high screen occupation ratio, light weight and thinness and function diversification, so as to bring better use experience for users.

In order to enable the display device to have high screen occupation ratio and a front camera function at the same time, the technology of the camera under the screen is developed. Taking the liquid crystal display module as an example, the mode of arranging the through hole on the backlight module to accommodate the front camera can realize high screen ratio and front camera function. The backlight module includes a back plate (iron plate) and a space for accommodating optical components such as a light source and a light guide plate can be formed by processing the back plate. The prior art generally adopts the following scheme to form through holes on the backlight module: firstly, digging a hole on the back plate corresponding to the camera shooting area, stretching the back plate upwards along the edge of the hole to form a side wall surrounding the through hole, and then placing the optical assembly in the space of the back plate formed by the through hole.

However, the stretching height of the side walls is generally limited by the thickness of the back plate, the ductility of the back plate material and the diameter of the through holes, and the thinner the thickness of the back plate, the smaller the stretching height, the smaller the diameter of the through holes and the smaller the stretching height, while ensuring that the back plate at the through holes does not break during stretching. The optical assembly has a certain thickness, and if the stretching height of the back plate at the position of the through hole is too small, the requirement for accommodating the optical assembly cannot be met.

In view of this, as the screen occupation ratio increases (the aperture of the through hole becomes smaller) and the weight of the liquid crystal display module decreases (weight reduction is usually achieved by thinning the back plate), the stretching height of the back plate at the position of the through hole may not satisfy the requirement of accommodating the optical component.

Disclosure of Invention

The embodiment of the invention provides a backlight module, a liquid crystal display module and a liquid crystal display device, which are used for reducing the requirement on the stretching height of a back plate at a through hole position, so that the liquid crystal display module is lighter in weight and higher in screen occupation ratio.

In a first aspect, an embodiment of the present invention provides a backlight module, including: the through hole penetrates through the backlight module;

the backlight module also comprises a back plate, wherein the back plate comprises a first back plate subsection, a second back plate subsection and a third back plate subsection connecting the first back plate subsection and the second back plate subsection, the first back plate subsection is arranged around the through hole, the plane where the second back plate subsection is located is intersected with the central axis of the through hole, and the curved surface where the first back plate subsection is located is intersected with the plane where the second back plate subsection is located;

the second backplane section is located on a side of the third backplane section away from the first backplane section along the first direction; in the second direction, the second backplane section is located at a side of the third backplane section remote from the first backplane section; the extension direction of the third backplate subsection intersects the extension direction of the first backplate subsection and/or the extension direction of the second backplate subsection in a plane passing through the central axis; the first direction is parallel to the extending direction of the central axis, and the second direction intersects with the extending direction of the central axis.

In a second aspect, an embodiment of the present invention further provides a liquid crystal display module, including the backlight module provided in the previous aspect;

the liquid crystal display module also comprises a liquid crystal display panel positioned on one side of the light-emitting surface of the backlight module.

In a third aspect, an embodiment of the present invention further provides a liquid crystal display device, including the liquid crystal display module provided in the above aspect.

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

in the embodiment of the invention, the backboard comprises a first backboard subsection, a second backboard subsection and a third backboard subsection connecting the first backboard subsection and the second backboard subsection, the second backboard subsection is positioned at one side of the third backboard subsection far away from the first backboard subsection along a first direction parallel to the central axis, the second backboard subsection is positioned at one side of the third backboard subsection far away from the first backboard subsection along a second direction intersecting with the central axis, and the extending direction of the third backboard subsection intersects with the extending direction of the first backboard subsection and/or the extending direction of the second backboard subsection on a plane passing through the central axis, so that a sink groove structure can be formed by the third backboard subsection. Because the height that holds optical assembly needs is certain, and the heavy groove also has certain height, therefore the formation of heavy groove can reduce the high requirement to first backplate subsection, and then can select for use the backplate that thickness is thinner and form the through-hole of littleer aperture, makes liquid crystal display module's weight lighter, the screen account for than higher.

