Backlight module and display device

Abstract

The utility model discloses a backlight module and a display device, and the backlight module comprises a back plate which comprises a first back plate part and a second back plate part which are opposite to each other in a first direction; the first light source assembly is movably arranged on the first back plate part in the first direction; the second light source assembly is arranged on the second back plate part; the light guide plate comprises a first light guide end and a second light guide end which are opposite in the first direction, the light guide plate is arranged on the back plate, the first light guide end abuts against the first light source assembly, and the second light guide end abuts against the second light source assembly. According to the backlight module, light enters from the two sides, so that the brightness of the backlight module can be improved; when the light guide plate expands and contracts, the first light source assembly synchronously moves along with the light guide plate, so that the first light source assembly can be prevented from blocking the light guide plate to cause wrinkles of the light guide plate, and the defects of low light efficiency and poor brightness uniformity caused by overlarge or changed gap between the light guide plate and the first light source assembly can be overcome.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and in particular relates to a backlight module and a display device. Background Art

[0002] With the development of market demand, higher requirements are constantly being put forward for the brightness and uniformity of display devices. In the related art, the backlight source (LED Bar) in the backlight module (Back Light Unit, BLU) is fixed to one end of the back cover through a heat sink. At the same time, the light guide plate (LGP) is arranged on the back cover. Since the light guide plate expands due to heat, it is necessary to reserve an expansion gap (GAP) of the light guide plate in the backlight module to avoid wrinkles caused by the limited expansion of the light guide plate. Generally, the expansion gap is reserved at the other end of the back plate, that is, one end of the backlight plate is the fixed side of the light guide plate, and the other end is the expansion side of the light guide plate. However, when the backlight source (LED Bar) is added to the expansion side of the light guide plate to increase the brightness of the backlight module, the gap between the light guide plate and the added backlight source is uncontrollable due to the expansion of the light guide plate, resulting in unstable uniformity of the brightness of the backlight module, which limits the application of display devices in medical and other fields.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The present application aims to solve the technical problem of unstable brightness uniformity of a backlight module at least to a certain extent. To this end, the present application provides a backlight module and a display device.

[0005] An embodiment of the present application provides a backlight module, the backlight module comprising:

[0006] A back plate, the back plate comprising a first back plate portion and a second back plate portion opposite to each other in a first direction;

[0007] A first light source assembly, wherein the first light source assembly is movably disposed on the first back plate portion in the first direction;

[0008] A second light source assembly, the second light source assembly is disposed on the second back plate portion; and

[0009] A light guide plate, the light guide plate comprising a first light guide end and a second light guide end opposite to each other in the first direction, the light guide plate being arranged on the back plate, the first light guide end abutting against the first light source assembly so that the first light source assembly can move following the first light guide end, and the second light guide end abutting against the second light source assembly.

[0010] In some embodiments, the first light source assembly includes:

[0011] A first heat sink, the first heat sink comprising a first mounting portion and a first folded edge perpendicular to the first mounting portion;

[0012] A first backlight source, the first backlight source is arranged at the first folded edge; and

[0013] A first connecting component is connected to the first mounting portion and the back plate respectively, so that the first mounting portion can move relative to the first back plate portion in the first direction.

[0014] In some embodiments, the first mounting portion defines a runway-shaped movable groove extending along the first direction; the first connecting component includes a first connecting member and a first elastic member, the first connecting member is disposed in the runway-shaped movable groove and is connected to the back plate; the first elastic member is disposed in the runway-shaped movable groove and abuts against the first connecting member at least in the first direction.

[0015] In some embodiments, the first elastic member is sleeved on the first connecting member.

[0016] In some embodiments, the back panel also includes a back panel folded edge, which is arranged on the first back panel portion and perpendicular to the first back panel portion; the first light source assembly also includes a second elastic member, the end of the second elastic member away from the second back panel portion abuts on the back panel folded edge, the end of the second elastic member adjacent to the second back panel portion abuts on the first heat sink, and the compressibility of the second elastic member in the first direction is greater than the expansion deformation of the light guide plate.

[0017] In some embodiments, the first mounting portion is provided with a receiving groove; the back panel folded edge and the second elastic member are both located in the receiving groove.

[0018] In some embodiments, the first light source assembly further includes:

[0019] A first stopper is disposed on the first backlight source to abut against the first light guide end.

[0020] In some embodiments, the first stopper is a patch-type stopper.

[0021] In some embodiments, the second light source assembly includes:

[0022] A second heat sink, the second heat sink comprising a second mounting portion and a second folded edge perpendicular to the second mounting portion;

[0023] a second backlight source, the second backlight source being arranged at the second folded edge;

[0024] a second connecting component, the second connecting component is connected to the second mounting portion and the back plate respectively, so that the second mounting portion is fixed relative to the second back plate portion in the first direction; and

[0025] A second stopper is disposed on the second backlight source to abut against the second light guide end.

[0026] In some embodiments, the light guide plate includes a third light guide end and a fourth light guide end opposite to each other in a second direction; the back plate is provided with a third stopper and a fourth stopper opposite to each other in the second direction, the third stopper abuts against the third light guide end, and the fourth stopper abuts against the fourth light guide end; the second direction is perpendicular to the first direction.

[0027] In some embodiments, the backlight module further includes:

[0028] The rubber frame includes an annular rubber frame portion surrounding the back plate and a rubber frame limiting portion connected to the annular rubber frame portion, the rubber frame limiting portion is located on a side of the light guide plate away from the back plate, the rubber frame limiting portion abuts against the light guide plate in a third direction, and the third direction is perpendicular to both the first direction and the second direction.

