Backlight module and display device

Abstract

The invention discloses a backlight module and a display device. The backlight module comprises a first back frame, a first light guide plate, a crimping structure and a first buffer pad. The first light guide plate is supported by the first back frame, the crimping structure comprises a fixing part and a crimping part, and the fixing part is connected with the first back frame; the first buffer pad is arranged on the crimping part, the crimping part of the crimping structure is located on the light emitting side of the first light guide plate, the backlight module further comprises a pressed surface, and the first buffer pad is in contact fit with the pressed surface so that the first light guide plate can be tightly pressed on the first back frame by the crimping part of the crimping structure across the first buffer pad. The first light guide plate is tightly pressed on the first back frame through the crimping part across the first buffer pad, so that the first light guide plate can be prevented from being fixed by using an adhesive, the first buffer pad can also absorb the size error of the crimping structure, and poor fixation or light leakage of the first light guide plate caused by factors such as buckling deformation of the crimping structure and the like is avoided; therefore, the first light guide plate can be pressed on the first back frame by the crimping part through the first buffer pad.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a backlight module and a display device. Background Art

[0002] The backlight module is one of the key components of the display device. The backlight is mainly composed of a light source, a light guide plate, an optical film, a back plate, etc.

[0003] The working principle of the backlight source is to convert a point light source into a surface light source, providing the display device with the external light source required for display. For example, when the light source of the backlight module is a light-emitting diode (LED), the light-emitting diode and the flexible printed circuit (FPC) form a light bar, and the light emitted by the linear light source array composed of the light-emitting diode enters from the light-incoming surface of the light guide plate; the light is transmitted inside the light guide plate and irradiates the mesh points of the light guide plate, resulting in scattering, and then the light is output from the light-emitting surface of the light guide plate to form a surface light source. Summary of the invention

[0004] The disclosed embodiments provide a backlight module and a display device. The backlight module can avoid using adhesive to fix the first light guide plate. The first buffer pad can also absorb the dimensional error of the crimping structure to avoid factors such as warping and deformation of the crimping structure that may lead to poor fixation of the first light guide plate or light leakage, so that the crimping part can press the first light guide plate onto the first back frame through the first buffer pad.

[0005] At least one embodiment of the present disclosure provides a backlight module, comprising: a first back frame; a first light guide plate supported by the first back frame; a crimping structure, comprising a fixing portion and a crimping portion, the fixing portion being connected to the first back frame; a first buffer pad, arranged on the crimping portion; the crimping portion of the crimping structure is located on the light emitting side of the first light guide plate, the backlight module also includes a pressed surface, the first buffer pad is in contact with and cooperates with the pressed surface so that the crimping portion of the crimping structure presses the first light guide plate onto the first back frame via the first buffer pad.

[0006] For example, in the backlight module provided in an embodiment of the present disclosure, the pressed surface includes the light emitting surface of the first light guide plate.

[0007] For example, in the backlight module provided in an embodiment of the present disclosure, the material of the first buffer pad includes black elastic material.

[0008] For example, in the backlight module provided in one embodiment of the present disclosure, the fixing part includes a first connecting part, and in a direction parallel to the first light guide plate, the first connecting part is located on a side of the crimping part away from the center of the first light guide plate, and in a direction perpendicular to the first light guide plate, the first connecting part is located on a side of the crimping part away from the first light guide plate; the fixing part also includes a second connecting part, and the first connecting part is connected to the crimping part through the second connecting part.

[0009] For example, in the backlight module provided in an embodiment of the present disclosure, the crimping structure is a sheet-like structure with uniform thickness.

[0010] For example, in the backlight module provided in one embodiment of the present disclosure, the fixing portion of the crimping structure is connected to the first back frame by at least one of snapping, screwing, bonding, riveting, welding, and interference fit, or the crimping structure and the first back frame are integrally formed.

[0011] For example, in a backlight module provided in an embodiment of the present disclosure, the crimping portion of the crimping structure extends along the direction of the edge of the first light guide plate being pressed, and the length of the crimping portion of the crimping structure in the extension direction is greater than or equal to the length of the edge.

[0012] For example, in a backlight module provided in an embodiment of the present disclosure, the backlight module includes a plurality of crimping structures, and the plurality of crimping structures are arranged on the same side of the first light guide plate to press the side of the first light guide plate onto the first back frame.

[0013] For example, the backlight module provided in an embodiment of the present disclosure further includes: a second back frame connected to the first back frame; and a second light guide plate supported by the second back frame and located between the first light guide plate and the second back frame.

[0014] For example, in the backlight module provided in an embodiment of the present disclosure, the crimping structure, the first back frame and the second back frame are an integrally formed structure.

[0015] For example, in a backlight module provided in an embodiment of the present disclosure, the first back frame includes a side main body portion and a cantilever portion, the cantilever portion is suspended from the side main body portion and the cantilever portion is parallel to the first light guide plate, the second back frame includes a bottom main body portion and a side surrounding portion, the side surrounding portion surrounds the edge of the bottom main body portion close to the side main body portion, the side surrounding portion is located between the bottom main body portion and the cantilever portion, the fixing portion of the crimping structure is connected to the side main body portion, the first light guide plate is arranged on the cantilever portion, and the second light guide plate is arranged on the bottom main body portion.

[0016] For example, in the backlight module provided in one embodiment of the present disclosure, the outer side surface of the side main body portion includes a limiting structure, the crimping structure includes an opening, and the limiting structure and the opening are designed to cooperate to fix the crimping structure on the side main body portion.

[0017] For example, in the backlight module provided in an embodiment of the present disclosure, it also includes: a second buffer pad, which is arranged on the cantilever portion and located between the first light guide plate and the cantilever portion, and the second buffer pad is in contact with the first light guide plate.

