Display apparatus

Abstract

A display apparatus, comprising: a back plate (6); a middle frame (2), provided along the edge of the back plate (6), the middle frame (2) comprising a first bearing portion (21), and the first bearing portion (21) being attached and fixed to the front side of the back plate (6); a display panel (1), a mounting space being formed between the display panel (1) and the back plate (6); and a backlight module, which comprises a light board (4) and a diffuser plate (3), the diffuser plate (3) being provided on the front side of the light board (4). A mounting gap is formed between the diffuser plate (3) and a side surface (211) of the first bearing portion, and a fixing adhesive block (8) is provided in the mounting gap, one side of the fixing adhesive block (8) being bonded to the diffuser plate (3), and the other side thereof being bonded to the side surface (211) of the first bearing portion. The diffuser plate (3) and the side surface of the middle frame (2) are fixedly connected by means of the fixing adhesive block (8), thereby avoiding the increase in the weight of the display panel (1), and further reducing the possibility of the display panel (1) falling off.

Description

Display device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese applications filed on January 2, 2024, with application number 202410003178.5; filed on March 4, 2024, with application number 202410244975.2; and filed on March 11, 2024, with application number 202420458152.5, the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the field of display technology, and in particular to a display device. Background Art

[0004] The thinning of display devices is a future development trend. The thinning of display devices leaves no corresponding supporting space for the diffuser plate. Therefore, the diffuser plate, the display device and the diaphragm are generally fixed together by fully laminating the diffuser plate, the diaphragm and the display panel, and then the diffuser plate, the display device and the diaphragm are affixed to the back panel assembly through a panel tape frame. Since each layer between the diffuser plate, the diaphragm and the display panel needs to be laminated and fixed, the panel lamination requirements are high and the large number of laminating layers easily produces problems such as orange peel texture. In addition, since the weight of the diffuser plate acts on the display panel, the weight of the display panel increases dramatically after lamination, affecting the safety of the tape and causing the display panel to fall off. Summary of the Invention

[0005] The present disclosure provides a display device, which may include: a back panel; a middle frame, which may be arranged along the edge of the back panel, and the middle frame includes a first supporting portion, and the first supporting portion may be fitted and fixed to the front side of the back panel; a display panel, the edge of the display panel may be fitted and fixed to a side of the first supporting portion away from the back panel, and an installation space may be formed between the display panel and the back panel; a backlight module, which may be arranged in the installation space; the backlight module may include a light board and a diffuser plate, and the diffuser plate may be arranged on the front side of the light board; wherein, an installation gap is provided between the diffuser plate and the side surface of the first supporting portion, and a fixing rubber block may be provided in the installation gap, and one side of the fixing rubber block may be bonded to the diffuser plate, and the other side may be bonded to the side surface of the first supporting portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] FIG1 is a schematic structural diagram of a display device according to some embodiments;

[0007] FIG2 is a cross-sectional view of a display device along the line AA according to some embodiments;

[0008] FIG3 is a schematic diagram showing the dimensions of a fixed adhesive block according to some embodiments;

[0009] FIG4 is a schematic structural diagram of a fixed rubber block according to some embodiments;

[0010] FIG5 is a schematic diagram of a middle frame structure according to some embodiments;

[0011] FIG6 is a schematic structural diagram of a display device without displaying a fixed glue block according to some embodiments;

[0012] FIG7 is a cross-sectional view of a display device along the line AA according to some embodiments;

[0013] FIG8 is a schematic structural diagram of a fixed rubber block according to some embodiments;

[0014] FIG9 is a schematic structural diagram of a middle frame according to some embodiments;

[0015] FIG10 is a schematic structural diagram of a display device without a fixed glue block according to some embodiments;

[0016] FIG11 is a schematic structural diagram of a backlight module according to some embodiments;

[0017] FIG12 is a partial enlarged view of point A shown in FIG1 ;

[0018] FIG13 is a schematic diagram showing the dimensions of reflective grooves and seams according to some embodiments;

[0019] FIG14 is a schematic structural diagram of a reflective groove according to some embodiments;

[0020] FIG15 is another schematic structural diagram of a reflective groove according to some embodiments;

[0021] FIG16 is a schematic diagram of light reflection from the reflective groove structure shown in FIG15 ;

[0022] FIG17 is another schematic structural diagram of a reflective groove according to some embodiments;

[0023] FIG18 is another schematic structural diagram of a reflective groove according to some embodiments;

[0024] FIG19 is another schematic structural diagram of a reflective groove according to some embodiments;

[0025] FIG20 is a schematic diagram of light reflection from the reflective groove structure shown in FIG19 ;

[0026] FIG21 is another structural schematic diagram of a backlight module according to some embodiments;

[0027] FIG22 is a schematic diagram of a module structure in a related solution;

[0028] FIG23 is another schematic diagram of the module structure in the related solution;

[0029] FIG24 is a schematic diagram of a dam support structure according to some embodiments;

[0030] FIG25 is another structural diagram of a backlight module according to some embodiments;

[0031] FIG26 is a schematic diagram of an optical path according to some embodiments;

[0032] FIG27 is another structural schematic diagram of a backlight module according to some embodiments;

[0033] FIG28 is another structural schematic diagram of a backlight module according to some embodiments;

[0034] FIG29 is another structural schematic diagram of a backlight module according to some embodiments;

[0035] FIG30 is another structural schematic diagram of a backlight module according to some embodiments;

[0036] FIG31 is another structural schematic diagram of a backlight module according to some embodiments;

[0037] FIG32 is another structural schematic diagram of a backlight module according to some embodiments;

[0038] FIG33 is another structural diagram of a backlight module according to some embodiments;

[0039] FIG34 is another structural schematic diagram of a backlight module according to some embodiments;

[0040] FIG35 is a schematic structural diagram of a diffusion plate according to some embodiments;

[0041] FIG36 is another structural schematic diagram of a diffusion plate according to some embodiments;

[0042] FIG37 is another schematic structural diagram of a diffusion plate according to some embodiments;

[0043] FIG38 is a schematic diagram of a circuit substrate structure according to some embodiments;

[0044] FIG39 is another schematic structural diagram of a circuit substrate according to some embodiments;

[0045] FIG40 is another schematic structural diagram of a circuit substrate according to some embodiments;

[0046] FIG41 is another schematic structural diagram of a circuit substrate according to some embodiments;

[0047] FIG42 is another schematic structural diagram of a circuit substrate according to some embodiments;

[0048] FIG43 is another structural schematic diagram of a backlight module according to some embodiments.

[0049] Among them, 1. Display panel; 2. Middle frame; 3. Diffuser plate; 4. Light board; 5. Lamp beads; 6. Back panel; 7. Fixing tape; 8. Fixing rubber block; 11. PCB board; 12. LED assembly; 13. Support member; 21. First bearing part; 22. Support platform; 41. LED light board; 42. Reflector; 44. Quantum film; 45. Laminating film; 81. First rubber block; 82. Second rubber block; 100. Light source; 101. Seam; 121. LED chip; 12 2. Protective glue points; 201. First accommodating cavity; 202. Second accommodating cavity; 203. Third accommodating cavity; 211. Side of the first bearing part; 221. First supporting surface; 300. Circuit substrate; 500. Light-emitting unit; 600. Reflection unit; 601. First reflecting part; 602. Second reflecting part; 700. Driver chip; 801. Cross-line resistor; 802. Cross-line capacitor; 301. Reflective groove; 821. Second supporting surface; 900. Fixed protective structure. DETAILED DESCRIPTION

[0050] In thinner display devices, due to the dense concentration of lamp beads on the lamp board, there is no corresponding support space for the diffuser plate in the display device. The current main method is to fix the diffuser plate, diaphragm, and display panel layer by layer with optical adhesive. Due to the angle of the bonding layers, it is easy to produce undesirable phenomena such as orange peel texture, which affects the normal use of the display device. In addition, fixing the diffuser plate to the display panel effectively applies the weight of the diffuser plate to the display panel. The edge of the display panel is fixed to the middle frame with panel tape. The adhesion of the diffuser plate to the display panel increases the weight of the display panel, affecting the safe use of the panel tape and easily causing the display panel to fall off.