[0029] In some embodiments, the backlight module further includes:

[0030] A dustproof part, wherein the dustproof part is located between the rubber frame limiting part and the light guide plate, and the dustproof part, the rubber frame limiting part and the light guide plate are all interference fit.

[0031] The embodiment of the present disclosure also provides a display device, which includes a display panel and the above-mentioned backlight module, wherein the display panel is located on a side of the light guide plate away from the back plate. The embodiment of the present application has at least the following beneficial effects:

[0032] The above-mentioned backlight module includes a first light source assembly and a second light source assembly, and the first light source assembly and the second light source assembly are arranged on the back panel opposite to each other in a first direction. The brightness of the backlight module can be improved by entering light from both sides. At the same time, the first light source assembly is movably arranged on the first back panel portion in the first direction, and the first light guide end of the light guide plate abuts against the first light source assembly so that the first light source assembly can move with the first light guide end. When the light guide plate expands or contracts, the first light source assembly can move synchronously with the light guide plate, which can avoid the first light source assembly blocking the light guide plate and causing wrinkles on the light guide plate, and can also avoid the defects of low light efficiency and poor brightness uniformity caused by the gap between the light guide plate and the first light source assembly being too large or changing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A simplified structural diagram of a backlight module in an embodiment of the present application is shown;

[0035] Figure 2 An exploded view (partial) of a display device in an embodiment of the present application is shown;

[0036] Figure 3 A schematic diagram of the structure of the first light source assembly of the back panel module in an embodiment of the present application is shown;

[0037] Figure 4 Shows Figure 3 A schematic diagram of the structure of the first connecting component and the first backlight source;

[0038] Figure 5 Shows Figure 4 A cross-sectional view of the first connecting component in a first direction;

[0039] Figure 6 Shows Figure 4 A cross-sectional view of the first connecting component in the second direction;

[0040] Figure 7 Shows Figure 3 A schematic diagram of the structure of the second elastic member;

[0041] Figure 8 Shows Figure 7 A cross-sectional view of the second elastic member in the first direction;

[0042] Fig. 9 Shows Figure 3 A structural schematic diagram of the first light source assembly;

[0043] Fig.10 Shows Figure 3 A cross-sectional view of the plastic frame of the middle backlight module in the second direction;

[0044] Fig.11 Shows Figure 3 A cross-sectional view of the plastic frame of the middle backlight module in the first direction.

[0045] Reference numerals:

[0046] 100, back plate; 110, back plate folding edge; 111, back plate flange; 210, first heat sink; 211, first mounting portion; 212, first folding edge; 213, racetrack-shaped movable groove; 214, accommodating groove; 220, first backlight source; 221, first circuit board; 222, first sub-light source; 230, first connecting component; 231, first connecting member; 232, first elastic member; 240, second elastic member; 241, interference fit amount; 25 0, first stopper; 260, auxiliary reflector; 261, fixing member; 310, second heat sink; 311, second mounting portion; 312, second folding edge; 320, second backlight source; 400, light guide plate; 500, rubber frame; 510, annular rubber frame portion; 520, rubber frame limiting portion; 600, dustproof member; 700, optical film layer group; 800, middle frame; 900, front frame; 1000, display panel; F1, first direction; F2, second direction. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0048] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0049] For the sake of convenience and simplicity, in the backlight module disclosed in the present invention, the light guide plate 400 is used as a reference, the first direction F1 is a direction parallel to the light guide plate 400 and provided with a backlight source; the second direction F2 is a direction parallel to the light guide plate 400 and perpendicular to the first direction F1; the third direction is a direction perpendicular to the light guide plate 400, and at the same time, the third direction is also perpendicular to the first direction F1 and the second direction F2, that is, the thickness direction of the backlight module. The present application is described below in conjunction with the accompanying drawings and with reference to specific embodiments:

[0050] With the development of market demand, higher requirements are constantly being placed on the brightness and uniformity of display devices. For example, affected by the epidemic situation at home and abroad in recent years, people have become more aware of the importance of life and health, and at the same time, it has also promoted the advancement of technology in the global medical industry. Major medical institutions also have higher requirements for the characteristics of medical display screens. Medical display screens are different from display screens such as personal computers. Medical display screens have higher requirements for performance such as brightness and uniformity. This is because the lesions on medical diagnostic images are generally not very obvious, and slight differences will affect the doctor's judgment, resulting in many conditions requiring consultation by multiple doctors to draw conclusions. Therefore, how to improve the brightness and uniformity of the display screen to prevent doctors from misdiagnosing during surgery due to slight differences in images has become a key technology for medical display screens.

[0051] In the related art, the backlight source in the backlight module is fixed to one end of the back plate 100 through a heat sink, and the light guide plate 400 is arranged on the back plate 100. Since the light guide plate 400 expands due to heat, it is necessary to reserve an expansion gap for the light guide plate 400 in the backlight module to avoid wrinkles caused by the limited expansion of the light guide plate 400. Generally, the expansion gap is reserved at the other end of the back plate 100, that is, one end of the backlight plate is the fixed side of the light guide plate 400, and the other end is the expansion side of the light guide plate 400. However, when the backlight source is added to the expansion side of the light guide plate 400 to improve the brightness of the backlight module, the gap between the light guide plate 400 and the added backlight source is uncontrollable due to the expansion of the light guide plate 400, resulting in unstable uniformity of brightness of the backlight module, which limits the application of the display device in medical and other fields.

