WO2019056719A1

WO2019056719A1 - Backlight module and liquid crystal display device

Info

Publication number: WO2019056719A1
Application number: PCT/CN2018/080212
Authority: WO
Inventors: 杨晓光; 马吉航
Original assignee: 青岛海信电器股份有限公司
Priority date: 2017-09-22
Filing date: 2018-03-23
Publication date: 2019-03-28
Also published as: CN109031747A; CN107479254A; CN109031747B

Abstract

A backlight module and a liquid crystal display device. A backplate (2) of the backlight module comprises a bottom plate (21), side plates (22), stepped bent parts (23) and lugs (81, 82), and has a strong structural strength. The backplate (2) can support various components, reduce thickness of the backlight module and the liquid crystal display device, and enable the liquid crystal display device to be frameless. The backlight module and the liquid crystal display device do not require front casing (05), thereby reducing production costs and production time for the front case (05), thereby reducing production cost, and improving production efficiency. The backplate (2) enables, by means of welding, that there is no seam between the side plates (22) and between the stepped bent parts (23), improving the hermeticity of the backlight module and the liquid crystal display device, thereby the service life of the two would not be influenced by infiltration of dust.

Description

Backlight module and liquid crystal display device

This application claims priority to Chinese Patent Application No. 200910865289.7, entitled "A Backplane, Backlight Module, and Liquid Crystal Display Device", filed on September 22, 2017, the entire contents of which are hereby incorporated by reference. Combined in this application.

Technical field

The present disclosure relates to the field of display technologies, and in particular, to a backlight module and a liquid crystal display device.

Background technique

At present, the existing liquid crystal display device mainly includes a liquid crystal panel and a backlight module that provides a display light source to the liquid crystal panel. The liquid crystal panel is usually fixed by a front case, thereby forming a bezel type liquid crystal display device and a frameless liquid crystal display device. As users' demands for visual experience have increased, borderless liquid crystal display devices have been gradually promoted.

Summary of the invention

In a first aspect, an embodiment of the present disclosure provides a backlight module, including a diaphragm, a light guide plate, and a backboard, the backboard including:

a bottom plate, a side plate located at an edge of the bottom plate, and a stepped bent portion located at a top of the side plate toward the interior of the backlight module;

The stepped bent portion includes a first stepped surface formed by bending a top portion of the side panel toward the inside of the backlight module, and a second stepped surface connected to the first stepped surface; wherein the first step The second step surface is lower than the first step surface;

The first step surface and the second step surface are connected by a first connecting plate;

The first step surface is for supporting a liquid crystal panel, and the second step surface is for supporting the diaphragm.

The second aspect,

An embodiment of the present disclosure provides a liquid crystal display device including a liquid crystal panel and a backlight module in the first aspect, the liquid crystal panel being located on a backplane in the backlight module.

The above general description and the following detailed description are intended to be illustrative and not restrictive.

DRAWINGS

The accompanying drawings, which are incorporated in the specification

In order to more clearly illustrate some embodiments of the present disclosure or the technical solutions in the related art, the drawings used in the embodiments or the related technical description will be briefly described below, and it will be apparent to those skilled in the art that Other drawings may also be obtained from these drawings without paying for creative labor.

1 is a schematic structural view of a frameless liquid crystal display device according to the related art;

2 is a schematic perspective view of a backplane according to some embodiments of the present disclosure;

3 is a cross-sectional view of A-A of FIG. 2 provided by some embodiments of the present disclosure;

4a is a schematic structural diagram of a first liquid crystal display device according to some embodiments of the present disclosure;

4b is a schematic structural diagram of the backlight module of FIG. 4a according to some embodiments of the present disclosure;

4c is a schematic longitudinal cross-sectional view of a second liquid crystal display device according to some embodiments of the present disclosure;

4d is a partially enlarged schematic structural view of a liquid crystal display device of FIG. 4c according to some embodiments of the present disclosure;

4e is a partially enlarged schematic structural view of a liquid crystal display device of FIG. 4c according to some embodiments of the present disclosure;

4f is a schematic cross-sectional view of a second liquid crystal display device according to some embodiments of the present disclosure;

4g is a partially enlarged schematic structural view of a liquid crystal display device of FIG. 4f according to some embodiments of the present disclosure;

FIG. 4h is a partially enlarged schematic structural view of the liquid crystal display device of FIG. 4f according to some embodiments of the present disclosure; FIG.

