Backlight module and display device

Abstract

The utility model discloses a backlight module and a display device. The backlight module comprises a light guide plate; the light source is arranged on one side of the light incident surface of the light guide plate and is provided with a light emitting surface for incident light to the light incident surface; the back plate is provided with a bottom plate and a frame connected to the edge of the bottom plate, the back plate is used for containing the light guide plate and the light source, a supporting structure is arranged on the side, away from the light inlet face of the light guide plate, of the bottom plate and close to the frame, and the supporting structure comprises reinforcing ribs arranged on the surface of the bottom plate; the reinforcing ribs are arranged on the bottom plate, the supporting pieces correspond to the reinforcing ribs, the reinforcing ribs are formed by protruding the surface of the bottom plate, the surface of the side, away from the reinforcing ribs, of the bottom plate is sunken to form grooves, and the supporting pieces are attached to the interiors of the grooves. According to the supporting structure, the rigidity of the side edge of the back plate can be greatly improved, and therefore the elastic deformation resisting capacity when the module is stressed is improved.

Description

Technical Field

[0001] The utility model relates to the field of display technology, and more specifically, to a backlight module and a display device. Background Art

[0002] Liquid crystal modules (LCMs) are widely used in mobile phones, tablets, TVs, automotive devices, and wearable devices. LCMs consist of a thin film transistor liquid crystal display (TFT-LCD) panel and a backlight unit (BLU). The backlight unit provides the light source and primarily consists of a light guide plate, light source, and backplane. The display panel and backlight unit are stacked, with the edge of the display panel abutting the backplane of the backlight unit.

[0003] When conducting a weight test on an LCD display module, the LCD display module is supported at both ends of the fixture, and 100g / 20mm weights are placed in the middle of the light-incident side and the middle of the light-outgoing side of the display panel. The brightness value of each fixed point under the black screen (i.e., L0 screen) is recorded. The difference between the brightness value of each fixed point and the brightness value of the module center point under the black screen cannot exceed a fixed value. With the simultaneous improvement of various performance requirements of LCD display modules such as high brightness, thinness, and overall picture quality (subjective perception of the human eye), traditional display module structural designs are not easy to pass the weight test. Utility Model Content

[0004] The purpose of the present invention is to provide a backlight module and a display device, wherein the structure of the backlight module can improve the overall rigidity of the back plate without changing the requirements of the module appearance for the whole machine assembly.

[0005] According to one aspect of the present invention, a backlight module is provided, comprising:

[0006] a light guide plate having a light emitting surface and a light incident surface, wherein the light incident surface is a side surface intersecting the light emitting surface and for light incident;

[0007] a light source, disposed on one side of the light incident surface of the light guide plate and having a light emitting surface for incident light toward the light incident surface;

[0008] A back panel having a base plate and a frame connected to the edge of the base plate, the back panel being used to accommodate the light guide plate and the light source, a support structure being provided on the base plate at a side away from the light incident surface of the light guide plate and close to the frame, the support structure comprising reinforcing ribs provided on the surface of the base plate and a support sheet provided corresponding to the reinforcing ribs, the reinforcing ribs being formed by protrusions on the surface of the base plate, a surface of the base plate on a side away from the reinforcing ribs being recessed to form a groove, and the support sheet being attached to the groove.

[0009] Optionally, the bottom plate has a first surface and a second surface arranged opposite to each other, the first surface is close to the light guide plate, the reinforcing rib is formed on the second surface, and the groove is formed on the first surface.

[0010] Optionally, the depth of the groove ranges from 0.08 mm to 0.15 mm, and the width of the groove ranges from 10 mm to 15 mm.

[0011] Optionally, the support sheet is attached to the groove by double-sided tape, and the sum of the thickness of the double-sided tape and the support sheet is 0.01 mm to 0.03 mm smaller than the depth of the groove.

[0012] Optionally, the reinforcing rib and the groove are in the shape of a Chinese umbilical cord and are respectively arranged close to the edge of the bottom plate.

[0013] Optionally, there are two supporting sheets, which are respectively attached to the groove close to the light incident surface side of the light guide plate and away from the light incident surface side of the light guide plate.