Drawings

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a backlight module taken along line BB' in FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along line BB' in FIG. 1 of another backlight module;

FIG. 4 is a schematic cross-sectional view taken along line BB' in FIG. 1 of another backlight module;

FIG. 5 is a schematic cross-sectional view taken along line BB' in FIG. 1 of another backlight module;

FIG. 6 is a schematic cross-sectional view taken along line BB' in FIG. 1 of another backlight module;

FIG. 7 is a schematic cross-sectional view taken along line BB' in FIG. 1 of another backlight module;

FIG. 8 is a schematic cross-sectional view taken along line BB' in FIG. 1 of another backlight module;

FIG. 9 is a schematic view of a liquid crystal display module according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a cross-section of the backlight module taken along BB' in fig. 1, referring to fig. 1, the backlight module 1 includes a through hole 101 and a back plate 11; referring to fig. 2, the through hole 101 penetrates through the backlight module 1; the backplane 11 comprises a first backplane subsection 111, a second backplane subsection 112 and a third backplane subsection 113 connecting the first backplane subsection 111 and the second backplane subsection 112, wherein the first backplane subsection 111 is disposed around the through hole 101, a plane of the second backplane subsection 112 intersects with a central axis CC' of the through hole 101, and a curved surface of the first backplane subsection 111 intersects with a plane of the second backplane subsection 112; in the first direction, the second backplane section 112 is located at a side of the third backplane section 113 remote from the first backplane section 111; in the second direction, the second backplane section 112 is located at a side of the third backplane section 113 remote from the first backplane section 111; in a plane (e.g. the plane shown in fig. 2) passing through the central axis CC' the extension direction of the third backplate subsection 113 intersects the extension direction of the first backplate subsection 111 and/or the extension direction of the second backplate subsection 112; the first direction is parallel to the extension direction of the central axis CC 'and the second direction intersects the extension direction of the central axis CC'.

For example, the structure of the back plate 11 shown in fig. 2 can be formed according to the following process: first, a back plate (with an unlimited thickness) is provided, then, the back plate is punched corresponding to the image pickup area to form a sink, then, a hole is dug in the sink corresponding to the image pickup area, and finally, the back plate is turned over along the edge of the hole to form the back plate 11 shown in fig. 2. For example, the material of the back plate may be iron.

The folded portion corresponds to the first back panel subsection 111, and the height of the first back panel subsection 111 is H (inner side height), which is the above-mentioned stretching height of the back panel 11 at the position of the through hole 101. The sinking groove portion corresponds to the third plate subsection 113, and the non-punched portion of the back plate 11 corresponds to the second plate subsection 112. As can be seen from fig. 2, by forming the third backplane section 113, a sinker can be formed with the third backplane section 113, which sinker has a height h (inside height) in the first direction, and thus can accommodate a portion of the optical components, avoiding that the first backplane section 111 is not high enough to accommodate the optical components.

Meanwhile, since the thickness of the optical assembly is constant, as long as the sum of the height H of the first back plate subsection 111 and the height H of the sink is greater than or equal to the thickness of the optical assembly, the requirement of accommodating the optical assembly can be satisfied. Therefore, by increasing the height of the sinking groove, the height requirement for the first backboard subsection 111 can be reduced, and then the backboard 11 with thinner thickness and the through hole 101 with smaller aperture can be selected, so that the liquid crystal display module has lighter weight and higher screen occupation ratio.

It should be noted that the structure of the third backplane section 113 in fig. 2 is only an illustration, but not a limitation, and the structure of the third backplane section 113 will be further described in detail with reference to other figures.