FIG. 5 is a schematic structural diagram of a first mounting ear according to some embodiments of the present disclosure;

FIG. 6 is a schematic structural diagram of a second mounting ear according to some embodiments of the present disclosure;

FIG. 7 is a schematic structural diagram of a backlight module according to some embodiments of the present disclosure;

FIG. 7b is a schematic structural diagram of a liquid crystal display device using the backlight module of FIG. 7a according to some embodiments of the present disclosure;

FIG. 8 is a schematic view showing a first enlarged structure of a backplane after being welded according to some embodiments of the present disclosure; FIG.

FIG. 9 is a schematic view showing a second enlarged structure of the back sheet after soldering according to some embodiments of the present disclosure.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. The following description refers to the same or similar elements in the different figures unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with aspects of the present disclosure as detailed in the appended claims.

The back plate is a bottom plate structure of the liquid crystal display device, and is mainly used for supporting components such as a light guide plate or a reflection sheet. In the related art, the liquid crystal display device further includes a front case.

1 is a schematic structural view of a frameless liquid crystal display device in the related art. As can be seen from FIG. 1, the liquid crystal display device includes a liquid crystal panel 01, a back plate 02, a diaphragm 03, a light guide plate 04, and a liquid crystal panel 01, a back plate 02, a diaphragm 03, a light guide plate 04, and a front case 05. The end of the diaphragm 03 is usually attached to the front case 05 by means of a hook. The back plate 02 is a bottom plate structure of the frameless liquid crystal display device, and is used to support other components such as the light guide plate 04. The front case 05 is a side structure of the frameless liquid crystal display device, and is used to support the end portions of the liquid crystal panel 01, the diaphragm 03, and the like. The end of the back plate 02 is disposed at the bottom of the front case 05, whereby the back plate 02 and the front case 05 cause the frameless liquid crystal display device to form a box-like semi-closed structure.

Some embodiments of the present disclosure provide a backlight module, so that support for components such as a light guide plate, a diaphragm, and a liquid crystal panel can be realized by the backlight module without additionally providing a front case.

As shown in FIGS. 2-9, some embodiments of the present disclosure provide a backlight module including a diaphragm 03, a light guide plate 02, and a back plate 2. The backboard 2 includes a bottom plate 21, side plates 22, and a stepped bent portion 23 facing the interior of the backlight module. The bottom plate 21 is for supporting the light guide plate 04, and the side plate 22 is located at an edge of the bottom plate 21 and perpendicular to the bottom plate 21, and the side plate 22 is for supporting the stepped bent portion 23.

In some embodiments of the present disclosure, as shown in FIGS. 3 to 4b, the stepped bent portion 23 is for supporting the liquid crystal panel 01 and the diaphragm 03. The side panels 22 are located at at least one side edge of the bottom panel 21, and in some embodiments are located around the bottom panel 21. Thereby, the bottom plate 21 and the side plates 22 enclose a cavity structure with an open top, that is, the cavity 5 in FIG. The stepped bent portion 23 is located at the top of the side plate 22. The stepped bent portion 23 includes a first stepped surface 231 formed by bending a top portion of the side plate 22 toward the cavity 5 (that is, toward the inside of the backlight module), and a second step connected to the first stepped surface 231 Face 233. The second step surface 233 is lower than the first step surface 231. The first stepped surface 231 and the second stepped surface 233 are connected by the first connecting plate 232, and the second stepped surface 233 is adjacent to the bottom plate 21. In some embodiments of the present disclosure, the first stepped surface 231 extends from the end of the side panel 22 away from the bottom plate 21 toward the interior of the backlight module and is parallel to the bottom plate 21, and the first connecting plate 232 is separated from the first stepped surface 231. One end of the side plate 22 extends toward the bottom plate 21 and is perpendicular to the first step surface 231 . The second step surface 233 extends from the end of the first connecting plate 232 away from the first step surface 231 toward the inside of the backlight module and is parallel to the bottom plate 21 . . The first step surface 231 is for supporting the liquid crystal panel 01, the second step surface 233 is for supporting the diaphragm 03, and the first connecting plate 232 is for limiting the diaphragm 03, thereby realizing the stepped bending portion 23 to the diaphragm. 03 and the support of the liquid crystal panel 01, please refer to FIG. 4a to FIG. 4b.