[0014] Optionally, the supporting piece is U-shaped and is located on a side of the bottom plate away from the light incident surface of the light guide plate and in the grooves on both sides of the light incident surface of the light guide plate.

[0015] Optionally, the support piece is in the shape of a Chinese umbilical cord and is arranged in the groove at the edge of the bottom plate.

[0016] Optionally, the reinforcing ribs and the grooves are rectangular in shape, and the supporting piece is rectangular, 8-shaped, H-shaped or grid-shaped.

[0017] According to another aspect of the present invention, there is provided a backlight module as described above, and a display unit located on the light-emitting side of the backlight module.

[0018] Optionally, the edge of the display unit is attached to the back plate via a light-shielding tape, and the distance between the display unit and the backlight module ranges from 0.04 mm to 0.05 mm.

[0019] The beneficial effects of the utility model are as follows:

[0020] The back plate of the backlight module of the present invention is provided with a support structure on the side away from the light incident surface of the light guide plate and close to the frame. The reinforcing ribs and support sheets included in the support structure can greatly increase the rigidity of this side of the back plate, thereby improving the ability of the module to resist elastic deformation when subjected to force, that is, increasing the rigidity of the side of the liquid crystal module away from the light source, effectively avoiding stress light leakage of the liquid crystal module, and thereby improving the pass rate of its weight test. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific implementation of the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] Figure 1 A schematic diagram showing the display module of the present invention when performing a weight test.

[0023] Figure 2 A cross-sectional view of the display module of the present invention is shown.

[0024] Figure 3 A partial cross-sectional view of an embodiment of a display module of the present invention is shown.

[0025] Figure 4 A structural schematic diagram of an embodiment of the back plate of the utility model is shown.

[0026] Figure 5 A structural schematic diagram of another embodiment of the back plate of the utility model is shown.

[0027] Figure 6 A structural schematic diagram of another embodiment of the back plate of the utility model is shown.

[0028] Figure 7 A structural schematic diagram of an embodiment of the back plate of the utility model is shown.

[0029] Figure 8 A structural schematic diagram of an embodiment of the back plate of the utility model is shown.

[0030] Figure 9 A partial cross-sectional view of another embodiment of the display module of the present invention is shown. DETAILED DESCRIPTION

[0031] To more clearly illustrate the present invention, the present invention is further described below in conjunction with preferred embodiments and accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. Those skilled in the art should understand that the following detailed description is illustrative rather than restrictive and should not be used to limit the scope of protection of the present invention.

[0032] In the description of this disclosure, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two elements or interaction between two elements. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0033] In the disclosure, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact via another feature therebetween.

[0034] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0035] With the continuous development of liquid crystal display technology, the application areas of liquid crystal displays, especially color liquid crystal displays, are also expanding. The backlight module provides the light source for liquid crystal displays. Liquid crystal displays themselves do not emit light, and the performance of the backlight module's light source determines the visual appearance of the display. The backlight module is stacked with a reflective film layer, a light guide plate, a diffusion film layer, and upper and lower light-enhancing films in sequence. By installing an LED light strip on one side of the light guide plate, the light source across the entire light guide plate is uniformly distributed.

[0036] like Figure 1 As shown, when the LCD display module is subjected to a weight test, the LCD display module 100 is supported at both ends of the fixture 200, and 100g / 20mm weights are placed in the middle of the light incident side and the middle of the light output side of the display panel. The brightness value of each fixed point under the black screen (i.e., the L0 screen) is recorded. The difference between the brightness value of each fixed point and the brightness value of the module center point under the black screen cannot exceed a fixed value. The traditional display module structure design is not easy to pass the weight test.

[0037] Based on this, the embodiment of the present disclosure provides a backlight module, such as Figures 2 to 6As shown, the backlight module includes a light source 10, a light guide plate 20, and a back plate 30, wherein the light source 10 is configured to provide light, and includes a flexible circuit board and a plurality of backlight lamps arranged on the flexible circuit board. The plurality of backlight lamps can be used, but are not limited to, light emitting diodes (LEDs), mini LEDs, micro LEDs, organic light emitting diodes (OLEDs), etc., which are not limited here.

