Patent Publication Number: US-11393363-B2

Title: LED panel

Description:
FIELD 
     The present disclosure relates to an LED (light emitting diode) panel. In particular, the present disclosure relates to an LED panel that is part of a modular system used to construct a wall mounted LED video screen, and to such an LED screen. 
     BACKGROUND 
     LED video screens or LED video walls include a plurality of modular LED panels arranged such that the video screen displays content as if it were a single screen. Each LED panel has power and data connections such that each panel may operate separately from other panels in the screen. One or more control systems control the operation of each of the LED panels so that the LED video screen displays the required content as if it were a single screen. 
     Each LED panel includes a housing containing the power and data connections and an LED tile attached to a front of the housing. The LED tile includes a plurality of surface mount devices in the form of an LED package comprising red, green and blue LEDs. Each surface mount device, therefore, creates a pixel of the LED video screen allowing images to be displayed. In some examples the display may be monochrome. 
     To display a seamless image across the LED screen, the LED panels may be mounted relative to neighbouring panels such that that the overall screen is flat. To achieve this, the LED panels are traditionally mounted on a frame to ensure accurate construction of the complete LED screen. 
     The use of LED video screens and LED video walls is becoming increasingly popular. It is therefore an object of the present disclosure to provide an improved LED panel and LED screen that permits its use in different locations, for example as a direct replacement for LCD monitors or projectors, and allows for easy installation of an LED video screen. 
     SUMMARY 
     An aspect of the invention provides an LED panel for a modular display screen comprising: 
     a chassis; 
     an LED tile comprising a plurality of surface mount devices attached to a first surface of the LED tile, the LED tile being removeably mounted to a front of the chassis; and 
     an adjuster assembly comprising:
         a foot member connected to a rear wall of the chassis, the foot member comprising an abutment surface movable between a first position in which the abutment surface is a first distance from the rear wall and a second position in which the abutment surface is a second distance from the rear wall and the foot member protrudes from the rear wall of the chassis; and   a mounting member;       wherein:   

     the LED panel is configured to mount to a mounting surface, and the mounting member is configured to secure the adjuster assembly to the mounting surface. 
     In some embodiments the abutment surface is movable between the first position and the second position by rotation of the foot member. 
     In some embodiments the mounting member comprises a plate including an aperture. 
     In some embodiments the foot member comprises a cylindrical tube and the abutment surface is provided at a first end of the tube. 
     In some embodiments the cylindrical tube is threaded and engages with a threaded hole in the rear wall of the chassis. In some embodiments a second end of the tube includes a drive formation for engagement with a tool to permit the abutment surface to be moved between the first position and the second position. In some embodiments the drive formation is a notch, slot or recess for receiving a part of a tool. 
     In some embodiments the LED panel comprises a plurality of adjuster assemblies. In some embodiments the rear wall of the chassis is rectangular and the LED panel comprises four adjuster assemblies, one disposed proximate each corner of the rear wall. 
     In some embodiments the chassis further comprises a first side wall and an opposite second side wall, and wherein each of the first and second side walls includes a mating hole for receiving a shoulder bolt for connecting adjacent chassis. In some embodiments each of the first and second side walls of the chassis includes two mating holes spaced apart along a length of the side wall. 
     In some embodiments a first mating hole is provided in the first side wall and a second mating hole is provided in the second side wall, and wherein the first mating hole has a constant diameter and the second mating hole has a first section having a first diameter, which is the same as the diameter of the first mating hole, and a second section having a second, smaller diameter, such that an annular seat is defined between the first and second sections. In some embodiments the second section of the second mating hole is threaded. 
     Another aspect of the invention provides a method of installing an LED display, comprising: 
     mounting a plurality of LED panels to a surface, wherein each LED panel comprises:
         a chassis;   an LED tile comprising a plurality of surface mount devices attached to a first surface of the LED tile, the LED tile being removeably mounted to a front of the chassis; and   an adjuster assembly comprising:
           a foot member connected to a rear wall of the chassis, the foot member comprising an abutment surface movable between a first position in which the abutment surface is a first distance from the rear wall and a second position in which the abutment surface is a second distance from the rear wall and the foot member protrudes from the rear wall of the chassis; and   a mounting member.   
               

     In some embodiments the method further comprises: 
     determining whether a front edge of the chassis of a first LED panel of said plurality of 
     LED panels lies in a same plane as a front edge of the chassis of a second LED panel of the plurality of LED panels, the second LED panel being adjacent the first LED panel; and 
     when the front edge of the chassis of the first LED panel and the front edge of the chassis of the second LED panel do not lie in the same plane, adjusting one or more adjusters on one or both of the first and second panels so that the front edge of the first chassis lies in the same plane as a front edge of the second chassis. 