In some embodiments disclosed, there is no need to provide a light guide plate 04, but a diffuser plate for diffusing light from a light source on the bottom plate 21 is included in the diaphragm 03.

The bottom plate 21, the side plates 22, and the stepped bent portions 23 provided by some embodiments of the present disclosure may be formed by integral bending. The bending manner may be that the side portions of the bottom plate 21 are bent to form the side plates 22 located around the bottom plate 21, and the bottom plate 21 and the side plates 22 enclose a cavity structure with an open top. The bending from the top of the side plate 22 toward the cavity 5 is continued, thereby forming a stepped bent portion 23 having a two-layer structure including the first stepped surface 231 and the second stepped surface 233. The structural strength of the backing plate 2 is enhanced by the presence of the side plates 22 and the stepped bent portions 23. At the same time, the stepped bent portion 23 having a two-layer structure further strengthens the structural strength of the backing plate 2. Since the structural strength of the back sheet 2 is enhanced, the liquid crystal display device has a high structural strength. The stepped bent portion 23 can support the diaphragm 03 and the liquid crystal panel 01, and the side plate 22 is the outermost structure of the back sheet 2. Therefore, the back sheet can also serve as the outer side surface of the display device while supporting the diaphragm 03 and the liquid crystal panel 01. Since the side plate 22 and the bottom plate 21 are integrally formed, no light leakage occurs. In some embodiments of the present disclosure, the side panel 22 and the bottom panel 21 may be integrally formed by welding, and the side panel 22 and the stepped bent portion 23 may be integrally formed or may be integrally formed by welding. During the implementation, at least one integral piece including the side plate 22 and the stepped bent portion 23 may be formed by a process and then welded to the bottom plate.

A backlight module and a liquid crystal display device are specifically described in some embodiments of the present disclosure with reference to the accompanying drawings.

Please refer to Figures 2 and 3. 2 is a first perspective structural view of a back panel in a backlight module provided by some embodiments of the present disclosure, and FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, which is equivalent to viewing the drawing in the forward direction. 2 is a cross-sectional view in the horizontal direction of FIG. 2 . The back plate 2 includes a bottom plate 21, a side plate 22, and a stepped bent portion 23. The bottom plate 21 is for supporting the light guide plate 04, and the side plate 22 is for supporting the stepped bent portion 23 for supporting the liquid crystal panel 01 and the diaphragm 03. The back sheet 2 provided by some embodiments of the present disclosure may be formed by integral bending, that is, bending on the basis of the flat structure bottom plate 21 to form the side plates 22 located around the bottom plate 21. The side plates 22 continue to be bent to form a stepped bent portion 23. Since the side plates 22 are located around the bottom plate 21, the bottom plate 21 and the side plates 22 enclose a cavity structure with an open top, that is, the cavity 5 in FIG. The stepped bent portion 23 is located at the top of the side plate 22, and the stepped bent portion 23 is bent by the top of the side plate 22 toward the cavity 5 (ie, toward the inside of the backlight module) to form a first stepped surface 231. The second stepped surface 233 is formed by bending the end of the first stepped surface 231 toward the bottom plate 21. Since the stepped bent portion 23 is bent in the direction of the cavity 5 from the top of the side plate 22, the side plate 22 is formed in a form of a structure surrounding the stepped bent portion 23. At this time, the side plate 22 forms the outermost structure of the back plate 2, and the back plate 2 is a regular integrated planar structure as seen from the outer form.

