Backlight module and display device

Abstract

The application provides a backlight module and a display device, and relates to the technical field of display, which is used to at least alleviate the problem of backlight module edge darkening in the related art. The backlight module comprises a frame, a light guide plate, an optical film and a port adhesive. The frame comprises a first surface and a second surface. The light guide plate is supported on the first surface. The optical film is supported on the light guide plate. One end of the port adhesive is located on the optical film, and the other end is connected with the second surface. The port adhesive comprises a light reflection layer. The light reflection layer has an overlap with the orthographic projection of the optical film on the first surface.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a backlight module and display device. Background Technology

[0002] In the technological development of LCD products, the brightness uniformity of the displayed image is one of the key indicators affecting the visual experience. However, current mainstream LCD products generally face the problem of dark edges and bright centers in the backlight module design and application, which in turn leads to defects such as dark lines and vignetting, seriously affecting the overall uniformity of the displayed image and reducing the user's viewing experience. Utility Model Content

[0003] This application provides a backlight module and a display device to at least alleviate the problem of dark edges in backlight modules in related technologies.

[0004] On one hand, embodiments of this application provide a backlight module, the backlight module comprising: The frame includes a first surface and a second surface; A light guide plate is supported on the first surface; An optical film, supported on the light guide plate; and The adhesive tape has one end located on the optical film and the other end connected to the second surface. The adhesive tape includes a reflective layer, and the orthographic projection of the reflective layer on the first surface overlaps with the orthographic projection of the optical film on the first surface.

[0005] In some embodiments, the adhesive tape is located around the optical diaphragm.

[0006] In some embodiments, the adhesive includes a contact surface that contacts the optical film, and the orthographic projection of the reflective layer on the first surface overlaps with the orthographic projection of the contact surface on the first surface.

[0007] In some embodiments, the adhesive tape further includes a light-shielding layer located on the side of the reflective layer opposite to the optical film.

[0008] In some embodiments, the light-shielding layer is a first ink layer, which is in contact with the reflective layer.

[0009] In some embodiments, the backlight module further includes a light source supported on the first surface and located on one side of the light guide plate; the adhesive includes a first portion and a second portion, a first gap is provided between the second portion and the first portion, and the extension direction of the second portion intersects the extension direction of the first portion, the first portion covers the light source; the optical film includes a first diffuser plate in contact with the light guide plate, a second ink layer is provided on the first diffuser plate, and the orthographic projection of the second ink layer on the first surface covers the orthographic projection of the first gap on the first surface.

[0010] In some embodiments, the first diffusion plate includes a main body and a first extension located on one side of the main body, the orthographic projection of the first extension on the first surface covering the orthographic projection of the first gap on the first surface, and the second ink layer being at least partially disposed on the first extension.

[0011] In some embodiments, the second ink layer includes a first light-shielding portion and a second light-shielding portion connected to each other, the first light-shielding portion extending in the same direction as the first portion extending, the first light-shielding portion covering the edge of the main body portion near the first extension portion, and the second light-shielding portion covering the first extension portion.

[0012] In some embodiments, the adhesive further includes a third portion disposed opposite to the second portion, the third portion and the first portion having a second gap; the first diffusion plate includes a main body portion and a second extension portion located on one side of the main body portion, the orthographic projection of the second extension portion on the first surface covering the orthographic projection of the second gap on the first surface, and the second ink layer portion being disposed on the second extension portion.

[0013] On the other hand, embodiments of this application also provide a display device, which includes a backlight module as described in any of the above embodiments.

[0014] In the backlight module provided in this embodiment, since the adhesive includes a reflective layer, and the orthographic projection of the reflective layer on the first surface overlaps with the orthographic projection of the optical film on the first surface, light emitted from the periphery of the optical film is reflected by the reflective layer. This allows this portion of the light to be reused, thereby improving the light energy utilization rate of the backlight module. Furthermore, this reflected light also exits from the edge of the reflective layer, increasing the edge light output of the backlight module and effectively improving the problem of insufficient light intensity in the edge area, resulting in edge darkness. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of a backlight module provided in some embodiments of this application; Figure 2 This is a cross-sectional view of a backlight module provided in some other embodiments of this application; Figure 3 This is a top view of a backlight module provided in some embodiments of this application; Figure 4 yes Figure 3 A top view of a portion of the structure within area A in the middle; Figure 5 This is a schematic diagram showing the relative positional relationship between the first diffusion plate and the second ink layer according to some embodiments of this application; Figure 6 This is a cross-sectional view of a display device provided in some embodiments of this application. Detailed Implementation

[0017] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings. The described technical solutions are for illustrative purposes only and should not be construed as limiting the scope of protection of this application.