Specifically, in a plane passing through the central axis CC', the extending direction of the third backplate portion 113 may have only one direction, or may have a plurality of different directions, and specifically, the extending direction may be determined according to the shape of the third backplate portion 113. Therefore, in a plane passing through the central axis CC', the extending direction of the third backplane section 113 intersects the extending direction of the first backplane section 111 and/or the extending direction of the second backplane section 112, and it can be understood that the third backplane section 113 has a portion intersecting the extending direction of the first backplane section 111, or has a portion intersecting the extending direction of the second backplane section 112, or has a portion intersecting both the extending directions of the first backplane section 111 and the second backplane section 112, and those skilled in the art can set this according to the needs, and this is not limited by the embodiment of the present invention, and all the solutions that reduce the height requirement for the first backplane section 111 (the backplane 11 of the folded portion at the position of the through hole 101) by forming the third backplane section 113 (the sunken groove) are within the protection scope of the present invention.

In the embodiment of the invention, the backboard comprises a first backboard subsection, a second backboard subsection and a third backboard subsection connecting the first backboard subsection and the second backboard subsection, the second backboard subsection is positioned at one side of the third backboard subsection far away from the first backboard subsection along a first direction parallel to the central axis, the second backboard subsection is positioned at one side of the third backboard subsection far away from the first backboard subsection along a second direction intersecting with the central axis, and the extending direction of the third backboard subsection intersects with the extending direction of the first backboard subsection and/or the extending direction of the second backboard subsection on a plane passing through the central axis, so that the third backboard subsection can be used for forming the sink groove. Because the height that holds optical assembly needs is certain, and the heavy groove has certain height, therefore the formation of heavy groove can reduce the high requirement to first backplate subsection, and then can select for use the backplate that thickness is thinner and form the through-hole of littleer aperture, makes liquid crystal display module's weight lighter, the screen account for than higher.

On the basis of the above embodiments, the following describes the technical solution of the embodiment of the present invention in further detail with reference to the structure of the third backplane subsection.

With continued reference to fig. 2, optionally, the backlight module further includes a reflective sheet 12 and a light guide plate 13, the reflective sheet 12 and the light guide plate 13 are disposed in the space defined by the back plate 11, and the reflective sheet 12 is located between the back plate 11 and the light guide plate 13; along the first direction, the projected length (i.e. h) of the third back plate subsection 113 is greater than or equal to the thickness of the reflective sheet 12 and less than the sum of the thicknesses of the reflective sheet 12 and the light guide plate 13.

Specifically, the backlight module usually further includes an upper diffusion sheet, a lower diffusion sheet, an upper brightness enhancement sheet, a lower brightness enhancement sheet and other optical components on one side of the light guide plate departing from the reflection sheet, so as to improve the light emitting effect of the backlight module and improve the display effect of the liquid crystal display module. In the prior art, if the stretching height of the back plate of the folded part is small, the thickness of the optical assembly on the side of the light guide plate away from the reflective sheet is often reduced, so that the back plate can sufficiently accommodate all the optical assemblies. However, this solution will reduce the light-emitting effect of the backlight module. In the embodiment, the projection length (i.e. H) of the third back plate subsection 113 along the first direction is set to be greater than or equal to the thickness of the reflective sheet 12 and smaller than the sum of the thicknesses of the reflective sheet 12 and the light guide sheet, so that the height (i.e. H + H) of the inner side of the back plate 11 is enough to accommodate the optical assembly to be set, and the thickness of the optical assembly does not need to be reduced, thereby ensuring that the backlight module has a good light emitting effect.

For example, fig. 2 illustrates that the projection length (i.e., h) of the third back plate subsection 113 along the first direction is equal to the thickness of the reflective sheet 12. The thickness of the reflective sheet 12 is about 0.08mm, and the thickness of the lower brightness enhancement film is about 0.065mm, so that the height (h) of the inner side of the back plate 11 increased by the third back plate sub-section 113 is enough to accommodate the lower brightness enhancement film (see fig. 2, the side of the light guide plate 13 away from the reflective sheet 12 is provided with the lower diffusion sheet 14, the lower brightness enhancement film 15, the upper brightness enhancement film 16 and the upper diffusion sheet 17), thereby avoiding the use of a composite film and ensuring the display effect of the backlight module.