In some embodiments of the present disclosure, the side plate 22 at one side or both side positions of the bottom plate 21 and the stepped bent portion 23 corresponding to the side plate 22 are separately formed, after the light guide plate 04 is placed, The separately formed side plates 22 and the stepped bent portions 23 corresponding to the side plates 22 are fixed to the bottom plate.

Since the gravity of the components such as the liquid crystal panel 01, the diaphragm 03, and the light guide plate 04 mainly acts on the bottom plate 21 and the side plate 22, when the angle between the bottom plate 21 and the side plate 22 is greater than 90°, the liquid crystal panel 01 and the like may A horizontal force parallel to the bottom plate 21 and a vertical force perpendicular to the bottom plate 21 are applied to the side plates 22. The side plate 22 is easily inclined toward the bottom plate 21 by the horizontal force and the vertical force, and finally the side plate 22 cannot support the stepped bent portion 23, and the back plate 2 is structurally collapsed. In order to prevent structural collapse of the backing plate 2, in some embodiments of the present disclosure, the side panels 22 are set to be perpendicular to the bottom panel 21 such that components such as the liquid crystal panel 01 apply only vertical forces perpendicular to the bottom panel 21 to the side panels 22.

In order to make the stepped bent portion 23 have a higher supporting strength, the components in the stepped bent portion 23 may be disposed in such a manner that the first stepped surface 231 and the second stepped surface 233 are parallel to each other, and the first connecting plate 232 It is perpendicular to the second stepped surface 233. At this time, the stepped structure of the stepwise bent portion 23 is more stable. Optionally, in order to provide the back plate 2 with a higher supporting strength, the first step surface 231 is parallel to the bottom plate 21, and the second step surface 233 is perpendicular to the side plate 22.

In some embodiments of the present disclosure, the stepped bend 23 includes a first stepped surface 231, a first web 232, and a second stepped surface 233. The first step surface 231 is for supporting the liquid crystal panel 01. The first connecting plate 232 is for connecting the first step surface 231 and the second step surface 233. The second step surface 233 is for supporting the diaphragm 03. Please refer to FIG. 3, FIG. 4a and FIG. 4b for details.

The liquid crystal panel 01 is a display member of a liquid crystal display device, and includes a plurality of members such as a polarizing plate, a glass substrate, and a liquid crystal material, and thus has a large weight. Further, since the end portion of the liquid crystal panel 01 is located at the first step 231, the intermediate portion of the liquid crystal panel 01 may be deformed due to a large weight. In order to enable the first stepped surface 231 to support the liquid crystal panel 01 and prevent the liquid crystal panel 01 from being deformed, the width h1 of the first stepped surface 231 should have a suitable width. The weight of the diaphragm 03 is small, and the second step surface 233 does not cause deformation when the diaphragm 03 is supported. Therefore, the width h2 of the second step surface 233 is sufficient to support the diaphragm 03. In the embodiment of the present disclosure, the width h1 of the first step surface 231 may be set to be 2-4 times, such as 2 times, 3 times, or the width h2 of the second step surface 233, based on the width h2 of the second step surface 233. 4 times or the like to satisfy the width requirement of the first step surface 231 supporting the liquid crystal panel 01 and the second step surface 233 supporting the diaphragm 03, respectively.

Since the second step surface 233 is for supporting the diaphragm 03, in order to allow the diaphragm 03 to be placed between the first step surface 231 and the second step surface 233, between the first step surface 231 and the second step surface 233 The pitch is greater than or equal to the thickness of the diaphragm 03. Illustratively: the spacing between the upper surface of the second stepped surface 233 and the lower surface of the first stepped surface 231 is greater than or equal to the thickness of the diaphragm 03. When other components are further provided between the liquid crystal panel 01 and the diaphragm 03, the interval between the first stepped surface 231 and the second stepped surface 233 is larger than the thickness of the diaphragm 03. When no other member is provided between the liquid crystal panel 01 and the diaphragm 03, the interval between the first stepped surface 231 and the second stepped surface 233 may be equal to the thickness of the diaphragm 03.

