Backlight module and display device

Abstract

The utility model relates to a backlight module and a display device. The backlight module comprises a back plate and a plurality of light bars arranged on the back plate, the back plate comprises first concave parts and first convex parts which are arranged in a staggered mode in the preset direction, and the light bars are arranged on the bottom faces of the first concave parts. In the prior art, the light bar is arranged on the flat part connected with the reinforcing rib, and the concave part of the reinforcing rib is not fully utilized. The light bar is arranged in the first concave part, namely the reinforcing rib, so that the thickness of the backlight module is reduced.

Description

Technical Field

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

[0002] With the advancement of display technology, large-sized display devices are gradually used in production and life. However, large-sized display devices have poor strength and are prone to breakage. Therefore, in the related art, reinforcing ribs, i.e., grooves, are set on the back plate of the backlight module to improve the strength of the display device. However, the setting of the reinforcing ribs will increase the overall thickness of the display device. Thicker display devices increase packaging and transportation costs, and have poor aesthetics. Utility Model Content

[0003] The present application aims to provide a backlight module and a display device to solve the technical problem of large thickness of the display device in the related art.

[0004] In a first aspect, an embodiment of the present application proposes a backlight module, including a back panel and a plurality of light strips arranged on the back panel, wherein the back panel includes a first concave portion and a first convex portion staggered along a preset direction, and the light strip is arranged on the bottom surface of the first concave portion.

[0005] In a possible implementation manner, an angle between the side wall and the bottom surface of the first recess is an obtuse angle.

[0006] In a possible implementation, the bottom surface of the first recessed portion is raised in the light emitting direction to form a second raised portion, the height of the second raised portion is lower than the height of the first raised portion, and the light bar is arranged on the second raised portion.

[0007] In a possible implementation manner, the second convex portion is located in the middle of the first concave portion, so that the first concave portion is divided into two symmetrically distributed second concave portions.

[0008] In a possible implementation manner, the height of the second protrusion is 0.2-0.8 times the depth of the first concave portion.

[0009] In a possible implementation manner, the included angles between the bottom surface of the second recess and the two side walls are equal, and the included angle between the bottom surface of the second recess and the side wall is an obtuse angle or a right angle.

[0010] In a possible implementation manner, the angle between the side wall and the bottom surface of the second recess is in the range of 90°-150°.

[0011] In a possible implementation, a reflector is further included, the reflector includes a third concave portion and a third convex portion that are alternately arranged, the third convex portion is in contact with the first convex portion, the third concave portion is located between the light bar and the second convex portion, and is not in contact with the second concave portion.

[0012] In a possible implementation manner, a support column is further included, and the support column is arranged on the light emitting side of the first protrusion.

[0013] In a second aspect, an embodiment of the present application further proposes a display device, comprising: a display panel; and a backlight module as mentioned in the first aspect, arranged on one side of the backlight surface of the display panel, the backlight module being used to provide light source to the liquid crystal display panel.

[0014] The embodiment of the present application provides a backlight module and a display device, the backlight module includes a back plate and a plurality of light bars arranged on the back plate, the back plate includes a first concave portion and a first convex portion staggered along a preset direction, the light bar is arranged on the bottom surface of the first concave portion, and the preset direction is the length direction or the width direction of the back plate. That is, the light board is arranged in the reinforcing rib of the back plate, the space of the reinforcing rib is fully utilized, and the overall thickness is reduced while ensuring the pressure resistance of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The features, advantages and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the accompanying drawings, the same reference numerals are used for the same components. The accompanying drawings are not drawn according to the actual scale, but are only used to illustrate the relative position relationship. The layer thickness of some parts is exaggerated for easy understanding, and the layer thickness in the accompanying drawings does not represent the proportional relationship of the actual layer thickness.

[0016] Figure 1 A schematic diagram showing the structure of a backlight module in the related art is shown;

[0017] Figure 2 A schematic diagram showing the structure of a first backlight module provided in the first embodiment of the present application is shown;

[0018] Figure 3 A schematic diagram showing the structure of a second backlight module provided in the first embodiment of the present application is shown;

[0019] Figure 4 A schematic diagram showing the structure of a first display device provided in Embodiment 2 of the present application is shown;

[0020] Figure 5 A schematic structural diagram of a second display device provided in Embodiment 2 of the present application is shown.