It should be noted that fig. 2 only illustrates that the projection length (i.e., H) of the third backplane section 113 along the first direction is equal to the thickness of the reflective sheet 12, and it can be understood that, when the projection length of the third backplane section 113 along the first direction is further increased, on one hand, more film layers for improving the light-emitting effect of the backlight module can be accommodated, and on the other hand, the requirement on the height (i.e., H) of the first backplane section 111 can be reduced.

Of course, the projection length of the third plate sub-section 113 along the first direction cannot be infinitely increased, which is limited by the ductility of the back plate 11 on the one hand, and on the other hand, it can be understood that the light guide plate 13 is used to convert the light emitted from the light source into a uniform surface light source, and in order to ensure the display effect of the lcd module, it is necessary to ensure that the light guide plate 13 is located in the display area AA entirely, and preferably in the non-display area NA partially (as shown in fig. 2). In this embodiment, the projection length of the third back plate sub-portion 113 along the first direction is smaller than the sum of the thicknesses of the reflective sheet 12 and the light guide plate 13, so as to ensure the coverage area of the light guide plate 13, thereby ensuring the display effect of the liquid crystal display module.

In addition, as shown in fig. 2, optionally, a gap is formed between the light guide plate 13 and the first backplane section 111 along the second direction, so that a shrinking and expanding space can be provided for the light guide plate 13, and damage to the backlight module during the test process can be avoided. Preferably, the light guide plates 13 are spaced apart from the first backplane subsection 111 by the same gap distance to ensure that the light guide plates 13 at different heights have the same expansion space.

In summary, the design principle of the third backplane section 113 according to the embodiment of the present invention is that the projection length (i.e. h) of the third backplane section 113 along the first direction is greater than or equal to the thickness of the reflective sheet 12 and less than the sum of the thicknesses of the reflective sheet 12 and the light guide plate 13, and the structure of the third backplane section 113 is further exemplified with reference to the drawings.

With continued reference to fig. 2, optionally, the third backplane section 113 includes a first sub-section 1131 and a second sub-section 1132 connected to each other, the first sub-section 1131 is connected to the first backplane section 111, and the second sub-section 1132 is connected to the second backplane section 112; the plane of the first sub-section 1131 is parallel to the plane of the second backplate section 112, and the extending direction of the second sub-section 1132 intersects both the extending direction of the first backplate section 111 and the extending direction of the second backplate section 112 on the plane passing through the central axis CC'; the projected length (i.e. h) of the second sub-portion 1132 is greater than or equal to the thickness of the reflective sheet 12 and less than the sum of the thicknesses of the reflective sheet 12 and the light guide plate 13 along the first direction.

In this embodiment, by forming the stepped third plate subsection 113 during the formation of the sunken groove, only the second subsection 1132 may be stretched and thinned, so that the thickness of the first subsection 1131 is substantially the same as that of the second plate subsection 112, and thus, when the first subsection 1131 is formed by digging a hole and folding back, the thickness of the first subsection 1131 is not reduced, thereby avoiding the influence on the stretching degree of the first plate subsection 111, i.e. reducing the height of the first plate subsection 111.

Fig. 3 is a schematic cross-sectional view of another backlight module taken along BB' in fig. 1, referring to fig. 3, and further alternatively, the light guide plate 13 includes a first light guiding subsection 131 and a second light guiding subsection 132 connected to each other, the second light guiding subsection 132 is located at a side of the first light guiding subsection 131 away from the first backplane subsection 111, and a vertical projection of the first light guiding subsection 131 in a plane where the second backplane subsection 112 is located overlaps a vertical projection of the first subsection 1131 in a plane where the second backplane subsection 112 is located.

As can be seen from fig. 2, in the second direction, the third backplane section 113 occupies a part of the installation space of the reflective sheet 12 and the light guide plate 13, and the area of the non-display area at the position of the through hole 101 is limited, and if the reflective sheet 12 and the light guide plate 13 are both installed on the side of the third backplane section 113 far away from the through hole 101 as shown in fig. 2, the coverage area of the light guide plate 13 may be smaller than the area of the display area. In addition, in order to ensure that the coverage area of the light guide plate 13 is larger than or equal to the display area, it is desirable that the projection length of the third back plate subsection 113 along the second direction is as small as possible, so that the inclination degree of the second sub-subsection 1132 is increased, the risk of breakage of the second sub-subsection 1132 during the processing is increased, or the distance between the first back plate subsection 111 and the light guide plate 13 is shortened, which results in insufficient expansion space of the light guide plate 13.