Further, the stepped bent portion 23 faces the inside of the display module with respect to the side plate 22 and occupies a certain space. If the distance between the stepped bent portion 23 and the bottom plate 21 is small, the light guide plate 04 is not suitable. Therefore, in order to provide the light guide plate 04 on the bottom plate 21, the distance between the second stepped surface 233 and the bottom plate 21 is greater than or It is equal to the thickness of the light guide plate 04. Illustratively, the spacing between the lower surface of the second stepped surface 233 and the upper surface of the bottom plate 21 is greater than or equal to the thickness of the light guide plate 04.

Please refer to Figures 4c to 4h. 4c and 4f are schematic cross-sectional views of a second liquid crystal display device according to some embodiments of the present disclosure in two directions. Fig. 4c is a schematic cross-sectional view showing a cross section taken along the sky side to the ground side of the liquid crystal display device (i.e., a schematic longitudinal sectional view of the liquid crystal display). 4d is a partially enlarged schematic view showing the B (day side) of the liquid crystal display device of FIG. 4c. 4e is a partially enlarged schematic view showing a portion C (ground side) of the liquid crystal display device of FIG. 4c. Fig. 4f is a schematic cross-sectional view (i.e., a schematic cross-sectional view of a liquid crystal display) taken along a direction perpendicular to the direction from the front side to the ground side of the liquid crystal display device. 4g is a partially enlarged schematic view showing a portion D of the liquid crystal display device of FIG. 4f. 4e is a partially enlarged schematic structural view of the liquid crystal display device of FIG. 4f. The side of the liquid crystal display device is the side of the liquid crystal display device on the upper side in the normal viewing state, and the ground side is the side of the liquid crystal display device on the lower side of the liquid crystal display device in the normal viewing state.

Referring to FIGS. 4c to 4e, the backboard 2 includes a bottom plate 21, side plates 22, and a bent portion 23. Specifically, as can be seen from FIG. 4d, at the sun side of the liquid crystal display device, the top of the side plate 22 is bent toward the inside of the backlight module to form a bent portion 23. The bent portion 23 is a stepped bent portion. The stepped bent portion 23 includes a first stepped surface 231 which is formed by bending the top of the side plate 22 toward the inside of the backlight module, and a second stepped surface 233 which is connected to the first stepped surface 231. The first stepped surface 231 and the second stepped surface 233 are connected by the first connecting plate 232, and the second stepped surface 233 is adjacent to the bottom plate 21. The first stepped surface 231 is for supporting the liquid crystal panel 01, the second stepped surface 233 is for supporting the diaphragm 03, and the diaphragm 03 is fixed by the mounting ears that are in the same plane as the first connecting plate 232.

As can be seen from Fig. 4e, at the ground side of the liquid crystal display device, the bent portion 23 is not provided. At this time, the side plate 22 is for supporting the liquid crystal panel 01, and the diaphragm 03 can be directly placed on the light guide plate 04. When the backlight module is assembled, the light guide plate 04 can be directly mounted into the back plate 2 from the side where the bent portion 23 is not provided, thereby saving assembly time of the backlight module.

Referring to FIGS. 4f to 4h, the backboard 2 includes a bottom plate 21, side plates 22, and a bent portion 23. As shown in FIG. 4g and FIG. 4h, the top of the side plate 22 is bent toward the inside of the backlight module to form a bent portion 23. The bent portion 23 is a stepped bent portion. The stepped bent portion 23 includes a first stepped surface 231 which is formed by bending the top of the side plate 22 toward the inside of the backlight module, and a second stepped surface 233 which is connected to the first stepped surface 231. Specifically, the first step surface 231 is for supporting the liquid crystal panel 01, and the second step surface 233 is for supporting the diaphragm 03.