     In some embodiments the method further comprises: 
     positioning a first chassis adjacent to a second chassis, each of the first and second chassis including a first side wall and an opposite second side wall and wherein a first mating hole is provided in the first side wall and a second mating hole is provided in the second side wall; 
     aligning the first and second chassis such that the second side wall of the second chassis is adjacent the first side wall of the first chassis and the first mating hole is aligned with the second mating hole; and 
     inserting a shoulder bolt through the aligned mating holes to secure the first and second chassis together. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Aspects of the present disclosure will now be described with reference to the accompanying drawings, in which like numerals depict like parts, and in which: 
         FIG. 1  is a perspective view of one embodiment of an LED panel in accordance with the present disclosure, wherein the LED panel includes a chassis and two LED tiles; 
         FIG. 2  is an end view of the LED panel of  FIG. 1 ; 
         FIG. 3  is a rear view of the LED panel of  FIG. 1 ; 
         FIG. 4  is a top view of the LED panel of  FIG. 1 ; 
         FIG. 5  is a perspective view of the chassis and internal components of the LED panel of  FIG. 1 ; 
         FIG. 6  is a front view of the chassis and internal components of  FIG. 5 , additionally showing a power connector; 
         FIG. 7  illustrates one example of an array of LED panels forming an LED display screen, in accordance with the present disclosure; 
         FIG. 8  shows a part of the LED display screen of  FIG. 7 , and illustrates a direction of flow of power between neighbouring LED panels; 
         FIG. 9  is a rear perspective view of one of the LED tiles of  FIG. 1 ; 
         FIG. 10  is a side view of the LED tile of  FIG. 9 ; 
         FIG. 11  is a rear view of the LED tile of  FIG. 9 ; 
         FIG. 12  illustrates an embodiment in which LED panels in accordance with the present disclosure are mounted on a wall, and include adjustable feet to accommodate undulations in a surface of the wall; 
         FIG. 13  is a perspective sectional view of a part of the chassis of one of the LED panels along the line XIII-XIII of  FIG. 12 ; 
         FIG. 14  is a cross-sectional view of a part of the chassis of one of the LED panels along the line XIV-XIV of  FIG. 12 ; 
         FIG. 15  is a perspective view of one example of an adjustment member in accordance with the present disclosure; 
         FIG. 16  illustrates two chassis in a side by side arrangement, showing in particular aligned mating holes of the chassis; 
         FIG. 17  is a perspective view from a first end of a shoulder bolt for insertion through the aligned mating holes in the chassis of  FIG. 16 ; 
         FIG. 18  is a perspective view from a second end of the shoulder bolt of  FIG. 17 ; 
         FIG. 19  is a perspective view of one example of a floating connector assembly mounted in the chassis of  FIG. 1  and arranged to form power and data connections to one of the LED tiles; 
         FIG. 20  is a perspective sectional view along the line XX-XX of a part of the chassis showing the floating connector assembly of  FIG. 19 ; 
         FIG. 21  is a perspective sectional view along the line XXI-XXI of the floating connector assembly of  FIG. 19 ; 
         FIG. 22  is a cross-sectional view along the line XXII-XXII of the connector assembly of  FIG. 19 ; 
         FIG. 23  is a cross-sectional view of the LED panel of  FIG. 1  along the line XXIII-XXIII showing connections between one of the LED tiles and the chassis and one of the LED tiles and internal power and data components of the LED panel; 
         FIG. 24  is an enlarged view of a part of  FIG. 23  showing power and data connections to the LED tile; 
         FIG. 25  is a cross-sectional view of the LED panel of  FIG. 1  along the line XXV-XXV showing connections between one of the LED tiles and the chassis; 
         FIG. 26  is an enlarged view of a part of  FIG. 25 ; and 
         FIG. 27  is a flow chart of example operations in accordance with one embodiment of a method of installing an LED display on a wall, in accordance with the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
       FIGS. 1 to 4  show an LED (light emitting diode) panel  10  according to a preferred embodiment of the present disclosure. The LED panel  10  is part of a modular system that forms a display screen  12  ( FIG. 7 ). In use a plurality of LED panels  10  are arranged side by side and one above the other in an array to create the complete display screen  12 . The LED panels  10  of the present disclosure may be used to form a wall mounted LED video screen. 
     Each LED panel  10  comprises a chassis or housing  14  and two LED tiles (or modules)  16 . The chassis  14  is used to mount the LED panel  10  on a suitable wall or other supporting structure. Furthermore, the chassis  14  provides an interior space  18  for housing a power supply or power connection, control electronics and data connections for operation of the LED tiles  16  and subsequent transmission of data to other LED panels  10 . 
