Patent Publication Number: US-2023161192-A1

Title: Backlight module and liquid crystal display panel

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application claims priority under 35 U.S.C. § 119(a) to Chinese Patent Application No. 202111391139.X, filed Nov. 22, 2021, the entire disclosure of which is incorporated herein by reference. 
     TECHNICAL FIELD 
     The disclosure relates to the field of display, and more particularly, to a backlight module and a liquid crystal display panel. 
     BACKGROUND 
     Quantum Dot Mini Light Emitting Diodes (QD-mini LED) relate to a display technology that combines quantum dots with Mini Light Emitting Diodes (mini LED). Existing QD-mini LED is poor in heat dissipation. 
     SUMMARY 
     In a first aspect, the disclosure provides a backlight module. The backlight module includes a substrate, multiple light emitting diodes, a quantum dot layer, a light-shielding layer, and a heat dissipation structure. The substrate has a first surface and a second surface opposite to the first surface. The multiple light emitting diodes are disposed on the first surface. The quantum dot layer is disposed on one side of the multiple light emitting diodes facing away from the substrate. The multiple light emitting diodes are each configured to emit lights of a first color. The lights of the first color are of the first color, a second color, or a third color after passing through the quantum dot layer. A mixture of the first color, the second color, and the third color is white. The light-shielding layer is disposed between each two adjacent light emitting diodes. The heat dissipation structure is disposed on the second surface. 
     In a second aspect, the disclosure further provides a liquid crystal display panel. The liquid crystal display panel includes a liquid crystal module and a backlight module. The backlight module includes a substrate, multiple light emitting diodes, a quantum dot layer, a light-shielding layer, and a heat dissipation structure. The substrate has a first surface and a second surface opposite to the first surface. The multiple light emitting diodes are disposed on the first surface. The quantum dot layer is disposed on one side of the multiple light emitting diodes facing away from the substrate. The multiple light emitting diodes are each configured to emit lights of a first color. The lights of the first color are of the first color, a second color, or a third color after passing through the quantum dot layer. A mixture of the first color, the second color, and the third color is white. The light-shielding layer is disposed between each two adjacent light emitting diodes. The heat dissipation structure is disposed on the second surface. The liquid crystal module and the backlight module are stacked. The backlight module is configured to emit lights to the liquid crystal module. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       In order to more clearly illustrate technical solutions of implementations of the disclosure or the related art, the following will briefly introduce drawings required for description of implementations or the related art. Obviously, the drawings in the following description are only some implementations of the disclosure. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort. 
         FIG.  1    is a first schematic structural diagram of a backlight module according to embodiments. 
         FIG.  2    is a second schematic structural diagram of a backlight module according to embodiments. 
         FIG.  3    is a third schematic structural diagram of a backlight module according to embodiments. 
         FIG.  4    is a fourth schematic structural diagram of a backlight module according to embodiments. 
         FIG.  5    is a fifth schematic structural diagram of a backlight module according to embodiments. 
         FIG.  6    is a sixth schematic structural diagram of a backlight module according to embodiments. 
         FIG.  7    is a seventh schematic structural diagram of a backlight module according to embodiments. 
         FIG.  8    is a schematic structural diagram of an aluminum extrusion according to embodiments. 
         FIG.  9    is a first schematic structural diagram of a quantum dot layer according to embodiments. 
         FIG.  10    is a second schematic structural diagram of a quantum dot layer according to embodiments. 
         FIG.  11    is a first schematic structural diagram of a first light-shielding layer according to embodiments. 
         FIG.  12    is a second schematic structural diagram of a first light-shielding layer according to embodiments. 
         FIG.  13    is a third schematic structural diagram of a first light-shielding layer according to embodiments. 
         FIG.  14    is a schematic structural diagram of a liquid crystal display panel according to embodiments. 
     
    
    
     Description of reference numbers: 
     100-liquid crystal display panel; 
     10-backlight module, 11-substrate, 111-first surface, 112-second surface, 113-gap, 12-light emitting diode, 121-light emitting surface, 122-side surface, 123-mounting surface, 13-quantum dot layer, 131-first color conversion area, 132-second color conversion area, 133-third color conversion area, 134-connection area, 14-light-shielding layer, 141-first light-shielding layer, 142-second light-shielding layer, 15-heat dissipation structure, 151-thermal conductive coating, 152-heat dissipation sheet, 153-aluminum extrusion, 1531-back ridge, 1532-fin, 16-optical film; 
     20-liquid crystal module. 