[0018] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different technical features. The term "multiple" and similar words indicate two or more unless otherwise expressly defined. The term "connected to B" can refer to a direct connection between A and B, or an indirect connection between A and B through an intermediary.

[0019] In this application, the descriptions of the various embodiments each have their own emphasis. Parts not described in detail in a particular embodiment can be found in the relevant descriptions of other embodiments. The embodiments, implementation methods, examples, and related technical features of this application can be combined and substituted for each other without conflict.

[0020] In related technologies, backlight modules commonly face the problem of dark edges and overly bright centers during product design and application. For example, backlight modules typically include a black vinyl frame, which absorbs light from the edge areas of the backlight module, reducing the light intensity at the edges. This results in a significant brightness difference between the edge and center areas, ultimately manifesting as dark edges and potentially causing dark lines. Furthermore, backlight modules usually include a light guide plate. To meet the product's brightness requirements in the center area, the dot density of the light guide plate must be concentrated in the center to ensure brightness output. This leads to insufficient dot density at the edges, resulting in poor light transmission and uniform light distribution at the edges, further causing insufficient light intensity and dark edges.

[0021] Based on this, some embodiments of this application provide a backlight module and a display device including the backlight module.

[0022] like Figure 1 and Figure 2 As shown, the backlight module 100 includes a frame 10, a light guide plate 20, an optical film 30, and adhesive tape 40. The frame 10 includes a first surface 101 and a second surface 102; the light guide plate 20 is supported on the first surface 101; the optical film 30 is supported on the light guide plate 20. One end of the adhesive tape 40 is located on the optical film 30, and the other end is connected to the second surface 102. The adhesive tape 40 includes a reflective layer 41, and the orthographic projection of the reflective layer 41 on the first surface 101 overlaps with the orthographic projection of the optical film 30 on the first surface 101.

[0023] In the backlight module 100 provided in this embodiment, since the adhesive 40 includes a reflective layer 41, and the orthographic projection of the reflective layer 41 onto the first surface 101 overlaps with the orthographic projection of the optical film 30 onto the first surface 101, light emitted from the periphery of the optical film 30 is reflected by the reflective layer 41. This allows this portion of light to be reused, thereby improving the light energy utilization rate of the backlight module 100. Furthermore, this reflected light also exits from the edge of the reflective layer 41, increasing the edge light emission of the backlight module 100 and effectively improving the problem of insufficient light intensity in the edge area of ​​the backlight module, resulting in edge darkness.

[0024] The backlight module and display device provided in this application will be described below with reference to specific embodiments, which are described in detail below.

[0025] Some embodiments of this application provide a backlight module, such as Figure 1 and Figure 2 As shown, the backlight module 100 includes a frame 10, a light guide plate 20, an optical film 30, and adhesive 40.

[0026] The frame 10 includes a first surface 101 and a second surface 102, and there may be a step difference between the first surface 101 and the second surface 102. For example, the frame 10 may include a back plate 12 and a plastic frame 11 connected to the back plate 12, with the first surface 101 located on the back plate 12 and the second surface 102 located on the plastic frame 11.

[0027] A light guide plate 20 is disposed on a first surface 101, which provides support for the light guide plate 20. An optical film 30 is disposed on the light guide plate 20, which also provides support for the optical film 30. As an example, the light guide plate 20 and the optical film 30 are sequentially stacked on the first surface 101. One end of an adhesive 40 is located on the optical film 30, and the other end of the adhesive 40 is connected to the second surface 102.

[0028] In this embodiment, the backlight adhesive 40 includes a reflective layer 41, the orthographic projection of which overlaps with the orthographic projection of the optical film 30 on the first surface 101. In this case, light emitted from the periphery of the optical film 30 is reflected by the reflective layer 41, thus allowing this portion of the light to be reused, thereby improving the light energy utilization rate of the backlight module 100. Furthermore, this reflected light also exits from the edge of the reflective layer 41, thereby increasing the edge light output of the backlight module 100, effectively improving the problem of insufficient light intensity in the edge area of ​​the backlight module and resulting in edge darkening.

[0029] In some examples, one end of the adhesive tape 40 overlaps the optical film 30. This prevents the adhesive tape 40 from sticking to the optical film 30, so that when the backlight module 100 is reworked, removing the adhesive tape 40 will not damage the optical film 30, thus avoiding the problem of damage to the optical film 30 due to the removal of the adhesive tape 40 during the rework of the backlight module 100.

