Patent Publication Number: US-2023144046-A1

Title: Backlight module and display having the same

Description:
This application claims the benefit of Taiwan application Serial No. 110142086, filed Nov. 11, 2021, the subject matter of which is incorporated herein by reference. 
     TECHNICAL FIELD 
     This disclosure relates to a backlight module and a display having the same. More particularly, this disclosure relates to a backlight module including one or more heat dissipation elements and a display having the same. 
     BACKGROUND 
     As the development of displays, there is a requirement for increasing a number of partitions for the local area dimming function. In such a condition, heat dissipation becomes a critical issue for improvement of the product performance. 
     One solution is replacing the conventional iron back cover of a backlight module with an aluminum back cover. Aluminum has a better thermal conductivity than iron. However, a mechanical strength of aluminum is lower than iron, and thus the overall strength of the backlight module may be decreased. In addition, the cost may be increased. 
     Another solution is disposing an additional heat dissipation plate in the iron back cover. However, since the heat dissipation plate is covered by the body of the iron back cover, the heat dissipation performance is not as good as expected. 
     SUMMARY 
     The disclosure is focused on improvement of the heat dissipation performance. 
     According to some embodiments, a backlight module is provided. The backlight module comprises a front bezel, a back cover, and a light source. The back cover is disposed opposite to the front bezel. The back cover comprises a body and one or more heat dissipation elements. The body has one or more openings corresponding to one or more heat sources. The one or more heat dissipation elements are disposed in the one or more openings, respectively. The light source is disposed between the front bezel and the back cover. 
     According to some embodiments, a display is provided. The display comprises a display front bezel, a display back cover, a display panel, and a backlight module. The display panel is disposed between the display front bezel and the display back cover. The backlight module is disposed between the display front bezel and the display back cover. The backlight module is substantially disposed at a backside of the display panel. The backlight module comprises a front bezel, a back cover, and a light source. The back cover is disposed opposite to the front bezel. The back cover comprises a body and one or more heat dissipation elements. The body has one or more openings corresponding to one or more heat sources. The one or more heat dissipation elements are disposed in the one or more openings, respectively. The light source is disposed between the front bezel and the back cover. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    shows an exemplary backlight module. 
         FIG.  2    shows an exemplary back cover of a backlight module. 
         FIG.  3    shows an exemplary heat dissipation element. 
         FIG.  4    shows another exemplary heat dissipation element. 
         FIG.  5    shows still another exemplary heat dissipation element. 
         FIG.  6    shows an exemplary display. 
     
    
    