     DETAILED DESCRIPTION 
     The following will describe technical solutions of implementations of the disclosure with reference to the drawings. Obviously, implementations described herein are merely some implementations, rather than all implementations, of the disclosure. Based on the implementations described in the disclosure, all other implementations obtained by those of ordinary skill in the art without creative effort shall fall within the protection scope of the disclosure. 
     Referring to  FIG.  1   , embodiments of the disclosure provide a backlight module  10 . 
     The backlight module  10  includes a substrate  11 , multiple light emitting diodes  12 , a quantum dot layer  13 , a light-shielding layer  14 , a heat dissipation structure  15 , and an optical film  16 . 
     The substrate  11  has a first surface  111  and a second surface  112  opposite to the first surface  111 . The multiple light emitting diodes  12  are disposed on the first surface  111 . The quantum dot layer  13  is disposed on one side of the multiple light emitting diodes  12  facing away from the substrate  11 . 
     The multiple light emitting diodes  12  are each configured to emit lights of a first color. The lights of the first color are of the first color, a second color, or a third color after passing through the quantum dot layer  13 . A mixture of the first color, the second color, and the third color is white. 
     The light-shielding layer  14  is disposed between each two adjacent light emitting diodes  12 . The light-shielding layer  14  is used to block stray lights between each two adjacent light emitting diodes  12  to alleviate the problem of optical crosstalk. 
     The heat dissipation structure  15  is disposed on the second surface  112  to absorb the heat transferred by the substrate  11  and dissipate the heat into air around the heat dissipation structure  15 . 
     Specifically, the substrate  11  can be made of phenolic resin, epoxy resin, polyimide, glass, and the like. 
     The light emitting diodes  12  may be conventional Light Emitting Diodes (LED), mini LEDs (LEDs with a size between 50 µm and 200 µm), or micro LEDs (LEDs with a size smaller than 50 µm). The multiple light emitting diodes  12  are arranged in an array on the first surface  111  of the substrate  11 . The multiple light emitting diodes  12  emit lights of the first color when the multiple light emitting diodes are on. 
     The quantum dot layer  13  can be a flexible film, a hard glass plate, or the like. The quantum dot layer  13  includes a first color conversion area  131 , a second color conversion area  132 , and a third color conversion area  133 . The second color conversion area  132  may be provided with red quantum dots or quantum dots of other colors. The third color conversion area  133  may be provided with green quantum dots or quantum dots of other colors. Lights of the first color are converted into lights of the second color after passing through the second color conversion area  132 . Lights of the first color are converted into lights of the third color after passing through the third color conversion area  133 . 
     Specifically, referring to  FIG.  9   , a connection area  134  may be between the first color conversion area  131  and the second color conversion area  132 , or between the second color conversion area  132  and the third color conversion area  133 . The connection area  134  can be made of a reflective material. When the connection area  134  is made of a reflective material, after lights of the first color emitted from the light emitting diodes  12  reach the connection area  134 , the lights emitted from the light emitting diodes  12  can be reflected by the connection area  134 , so that the lights are unable to pass through the quantum dot layer  13 . 
     In this way, the lights of the first color can only pass through the quantum dot layer  13  via the first color conversion area  131  and/or the second color conversion area  132  and/or the third color conversion area  133  and can be converted into corresponding lights of the second color and/or the third color, which can avoid a phenomenon that the lights of the first color pass through the connection area  134  and mix with lights of other colors to cause variegated or mixed colors. 
     The connection area  134  may also be made of a light-transparent material. Specifically, when a large brightness of lights of the first color is required in a local area, the connection area  134  can be made of a light-transparent material, and the lights of the first color emitted from the light emitting diodes  12  can pass through the connection area  134 , which can avoid that the lights of the first color are blocked by the connection area  134  and the transmittance of the lights is reduced. 
     In other embodiments, referring to  FIG.  10   , the first color conversion area  131  and the second color conversion area  132  may also be connected, and the connection of the first color conversion area  131  and the second color conversion area  132  may be between two adjacent light emitting diodes  12 , to avoid that only part of the lights of the first color can pass through the conversion area, so that the brightness of lights of the second color or the third color is too low and the color is not pure. 
     The lights of the first color may be any of blue lights, green lights, red lights, and the like. Further, when the second color conversion area  132  is provided with red quantum dots, the lights of the second color are red, and when the third color conversion area  133  is provided with green quantum dots, the lights of the third color are green. 