[0038] The backlight module of this embodiment is a side-entry backlight. By setting a light guide plate 20, the light emitted by the light source 10 can be refracted or reflected to the display panel and emitted as a whole. The light source 10 is located on the side of the light incident surface of the light guide plate 20. The light guide plate 20 includes a light incident surface for the light emitted by the light source 10, a light exit surface for emitting the light, a first reflective surface opposite to the light exit surface, and a second reflective surface connecting the first reflective surface and the light exit surface. The light emitting side of the light source 10 faces the light incident surface of the light guide plate 20. Figure 2 In the direction shown, the left side of the light guide plate 20 is the light incident surface, the top side is the light emitting surface, the bottom side of the light guide plate 20 is the first reflection surface, and the other sides are the second reflection surfaces, that is, the side close to the light source 10 among the four sides of the light guide plate 20 is the light incident surface, and the other three sides are the second reflection surfaces.

[0039] The base material of the light guide plate 20 can be made of, but not limited to, glass, acrylic, polycarbonate (PC), etc., and dots are set on the bottom surface of the base material using techniques such as laser engraving, V-shaped cross grid engraving, and UV screen printing. By rationally designing the density, size, and shape of the dots, the light emitted by the light source 10 can be reflected or refracted by the dots and then uniformly emitted from the top surface of the base material. The specific structure and arrangement of the dots can be designed according to product requirements. When designing the dots in the embodiment of the present disclosure, the brightness of the surrounding areas cannot be reduced, but rather the brightest point is ensured to be at the center of the module, and the brightness of the center point is 10 to 15% higher than the specification value, thereby improving the pass rate of the weight test.

[0040] The surface of the light guide plate 20 is also provided with an optical film layer, including a reflective film layer arranged on the bottom side of the light guide plate 20, that is, the first reflective surface, and a diffusion film layer, a lower light-enhancing film layer and an upper light-enhancing film layer arranged in sequence on the top side of the light guide plate 20, that is, the light-emitting surface. The optical film layer allows the light emitted by the light source 10 to be evenly irradiated to the liquid crystal panel.

[0041] The back panel 30 includes a base plate 31 and a frame 32 connected to the edge of the base plate 31. The frame 32 can be formed by bending the edge of the base plate 31. The light source 10 and the light guide plate 20 are arranged in the space formed by the back panel 30. The back panel 30 is used to support and accommodate the light source 10, the light guide plate 20, and the optical film layer. The light guide plate 20 is placed on the base plate 31.

[0042] A support structure 40 is provided on the side of the bottom plate 31 that is located away from the light incident surface of the light guide plate 20 and near the frame 32. The support structure 40 includes a reinforcing rib 41 provided on the surface of the bottom plate 31 and a support sheet 42 provided corresponding to the reinforcing rib 41. That is, the support structure 40 is close to the edge of the side of the bottom plate 31 away from the light source 10 and extends along the edge of the side of the bottom plate 31. The reinforcing rib 41, the groove, and the support sheet 42 are all in the shape of an elongated strip. One side of the surface of the bottom plate 31 is raised to form the reinforcing rib 41, and the other side of the surface of the bottom plate 31 is correspondingly recessed to form a groove, and the support sheet 42 is attached to the groove. In other words, the reinforcing member 41 and the groove are provided in correspondence with each other, and the two are respectively provided on the two side surfaces of the bottom plate 31. During the processing, the bottom plate 31 is stamped using a stamping process, thereby simultaneously forming the reinforcing rib 41 and the groove on the two side surfaces of the bottom plate 31, and then the support sheet 42 is attached to the groove.

[0043] The back panel 30 and light guide plate 20 are typically rectangular plates with four sides, one of which is provided with a light source 10. During a weight test, the side facing the light source 10 is the side of the module with the weakest rigidity, meaning the side away from the light source 10 is less likely to pass the weight test. In the disclosed embodiment, a support structure 40 is provided on this side of the back panel 30. The support structure 40 includes reinforcing ribs 41 and support sheets 42 that significantly increase the rigidity of this side of the back panel 30, thereby improving the module's ability to resist elastic deformation when subjected to stress. This increases the rigidity of the liquid crystal module on the side away from the light source 10, effectively preventing stress-induced light leakage from the liquid crystal module and thereby improving its pass rate in the weight test.