     The chassis  14  comprises a rectangular rear wall  20  having two longer edges  22  and two shorter edges  24 . The ratio of the lengths of the shorter edges  24  and longer edges  22  may vary, and in embodiments is  16 : 9 . For example, in embodiments the length of a shorter edge  24  is about  281 . 25  mm and the length of a longer edge  22  is about 500 mm. In other embodiments the ratio of the lengths of the shorter edges  24  and longer edges  22  may be different. For example, in embodiments the dimensions of the shorter edges  24  and longer edges  22  are in multiples of 250 mm. 
     The rear wall  20  includes at least one cable routing hole  26 . In embodiments, and as shown most clearly in  FIG. 3 , the rear wall  20  includes four cable routing holes  26 , each of which is proximate a corner of the rear wall  20 . As illustrated, each of the cable routing holes  26  is substantially rectangular; however, it will be appreciated that the cable routing holes  26  may be of any suitable shape. 
     Prior to first use of the LED panel  10  each of the cable routing holes  26  in the rear wall  20  is covered by a conductive material, such as but not limited to a sheet of copper foil. This improves the ability of the chassis  14  to act as a Faraday cage. To allow a cable to be routed through one of the cable routing holes  26 , the conductive material may be cut or punched through to allow the cable to extend through the cable routing hole  26 . 
     A plurality of adjuster assemblies  30  are connected to the rear wall  20  of the chassis  14 . The number of adjuster assemblies  30  is not limited and may be selected to suit a variety of applications. In embodiments, the LED panel  10  includes at least one adjuster assembly  30 . For example, in some embodiments the LED panel  10  includes four adjuster assemblies  30 , wherein each adjuster assembly  30  is proximate a corner of the rear wall  20 . In any case, the adjuster assemblies  30  may be used to space the rear wall  20  of the chassis  14  from a surface on which the LED panel  10  is mounted, as described further below. 
     The rear wall  20  may include a plurality of mounting apertures  28  for securing the chassis  14  to a surface. 
     The chassis  14  further includes two opposing long side walls  32  extending along and projecting from the longer edges  22  of the rear wall  20  and two opposing short side walls  34  extending along and projecting from the shorter edges  24  of the rear wall  20 . The height of each of the side walls  32 ,  34  is not limited and may be selected to suit a particular application. In embodiments, the height of each of the side walls  32 ,  34  is about 50 mm. In any case, the top edges of the side walls  32 ,  34  furthest from the rear wall  20  define a front  36  of the chassis  14 . 
     Each of the long and short side walls  32 ,  34  includes at least one cable routing hole  38 . In embodiments and as shown most clearly in  FIGS. 2 and 4 , each side wall  32 ,  34  includes two cable routing holes  38  spaced apart along a length of the side wall  32 ,  34 . In the illustrated embodiment each of the cable routing holes  38  is substantially rectangular; however, it will be appreciated that the cable routing holes  38  may be of any suitable shape. 
     The chassis  14  of the LED panel  10  is made of a suitable metal material, such as aluminium. In embodiments the chassis  14  is die-cast aluminium which is machined to create a planar rear surface  21  of the rear wall  20 . 
     It will be appreciated that a plurality of LED panels  10  are arranged in an array, side by side and one above the other, to form a complete LED display  12  as illustrated in  FIG. 7 . To supply power and data to each of the LED panels  10  in the array, suitable power and data connections are formed between neighbouring LED panels  10 . 
     Each LED panel  10  includes a power cable  40  having a male connector or input plug  42  and a female connector or output socket  44 . In embodiments the male and female connectors  42 ,  44  are IEC (International Electrotechnical Commission) connectors. In some LED displays  12  power is connected to the display at a right hand side, and in particular may be connected to a lowermost LED panel  10  in the right hand column of the display  12 . In embodiments and as illustrated in  FIG. 8 , when power connections between LED panels  10  of a first row of the display  12  are connected right to left, power connections between LED panels  10  of a second row of the display  12  are connected left to right. This allows power to be provided to each panel without having to route a power cable all the way from one side of the display  12  to the other, and allows power to flow right to left through rows of the display  12 . This also results in less cabling and enables a more compact installation of the display  12 . 
     It will be appreciated that in some embodiments of a display  12 , the display  12  may have multiple power input cables. For example, each power input cable may supply power to two rows of the screen. It will further be appreciated that in some embodiments it may be desirable for power connections to be made between neighbouring panels  10  in columns of the display  12 . For example, power connections between LED panels  10  of a first column of the display  12  may be connected bottom to top and power connections between LED panels  10  of a second column of the display  12  may be connected top to bottom. 