     The backlight module  10  further includes multiple pixel units, and each pixel unit includes multiple sub-pixels. The pixel unit includes at least three light emitting diodes  12 , and a first color conversion area  131 , a second color conversion area  132 , or a third color conversion area  133  corresponding to each light emitting diode  12 . Each pixel unit can emit lights of white or other full-color mixed from lights of the first color, the second color, and the third color. 
     Specifically, there may be three light emitting diodes  12  in a pixel unit, and the three light emitting diodes  12  have the same size. The light emitting diodes  12  can be arranged side by side in a straight line, or arranged in a broken line, or the light emitting diodes  12  can also be arranged in a triangle in which the three light emitting diodes  12  are respectively located on the three sides or three corners of the triangle, which is not limited herein. 
     In other embodiments, there may be more than three light emitting diodes  12  in a pixel unit, and lights emitted by at least two of the light emitting diodes  12  are of the same color after passing through the quantum dot layer  13 . 
     In other embodiments, the light emitting diodes  12  can also have different sizes, to reduce the area occupied by a single pixel unit, and more pixel units can be designed in the backlight module  10  with the same area to achieve higher visual brightness. 
     After the multiple light emitting diodes  12  are on, part of lights of the first color emitted by the light emitting diodes  12  may be absorbed by the light-shielding layer  14 , and at the same time, the light-shielding layer  14  may also absorb the heat emitted by the light emitting diodes  12  and conduct the heat to the heat dissipation structure  15  via the substrate  11 , for the heat dissipation structure  15  to conduct the heat out of the backlight module  10 . 
     In other embodiments, the heat dissipation structure  15  may be disposed on a part of the second surface  112 , for example, where the light emitting diodes  12  need to be on for a long time or the light emitting diodes  12  are densely arranged, or where the light-shielding layer  14  is dense or thicker. In this way, the heat dissipation of the part of the backlight module  10  where the heat is more serious can be enhanced, and the thickness of the part with less heat in the backlight module  10  is not affected, to reduce the local thickness of the liquid crystal display panel  100 , and other components can be added to the thinner part of the liquid crystal display panel  100 . 
     The optical film  16  is disposed on one side of the quantum dot layer  13  facing away from the light emitting diodes  12 , to improve the brightness of lights passing through. The optical film  16  may include one or more of a diffuser plate, a light guide plate, a brightness enhancement film, a composite brightness enhancement film, a diffuser sheet, and the like. The optical film  16  is made of, including but not limited to, cellulose triacetate, polyvinyl alcohol, acrylic resin, and the like. 
     In the disclosure, the heat dissipation structure  15  is disposed on the second surface  112  of the substrate  11  facing away from the light emitting diodes, and the heat dissipation structure  15  can be used to dissipate the heat generated in the backlight module  10  into air around the heat dissipation structure  15 . After the multiple light emitting diodes  12  are on, part of the lights emitted by the light emitting diodes  12  will be blocked by the light-shielding layer  14 , and the heat generated with the lights will also be absorbed by the light-shielding layer  14 . The heat absorbed by the light-shielding layer  14  and the heat generated by the light emitting diodes  12  will be conducted to the substrate  11  and dissipated together with the heat generated by the substrate  11  via the heat dissipation structure  15  into air around the heat dissipation structure  15 , thereby avoiding the problem that the luminous efficiency of the light emitting diodes  12  is reduced due to the overheating of the backlight module  10 . 
     In embodiments, referring to  FIG.  1   , the multiple light emitting diodes  12  each have a side surface  122 . The side surface  122  and the first surface  111  define an angle. The light-shielding layer  14  includes a first light-shielding layer  141 . The first light-shielding layer  141  covers the side surface  122 . 
     Specifically, the light emitting diode  12  has a light emitting surface  121 , a mounting surface  123  opposite to the light emitting surface  121 , and a side surface  122  connected between the light emitting surface  121  and the mounting surface  123 . The mounting surface  123  faces the first surface  111 . The light emitting surface  121  is used to transmit lights. The angle between the side surface  122  and the first surface  111  may be any angle between 0° and 90°. Preferably, in this embodiment, the angle between the side surface  122  and the first surface  111  is 90°. 