[0051] In view of this, an embodiment of the present disclosure provides a display device, which fixes the diffuser plate and the middle frame by setting a fixed rubber block in the installation gap between the diffuser plate and the side of the middle frame, thereby reducing the number of bonding layers and avoiding the generation of orange peel texture. At the same time, the weight of the diffuser plate no longer acts on the display panel, reducing the risk of the display panel falling off.

[0052] Specifically, as shown in FIG. 1 to FIG. 10 , the display device provided by the embodiment of the present disclosure may include:

[0053] Back plate 6, used to support the entire display device;

[0054] The middle frame 2 is arranged along the edge of the back plate 6. The middle frame 2 is arranged along the edge of the back plate 6 and includes a first bearing portion 21. The first bearing portion 21 is fixed to the front side of the back plate 6; the first bearing portion 21 is used to support the display panel 1 and the backlight module;

[0055] The display panel 1 is fixed to the edge of the display panel 1 and the side of the first supporting portion 21 away from the back plate 6, and a mounting space is formed between the display panel 1 and the back plate 6;

[0056] A backlight module is provided in the installation space, and the backlight module includes a lamp board 4 and a diffusion plate 3, the diffusion plate 3 is provided in front of the lamp board 4, and the lamp board 4 is provided with lamp beads 5;

[0057] There is an installation gap between the diffuser plate 3 and the side surface 211 of the first supporting part. A fixing rubber block 8 is set in the installation gap. One side of the fixing rubber block 8 is bonded to the diffuser plate 3, and the other side is bonded to the side surface 211 of the first supporting part.

[0058] The diffuser plate 3 is fixed to the side of the middle frame 2 via adhesive blocks 8, which prevents the display panel 1 from being overweight and reduces the possibility of the display panel 1 falling off. Furthermore, the diffuser plate 3 is no longer attached to the display panel 1, avoiding undesirable effects such as orange peel texture caused by excessive lamination layers.

[0059] The installation gap is set to facilitate the installation of the diffuser plate 3 and the light board 4. The installation gap is used to set the fixing rubber block 8 to fix the diffuser plate 3. On the basis of changing the overall structure of the display device, space is provided for fixing the diffuser plate 3.

[0060] The display panel 1 is located on the light-emitting side of the backlight module. The shape and size of the display panel 1 usually match the backlight module. Normally, the display panel 1 can be set to a rectangle, including a top side, a bottom side, a left side and a right side, wherein the top side and the bottom side are opposite to each other, the left side and the right side are opposite to each other, the top side is respectively connected to one end of the left side and one side of the right side, and the bottom side is respectively connected to the other end of the left side and the other end of the right side.

[0061] Display panel 1 is a transmissive display panel 1 that can modulate light transmittance but does not emit light itself. Display panel 1 has multiple pixel units arranged in an array. Each pixel unit can independently control the transmittance and color of light incident on it from the backlight module, so that the light transmitted by all pixel units constitutes the displayed image.

[0062] The backlight module is usually located at the bottom of the display device, and its shape and size are adapted to the shape and size of the display device. When used in fields such as televisions or mobile terminals, the backlight module usually adopts a rectangular shape.

[0063] The backlight module in the embodiment of the present disclosure adopts a direct-type backlight module, which is used to emit light evenly across the entire light-emitting surface, providing the display panel 1 with light of sufficient brightness and even distribution, so that the display panel 1 can display images normally.

[0064] Furthermore, as shown in conjunction with Figures 3 and 6 , the side surface 211 of the first supporting portion is flat, and the first supporting portion 21 only supports the display panel 1. A fixing tape 7 is provided on the side of the first supporting portion 21 away from the back panel 6, for fixing the display panel 1 to the first supporting portion 21. A mounting gap exists between the side surface 211 of the first supporting portion and the light panel 4 and diffuser panel 3. The fixing rubber block 8 includes a first rubber block 81 formed on the side surface of the diffuser panel 3 and a second rubber block 82 formed between the diffuser panel 3 and the back panel 6. The first rubber block 81 and the second rubber block 82 are arranged in an L-shape.

[0065] Continuing with Figures 3 and 4, the size of the lamp board 4 is smaller than that of the diffuser plate, so the width of the installation gap formed between the lamp board 4 and the side surface 211 of the first bearing part is greater than the size of the installation gap formed between the diffuser plate 3 and the side surface 211 of the first bearing part. The fixed rubber block 8 is formed by dispensing glue, and the glue is dispensed at the installation gap between the diffuser plate 3 and the side surface 211 of the first bearing part. The glue flows between the lamp board 4 and the first bearing part 21, that is, flows to the bottom of the diffuser plate 3 to form a second rubber block 82 to support the diffuser plate 3.

[0066] In some embodiments, the second supporting surface 821 of the second rubber block 81 is arranged to fit the diffuser plate 3, and the width of the second rubber block 82 is 1 mm, that is, the width L of the second supporting surface is 1 mm. A 1 mm wide second rubber block 82 is formed below the diffuser plate to support the diffuser plate 3.

[0067] Furthermore, in combination with FIG9 , in some embodiments of the present disclosure, the side surface 211 of the first supporting portion protrudes toward the direction close to the lamp board 4 to form a support platform 22 , and the first supporting surface 221 of the support platform 22 is in contact with the rear side surface of the diffuser plate 3 for supporting the diffuser plate 3 .

[0068] In some embodiments, a certain gap may be retained between the support platform 22 and the light board 4 to facilitate the installation of the light board 4, and the rear side of the support platform 22 is in contact with the back panel 6, and the front side of the support platform 22 is in contact with the diffuser plate 3. After the diffuser plate 3 is installed, the diffuser plate 3 is supported.

[0069] When the support platform 22 supports the diffuser plate 3 and the adhesive is applied to form the fixed adhesive block 8, the fixed adhesive block 8 is formed only between the diffuser plate 3 and the side surface 211 of the first supporting portion. In other words, the cross-sectional shape of the formed fixed adhesive block 8 is rectangular. As shown in FIG2 , the lower side of the fixed adhesive block 8 is in contact with the upper side of the support platform 22, the left side of the fixed adhesive block 8 is in contact with the side surface 211 of the first supporting portion, and the right side of the fixed adhesive block 8 is in contact with the left side of the diffuser plate 3.

[0070] In some embodiments, a side of the support platform 22 away from the diffuser plate is flush with the rear side surface of the first supporting portion 21 and is attached and fixed to the back plate 6 .

[0071] In some embodiments, the fixing glue block 8 may be ultraviolet curing glue.

[0072] Ultraviolet curing adhesive is also called shadowless adhesive or UV curing adhesive. Shadowless adhesive is a type of adhesive that must be irradiated with ultraviolet light to cure. It can be used as an adhesive, but can also be used as a glue for paints, coatings, inks, etc. UV is the abbreviation of Ultraviolet Rays, which means ultraviolet light. Ultraviolet (UV) light is invisible to the naked eye and is a section of electromagnetic radiation beyond visible light, with a wavelength ranging from 10 to 400 nm. The curing principle of shadowless adhesive is that the photoinitiator (or photosensitizer) in the UV curing material absorbs ultraviolet light under ultraviolet light and produces active free radicals or cations, which trigger monomer polymerization and cross-linking chemical reactions, causing the adhesive to transform from liquid to solid within seconds.

[0073] Since the size of the installation gap is generally small, the fixed rubber block 8 is difficult to attach to the installation gap in the form of tape. The UV curing glue is in liquid form and can be dripped into the installation gap by dispensing. Then, it is transformed into a solid state by irradiation with an ultraviolet lamp to form a fixed rubber block 8. No matter how small the installation gap is, it can be operated.

[0074] The fixing rubber block 8 may also be made of other forms of curing glue. By utilizing the fluidity of the curing glue, the fixing rubber block 8 is filled into the installation gap to fix the diffuser plate 3 .

[0075] In some embodiments, the cured adhesive block is a transparent adhesive block. After the UV-curable adhesive is cured by ultraviolet radiation, the transparent or translucent adhesive block formed does not affect the normal passage of light, that is, it is light-transmissive.