Therefore, in order to avoid the above situation, in the present embodiment, a portion of the light guide plate 13 (i.e., the first light guide subsection 131) close to the through hole 101 is overlapped with the vertical projection of the first subsection 1131, so as to ensure that the coverage area of the light guide plate 13 is greater than or equal to the coverage area of the display area, and the expansion space of the light guide plate 13, and also avoid the breakage of the back plate 11 during the processing process, and ensure the yield during the processing of the back plate 11.

It should be noted that fig. 2 and 3 only illustrate that the projection length (i.e., h) of the second sub-portion 1132 along the first direction is equal to the reflective sheet 12.

Exemplarily, fig. 4 is a schematic cross-sectional structure view of another backlight module taken along BB' in fig. 1, referring to fig. 4, further alternatively, the thickness of the first light guiding subsection 131 is smaller than the thickness of the second light guiding subsection 132 along the first direction.

As shown in fig. 4, by performing thinning processing on the portion of light guide plate 13 (i.e., first light guide subsection 131) close to one side of through hole 101, the projection length of second subsection 1132 along the first direction can be further increased, i.e., the height h of the sink groove is increased. Thus, when the thickness of the optical components such as the light guide plate 13 is constant, the height H of the sinking groove is increased, so that the height H of the first back plate subsection 111 can be reduced, and the back plate 11 with a thinner thickness and the through holes 101 with smaller apertures can be selected, so that the weight of the liquid crystal display module is lighter and the screen occupation ratio is higher.

Referring to fig. 3 or fig. 4, as a further alternative, a reflective film 18 is disposed on a side of the third back plate subsection 113 close to the light guide plate 13, the reflective film 18 overlaps the reflective sheet 12, and a vertical projection of the reflective film 18 and the reflective sheet 12 on a plane of the second back plate subsection 112 covers a vertical projection of the light guide plate 13 on a plane of the second back plate subsection 112.

As can be seen from fig. 3 and 4, since the first sub-section 1131 vertically projects and overlaps with the first light guiding section 131, the arrangement space of the reflective sheet 12 is occupied by the third back plate section 113, and thus the whole light guiding plate 13 cannot be covered, resulting in a reduction in light extraction efficiency of the backlight module. In this embodiment, the reflective film 18 is disposed at one side of the third backplane subsection 113 close to the light guide plate 13, so that the vertical projection of the reflective film 18 and the reflective sheet 12 on the plane of the second backplane subsection 112 covers the vertical projection of the light guide plate 13 on the plane of the second backplane subsection 112, thereby ensuring that the light incident on the reflective sheet 12 or the reflective film 18 can be reflected to the light emitting side of the backlight module, and ensuring the light emitting efficiency of the backlight module.

It should be noted that even if the vertical projections of the first sub-sub.

In summary, the above embodiments describe the structure of the backlight module in detail based on the stepped third backplane section, and another alternative is provided as an example below.

Fig. 5 is a schematic cross-sectional view of another backlight module taken along BB 'in fig. 1, and referring to fig. 5, alternatively, the extending direction of the third back plate subsection 113 intersects both the extending direction of the first back plate subsection 111 and the extending direction of the second back plate subsection 112 in a plane passing through the central axis CC'.

In this way, since the third back plate subsection 113 is an oblique curved surface, the first back plate subsection 111 is more easily formed by folding, and the processing process is simpler.