     In some embodiments power is connected right to left through some LED panels  10 , and left to right through other panels  10 . In such embodiments the LED panel  10  of the present disclosure includes a branched power cable  40 , as shown most clearly in  FIG. 6 . A central stem  46  of the cable  40  is connected to the control electronics of the LED panel  10 . A first branch  48  of the cable  40  extends from the central stem  46  and terminates in an input plug  42 . A second branch  50  of the cable  40  extends from the central stem  46  and terminates in an output socket  44 . In embodiments the first and second branches  48 ,  50  extend from an end of the central stem  46  in substantially opposite directions, such that the branched cable  40  is substantially T-shaped. 
     In embodiments the central stem  46  of the cable  40  is generally centrally located in a lateral direction within the interior space  18  of the chassis  14 . The cable  40  is movable between a first configuration and a second configuration. In the first configuration the first branch  48  extends towards a right hand side wall  34  of the chassis  14  and the second branch  50  extends towards a left hand side wall  34  of the chassis  14 . In the second configuration, the first branch  48  extends towards the left hand side wall  34  of the chassis  14  and the second branch  50  extends towards the right hand side wall  34  of the chassis  14 . The cable  40  is movable between the first and second configurations by twisting the central stem  46  of the cable  40  and re-routing each of the first and second branches  48 ,  50  within the interior space  18  of the chassis  14 . Notably, a branch  48 ,  50  of the power cable  40  may be routed through a cable routing hole  38  in one of the long side walls  32  of the chassis  14  to route power to an adjacent row of the display  12 . 
     During installation, end regions of one or both of the first and second branches  48 ,  50  extend through respective cable routing holes  26 ,  38  to enable connections to be made between neighbouring LED panels  10 . If it is desired to route a part of one of the branches  48 ,  50  of the cable  40  through one of the cable routing holes  26  in the rear wall  20  of the chassis  14 , the conductive material (e.g. copper foil) is punched through to allow the cable  40  to extend through the cable routing hole  26 . 
     An advantage of the configuration of the cable  40  having a central stem  46  and two branches  48 ,  50  is that the cable can be arranged such that the male connector  42  is non-energised and high voltages (if present) are presented on the female connector  44 . 
     Referring now to  FIGS. 9 to 11 , each LED tile  16  has a geometric shape, and has a front surface  52  and a rear surface  54 . In embodiments, each LED tile  16  is rectangular having a first pair of opposite edges  56  and a second pair of opposite edges  58 . In embodiments, to allow two LED tiles  16  to be attached side by side to the front  36  of the chassis  14  each LED tile  16  has a length of the first pair of opposite edges  56  is equal to a first dimension of the chassis and a length of the second pair of opposite edges  58  is half the length of a second dimension of the chassis. In some embodiments the chassis  14  has dimensions of 281.25 mm by 500 mm and each of the LED tiles  16  has dimensions of 281.25 mm by 250 mm. 
     A plurality of LED surface mount devices  60  are mounted on the front surface  52  of each LED tile  16  in an array. Each surface mount device  60  is in the form of an LED package comprising red, green and blue LEDs. Each surface mount device  60  forms a pixel of the LED tile  16  allowing images, video or data to be displayed. In some embodiments the surface mount devices  60  may be configured to provide a monochrome display. 
     The rear surface  54  of each LED tile  16  includes a printed circuit board. A plurality of integrated circuits and other electronic components (not shown) may be attached to the rear surface  54  of each LED tile  16 . At least one power connector  62  and at least one data connector  64  are mounted on and extend from the rear surface  54 . In embodiment of  FIGS. 9-11 , each LED tile  16  includes a first data connector  64   a  and a second data connector  64   b , and a first pair of power connectors  62   a  and a second pair of power connectors  62   b . The first data connector  64   a  is disposed between the power connectors  62   a  of the first pair to form a first set of connectors and the second data connector  64   b  is disposed between the power connectors  62   b  of the second pair to form a second set of connectors. The data connectors  64  and power connectors  62  of the LED tile  16  are configured to engage with and form a connection with corresponding data connectors  66  and power connectors  68  in the chassis  14  of the LED panel  10  when an LED tile  16  is attached to the front  36  of the chassis  14 .For example, in embodiments a first power connector  62  and a first data connector  64  are mounted on and extend from a surface of the LED tile  16 , e.g., rear surface  54 . In such embodiments the LED panel  10  includes a corresponding second data power connector  68  and data connector  66 , which engage and form a connection with the first power connector  63  and first data connector  64 , respectively, when LED tile  16  is attached to chassis  14 . 