[0076] In some embodiments, the fixing rubber block 8 is provided on at least one side of the diffuser plate 3. The fixing rubber block 8 is provided on at least one of the top side, bottom side, left side, or right side of the diffuser plate. The fixing rubber block 8 is provided on one side of the diffuser plate 3 to securely connect the diffuser plate 3 to the middle frame 2, so that the weight of the diffuser plate 3 acts on the middle frame 2.

[0077] In some embodiments, the fixing rubber blocks 8 are preferably arranged on the top side and the bottom side of the diffuser plate 3 to provide a certain support to the diffuser plate 3 .

[0078] In a preferred embodiment, the fixing rubber blocks 8 are arranged around the diffuser plate 3 , that is, the fixing rubber blocks 8 are arranged on the sky side, the ground side, the left side and the right side of the diffuser plate.

[0079] The fixed rubber blocks 8 may be continuously arranged around the diffuser plate 3 , or may be provided in plurality, with the plurality of fixed rubber blocks 8 being arranged at intervals around the diffuser plate 3 .

[0080] In fact, the setting method of the fixed rubber block 8 is related to the setting method of the middle frame 2. When the middle frame 2 is continuously set around the diffuser plate 3, the fixed rubber block 8 can be continuously set or set at intervals; when the middle frame 2 is set at intervals around the diffuser plate 3, the fixed rubber block 8 can only be set at intervals around the diffuser plate 3.

[0081] It should be noted that the display panel 1 of the embodiment of the present disclosure is formed by bonding and fixing a multi-layer panel and a film, and the diffuser plate 3 includes a diffuser plate and a multi-layer film provided on the front side of the diffuser plate. The display panel 1 and the diffuser plate 3 are independent of each other, and the panel and the film, the film and the film of the display panel 1, and the diffuser plate and the film, the film and the film of the diffuser plate 3 are all connected by optical glue, wherein the optical glue is preferably OCA (Optically Clear Adhesive), a special adhesive used for bonding transparent optical elements (such as lenses, etc.). It is required to be colorless and transparent, with a light transmittance of more than 95%, good bonding strength, can be cured at room temperature or medium temperature, and has small curing shrinkage.

[0082] Therefore, the use of OCA optical adhesive can reduce glare and light loss, provide higher light transmittance, and thus increase the brightness of the display panel 1. It can also increase contrast, especially under strong light. Furthermore, the surface connection achieved through OCA optical adhesive can achieve higher strength, ensuring the structural strength of the display panel 1 and the optical film, and the diffuser plate and film after bonding.

[0083] The diffusion plate is formed by mixing and extruding PC (polycarbonate), PMMA (polymethyl methacrylate), PET (polyethylene terephthalate), and PVC (polyvinyl chloride) with light diffusing agents and additives respectively; the diffusion plate adopts an integrated molding structure, which has higher strength and is not easy to deform or break.

[0084] In some embodiments, a fixing rubber block 8 can be used to fix and support the diffuser plate 3, avoiding the need for layer-by-layer bonding and fixing of the diffuser plate 3 and the display panel 1. Generally speaking, the back plate 6 needs to have good strength and heat dissipation capabilities, and therefore, is mostly made of metal.

[0085] The display device provided by the disclosed embodiments utilizes the aforementioned process to apply UV-curable adhesive within the mounting gap between the diffuser plate and the side surface of the first supporting portion of the middle frame, thereby securing the diffuser plate to the middle frame. This prevents the display panel from being weighed down and, consequently, reduces the likelihood of the display panel falling off. Furthermore, the diffuser plate is no longer bonded to the display panel, thus avoiding undesirable effects such as orange peel texture caused by excessive bonding layers.

[0086] Considering that most of the light boards in current display devices are LED light boards, and are limited by existing punching machines, mini-LED products are all punched into small light boards, which are then spliced ​​into large-size backlights. The size of a single light board is small, so when mini-LED light boards are used in the backlight design of large-size display devices, there is the problem of having to splice multiple mini-LED light boards.

[0087] Multiple mini-LED light panels form a seam at the joints of the PCB, and the reflective sheet on the PCB overlaps at the seam, resulting in an uneven reflective sheet at the seam. This can easily form a shadow at the seam, especially when the light mixing distance is small. In view of this, the backlight module of the embodiment of the present disclosure can also be made of LED material (such as mini LED), that is, the light panel 4 in the backlight module is an LED light panel. The backlight module can be shown in Figures 11 to 20. The backlight module of the embodiment of the present disclosure includes:

[0088] There are multiple LED light boards 41 , and the multiple LED light boards 41 are arranged in an array, with seams 101 formed between adjacent LED light boards 41 ;

[0089] Reflective sheets 42 are disposed one by one on the front side of the LED light board 41 , and adjacent reflective sheets 42 are overlapped at the seams 101 ;

[0090] The diffuser plate 3 does not need to be spliced ​​and is a whole piece. It is arranged on the front side of the reflector 42, and there is a light mixing gap between the diffuser plate 3 and the reflector 42. Among them, the rear side surface of the diffuser plate 3 is recessed at the position corresponding to the splicing seam 101 to form a reflective groove 31, and the side wall of the reflective groove 31 is inclined toward the side away from the reflector 42, and a reflective layer is provided on the side wall of the reflective groove 31.

[0091] Therefore, by forming a reflective groove 31 at a position corresponding to the seam on the rear side surface of the diffuser plate 3, the side wall of the reflective groove 31 is inclined toward the side away from the reflective sheet 42, and a reflective layer is provided on the side wall of the reflective groove 31. When light is irradiated onto the side wall of the reflective groove 31, it is reflected by the reflective layers on the two side walls of the reflective groove 31 and emitted toward the front side of the reflective groove 31, so that the light at the seam is more concentrated, the light intensity at the seam is increased, and the shadow problem at the seam is solved.

[0092] In some embodiments, the diffuser plate 3 is covered with a quantum film 44 and a lamination film 45 .

[0093] In the assembly structure of the display device, multiple LED light boards 41 are arranged in an array on the front side of the back panel. The LED light board 41 may include a PCB board 11 and an LED component 12 provided on the front side of the PDB board. The LED component includes an LED chip 121 and a protective glue point 122 wrapped around the LED chip 121. Each PCB board 11 is provided with multiple LED chips 121, and the multiple LED chips 121 are evenly distributed on the PCB board 11. After the LED chip 121 is welded to the pad on the PCB board 11, it is necessary to form a hemispherical protective glue point 122 on the LED chip 121 through dispensing technology to expand the light output angle of the LED chip 121.

[0094] In some embodiments, the number of reflective sheets 42 can be equal to the number of LED light boards 41, and the reflective sheets 42 are arranged one-to-one on the front side of the LED light boards 41. The reflective sheets 42 are provided with openings for exposing the protective glue dots 122. The size of the reflective sheets 42 is larger than the size of the corresponding LED light boards 41. A seam 101 of a set width is formed between adjacent LED light boards 41. Adjacent reflective sheets 42 overlap at positions corresponding to the seams 101, completely covering the seams 101.

[0095] In some embodiments, the diffuser plate 3 can be positioned in front of the reflective sheet 42, with a light mixing gap between the diffuser plate 3 and the reflective sheet 42. The size of the light mixing gap is also called the light mixing distance. A larger light mixing distance results in more complete light mixing of the LED light beams, less light dropouts, and better visual effects. However, a larger light mixing distance may also increase the thickness of the display device. For thin and light display devices, the light mixing distance is generally relatively small. In particular, when the light mixing distance is less than 3.5 mm, uneven light mixing and uneven overlap of the reflective sheet 42 at the seam 101 can cause dark shadows at the seam 101. The backlight module provided by the embodiment of the present disclosure is provided with a reflective groove 31 at a position corresponding to the joint 101 on the rear side surface of the diffuser plate 3. Since the side wall of the reflective groove 31 is inclined toward one side of the reflective sheet 42 and a reflective layer is provided on the side wall of the reflective groove 31, it can reflect the incident light, and the outgoing light after reflection by the reflective layer is directed forward. After reflection, the light at the joint 101 is more concentrated, thereby increasing the light intensity at the joint 101 and solving the problem of shadows at the joint 101.

