Backlight module and display device

Abstract

The invention provides a backlight module and a display device, the backlight module comprises a lamp panel, a reflecting cover, an adhesive double-sided adhesive layer and a shading double-sided adhesive layer, the reflecting cover is mounted on the lamp panel, the adhesive double-sided adhesive layer and the shading double-sided adhesive layer are used for adhering the lamp panel and the reflecting cover, and the lamp panel is provided with at least one first light-emitting element and at least one second light-emitting element. The second light-emitting element is located on the outer side of the first light-emitting element, the first light-emitting element and the second light-emitting element can be independently lightened, the adhesion double-sided adhesive layer is at least located between the first light-emitting element and the shading double-sided adhesive layer, and the shading double-sided adhesive layer is at least located between the first light-emitting element and the second light-emitting element. The adhesive double-sided adhesive layer is used for pulling the central area of the lamp panel and the reflecting cover, and the shading double-sided adhesive layer is used for pulling the edge area of the lamp panel and the reflecting cover, so that the deformation amount of the lamp panel and the reflecting cover is consistent as far as possible, gaps are avoided, and even if the gaps are generated, the shading double-sided adhesive layer can expand to fill the gaps. Therefore, the problems of light leakage and optical crosstalk are avoided.

Description

Technical Field

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

[0002] At present, LED display technology is widely used in display devices. With the rapid development of LED display technology, consumers' requirements for display devices are getting higher and higher. The backlight module is an important component of the display device. Its main function is to provide the display device with sufficient brightness and evenly distributed light source so that the display device can display normally. According to the location of the light source, the backlight module is mainly divided into direct-type and side-entry type. The side-entry backlight module distributes the LED lamp beads on the side, which is prone to uneven light control, so the display effect is relatively poor; the direct-type backlight module arranges the LED lamp beads on the front of the back panel. Compared with the side-entry backlight module, the light distribution is more even and the light control is better, resulting in better display effect.

[0003] In direct-lit backlight modules, when the density of LED beads is low, the light generated by the LED beads diffuses in all directions, resulting in poor directivity. This makes cross-talk and light leakage issues more likely to occur during zoned displays. Therefore, reflective covers are generally used to separate the LED beads, allowing the direct-lit backlight module to form multiple zoned display areas, fully utilizing the light emitted by each LED bead and improving display brightness. For example, in the case of miniLED LCD displays for automotive instruments, the main display area, signal light display area, and ambient light display area are all placed on a single screen, with the signal light display area and ambient light display area located outside the main display area. This simplifies assembly for the automaker and eliminates the need for separate development of signal lights and ambient lights. However, because different display areas require independent control and lighting, cross-talk and light leakage issues can occur when lighting a single display area in extremely dark conditions, affecting the driver's experience in the dark environment. Summary of the Invention

[0004] In view of this, the embodiments of the present application are directed to providing a backlight module and a display device to solve the problem of light crosstalk and light leakage between different display areas of the backlight module in the prior art.

[0005] On one hand, the present application provides a backlight module, comprising:

[0006] A light panel comprising at least one first light-emitting element and at least one second light-emitting element, wherein the second light-emitting element is located outside the first light-emitting element, and the first light-emitting element and the second light-emitting element can be lit independently;

[0007] a reflector, mounted on the light panel; and

[0008] The adhesive double-sided adhesive layer and the light-shielding double-sided adhesive layer are both located between the light board and the reflector to adhere the light board and the reflector. The adhesive double-sided adhesive layer is at least located between the first light-emitting element and the light-shielding double-sided adhesive layer. The light-shielding double-sided adhesive layer is at least located between the first light-emitting element and the second light-emitting element to isolate the first light-emitting element from the second light-emitting element. The thickness of the light-shielding double-sided adhesive layer when uncompressed is greater than the thickness of the adhesive double-sided adhesive layer.

[0009] In some embodiments, the light-shielding double-sided adhesive layer is in a compressed state, and the adhesive double-sided adhesive layer is in a compressed state.

[0010] In some embodiments, the adhesive double-sided adhesive layer has at least one first through hole, the first light-emitting element is located in the corresponding first through hole, and the light-shielding double-sided adhesive layer has at least one second through hole, the second light-emitting element is located in the corresponding second through hole.

[0011] In some embodiments, the color of the adhesive double-sided adhesive layer is transparent or white, and the color of the light-shielding double-sided adhesive layer is black.

[0012] In some embodiments, the material of the adhesive double-sided adhesive layer is VHB adhesive or foam adhesive, and the material of the light-shielding double-sided adhesive layer is VHB adhesive or foam adhesive.

[0013] In some embodiments, reinforcing ribs are provided on the surface of the reflector facing the light panel.