     The rear surface  54  of each LED tile  16  further comprises a plurality of alignment features  70 . The alignment features  70  engage with corresponding alignment features  72  of the chassis  14  to accurately align an LED tile  16  with the chassis  14  when the LED tile  16  is attached to the front  36  of the chassis  14 . In the embodiment of  FIGS. 9-11  the alignment features  70  comprise alignment recesses  70  for receiving alignment pins or alignment protrusions  72  of the chassis  14 . As shown most clearly in  FIG. 11 , the alignment features  70  include includes four alignment recesses, two proximate a first edge  58  of an LED tile  16  and two proximate a second, opposite edge  58  of the LED tile  16 . 
     The rear surface  54  of each LED tile  16  also includes a plurality of securing members  74  configured to engage with securing elements  76  of the chassis  14 . The securing members  74  and securing elements  76  are configured such that the LED tile  16  may be repeatedly attached to and removed from the chassis  14 . The securing members  74  and securing elements  76  are also configured such that the LED tile  16  is attached to the chassis  14  so that there is no movement between the LED tile  16  and chassis  14  during use. In the embodiment of  FIGS. 9-11  the securing members  74  include magnetic feet or pegs  75  that engage with metal (e.g., ferrous) seats  78  of the chassis  14 . In other embodiments the magnetic feet  75  may be disposed in the chassis  14  and the metal seats  78  may be provided on the LED tile  16 . 
     The number of magnetic feet  75  is not limited, and may be selected to suit a particular application. In the embodiment of  FIGS. 9-11  and shown most clearly in  FIGS. 9 and 11 , each LED tile  16  includes nine magnetic feet  75 . A magnetic foot  75  is disposed proximate each of the four corners of the LED tile  16 , a (central) magnetic foot  75  is disposed midway along a length of each edge  56 ,  58  of the LED tile  16 , and a magnetic foot  75  is disposed centrally in the rear surface  54  of the tile  16 . In this embodiment the central magnetic foot  75  is disposed between the first and second sets of connectors  62 ,  64 . It will be appreciated that in other embodiments the magnetic feet  75  may be located in any suitable positions on the LED tile  16 . 
     In some embodiments each of the securing members  74  is configured such that some movement of the magnetic foot  75  may be accommodated to allow the LED tile  16  to remain flat when secured to the chassis  14 . 
     Any suitable type of securing members  74  may be used. In embodiments the securing members  74  and securing elements  76  are configured and designed such that the LED tile  16  is mounted to the front  36  of the chassis  14  by application of a force in a first direction substantially perpendicular to a plane of the LED tile  16  and may be removed from the chassis  14  by application of a force in second direction that is substantially opposite the first direction. In those or other embodiments the securing members  74  and securing elements  76  may form part of a contact fastener, i.e. a fastener that removably mounts the LED tile  16  to the chassis  14  by simple contact of one part with another part. 
     To improve the ability of the chassis  14  and LED tile  16  to act as a Faraday Cage the rear surface  54  of the LED tile  16  preferably includes a border region  55  that includes a coating having a high electrical conductivity. The border region  55  of the LED tile  16  contacts, and in particular makes electrical contact with, the front  36  of the chassis  14 , i.e. top edges of the side walls  32 ,  34 , when the LED tile  16  is attached to the chassis  14 . In embodiments the border region  55  of the LED tile  16  includes a coating of gold, or is gold-plated. 
     The LED tile  16  may further include spring-loaded gold pins spaced around the perimeter of the LED tile  16  and extending from the rear surface  54  of the LED tile  16 . Again, these pins contact, and in particular make electrical contact with, the front  36  of the chassis  14 , i.e. top edges of the side walls  32 ,  34 , when the LED tile  16  is attached to the chassis  14 . The pins assist in grounding the electronic components of the LED tile  16 . 
     With particular reference to  FIGS. 5, 13, 25 and 26 , the chassis  14  includes a plurality of alignment features  72  in the form of alignment pins  72 . These pins  72  are configured to align and engage with the alignment recesses  70  of the LED tile  16  when the LED tile  16  is secured to the front  36  of the chassis  14 . Accordingly, the alignment pins  72  protrude from the front  36  of the chassis  14 . In embodiments each alignment pin  72  extends from a top of an alignment post  73  in the interior space  18  of the chassis  14 . 
     In some embodiments each of the alignment pins  72  is secured to the respective alignment post  73  by an adhesive. During manufacture of the chassis  14 , an alignment pin  72  may be attached to a respective post  73  by a suitable adhesive. Before the adhesive has fully cured, a master tile (having dimensions and alignment features corresponding to those of an LED tile) is positioned on and secured to the chassis  14  so that the alignment pins  72  are engaged with the alignment features/recesses of the master tile (not shown). In this way, the alignment pins  72  are positioned so that, subsequently, each LED tile  16  on the chassis  14  may be located in the desired position. In other embodiments each alignment pin  72  may be attached to the respective post  73  by a suitable mechanical connection, such as but not limited to a screw thread. 