[0096] At the same time, since the reflective grooves 31 are provided on the diffuser plate 3 , the thickness of the diffuser plate 3 is relatively thin at the position corresponding to the reflective grooves 31 , which can improve the transmittance of light at that position and also achieve the effect of brightening the joint 101 .

[0097] In some embodiments, the orientation of the reflective grooves 31 on the diffuser plate 3 may be consistent with the orientation of the corresponding seams 101. Because the LED light panels 41 are arranged in an array, the seams 101 formed between the upper and lower LED light panels 41 are horizontal, and the seams 101 formed between the left and right LED light panels 41 are vertical. The orientation of the reflective grooves 31 formed on the diffuser plate 3 is consistent with the orientation of the corresponding seams 101. In other words, the reflective grooves 31 on the diffuser plate 3 corresponding to the horizontal seams 101 are oriented in the horizontal direction of the display device, and the reflective grooves 31 on the diffuser plate 3 corresponding to the vertical seams 101 are oriented in the longitudinal direction of the display device.

[0098] The length of the reflective groove 31 is greater than or equal to the length of the corresponding seam 101 , so that the shadow phenomenon at the entire seam 101 can be improved.

[0099] In some embodiments, the width from the reflective groove 31 to the groove mouth to the groove bottom can be gradually increased, and the side walls on both sides of the reflective groove 31 are inclined toward the side away from the reflective sheet 42 to ensure that the light irradiated on the side walls on both sides of the reflective groove 31 is reflected by the reflective layer and then intersects in front of the reflective groove 31, so that the light at the seam 101 is more concentrated, thereby increasing the light intensity at the seam 101 and solving the problem of dark shadows at the seam 101.

[0100] In some embodiments, the sidewalls of the reflective grooves 31 can be tilted forward relative to the rear side of the diffuser plate 3 at any position. Therefore, when light incident from the rear hits the reflective layer, it is reflected by the reflective layer in a direction on the other side of the normal. In other words, the reflected light is emitted forward, causing the reflected light from the sidewalls of the two reflective grooves 31 to intersect in the front, increasing the light intensity at the seam 101 and solving the problem of dark shadows at the seam 101.

[0101] In some embodiments, the width of the notch of the reflective groove 31 may be greater than or equal to the width of the seam 101, and the projection of the seam 101 on the rear side of the diffuser plate 3 falls within the notch of the reflective groove 31, so as to ensure that the shadows produced by the seam 101 along the width direction can be reduced.

[0102] In some embodiments, the width of the seam 101 may be equal to the width of the notch of the reflective groove 31, so that the projection of the seam 101 on the rear side surface of the diffuser plate 3 coincides with the notch of the reflective groove 31; in some embodiments, the width of the seam 101 is smaller than the width of the notch of the reflective groove 31, so that the projection of the seam 101 on the rear side surface of the diffuser plate 3 falls into the notch of the reflective groove 31, and one side may coincide with the notch of the reflective groove 31, and the other side may be located in the notch of the reflective groove 31.

[0103] In some embodiments, assuming that the width of the seam 101 is P, the width of the notch of the reflective groove 31 is L2, and the width of the bottom of the reflective groove 31 is L1, L2 = P + δ1, δ1 is a constant, L1 = L2 + δ2, and δ2 is also a constant. The value of P is related to the arrangement of the LED light board 41. In general display device products, the value of P is between 2mm and 3mm. The values ​​of δ1 and δ2 are related to the size of the light mixing gap and the depth of the reflective groove 31. In some embodiments, the values ​​of δ1 and δ2 can both be 2mm, that is, L2 = P + 2mm, L1 = L2 + 2mm.

[0104] The two side walls of the reflective groove 31 can be symmetrical or asymmetrical. When the two side walls of the reflective groove 31 are symmetrical, the inclination degrees of the two side walls of the reflective groove 31 are the same. When the two side walls of the reflective groove 31 are asymmetrical, the inclination degrees of the two side walls of the reflective groove 31 are different.

[0105] In some embodiments, the two side walls of the reflective groove 31 can be symmetrically arranged, the groove bottom of the reflective groove 31 is a plane parallel to the rear side surface of the diffuser plate 3, and the two side walls of the reflective groove 31 are symmetrically arranged about the mid-vertical plane of the groove bottom of the reflective groove 31.

[0106] In some embodiments, the center plane of the reflective groove 31 may be located in the same plane as the center plane of the seam 101, that is, the reflective groove 31 is directly opposite to the seam 101, and the projection of the seam 101 on the rear side surface of the diffuser plate 3 is two parallel line segments, and the distance between these two parallel line segments and the two contour lines of the groove opening of the reflective groove 31 is equal.

[0107] In some embodiments, as shown in Figure 12, the side wall of the reflective groove 31 is a plane, that is, the side wall of the reflective groove 31 is a flat surface, and the normal of the side wall of the reflective groove 31 at any position is perpendicular to the side wall of the reflective groove 31. In this case, the cross-section of the reflective groove 31 is a regular trapezoid.

[0108] In addition, in combination with Figures 14 to 20, the side walls of the reflective groove 31 can also be set as an arc-shaped surface, that is, the side walls of the reflective groove 31 can be a surface with a certain curvature, and at the same time, the side walls of the reflective groove 31 must be inclined in the direction away from the reflective sheet 42, and the normals at all locations are inclined forward relative to the rear side of the diffuser plate 3.

[0109] FIG14 is a schematic diagram of the structure of the reflective groove. As shown in FIG14 , one sidewall of the reflective groove 301 is a concave arc-shaped surface, and the other sidewall is a flat surface. FIG15 is another schematic diagram of the structure of the reflective groove. As shown in FIG14 , both sidewalls of the reflective groove 301 are concave arc-shaped surfaces. FIG16 is a schematic diagram of light reflection of the reflective groove structure shown in FIG15 . FIG17 is another schematic diagram of the structure of the reflective groove. As shown in FIG17 , one sidewall of the reflective groove 301 is a convex arc-shaped surface, and the other sidewall is a flat surface. FIG18 is another schematic diagram of the structure of the reflective groove. As shown in FIG18 , one sidewall of the reflective groove 301 is a concave arc-shaped surface, and the other sidewall is a convex arc-shaped surface. FIG19 is another schematic diagram of the structure of the reflective groove. As shown in FIG19 , both sidewalls of the reflective groove 301 are convex arc-shaped surfaces. FIG20 is a schematic diagram of light reflection of the reflective groove structure shown in FIG19 .

[0110] Further in combination with Figures 14 to 16, at least one side wall of the reflective groove 301 is a concave arc surface, as shown in Figure 16, and the arrows in the figure indicate the incident direction and the outgoing direction of the light. It can be seen that when the side wall of the reflective groove 301 is a concave arc surface, the light hitting the side wall of the reflective groove 301 can still be emitted upward after reflection; in combination with Figures 17 to 20, at least one side wall of the reflective groove 301 is a convex arc surface, as shown in Figure 20, and the arrows in the figure indicate the incident direction and the outgoing direction of the light. It can be seen that when the side wall of the reflective groove 301 is a convex arc surface, the light hitting the side wall of the reflective groove 301 can also be emitted upward after reflection, thereby increasing the light intensity at the joint 101 and solving the problem of dark shadows at the joint 101.

[0111] Furthermore, the reflective layer is a film layer with a reflective function. In some embodiments, the reflective layer can be made of photosensitive solder resist white oil or white glue. The high reflectivity of the photosensitive solder resist white oil and white glue can be used to change the direction of light and make the light more concentrated at the joint 101.

[0112] In some embodiments, the depth of the reflective grooves 31 is H, and the thickness of the diffuser plate 3 is T, where T / 3 ≤ H ≤ 2T / 3. When the depth of the reflective grooves 31 is small, the sidewall area of ​​the reflective grooves 31 is small, failing to effectively redirect light. When the depth of the reflective grooves 31 is large, the thickness of the diffuser plate 3 at the reflective grooves 31 is small, affecting the overall strength of the diffuser plate 3. Setting the depth of the reflective grooves 31 to between one-third and two-thirds of the thickness of the diffuser plate 3 ensures both the reflective effect of the reflective grooves 31 and the strength of the diffuser plate 3 meeting the required performance.