[0014] In some embodiments, the reflector has a first part, a second part and a third part, the first part corresponds to the area where the first light-emitting element is located, the second part corresponds to the area where the second light-emitting element is located, the third part is located outside the first part and the second part, and all or at least part of the reinforcement rib is set on the second part and / or the third part.

[0015] In some embodiments, the reinforcing rib is in at least one of a straight shape, a cross shape, an L shape, or an X shape.

[0016] In some embodiments, the first light-emitting element is a light-emitting element in a main display area of the backlight module, and the second light-emitting element is an ambient light and / or a signal light of the backlight module.

[0017] An embodiment of the present application further provides a display device, comprising the backlight module.

[0018] The present application provides a backlight module and a display device, comprising a lamp board, a reflector, an adhesive double-sided adhesive layer and a light-shielding double-sided adhesive layer, wherein the reflector is mounted on the lamp board, the adhesive double-sided adhesive layer and the light-shielding double-sided adhesive layer are located between the lamp board and the reflector to adhere the lamp board and the reflector, the lamp board comprises at least one first light-emitting element and at least one second light-emitting element, the second light-emitting element is located outside the first light-emitting element, the first light-emitting element and the second light-emitting element can be lit independently, the adhesive double-sided adhesive layer is at least located between the first light-emitting element and the light-shielding double-sided adhesive layer, the light-shielding double-sided adhesive layer is at least located between the first light-emitting element and the second light-emitting element to isolate the first light-emitting element from the second light-emitting element, and the thickness of the light-shielding double-sided adhesive layer when uncompressed is greater than the thickness of the adhesive double-sided adhesive layer. Since the deformation of the edge areas of the lamp board and the reflector cover is usually greater than that of the central area, and the second display area is located outside the first display area, it is equivalent to using the adhesive double-sided tape layer to pull the central area of the lamp board and the reflector cover, and using the shading double-sided tape layer to pull the edge areas of the lamp board and the reflector cover, so that the deformation of the lamp board and the reflector cover is as consistent as possible to avoid the generation of gaps.

[0019] Furthermore, the thickness of the light-shielding double-sided adhesive layer when uncompressed is greater than the thickness of the adhesive double-sided adhesive layer. Even if the deformation amounts of the lamp board and the reflector cover are inconsistent and a gap is generated, the light-shielding double-sided adhesive layer can expand to fill the gap, thereby avoiding light leakage and cross-light problems caused by the gap. At the same time, the compressed light-shielding double-sided adhesive layer can also be inserted into the circuit groove on the circuit board of the lamp board to fill the circuit groove, thereby avoiding light leakage and cross-light problems caused by the circuit groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the deformed reflector cover and light panel provided in one embodiment of the present application.

[0021] Figure 2 A partial schematic diagram of a light board provided in one embodiment of the present application.

[0022] Figure 3 This is an exploded view of a backlight module provided in one embodiment of the present application.

[0023] Figure 4 A schematic structural diagram of a light board provided in one embodiment of the present application.

[0024] Figure 5 A schematic diagram of the surface of the reflector facing the light panel provided in one embodiment of the present application.

[0025] Figure 6 A schematic diagram of the surface of the reflector facing away from the light panel provided in one embodiment of the present application.

[0026] Figure 7 This is a schematic structural diagram of a light-shielding double-sided adhesive layer provided in one embodiment of the present application.

[0027] Figure 8 Schematic diagram of the relative positions of the light-shielding double-sided adhesive layer and the reflective cover provided in one embodiment of the present application

[0028] Figure 9 This is a schematic diagram of the backlight module during the preparation process provided in one embodiment of the present application.

[0029] Wherein, the accompanying drawings are marked as follows:

[0030] 100-lamp board; 101-first display area; 102-second display area; 111-first light-emitting element; 112-second light-emitting element; 200-reflector; 201-first part; 202-second part; 203-third part; 204-lamp hole; 205-reinforcement rib; 206-lamp cup; 300-adhesive double-sided tape layer; 301-first through-hole; 400-light-shielding double-sided tape layer; 401-second through-hole; 501-screw; 502-back panel; 503-thermal pad; 601-diffuser plate; 602-diffuser film; 603-brightness enhancement film; 604-brightness enhancement film; 605-middle iron frame; 606-iron frame fixing adhesive layer; 607-foam adhesive layer. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] Figure 1 This is a schematic diagram of the reflector and light panel after deformation provided by an embodiment of the present application. Figure 1 As shown, the reflector and light panel of the backlight unit are theoretically designed to fit snugly, but after actual assembly, they will deform to varying degrees. When the deformation of the reflector and light panel is inconsistent, a gap will exist between them, which is a major cause of crosstalk and light leakage. In particular, the deformation of the edge areas of the reflector and light panel is usually greater than that in the center, resulting in a larger gap at the edge. When lighting the display area in the center or the edge alone, the larger gap leads to more severe light leakage and crosstalk. However, the differences in materials and manufacturing processes between the reflector and light panel cannot guarantee the same deformation of the reflector and light panel.