     The chassis  14  further includes a plurality of securing elements  76 . Each of the securing elements  76  include a metal seat or cap  78  disposed at a top of a post  79  in the interior space  18  of the chassis  14 . A distance between a surface of each of the metal seats  78  and the front  36  of the chassis  14  is such that when the magnetic feet  75  are engaged with the metal seats  78 , the rear surface  54  of the LED tile  16  is in contact with the top edges of the side walls  32 ,  34  of the chassis  14 , as shown most clearly in  FIG. 26 . 
     The LED panels  10  of the present disclosure are designed to be mountable directly on a surface of a wall  2  or other object. In some instances, a wall  2  to which the LED panels  10  are being mounted will not be perfectly flat. In particular the surface of the wall  2  may include dips or recesses such that when the planar rear wall  20  of the chassis  14  is placed in contact with the wall surface the dip creates a void  4  behind the chassis  14 , as illustrated in  FIG. 12 . To permit proper mounting of the LED panel  10  to an undulating surface, the LED panel  10  may include at least one adjuster assembly  30  connected to the rear wall  20  of the chassis  14 . In general, the adjuster assembly  30  acts as a spacer between the rear wall  20  of the chassis  14  and the surface of the wall  2  or other structure to which the LED panel  10  is being mounted to span any voids  4 . 
     As shown most clearly in  FIGS. 13 to 15  the adjuster assembly  30  includes a foot member  80  that is moveably connected to the rear wall  20  of the chassis  14 . In this embodiment the foot member  80  includes an externally threaded cylindrical tube  82 . The tube  82  is elongate and extends between first and second ends  81 ,  83 . The first end  81  of the tube  82  provides an abutment surface  81  of the foot member  80 . The tube  82  engages with a threaded hole  84  in the rear wall  20  of the chassis  14 . In this way, rotation of the foot member  80  in a first direction causes a first end portion of the foot member  80  to protrude further from a rear surface  21  of the rear wall  20  of the chassis  14 , i.e. a distance between the rear surface  21  of the chassis  14  and the abutment surface  81  of the foot member  80  increases. Rotation of the foot member  80  in a second, opposite direction retracts the foot member  80 , i.e. a distance between the rear surface  21  of the chassis  14  and the abutment surface  81  of the foot member  80  decreases. 
     A mounting member  86  in the form of a plate  87  extends across the first end  81  of the tube  82 . The plate  87  includes an aperture  88  for receiving a fastener such as a screw. The aperture  88  is preferably aligned centrally with a bore  89  of the tube  82 . In this way the aperture  88  may be accessed from the second end  83  of the tube  82  through the bore  89  of the tube  82 . 
     In embodiments, a second end portion of the foot member  80  extends into the interior space  18  of the chassis  14 . The second end  83  of the cylindrical tube  82  includes a drive formation  90  in the form of a pair of notches  91 . The notches  91  are disposed on diametrically opposite sides of the tube  82 . The notches  91  are configured to receive a blade of a tool, such as a screw driver, that may be used to apply a rotational force to the foot member  80 . Accordingly, rotation of the foot member  80  may be driven from a front side of the chassis  14  (before an LED tile  16  has been affixed to the chassis  14 ) by engaging a suitable tool with the second end  83  of the foot member  80 . The drive formation  90  may be of any suitable form and may include, for example a recess shaped to receive a hex key (Allen key). 
     In embodiments, the LED panel  10  includes a plurality of adjuster assemblies  30 . As shown most clearly in  FIG. 5 , the LED panel  10  includes four adjuster assemblies  30 , one disposed proximate each corner of the rear wall  20  of the chassis  14 . Of course, any suitable number of adjuster assemblies  30  may be used. 
     In addition to accommodating any undulations or dips in the wall  2  or other structure to which the LED panels  10  are mounted, the adjuster assemblies  30  also permit accurate alignment of one LED panel  10  with one or more neighbouring LED panels  10  of an LED display  12 . To display a seamless image across the LED display  12 , LED panels  10  may be mounted relative to one another to produce a flat overall screen. The relative position of each LED panel  10  with respect to adjacent panels can have an impact on the quality of the overall screen. For example, When LED panels  10  are placed too tightly (closely) together, joins between adjacent panels may be observed as bright lines in the image on the overall screen LED screen. Conversely, when LED panels  10  are placed too loosely (i.e., too far) from one another, dark lines may be visible in the image produced by the overall screen. To address those issues, in embodiments LED panels  10  are mounted such that the LED tiles  16  mounted to the chassis  14  of the LED panels  10  lie in the same plane and are positioned at a suitable distance from each other. For example, the chassis  14  of several LED panels  10  may be mounted on a wall  2  such that the top edges of the side walls  32 ,  34  of each of the chassis  14  lie in the same plane. This may be accomplished by adjusting the position of each of the foot members  80  relative to the rear wall  20  of the respective chassis  14 , so as to move the rear wall  20  of the chassis  14  further away from or closer to the supporting wall  2  and bring fronts  36  of the chassis  14  into alignment. 