[0113] In some embodiments, T=4.5 mm, 1.5 mm≤H≤3 mm.

[0114] In order to ensure a smaller light mixing distance, the height of the protective glue dot 122 on the surface of the LED chip 121 is currently 0.3mm to 0.5mm. The diffuser plate 3 can be placed directly on the top of the protective glue dot 122. Although this can achieve a smaller light mixing distance, due to the concentration of heat on the top of the LED chip 121, the temperature is too high, which affects the thermal stability of the diffuser plate 3 and easily causes deformation and expansion and contraction of the diffuser plate 3, thereby affecting the normal use of the entire backlight module.

[0115] Furthermore, as shown in Figure 21, a support member 13 can be provided on the LED lamp board 41. The height of the support member 13 is greater than the height of the protective glue point 122 wrapped on the LED chip 121. After the assembly is complete, the support member 13 is used to support the diffuser plate 3 in the front and ensure that there is a certain distance between the diffuser plate 3 and the protective glue point 122. It can not only maintain the mixing distance, but also avoid direct contact between the diffuser plate 3 and the protective glue point 122, thereby avoiding the impact of the temperature increase of the protective glue point 122 on the diffuser plate 3.

[0116] In order to support the diffuser plate 3 in front of the LED light board 41, a support structure needs to be provided inside the LED light board 41. In the prior art, the support structure is usually in the form of a support column, which is provided on the PCB board 11. The support column generally needs to be manufactured independently and then installed on the LED light board 41. The support column is mostly composed of two parts: a base and a pillar. The bottom of the base is connected to the PCB board 11, the pillar is located on the base, and the diffuser plate 3 is provided on the top of the pillar. The structure of the support column is relatively complex, resulting in high manufacturing costs, which is not conducive to reducing the overall cost of the LCD screen. In addition, the setting of the support column requires planning its installation position in advance, and the installation position needs to be reserved on the PCB board 11, and the support structure cannot be flexibly set.

[0117] In view of this, in some embodiments, the support member 13 can be formed by a dispensing process, selecting a suitable colloid, and using a device for dispensing the LED chips 121 to set the support member 13 between the LED chips 121. The support member 13 is made of a colloid with a viscosity greater than or equal to that of the protective coating.

[0118] For example, the support member 13 can be made of a colloid with a viscosity greater than that of the protective glue dots 122. In this way, with the same amount of glue used, the height of the support member 13 is greater than that of the chip protective glue dots 122. For another example, the support member 13 can also be made of the same colloid as that of the protective glue dots 122, but a larger amount of glue is needed to make the height of the support member 13 greater than that of the protective glue dots 122.

[0119] In some embodiments, the support member 13 may be made of a transparent colloid, which is beneficial to improving the luminous effect of the LED light board 41 and further beneficial to improving the display effect of the liquid crystal screen.

[0120] During the LED surface sealing process, support members 13 are installed between LED chips 121 through dispensing. Their height, K, satisfies the following criteria: 0.5mm≤K≤0.9mm. These members support diffuser plate 3 and maintain the light mixing distance. Furthermore, the dispensing process for support members 13 and protective adhesive dots 122 on LED chips 121 is performed simultaneously, eliminating the need for additional mounting brackets and adhesive, thus optimizing production efficiency and improving profitability.

[0121] The shape of the support member 13 formed by the dispensing process is roughly hemispherical, that is, it is elliptical when viewed from the side and circular when viewed from the top. The radius D of the support member 13 is greater than the height K.

[0122] The support members 13 are located between the four LED chips 121 and arranged in alternate rows in the horizontal and vertical directions.

[0123] In some embodiments, the diameter d of the protective glue dot 122 is 1 mm to 3 mm, the height L is 0.3 mm to 0.5 mm, the diameter D of the support member 13 is 3 mm to 5 mm, and 0.5≤K≤0.9 mm.

[0124] In some embodiments, the manufacturing process of the support member 13 may include the following steps S1 to S4:

[0125] S1, select the colloid and install it on the dispensing equipment;

[0126] S2, fixing the LED chip 121 on the PCB board 11, and dispensing protective glue dots 122 on the LED chip 121 using a dispensing device to form an LED assembly 12;

[0127] S3, using a dispensing device to dispense glue between the LED components 12 on the PCB board 11 to form a support member 13, wherein the height of the support member 13 is greater than the height of the LED components 12;

[0128] S4, curing the chip protection glue point 122 and the support member 13.

[0129] The colloid used in step S1 can be the same as that used for chip protection glue dots 122. In this case, the same glue dispensing equipment can be used in steps S2 and S3 to dispense chip protection glue dots 122 and support member 13. The amount of glue used in step S3 to dispense support member 13 is greater than the amount used in step S2 to dispense chip protection glue dots 122. Using the same glue dispensing equipment to dispense both types of glue dots can reduce the equipment required for production, simplify the production process, and reduce production costs.

[0130] The colloid in step S1 can also be selected to have a viscosity greater than that of the chip protection glue dots 122. In this case, different dispensing equipment is required in steps S2 and S3 to dispense the chip protection glue dots 122 and support member 13. However, the amount of colloid used in step S3 to dispense the support member 13 does not need to be greater than the amount of colloid used in step S2 to dispense the chip protection glue dots 122. Selecting a colloid with a viscosity greater than that of the chip protection glue dots 122 can save colloid usage, and the dispensed support member 13 is relatively smaller in size, which is more suitable for situations where the gap between LED components 12 is small.

[0131] In step S4 , the chip protection glue dots 122 and the support member 13 are cured by thermal curing or UV curing.

[0132] As mentioned above, the backlight module of the embodiment of the present disclosure can be made of LED material (such as mini LED). It mainly uses a huge number of mini LED crystals as light sources, which can not only achieve the thinness of the backlight module, but also achieve more refined dynamic control and improve the dynamic contrast of the liquid crystal display. However, due to the reduced spacing between the light sources in the display device, the emitted light of the light source will leak over the adjacent light sources. When performing regional dimming, there will be obvious halos at the junction of adjacent partitions, which will affect the display effect. In this regard, the relevant solution is to prepare a dam bracket around the light source by injection molding, and solve the problem of light source leakage by the dam bracket. However, due to the limited mold size of the dam bracket, when applied to larger-sized display device products, the dam bracket needs to be spliced ​​with multiple boards, and the splicing seams are prone to cause the problem of splicing seam shadows, such as shown in Figures 22 to 24.

[0133] Figure 22 is a schematic diagram of the module structure in a related solution. As shown in Figure 22, as the number of Mini LEDs (light sources) increases, the spacing between light sources 100 decreases. Light sources 100 emit initial light at a first divergence angle, and some light leaks over adjacent light sources. During zone dimming, a noticeable halo appears at the junction of adjacent zones, affecting display contrast.

[0134] Figure 23 is another schematic diagram of the module structure in a related solution. The related solution employs a dam bracket 400 disposed between the diffuser plate 3 and the circuit substrate 300 to reflect a portion of the light emitted by the light source 100. The reflected light from the dam bracket 400 is emitted at a second divergence angle, which is smaller than the first divergence angle. This arrangement converges some of the light that would otherwise leak over other adjacent light sources, preventing it from leaking over other adjacent light sources 100. Therefore, when performing zone dimming, there is no halo at the junction of adjacent partitions, improving the display quality.

[0135] However, the dam support 400 in Figure 23 must be manufactured by injection molding. Figure 24 shows a schematic diagram of the dam support structure in a related solution. This approach has the drawback of limited mold size. When applied to larger products, the dam support 400 must be assembled from multiple panels, creating seams at the joints and causing shadows.