[0052] In order to solve the technical problem of unstable brightness uniformity of a backlight module, the embodiment of the present disclosure proposes a backlight module, such as Figures 1 to 10 As shown, the backlight module includes a back plate 100, a first light source assembly, a second light source assembly and a light guide plate 400. The back plate 100 includes a first back plate portion and a second back plate portion opposite to each other in a first direction F1; the first light source assembly is movably disposed on the first back plate portion in the first direction F1; the second light source assembly is disposed on the second back plate portion; the light guide plate 400 includes a first light guide end and a second light guide end opposite to each other in the first direction F1, the light guide plate 400 is disposed on the back plate 100, the first light guide end abuts against the first light source assembly so that the first light source assembly can move with the first light guide end, and the second light guide end abuts against the second light source assembly.

[0053] The backlight module proposed in the embodiment of the present disclosure is as follows: Figures 1 to 10As shown, the backlight module includes a first light source assembly and a second light source assembly, and the first light source assembly and the second light source assembly are arranged on the back panel 100 relative to each other in a first direction F1. The brightness of the backlight module can be improved by entering light from both sides; at the same time, the first light source assembly is movably arranged on the first back panel portion in the first direction F1, and the first light guide end of the light guide plate 400 abuts against the first light source assembly so that the first light source assembly can move with the first light guide end. When the light guide plate 400 expands or contracts, the first light source assembly can move synchronously with the light guide plate 400, which can avoid the first light source assembly blocking the light guide plate 400 and causing wrinkles in the light guide plate 400, and can also avoid the defects of low light efficiency and poor brightness uniformity caused by the gap between the light guide plate 400 and the first light source assembly being too large or changing.

[0054] In the related art, the backlight module is only provided with a single-side light source component, the brightness of the backlight module can only reach 350 nit (tpy), and the brightness uniformity standard is only 75%.

[0055] In some embodiments of the present disclosure, by setting a first light source assembly and a second light source assembly in the backlight module, the brightness of the backlight module can reach 850 nit (tpy). Compared with the backlight module of the related art, the brightness of the backlight module proposed in the embodiments of the present disclosure is significantly improved.

[0056] In some embodiments of the present disclosure, Figures 1 to 10 As shown, by arranging the first light source assembly and the second light source assembly in the backlight module, and by making the first light source assembly movably arranged on the back panel 100, the gap between the first light source assembly and the light guide plate 400 can be adaptively adjusted when the light guide plate 400 expands or contracts, so that the brightness uniformity of the display device using the backlight module can reach 85% (9 points). Compared with the backlight module of the related art, the brightness uniformity of the backlight module proposed in the embodiment of the present disclosure is significantly improved.

[0057] In some embodiments of the present disclosure, the first light source assembly and the second light source assembly are relatively arranged on the first back plate portion and the second back plate portion of the back plate 100, and the first back plate portion and the second back plate portion can be located on the top and bottom sides of the display device, that is, the first light source assembly and the second light source assembly are respectively located on the top and bottom sides of the display device, so that the backlight module can achieve light input from the top and bottom sides. For example, the first light source assembly is located on the top side of the display device, and the second light source assembly is located on the bottom side of the display device.

[0058] In some embodiments of the present disclosure, the light guide plate 400 can be made of polymethyl methacrylate (PMMA) and / or polycarbonate (PC). When the light guide plate 400 expands, when the first light guide end moves relative to the first back panel portion, since the first light guide end abuts against the first light source assembly, it can drive the first light source assembly to move synchronously, so that the distance between the first light guide end and the first light source assembly remains stable, thereby improving the brightness uniformity of the backlight module and keeping the brightness uniformity stable.

[0059] In some embodiments of the present disclosure, the second light source assembly is disposed on the second back panel portion. The second light source assembly may be fixedly disposed on the second back panel portion. In the following embodiments of the present disclosure, the backlight module of the present disclosure is exemplified by taking the second light source assembly fixedly disposed on the second back panel portion as an example.

[0060] In some other embodiments of the present disclosure, the second light source assembly may also be movably disposed on the second back panel portion. When the second light source assembly is movably disposed on the second back panel portion, the arrangement of the second light source assembly may refer to the first light source assembly and will not be repeated here.

[0061] In some other embodiments of the present disclosure, the back panel 100 includes a third back panel portion and a fourth back panel portion that are opposite to each other in the second direction F2, and the backlight module may further include a third light source assembly and / or a fourth light source assembly, the third light source assembly may be movably or immovably disposed on the third back panel portion in the second direction F2, and the fourth light source assembly may be movably or immovably disposed on the fourth back panel portion in the second direction F2. The arrangement of the third light source assembly and the fourth light source assembly may refer to the first light source assembly and / or the second light source assembly, and will not be repeated here.

[0062] As an optional implementation, Figures 1 to 8 The first light source assembly shown includes a first heat sink 210, a first backlight source 220 and a first connecting assembly 230. The first heat sink 210 includes a first mounting portion 211 and a first folded edge 212 perpendicular to the first mounting portion 211; the first backlight source 220 is arranged on the first folded edge 212; the first connecting assembly 230 is respectively connected to the first mounting portion 211 and the back panel 100, so that the first mounting portion 211 can move relative to the first back panel portion in a first direction F1.

[0063] In some embodiments of the present disclosure, Figures 1 to 8As shown, the first heat sink 210 is generally a metal sheet with thermal conductivity such as an aluminum sheet, for example, the first heat sink 210 can be made of 6063 aluminum extrusion material. The first backlight source 220 is fixed on the first heat sink 210, and the heat of the first backlight source 220 is dissipated through the thermal conductivity of the first heat sink 210.

[0064] In some embodiments of the present disclosure, Figures 1 to 8 As shown, the first heat sink 210 includes a first mounting portion 211 and a first folded edge 212 perpendicular to the first mounting portion 211 , the first mounting portion 211 is used to be mounted on the first back panel portion, and the first folded edge 212 is used to mount the first backlight source 220 so that the first backlight source 220 is located at the first end of the back panel 100 .