     During installation of an LED display  12  on a supporting wall  2 , a first chassis  14  is placed against the surface of the wall  2  (method step  300 ). The foot member  80  of each of the adjuster assemblies  30  of this first LED panel  10  is then rotated so that the abutment surface  81  of the foot member  80  contacts the wall surface (method step  302 ). A fastener, such as a screw, is then inserted through the aperture  88  in the mounting member  86  and secured into the wall  2  (method step  304 ). At this stage the fastener is not fully tightened so that some rotation of the foot member  80  is still possible. A chassis  14  of a second LED panel  10  is then positioned next to the first chassis  14  (method step  306 ). The foot member  80  of each of the adjuster assemblies  30  of this second LED panel  10  is rotated so that the abutment surface  81  of the foot member  80  contacts the wall surface (method step  308 ). A fastener is inserted through the aperture  88  in the mounting member  86  and secured into the wall  2  (method step  310 ). Again, at this stage the fastener is not fully tightened so that some rotation of the foot member  80  is still possible. Alignment of the top edges of the side walls  32 ,  34  of the first and second chassis  14  is then checked to establish if the front  36  of the first chassis  14  lies in the same plane as the front  36  of the second chassis  14  (method step  312 ). If not, then one or more of the foot members  80  of one or both of the first and second LED panels  10  is rotated as necessary to bring the top edges of the side walls  32 ,  34  into alignment (method step  314 ). When the front  36  of the first chassis  14  lies in the same plane as the front  36  of the second chassis  14  the fasteners are fully tightened to prevent further rotation of the foot members  80  (method step  316 ). 
     As discussed above it may be desirable to align and position neighbouring chassis  14  relatively close to one another to create a seamless display screen. However, neighbouring chassis  14  should not be positioned too closely to each other, as doing so may cause damage to the edge  56 ,  58  of an LED tile  16  by lateral pressure applied by a neighbouring LED tile  16 . 
     In some embodiments each side wall  32 ,  34  of the chassis  14  includes a mating hole  92 ,  94  for receiving a shoulder bolt  96  for connecting adjacent chassis  14 . As shown in  FIG. 2 , each side wall  32 ,  34  of the chassis  14  may include two mating holes  92 ,  94  spaced apart along the length of the side wall  32 ,  34 . Of course, any suitable number of mating holes may be used. 
     When the chassis  14  are positioned in an array as described above, a first long side wall  32  of one LED panel  10  will be adjacent to and optionally in contact with a second long side wall  32  of another LED panel  10 . Similarly, a first short side wall  34  of one LED panel  10  will be adjacent to and optionally in contact with a second short side wall  34  of another LED panel  10 . A first mating hole  92  in the first long side wall  32  is therefore arranged to align with a second mating hole  94  in the second long side wall  32 , and a first mating hole  92  in the first short side wall  34  is therefore arranged to align with a second mating hole  94  in the second short side wall  34 . 
     Referring now to  FIGS. 16 to 18 , the aligned first and second mating holes  92 ,  94  are configured to receive shoulder bolts  96 . The first mating holes  92  extend through the full thickness of the respective chassis side wall  32 ,  34  and have a constant diameter. The second mating holes  94  also extend through the full thickness of the respective chassis side wall  32 ,  34 . The second mating holes  94  have a first section  97  having a first diameter, which is the same as the diameter of the first mating holes  92 , and a second section  98  having a second, smaller diameter, such that an annular seat  99  is defined between the first and second sections  97 ,  98 . The second section  98  of the second mating holes  94  is threaded. The first section  97  of the second mating holes  94  is adjacent an outer surface of the side wall  32 ,  34  and the second section  98  of the second mating holes  94  is adjacent an inner surface of the side wall  32 ,  34 . In this way, and as shown in  FIG. 16 , when first and second mating holes  92 ,  94  are aligned, the first section  97  of the second mating hole  94  is contiguous with the first mating hole  92 . 