     When lights emitted by the light emitting diodes  12  are emitted through the light emitting surface  121 , part of lights may be emitted through the side surface  122 . Lights of the first color emitted from the light emitting surface  121  may pass through the second color conversion area  132  or the third color conversion area  133  to be converted into lights of the second color or the third color, and lights of the first color emitted from the side surface  122  may reach other positions of the quantum dot layer  13 , which affects the overall light output effect and results in optical crosstalk. 
     For example, taking two light emitting diodes  12  corresponding to the first color conversion area  131  and the second color conversion area  132  as an example, when the light emitting diode  12  of the first color conversion area  131  is on and the light emitting diode  12  of the second color conversion area  132  is off, lights of the first color emitted from the side surface  122  of the light emitting diode  12  which is on will enter the second color conversion area  132 , so that the lights of the first color are converted into lights of the second color, which results in the overall lights to appear impure color. 
     Further, in embodiments, the shape of the light emitting diode  12  may be a cube, and the side surface  122  of the light emitting diode  12  includes a first side surface, a second side surface, a third side surface, and a fourth side surface. The first light-shielding layer  141  may cover one or more of the first side surface, the second side surface, the third side surface, and the fourth side surface. 
     In other embodiments, referring to  FIGS.  11  to  13   , the first light-shielding layer  141  may be disposed in a local area of the side surface  122 , for example, in the middle of the side surface  122 , in a position of the side surface  122  close to or away from the first surface  111 , or the like. When the first light-shielding layer  141  is in a position of the side surface  122  away from the first surface  111 , the first light-shielding layer  141  can shield lights emitted from a position of the side surface  122  of the light emitting diode  12  away from the first surface  111 . When the first light-shielding layer  141  is in a position of the side surface  122  close to the first surface  111 , the first light-shielding layer  141  can shield lights emitted from the position of the side surface  122  of the light emitting diode  12  close to the first surface  111 . When the first light-shielding layer  141  is in the middle of the side surface  122 , the first light-shielding layer  141  can shield lights emitted from the middle of the side surface  122  of the light emitting diode  12 . By disposing the light-shielding layer  14  in a local area of the side surface  122 , lights emitted from the side surface  122  of the light emitting diode  12  can be accurately shielded to save cost. 
     In other embodiments, in a same backlight module  10 , light emitting diodes  12  disposed in some local areas have higher luminous brightness than other areas, and optical crosstalk in these local areas is more obvious than other areas. Therefore, the first light-shielding layer  141  can be disposed in these local areas with higher luminous brightness and can be omitted in other areas to save cost. 
     In other embodiments, in a same backlight module  10 , the distance between two adjacent light emitting diodes  12  disposed in some local areas is smaller than other areas, and optical crosstalk in these local areas is more obvious than other areas. Then, the first light-shielding layer  141  can be only disposed in these local areas with a smaller distance to save cost. 
     Further, the first light-shielding layer  141  can be made of an opaque paint, and the opaque paint can contain, including but not limited to, a polymer material, a reflective material, a light-absorbing material, a hydrophobic material, a carbon material, a dispersant, an active agent, and the like. The polymer material may be a material with curing properties, including but not limited to epoxy resin, Polymethyl Methacrylate (PMMA), silicone rubber, and the like. The hydrophobic material may be polytetrafluoroethylene, polycarbonate, polyacrylonitrile, and the like. A hydrophobic material is contained in the first light-shielding layer  141  to achieve waterproof function and improve water and oxygen barrier properties of the backlight module  10 . 
     The first light-shielding layer  141  may be black or other colors, which is not limited herein. The first light-shielding layer  141  can be made through coating, inkjet printing, physical/chemical vapor deposition, or other procedures. 
     In other embodiments, the first light-shielding layer  141  may also be an opaque adhesive layer. The first light-shielding layer  141  can be formed through coating and curing procedures. 
     In other embodiments, the first light-shielding layer  141  may further contain reflective particles. The material of the reflective particles includes inorganic non-metals and/or metals. The size of the reflective particles is not specifically limited herein. The reflective particles reflect lights of the first color emitted from the side surface  122  after the light emitting diode  12  is on. The lights of the first color return to the light emitting diode  12  after being reflected by the reflective particles, and can be emitted from the light emitting surface  121 , thereby enhancing the intensity of the lights of the first color emitted from the light emitting surface  121  and improving the brightness. 
     The reflective particles can be mixed as constituent raw material with other raw materials during preparation of the first light-shielding layer  141 , to omit the preparation of recombination of the reflective particles and the first light-shielding layer  141 . 