[0018] For example, in the backlight module provided in one embodiment of the present disclosure, it also includes: a plurality of first light sources, which are arranged on the side of the first light guide plate and between the crimping structure and the first back frame; a first light bar substrate, which is arranged on the first back frame, and the plurality of first light sources are arranged on the first light bar substrate, and the first light bar substrate is configured to drive the plurality of first light sources to emit light; a plurality of second light sources, which are arranged on the side of the second light guide plate or on the side of the second light guide plate away from the first light guide plate; a second light bar substrate, which is arranged on the second back frame, and the plurality of second light sources are arranged on the second light bar substrate, and the second light bar substrate is configured to drive the plurality of second light sources to emit light.

[0019] For example, in a backlight module provided in an embodiment of the present disclosure, it also includes: an optical film, which is arranged on the light output side of the first light guide plate, and the pressed surface includes a surface of the optical film away from the first light guide plate.

[0020] At least one embodiment of the present disclosure provides a display device, comprising: a backlight module according to any one of the above; and a display module located on the light emitting side of the first light guide plate.

[0021] For example, a display device provided in one embodiment of the present disclosure also includes: a substrate, located between the first light guide plate and the display module; and an optical structure layer, located between the substrate and the first light guide plate, the refractive index of the optical structure layer is smaller than the refractive index of the first light guide plate, and the pressed surface includes a surface of the substrate away from the first light guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure, but are not intended to limit the present disclosure.

[0023] Figure 1 is a cross-sectional schematic diagram of a backlight module;

[0024] Figure 2 is a cross-sectional schematic diagram of another backlight module;

[0025] Figure 3 A cross-sectional schematic diagram of a backlight module provided by an embodiment of the present disclosure;

[0026] Figure 4 A schematic diagram of a partial structure of a crimping structure provided by an embodiment of the present disclosure;

[0027] Figure 5 A schematic diagram of a partial structure of another crimping structure provided by an embodiment of the present disclosure;

[0028] Figure 6 A schematic cross-sectional structure diagram of another backlight module provided by an embodiment of the present disclosure;

[0029] Figure 7 A schematic cross-sectional structure diagram of another backlight module provided by an embodiment of the present disclosure;

[0030] Figure 8 A schematic cross-sectional structure diagram of another backlight module provided by an embodiment of the present disclosure;

[0031] Fig. 9 It is a schematic diagram of the local structure of the crimping structure shown in the figure;

[0032] Fig.10 A schematic cross-sectional structure diagram of another backlight module provided by an embodiment of the present disclosure;

[0033] Fig.11 A cross-sectional schematic diagram of a display device provided by an embodiment of the present disclosure;

[0034] Fig.12 A schematic cross-sectional structure diagram of another display device provided by an embodiment of the present disclosure;

[0035] Fig.13 A schematic diagram of a partial structure of another display device provided by an embodiment of the present disclosure;

[0036] Fig.14 A schematic cross-sectional structure diagram of another display device provided by an embodiment of the present disclosure;

[0037] Fig.15 A schematic diagram of a partial structure of another display device provided by an embodiment of the present disclosure;

[0038] Fig.16 for Fig.15 A schematic cross-sectional structure diagram of the display device 200 along the cutting line MN is shown; and

[0039] Fig.17 A schematic cross-sectional structure diagram of another display device provided in one embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0041] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0042] Unless otherwise defined, the features such as "parallel", "perpendicular" and "same" used in the embodiments of the present disclosure include the situations of "parallel", "perpendicular", "same" in a strict sense, as well as the situations of "approximately parallel", "approximately perpendicular", "approximately the same", etc., which contain certain errors. For example, the above-mentioned "approximately" may mean that the difference of the compared objects is within 10% or 5% of the average value of the compared objects. When the number of a component or element is not specifically indicated in the following text of the embodiments of the present disclosure, it means that the component or element may be one or more, or may be understood as at least one. "At least one" refers to one or more, and "multiple" refers to at least two. The "same-layer arrangement" in the embodiments of the present disclosure refers to the relationship between multiple film layers formed by the same material after the same step (for example, a one-step patterning process). The "same layer" here does not always mean that the thickness of multiple film layers is the same or the height of multiple film layers in the cross-sectional view is the same.

[0043] Figure 1 FIG. 1 is a cross-sectional schematic diagram of a backlight module. Figure 1As shown, the light guide plate 10 is fixed to the light bar substrate 11, and the light source 12 is arranged on the light bar substrate 11, and the light source 12 is located on the side of the light guide plate 10. In order to ensure that the installation of the light guide plate 10 is more stable and reliable, the light guide plate 10 is generally adhered to the light bar substrate 11 by using a rubber strip 13. However, where the light guide plate 10 is adhered with the rubber strip 13, the rubber strip 13 will destroy the total reflection condition of the light guide plate 10, and part of the light will be emitted from the light guide plate 10, causing brightness loss and affecting the display of the display device. In order to reduce the brightness loss caused by the rubber strip 13, a layer of alloy strip 14 can be added to the area where the rubber strip 13 is adhered to the light guide plate 10 to reduce the brightness loss. However, the addition of the alloy strip 13 also brings about an increase in cost.

[0044] Figure 2 FIG. 1 is a cross-sectional schematic diagram of another backlight module. Figure 2 As shown, when the frame 15 is used to crimp the light guide plate 10, since the end 15a of the frame 15 is a cantilever structure, the size of the end 15a is difficult to control and the end 15a is prone to warping and deformation. When the side of the light guide plate 10 is crimped, the warped and deformed end 15a cannot be crimped to the light guide plate 10, resulting in poor fixation of the light guide plate 10 and light leakage problems.

[0045] The embodiments of the present invention provide a backlight module and a display device. The backlight module includes a first back frame, a first light guide plate, a crimping structure and a first buffer pad. The first light guide plate is supported by the first back frame, and the crimping structure includes a fixing portion and a crimping portion, wherein the fixing portion is connected to the first back frame; the first buffer pad is arranged on the crimping portion, and the crimping portion of the crimping structure is located on the light emitting side of the first light guide plate. The backlight module also includes a pressed surface, and the first buffer pad is in contact with and cooperates with the pressed surface so that the crimping portion of the crimping structure presses the first light guide plate onto the first back frame via the first buffer pad. It should be noted that the contact and cooperation between the first buffer pad and the pressed surface means that the first buffer pad is in direct contact with the pressed surface, and there is no other structure or substance between the two, for example, there is no adhesive strip or glue between the first buffer pad and the pressed surface.