[0136] In view of this, the backlight module of the embodiment of the present disclosure may also include, as shown in FIG25 :

[0137] The diffuser plate 3 has a first side surface, the first side surface is arranged in contact with the second side surface, and a first accommodating cavity 201 is arranged on the first side surface of the diffuser plate 3;

[0138] The light board 4 includes: a circuit substrate 300 and a light-emitting unit 500; wherein the circuit substrate 300 includes at least a second side surface; the light-emitting unit 500 is disposed in the first accommodating cavity 201 and is fixed to the circuit substrate 300;

[0139] The reflecting unit 600 is arranged in the first accommodating cavity 201, and is arranged around the light-emitting unit 500 in a direction perpendicular to the plane where the circuit substrate 300 is located; wherein the light-emitting unit 500 emits initial light at a first divergence angle, and part of the initial light is emitted to the reflecting unit 600, and the reflecting unit 600 reflects the initial light and emits reflected light at a second divergence angle, and the second divergence angle is smaller than the first divergence angle.

[0140] Thus, by providing a first accommodating cavity 201 on the first side surface of the diffuser plate 3 and directly placing the reflective unit 600 for reflecting light within the first accommodating cavity 201, the diffuser plate 3 is directly bonded to the circuit substrate 300. This eliminates the need for a mold for the dam support 400, eliminates the need for multiple panels to be spliced ​​together, and solves the problem of shadows at the splicing seams. The reflective unit 600 can reflect the light emitted by the light-emitting unit 500, resulting in a second divergence angle corresponding to the reflected light being smaller than the first divergence angle corresponding to the initial light. This prevents light leakage from the light-emitting unit 500 and improves the display quality.

[0141] In the disclosed embodiment, the circuit substrate 300 represents a functional unit for supporting the backlight module, such as a printed circuit board (PCB). The diffuser 3 is used to guide the direction of light to ensure uniform brightness. The light-emitting unit 500 represents a functional unit capable of emitting light, such as a mini LED (light-emitting diode).

[0142] In some embodiments, there may be multiple light-emitting units 500, and the light-emitting units 500 are arranged in an array on the circuit substrate 300. Since the spacing between the light-emitting units 500 is small, after any light-emitting unit 500 emits initial light at the first divergence angle α1, a portion of the light will be emitted toward the top of the adjacent light-emitting unit 500, thereby affecting the display effect.

[0143] The reflecting unit 600 represents a functional unit for reflecting the optical fiber. In some embodiments, there may be multiple reflecting units 600 , and they may correspond one-to-one to the light-emitting units 500 .

[0144] Figure 26 is a schematic diagram of an optical path according to some embodiments. A reflective unit 600 is configured to reflect the initial light emitted by its corresponding light-emitting unit 500 toward the upper portion of an adjacent light-emitting unit 500. The reflected light then exits at a second divergence angle α2, which is smaller than the first divergence angle α1. The reflected light shown in Figure 26 is directed vertically upward, so the second divergence angle is indicated as 0°.

[0145] In some embodiments, the second divergence angle should ensure that the reflected light can no longer be emitted above the light emitting unit 500 adjacent to the light emitting unit 500 .

[0146] Therefore, the embodiment of the present disclosure directly sets the reflection unit 600 in the first accommodating cavity 201, and does not need to be injection molded by an injection molding template. Therefore, there is no problem of dark shadows at the splicing seam due to the limited size of the injection molding template, and true 0OD (OD represents the distance between the diffuser plate 3 and the circuit substrate 300) is achieved. In addition, since the initial light emitted by the light-emitting unit 500 can be reflected by the reflection unit 600, the initial light can be prevented from leaking to the top of the adjacent light-emitting unit 500, which is beneficial to improving the display effect of the display device corresponding to the backlight module.

[0147] FIG27 is another structural diagram of a backlight module according to some embodiments. In some embodiments, the reflective unit 600 includes:

[0148] The first reflective portion 601 is disposed on the second side surface of the circuit substrate 300 and is parallel to the second side surface of the circuit substrate 300;

[0149] The second reflective portion 602 is disposed on the inner wall of the diffusion plate 3 in the first accommodating cavity 201 , and the first reflective portion 601 and the second reflective portion 602 are in contact with each other.

[0150] The reflective unit 600 can be divided into a first reflective portion 601 and a second reflective portion 602. In the embodiment of the present disclosure, the first reflective portion 601 and the second reflective portion 602 can be prepared in different ways. Specifically, the first reflective portion 601 and the second reflective portion 602 can both be made of white oil. A white oil reflective layer can be formed on the second side surface of the circuit substrate 300 by coating or laminating, and the white oil reflective layer is patterned to form the first reflective portion 601. The second reflective portion 602 can be formed on the inner wall of the diffuser plate 3 within the first accommodating cavity 201 by coating. After the first side surface of the diffuser plate 3 is attached to the second side surface of the circuit substrate 300, the first reflective portion 601 and the second reflective portion 602 are in contact with each other. Since an OOD is provided between the diffuser plate 3 and the circuit substrate 300, and the first reflective portion 601 and the second reflective portion 602 are in contact with each other, a relatively closed space is formed on the second side surface of the circuit substrate 300, thereby preventing light from leaking from between the diffuser plate 3 and the circuit substrate 300 to above the adjacent light-emitting unit 500, further preventing light leakage, and thus facilitating an improvement in the display effect of the display device corresponding to the backlight module.

[0151] FIG28 is another structural diagram of a backlight module according to some embodiments. In some embodiments, the projection width of the second reflective portion 602 on the circuit substrate 300 is less than or equal to one quarter of the diameter of the first accommodating cavity 201 .

[0152] 28 , the inner wall of the first accommodating cavity 201 can be arranged in an arc shape, and the second reflective portion 602 matches the inner wall of the first accommodating cavity 201 and is also arranged in an arc shape, thereby achieving a better reflection effect.

[0153] Furthermore, if the projection width of the second reflective portion 602 on the circuit substrate 300 is too large, the opening of the second reflective portion 602 will be too small, thereby affecting the light emitted by the backlight module, and further significantly affecting the display effect of the display device corresponding to the backlight module. After research, it was found that the projection width of the second reflective portion 602 on the circuit substrate 300 is less than or equal to one-quarter of the diameter of the first accommodating cavity 201. This can achieve a better reflection effect and prevent the light emitted by the light-emitting unit 500 from being emitted above the adjacent light-emitting unit 500, while also avoiding a significant impact on the light emitted by the light-emitting unit 500, resulting in a large amount of light being unable to be emitted. In Figure 28, the diameter of the first accommodating cavity 201 is indicated as K, and the projection width of the second reflective portion 602 on the circuit substrate 300 is indicated as L, where L≤1 / 4K.

[0154] In some embodiments, the projection width of the second reflective portion 602 on the circuit substrate 300 may be less than or equal to 1 mm.

[0155] FIG. 29 is another structural diagram of a backlight module according to some embodiments. In some embodiments, the projection range of the second reflective portion 602 on the circuit substrate 300 is located outside the light-emitting unit 500 .

[0156] In some embodiments, the projection range of the second reflective portion 602 on the circuit substrate 300 can be set outside the light-emitting unit 500, thereby achieving the same or at least similar effect as the corresponding embodiment of Figure 28, which will not be repeated here.

[0157] FIG30 is another structural diagram of a backlight module according to some embodiments. In some embodiments, a second accommodating cavity 202 is provided on the first side of the diffuser plate 3. The backlight module further includes:

[0158] The driver chip 700 is disposed in the second accommodating cavity 202 and fixed on the second side surface of the circuit substrate 300;

[0159] The driving chip 700 is electrically connected to the light emitting unit 500 , and the driving chip 700 is configured to control the light emitting unit 500 to emit light.

[0160] In some embodiments, the circuit substrate 300 is a single-sided backlight module, that is, the driving chip 700 and the light-emitting unit 500 are both disposed on the first side surface of the diffusion plate 3 .

[0161] In some embodiments, the diffuser plate 3 may further include a second accommodating cavity 202 for accommodating a driver chip 700. The driver chip 700 may be electrically connected to the light emitting unit 500 to control the light emitting unit 500 to emit light. The driver chip 700 may be an IC chip.

[0162] The first reflective portion 601 is formed by patterning a white oil reflective layer on the second side surface of the circuit substrate 300. Therefore, the first reflective portion 601 may or may not be retained in the second accommodating cavity 202, and this is not limited in the present embodiment.