[0065] In some embodiments of the present disclosure, Figure 1 As shown, an auxiliary light-emitting panel 260 is provided on the first folded edge, and the auxiliary reflector 260 is fixed to the first folded edge 212 by a fixing member 261, so that the auxiliary reflector 260 is located between the first backlight source 220 and the first folded edge 212, and is used to assist in reflecting the light of the first backlight source 220, thereby improving the light efficiency of the first backlight source 220.

[0066] In some embodiments of the present disclosure, Figures 1 to 8 As shown, optionally, the first light guiding end of the light guide plate 400 may abut against the first backlight source 220 and / or the first folded edge 212 .

[0067] In some embodiments of the present disclosure, Figures 1 to 8 As shown, the first backlight source 220 may be a light bar, that is, the first backlight source 220 may include a first circuit board 221 and a plurality of first sub-light sources 222 arranged on the first circuit board 221, and the plurality of first sub-light sources 222 are arranged in a straight line on the first circuit board 221 along the second direction F2.

[0068] In some embodiments of the present disclosure, optionally, the first sub-light source 222 may be a light-emitting diode (LED) or an electroluminescent sheet (EL).

[0069] In the related art, the heat sink is generally fixed to the back plate by screws, and the heat sink is in a locked state, that is, the backlight source is fixed to one end of the back plate; at the same time, the light guide plate reserves a larger expansion gap at the other end of the back plate to allow the heat conduction plate to expand and contract. If the backlight source is fixed at both opposite ends of the back plate, then at the end of the light guide plate where the expansion gap is reserved, the distance between the light guide plate and the backlight source changes with the expansion and contraction of the light guide plate, that is, when the light guide plate expands and contracts, the distance between the end of the light guide plate where the expansion gap is reserved and the backlight source changes, and a larger gap is generated between the light guide plate and the backlight source, resulting in reduced light efficiency, and the brightness uniformity is unstable during the lighting process, resulting in a defect of poor brightness uniformity.

[0070] In some embodiments of the present disclosure, Figures 1 to 6 As shown, the first connecting component 230 is connected to the first mounting portion 211 and the back plate 100 respectively, so that the first mounting portion 211 is connected to the first back plate portion, and the first mounting portion 211 can move relative to the first back plate portion in the first direction F1, even if the first backlight source 220 can move relative to the first back plate portion in the first direction F1. When the light guide plate 400 expands, when the first light guide end moves relative to the first back plate portion, since the first light guide end abuts against the first light source assembly, it can drive the first light source assembly to move synchronously, that is, the gap between the first light guide end and the first backlight source 220 remains fixed, which can avoid the defects of light leakage and reduced light efficiency caused by the gap between the first light guide end and the first backlight source 220 being too large, thereby improving the brightness uniformity of the backlight module and keeping the brightness uniformity stable.

[0071] As an optional implementation, Figures 1 to 6 As shown, the first mounting portion 211 defines a runway-shaped movable groove 213 extending along the first direction F1; the first connecting component 230 includes a first connecting member 231 and a first elastic member 232, the first connecting member 231 is disposed in the runway-shaped movable groove 213 and is connected to the back plate 100; the first elastic member 232 is disposed in the runway-shaped movable groove 213 and abuts against the first connecting member 231 at least in the first direction F1.

[0072] In some embodiments of the present disclosure, Figures 1 to 6As shown, the first mounting portion 211 is provided with a runway-shaped movable groove 213 extending along the first direction F1. The first connecting member 231 is disposed in the runway-shaped movable groove 213 and connected to the back plate 100, so that the first mounting portion 211 can be fixed relative to the first back plate portion in the second direction F2, and the first mounting portion 211 can have a certain movement space in the first direction F1. When the light guide plate 400 expands, the light guide plate 400 can push the first heat sink 210 to move in the first direction F1. At the same time, the first elastic member 232 is arranged in the runway-shaped movable groove 213 and abuts against the first connecting member 231 at least in the first direction F1. The first elastic member 232 produces elastic deformation in the first direction F1. The first elastic member 232 can provide an elastic force in the first direction F1 for the first mounting portion 211 / the first heat sink 210. The elastic force applied by the first elastic member 232 to the first heat sink 210 is opposite to the force applied to the first heat sink 210 by the thermal expansion of the light guide plate 400. Therefore, the first elastic member 232 can keep the first heat sink 210 and the light guide plate 400 in an abutting state, thereby avoiding changes in the distance between the first heat sink 210 and the light guide plate 400.

[0073] In some embodiments of the present disclosure, Figures 1 to 6 As shown, the first connecting member 231 may be a screw, which is located in the racetrack-shaped movable groove 213 and connected to the first back plate portion.

[0074] As an optional implementation, Figures 1 to 5 As shown, the first elastic member 232 is sleeved on the first connecting member 231 .

[0075] In some embodiments of the present disclosure, Figures 1 to 6 As shown, the first elastic member 232 is sleeved on the first connecting member 231 , that is, the first elastic member 232 may be an elastic gasket, which is elastic. After the light guide plate 400 expands due to heat, the light guide plate 400 may drive the first heat sink 210 to move.

[0076] As an optional implementation, Figures 1 to 8 As shown, the back panel 100 also includes a back panel folded edge 110, which is arranged on the first back panel portion and perpendicular to the first back panel portion; the first light source assembly also includes a second elastic member 240, and the end of the second elastic member 240 away from the second back panel portion abuts on the back panel folded edge 110, and the end of the second elastic member 240 adjacent to the second back panel portion abuts on the first heat sink 210, and the compressible amount of the second elastic member 240 in the first direction F1 is greater than the expansion deformation amount of the light guide plate 400.