[0046] In the backlight module provided by the embodiment of the present disclosure, by providing a first buffer pad between the crimping portion and the pressed surface, the crimping portion presses the first light guide plate onto the first back frame via the first buffer pad. On the one hand, it is possible to avoid using glue or adhesive strips to fix the first light guide plate onto the first back frame, and avoid the glue or adhesive strips affecting the optical performance of the pressed surface or the first light guide plate. On the other hand, the first buffer pad can also absorb the dimensional error of the crimping structure, and avoid the warping deformation and other factors of the crimping structure causing poor fixation or light leakage of the first light guide plate. The first buffer pad can also absorb the assembly error between the crimping structure and the first light guide plate, and avoid the poor fixation or light leakage of the first light guide plate caused by the assembly error, so that the crimping portion can press the first light guide plate onto the first back frame via the first buffer pad. In addition, the first buffer pad can also absorb the dimensional deviation caused by the deformation, thermal expansion, etc. of the first light guide plate, and further ensure that the first light guide plate is installed in place.

[0047] The backlight module and the display device provided by the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0048] An embodiment of the present disclosure provides a backlight module. Figure 3 FIG. 1 is a cross-sectional schematic diagram of a backlight module provided by an embodiment of the present disclosure. Figure 3 As shown, the backlight module 100 includes a first back frame 110, a first light guide plate 120, a crimping structure 130 and a first buffer pad 140. The first light guide plate 120 is supported by the first back frame 110, the crimping structure 130 includes a fixing portion 131 and a crimping portion 132, the fixing portion 131 is connected to the first back frame 110; the first buffer pad 140 is arranged on the crimping portion 132, the crimping portion 132 of the crimping structure 130 is located at the light emitting side of the first light guide plate 120, the backlight module 100 also includes a pressed surface S1, the first buffer pad 140 contacts and cooperates with the pressed surface S1 so that the crimping portion 132 of the crimping structure 130 presses the first light guide plate 120 onto the first back frame 110 via the first buffer pad 140. It should be noted that the contact and cooperation between the first buffer pad 140 and the pressed surface S1 means that the first buffer pad 140 and the pressed surface S1 are in direct contact with each other without any other structure therebetween, for example, there is no rubber strip or adhesive between the first buffer pad 140 and the pressed surface S1.

[0049] In the backlight module 100 provided in the embodiment of the present disclosure, the first buffer pad 140 is provided between the crimping portion 132 and the pressed surface S1, and the crimping portion 132 presses the first light guide plate 120 onto the first back frame 110 via the first buffer pad 140. On the one hand, it is possible to avoid using adhesive or adhesive strips to fix the first light guide plate 120 onto the first back frame 110, and avoid the adhesive or adhesive strips affecting the optical performance of the pressed surface S1 or the first light guide plate 120. On the other hand, the first buffer pad 140 can also absorb the size error of the crimping structure 130, and avoid the warping and deformation of the crimping structure 130 and other factors that cause poor fixation or light leakage of the first light guide plate 120. The first buffer pad 140 can also absorb the assembly error between the crimping structure 130 and the first light guide plate 120, and avoid the assembly error that causes poor fixation or light leakage of the first light guide plate 120, so that the crimping portion 132 can press the first light guide plate 120 onto the first back frame 110 via the first buffer pad 140. In addition, the first buffer pad 140 can also absorb the dimensional deviation caused by the deformation, thermal expansion, etc. of the first light guide plate 120, and further ensure that the first light guide plate 120 is installed in place. Figure 3 Only a cross-sectional view of one side of the backlight module 100 is schematically shown. For example, an opposite side parallel to the side may also adopt the same or similar structure, which will not be described in detail herein.

[0050] In some examples, such as Figure 3 As shown, the first light guide plate 120 can be a two-dimensional light guide plate or a three-dimensional light guide plate. For example, when the first light guide plate 120 is a three-dimensional light guide plate, it can be used for three-dimensional display. Poor crimping and fixing of the three-dimensional light guide plate will cause light leakage, which will affect the three-dimensional display. Using adhesive to fix the three-dimensional light guide plate will destroy the optical properties of the three-dimensional light guide plate and affect the three-dimensional display. The first light guide plate 120 is pressed tightly against the first back frame 110 through the first buffer pad 140 by the crimping structure 130, which can avoid light leakage and avoid using adhesive to fix the three-dimensional light guide plate, thereby not affecting the display effect of the three-dimensional display.

[0051] In some examples, such as Figure 3 As shown, the pressed surface S1 includes the light emitting surface of the first light guide plate 120. The first buffer pad 140 contacts and cooperates with the light emitting surface of the first light guide plate 120, and the pressing portion 132 of the pressing structure 130 presses the first light guide plate 120 onto the first back frame 110 via the first buffer pad 140, which can avoid light leakage and the first buffer pad 140 will not damage the optical performance of the first light guide plate 120.

[0052] In some examples, the first buffer pad 140 includes an elastic material, so that the first buffer pad 140 can be better compressed to absorb size errors and assembly errors, and the pressing structure 130 can press the first light guide plate 120 onto the first back frame 110 .

[0053] In some examples, the ratio of the thickness dimension of the first buffer pad 140 after installation to the thickness dimension before installation is defined as the compression ratio. For example, the compression ratio of the first buffer pad 140 can be greater than or equal to 20%, so that the first buffer pad 140 can better absorb the size error of the pressing structure 130 and the assembly error of the backlight module 100, and can also make the pressing structure 130 press the first light guide plate 120 on the first back frame 110 more stably and reliably.

[0054] In some examples, the compression amount of the first buffer pad 140 (i.e., the difference between the thickness dimension before installation and the thickness dimension after installation) is greater than or equal to the deformation amount of the crimping portion 132. For example, the compression amount of the first buffer pad 140 may be 1.5 times the deformation amount of the crimping portion 132. For example, the compression amount of the first buffer pad 140 is greater than or equal to 0.2 mm. Thus, the first buffer pad 140 can better absorb the dimensional error of the crimping structure 130, so that the crimping structure 130 can more stably and reliably press the first light guide plate 120 onto the first back frame 110.