[0033] Figure 2This is a partial schematic diagram of a light board provided in one embodiment of the present application. Figure 2 As shown in the figure, there are many circuits designed on the surface of the light board facing the reflector, and there are many circuit grooves on the circuits. In other words, the surface of the light board is not completely flat, and light can easily pass through the circuit grooves, causing light leakage and cross-light problems.

[0034] Based on this, the present application provides a backlight module and a display device including the backlight module. Figure 3 An exploded view of a backlight module provided in one embodiment of the present application is shown in FIG. Figure 3 As shown, the backlight module includes a lamp board 100, a reflector 200, an adhesive double-sided tape layer 300 and a light-shielding double-sided tape layer 400, wherein the reflector 200 is installed on the lamp board 100, and the adhesive double-sided tape layer 300 and the light-shielding double-sided tape layer 400 are both located between the lamp board 100 and the reflector 200 for adhering the light board 100 and the reflector 200.

[0035] Figure 4 This is a schematic diagram of the structure of the light board 100 provided in one embodiment of the present application. Figure 4 As shown, the light board 100 has light-emitting elements for emitting light, and the light-emitting elements may include at least one first light-emitting element 111 and at least one second light-emitting element 112. The first light-emitting element 111 and the second light-emitting element 112 are located in different areas of the light board 100. Specifically, the second light-emitting element 112 is located outside the first light-emitting element 111. For the convenience of description, it can be considered that the light board 100 has a first display area 101 and at least one second display area 102. The first display area 101 is located in the central area of the light board 100, and the second display area 102 is located outside the first display area 101. The first light-emitting elements 111 are all located in the first display area 101, and the second light-emitting elements 112 are all located in the corresponding second display area 102. Figure 4 There are four second display areas 102, two of which are symmetrically arranged on the left and right sides of the first display area 101 (refer to Figure 4 The other two second display areas 102 are symmetrically arranged on the lower side of the first display area 101 (refer to Figure 4 However, this is not limiting. The distribution of the first display area 101 and the second display area 102 is not limited to this, as long as the second display area 102 is located outside the first display area 101. The number of second display areas 102 is not limited to four, as long as it is greater than or equal to one.

[0036] In some embodiments, the first light-emitting element 111 and the second light-emitting element 112 can be lit independently, that is, all the first light-emitting elements 111 can be lit independently, or all the second light-emitting elements 112 can be lit independently. It can be seen that the first display area 101 and each second display area 102 can be lit independently, thereby realizing the partitioned display of the display device.

[0037] In some embodiments, the display device can be a display device that requires partitioned display, such as a miniLED liquid crystal display for an on-board instrument. In this case, the first display area 101 can be the main display area of the backlight module (such as the VA display area), which is used to display important vehicle information (such as vehicle speed, fuel level, mileage, etc.), and the first light-emitting element 111 is the light-emitting element in the main display area of the backlight module; the second display area 102 can be the atmosphere light display area and / or signal light display area of the backlight module, which is used to create a lighting atmosphere or indicate the vehicle condition, and the second light-emitting element 112 is the atmosphere light and / or signal light of the backlight module. Therefore, Figure 4 As can be seen from the figure, the area of the first display area 101 is larger than the area of each second display area 102 , but this is not limiting. The size of the area of the first display area 101 and each second display area 102 does not affect the implementation of the present application.

[0038] Please continue reading Figure 4 The light board 100 also includes a circuit board, and light-emitting elements are soldered on the circuit board as light sources. A control chip can also be set on the circuit board to control each light-emitting element to realize whether the first display area 101 and each second display area 102 are lit or not. Furthermore, there is at least one first light-emitting element 111 in the first display area 101, and at least one second light-emitting element 112 in each second display area 102. The first light-emitting element 111 and the second light-emitting element 112 can both be LED lamp beads. The LED lamp beads in the first display area 101 can generally be white light LED lamp beads, and the LED lamp beads in the second display area 102 can be white light LED lamp beads or other single-color or multi-color LED lamp beads.

[0039] In some embodiments, the number of first light-emitting elements 111 in the first display area 101 can be large, and multiple first light-emitting elements 111 can be arranged in an array in the first display area 101 to ensure the brightness and display effect of the first display area 101; the number of second light-emitting elements 112 in each second display area 102 can be small, and the distribution method of the second light-emitting elements 112 in the second display area 102 is not unique, and can be distributed in a straight line along the horizontal / vertical direction, or can have other distribution methods.