[0077] In some embodiments of the present disclosure, Figures 1 to 8As shown, the back panel folded edge 110 is arranged on the first back panel portion and is perpendicular to the first back panel portion. By making the end of the second elastic member 240 away from the second back panel portion abut against the back panel folded edge 110, the end of the second elastic member 240 adjacent to the second back panel portion abuts against the first heat sink 210. After the second elastic member 240 is compressed, the second elastic member 240 can generate an elastic force applied to the first heat sink 210, and since the back panel folded edge 110 is fixed relative to the back panel 100, the force applied by the second elastic member 240 to the first heat sink 210 is compressed toward the second back panel portion, that is, the elastic force applied by the second elastic member 240 to the first heat sink 210 is opposite to the direction of the force applied to the first heat sink 210 by the heat expansion of the light guide plate 400, so that the second elastic member 240 can ensure that the first heat sink 210 and the light guide plate 400 remain in abutment, thereby avoiding changes in the distance between the first heat sink 210 and the light guide plate 400. At the same time, when the expansion deformation caused by the heat expansion of the light guide plate 400 causes the first light guide end to move in the first direction F1, the compressible amount generated by the compression of the second elastic member 240 is greater than the expansion deformation generated by the light guide plate 400, so that the first light guide end has sufficient space to move, thereby preventing the second elastic member 240 and the first heat sink 210 from being unable to generate sufficient movement to avoid the first light guide end, thereby preventing the expansion gap of the first light guide end from being limited, causing the light guide plate 400 to produce wrinkles and affecting the light guiding effect.

[0078] In some embodiments of the present disclosure, the material of the second elastic member 240 may be rubber and / or silicone, that is, the second elastic member 240 may be a rubber block or a silicone block.

[0079] In some embodiments of the present disclosure, Figures 1 to 8 As shown, the second elastic member 240 is interference-fitted with the back plate folded edge 110 and the first heat sink 210 to ensure that the second elastic member 240 can always have an elastic force acting on the first heat sink 210 .

[0080] For example, taking a 55-inch backlight module as an example, the length of the second elastic member 240 in the first direction F1 can be 10 mm, and the second elastic member 240 has an interference fit of 1 mm with the back panel folded edge 110 and the first heat sink 210, that is, the second elastic member 240 abuts against the receiving groove of the first heat sink 210, and compression is generated here to produce an interference fit amount 241. The compression ratio of the second elastic member 240 is 90%, and the compressible amount of the second elastic member 240 is 9 mm. Since the second elastic member 240 has an interference fit of 1 mm with the back panel folded edge 110 and the first heat sink 210, under the limitation of the second elastic member 240, the movable distance of the first heat sink 210 in the first direction F1 is 8 mm. The expansion deformation of the light guide plate 400 due to thermal expansion is (60-25)×8×10-5×695.3mm+0.2383×(1.675-0.3)×695.3×0.01=1.95mm+2.278mm=4.228mm. The compressible amount of the second elastic member 240 and the movable distance of the first heat sink 210 are both greater than the expansion deformation of the light guide plate 400.

[0081] In some embodiments of the present disclosure, the back panel fold 110 may be located at the edge of the first back panel portion, the first fold 212 is opposite to the back panel fold 110 on the side away from the first backlight source 220, and the second elastic member 240 is located between the back panel fold 110 and the first fold 212.

[0082] As an optional implementation, Figures 1 to 8 As shown, the first mounting portion 211 defines a receiving groove 214 ; the back panel folded edge 110 and the second elastic member 240 are both located in the receiving groove 214 .

[0083] In some embodiments of the present disclosure, Figures 1 to 8 As shown, the first mounting portion 211 is provided with a receiving groove 214, the back panel folding edge 110 and the second elastic member 240 are both located in the receiving groove 214, and the second elastic member 240 is located on the side of the back panel folding edge 110 adjacent to the second back panel portion, so that the second elastic member 240 is supported by the back panel folding edge 110 and abuts against the edge of the receiving groove 214 on the first mounting portion 211, so as to apply an elastic force toward the second back panel portion to the first mounting portion 211 / first heat sink 210. The elastic force applied by the second elastic member 240 to the first heat sink 210 is opposite to the direction of the force applied to the first heat sink 210 by the thermal expansion of the light guide plate 400. When the light guide plate 400 expands and contracts, the second elastic member 240 can keep the first heat sink 210 and the light guide plate 400 in abutment, so that the gap between the first backlight source 220 and the light guide plate 400 remains constant, thereby making the brightness uniformity of the backlight module stable.

[0084] In some embodiments of the present disclosure, Figures 1 to 8As shown, the back plate folding edge 110 is provided with a back plate flange 111 opposite to the first back plate portion, and the back plate flange 111 can limit the second elastic member 240 in the third direction, so that the second elastic member 240 is located between the first back plate portion and the back plate flange 111, so as to prevent the second elastic member 240 from being squeezed and falling out of the accommodating groove 214. In some embodiments of the present disclosure, the edge of the accommodating groove 214 abutting against the second elastic member 240 can be provided with an accommodating baffle, and the contact area with the second elastic member 240 is increased by the accommodating baffle.

[0085] As an optional implementation, Figure 4 and Fig. 9 As shown, the first light source assembly further includes a first stopper 250 , and the first stopper 250 is disposed on the first backlight source 220 to abut against the first light guide end.

[0086] In some embodiments of the present disclosure, as described above, the first backlight source 220 may be a light bar, that is, the first backlight source 220 may include a first circuit board 221 and a plurality of first sub-light sources 222 disposed on the first circuit board 221, and the plurality of first sub-light sources 222 are arranged in a straight line on the first circuit board 221 along the second direction F2.