[0021] Reference numerals:

[0022] 100. Display device;

[0023] 10. Backlight module;

[0024] 11. Back plate; 111. First concave part; 112. First convex part; 113. Second convex part; 114. Second concave part;

[0025] 12. Light bar;

[0026] 13. Reflective sheet; 131. Third concave portion; 132. Third convex portion;

[0027] 14. Support column;

[0028] 20. Display panel;

[0029] M. Reinforcement ribs. DETAILED DESCRIPTION

[0030] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the present application. However, it is obvious to those skilled in the art that the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating examples of the present application. In the accompanying drawings and the following description, at least part of the known structures and technologies are not shown to avoid unnecessary ambiguity in the present application; and, for clarity, the size of the regional structure may be exaggerated. In addition, the features, structures or characteristics described below may be combined in one or more embodiments in any suitable manner.

[0031] Figure 1 The schematic diagram of the structure of the backlight module in the related art is shown. In the related art, a reinforcing rib M is arranged on the outer side of the back plate of the backlight module, that is, a groove is formed on the inner side of the back plate 11, and the light bar 12 is arranged outside the groove. The reinforcing rib M can improve the strength of the display device, but the arrangement of the reinforcing rib will increase the overall thickness of the display device. A thicker display device increases the packaging and transportation costs, and has a poor appearance.

[0032] In view of this, an embodiment of the present application provides a backlight module and a display device, in which the light board is arranged in a groove formed by the reinforcing rib M on the inner side of the back plate 11, making full use of the recessed space of the reinforcing rib, thereby reducing its thickness while ensuring the overall strength of the display device.

[0033] The specific structures of the backlight module and the display device provided in each embodiment of the present application are described below in conjunction with the accompanying drawings.

[0034] First embodiment

[0035] Figure 2 A schematic structural diagram of a first backlight module 10 provided in the first embodiment of the present application is shown.

[0036] like Figure 2As shown, the first embodiment of the present application provides a backlight module 10, including a back panel 11 and a plurality of light strips 12 arranged on the back panel 11, the back panel 11 includes a first recess 111 and a first protrusion 112 staggered along a preset direction, and the light strip 12 is arranged on the bottom surface of the first recess 111.

[0037] The preset direction is the length direction or the width direction of the back plate 11 .

[0038] The material of the back plate 11 can be a metal material, such as any one of an aluminum plate, an aluminum alloy plate, or a galvanized steel, and is made by a process such as stamping. The metal material has good ductility and can protect the display substrate from being easily broken under the impact of external forces. The material of the back plate 11 can also be a plastic material, such as polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene, etc., to reduce the weight of the backlight module 10 and reduce the cost of the display substrate.

[0039] The light bar 12 may be a conventional-sized light-emitting diode (LED), or may be a micro-LED or a submillimeter light-emitting diode (Mini-LED). Micro-LED refers to an LED chip with a grain size of less than 100 microns, and Mini-LED refers to an LED chip with a grain size of about 100 to 300 microns. LED, Mini-LED or Micro-LED can be used as a self-luminous light-emitting element for display, and has the advantages of low power consumption, high brightness, high resolution, high color saturation, fast response speed, long life, and high efficiency.