     The reflective particles can also cover the surface of the first light-shielding layer  141 , and after the first light-shielding layer  141  is connected to the side surface  122 , the reflective particles are between the first light-shielding layer  141  and the side surface  122 , to enhance the uniformity of the reflective particles in the first light-shielding layer  141  and improve the reflection efficiency of the lights of the first color by the reflective particles. 
     The first light-shielding layer  141  covers the side surface  122  to block or reflect the lights of the first color on the side surface  122 , which can avoid optical crosstalk. 
     In embodiments, referring to  FIG.  1   , the light-shielding layer  14  further includes a second light-shielding layer  142 , the second light-shielding layer  142  is disposed on the first surface  111 , and the second light-shielding layer  142  connects the first light-shielding layer  141  located on the side surfaces  122  of each two adjacent light emitting diodes  12 . 
     Specifically, any two adjacent light emitting diodes  12  define a gap  113 , and the second light-shielding layer  142  can be disposed in the gap  113 . The composition material of the second light-shielding layer  142  may be the same as or different from the composition material of the first light-shielding layer  141 . 
     In other embodiments, the second light-shielding layer  142  may also be disposed on a part of the first surface  111  to protect local corrosion-prone circuits on the substrate  11 . 
     The thickness of the second light-shielding layer  142  may be the same as or different from the thickness of the first light-shielding layer  141 . Specifically, the thickness of the first light-shielding layer  141  is the thickness in the direction perpendicular to the side surface  122 , and the thickness of the second light-shielding layer  142  is the thickness in the direction perpendicular to the first surface  111 . 
     In other embodiments, when the thickness of the second light-shielding layer  142  is different from the thickness of the first light-shielding layer  141 , the thickness of the second light-shielding layer  142  may be not less than the thickness of the light emitting diode  12 . 
     The second light-shielding layer  142  can be made through coating, inkjet printing, physical/chemical vapor deposition, or other procedures. The second light-shielding layer  142  is disposed on the first surface  111 , which can avoid that the substrate  11  is corroded by water and oxygen and thus the circuit structure on the substrate  11  is affected and problems such as short circuit occur. 
     In embodiments, referring to  FIG.  2   , the heat dissipation structure  15  is a thermal conductive coating  151 . Specifically, a binder or a curing agent may be added to the thermal conductive coating  151  to increase the bonding strength between the thermal conductive coating  151  and the second surface  112  or to make the thermal conductive coating  151  easy to be cured on the second surface  112 . A dispersant, an active agent, or the like may also be added to the thermal conductive coating  151  to improve the uniformity of the thermal conductive coating  151 . 
     The thermal conductive coating  151  can be made through coating, inkjet printing, physical/chemical vapor deposition, or other procedures. 
     In other embodiments, a thermal conductive adhesive may be pre-disposed between the thermal conductive coating  151  and the second surface  112 , and then the thermal conductive coating  151  is made through coating for example. The bonding strength between the thermal conductive coating  151  and the second surface  112  is enhanced by the thermal conductive adhesive, so that the thermal conductive coating  151  is not easy to fall off after being heated. The thermal conductive adhesive includes but is not limited to an acrylate adhesive, an epoxy resin adhesive, an organic silica gel, a polyurethane adhesive, a composite adhesive, and the like. 
     In other embodiments, holes may also be defined on the thermal conductive coating  151 , so that a part of the second surface  112  is in contact with the air, thereby increasing the heat dissipation area of the thermal conductive coating  151  and thus enhancing the heat dissipation of the thermal conductive coating  151 . The holes can be formed by using a coating template with holes, and are integrally formed when the thermal conductive coating  151  is provided, or through cutting or etching procedures after the thermal conductive coating  151  is cured. The shape of the holes may be a circle or a polygon, which is not specifically limited herein. 
     The heat dissipation structure  15  is designed as the thermal conductive coating  151 , which helps to manufacture the thermal conductive coating  151  on the substrate  11  in industrial production and save costs, and the structure of the thermal conductive coating  151  can be designed to enhance the heat dissipation. 
     In an implementation, referring to  FIG.  2   , the thermal conductive coating  151  is made of one or more of aluminum oxide, beryllium oxide, aluminum nitride, and boron nitride. 
     Specifically, the thermal conductive coating  151  may be a single-layer thermal conductive ceramic material. The thermal conductive ceramic material may be a slurry containing only alumina particles, or a mixed slurry containing alumina and aluminum nitride, and can be disposed on the second surface  112  through coating for example. It can be understood that, the slurry of the thermal conductive ceramic material can be a mixture of one or more materials. 