     In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing. 
     DETAILED DESCRIPTION 
     A backlight module according to embodiments comprises a front bezel, a back cover, and a light source. The back cover is disposed opposite to the front bezel. The back cover comprises a body and one or more heat dissipation elements. The body has one or more openings corresponding to one or more heat sources. The one or more heat dissipation elements are disposed in the one or more openings, respectively. The light source is disposed between the front bezel and the back cover. 
     A display according to embodiments comprises a display front bezel, a display back cover, a display panel, and a backlight module. The display panel is disposed between the display front bezel and the display back cover. The backlight module is disposed between the display front bezel and the display back cover. The backlight module is substantially disposed at a backside of the display panel. The backlight module comprises a front bezel, a back cover, and a light source. The back cover is disposed opposite to the front bezel. The back cover comprises a body and one or more heat dissipation elements. The body has one or more openings corresponding to one or more heat sources. The one or more heat dissipation elements are disposed in the one or more openings, respectively. The light source is disposed between the front bezel and the back cover. 
     The details of the backlight module and the display will be described more fully hereinafter with reference to accompanying drawings. The description and the accompanying drawings are provided for illustrative only, and not intended to result in a limitation. For clarity, the components may not be drawn to scale. In addition, some components and/or reference numerals may be omitted from some drawings. It is contemplated that the elements and features of one embodiment can be beneficially incorporated in another embodiment without further recitation. 
     Referring to  FIG.  1   , an exemplary backlight module  100  is shown. The backlight module  100  comprises a front bezel  110 , a back cover  120 , and a light source  130 . 
     The front bezel  110  may be any suitable front bezel typically used in backlight modules. The details of which will be omitted herein. 
     The back cover  120  is disposed opposite to the front bezel  110 . Referring to  FIGS.  2  and  3   , the back cover  120  comprises a body  122 . The body  122  has one or more openings  124  corresponding to one or more heat sources H. It should be understood that each opening  124  may correspond to a single heat source H or may correspond to two or more heat sources H which are nearby to each other. 
     The back cover  120  further comprises one or more heat dissipation elements  126 . The one or more heat dissipation elements  126  are disposed in the one or more openings  124 , respectively. The one or more heat dissipation elements  126  may be disposed through any suitable means, such as stamping, riveting, pressing, or locking with screws, but the disclosure is not limited thereto. The one or more heat dissipation elements  126  may be connected to the body  122 . In some embodiments, the one or more heat dissipation elements  126  may form a continuous surface with the body  122 . 
     According to some embodiments, the one or more heat dissipation elements  126  may comprise a heat dissipation element flush with the body  122 . According to some embodiments, the one or more heat dissipation elements  126  may comprise a heat dissipation element protruding from the body  122 . According to some embodiments, the one or more heat dissipation elements  126  may comprise heat dissipation elements having different heights from the body  122 . As one example, a protruding height of one of the heat dissipation elements  126  may be H1, and a protruding height of another one of the heat dissipation elements  126  may be H2 larger than H1, in order to match the heat sources H having different heights. As another example, a protruding height of one of the heat dissipation elements  126  may be 0, and a protruding height of another one of the heat dissipation elements  126  may be H larger than 0. According to some embodiments, the one or more heat dissipation elements  126  may comprise a heat dissipation element directly contacting a corresponding heat source H. According to some embodiments, the one or more heat dissipation elements  126  may comprise a heat dissipation element with a heat dissipation pad disposed between the heat dissipation element and a corresponding heat source H. According to some embodiments, the one or more heat dissipation elements  126  may comprise a heat dissipation element formed with fins, which can increase the heat dissipation area. 
     Some examples for the heat dissipation elements are provided in  FIGS.  3  to  5   . Referring to  FIG.  3   , the exemplary heat dissipation element  126  is flush with the body  122 . In addition, the heat dissipation element  126  directly contacts the two corresponding heat sources H. Referring to  FIG.  4   , the exemplary heat dissipation element  226  protrudes from the body  122 . In addition, there is a heat dissipation pad  228  disposed between the heat dissipation element  226  and the two corresponding heat sources H. Referring to  FIG.  5   , the exemplary heat dissipation element  326  is formed with fins  328 . In addition, the heat dissipation element  326  directly contacts the two corresponding heat sources H. 
     It should be understood that the various types of heat dissipation elements  126  as described above may be used individually, in any possible combination, or even in combination with other types of heat dissipation elements in one back cover  120  depending on needs. 
     Since the one or more heat dissipation elements  126  is disposed in the one or more openings  124 , each heat dissipation element  126  is exposed and not covered by the body  122 . As such, a good heat dissipation performance can be provided. In addition, a material of the one or more heat dissipation elements  126  of the back cover  120  has a better thermal conductivity than a material of the body  122 . Meanwhile, the material of the body  122  of the back cover  120  may have a higher mechanical strength than the material of the one or more heat dissipation elements  126 . As such, both the mechanical strength requirement and the heat dissipation performance can be achieved. For example, the material of the body  122  may be an iron-based material, and the material of the one or more heat dissipation elements  126  may be aluminum or copper, but the disclosure is not limited thereto. 
     Referring back to  FIG.  1   , the light source  130  is disposed between the front bezel  110  and the back cover  120 . In some embodiments, the one or more heat sources H comprise a light emitting device of the light source  130 . According to some embodiments, the light source  130  may be a direct type light source. 
     According to some embodiments, the backlight module  100  may further comprise other components, such as a reflector  140 , but the disclosure is not limited thereto. 
     Referring to  FIG.  6   , an exemplary display  10  is shown. The display  10  comprises a display front bezel  210 , a display back cover  220 , a display panel  230 , and the backlight module  100 . The display panel  230  is disposed between the display front bezel  210  and the display back cover  220 . The backlight module  100  is disposed between the display front bezel  210  and the display back cover  220 . The backlight module  100  is substantially disposed at a backside of the display panel  230 . It means that the major components of the backlight module  100  except for the front bezel  110  are disposed at the backside of the display panel  230 . The details of the backlight module  100  have been provided as above, and will be omitted herein. According to some embodiments, the display panel  230  may be a liquid crystal display panel, and the backlight module  100  may be a direct type backlight module. 
     According to some embodiments, the display  10  can further comprises other components. For example, in addition to the display front bezel  210 , the display back cover  220 , and the display panel  230 , the display module of the display  10  may further comprise a frame  240  and optical films  250 , but the disclosure is not limited thereto. In addition, the display  10  may further comprise a printed circuit board assembly (PCBA)  310  and a housing  320  for the PCBA  310 , but the disclosure is not limited thereto. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims and their equivalents.