[0055] In some examples, the material of the first buffer pad 140 may be a black elastic material, so as to better prevent light leakage.

[0056] In some examples, the first buffer pad 140 may be a porous structure. The porous structure has good elasticity, so that the crimping structure 130 presses the first light guide plate 120 against the first back frame 110. In addition, the porous structure can also minimize the contact between the first buffer pad 140 and the first light guide plate 120, thereby minimizing the impact on the optical performance of the first light guide plate 120.

[0057] In some examples, such as Figure 3 As shown, the fixing part 131 includes a first connection part 1310. In a direction parallel to the first light guide plate 120, the first connection part 1310 is located on a side of the crimping part 132 away from the center of the first light guide plate 120. In a direction perpendicular to the first light guide plate 120, the first connection part 1310 is located on a side of the crimping part 132 away from the first light guide plate 120. The fixing part 131 also includes a second connection part 1311, and the first connection part 1310 is connected to the crimping part 132 through the second connection part 1311. Thus, at least part of the second connection part 1311 is inclined, and the structure formed by the first connection part 1310, the second connection part 1311 and the crimping part 132 is bent. With such a design, the size of the crimping part 132 extending or hanging from the fixing part 131 can be more stable, and the size accuracy can be higher, so that the matching relationship between the crimping part 132 and the first light guide plate 120, the first buffer pad 140 and the first back frame 110 can be more stable. Figure 3The structure formed by the first connection part 1310, the second connection part 1311 and the crimping part 132 is schematically shown to have two bends, however, the embodiment of the present disclosure is not limited to this. For example, the structure formed by the first connection part 1310, the second connection part 1311 and the crimping part 132 can have more than two bends.

[0058] In some examples, such as Figure 3 As shown, the fixing portion 131 also includes a third connection portion 1312. In a direction parallel to the first light guide plate 120, the third connection portion 1312 is located on a side of the first connection portion 1310 away from the second connection portion 1311. The third connection portion 1312 is connected to the first connection portion 1310. The third connection portion 1312 is bent toward the first back frame 110 relative to the first connection portion 1310, and the third connection portion 1312 and the first connection portion 1310 have an angle. Thus, the fixing portion 131 formed by the first connection portion 1310, the second connection portion 1311 and the third connection portion 1312 has at least two bends. Multiple bends can increase the strength of the fixing portion 131 and the crimping structure 130 itself, and can better ensure that the crimping portion 132 of the crimping structure 130 presses the first light guide plate 120 onto the first back frame. Moreover, the third connection portion 1312 is bent toward the first back frame 110, so that it can be better connected to the first back frame 110.

[0059] For example, Figure 3 As shown, the first connection part 1310 and the third connection part 1312 can form an L-shaped structure. The first connection part 1310 and the third connection part 1312 can also realize the function of a part of the frame. For example, the third connection part 1312 can strengthen the vertical strength of the frame. For example, the third connection part 1312 can also play a supporting role as a part of the frame.

[0060] In some examples, such as Figure 3 As shown, the crimping structure 130 is a sheet structure with uniform thickness. The sheet structure with uniform thickness can reduce the effect of the crimping structure 130 on the increase of the overall size of the backlight module 100. For example, when the thickness of the crimping structure 130 is relatively small, for example, when the thickness of the crimping structure 130 is below 1 mm, the effect of the crimping structure 130 on the overall size of the backlight module 100 can be almost negligible. In addition, the sheet structure with uniform thickness can have good elasticity, and when the crimping structure 130 is clamped to the first back frame 110 by adopting a clamping installation method, it can be convenient to clamp the crimping structure 130 to the first back frame 110. For example, the thickness of the crimping structure 130 can be any value between 0.1 mm and 5 mm.

[0061] It should be noted that uniform thickness means that the main structure of the crimping structure 130 is of uniform thickness, and reinforcing ribs or reinforcing features may be designed at corner positions, installation and fixing positions or other local positions. For example, the crimping structure 130 is of uniform thickness means that more than 80% of the area of ​​the crimping structure 130 is of uniform thickness.

[0062] In some examples, the material of the crimping structure 130 can be plastic, metal, or plastic and metal in one. The crimping structure 130 can be formed by injection molding, stamping, 3D printing, or the like, or a stamping process can be first used, and then an injection molding process can be used to form the crimping structure 130 that is a plastic and metal in one. For example, when the crimping structure 130 is a sheet structure with uniform thickness, the crimping structure 130 can be formed by a stamping process using a sheet raw material with uniform thickness to form a sheet structure with uniform thickness.

[0063] In some examples, such as Figure 3 As shown, the fixing portion 131 of the crimping structure 130 can be connected to the first back frame 110 by bonding. Of course, the embodiment of the present disclosure does not limit the connection method between the crimping structure 130 and the first back frame 110. For example, the fixing portion 131 of the crimping structure 130 can be connected to the first back frame 110 by at least one of snap connection, screw connection, bonding, riveting, welding, and interference fit. For example, the fixing portion 131 of the crimping structure 130 can also be integrally formed with the first back frame 110. For example, the crimping structure 130 can be integrally formed with the first backlight.

[0064] In some examples, such as Figure 3 As shown, the backlight module 100 further includes a plurality of first light sources 170 and a first light bar substrate 171. The plurality of first light sources 170 are located on the side of the first light guide plate 120 and between the crimping structure 130 and the first back frame 110. Figure 3 Only one first light source 170 is shown, and a plurality of first light sources 170 are arranged along one side of the first light guide plate. A first light bar substrate 171 is disposed on the first back frame 110, and a plurality of first light sources 170 are disposed on the first light bar substrate 171. The first light bar substrate 171 drives the plurality of first light sources 170 to emit light, and the light emitted by the first light source 170 is irradiated into the first light guide plate 120 from the side of the first light guide plate 120, and is output from the light exiting surface of the first light guide plate 120.