[0040] In this embodiment, the staggered first concave portion 111 and the first convex portion 112 are arranged on the back plate 11 to improve the overall compression resistance of the back plate 11, that is, the first concave portion 111 can be regarded as the groove formed by the reinforcing rib M of the back plate 11 on the inner side of the back plate 11 in the related art, and the first convex portion 112 is equivalent to the flat portion of the back plate 11 connected to the reinforcing rib M in the related art. The light bar 12 in the related art is arranged on the flat portion connected to the reinforcing rib M, and the recessed portion of the reinforcing rib M is not fully utilized. However, in the present application, the light bar 12 is arranged in the first concave portion 111, that is, the groove formed by the reinforcing rib M on the inner side of the back plate 11. If the mixing distance is kept equal to that in the related art, the distance between the bottom of the first concave portion 111 and the display panel 20 can be set to the distance between the flat portion connected to the reinforcing rib M in the related art and the display panel 20, that is, the thickness of the backlight module 10 of the present application is compared with the backlight module 10 in the related art, and the depth of the recess of the reinforcing rib M in the related art is reduced. On the other hand, the present application can make the distance between the bottom of the first recess 111 and the display panel 20 greater than the distance between the flat part connected to the reinforcing rib M and the display panel 20 in the related art, and smaller than the distance between the bottom of the recess of the reinforcing rib M and the display panel 20. In this way, the thickness of the display device 100 can be reduced, and the light mixing distance can be appropriately increased to improve the uniformity of the emitted light, thereby improving the display effect.

[0041] In some embodiments, the angle between the side wall and the bottom surface of the first concave portion 111 is an obtuse angle. The angle between the side wall and the bottom surface of the first concave portion 111 is set to an obtuse angle, which can better disperse the force when the back plate 11 is subjected to the force in the light emitting direction or the backlight direction, thereby reducing the risk of damage to the backlight module 10.

[0042] In some embodiments, the bottom surface of the first concave portion 111 bulges toward the light emitting direction to form a second convex portion 113 . The height of the second convex portion 113 is lower than that of the first convex portion 112 . The light bar 12 is disposed on the second convex portion 113 .

[0043] Specifically, Figure 3 FIG. 1 is a schematic diagram showing the structure of a second backlight module 10 provided in the first embodiment of the present application. Figure 3 As shown, a second convex portion 113 is arranged in the first concave portion 111, and the light bar 12 is arranged on the second convex portion 113. When the back panel 11 is subjected to a force in the light emitting direction or the backlight direction, the first concave portion 111 and the second convex portion 113 can disperse the force, further increasing the shock absorbing effect of the backlight module 10.

[0044] In some embodiments, the second convex portion 113 is located in the middle of the first concave portion 111, so that the first concave portion 111 is divided into two symmetrically distributed second concave portions 114. This avoids the situation where one second convex portion 113 is located at the leftmost end of its corresponding first concave portion 111, and the other second convex portion 113 is located at the rightmost end of its corresponding first concave portion 111, and the distances between any two light bars 12 are unequal. This avoids the situation where the brightness of the light output is uneven due to the unequal distances between any two light bars 12. On the other hand, the second convex portion 113 is set to the middle of the first concave portion 111, so that two symmetrically distributed second concave portions 114 are formed on both sides of the second convex portion 113, and the two second concave portions 114 are symmetrically distributed, further enhancing the pressure resistance of the backlight panel.

[0045] In some embodiments, the height of the second convex portion 113 is 0.2-0.8 times the depth of the first concave portion 111. Within this range, the light mixing distance can be increased to improve the display effect, the thickness of the backlight module 10 can be reduced, and the side wall of the first concave portion 111 can be ensured not to block the light emitted by the light board.

[0046] In some embodiments, the angles between the bottom surface of the second recess 114 and the two side walls are equal, and the angles between the bottom surface of the second recess 114 and the side walls are obtuse or right angles. On the one hand, if the angles between the bottom surface of the second recess 114 and the two side walls are not equal, when the back plate 11 is squeezed, the smaller angle of the two angles is prone to breakage, so the angles between the bottom surface of the second recess 114 and the two side walls are equal. On the other hand, the angles between the bottom surface of the second recess 114 and the side walls are obtuse or right angles. Compared with acute angles, setting them to obtuse or right angles can further increase their compression resistance.

[0047] Specifically, the angle between the side wall and the bottom surface of the second recess 114 is in the range of 90°-150°.

[0048] In some embodiments, a reflective sheet 13 is further included. The reflective sheet 13 includes a third concave portion 131 and a third convex portion 132 that are alternately arranged. The third convex portion 132 is in contact with the first convex portion 112 . The third concave portion 131 is located between the light bar 12 and the second convex portion 113 and is not in contact with the second concave portion 114 .