[0040] Figure 5 This is a schematic diagram of the surface of the reflector 200 facing the light board 100 provided in one embodiment of the present application. Figure 6Schematic diagram of the surface of the reflector 200 facing away from the light board 100 provided in one embodiment of the present application. Figure 5 and Figure 6 As shown, the reflector 200 is installed on the lamp board 100 , and has a plurality of lamp holes 204 on the reflector 200 . One lamp hole 204 corresponds to one light-emitting element, and the light-emitting element is located in the corresponding lamp hole 204 . In this way, the light-emitting element can be exposed from the reflector 200 . Figure 5 and Figure 6 In the figure, the shape of the lamp hole 204 corresponding to the first light-emitting element 111 is circular, the shape of the lamp hole 204 corresponding to the second light-emitting element 112 is square, and the size of the lamp hole 204 corresponding to the first light-emitting element 111 is larger than the size of the lamp hole 204 corresponding to the second light-emitting element 112, but this is not limited to it. The size and shape of the lamp hole 204 can be designed according to the size and shape of the corresponding light-emitting element.

[0041] Furthermore, the surface of the reflector 200 facing away from the light board 100 has a lamp cup 206, and each lamp cup 206 can be in the shape of a trumpet extending from bottom to top. Specifically, the lamp cup 206 can be formed by four identical and tilted cup surfaces integrally surrounding each other, with a square opening formed at the top of the lamp cup 206. Each lamp cup 206 surrounds a lamp hole 204, and the light generated by the light-emitting unit in each lamp hole 204 is collected by the lamp cup 206. At the same time, the collected light is reflected by the tilted and concave cup surface. Combined with the tilt angle of the opening of the lamp cup 206, the light can be evenly diffused, thereby reducing the problem of cross-lighting when the first light-emitting element 111 and the second light-emitting element 112 are displayed in partitions while achieving high brightness uniformity of the backlight module. Figure 6 In the embodiment, the shape and size of the lamp cup 206 corresponding to the first light-emitting element 111 are slightly different from those of the lamp cup 206 corresponding to the second light-emitting element 112, but this does not affect the implementation of the present application. The lamp cup 206 can also be designed according to the size and shape of its corresponding light-emitting element.

[0042] In some embodiments, the material of the reflective cover 200 can be plastic, such as ABS material or PC material, which can be injection molded. The side of the reflective cover 200 facing the light board 100 is a reflective surface, and its reflectivity to light is relatively high, for example, it can be 92% to 98%.

[0043] Please continue reading Figure 5 , a reinforcing rib 205 is provided on the surface of the reflector 200 facing the light board 100 ( Figure 5As shown by the red lines in the figure, the reinforcing ribs 205 are groove-shaped structures with openings at both ends. Since the structure of the reflector 200 is relatively complex and is easily deformed after injection molding, if the mold molding structure permits, as many reinforcing ribs 205 as possible can be provided on the surface of the reflector 200 facing the light board 100 to reduce the deformation of the reflector 200.

[0044] In some embodiments, the reflector 200 includes a first portion 201, a second portion 202, and a third portion 203. The first portion 201 corresponds to the first display area 101 (corresponding to the area where the first light-emitting element 111 is located), the second portion 202 corresponds to the second display area 102 (corresponding to the area where the second light-emitting element 112 is located), and the third portion 203 is located outside the first portion 201 and the second portion 202. In other words, the first portion 201 is mounted on the first display area 101, the second portion 202 is mounted on the second display area 102, and the third portion 203 is the portion of the reflector 200 excluding the first portion 201 and the second portion 202. Since the second display area 102 is located outside the first display area 101, the second portion 202 is also located outside the first portion 201. Generally speaking, the third portion 203 is also located outside the first portion 201. Furthermore, since the first display area 101 is the main display area of the backlight module, the arrangement of the first light-emitting elements 111 in the first display area 101 is usually relatively tight, so that the arrangement of the lamp holes 204 on the first part 201 is also relatively tight, so the first part 201 is not suitable for setting the reinforcing ribs 205; at the same time, the edge area of the reflective cover 200 is more easily deformed than the central area, and the second part 202 and the third part 203 are located at the edge of the reflective cover 200 and are more easily deformed, so all or at least part of the reinforcing ribs 205 can be set on the second part 202 and / or the third part 203, specifically on the surface of the second part 202 and / or the third part 203 facing the light board 100.

[0045] It should be noted that since a lamp hole 204 will be provided on the second part 202 and some other functional structures may also be provided on the third part 203, all or at least part of the reinforcing rib 205 can be provided in the idle area of the second part 202 and / or the third part 203.

[0046] In some embodiments, the reinforcing ribs 205 can be in at least one of a straight line shape, a cross shape, an L shape, or an X shape. The design and preparation of the reinforcing ribs 205 in these shapes are relatively simple. Of course, the reinforcing ribs 205 can also be in other regular or irregular shapes.