[0065] In some examples, such as Figure 3 As shown, the first light source 170 can be a light emitting diode, which can include a top-emitting light-emitting diode and a side-emitting light-emitting diode according to the light emitting direction. The light emitting direction of the top-emitting light-emitting diode is perpendicular to the light bar substrate, while the light emitting direction of the side-emitting light-emitting diode is parallel to the light bar substrate. Figure 3The first light source 170 shown is a side-emitting light emitting diode. Of course, the embodiment of the present invention does not limit the structure and form of the first light source 170.

[0066] Figure 4 FIG. 1 is a schematic diagram of a partial structure of a crimping structure provided by an embodiment of the present disclosure. Figure 4 As shown, the crimping portion 132 of the crimping structure 130 extends along the direction of the compressed edge of the first light guide plate 120, the arrow direction in the figure is the direction of the compressed edge of the first light guide plate 120, and the length of the crimping portion 132 of the crimping structure 130 in the extension direction (i.e., the arrow direction) is greater than or equal to the length of the compressed edge of the first light guide plate 120. Thus, the crimping structure 130 can ensure that the compressed edge of the first light guide plate 120 is completely compressed on the first back frame 110. For example, Figure 4 The shown pressing structure 130 can be used in the backlight module 100 or the display device 200 provided in the embodiment of the present disclosure. Of course, the embodiment of the present disclosure does not impose any specific limitation on the pressing structure 130.

[0067] Figure 5 FIG. 1 is a schematic diagram of a partial structure of another crimping structure provided by an embodiment of the present disclosure. Figure 5 The backlight module 100 includes a plurality of crimping structures 130, and the plurality of crimping structures 130 are arranged on the same side of the first light guide plate 120 to press the side of the first light guide plate 120 onto the first back frame 110. The direction of the arrow in the figure is the direction of the pressed side of the first light guide plate 120. The first light guide plate 120 is pressed onto the first back frame 110 by using a plurality of crimping structures 130, and the number of crimping structures 130 can be reasonably set according to the size of the first light guide plate 120 to improve assembly efficiency. In addition, other structures can be arranged between adjacent crimping structures 130 to facilitate the structural arrangement and functional design of the backlight module 100. For example, Figure 5 The shown pressing structure 130 can be used in the backlight module 100 or the display device 200 provided in the embodiment of the present disclosure. Of course, the embodiment of the present disclosure does not impose any specific limitation on the pressing structure 130.

[0068] Figure 6 FIG. 1 is a schematic cross-sectional view of another backlight module provided by an embodiment of the present disclosure. Figure 6As shown, the backlight module 100 also includes an optical film 174, which is arranged on the light-emitting side of the first light guide plate 120, and the pressed surface S1 also includes the surface of the optical film 174 away from the first light guide plate 120, and the crimping structure 130 presses the optical film 174 and the first light guide plate 120 onto the first back frame 110 via the first buffer pad 140. Thus, the first light guide plate 120 can be pressed onto the first back frame, and the optical film 174 can also be pressed onto the first back frame 110, without the need for other structures or adhesives to fix the optical film 174 and the first light guide plate 120. For example, the optical film 174 can be a combination of a prism sheet and a diffuser sheet. Of course, the disclosed embodiment does not limit the type or quantity of the optical film 174.

[0069] Figure 7 FIG. 1 is a schematic cross-sectional view of another backlight module provided by an embodiment of the present disclosure. Figure 7 As shown, the backlight module 100 includes a first light guide plate 120, a crimping structure 130, a first buffer pad 140 and a two-dimensional sub-backlight module 101. The two-dimensional sub-backlight module 101 is used for two-dimensional display, and the first light guide plate 120 can be a three-dimensional light guide plate for three-dimensional display. Therefore, the backlight module 100 can be used for both two-dimensional display and three-dimensional display. The embodiment of the present disclosure does not limit the specific structure of the two-dimensional sub-backlight module 101. For example, the two-dimensional sub-backlight module 101 can include a light source, a two-dimensional light guide plate and a back frame.

[0070] In some examples, such as Figure 7 As shown, the crimping structure 130 can be connected to the 2D sub-backlight module 101, for example, the crimping structure 130 can be connected to the back frame of the 2D sub-backlight module 101. The embodiment of the disclosure does not limit the connection form between the crimping structure 130 and the 2D sub-backlight module 101.

[0071] Figure 8 A schematic cross-sectional structure diagram of another backlight module provided by an embodiment of the present disclosure; Fig. 9 The schematic diagram of the partial structure of the crimping structure shown in the figure. Figure 8 and Fig. 9 As shown, the backlight module 100 includes a first back frame 110, a first light guide plate 120, a second back frame 150, a second light guide plate 160, a crimping structure 130 and a first buffer pad 140. The second back frame 150 is connected to the first back frame 110, and the second light guide plate 160 is supported by the second back frame 150 and is located between the first light guide plate 120 and the second back frame 150. The backlight module 100 has the same beneficial technical effects as the backlight module 100 described above, which will not be repeated here.

[0072] In some examples, such as Figure 8As shown, the first light guide plate 120 may be a three-dimensional light guide plate, and the second light guide plate 160 may be a two-dimensional light guide plate. The backlight module 10 may be used for two-dimensional display or three-dimensional display.

[0073] In some examples, such as Figure 8 As shown, the first back frame 110 includes a side main body portion 111 and a cantilever portion 112, the cantilever portion 112 is suspended from the side main body portion 111 and the cantilever portion 112 is parallel to the first light guide plate 120, the second back frame 150 includes a bottom main body portion 151 and a side surrounding portion 152, the side surrounding portion 152 surrounds the edge of the bottom main body portion 151 close to the side main body portion 111, and the side surrounding portion 152 is located between the bottom main body portion 151 and the cantilever portion 112, the fixing portion 131 of the crimping structure 130 is connected to the side main body portion 111, the first light guide plate 120 is arranged on the cantilever portion 112, and the second light guide plate 160 is arranged on the bottom main body portion 151.