     In other embodiments, referring to  FIG.  3   , the thermal conductive coating  151  may be provided by stacking multiple layers of thermal conductive ceramic materials, to avoid nonuniform preparation of a single-layer thermal conductive coating  151 . Specifically, the thermal conductive coating  151  may include an aluminum oxide coating connected to the second surface  112 , and may also include a beryllium oxide coating connected to the aluminum oxide coating. It can be understood that, a layer of the thermal conductive coating  151  may be a coating only containing one thermal conductive ceramic material, or a mixed coating containing multiple thermal conductive ceramic materials. 
     The multiple layers of thermal conductive coatings  151  can be arranged according to different thermal conductivities of different thermal conductive ceramic materials in descending or ascending order of the thermal conductivities, to enhance the conduction of heat in the heat dissipation structure  15 . 
     In other embodiments, the thermal conductive coating  151  can be made of a graphite sheet, graphene, graphene oxide, silica gel, a glass fiber, and the like. 
     By making the thermal conductive coating  151  with different materials, more efficient thermal conductive coatings  151  can be provided for backlight modules  10  of different sizes or different calorific values. 
     In embodiments, referring to  FIG.  4   , the substrate  11  is made of glass, the heat dissipation structure  15  is a heat dissipation sheet  152 , and the heat dissipation sheet  152  is bonded to the substrate  11 . When a substrate  11  made of glass is used for the backlight module  10 , the heat dissipation structure  15  may be a metal or non-metal sheet. 
     Specifically, the heat dissipation sheet  152  and the substrate  11  may be connected by a thermal conductive adhesive. The heat dissipation sheet  152  can be made of metal, including but not limited to aluminum foil, silver foil, gold foil, and the like, or may also be made of non-metal, including but not limited to a ceramic sheet, a glass fiber sheet, and the like. 
     Further, referring to  FIG.  5   , the heat dissipation sheet  152  may include a single layer or multiple layers. When the heat dissipation sheet  152  include multiple layers, the heat dissipation sheet  152  can be provided by stacking sheets of different materials. 
     In other embodiments, the heat dissipation sheet  152  may define multiple heat dissipation holes (not shown), and the shape of the heat dissipation holes may be circular or polygonal, to increase the surface area of the heat dissipation sheet  152  and improve the heat dissipation performance of the heat dissipation sheet  152 . 
     By providing the heat dissipation structure  15  as the heat dissipation sheet  152  for the glass substrate  11  made of glass, the heat dissipation effect can be enhanced, and short circuit caused by a metal sheet or a conductive sheet on other substrates  11  can be avoided. 
     In embodiments, referring to  FIGS.  6  and  8   , the substrate  11  is a printed circuit board, and the heat dissipation structure  15  is an aluminum extrusion  153 . Specifically, the aluminum extrusion  153  may be disposed on the second surface  112  by Surface Mount Technology (SMT). The aluminum extrusion  153  includes a back ridge  1531  and multiple fins  1532 . The multiple fins  1532  can be arranged in parallel at equal intervals. The multiple fins  1532  each have one end connected to the surface of the back ridge  1531 . One end of the back ridge  1531  facing away from the fins  1532  is connected to the second surface  112 . 
     In other embodiments, the multiple fins  1532  may also be arranged in a non-parallel manner, and ends of any two adjacent fins  1532  may be connected (not shown). In this way, the stability inside the aluminum extrusion  153  can be increased, so that the fins  1532  are not easy to break or damage. 
     In other embodiments, the shape of the fins  1532  may also be helical, to increase the surface area of the fins  1532  and the space inside the aluminum extrusion  153  for the air to flow, thereby increasing the contact area of the aluminum extrusion  153  with the air. 
     By designing the heat dissipation structure  15  as the aluminum extrusion  153 , the effect of large-area heat dissipation can be achieved, and the heat conducted from the substrate  11  to the aluminum extrusion  153  can be dissipated more quickly, thereby enhancing the heat dissipation. 
     In embodiments, referring to  FIG.  6   , the aluminum extrusion  153  is multiple aluminum extrusions  153 , and the multiple aluminum extrusions  153  are arranged at intervals. Specifically, the multiple aluminum extrusions  153  can be extruded on the second surface  112  one by one by SMT, or can be provided by cutting a complete piece of aluminum extrusion  153  into multiple aluminum extrusions  153 , where adjacent aluminum extrusions  153  are spaced apart. 