[0087] In some embodiments of the present disclosure, Figure 4 and Fig. 9 As shown, the first light source assembly also includes a first stopper 250, which is disposed on the first backlight source 220. The first stopper 250 is used to abut against the first light guide end, thereby preventing the first light guide end of the light guide plate 400 from directly abutting against the first circuit board 221 or the first sub-light source 222. On the one hand, it can prevent the first circuit board 221 from being crushed and damaged by the first light guide end, and on the other hand, it can prevent the heat generated by the direct contact between the first sub-light source 222 and the light guide plate 400 from causing the light guide plate 400 to melt due to the heat.

[0088] As an optional implementation, Figure 4 and Fig. 9 As shown, the first stopper 250 is a patch type stopper.

[0089] In the related art, the stopper is generally formed on the backlight source by welding, so the size of the stopper is generally small. For example, the size of the abutting surface of the stopper for abutting against the light guide plate is 2 mm×3 mm.

[0090] In some embodiments of the present disclosure, Figure 4 and Fig. 9As shown, the first stopper 250 can be a patch-type stopper, that is, the first stopper 250 can be attached to the first circuit board 221. The first stopper 250 is formed on the first circuit board 221 in an attached manner. Therefore, the size of the surface of the first stopper 250 used to abut against the light guide plate 400 is not affected by factors such as welding, and the size of the first stopper 250 can be appropriately increased. For example, the area of ​​the abutting surface of the first stopper 250 used to abut against the light guide plate 400 can be 15.6mm×7.7mm. The first stopper 250 is used to withstand the thrust generated by the expansion of the light guide end on the first light guide end. By increasing the area of ​​the abutting surface of the first stopper 250 abutting against the light guide plate 400, the pressure generated by the expansion of the first light guide end of the light guide plate 400 on the first stopper 250 can be improved, and the problem that the first stopper 250 is easy to fall off from the first circuit board 221 after being squeezed can be avoided to a certain extent.

[0091] In some embodiments of the present disclosure, the first stopper 250 may be made of polymethyl methacrylate (PMMA) and / or polycarbonate (PC) material.

[0092] As an optional implementation, Figure 1 As shown, the second light source assembly includes a second heat sink 310, a second light source assembly, a second connecting assembly and a second stopper, the second heat sink 310 includes a second mounting portion 311 and a second folded edge 312 perpendicular to the second mounting portion 311; the second backlight source 320 is arranged on the second folded edge 312; the second connecting assembly is respectively connected to the second mounting portion 311 and the back panel 100 to fix the second mounting portion 311 relative to the second back panel portion in the first direction F1; the second stopper is arranged on the second backlight source 320 to abut against the second light guide end.

[0093] In some embodiments of the present disclosure, the second heat sink 310 is generally a metal sheet with thermal conductivity such as an aluminum sheet. For example, the second heat sink 310 can be made of 6063 aluminum extrusion material. The second backlight source 320 is fixed on the second heat sink 310, and the heat of the second backlight source 320 is dissipated through the thermal conductivity of the second heat sink 310.

[0094] In some embodiments of the present disclosure, the second heat sink 310 includes a second mounting portion 311 and a second folded edge 312 perpendicular to the second mounting portion 311, the second mounting portion 311 is used to be installed on the second back panel portion, and the second folded edge 312 is used to install the second backlight source 320, so that the second backlight source 320 is located at the second end of the back panel 100.

[0095] In some embodiments of the present disclosure, optionally, the first light guiding end of the light guide plate 400 may abut against the first backlight source 220 and / or the first folded edge 212 .

[0096] In some embodiments of the present disclosure, the second backlight source 320 may be a light bar, that is, the second backlight source 320 may include a second circuit board and a plurality of second sub-light sources disposed on the second circuit board, and the plurality of second sub-light sources are arranged in a straight line along the second direction F2 on the second circuit board. Optionally, the second sub-light source may be a light emitting diode or an electroluminescent sheet.

[0097] In some embodiments of the present disclosure, the second connecting component may be a screw, and a mounting through hole may be opened on the second mounting portion 311. The screw passes through the through hole and is connected to the second back panel portion, so that the second mounting portion 311 / the second heat sink 310 can be fixed on the second back panel portion, and the second heat sink 310 can be locked on the second back panel portion, so that the second backlight source 320 is fixed relative to the back panel 100.

[0098] In some embodiments of the present disclosure, a second block is disposed on the second backlight source 320, and the second block is used to abut against the second light guide end, thereby preventing the second light guide end of the light guide plate 400 from directly abutting against the second circuit board or the second sub-light source. On the one hand, this can prevent the second circuit board from being crushed and damaged by the second light guide end, and on the other hand, this can prevent the heat generated by the second sub-light source directly contacting the light guide plate 400 from causing the light guide plate 400 to melt due to the heat.

[0099] In some embodiments of the present disclosure, as described above, in the first direction F1, the light guide plate 400 is limited in the first direction F1 by the first stopper 250 and the second stopper.

[0100] In some embodiments of the present disclosure, the second stopper may be a patch-type stopper, that is, the second stopper may be attached to the second circuit board. The second stopper is formed on the second circuit board in an attached manner. Therefore, the size of the surface of the second stopper used to abut against the light guide plate 400 is not affected by factors such as welding, and the size of the second stopper may be appropriately increased. For example, the area of ​​the abutment surface of the second stopper used to abut against the light guide plate 400 may be 15.6 mm×7.7 mm. By increasing the area of ​​the abutment surface of the second stopper abutting against the light guide plate 400, the pressure generated by the second light guide end of the light guide plate 400 squeezing the first stopper 250 may be improved, and the problem of the second stopper being easily detached from the first circuit board 221 after being squeezed may be avoided to a certain extent.