[0074] In some examples, such as Figure 8 and Fig. 9 As shown, the outer side of the side body portion 111 includes a limiting structure 1110, and the crimping structure 130 includes an opening 1313. The limiting structure 1110 and the opening 1313 are designed to be matched so that the crimping structure 130 is fixed on the side body portion 111. For example, the limiting structure 1110 can be a protrusion on the outer side of the side body portion 111. For example, a part of the opening 1313 is formed on the third connecting portion 1312, and another part of the opening 1313 is formed on the first connecting portion 1310. The opening 1313 is snapped onto the limiting structure 1110, so that the cooperation between the limiting structure 1110 and the opening 1313 can limit the movement of the crimping structure 130 in the vertical and horizontal directions, so that the crimping structure 130 is stably fixed on the side body portion 111, so that the crimping portion 132 can stably press the first light guide plate 120 on the first back frame 110. Of course, the embodiment of the present disclosure does not limit the connection form between the limiting structure 1110 and the first back frame 110.

[0075] In some examples, such as Figure 8As shown, the backlight module 100 further includes a second buffer pad 141, which is disposed on the cantilever portion 112 and is located between the first light guide plate 120 and the cantilever portion 112. The second buffer pad 141 contacts and cooperates with the first light guide plate 120. It should be noted that the contact and cooperation between the second buffer pad 141 and the first light guide plate 120 means that the second buffer pad 141 is in direct contact with the first light guide plate 120, and there is no other structure between the two, for example, there is no adhesive strip or glue between the second buffer pad 141 and the first light guide plate 120. The second buffer pad 141 can absorb the size error of the cantilever portion 112 and the assembly error of the first light guide plate 120 and the cantilever portion 112, and further avoid the light leakage problem between the first light guide plate 120 and the first backlight; moreover, the second buffer pad 141 can also protect the first light guide plate 120, and avoid the white spot and white spot problems caused by the direct contact between the first light guide plate 120 and the cantilever portion 112.

[0076] In some examples, the material of the second buffer pad 141 may be a black elastic material, so as to better prevent light leakage.

[0077] In some examples, such as Figure 8 As shown, the backlight module 100 further includes a plurality of first light sources 170 and a first light bar substrate 171. The plurality of first light sources 170 are located on the side of the first light guide plate 120 and between the crimping structure 130 and the first back frame 110. The first light bar substrate 171 is disposed on the first back frame 110, and the plurality of first light sources 170 are disposed on the first light bar substrate 171, and the first light bar substrate 171 drives the plurality of first light sources 170 to emit light.

[0078] In some examples, such as Figure 8 As shown, the first light source 170 may be a top-emitting light emitting diode, and the first light bar substrate 171 may be disposed on the side body portion 111. Of course, the embodiment of the present disclosure does not limit the type of the first light source 170 and the installation position of the first light bar substrate 171.

[0079] In some examples, such as Figure 8 As shown, the backlight module 100 also includes a plurality of second light sources 172 and a second light bar substrate 173, the plurality of second light sources 172 are located on the side of the second light guide plate 160, the second light bar substrate 173 is arranged on the second back frame 150, the plurality of second light sources 172 are arranged on the second light bar substrate 173, and the second light bar substrate 173 drives the plurality of second light sources 172 to emit light.

[0080] In some examples, such as Figure 8As shown, the second light source 172 can be a top-emitting light emitting diode, and the second light bar substrate 173 can be disposed on the side surrounding portion 152. Of course, the disclosed embodiment does not limit the type of the second light source 172 and the installation position of the second light bar substrate 173. For example, the second light source 172 can also be a side-emitting light emitting diode, and the second light bar substrate 173 can be disposed on the bottom main body portion 151. For example, the second light source 172 can also be disposed on the side of the second light guide plate 160 away from the first light guide plate 120. In this case, the second light source 172 can be a top-emitting light emitting diode, and the second light bar substrate 173 is disposed on the bottom main body portion 151.

[0081] In some examples, such as Figure 8 As shown, an optical film 175 may be provided on the light emitting side of the second light guide plate 160 to improve the optical performance of the light emitting.

[0082] In some examples, such as Figure 8 As shown, the optical film 175 may be disposed between the cantilever portion 112 of the first back frame 110 and the second light guide plate 160 .

[0083] Fig.10 FIG. 1 is a schematic cross-sectional view of another backlight module provided by an embodiment of the present disclosure. Fig.10 As shown, the crimping structure 130, the first back frame 110 and the second back frame 150 of the backlight module 100 are an integrated structure. The integrated structure can not only reduce the number of parts, reduce the design and manufacturing costs, but also reduce the assembly time, further reducing the manufacturing cost.

[0084] In some examples, such as Fig.10 As shown, the one-piece structure of the crimping structure 130, the first back frame 110 and the second back frame 150 can be a sheet structure with uniform thickness. The sheet structure with uniform thickness can improve the yield rate of the one-piece structure and can also reduce the weight of the backlight module 100. For example, the thickness of the one-piece structure can be any value less than or equal to 5 mm. It should be noted that the uniform thickness of the one-piece structure means that the main structure of the one-piece structure is of uniform thickness, and reinforcing ribs or reinforcing features can be designed at corner positions, installation and fixing positions or other local positions. For example, the one-piece structure is of uniform thickness, which means that more than 80% of the area of ​​the one-piece structure is of uniform thickness.

[0085] In some examples, such as Fig.10As shown, the backlight module 100 further includes a bottom frame 178, which is located on a side of the integrated structure away from the first light guide plate 120. When the integrated structure is designed with equal thickness, the first back frame 110 and the second back frame 150 have a step difference in the light emitting direction of the first light guide plate 120, and the first back frame 110 and the second back frame 150 are in a stepped shape. The bottom frame 178 is arranged on a side of the first back frame 110 away from the first light guide plate 120 to increase the overall strength of the backlight module 100.

[0086] An embodiment of the present disclosure provides a display device. Fig.11 FIG. 1 is a cross-sectional schematic diagram of a display device provided by an embodiment of the present disclosure. Fig.11 As shown, the display device 200 includes a backlight module 100 and a display module 210, and the display module 210 is located at the light-emitting side of the first light guide plate 120. The display device 200 has the corresponding beneficial effects of the backlight module 100, which will not be described in detail.