In addition, since the stepped third backplate subsection 113 shown in fig. 2 has the first sub-subsection 1131 parallel to the plane of the second backplate subsection 112, and the sloped third backplate subsection shown in fig. 5 has no part parallel to the plane of the second backplate subsection, the slope of the third backplate subsection shown in fig. 5 is less than the slope of the second sub-subsection 1132 shown in fig. 2 when the projection length of the third backplate subsection 113 in the first direction (i.e. the sinker height h) is the same as the projection length of the third backplate subsection 113 in the second direction, so that the third backplate subsection is stretched to a smaller extent in this embodiment, and is easier to stretch, and the fracture risk during stretching is less, which is beneficial to ensuring the reliability of the backplate.

Fig. 6 is a schematic cross-sectional view of another backlight module taken along BB' in fig. 1, referring to fig. 6, and further alternatively, in the second direction, the light guide plate 13 includes a third light guiding subsection 133 and a fourth light guiding subsection 134 connected to each other, the fourth light guiding subsection 134 is located at a side of the third light guiding subsection 133 away from the first backplane subsection 111, and a vertical projection of the third light guiding subsection 133 onto a plane where the second backplane subsection 112 is located overlaps a vertical projection of the third backplane subsection 113 onto a plane where the second backplane subsection 112 is located.

As described above, such an arrangement can ensure that the coverage area of the light guide plate 13 is greater than or equal to the coverage area of the display area, and avoid that the coverage area of the light guide plate 13 is smaller than the coverage area of the display area due to the third rear plate sub-portion 113 occupying the space of the light guide plate 13, which is not described herein again.

For example, fig. 6 illustrates that the projection length (i.e. h) of the third back plate subsection 113 in the first direction is equal to the thickness of the reflective sheet 12, such arrangement can prevent the light guide plate 13 from contacting the third back plate subsection 113, and further prevent the expansion space of the light guide plate 13 from being compressed, thereby ensuring the quality of the backlight module.

Further, fig. 7 is a schematic cross-sectional view of another backlight module taken along BB' in fig. 1, referring to fig. 7, alternatively, a side of the third light guiding sub-section 133 close to the third back plate sub-section 113 has a unfilled corner, and the third back plate sub-section 113 and the third light guiding sub-section 133 are not in contact.

In this embodiment, the unfilled corner is disposed on the side of the third light guiding sub 133 close to the third back plate sub 113, so that the height H of the sinking groove can be further increased, the requirement for the height H of the first back plate sub 111 is reduced, and further the back plate 11 with a thinner thickness and the through hole 101 with a smaller aperture can be selected, so that the liquid crystal display module has a lighter weight and a higher screen occupation ratio. In addition, since the projection length (i.e. h) of the third back plate subsection 113 along the first direction is increased, that is, the inclination degree of the third back plate subsection 113 is increased, a notch is disposed at a side of the third light guiding subsection 133 close to the third back plate subsection 113, so that the light guiding plate 13 is prevented from contacting the third back plate subsection 113, and the expansion space of the light guiding plate 13 is prevented from being compressed, thereby ensuring the quality of the backlight module.

With reference to fig. 7, optionally, a reflective film 18 is disposed on a side of the third backplane section 113 close to the light guide plate 13, the reflective film 18 overlaps the reflective sheet 12, and a vertical projection of the reflective film 18 and the reflective sheet 12 on the plane of the second backplane section 112 covers a vertical projection of the light guide plate 13 on the plane of the second backplane section 112.

Similar to the arrangement of the reflective film 18 in fig. 3 and 4, in the embodiment, the reflective film 18 is disposed on the side of the third backplane section 113 close to the light guide plate 13, so that the vertical projection of the reflective film layer 18 and the reflective sheet 12 on the plane where the second backplane section 112 is located covers the vertical projection of the light guide plate 13 on the plane where the second backplane section 112 is located, thereby ensuring that the light incident to the reflective sheet 12 or the reflective film 18 can be reflected to the light exit side of the backlight module, and ensuring the light exit efficiency of the backlight module.

In addition, fig. 8 is a schematic cross-sectional view of another backlight module taken along BB' in fig. 1, and referring to fig. 8, the reflective sheet 12 optionally includes a first reflective sub-section 121 and a second reflective sub-section 122, a vertical projection of the first reflective sub-section 121 on the plane where the second back-plate sub-section 112 is located overlaps with a vertical projection of the third back-plate sub-section 113 on the plane where the second back-plate sub-section 112 is located, and the second reflective sub-section 122 is located between the light guide plate 13 and the second back-plate sub-section 112.