[0044] In one example, if Figure 3 As shown, the base plate 31 has a first surface and a second surface that are relatively arranged. The first surface is the side surface of the base plate 31 close to the light guide plate 20, and the second surface is the side surface of the base plate 31 away from the light guide plate 20. The reinforcing rib 41 is formed on the second surface, and the groove is formed on the first surface. The support sheet 42 is attached to the groove and is located on the inner side of the base plate 31.

[0045] The depth of the groove ranges from 0.08 mm to 0.15 mm, and the width of the groove ranges from 10 mm to 15 mm. The support sheet 42 is attached to the inside of the groove by double-sided adhesive, and the sum of the thicknesses of the double-sided adhesive and the support sheet 42 is 0.01 mm to 0.03 mm smaller than the depth of the groove. The width of the support sheet 42 is slightly smaller than the width of the groove, so that the support sheet 42 is completely accommodated in the groove. For example, a double-sided adhesive with a thickness of 0.01 mm to 0.03 mm is used to attach a support sheet 42 with a thickness of 0.05 mm to 0.12 mm in the groove. The material of the support sheet 42 can be a manganese steel sheet or a stainless steel sheet. This structure improves the overall stiffness of the backplane 30 without changing the requirements for the shape of the module in the overall assembly, increases the degree of downward bending deformation of the module under the action of the weight of the weights and its own gravity when placed on the side bracket fixtures on both sides, ensures the flatness of the display screen, and avoids stress light leakage.

[0046] In one example, as Figure 4 shown, the shapes of the reinforcing rib 41 and the groove are in a square shape, and they are arranged near the edge of the bottom plate 31. That is, reinforcing ribs 41 are provided at the four edges of the rectangular bottom plate 31. Among them, the shape of the support sheet 42 is strip-shaped and is attached to the groove on the side away from the light incident surface of the light guide plate 20. By providing the reinforcing ribs 41 on the four side edges of the bottom plate 31, the rigidity of the four side edges of the backplane 30 is improved, and through the combined action of the reinforcing rib 41 and the support sheet 42, especially the rigidity of the side of the backplane 30 away from the light incident surface of the light guide plate 20 is improved. It should be noted that the widths of the reinforcing ribs 41 and the grooves at the four side edges can also be different. For example, since a light source 10 is provided on the light incident side of the light guide plate 20, to avoid interference with the light source 10, the widths of the reinforcing rib 41 and the groove on this side can be smaller than the widths of the reinforcing ribs 41 and the grooves on the other sides.

[0047] In one example, the shape of the support sheet 42 is also in a square shape, that is, support sheets 42 are provided in the grooves at the four side edges of the backplane 31, which can effectively increase the stiffness of the bent parts at the four corners of the backplane 31, making it easier to pass the four-corner weight pressing test.

[0048] In one example, as Figure 5 shown, support sheets 42 are also provided in the grooves on the side of the light incident surface of the light guide plate 20, that is, support sheets 42 are provided in the grooves on the opposite sides of the bottom plate 31 near the light incident surface of the light guide plate 20 and away from the light incident surface of the light guide plate 20, further improving the rigidity of the two sides of the backplane 30. The number of support sheets 42 in this structure is two, and their shapes are both strip-shaped. It can be understood that the widths of the two support sheets 42 can be different, and their shapes are adapted to the shape of the groove so that the support sheets 42 can be completely accommodated in the groove.

[0049] In one example, as Figure 6As shown, the support piece 42 is U-shaped, that is, the support piece 42 is provided in the groove on the side of the back plate 31 away from the light incident surface of the light guide plate 20 and on both sides of the light incident surface of the light guide plate 20.