[0087] For example, the backlight module 100 may be any backlight module 100 in the embodiments of the present disclosure. For example, the embodiments of the present disclosure do not limit the form of the display module 210 , for example, it may be a liquid crystal display module 210 or an organic light emitting diode display module 210 .

[0088] Fig.12 FIG. 1 is a schematic cross-sectional view of another display device provided by an embodiment of the present disclosure. Fig.12 As shown, the display device 200 includes a backlight module 100 and a display module 210. The backlight module 100 includes a first light guide plate 120, a first back frame 110, a second light guide plate 160, a second back frame 150, and a crimping structure 130. The second back frame 150 is connected to the first back frame 110, the first light guide plate 120 is supported by the first back frame 110, the second light guide plate 160 is supported by the second back frame 150, and is located between the first light guide plate 120 and the second back frame 150, and the display module 210 is located on the light exit side of the first light guide plate 120. For example, the first light guide plate 120 can be a three-dimensional light guide plate, and the second light guide plate 160 can be a two-dimensional light guide plate. Thus, the display device 200 can be used for both two-dimensional display and three-dimensional display.

[0089] In some examples, such as Fig.12 As shown, the crimping portion 132 and the fixing portion 131 of the crimping structure 130 of the backlight module 100 form an L-shaped structure, so that the thickness of the portion of the crimping structure 130 located on the light emitting side of the first light guide plate 120 can be minimized, thereby reducing the influence of the crimping structure 130 on the size of the display device 200 in the thickness direction.

[0090] In some examples, such as Fig.12As shown, the display device 200 may further include a cover plate 220, which is located on a side of the display module 210 away from the backlight module 100, and the cover plate 220 may play a decorative and protective role. For example, in the light emitting direction, the cover plate 220 may cover the display module 210 and the backlight module 100.

[0091] Fig.13 FIG. 1 is a schematic diagram of a partial structure of another display device provided by an embodiment of the present disclosure. Fig.13 As shown, the display device 200 includes a backlight module 100, a substrate 230, an optical structure layer 240 and a display module 210. The substrate 230 is located between the first light guide plate 120 and the display module 210, the optical structure layer 240 is located between the first light guide plate 120 and the substrate 230, and the refractive index of the optical structure layer 240 is less than the refractive index of the first light guide plate 120. The pressed surface S1 includes the surface of the substrate 230 away from the first light guide plate 120. Thus, the pressing structure 130 can press the substrate 230, the optical structure layer 240 and the first light guide plate 120 onto the first back frame 110.

[0092] In this example, the first light guide plate 120 can be a three-dimensional light guide plate. Since the refractive index of the optical structure layer 240 is smaller than that of the first light guide plate 120, the light emitted from the first light guide plate 120 will return to the first light guide plate 120 after passing through the optical structure layer 240. Through the structural features on the first light guide plate 120, the first light guide plate 120 can direct the emitted light, thereby realizing emitted light at different angles corresponding to the left eye and the right eye, thereby realizing three-dimensional display.

[0093] In some examples, the refractive index of the first light guide plate 120 may be 1.5, and the refractive index of the optical structure layer 240 may be any value between 1.0 and 1.5.

[0094] In some examples, the optical structure layer 240 may be a transparent porous structure. For example, the substrate 230 may be glass.

[0095] In some examples, optical glue may be provided on a side of the optical structure layer 240 close to the first light guide plate 120. For example, the refractive index of the optical glue may be the same as the refractive index of the first light guide plate 120.

[0096] In some examples, optical glue may be provided on a side of the substrate 230 close to the display module 210 , and the display module is fixed to the substrate 230 and the backlight module 100 through the optical glue.

[0097] In some examples, such as Fig.13As shown, the crimping structure 130 includes a crimping portion 132 and a fixing portion 131, and the crimping structure 130 has a plurality of bends, so that the crimping structure 130 has better strength and the size of the crimping portion 132 extending or hanging from the fixing portion 131 can be more stable, so that the display module 210 and the first light guide plate 120 can be more stably pressed onto the first back frame 110.

[0098] In some examples, such as Fig.13 As shown, the fixing portion 131 of the crimping structure 130 is provided with an opening 176, and the second back frame 150 is provided with an opening 177 at a corresponding position. For example, the crimping structure 130 can be fixed to the second back frame 150 by screws or buckles. Of course, the embodiment of the present disclosure is not limited to this. For example, the crimping structure 130 can also be directly fixed to the first back frame 110.

[0099] Fig.14 FIG. 1 is a schematic cross-sectional view of another display device provided by an embodiment of the present disclosure. Fig.14 As shown, the display device 200 and Fig.13 One of the differences of the display device 200 shown lies in the difference in the crimping structure 130. The crimping portion 132 and the fixing portion 131 of the crimping structure 130 form an L-shaped structure, thereby reducing the thickness of the portion of the crimping structure 130 located on the light emitting side of the first light guide plate 120, thereby reducing the influence of the crimping structure 130 on the size of the display device 200 in the thickness direction.

[0100] In some examples, such as Fig.14 As shown, the fixing portion 131 of the compression structure can be attached to the first back frame 110 and the second back frame 150. Of course, the embodiment of the present disclosure does not limit the fixing position and fixing method of the compression structure. For example, the compression structure 130 can also be directly fixed to the first back frame 110.

[0101] Fig.15 A schematic diagram of a partial structure of another display device provided by an embodiment of the present disclosure; Fig.16 for Fig.15 The cross-sectional structure diagram of the display device 200 along the cutting line MN is shown. Fig.15 and Fig.16 As shown, the display device 200 includes a plurality of press-fit structures 130, which are arranged on the same side of the first light guide plate 120 to press the side of the first light guide plate 120 against the first back frame 110, and a flexible circuit board 213 is included between adjacent press-fit structures 130, and the flexible circuit board 213 connects the display module 210 and a driver 222 driving the display module 210, and the driver 222 is located on a side of the second back frame 150 away from the first back frame 110. For example. The press-fit structure 130 can be Figure 5The crimping structure 130 is shown, of course, the embodiment of the present disclosure is not limited to this.