[0030] In some embodiments, adhesive 40 is disposed on at least one side of the optical diaphragm 30.

[0031] For example, the adhesive 40 is located around the optical film 30. In this case, the reflective layer 41 in the adhesive 40 can reflect the light around the optical film 30, thereby increasing the light output at the edges of the backlight module 100, thus effectively improving the problem of insufficient light intensity at the edges of the backlight module and resulting in dark edges.

[0032] In some embodiments, please continue reading Figure 1 and Figure 2 The adhesive 40 includes a contact surface 401 that contacts the optical film 30, and the orthographic projection of the reflective layer 41 on the first surface 101 overlaps with the orthographic projection of the contact surface 401 on the first surface 101.

[0033] In this case, the shape and size of the reflective layer 41 in the horizontal cross section are the same as those of the contact surface 401. This allows the reflective layer 41 to have a larger area to reflect light emitted from the periphery of the optical film 30, thereby effectively improving the light energy utilization of the backlight module 100 and the light emission effect at the edge of the backlight module 100.

[0034] In some examples, the reflective layer 41 is in contact with the optical film 30, and the contact surface 401 is the surface on which the reflective layer 41 contacts the optical film 30.

[0035] In some embodiments, such as Figure 2 As shown, the adhesive 40 also includes an adhesive layer 42, which is connected to the second surface 102.

[0036] In some examples, the adhesive layer 42 extends from one end of the second surface 102 onto the optical film 30. For example, a reflective layer 41 is disposed on the side of the adhesive layer 42 near the optical film 30, in which case the reflective layer 41 overlaps the optical film 30. The reflective surface of the reflective layer 41 faces the optical film 30 to reflect light emitted from the periphery of the optical film 30. Alternatively, the reflective layer 41 is disposed on the side of the adhesive layer 42 away from the optical film 30, in which case the reflective layer 41 is connected to the optical film 30 via the adhesive layer 42. The adhesive layer 42 may be made of a transparent material to ensure that light can pass through the adhesive layer 42 and be reflected by the reflective layer 41.

[0037] It is worth noting that the reflective surface of the reflective layer 41 is always located on the side of the reflective layer 41 closest to the optical film 30, so as to ensure that the reflective layer 41 reflects the light emitted from the periphery of the optical film 30.

[0038] In some examples, the reflective layer 41 includes a substrate and a reflective coating on the surface of the substrate. This facilitates the fabrication of the reflective layer 41. The reflective layer 41 can be cut using a reflective sheet, and then the cut reflective sheet can be glued onto the adhesive layer 42 to form the adhesive 40.

[0039] As an example, the substrate can be polyethylene terephthalate, and the reflective coating can be titanium dioxide.

[0040] In some examples, the reflective layer 41 may also extend from one end of the second surface 102 onto the optical film 30, and the reflective layer 41 is connected to the second surface 102 via the adhesive layer 42. In this case, an adhesive layer may also be provided on the side of the reflective layer 41 facing away from the adhesive layer 42, and the adhesive layer is used to connect the liquid crystal display panel above to achieve the fixation of the liquid crystal display panel.

[0041] As an example, one of the adhesive layer 42 and the bonding layer can be made of foam, which can provide good cushioning and shock absorption to protect the liquid crystal display panel.

[0042] In some embodiments, please continue reading Figure 2 The adhesive 40 also includes a light-shielding layer 43 located on the side of the reflective layer 41 opposite to the optical film 30.

[0043] The light-shielding layer 43 can effectively block light from emanating from the periphery of the optical film 30, thereby preventing light leakage at the edge of the backlight module 100 and improving the display contrast of the display device to which the backlight module 100 is used.

[0044] In some examples, the orthographic projection of the light-shielding layer 43 on the first surface 101 overlaps with the orthographic projection of the reflective layer 41 on the first surface 101, thereby ensuring that the light-shielding layer 43 has a relatively large area to cover the edge position of the optical film 30.

[0045] In some examples, the light-shielding layer 43 is the first ink layer, and the first ink layer is in contact with the reflective layer 41. In this case, the light-shielding layer 43 can be screen-printed onto the reflective layer 41 to achieve the light-shielding effect. This configuration simplifies the manufacturing process of the light-shielding layer 43, reduces manufacturing costs, and ensures that the light-shielding layer 43 has a relatively good light-shielding effect.