[0163] In some embodiments, if the first reflective portion 601 is retained in the second accommodating cavity 202 , the projection width of the first reflective portion 601 on the circuit substrate 300 may be less than or equal to one quarter of the diameter of the first accommodating cavity 201 .

[0164] FIG31 is another structural diagram of a backlight module according to some embodiments. In some embodiments, a third accommodating cavity 203 is provided on the first side surface of the diffuser plate 3. The backlight module further includes:

[0165] The cross-line resistor 801 and / or the cross-line capacitor 802 are disposed in the third accommodating cavity 203 and fixed on the second side surface of the circuit substrate 300;

[0166] The cross-line resistor 801 and / or the cross-line capacitor 802 are electrically connected between the driving chip 700 and the light-emitting unit 500 .

[0167] In some embodiments, the number of light-emitting units 500 and driver chips 700 is too large, and the wiring is complicated. Therefore, it is necessary to provide a cross-line resistor 801 and / or a cross-line capacitor 802 to connect the driver chip 700 and the light-emitting unit 500. Based on this, a third accommodating cavity 203 can be provided on the first side surface of the diffuser plate 3 to accommodate the cross-line resistor 801 and / or the cross-line capacitor 802.

[0168] Since the embodiment of the present disclosure is provided with a first accommodating cavity 201, a second accommodating cavity 202 and a third accommodating cavity 203 for accommodating the light-emitting unit 500, the driver chip 700 and the cross-line resistor 801 and / or the cross-line capacitor 802, respectively, the first side surface of the diffusion plate 3 can be directly bonded to the second side surface of the circuit substrate 300, thereby realizing true OOD.

[0169] In some embodiments, the diameters and cavity heights of the first accommodating cavity 201, the second accommodating cavity 202, and the third accommodating cavity 203 may be the same or different, where the cavity height represents the maximum distance between the inner walls of the first accommodating cavity 201, the second accommodating cavity 202, and the third accommodating cavity 203 and the second side surface of the circuit substrate 300 in a direction perpendicular to the second side surface of the circuit substrate 300.

[0170] For example, if the driver chip 700 is smaller, the diameter and cavity height of the second accommodating cavity 202 can be smaller. If the light-emitting unit 500 is larger, the diameter and cavity height of the first accommodating cavity 201 can be larger. However, it should be noted that if the first accommodating cavity 201, the second accommodating cavity 202, and the third accommodating cavity 203 have different sizes, the manufacturing process of the first accommodating cavity 201, the second accommodating cavity 202, and the third accommodating cavity 203 may be more complicated. Therefore, in the embodiment of the present disclosure, the first accommodating cavity 201, the second accommodating cavity 202, and the third accommodating cavity 203 are preferably provided with the same size.

[0171] FIG32 is another structural diagram of a backlight module according to some embodiments; in some embodiments, a fixed protection structure 900 is provided on the side of the light emitting unit 500;

[0172] The fixing protection structure 900 is used to fix and protect the light emitting unit 500 and to converge the light emitted by the light emitting unit 500 .

[0173] In some embodiments, the fixed protective structure 900 can be a transparent adhesive dispensed onto the surface of the light-emitting unit 500 and secured to the second side surface of the circuit substrate 300. Thus, the fixed protective structure 900 secures and protects the light-emitting unit 500. The fixed protective structure 900 has a raised structure above it, and the fixed protective structure 900 itself is transparent, allowing light to pass through. Therefore, the fixed protective structure 900 can converge the light emitted by the light-emitting unit 500, reducing the initial divergence angle of the optical fiber emitted by the light-emitting unit 500.

[0174] Continuing to refer to FIG. 32 , in some embodiments, a gap is left between the fixed protection structure 900 and the inner wall of the first accommodating cavity 201 in a direction perpendicular to the second side surface of the circuit substrate 300 .

[0175] In some embodiments, a gap may be left between the fixed protective structure 900 and the inner wall of the first accommodating cavity 201. Specifically, the width of the gap may be less than or equal to 1 mm. This prevents collision or friction between the fixed protective structure 900 and the inner wall of the first accommodating cavity 201, which could affect the structure of the fixed protective structure 900 and / or the inner wall of the first accommodating cavity 201 and, in turn, prevent the light emitted by the light-emitting element from being affected.

[0176] FIG33 is another structural diagram of a backlight module according to some embodiments. In some embodiments, the circuit substrate 300 further includes a third side surface opposite to the second side surface; the backlight module further includes:

[0177] The cross-line resistor 801 and / or the cross-line capacitor 802 and the driver chip 700 are disposed on the third side surface of the circuit substrate 300;

[0178] The cross-line resistor 801 and / or the cross-line capacitor 802 are electrically connected between the driver chip 700 and the light-emitting unit 500 . The driver chip 700 is configured to control the light-emitting unit 500 to emit light.

[0179] In some embodiments, the circuit substrate 300 may also be a double-sided substrate, that is, the driver chip 700 is disposed on the third side of the circuit substrate 300, and the light-emitting unit 500 is disposed on the second side of the circuit substrate 300. The circuit substrate 300 may be provided with a through hole, and the light-emitting unit 500 and the driver chip 700 are electrically connected via the through hole in the circuit substrate 300.

[0180] FIG34 is another structural schematic diagram of a backlight module according to some embodiments; the present disclosure also provides a method for preparing a backlight module, which is used to prepare the backlight module as described in any one of FIG25 to FIG34 . The method may include the following steps S101 to S106:

[0181] S101, providing a diffusion plate;

[0182] S102, setting a first accommodating cavity on a first side surface of the diffuser plate;

[0183] S103, setting a reflection unit in the first accommodating cavity;

[0184] S104, providing a circuit substrate;

[0185] S105, disposing a light-emitting unit on the second side surface of the circuit substrate;

[0186] S106 , attaching the first side surface of the diffusion plate and the second side surface of the circuit substrate to each other, and disposing the light-emitting unit in the first accommodating cavity.

[0187] In the embodiments of the present disclosure, after the size of the backlight module is determined, a diffusion plate 3 of corresponding size may be provided. FIG35 is a schematic structural diagram of a diffusion plate according to some embodiments.

[0188] Subsequently, a first accommodating cavity 201 can be formed on the first side of the diffuser plate 3 by laser etching, while also forming a second accommodating cavity 202 and a third accommodating cavity 203. Figure 36 is another schematic diagram of the structure of a diffuser plate according to some embodiments. Since the dimensions of the diffuser plate 3 directly match those of the backlight module, no splicing is required.

[0189] After forming the first accommodating cavity 201 on the first side of the diffuser plate 3, a white oil coating (ie, the second reflective portion 602) may be formed on the inner wall of the first accommodating cavity 201 by coating. FIG37 is another structural diagram of a diffuser plate according to some embodiments.

[0190] The embodiments of the present disclosure may provide a circuit substrate 300 that matches the size of a backlight module. FIG38 is a schematic diagram of the circuit substrate structure according to some embodiments.

[0191] After providing the circuit substrate 300, a white oil reflective layer 603 may be formed on the second side surface of the circuit substrate 300 by coating or laminating. Fig. 39 is another schematic structural diagram of a circuit substrate according to some embodiments.

[0192] After the white oil reflective layer 603 is formed on the circuit substrate 300, the white oil reflective layer 603 may be patterned to form the first reflective portion 601 in the reflective unit 600. Figure 40 is another schematic structural diagram of a circuit substrate according to some embodiments.

[0193] In some embodiments, a light-emitting unit 500 can be set at a corresponding position of the circuit substrate 300 based on the structure in Figure 41. At the same time, a driving chip 700, a cross-line resistor 801 and / or a cross-line capacitor 802 can also be set, and the driving chip 700 is electrically connected to the light-emitting unit 500 through the cross-line resistor 801 and / or the cross-line capacitor 802. Figure 41 is a schematic diagram of another circuit substrate structure according to some embodiments. It should be noted that Figure 41 does not illustrate the corresponding electrical connection relationship between the light-emitting unit 500, the driving chip 700, the cross-line resistor 801 and / or the cross-line capacitor 802.