[0049] The reflective sheet 13 may be made of a plastic material, such as polyethylene terephthalate (PET), polycarbonate (PC), polystyrene (PS), etc. The reflective sheet 13 may also include a high reflective coating, such as titanium dioxide TiO2, applied to the plastic material to increase the light reflectance.

[0050] The third convex portion 132 of the reflector sheet 13 is fitted with the first convex portion 112 of the back plate 11 to fix the reflector sheet 13 and prevent it from moving. The third concave portion 131 of the reflector sheet 13 is only fitted with the second convex portion 113 but not with the second concave portion 114, that is, the surface area of ​​the third concave portion 131 in the reflector sheet 13 is smaller than the sum of the surface areas of the second concave portion 114 and the second convex portion 113, thereby achieving light reflection and reducing the consumables of the reflector sheet 13, saving costs. In addition, the production process of the reflector sheet 13 can be simplified, the production cost can be reduced, and the reflection optical path of the light can be shortened, which is conducive to light reflection.

[0051] In other embodiments, a silicone pad (not shown in the figure) or a rubber pad (not shown in the figure) is provided between the reflective sheet 13 and the second concave portion 114, and the upper surface of the silicone pad or the rubber pad is flush with the upper surface of the second convex portion 113. By providing the silicone pad or the rubber pad, the stability of the installation of the reflective sheet 13 is improved. The upper surface of the silicone pad or the rubber pad is flush with the upper surface of the second convex portion 113, which can reduce the bending of the reflective sheet 13, simplify the process, and does not block the light emitted by the light board.

[0052] In some embodiments, a support column 14 is further included, and the support column 14 is disposed on the light-emitting side of the first protrusion 112. In the present application, the thickness of the backlight module 10 is reduced, so the height of the support column can be reduced.

[0053] Among them, the support column 14 is an elastic column that can be extended and retracted along its own axis. Optionally, the support column 14 is an elastic pin with a spring inside, which can be extended and retracted as the light mixing distance changes. There are multiple support columns 14 to prevent the middle position of the optical control component from sinking inward due to its own gravity and affecting the light output effect. This backlight module 10 with multiple support columns 14 is particularly suitable for display devices of larger sizes, such as display devices of 67 inches or larger sizes.

[0054] In this embodiment, by setting the light board in the first concave portion 111, the concave area of ​​the reinforcing rib M is fully utilized to reduce the thickness of the backlight module 10. The second convex portion 113 is set in the first concave portion 111, and the light bar 12 is set on the second convex portion 113. Compared with the related art, the thickness of the backlight module 10 is reduced, which is conducive to the thinness of the product, and the compression resistance of the back plate 11 is increased to avoid easy breakage during transportation or daily use. At the same time, in this embodiment, the light bar 12 is set on the second convex portion 113, and the height of the second convex portion is 0.2-0.8 times the depth of the first concave portion, so that the distance between the second convex portion 113 and the display panel 20 is greater than the distance between the flat part connected to the reinforcing rib M and the display panel 20 in the related art, and is less than the distance between the bottom of the concave portion of the reinforcing rib M and the display panel 20, so that the thickness of the display device 100 can be reduced, and the light mixing distance can be appropriately increased to improve the uniformity of the emitted light, thereby improving the display effect.

[0055] In addition, the angle between the side wall and the bottom surface of the second concave portion 114 is set to be between 90° and 150°, which further increases the pressure resistance of the backlight module 10. In addition, the reflective sheet 13 is not attached to the second concave portion 114, that is, the area of ​​the reflective sheet 13 is smaller than the surface area of ​​the second concave portion 114, which reduces the consumables of the reflective sheet 13 and reduces the production cost while achieving light reflection. A silicone pad or a rubber pad can also be provided between the reflective sheet 13 and the second concave portion 114, and the upper surface of the silicone pad or the rubber pad is flush with the upper surface of the second convex portion 113, which improves the stability of the installation of the reflective sheet 13, reduces the bending of the reflective sheet 13, simplifies the process, and does not block the light emitted by the light board.