[0047] Please continue reading Figure 3, all or at least a portion of the adhesive double-sided adhesive layer 300 is located in the first display area 101, and the adhesive double-sided adhesive layer 300 is at least located between the first light-emitting element 111 and the light-shielding double-sided adhesive layer. For example, the adhesive double-sided adhesive layer 300 can be arranged around the first light-emitting element 111, so as to be mainly used to adhere the first display area 101 of the light board 100 and the first portion 201 of the reflector 200, thereby reducing the deformation between the first display area 101 of the light board 100 and the first portion 201 of the reflector 200; all or at least a portion of the light-shielding double-sided adhesive layer 400 is located in the second display area 1 02, the light-shielding double-sided adhesive layer 400 is located at least between the first light-emitting element 111 and the second light-emitting element 112 to separate the first light-emitting element 111 and the second light-emitting element 112 (that is, to isolate the first display area 101 from each second display area 102). On the one hand, the light-shielding double-sided adhesive layer 400 can also be used to adhere the light board 100 and the reflector 200 to reduce the deformation of the light board 100 and the reflector 200. On the other hand, the light-shielding double-sided adhesive layer 400 can also avoid the problems of light leakage and cross-light when the first light-emitting element 111 and the second light-emitting element 112 are lit separately.

[0048] Furthermore, the light-shielding double-sided adhesive layer 400 is in a compressed state, and the thickness of the light-shielding double-sided adhesive layer 400 when not compressed is greater than the thickness of the adhesive double-sided adhesive layer 300. Since the deformation of the edge areas of the light board 100 and the reflector 200 is usually greater than the deformation of the central area, and the second display area 102 is located outside the first display area 101, it is equivalent to using the adhesive double-sided adhesive layer 300 to pull the central area of the light board 100 and the reflector 200, and using the light-shielding double-sided adhesive layer 400 to pull the edge areas of the light board 100 and the reflector 200. The deformation of the lamp board 100 and the reflector 200 is made as consistent as possible to avoid the generation of gaps; and, since the light-shielding double-sided adhesive layer 400 is in a compressed state, even if the deformation of the lamp board 100 and the reflector 200 is inconsistent and a gap is generated, the light-shielding double-sided adhesive layer 400 can expand to fill the gap, thereby avoiding light leakage and cross-light problems caused by the gap. At the same time, the compressed light-shielding double-sided adhesive layer 400 can also be stuffed into the circuit groove on the circuit board of the lamp board 100 to fill the circuit groove, thereby avoiding light leakage and cross-light problems caused by the circuit groove.

[0049] In some embodiments, the adhesive double-sided adhesive layer 300 may also be in a compressed state. In this way, when the deformation of the first display area 101 of the light board 100 and the first part 201 of the reflector 200 is inconsistent and a gap is generated, the adhesive double-sided adhesive layer 300 may also expand to fill the gap. However, the thickness of the light-shielding double-sided adhesive layer 400 when not compressed still needs to be greater than the thickness of the adhesive double-sided adhesive layer 300 when not compressed.

[0050] It should be noted that the length and width of the backlight module in one embodiment of the present application are relatively large, so the left and right sides of the light board 100 and the reflector 200 (refer to Figure 4 and Figure 5 The direction) is the most easily deformed, the upper and lower sides of the light board 100 and the reflector 200 (refer to Figure 4 and Figure 5 Therefore, although the light-shielding double-sided adhesive layer 400 cannot be provided on the upper side of the lamp board 100 and the reflector 200 because the second light-emitting element 112 is not provided, on the one hand, there is no second light-emitting element 112 on the upper side of the lamp board 100, even if a gap is generated due to deformation, the impact of this gap is not large, and on the other hand, the light-shielding double-sided adhesive layer 400 is provided on the left and right sides of the lamp board 100 and the reflector 200, which can also limit the overall deformation of the lamp board 100 and the reflector 200.

[0051] Please continue reading Figure 3 In some embodiments, all or at least a portion of the adhesive double-sided adhesive layer 300 can completely cover the vacant area of the first display area 101 (i.e., the area of the first display area 101 excluding the first light-emitting elements 111), thereby enhancing the adhesion between the light board 100 and the reflector 200, while also preventing light crosstalk between two adjacent first light-emitting elements 111. Alternatively, it can be understood that the adhesive double-sided adhesive layer 300 has first through-holes 301, which correspond one-to-one with the first light-emitting elements 111. The first through-holes 301 also correspond one-to-one with the lamp holes 204 on the first portion 201 of the reflector 200. Each first light-emitting element 111 is located within a corresponding first through-hole 301. In this way, the first light-emitting element 111 can be exposed from the corresponding first through-hole 301 and the corresponding lamp hole 204.