[0194] After the light-emitting unit 500 is provided, a fixed protection structure 900 (eg, transparent glue) may be provided on the surface of the light-emitting unit 500 to fix and protect the light-emitting unit 500 . FIG42 is another structural diagram of a circuit substrate according to some embodiments.

[0195] After setting the fixed protection structure 900, the diffuser plate 3 can be attached to the circuit substrate 300. Specifically, the embodiment of the present disclosure can attach the diffuser plate 3 to the circuit substrate 300 by means of Mark alignment, the light-emitting unit 500 is arranged in the first accommodating cavity 201, the driving chip 700 is arranged in the second accommodating cavity 202, and the cross-line resistor 801 and / or the cross-line capacitor 802 are arranged in the third accommodating cavity 203 to form a backlight module. Figure 43 is another structural schematic diagram of the backlight module according to some embodiments. In addition, the backlight module may also include a quantum dot layer and an optical film arranged in sequence on the fourth side of the diffuser plate 3 and in a direction away from the fourth side. Among them, the fourth side is the side opposite to the first side, and the embodiment of the present disclosure is no longer shown by an image.

Claims

1. A display device, comprising: a backplane; a middle frame disposed along the edge of the backplane, and the middle frame includes a first bearing portion which is fixedly attached to the front side of the backplane; a display panel, the edge of the display panel is fixedly attached to the side of the first bearing portion away from the backplane, and an installation space is formed between the display panel and the backplane; a backlight module disposed in the installation space; the backlight module includes a lamp board and a diffusion plate, and the diffusion plate is disposed on the front side of the lamp board; wherein, there is an installation gap between the diffusion plate and the side surface of the first bearing portion, and a fixing glue block is disposed in the installation gap, one side of the fixing glue block is bonded to the diffusion plate, and the other side is bonded to the side surface of the first bearing portion.

2. The display device according to claim 1, wherein the fixing glue block includes a first glue block formed on the side surface of the diffusion plate and a second glue block formed between the diffusion plate and the backplane.

3. The display device according to claim 2, wherein the cross-sectional shape of the fixing glue block is L-shaped.

4. The display device according to claim 1, wherein the side surface of the first bearing portion protrudes towards the direction close to the lamp board to form a support platform, and the support platform is attached to the rear side surface of the diffusion plate for supporting the diffusion plate.

5. The display device according to claim 4, wherein the side of the support platform away from the diffusion plate is flush with the rear side surface of the first bearing portion and is attached to the backplane.

6. The display device according to claim 1, wherein the fixing glue block is an ultraviolet curable glue.

7. The display device according to claim 1, wherein the fixing glue block is a transparent colloid.

8. The display device according to claim 1, wherein the fixing glue block is continuously disposed around the diffusion plate.

9. The display device according to claim 1, wherein the number of the fixing glue blocks is multiple, and the multiple fixing glue blocks are spaced apart around the diffusion plate.

10. The display device according to claim 1, wherein the fixing glue block is disposed at least on one side of the diffusion plate.

11. The display device according to any one of claims 1-10, wherein the lamp board in the backlight module is an LED lamp board, the number of the LED lamp boards is multiple, and the multiple LED lamp boards are arranged in an array, and a seam is formed between adjacent LED lamp boards; the backlight module further includes: a reflective sheet, the reflective sheet is disposed on the front side of each LED lamp board one by one, and adjacent reflective sheets overlap at the seam; the diffusion plate is disposed on the front side of the reflective sheet, and a light mixing gap is formed between the diffusion plate and the reflective sheet; wherein, a reflective groove is recessed at a position corresponding to the seam on the rear side surface of the diffusion plate, the side wall of the reflective groove is inclined towards the side away from the reflective sheet, and a reflective layer is provided on the side wall of the reflective groove.

12. The display device according to claim 11, wherein at least one side wall of the reflective groove is a plane, an inward concave arc surface or an outward convex arc surface.

13. The display device according to claim 11, wherein the normal line of the side wall of the light reflection groove at any position inclines forward relative to the rear side surface of the diffusion plate, and the light rays reflected by the two side walls of the light reflection groove converge directly in front of the seam.

14. The display device according to claim 11, wherein the width of the light reflection groove gradually increases from the groove opening to the groove bottom.

15. The display device according to claim 11, wherein the light reflection groove is disposed opposite to the seam, and the central plane of the light reflection groove and the central plane of the seam are in the same plane.

16. The display device according to claim 11, wherein the width of the groove opening of the light reflection groove is greater than or equal to the width of the seam, and the projection of the seam on the rear side surface of the diffusion plate completely falls within the groove opening of the light reflection groove.

17. The display device according to claim 11, wherein the depth of the light reflection groove is h, the thickness of the diffusion plate is T, and the depth h of the light reflection groove is between one-third and two-thirds of the thickness T of the diffusion plate.

18. The display device according to claim 11, wherein the trend of the light reflection groove on the diffusion plate is consistent with the corresponding seam.

19. The display device according to claim 11, wherein the LED light board comprises a PCB board, a support member and an LED assembly disposed on the PCB board, the height of the support member is greater than the height of the LED assembly, and the support member is used for supporting the diffusion plate; the reflective sheet is respectively provided with openings for exposing the support member and the LED assembly at positions corresponding to the support member and the LED assembly.

20. The display device according to claim 19, wherein the support member is formed by a dispensing process using a transparent colloid, and the viscosity of the colloid selected for the support member is greater than or equal to the viscosity of the colloid selected for the protective colloid.

21. The display device according to any one of claims 1-10, wherein the diffusion plate has a first side surface, the first side surface is attached to a second side surface, and the diffusion plate is provided with a first accommodation cavity on the first side surface; The lamp board includes: A circuit board and a light emitting unit; The circuit board at least comprises the second side surface; The light emitting unit is disposed in the first accommodation cavity and is fixedly disposed with the circuit board; The backlight module further comprises: A reflection unit disposed in the first accommodation cavity, and in a direction perpendicular to the plane where the circuit board is located, the reflection unit is disposed around the light emitting unit; wherein, the light emitting unit emits initial light rays at a first divergence angle, and part of the initial light rays are emitted to the reflection unit, and the reflection unit reflects the initial light rays and emits reflected light rays at a second divergence angle, and the second divergence angle is smaller than the first divergence angle.

22. The display device according to claim 21, wherein the reflection unit comprises: A first reflection portion disposed on the second side surface of the circuit board and parallel to the second side surface of the circuit board; A second reflection portion disposed on the inner wall of the diffusion plate in the first accommodation cavity, and the first reflection portion is in contact with the second reflection portion.

23. The display device according to claim 22, wherein a projection width of the second reflection portion on the circuit board is less than or equal to one quarter of a diameter of the first accommodation cavity.

24. The display device according to claim 21, wherein a second accommodation cavity is provided on the first side surface of the diffusion plate; the backlight module further includes: a driving chip, which is arranged in the second accommodation cavity and fixed on the second side surface of the circuit board; the driving chip is electrically connected to the light-emitting unit, and the driving chip is configured to control the light-emitting unit to emit light.

25. The display device according to claim 24, wherein a third accommodation cavity is provided on the first side surface of the diffusion plate; the backlight module further includes: a jumper resistor and / or a jumper capacitor, which is arranged in the third accommodation cavity and fixed on the second side surface of the circuit board; the jumper resistor and / or the jumper capacitor is electrically connected between the driving chip and the light-emitting unit.

26. The display device according to claim 21, wherein a fixing and protecting structure is provided on a side surface of the light-emitting unit; the fixing and protecting structure is used for fixing and protecting the light-emitting unit and converging light emitted by the light-emitting unit.

27. The display device according to claim 26, wherein a gap is left between the fixing and protecting structure and an inner wall of the first accommodation cavity in a direction perpendicular to the second side surface of the circuit board.

28. The display device according to claim 21, wherein the circuit board further includes a third side surface opposite to the second side surface; the display device further includes: a jumper resistor and / or a jumper capacitor and a driving chip, which are arranged on the third side surface of the circuit board; the jumper resistor and / or the jumper capacitor is electrically connected between the driving chip and the light-emitting unit, and the driving chip is configured to control the light-emitting unit to emit light.

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