     The number of the aluminum extrusions  153  can be consistent with the number of the light emitting diodes  12 , and the positions of the aluminum extrusions  153  can correspond to the positions of the light emitting diodes  12 , so that the heat generated by each light emitting diode  12  can be quickly conducted to a corresponding aluminum extrusion  153 , which improves the heat dissipation efficiency of the aluminum extrusions  153  for the light emitting diodes  12 . 
     In other embodiments, the positions of the aluminum extrusions  153  can also correspond to the positions of the gaps  113 , so that the heat absorbed by the light-shielding layer  14  on the gaps  113  can be quickly conducted to a corresponding aluminum extrusion  153 , which improves the heat dissipation efficiency of the aluminum extrusions  153  for the light-shielding layer  14 . 
     By providing multiple aluminum extrusions  153 , the heat dissipation effect of the backlight module  10  can be maintained and the weight of the backlight module  10  can be reduced, thereby achieving a lightweight design of the liquid crystal display panel  100 . 
     In embodiments, referring to  FIG.  7   , the heat dissipation structure  15  is multiple heat dissipation structures  15 , and the multiple heat dissipation structures  15  are stacked. The multiple heat dissipation structures  15  may include a thermal conductive coating  151  and a heat dissipation foil or aluminum extrusion  153 , and can be stacked according to the manufacturing procedure. 
     Specifically, the preparation method may be as follow. A thermal conductive coating  151  is prepared on the second surface  112  by a vapor deposition technique and serves as the first layer of the heat dissipation structure  15 . A heat dissipation sheet  152  is then adhered on the thermal conductive coating  151  by a thermal conductive adhesive and serves as the second layer of the heat dissipation structure  15 . An aluminum extrusion  153  or a thermal conductive coating  151  may further be provided as the third layer of the heat dissipation structure  15 . 
     In other embodiments, the preparation method of the multiple heat dissipation structures  15  may also be as follows. Multiple layers of thermal conductive coatings  151  or heat dissipation sheets  152  are prepared. A layer of aluminum extrusion  153  is then prepared on the surface of the thermal conductive coatings  151  or the heat dissipation sheets  152  by SMT. 
     In other embodiments, the preparation method may also be as follows. An aluminum extrusion  153  is connected to the substrate  11  via the thermal conductive coating  151 . A viscous material such as a thermal conductive adhesive is added to the thermal conductive coating  151  to increase the adhesive force of the thermal conductive coating  151 . A layer of thermal conductive coating  151  is laid on the second surface  112  through vapor deposition or other procedures. The aluminum extrusion  153  is disposed on the thermal conductive coating  151  when the coating is still viscous. In this way, the heat dissipation structure  15  can be provided and the manufacturing procedure can also be simplified to save costs. 
     Referring to  FIG.  14   , embodiments of the disclosure provide a liquid crystal display panel  100 . The liquid crystal display panel includes the backlight module  10  provided in any implementation in embodiments above and a liquid crystal module  20 . The liquid crystal module  20  and the backlight module  10  are stacked. The backlight module  10  is configured to emit lights to the liquid crystal module  20 . 
     The liquid crystal module  20  is on one side of the optical film  16  facing away from the quantum dot layer  13 . The liquid crystal module  20  includes a first polarizer, an array substrate  11 , a liquid crystal, a color film substrate  11 , a second polarizer, and the like, where the first polarizer, the array substrate  11 , the liquid crystal, the color film substrate  11 , the second polarizer are stacked, which is not specifically limited herein and can refer to the existing structure. 
     By stacking the liquid crystal module  20  on the backlight module  10  in the liquid crystal display panel  100 , lights emitted by the backlight module  10  can be more uniform after passing through the liquid crystal module  20 , and the brightness of the lights passing through is improved, thereby improving the viewing experience of the user. 
     In the description of embodiments, it should be noted that, the orientation or positional relationship indicated by terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer”, and the like is based on the orientation or positional relationship illustrated in drawings, which is only for the convenience of describing the disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and is therefore not to be construed as a limitation of the disclosure. 
     The above disclosure only illustrates preferred embodiments of the disclosure, and cannot limit the scope of the disclosure. Those of ordinary skill in the art can understand that, equivalent changes that realize some or all of the processes of above-mentioned embodiments and are made according to the claims of the disclosure still fall within the scope of the disclosure.