In this embodiment, since the third back plate subsection 113 is an oblique curved surface, and the bending degree is lower compared to the stepped third back plate subsection 113, so as to facilitate bending of the reflective sheet 12, by bending the reflective sheet 12, the vertical projection of the first reflective subsection 121 on the plane where the second back plate subsection 112 is located is overlapped with the vertical projection of the third back plate subsection 113 on the plane where the second back plate subsection 112 is located, and the second reflective subsection 122 is located between the light guide plate 13 and the second back plate subsection 112, so that the vertical projection of the reflective sheet 12 on the plane where the second back plate subsection 112 is located covers the vertical projection of the light guide plate 13 on the plane where the second back plate subsection 112 is located, and the light extraction efficiency of the backlight module is ensured.

The first reflection sub-portion 121 may be in contact with the third light guiding sub-portion 133, or may not be in contact with the third light guiding sub-portion 133, which is not limited in the embodiment of the present invention.

In summary, the structure of the backlight module is described in detail based on the oblique-surface-type third backplane section in the above embodiments, and those skilled in the art can select the arrangement manner according to the requirement.

Further, as described above, the smaller the thickness of the back sheet 11, the smaller the stretched height of the folded-back portion (i.e., the first back sheet section 111) is. By adopting the technical scheme of the embodiment of the invention, the requirement on the height of the first back plate subsection 111 can be reduced, so that a thinner back plate 11 can be adopted, and the weight of the liquid crystal display module is lighter. Optionally, along the first direction, the thickness D of the back plate 11 satisfies 0.05mm ≤ D ≤ 0.08 mm. Specifically, the thickness of the second backplate subsection 112 along the first direction ranges from 0.05mm to 0.08 mm. By reducing the weight of the back plate 11, the display panel is advantageously thinned.

Based on the same inventive concept, an embodiment of the present invention further provides a liquid crystal display module, fig. 9 is a schematic structural diagram of the liquid crystal display module provided in the embodiment of the present invention, and referring to fig. 9, a liquid crystal display module 10 includes the backlight module 1 provided in any one of the embodiments, and further includes a liquid crystal display panel 2 located on a light emitting surface side of the backlight module 1, so that the liquid crystal display module has the same beneficial effects as the backlight module, can achieve a high screen occupation ratio and lighter weight, and the same points can refer to the description of the embodiment of the backlight module, and are not repeated herein. In addition, the structure of the liquid crystal display panel 2 and the assembling method of the liquid crystal display panel 2 and the backlight module 1 are not described herein, and those skilled in the art can design the structure by themselves.

Based on the same inventive concept, an embodiment of the present invention further provides a liquid crystal display device, fig. 10 is a schematic structural diagram of the liquid crystal display device provided in the embodiment of the present invention, and referring to fig. 10, the liquid crystal display device 100 includes the liquid crystal display module 10 provided in the embodiment, so that the liquid crystal display device has the same beneficial effects as the backlight module, and the same points can refer to the description of the embodiment of the backlight module, and are not repeated herein. The display device 100 provided in the embodiment of the present invention may be a mobile phone as shown in fig. 10, and may also be any electronic product with a display function, including but not limited to the following categories: the touch screen display system comprises a television, a notebook computer, a desktop display, a tablet computer, a digital camera, an intelligent bracelet, intelligent glasses, a vehicle-mounted display, medical equipment, industrial control equipment, a touch interaction terminal and the like, and the embodiment of the invention is not particularly limited in this respect.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (13)