[0101] In some embodiments of the present disclosure, the second stopper may be made of polymethyl methacrylate and / or polycarbonate material.

[0102] As an optional embodiment, the light guide plate 400 includes a third light guide end and a fourth light guide end opposite to each other in the second direction F2; the back panel 100 is provided with a third stopper and a fourth stopper opposite to each other in the second direction F2, the third stopper abuts against the third light guide end, and the fourth stopper abuts against the fourth light guide end; the second direction F2 is perpendicular to the first direction F1.

[0103] In some embodiments of the present disclosure, a third stopper and a fourth stopper are arranged on the back panel 100 so that the third stopper abuts against the third light guide end, and the fourth stopper abuts against the third light guide end, so that the light guide plate 400 is limited in the second direction F2 by the third stopper and the fourth stopper.

[0104] In some embodiments of the present disclosure, the third stopper and the fourth stopper may be made of silicone, that is, the third stopper and the fourth stopper may be silicone stoppers.

[0105] As an optional implementation, Fig.10 and Fig.11 As shown, the backlight module also includes a rubber frame 500, which includes an annular rubber frame portion 510 surrounding the back plate 100 and a rubber frame limiting portion 520 connected to the annular rubber frame portion 510, and the rubber frame limiting portion 520 is located on the side of the light guide plate 400 away from the back plate 100, and the rubber frame limiting portion 520 abuts against the light guide plate 400 in a third direction, and the third direction is perpendicular to both the first direction F1 and the second direction F2.

[0106] In some embodiments of the present disclosure, Fig.10 and Fig.11 As shown, the annular rubber frame portion 510 is arranged around the back plate 100, and the rubber frame limiting portion 520 is located on the side of the light guide plate 400 away from the back plate 100, that is, the rubber frame 500 is arranged around the back plate 100 and the light guide plate 400 and extends to the upper side of the light guide plate 400 (the side away from the back plate 100) to fix the light guide plate 400 and the back plate 100 together. In the third direction, the rubber frame limiting portion 520 can limit the light guide plate 400.

[0107] In some embodiments of the present disclosure, the backlight module further includes a reflective sheet, which is located between the light guide plate 400 and the back plate 100 , and is used to reflect light to improve light utilization.

[0108] In some embodiments of the present disclosure, Figure 1 and Figure 2As shown, the backlight module further includes an optical film layer group 700, which is disposed on the upper side of the light guide plate 400 (the side away from the back plate 100), and the optical film layer group 700 can be used to adjust and control the color and brightness of the backlight to achieve a better display effect. Optionally, the optical film layer group 700 can include any one or more of a prism sheet, a reflective polarizer, a diffuser, a brightness enhancement film, and a protective film.

[0109] In some embodiments of the present disclosure, such as Fig.10 and Fig.11 As shown, the annular rubber frame portion 510 is arranged around the back plate 100. When the backlight module further includes the optical film layer group 700, the rubber frame limiting portion 520 is located on the side of the optical film layer group 700 away from the back plate 100. That is, the rubber frame is arranged around the back plate 100, the light guide plate 400 and the optical film layer group 700 and extends to the upper side of the optical film layer group 700 (the side away from the back plate 100) to fix the optical film layer group 700, the light guide plate 400 and the back plate 100 together. In the third direction, the rubber frame limiting portion 520 can limit the optical film layer group 700 and the light guide plate 400.

[0110] As an optional implementation, Fig.10 and Fig.11 As shown, the backlight module further includes a dustproof member 600 , which is located between the rubber frame limiting portion 520 and the light guide plate 400 , and the dustproof member 600 is interference fit with the rubber frame limiting portion 520 and the light guide plate 400 .

[0111] In related technologies, the foreign matter control standard for backlight modules is generally 1.5mm.

[0112] In some embodiments of the present disclosure, Fig.10 and Fig.11 As shown, by arranging a dustproof part 600 between the rubber frame limiting part 520 and the light guide plate 400, the dustproof part 600 is interference fit with the rubber frame limiting part 520 and the light guide plate 400. The dustproof part 600 can be a ring structure, and a circle of barrier structure can be formed in the backlight module through the dustproof part 600 to block foreign matter from entering the interior of the backlight module, that is, to block foreign matter outside the display area, which can improve the dustproof effect of the backlight module, and then improve the foreign matter control standard of the backlight module, and raise the foreign matter control standard to below 0.5mm. Compared with the backlight module of the related art, the foreign matter control standard of the backlight module provided by the present disclosure is significantly improved, so that the display device including the backlight module can meet the medical display field with higher foreign matter requirement standards, and can prevent misdiagnosis caused by displaying foreign matter in the medical display device to a certain extent.

[0113] In some embodiments of the present disclosure, the dustproof part 600 may be foam. Optionally, the foam material of the dustproof part 600 may be KE951U+DST-10. Optionally, the thickness of the foam in the third direction may be 2.0 mm, and the foam may have an interference of 0.03 mm with the rubber frame limiter 520 and the light guide plate 400 in the third direction to ensure that the foam fits tightly with the rubber frame limiter 520 and the light guide plate 400.

[0114] In some embodiments of the present disclosure, Figure 2 As shown, when the backlight module further includes the optical film layer group 700 , the dustproof member 600 is located between the rubber frame limiting portion 520 and the optical film layer group 700 .