[0046] It is worth noting that when the reflective layer 41 includes a substrate and a reflective coating on the surface of the substrate, the reflective coating and the light-shielding layer 43 are located on opposite sides of the substrate.

[0047] In some embodiments, such as Figure 3 As shown, the backlight module 100 also includes a light source 50 supported on the first surface 101 and located on one side of the light guide plate 20. The light source 50 may include a circuit board 51 and a light-emitting device 52 electrically connected to the circuit board 51. The light emitted by the light-emitting device 52 enters the light guide plate 20 and exits from the light-emitting surface of the light guide plate 20, thereby transforming the point light source into a surface light source and ensuring the uniformity of light emission from the backlight module 100.

[0048] In some examples, the light guide plate 20 is also provided with a reflective sheet 21 on the side near the frame 10. The reflective sheet 21 can effectively improve the light energy utilization of the backlight module 100.

[0049] In some examples, such as Figure 4As shown, the backlight 40 includes a first portion 40A and a second portion 40B, with the first portion 40A covering the light source 50. That is, the first portion 40A is located on one side of the light source 50 (also called the ground side). A first gap F exists between the second portion 40B and the first portion 40A, and the extending direction of the second portion 40B intersects the extending direction of the first portion 40A. For example, the first portion 40A extends along a first direction X, and the second portion 40B extends along a second direction Y, with the first direction X and the second direction Y being perpendicular to each other. Because of the first gap F between the second portion 40B and the first portion 40A, light emitted from the light source 50 can easily leak through this first gap F, causing the backlight module 100 to easily exhibit bright or dark corners, thus affecting the display effect of the display device.

[0050] In this embodiment, as Figure 5 As shown, the optical film 30 includes a first diffuser plate 31 that contacts the light guide plate 20. A second ink layer 310 is provided on the first diffuser plate 31. The orthographic projection of the second ink layer 310 on the first surface 101 covers the orthographic projection of the first gap F on the first surface.

[0051] In this case, the second ink layer 310 can block the first gap F and absorb the light passing through the area, thereby effectively preventing light from leaking from the first gap F and causing the backlight module 100 to have bright or dark corners.

[0052] In some examples, the first diffuser plate 31 includes a main body 311 and a first extension 312 located on one side of the main body 311. The orthographic projection of the first extension 312 on the first surface 101 covers the orthographic projection of the first gap F on the first surface 101. The second ink layer 310 is at least partially disposed on the first extension 312. For example, the second ink layer 310 can be printed on the first diffuser plate 31 at corresponding positions by screen printing.

[0053] In this case, the first extension 312 can be extended according to the shape and size of the first gap F, and then the second ink layer 310 can be provided on the first extension 312 to block the light in the area where the first gap F is located.

[0054] Optionally, the horizontal cross-sectional shape of the main body 311 can be a regular geometric shape, such as a rectangle, a rounded rectangle, etc.

[0055] Optionally, the horizontal cross-sectional shape of the first extension 312 can be a polygon, such as a pentagon, so that the first extension 312 has a relatively large area to improve the light blocking effect in the area where the first gap F is located.

[0056] In some examples, the second ink layer 310 includes a first light-shielding portion 3101 and a second light-shielding portion 3102 connected to each other. The first light-shielding portion 3101 extends in the same direction as the first portion 40A. The first light-shielding portion 3101 covers the edge of the main body portion 311 near the first extension portion 312, and the second light-shielding portion 3102 covers the first extension portion 312.

[0057] With this configuration, the second ink layer 310 can form a relatively large coverage area on the first diffuser plate 31, which helps to avoid the problem of bright or dark lines appearing on the ground side.

[0058] In some examples, the adhesive 40 also includes a third portion disposed opposite to the second portion 40B, with a second gap between the third portion and the first portion 40A. The first diffuser plate 31 includes a main body 311 and a second extension 313 located on one side of the main body 311. The orthographic projection of the second extension 313 on the first surface 101 covers the orthographic projection of the second gap on the first surface 101, and the second ink layer 310 is partially disposed on the second extension 313.

[0059] For example, the second ink layer 310 further includes a third light-shielding portion 3103, and the third light-shielding portion 3103 covers the second extension portion 313.

[0060] In this case, the second ink layer 310 can effectively shield the area where the first gap and the second gap are located on the ground side, thereby helping to avoid the problem of bright or dark corners on the ground side.