In some embodiments of the present disclosure, the diaphragm 03 is fixed in a bolted or lug-mounted manner. When the diaphragm 03 is fixed by bolting, the bolt is fixed on the second step surface 233 or on the first connecting plate 232. When the diaphragm 03 is fixed by the hook mounting method, the position of the diaphragm 03 is set by the first connecting plate 232. That is, the first connecting plate 232 or the first stepped surface 231 and the first connecting plate 232 are provided with a hollow groove, and the second stepped surface 233 has a hanging ear, and the hanging ear is located in the empty groove. The case where the first connecting plate 232 and the joint between the first stepped surface 231 and the first connecting plate 232 are provided with empty grooves are respectively described in the following two specific embodiments.

Illustratively, please refer to FIG. 5, which shows a schematic structural view of a first mounting ear in some embodiments of the present disclosure. As can be seen from FIG. 5, a first recess 91 is provided at the junction between the first connecting plate 232 and the first stepped surface 231. The first stepped surface 81 of the fixed diaphragm 03 is disposed on the second stepped surface 233, and the first mounting lug 81 is located in the first recess 91. To reduce space occupation, the first mounting ears 81 are located on the same plane as the first connecting plate 232, and the first mounting ears 81 are located at the junction of the second stepped surface 233 and the first connecting plate 232. In order to prevent the diaphragm 03 from falling off the first mounting lug 81, the first lug 81 extends in the direction of the first stepped surface 231. At the same time, a gap is left between the top of the first lug 81 and the lower surface of the first stepped surface 231 so that the diaphragm 03 can be hung on the first lug 81. In order to hang the diaphragm 03 from the different orientations on the first mounting ears 81, a plurality of first recesses 91 are provided at the joint between the first connecting plate 232 and the first stepped surface 231. Correspondingly, a plurality of first lugs 81 are disposed on the first step surface 231.

Please refer to FIG. 6. FIG. 6 is a schematic structural view of a second mounting ear according to some embodiments of the present disclosure. As can be seen from FIG. 6, the first connecting plate 232 is provided with a second recess 92. The second step 233 is provided with a second mounting lug 82 for fixing the diaphragm 03, and the second mounting lug 82 is located in the second recess 92. To reduce space occupation, the second mounting ears 82 are located on the same plane as the first connecting plate 232, and the second mounting ears 82 are located at the junction of the second stepped surface 233 and the first connecting plate 232. Similarly, in order to prevent the diaphragm 03 from falling off the second lug 82, the second lug 82 extends in the direction of the first stepped surface 231. At the same time, a gap is left between the top of the second mounting lug 82 and the lower surface of the first stepped surface 231 so that the diaphragm 03 can be hung on the second lug 82. In order to hang the diaphragm 03 from the different orientations on the second mounting lug 82, the first connecting plate 232 is provided with a plurality of second recesses 92. Correspondingly, a plurality of second lugs 82 are disposed on the second step surface 233.

The foregoing embodiment is only two types of lug structures provided by some embodiments of the present disclosure. On the basis of the backboard 2 provided by some embodiments of the present disclosure, the rest of the method of suspending the diaphragm 03 by the stepped bent portion 23 is also It is within the scope of protection of the present disclosure. The mounting ear provided by some embodiments of the present disclosure is formed by stamping or shearing on the stepped bent portion 23, or pre-punching the shape of the mounting ear before the backing plate 2 is integrally bent, and then hanging The ear is formed by bending the second step surface 233 toward the first step surface 231. Since the method of forming the stepped bent portion 23 and forming the lug after punching has a large processing difficulty, the mounting ear can be formed by punching and bending in the embodiment of the present disclosure to shorten the processing time.

Referring to FIG. 7a and FIG. 7b, FIG. 7a is a schematic structural diagram of a backlight module according to some embodiments of the present disclosure. On the basis of the backplane of the backlight module provided by the above embodiments, some embodiments of the present disclosure provide a backplane of the backlight module, and the stepped bent portion 23 further includes a second connecting plate 234. The two ends of the second connecting plate 234 are respectively connected to the tops of the first stepped surface 231 and the side plate 22 to realize the connection of the side plate 22 and the stepped bent portion 23. The second connecting plate 234 is parallel to the side plate 22 and faces the bottom plate 21, so that the second connecting plate 234 is higher than the first stepped surface 231. When the second connecting plate 234 is connected to the top of the side plate 22, the connection of the second connecting plate 234 and the side plate 22 is curved or planar.