[0052] Figure 7 This is a structural diagram of a light-shielding double-sided adhesive layer 400 provided in one embodiment of the present application. Figure 8 Schematic diagram of the relative positions of the light shielding double-sided adhesive layer 400 and the reflector 200 provided in one embodiment of the present application. Figure 7 and Figure 8As shown, in some embodiments, all or at least a portion of the light-shielding double-sided adhesive layer 400 can completely cover the vacant area of the second display area 102 (i.e., the area of the second display area 102 excluding the second light-emitting elements 112), thereby further enhancing the adhesion between the light board 100 and the reflector 200, while also preventing light crosstalk between two adjacent second light-emitting elements 112. Alternatively, it can be understood that the light-shielding double-sided adhesive layer 400 has second through-holes 401, which correspond one-to-one with the second light-emitting elements 112. The second through-holes 401 also correspond one-to-one with the lamp holes 204 on the second portion 202 of the reflector 200. Each second light-emitting element 112 is located within a corresponding second through-hole 401. In this way, the second light-emitting element 112 can be exposed from the corresponding second through-hole 401 and the corresponding lamp hole 204.

[0053] Of course, the light-shielding double-sided adhesive layer 400 does not necessarily have to completely cover the idle area of the second display area 102. For example, the light-shielding double-sided adhesive layer 400 is arranged on the periphery of the adhesive double-sided adhesive layer 300, or is arranged on the portion of the periphery of the adhesive double-sided adhesive layer 300 corresponding to the second display area 102. In this way, the light-shielding double-sided adhesive layer 400 can also play the effect of isolating the first display area 101 from each second display area 102.

[0054] Furthermore, the color of the adhesive double-sided adhesive layer 300 can be transparent to reduce light absorption and prevent the adhesive double-sided adhesive layer 300 from affecting the brightness of the first display area 101. Of course, the color of the adhesive double-sided adhesive layer 300 can also be white. In this way, although the adhesive double-sided adhesive layer 300 may absorb some light, it can prevent mutual interference between adjacent first light-emitting elements 111. The color of the light-shielding double-sided adhesive layer 400 is preferably black, so as to completely isolate the first display area 101 from each second display area 102, and isolate adjacent second light-emitting elements 112, avoiding light leakage and crosstalk.

[0055] In some embodiments, the materials of the adhesive double-sided adhesive layer 300 and the light-shielding double-sided adhesive layer 400 can both be VHB adhesive or foam adhesive, wherein the light-shielding double-sided adhesive layer 400 is preferably VHB adhesive. Compared with foam adhesive, VHB adhesive has a certain fluidity, so it can better fill the circuit groove on the circuit board of the light board 100 to avoid light leakage in the circuit groove.

[0056] In some embodiments, the thickness of the adhesive double-sided tape layer 300 may be 0.1 mm to 0.3 mm, and the thickness of the light-shielding double-sided tape layer 400 may be 0.5 mm to 0.7 mm.

[0057] The backlight module further includes screws 501, a backplate 502, a thermal pad 503, a diffuser plate 601, a diffuser film 602, a brightness enhancement film 603, a brightness enhancement film 604, a middle iron frame 605, an iron frame fixing adhesive layer 606, and a foam adhesive layer 607. The screws 501 are used to fasten the backplate 502 and the reflector 200 together, with the lamp board 100 sandwiched between the backplate 502 and the reflector 200. The thermal pad 503 is located between the backplate 502 and the lamp board 100 to dissipate heat from the lamp board 100. The middle iron frame 605 can be fixed to the reflector 200, fixing the diffuser plate 601, the diffuser film 602, the brightness enhancement film 603, and the brightness enhancement film 604, which are sequentially disposed between the reflector 200 and the middle iron frame 605. The diffuser plate 601 can be a rigid plate (such as PMMA) with a thickness of up to 1mm to 3mm. It achieves uniform light transmission through internal microstructures or the addition of diffusing agents. The diffuser film 602 is a flexible film (such as a PET substrate) with a thickness of usually between 0.1mm and 0.5mm. It relies on microstructures or chemical particles to achieve light diffusion, which can protect the brightness enhancement film 603 and improve the viewing angle and light softness. The brightness enhancement film 603 is also called BEF (Brightness Enhancement Film). It is an optical film with a uniform prism pattern precisely formed using acrylic resin on the surface of PET (polyethylene terephthalate) with very high transparency. Its main function is to focus the scattered light emitted by the light-emitting element in the front direction through the prism pattern, thereby increasing the brightness. The thickness of the brightness enhancement film 603 is very small, about 155μm. The brightness enhancement film 604 mainly increases the screen brightness and improves the visual effect by improving light utilization and reducing light loss. It is especially used in the backlight module to improve the overall brightness and contrast. In the backlight module, the middle iron frame 605 is primarily used to increase the structural strength and stability of the backlight module, preventing deformation or damage during transportation or use. The iron frame fixing adhesive layer 606 is primarily used to firmly bond the middle iron frame 605 to the reflector 200, ensuring the stability and durability of the entire backlight module. The foam adhesive layer 607 is used to prevent the backlight module from loosening or falling off during transportation or use. Furthermore, during the use of the backlight module, there may be some problems, such as vibration and noise. The foam adhesive layer 607 can absorb and mitigate these noise and vibration, thereby improving the performance and stability of the backlight module and protecting the backlight module from damage.