1. A backlight module, comprising: the through hole penetrates through the backlight module;

the backlight module further comprises a back panel, wherein the back panel comprises a first back panel subsection, a second back panel subsection and a third back panel subsection connecting the first back panel subsection and the second back panel subsection, the first back panel subsection is arranged around the through hole, the plane where the second back panel subsection is located is intersected with the central axis of the through hole, and the curved surface where the first back panel subsection is located is intersected with the plane where the second back panel subsection is located;

in a first direction, the second backplane subsection is located on a side of the third backplane subsection away from the first backplane subsection; in a second direction, the second backplane subsection is located on a side of the third backplane subsection away from the first backplane subsection; in a plane passing through the central axis, the extension direction of the third backplate subsection intersects the extension direction of the first backplate subsection and/or the extension direction of the second backplate subsection; the first direction is parallel to the extending direction of the central axis, and the second direction intersects the extending direction of the central axis.

2. The backlight module according to claim 1, further comprising a reflective sheet and a light guide plate, wherein the reflective sheet and the light guide plate are disposed in the space defined by the back plate, and the reflective sheet is located between the back plate and the light guide plate;

along the first direction, the projection length of the third back plate subsection is larger than or equal to the thickness of the reflector plate and smaller than the sum of the thicknesses of the reflector plate and the light guide plate.

3. The backlight module as claimed in claim 2, wherein the third backplane section comprises a first sub-section and a second sub-section connected to each other, the first sub-section being connected to the first backplane section, the second sub-section being connected to the second backplane section;

the plane of the first subpartition is parallel to the plane of the second back plate subsection, and the extending direction of the second subpartition intersects with the extending direction of the first back plate subsection and the extending direction of the second back plate subsection on the plane passing through the central axis;

along the first direction, the projection length of the second subsection is larger than or equal to the thickness of the reflector plate and smaller than the sum of the thicknesses of the reflector plate and the light guide plate.

4. The backlight module according to claim 3, wherein the light guide plate comprises a first light guide subsection and a second light guide subsection connected to each other along the second direction, the second light guide subsection is located at a side of the first light guide subsection away from the first backplane subsection, and a vertical projection of the first light guide subsection on a plane where the second backplane subsection is located overlaps a vertical projection of the first subsection on a plane where the second backplane subsection is located.

5. A backlight module according to claim 4, wherein the first light guide section has a thickness smaller than a thickness of the second light guide section along the first direction.

6. The backlight module according to claim 2, wherein the extension direction of the third backplate subsection intersects both the extension direction of the first backplate subsection and the extension direction of the second backplate subsection on a plane passing through the central axis.

7. The backlight module according to claim 6, wherein along the second direction, the light guide plate comprises a third light guide subsection and a fourth light guide subsection connected to each other, the fourth light guide subsection is located at a side of the third light guide subsection away from the first backplane subsection, and a vertical projection of the third light guide subsection on a plane where the second backplane subsection is located overlaps a vertical projection of the third backplane subsection on a plane where the second backplane subsection is located.

8. The backlight module as claimed in claim 7, wherein a side of the third light guide subsection adjacent to the third backplane subsection has a cut-out, and the third backplane subsection is not in contact with the third light guide subsection.

9. The backlight module as claimed in claim 6, wherein the reflective sheet comprises a first reflective subsection and a second reflective subsection, a perpendicular projection of the first reflective subsection on a plane where the second backplane subsection is located overlaps a perpendicular projection of the third backplane subsection on a plane where the second backplane subsection is located, and the second reflective subsection is located between the light guide plate and the second backplane subsection.

10. The backlight module as claimed in claim 2, wherein a reflective film is disposed on a side of the third back plate section adjacent to the light guide plate, the reflective film overlaps the reflective sheet, and a vertical projection of the reflective film and the reflective sheet on a plane of the second back plate section covers a vertical projection of the light guide plate on a plane of the second back plate section.

11. The backlight module as claimed in claim 1, wherein the thickness D of the back plate along the first direction is 0.05mm ≦ D ≦ 0.08 mm.

12. A liquid crystal display module comprising the backlight module of any one of claims 1-11;

the liquid crystal display module further comprises a liquid crystal display panel positioned on one side of the light-emitting surface of the backlight module.

13. A liquid crystal display device comprising the liquid crystal display module according to claim 12.

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