[0050] In one example, as Figure 7 shown, the support piece 42 is also U-shaped, that is, the support piece 42 is provided in the groove on the side of the back plate 31 close to the light incident surface of the light guide plate 20 and on both sides of the light incident surface of the light guide plate 20. In this embodiment, the shape of the support piece 42 is the same as that of the support piece 42 in the previous embodiment, only the setting direction of the support piece 42 is opposite. It can be understood that the width of the reinforcing rib 41 and the groove on the side close to the light incident surface of the light guide plate 20 is smaller than the width of the reinforcing rib 41 and the groove on the other three sides, so that the width of the support piece 42 fitted in the groove on the side close to the light incident surface of the light guide plate 20 is smaller than the width of its two sides.

[0051] In one example, as Figure 8 shown, the shape of the reinforcing rib 41 and the groove is a square frame shape and is provided close to the edge of the bottom plate 31. That is to say, the reinforcing rib 41 is provided at the four edges of the rectangular bottom plate 31. The reinforcing rib 41 is formed on the surface of the bottom plate 31 away from the light guide plate 20, that is, the reinforcing rib 41 is formed on the second surface of the bottom plate 31. The support piece 42 is strip-shaped, fitted to the second surface of the bottom plate 31, and adjacent to the reinforcing rib 41 on the side opposite to the light incident surface of the light guide plate 20. In this structure, the length of the support piece 42 is equal to or slightly less than the length of the reinforcing rib 41 on this side, so that the support piece 42 can be close to the reinforcing rib 41 and fitted to the bottom plate 31, thereby achieving the effect of increasing the width of the reinforcing rib 41, and further improving the stiffness of this side edge of the back plate 30. In one example, as Figure 2 shown, the reinforcing rib 41 is formed on the first surface of the bottom plate 31, and the groove is formed on the second surface of the bottom plate 31. That is to say, the bottom plate 31 bulges towards the light guide plate 20 to form the reinforcing rib 41, and the support piece 42 is located outside the bottom plate 31. The support piece 42 of this structure can be covered by the circuit board 50 on this side, and has little influence on the appearance of the backlight module.

[0052] In one example, as Figure 9As shown, the reinforcing ribs 41 and grooves are shaped like a circle and are located near the edges of the bottom plate 31. In other words, the rectangular bottom plate 31 is provided with reinforcing ribs 41 on all four edges. The reinforcing ribs 41 are formed on the side of the bottom plate 31 facing away from the light guide plate 20, that is, on the second surface of the bottom plate 31. Two supporting pieces 42 are elongated, with one piece 42 attached to the groove on the side facing away from the light incident surface of the light guide plate 20, and the other piece 42 attached to the surface of the reinforcing rib 41 on the side facing the light incident surface of the light guide plate 20. In other words, the two supporting pieces 42 are located on the first and second surfaces of the bottom plate 31, respectively. Since the supporting piece 42 on the side facing the light incident surface of the light guide plate 20 is located on the second surface of the bottom plate 31, the supporting piece 42 on this side is located outside the backlight module, thus not affecting the light source within it. Furthermore, the support piece 42 on this side adheres to the surface of the reinforcing rib 41, which effectively increases the thickness of the reinforcing rib 41 and improves the rigidity of the backplate 30 on that side. In this structure, the length of the support sheet 42 is equal to or slightly smaller than the length of the side reinforcement rib 41. By arranging the reinforcement ribs 41 on the four side edges of the bottom plate 31, the rigidity of the four side edges of the back plate 30 is improved. The rigidity of the back plate 30 away from and close to the light incident surface of the light guide plate 20 is especially improved through the joint action of the reinforcement ribs 41 and the support sheet 42.

[0053] A protective tape 80 is pasted on the edge of the display device close to the light incident surface of the light guide plate 20. The protective tape 80 is bent along the edge of the display device and wrapped around the surface of the bottom plate 31, so that the protective tape 80 can cover the support sheet 42 close to the light incident surface of the light guide plate 20, hiding the side support sheet 42.

[0054] When the weight of the backlight module meets the design requirements, the shape of the reinforcing rib 41 can be set to be rectangular, that is, most of the protrusions on the second surface of the base plate 31 are formed as reinforcing ribs 41, so that the shape of the groove is also rectangular. The shape of the supporting sheet 42 under this structure can be rectangular, 8-shaped or grid-shaped, so that the supporting sheet 42 can be accommodated in the rectangular groove.