In the embodiment shown in Fig. 7a or Fig. 7b provided by the present disclosure, the backing plate 2 exhibits the structure of the bottom plate 21, the side plates 22, and the stepped bent portion 23 by integral bending. Specifically, the backing plate 2 is initially a flat planar structure, and the structural form of the bottom plate 21 and the side plates 22 is formed by the first bending. Preferably, the backing plate 2 is bent 90° for the first time. The side panel 22 continues to be bent to form the structure of the stepped bent portion 23. Compared with the prior art post-assembly assembly technology of the back plate 02 and the front case 05 in the related art, the back plate 2 provided by the embodiment of the present disclosure is formed by an integral bending method, which can significantly shorten the production time and improve the production efficiency.

In some embodiments of the present disclosure, the second connecting plate 234 may be stamped by the upper portion of the side plate 22 flipped 180° into the display module. The second web 234 can also be welded to the side panel 22 as a separate component.

In some embodiments, the end of the first stepped surface 231 away from the first connecting plate 232 may not be connected to the top end of the side plate 22, but may be connected to the side of the side plate 22 facing the inside of the display module. The connection position of the first stepped surface 231 and the side plate 22 has a predetermined distance from the top end of the side plate 22. Such a structural design facilitates the use of extrusion molding techniques, and of course, conventional welding can also be employed.

In addition, since the backing plate 2 is realized in an integral bending form, there is a gap between the adjacent two side plates 22 and the two stepped bent portions 23, so that dust or the like enters the inside of the backing plate 2. In order to avoid the occurrence of a gap, after the back plate 2 is integrally bent, the gap between the adjacent two side plates 22 and the adjacent two stepped bent portions 23 is eliminated by welding, thereby improving the overall back plate 2 Sex, closure and structural strength. As shown in Figs. 8 and 9, Figs. 8 and 9 are plan views of I in Fig. 2, and only the adjacent two stepped bent portions 23 are welded in a different structural form. Illustratively, after the two adjacent stepped bends 23 in FIG. 8 are welded, the welds of the two first stepped faces 231 assume a horizontal shape. After the welding of the adjacent two stepped bent portions 23 in Fig. 9, the welded portions of the two first stepped faces 231 assume a shape of an inversion of 45°.

In order to further increase the structural strength of the backboard 2 during use, the second stepped surface 233 may be positioned above the end of the light guide plate 04 such that the light guide plate 04 supports the stepped bent portion 23. The bottom plate 21, the side plates 22 and the stepped bends 23 form a semi-closed cavity structure, such as the semi-closed cavity 6 of Figure 4a. When the light guide plate 04 is disposed on the bottom plate 21, the light guide plate 04 is located in the semi-closed cavity 6. In order to prevent the light guide plate 04 from shaking in the semi-closed cavity 6, the end of the light guide plate 04 needs to be abutted against the side plate 22. In other embodiments, a silicone pad 7 is disposed between the bottom plate 21 and the second stepped surface 233. The silicone pad 7 can be fixed between the bottom plate 21 and the second step 233 by its elastic force, and the light guide plate 04 is placed on the silicone pad 7. On the inner side, the fixing of the light guide plate 04 is achieved.

Some embodiments of the present disclosure also provide a liquid crystal display device, which refers to FIGS. 4a and 7a, which includes a liquid crystal panel 01 and a back sheet 2 provided by some embodiments of the present disclosure. The liquid crystal panel 01 is disposed on the back plate 2. Specifically, the end portion of the liquid crystal panel 01 is disposed on the first stepped surface 231 by bonding or the like.