[0056] Second embodiment

[0057] The present application provides a display device 100 , including: a display panel 20 and a backlight module 10 as mentioned in the first embodiment, which is arranged on a backlight side of the display panel 20 , and the backlight module 10 is used to provide light source to the liquid crystal display panel 20 .

[0058] Figure 4 The structure diagram of the first display device 100 provided in the second embodiment of the present application is shown as follows: Figure 4 As shown, the light board is arranged in the first concave portion 111, and the concave area of ​​the reinforcing rib M is fully utilized to effectively reduce the thickness of the backlight module 10, which is conducive to making the product lighter and thinner.

[0059] Figure 5 A schematic diagram of the structure of a second display device 100 provided in the second embodiment of the present application is shown. Figure 5 As shown, a second convex portion 113 is provided in the first concave portion 111, and the light board is arranged on the second convex portion 113. Compared with the related art, the thickness of the backlight module 10 is reduced, which is conducive to the lightweight product, and the compression resistance of the back panel 11 is increased to avoid easy breakage during transportation or daily use.

[0060] It can be understood that the technical solutions of the backlight module provided in each embodiment of the present application can be widely used to provide light sources to various liquid crystal display panels, such as TN (Twisted Nematic) display panels, IPS (In-Plane Switching) display panels, VA (Vertical Alignment) display panels, and MVA (Multi-Domain Vertical Alignment) display panels.

[0061] It should be easily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0062] The term "layer" used in the text may refer to a material portion including an area with a certain thickness. A layer may extend over the entire underlying structure or overlying structure, or may have a range smaller than the range of the underlying or overlying structure. In addition, a layer may be an area of ​​a homogeneous or inhomogeneous continuous structure, the thickness of which is less than the thickness of the continuous structure. For example, a layer may be located between the top surface and the bottom surface of the continuous structure or between any paired lateral planes at the top surface and the bottom surface. A layer may extend laterally, vertically and / or along a tapered surface. A substrate substrate may be a layer, may include one or more layers therein, and / or may have one or more layers located thereon, above it and / or below it. A layer may include multiple layers. For example, an interconnect layer may include one or more conductors and a contact layer (forming contacts, interconnects and / or vias therein) and one or more dielectric layers.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A backlight module, comprising a back panel and a plurality of light bars arranged on the back panel, characterized in that: The back plate includes a first concave portion and a first convex portion which are staggered along a preset direction, and the light bar is arranged on the bottom surface of the first concave portion.

2. The backlight module according to claim 1, characterized in that: An included angle between the side wall of the first recess and the bottom surface is an obtuse angle.

3. The backlight module according to claim 1, characterized in that: The bottom surface of the first concave portion is raised toward the light emitting direction to form a second convex portion. The height of the second convex portion is lower than that of the first convex portion. The light bar is arranged on the second convex portion.

4. The backlight module according to claim 3, characterized in that: The second convex portion is located in the middle of the first concave portion, so that the first concave portion is divided into two symmetrically distributed second concave portions.

5. The backlight module according to claim 3, characterized in that: The height of the second convex portion is 0.2-0.8 times the depth of the first concave portion.

6. The backlight module according to claim 4, characterized in that: The included angles between the bottom surface of the second concave portion and the two side walls are equal, and the included angle between the bottom surface of the second concave portion and the side wall is an obtuse angle or a right angle.

7. The backlight module according to claim 6, characterized in that: The included angle between the side wall and the bottom surface of the second recess is in the range of 90°-150°.

8. The backlight module according to claim 4, characterized in that: It also includes a reflector sheet, which includes a third concave portion and a third convex portion that are alternately arranged, the third convex portion is in contact with the first convex portion, the third concave portion is located between the light bar and the second convex portion, and is not in contact with the second concave portion.

9. The backlight module according to claim 1, characterized in that: It also includes a support column, which is arranged on the light-emitting side of the first protrusion.

10. A display device, characterized in that: include: Display panel; and The backlight module according to any one of claims 1 to 9 is arranged on a backlight surface side of the display panel, and the backlight module is used to provide light source to the display panel.

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