[0058] Figure 9 This is a schematic diagram of the backlight module during the preparation process provided in one embodiment of the present application. Figure 9As shown, during the assembly of the backlight module, after the back plate 502, the thermal pad 503, and the light board 100 are assembled, the adhesive double-sided adhesive layer 300 and the light-shielding double-sided adhesive layer 400 can be adhered to the corresponding positions of the reflector 200. Then, a pressing machine is used to press the reflector 200 onto the light board 100 and maintain the pressure (the pressure and the holding time can be adjusted based on the actual situation). The pressure of the pressing machine can be concentrated on the adhesive double-sided adhesive layer 300. Although the thickness of the light-shielding double-sided adhesive layer 400 is greater than the thickness of the adhesive double-sided adhesive layer 300 when it is not compressed, the thickness of the light-shielding double-sided adhesive layer 400 after compression can be greater than or equal to the thickness of the adhesive double-sided adhesive layer 300. Then, the screw 501 is tightened. The screw 501 can apply pressure to the light-shielding double-sided adhesive layer 400 through the reflector 200, so that after the backlight module is assembled, the light-shielding double-sided adhesive layer 400 can still be kept in a compressed state. Of course, the back plate 502 and the reflector 200 may be locked with the screws 501 first, and then the reflector 200 may be pressed onto the light board 100 with a pressing machine and the pressure is maintained, so that the light-shielding double-sided adhesive layer 400 is in a compressed state.

[0059] It should be noted that the pressing head of the pressing machine can be made of a softer material, such as silicone, so as to avoid fracturing the reflector 200.

[0060] In summary, an embodiment of the present application provides a backlight module and a display device, comprising a light board 100, a reflector 200, an adhesive double-sided adhesive layer 300 and a light-shielding double-sided adhesive layer 400, wherein the reflector 200 is mounted on the light board 100, the adhesive double-sided adhesive layer 300 and the light-shielding double-sided adhesive layer 400 are located between the light board 100 and the reflector 200 to adhere the light board 100 and the reflector 200, and the light board 100 comprises at least one first light-emitting element 111 and at least one second light-emitting element 112, wherein the second light-emitting element 112 is located at the first light-emitting element 111 and the second light-emitting element 112 is located at the second light-emitting element 112. On the outside of a light-emitting element 111, the first light-emitting element 111 and the second light-emitting element 112 can be independently illuminated. The adhesive double-sided adhesive layer 300 is located at least between the first light-emitting element 111 and the light-shielding double-sided adhesive layer 400. The light-shielding double-sided adhesive layer 400 is located at least between the first light-emitting element 111 and the second light-emitting element 112 and isolates the first light-emitting element 111 from the second light-emitting element 112. The light-shielding double-sided adhesive layer 400 is in a compressed state, and the thickness of the light-shielding double-sided adhesive layer 400 when uncompressed is greater than the thickness of the adhesive double-sided adhesive layer 300. The adhesive double-sided adhesive layer 300 is used to reduce deformation between the first display area 101 of the light board 100 and the first portion 201 of the reflector 200. The light-shielding double-sided adhesive layer 400 is used to reduce deformation of the light board 100 and the reflector 200 on the one hand, and on the other hand, it can avoid light leakage and cross-light problems when the first light-emitting element 111 and the second light-emitting element 112 are illuminated separately. Furthermore, the thickness of the light-shielding double-sided adhesive layer 400 when not compressed is greater than the thickness of the adhesive double-sided adhesive layer 300. Since the deformation of the edge areas of the light board 100 and the reflector 200 is usually greater than the deformation of the central area, and the second light-emitting element 112 is located outside the first light-emitting element 111, it is equivalent to using the adhesive double-sided adhesive layer 300 to pull the central area of the light board 100 and the reflector 200, and using the light-shielding double-sided adhesive layer 400 to pull the edge areas of the light board 100 and the reflector 200, so that the light board 100 and the reflector 200 are deformed. 0 and the reflector 200 are as consistent as possible to avoid the generation of gaps; and, since the light-shielding double-sided adhesive layer 400 is in a compressed state, even if the deformation amounts of the lamp board 100 and the reflector 200 are inconsistent and a gap is generated, the light-shielding double-sided adhesive layer 400 can expand to fill the gap, thereby avoiding light leakage and cross-light problems caused by the gap. At the same time, the compressed light-shielding double-sided adhesive layer 400 can also be stuffed into the circuit groove on the circuit board of the lamp board 100 to fill the circuit groove, thereby avoiding light leakage and cross-light problems caused by the circuit groove.