[0102] In some examples, such as Fig.15 As shown, five crimping structures 130 are arranged on one side of the display device 200, and the five crimping structures 130 are evenly arranged on the same side of the first light guide plate 120. Of course, the embodiment of the present disclosure does not limit the number and distribution of the crimping structures 130, and can be reasonably designed according to the size of the first light guide plate 120.

[0103] Fig.17 FIG. 1 is a schematic cross-sectional view of another display device provided by an embodiment of the present disclosure. Fig.17 As shown, the pressed surface S1 also includes the surface of the display module 210 away from the first light guide plate 120, and the pressing structure 130 presses the display module 210 and the first light guide plate 120 onto the first back frame 110 via the first buffer pad 140. Thus, the pressing structure 130 can press the first light guide plate 120 onto the first back frame 110, and can also press the display module 210 onto the first back frame 110, without other structures or adhesives to fix the display module 210 or the first light guide plate 120. Thus, the display module 210 can also have a lighter weight and a smaller size.

[0104] There are a few points to note:

[0105] (1) In the drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are involved, and other structures can refer to the general design.

[0106] (2) In the absence of conflict, features in the same embodiment or in different embodiments of the present disclosure may be combined with each other.

[0107] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A backlight module, comprising: First back frame; A first light guide plate, supported by the first back frame; A crimping structure, comprising a fixing portion and a crimping portion, wherein the fixing portion is connected to the first back frame; A first buffer pad, arranged on the crimping portion; Among them, the crimping part of the crimping structure is located on the light output side of the first light guide plate, the backlight module also includes a pressed surface, and the first buffer pad contacts and cooperates with the pressed surface so that the crimping part of the crimping structure presses the first light guide plate onto the first back frame through the first buffer pad.

2. The backlight module according to claim 1, wherein: The pressed surface includes a light emitting surface of the first light guide plate.

3. The backlight module according to claim 1, wherein: The material of the first buffer pad includes black elastic material.

4. The backlight module according to claim 1, wherein: The fixing portion comprises a first connecting portion, wherein in a direction parallel to the first light guide plate, the first connecting portion is located on a side of the pressing portion away from the center of the first light guide plate, and in a direction perpendicular to the first light guide plate, the first connecting portion is located on a side of the pressing portion away from the first light guide plate; The fixing portion further includes a second connecting portion, and the first connecting portion is connected to the crimping portion through the second connecting portion.

5. The backlight module according to any one of claims 1 to 4, wherein: The crimping structure is a sheet-like structure with uniform thickness.

6. The backlight module according to any one of claims 1 to 4, wherein: The fixing portion of the crimping structure is connected to the first back frame by at least one of snap connection, screw connection, bonding, riveting, welding, and interference fit, or the crimping structure and the first back frame are integrally formed.

7. The backlight module according to any one of claims 1 to 4, wherein: The crimping portion of the crimping structure extends along the direction of the edge of the first light guide plate being pressed, and the length of the crimping portion of the crimping structure in the extending direction is greater than or equal to the length of the edge.

8. The backlight module according to any one of claims 1 to 4, wherein: The backlight module comprises a plurality of pressing structures, and the plurality of pressing structures are arranged on the same side of the first light guide plate to press the side of the first light guide plate tightly onto the first back frame.

9. The backlight module according to any one of claims 1 to 4, further comprising: a second back frame connected to the first back frame; The second light guide plate is supported by the second back frame and is located between the first light guide plate and the second back frame.

10. The backlight module according to claim 9, wherein: The crimping structure, the first back frame and the second back frame are an integrally formed structure.

11. The backlight module according to claim 9, wherein: The first back frame includes a side main body portion and a cantilever portion, the cantilever portion is suspended from the side main body portion and the cantilever portion is parallel to the first light guide plate, the second back frame includes a bottom main body portion and a side surrounding portion, the side surrounding portion surrounds the edge of the bottom main body portion close to the side main body portion, the side surrounding portion is located between the bottom main body portion and the cantilever portion, the fixing portion of the crimping structure is connected to the side main body portion, the first light guide plate is arranged on the cantilever portion, and the second light guide plate is arranged on the bottom main body portion.

12. The backlight module according to claim 11, wherein: The outer side surface of the side main body portion includes a limiting structure, the crimping structure includes an opening, and the limiting structure and the opening are designed to cooperate to fix the crimping structure on the side main body portion.

13. The backlight module according to claim 11, further comprising: a second buffer pad, disposed on the cantilever portion and located between the first light guide plate and the cantilever portion, Wherein, the second buffer pad is in contact with and matched with the first light guide plate.

14. The backlight module according to claim 9, further comprising: A plurality of first light sources are arranged on the side of the first light guide plate and between the crimping structure and the first back frame; A first light bar substrate is disposed on the first back frame, the plurality of first light sources are disposed on the first light bar substrate, and the first light bar substrate is configured to drive the plurality of first light sources to emit light; A plurality of second light sources are arranged on a side of the second light guide plate or on a side of the second light guide plate away from the first light guide plate; The second light bar substrate is disposed on the second back frame, the plurality of second light sources are disposed on the second light bar substrate, and the second light bar substrate is configured to drive the plurality of second light sources to emit light.

15. The backlight module according to claim 1, further comprising: An optical film is arranged on the light-emitting side of the first light guide plate, Wherein, the pressed surface includes a surface of the optical film away from the first light guide plate.

16. A display device, comprising: The backlight module according to claim 1; as well as The display module is located on the light-emitting side of the first light guide plate.

17. The display device according to claim 16, further comprising: A substrate, located between the first light guide plate and the display module; as well as an optical structure layer, located between the substrate and the first light guide plate, wherein the refractive index of the optical structure layer is less than the refractive index of the first light guide plate, Wherein, the pressed surface includes a surface of the substrate away from the first light guide plate.

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