[0055] The present invention also provides a display device. Figure 2 As shown, the display device includes the backlight module as described in the above embodiment and a display unit 60 located on the light-emitting side of the backlight module. The display device can have all the features and effects of the above backlight module, which will not be described again here.

[0056] The periphery of the display unit 60 is adhered to the back panel 30 via a light-shielding tape 70 so that the distance between the display unit 60 and the backlight module ranges from 0.04 mm to 0.05 mm. The light-shielding tape 70 is made of foam tape, which can buffer and absorb stress through deformation. Under the pressure of the weight test, it effectively supports the display unit 60, reduces the deformation of the display unit 60, and thus reduces the degree of light leakage.

[0057] In one example, the light-shielding tape 70 is a foam tape with a thickness of 0.11mm or 0.12mm. Its base material is PE foam, which has a compressible capacity and can buffer and absorb the stress of the downward deformation of the display unit 60, effectively alleviating the deformation of the display unit 60 and thus reducing the degree of light leakage. In addition, the display unit 60 on the side of the light source 10 can also be attached to the back panel 30 using the light-shielding tape 70.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A backlight module, characterized in that: Comprising: A light guide plate having a light emitting surface and a light incident surface, wherein the light incident surface is a side surface intersecting with the light emitting surface and for light to be incident; A light source disposed on one side of the light incident surface of the light guide plate and having a light emitting surface for emitting light to the light incident surface; A back plate having a bottom plate and a frame connected to the edge of the bottom plate, the back plate being used for accommodating the light guide plate and the light source, a support structure being provided on the side of the bottom plate away from the light incident surface of the light guide plate and near the frame, the support structure including reinforcing ribs provided on the surface of the bottom plate and support pieces correspondingly provided with the reinforcing ribs, the reinforcing ribs being formed by protruding from the surface of the bottom plate, a groove being formed by recessing on the surface of the bottom plate away from the reinforcing ribs, and the support pieces being attached to the inside of the groove; 2. The backlight module according to claim 1, wherein: The bottom plate has a first surface and a second surface disposed opposite to each other, the first surface being close to the light guide plate, the reinforcing ribs being formed on the second surface, and the groove being formed on the first surface; 3. The backlight module according to claim 2, wherein: The depth of the groove ranges from 0.08 mm to 0.15 mm, and the width of the groove ranges from 10 mm to 15 mm; 4. The backlight module according to claim 3, wherein: The support pieces are attached to the inside of the groove by double-sided adhesive, and the sum of the thicknesses of the double-sided adhesive and the support pieces is 0.01 mm to 0.03 mm smaller than the depth of the groove; 5. The backlight module according to claim 2, wherein: The shapes of the reinforcing ribs and the groove are in a shape of a rectangle with a hollow center, and are respectively provided close to the edge of the bottom plate; 6. The backlight module according to claim 5, wherein: The number of the support pieces is two, and they are respectively attached to the grooves on the side close to the light incident surface of the light guide plate and the side away from the light incident surface of the light guide plate; 7. The backlight module according to claim 5, wherein: The shape of the support piece is U-shaped, and is located on the side of the bottom plate away from the light incident surface of the light guide plate and in the grooves on both sides of the light incident surface of the light guide plate; 8. The backlight module according to claim 5, wherein: The shape of the support piece is in a shape of a rectangle with a hollow center, and is provided at the groove at the edge of the bottom plate; 9. The backlight module according to claim 2, wherein: The shapes of the reinforcing ribs and the groove are rectangular, and the shape of the support piece is rectangular, figure-eight-shaped, H-shaped or grid-shaped; 10. A display device, characterized in that: Comprising the backlight module according to any one of claims 1 to 9, and a display unit located on the light emitting side of the backlight module; 11. The display device according to claim 10, wherein: The edge of the display unit is attached to the back plate by a light-shielding tape, and the distance between the display unit and the backlight module ranges from 0.04 mm to 0.05 mm.

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