[0061] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. The systems disclosed in the embodiments are described briefly because they correspond to the methods disclosed in the embodiments. For relevant details, refer to the method description.

[0062] It should also be noted that although the present application has been disclosed above with preferred embodiments, the above embodiments are not intended to limit the present application. For any person skilled in the art, without departing from the scope of the technical solution of the present application, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present application, or to modify it into an equivalent embodiment with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the scope of protection of the technical solution of the present application.

[0063] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish the various components, elements, steps, etc. in the specification, and are not used to indicate the logical relationship or sequential relationship between the various components, elements, steps, etc.

[0064] It should also be recognized that the terms described herein are used only to describe specific embodiments and are not intended to limit the scope of the present application. It should be noted that the singular forms "a" and "an" used herein include plural references unless the context clearly indicates otherwise. For example, a reference to "a step" or "a device" means a reference to one or more steps or devices and may include secondary steps and secondary devices. All conjunctions used should be understood in the broadest sense. Also, the word "or" should be understood to have the definition of a logical "or" rather than a logical "exclusive or" unless the context clearly indicates otherwise. In addition, the implementation of the methods and / or devices in the embodiments of the present application may include performing the selected tasks manually, automatically, or in combination.

Claims

1. A backlight module, characterized in that: include: A light panel (100) comprises at least one first light-emitting element (111) and at least one second light-emitting element (112), wherein the second light-emitting element (112) is located outside the first light-emitting element (111), and the first light-emitting element (111) and the second light-emitting element (112) can be lit independently; a reflector (200), mounted on the light panel (100); and The adhesive double-sided adhesive layer (300) and the light-shielding double-sided adhesive layer (400) are both located between the light board (100) and the reflector (200) to adhere the light board (100) and the reflector (200); the adhesive double-sided adhesive layer (300) is at least located between the first light-emitting element (111) and the light-shielding double-sided adhesive layer (400); the light-shielding double-sided adhesive layer (400) is at least located between the first light-emitting element (111) and the second light-emitting element (112) to isolate the first light-emitting element (111) from the second light-emitting element (112); and the thickness of the light-shielding double-sided adhesive layer (400) when not compressed is greater than the thickness of the adhesive double-sided adhesive layer (300).

2. The backlight module according to claim 1, wherein: The light-shielding double-sided adhesive layer (400) is in a compressed state, and the adhesive double-sided adhesive layer (300) is in a compressed state.

3. The backlight module according to claim 1, wherein: The adhesive double-sided adhesive layer (300) has at least one first through hole, and the first light-emitting element (111) is located in the corresponding first through hole. The light-shielding double-sided adhesive layer (400) has at least one second through hole, and the second light-emitting element (112) is located in the corresponding second through hole.

4. The backlight module according to claim 1 or 3, wherein: The color of the adhesive double-sided adhesive layer (300) is transparent or white, and the color of the light-shielding double-sided adhesive layer (400) is black.

5. The backlight module according to claim 1 or 3, wherein: The material of the adhesive double-sided adhesive layer (300) is VHB adhesive or foam adhesive, and the material of the light-shielding double-sided adhesive layer (400) is VHB adhesive or foam adhesive.

6. The backlight module according to claim 1, wherein: A reinforcing rib (205) is provided on the surface of the reflector (200) facing the light board (100).

7. The backlight module according to claim 6, wherein: The reflector (200) comprises a first portion (201), a second portion (202) and a third portion (203), wherein the first portion (201) corresponds to an area where the first light-emitting element (111) is located, the second portion (202) corresponds to an area where the second light-emitting element (112) is located, and the third portion (203) is located outside the first portion (201) and the second portion (202). All or at least a portion of the reinforcing rib (205) is arranged on the second portion (202) and / or the third portion (203).

8. The backlight module according to claim 6 or 7, characterized in that: The reinforcing rib (205) is in at least one of a straight shape, a cross shape, an L shape or an X shape.

9. The backlight module according to claim 1, wherein: The first light-emitting element (111) is a light-emitting element in the main display area of the backlight module, and the second light-emitting element (112) is an ambient light and / or a signal light of the backlight module.

10. A display device, characterized in that: The invention comprises the backlight module according to any one of claims 1 to 9.

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