In the liquid crystal display device provided by the embodiment of the present disclosure, the back plate 2 serves as the outer casing and the supporting member of the liquid crystal display device, and it is not necessary to additionally manufacture the outer casing and the supporting member (corresponding to the front case 05 in the related art), thereby greatly saving liquid crystal. The production cost of the display device reduces the manufacturing cost of the liquid crystal display device. The diaphragm 03, the light guide plate 04, and the like are both disposed inside the back plate 2, and the liquid crystal panel 01 is located on the surface of the back plate 2, so that the liquid crystal display device has only a part of the side, that is, the side plate 22 as seen from the external form. Since the side panel 22 occupies only a small amount of space, the liquid crystal display device assumes a frameless structure.

In some implementations, due to process limitations, when the liquid crystal panel 01 is located on the surface of the first stepped surface 231 of the backing plate 2, there is a space 24 (such as FIG. 4a) or a gap 25 between the liquid crystal panel 01 and the side plate 22 (eg, Figure 7a). In order to eliminate the space or gap between the liquid crystal panel 01 and the side plate 22, the liquid crystal display device exhibits an integrated structure from the appearance, and the space or gap between the liquid crystal panel 01 and the side plate 22 is bonded by adhesive or curing adhesive. .

Other embodiments of the present disclosure will be readily apparent to those skilled in the <RTIgt; The present application is intended to cover any variations, uses, or adaptations of the present disclosure, which are in accordance with the general principles of the disclosure and include common general knowledge or common technical means in the art that are not disclosed in the present disclosure. . The specification and examples are to be regarded as illustrative only,

It should be understood that the expressions of "equal", "vertical", "parallel", and the like in the specification are not intended to be an absolute expression, and are intended to be included within the scope of the present disclosure.

It should be understood that relational terms such as "first" and "second" are used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply There is any such actual relationship or order between them. The present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the disclosure is to be limited only by the appended claims.

Claims

A backlight module includes a diaphragm, a light guide plate and a back plate, and the back plate includes:

Bottom plate

a side plate located at an edge of the bottom plate, and a stepped bent portion at the top of the side plate toward the inside of the backlight module;

The stepped bent portion includes a first stepped surface formed by bending a top portion of the side panel toward the inside of the backlight module, and a second stepped surface connected to the first stepped surface; wherein the first step The second step surface is lower than the first step surface;

The first step surface and the second step surface are connected by a first connecting plate;

The first step surface is for supporting a liquid crystal panel, and the second step surface is for supporting the diaphragm.
The backlight module of claim 1 , wherein the first connecting plate or the connection between the first stepped surface and the first connecting plate is provided with a hollow slot;

The second step surface has a mounting ear, and the mounting ear is located in the empty slot;

The mounting ear extends toward the first step surface;

A gap is left between the top of the mounting ear and the lower surface of the first stepped surface.
The backlight module of claim 1, wherein the mounting lug is bent from the second step toward the first step.
The backlight module of claim 1, wherein the side plate is perpendicular to the bottom plate, and the first step surface is parallel to the second step surface.
The backlight module of claim 4, wherein the first connecting plate is perpendicular to the second stepped surface, and the second stepped surface is parallel to the bottom plate.
The backlight module according to any one of claims 1 to 4, wherein the stepped bent portion further comprises a second connecting plate;

Two ends of the second connecting plate are respectively connected to the first step surface and the top of the side plate;

The second connecting plate is parallel to the side plate;

The height of the second connecting plate is greater than or equal to the thickness of the liquid crystal panel.
The backlight module of claim 6, wherein two adjacent ones of the side plates on different sides of the display device are connected by soldering, and two adjacent first step surfaces on different side plates are Connected by welding.
The backlight module of claim 1 , wherein the first step width is 2-4 times the width of the second step;

a spacing between the first step and the second step is greater than or equal to a thickness of the diaphragm;

The spacing between the second step and the bottom plate is greater than or equal to the thickness of the light guide plate.
The backlight module according to claim 1, wherein the bottom plate, the side plate, and the stepped bent portion are integrally bent and formed.
A liquid crystal display device comprising a liquid crystal panel and the backlight module according to any one of claims 1 to 9, the liquid crystal panel being located on a backplane in the backlight module.