[0115] In some backlight modules disclosed in the present invention, Figures 1 to 11 As shown, when the light guide plate 400 expands due to heat, the second backlight module is fixed to the second back plate portion, so the light guide plate 400 expands in the direction of the first backlight module, that is, the expansion of the first light guide end pushes the first stopper 250, thereby driving the first backlight source 220 to push the first heat sink 210. At the same time, the second elastic member 240 is compressed by the thrust of the first heat sink 210, and the first heat sink 210 moves toward the first end of the back plate 100, and the light guide plate 400 and the first heat sink 210 move synchronously, so the gap between the light guide plate 400 and the first stopper 250 / the first backlight source 220 remains unchanged. When the light guide plate 400 contracts, the second elastic member 240 generates a rebound force, pushing the first heat sink 210 to move toward the second end of the back plate 100. At this time, the light guide plate 400 and the first heat sink 210 move synchronously, so the gap between the light guide plate 400 and the first stopper 250 / the first backlight source 220 remains unchanged. The backlight module provided by the present disclosure can always ensure that the gap between the light guide plate 400 and the first stopper 250 / first backlight source 220 remains unchanged regardless of the expansion and contraction of the light guide plate 400, thereby maintaining the brightness uniformity of the backlight module.

[0116] Based on the same inventive concept, the embodiment of the present disclosure further proposes a display device, which includes a display panel 1000 and the above-mentioned backlight module. The display panel 1000 is located on a side of the light guide plate 400 away from the back plate 100 .

[0117] Since the display device provided by the present invention includes the backlight module of the above technical solution, the display device provided by the present invention has all the beneficial effects of the above backlight module, which will not be described in detail here.

[0118] In some embodiments of the present disclosure, the display panel 1000 is a liquid crystal display panel 1000 .

[0119] In some embodiments of the present disclosure, Figure 1As shown, the display device further includes conventional structures such as a middle frame 800 and a front frame 900, which will not be described in detail here.

[0120] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0121] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0122] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0123] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A backlight module, characterized in that: The backlight module comprises: A back plate, the back plate comprising a first back plate portion and a second back plate portion opposite to each other in a first direction; A first light source assembly, wherein the first light source assembly is movably disposed on the first back plate portion in the first direction; A second light source assembly, the second light source assembly is disposed on the second back plate portion; and A light guide plate, the light guide plate comprising a first light guide end and a second light guide end opposite to each other in the first direction, the light guide plate being arranged on the back plate, the first light guide end abutting against the first light source assembly so that the first light source assembly can move following the first light guide end, and the second light guide end abutting against the second light source assembly.

2. The backlight module according to claim 1, characterized in that: The first light source assembly comprises: A first heat sink, the first heat sink comprising a first mounting portion and a first folded edge perpendicular to the first mounting portion; A first backlight source, the first backlight source is arranged at the first folded edge; and A first connecting component is connected to the first mounting portion and the back plate respectively, so that the first mounting portion can move relative to the first back plate portion in the first direction.

3. The backlight module according to claim 2, characterized in that: The first mounting portion defines a runway-shaped movable groove extending along the first direction; the first connecting component includes a first connecting member and a first elastic member, the first connecting member is disposed in the runway-shaped movable groove and is connected to the back plate; the first elastic member is disposed in the runway-shaped movable groove and abuts against the first connecting member at least in the first direction.

4. The backlight module according to claim 3, characterized in that: The first elastic member is sleeved on the first connecting member.

5. The backlight module according to any one of claims 2 to 4, characterized in that: The back panel also includes a back panel folded edge, which is arranged on the first back panel portion and perpendicular to the first back panel portion; the first light source assembly also includes a second elastic member, the end of the second elastic member away from the second back panel portion abuts on the back panel folded edge, the end of the second elastic member adjacent to the second back panel portion abuts on the first heat sink, and the compressible amount of the second elastic member in the first direction is greater than the expansion deformation amount of the light guide plate.

6. The backlight module according to claim 5, characterized in that: The first mounting portion is provided with a receiving groove; the back plate folding edge and the second elastic member are both located in the receiving groove.

7. The backlight module according to claim 2, wherein: The first light source assembly further comprises: A first stopper is disposed on the first backlight source to abut against the first light guide end.

8. The backlight module according to claim 7, characterized in that: The first stopper is a patch type stopper.

9. The backlight module according to claim 7, wherein: The second light source assembly comprises: A second heat sink, the second heat sink comprising a second mounting portion and a second folded edge perpendicular to the second mounting portion; a second backlight source, the second backlight source being arranged at the second folded edge; a second connecting component, the second connecting component is connected to the second mounting portion and the back plate respectively, so that the second mounting portion is fixed relative to the second back plate portion in the first direction; and A second stopper is disposed on the second backlight source to abut against the second light guide end.

10. The backlight module according to claim 9, characterized in that: The light guide plate includes a third light guide end and a fourth light guide end opposite to each other in a second direction; the back plate is provided with a third stopper and a fourth stopper opposite to each other in the second direction, the third stopper abuts against the third light guide end, and the fourth stopper abuts against the fourth light guide end; the second direction is perpendicular to the first direction.

11. The backlight module according to claim 10, wherein: The backlight module also includes: The rubber frame includes an annular rubber frame portion surrounding the back plate and a rubber frame limiting portion connected to the annular rubber frame portion, the rubber frame limiting portion is located on a side of the light guide plate away from the back plate, the rubber frame limiting portion abuts against the light guide plate in a third direction, and the third direction is perpendicular to both the first direction and the second direction.

12. The backlight module according to claim 11, wherein: The backlight module also includes: A dustproof part, wherein the dustproof part is located between the rubber frame limiting part and the light guide plate, and the dustproof part, the rubber frame limiting part and the light guide plate are all interference fit.

13. A display device, characterized in that: The display device comprises a display panel and a backlight module as claimed in any one of claims 1 to 12, wherein the display panel is located on a side of the light guide plate away from the back plate.

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