[0061] It is worth noting that when the first extension 312 and the second extension 313 are installed, they need to avoid other components in the backlight module 100. Therefore, the first extension 312 may not contact the end of the main body 311 near the edge of the first extension 312.

[0062] In some embodiments, the optical film 30 further includes at least one prism sheet and a second diffuser sheet stacked sequentially on the side of the first diffuser plate 31 opposite to the light guide plate 20. The first diffuser plate 31 and the second diffuser plate can improve the uniformity of light and eliminate light spots. The prism sheet can be used to control the light emission direction and improve the light emission brightness of the backlight module 100.

[0063] Some embodiments of this application also provide a display device, such as... Figure 6 As shown, the display device 1000 includes the backlight module 100 described in any of the above embodiments.

[0064] Since it includes the backlight module 100, the display device 1000 has the technical effects of the backlight module 100 described above, which will not be repeated here.

[0065] In some examples, the display device 1000 further includes a liquid crystal display panel 200. The liquid crystal display panel 200 includes an array substrate and a color filter substrate disposed opposite to each other. A lower polarizer is provided on the side of the array substrate opposite to the color filter substrate, and an upper polarizer is provided on the side of the color filter substrate opposite to the array substrate.

[0066] Optionally, the display device 1000 can be applied to and used in a variety of products, including, for example, televisions, laptop computers, monitors, billboards, Internet of Things (IoT) devices, and portable electronic devices including mobile phones, smartphones, tablet computers, mobile communication terminals, electronic notebooks, e-books, portable multimedia players (PMPs), navigation devices, and ultra-mobile personal computers (UMPCs).

[0067] Furthermore, the display device 1000 according to some embodiments can be applied to wearable devices and can be used within wearable devices, including smartwatches, watch phones, glasses-type displays, and head-mounted displays (HMDs). Additionally, according to some embodiments, the display device 1000 can be applied to instrument panels for automobiles, displays in central dashboards or central information displays (CIDs) arranged on instrument panels, interior mirror displays replacing side mirrors, and displays for entertainment systems arranged on the back of the front seats for rear-seat passengers in automobiles.

[0068] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A backlight module, characterized in that, include: The frame includes a first surface and a second surface; A light guide plate is supported on the first surface; An optical film is supported on the light guide plate; as well as The adhesive tape has one end located on the optical film and the other end connected to the second surface. The adhesive tape includes a reflective layer, and the orthographic projection of the reflective layer on the first surface overlaps with the orthographic projection of the optical film on the first surface.

2. The backlight module of claim 1, wherein, The adhesive tape is located around the optical film.

3. The backlight module of claim 1, wherein, The adhesive includes a contact surface that contacts the optical film, and the orthographic projection of the reflective layer on the first surface overlaps with the orthographic projection of the contact surface on the first surface.

4. The backlight module of claim 1, wherein, The adhesive also includes a light-shielding layer located on the side of the reflective layer opposite to the optical film.

5. The backlight module of claim 4, wherein, The light-shielding layer is a first ink layer, and the first ink layer is in contact with the reflective layer.

6. The backlight module of any one of claims 1-5, wherein, The backlight module also includes a light source supported on the first surface and located on one side of the light guide plate; The adhesive tape includes a first part and a second part, with a first gap between the second part and the first part, and the extending direction of the second part intersects the extending direction of the first part, and the first part covers the light source; The optical film includes a first diffuser plate in contact with a light guide plate, and a second ink layer is provided on the first diffuser plate. The orthographic projection of the second ink layer on the first surface covers the orthographic projection of the first gap on the first surface.

7. The backlight module of claim 6, wherein, The first diffusion plate includes a main body and a first extension located on one side of the main body. The orthographic projection of the first extension on the first surface covers the orthographic projection of the first gap on the first surface. The second ink layer is at least partially disposed on the first extension.

8. The backlight module of claim 7, wherein, The second ink layer includes a first light-shielding portion and a second light-shielding portion connected to each other. The first light-shielding portion extends in the same direction as the first portion. The first light-shielding portion covers the edge of the main body portion near the first extension portion, and the second light-shielding portion covers the first extension portion.

9. The backlight module of claim 6, wherein, The adhesive also includes a third part disposed opposite to the second part, and a second gap is provided between the third part and the first part; The first diffusion plate includes a main body and a second extension located on one side of the main body. The orthographic projection of the second extension on the first surface covers the orthographic projection of the second gap on the first surface. The second ink layer is partially disposed on the second extension.

10. A display device, characterized by comprising: include: The backlight module as described in any one of claims 1-9.

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