     Each shoulder bolt  96  includes a head  100  and a shaft  102 . The shaft  102  includes a first, proximal section  104  having a first diameter and a second, distal section  106  having a second diameter, wherein the second diameter is smaller than the first diameter. The proximal section  104  of the shaft  102  extends from an underside surface  101  of the head  100 , and the distal section  106  of the shaft  102  extends from the proximal section  104  such that a shoulder  108  is defined between the proximal section  104  and the distal section  106 . 
     The diameter of the proximal and distal sections  104 ,  106  of the shaft  102  corresponds to the diameters of the first and second sections  97 ,  98  of the second mating hole  94  respectively such that, in use, the shaft  102  of the shoulder bolt  96  is received in aligned first and second mating holes  92 ,  94 . Furthermore, the distal section  106  of the shaft  102  is threaded for engagement with the threaded second section  98  of the second mating holes  94 . 
     During installation of the LED panels  10  to form a display screen  12 , once two panels  10  have been aligned and adjusted for flatness as described above, a shoulder bolt  96  is inserted into and engaged with aligned mating holes  92 ,  94  of neighbouring chassis  14  to secure two neighbouring chassis  14  together. The threaded distal section  106  is engaged with the threaded second section  98  of the second mating hole  94 . The length of the proximal section  104  of the shaft  102  of the bolt  96  is such that the bolt  96  can be tightened until the underside surface  101  of the head  100  of the bolt  96  is in contact with the inner surface of the chassis side wall  32 ,  34  surrounding the first mating hole  92  and the shoulder  108  of the bolt  96  contacts the annular seat  99  of the second mating hole  94 . 
     Once the plurality of chassis  14  have been installed in an array and power and data connections have been made between the chassis  14 , the LED tiles  16  can be connected to the fronts  36  of the chassis  14 . As described above, each LED tile  16  includes power and data connectors  62 ,  64 , which connect to corresponding power and data connectors  68 ,  66  in the chassis  14  when the LED tile  16  is affixed to the chassis  14 . 
     To enable secure and reliable power and data connections, each LED panel  10  may include a floating connector assembly  110  mounted in the chassis  14 . Each floating connector assembly  110  is configured to form power and data connections to a single LED tile  16 . Accordingly, in embodiments in which two LED tiles  16  are mounted to a single chassis  14 , two separate floating connector assemblies  110  are provided in the chassis  14 , as illustrated in  FIG. 5 . 
     One example of a floating connector assembly  110  consistent with the present disclosure is shown most clearly in  FIGS. 19 to 22 . Each floating connector assembly  110  comprises a carriage member  112  in the form of a support board  112 . At least one power connector  68  and at least one data connector  66  project from a first surface of the support board  112 , such as front surface  114 . Suitable power cables and data cables (not shown) may be connected to the respective connectors  68 ,  66  through the support board  112  from a second surface of the support board  112 , such as rear surface  116 . 
     The data connectors  66  and power connectors  68  of the connector assembly  110  are configured to engage with and form a connection with the corresponding data connectors  64  and power connectors  32  of the LED tile  16 . Accordingly, in some embodiments the connector assembly  110  comprises a first data connector  66   a  and a second data connector  66   b , and a first pair of power connectors  68   a  and a second pair of power connectors  68   b . The first data connector  66   a  is disposed between the power connectors  68   a  of the first pair to form a first set of connectors and the second data connector  66   b  is disposed between the power connectors  68   b  of the second pair to form a second set of connectors. As shown most clearly in  FIG. 22 , the power and data connectors  68 ,  66  extend from the support board  112  in a direction towards the front  36  of the chassis  14 . 
     One or more biasing members  118  is/are disposed between the carriage member  112  and the chassis  14  and is/are arranged to urge the carriage member  112  in a direction towards the front  36  of the chassis  14 . In embodiments a plurality of biasing members  118  are provided. Each biasing member  118  may be linked to or act on a different region of the carriage member  112 . This permits a plane of the carriage member  112  to tilt with respect to a plane of the rear wall  20  of the chassis  1 . I.e., the biasing members  118  allow the support board  112  to lie in a plane that is not parallel to the plane of the rear wall  20  of the chassis  14 . In the illustrated embodiment the floating connector assembly  110  includes four biasing members  118  in the form of springs  118 , wherein each spring  118  is disposed proximate a corner of the support board  112 . Of course, any suitable number and type of biasing members may be used. 
     The floating connector assembly  110  further includes a retaining member  120  that limits movement of the carriage member  112  in a direction towards the front  36  of the chassis  14 . The retaining member  120  may also limit lateral movement of the carriage member  112  such that the carriage member  112  primarily moves in a direction perpendicular to the rear wall  20  of the chassis  14 . 
     In embodiments the retaining member  120  is in the form of a retaining pin  120  comprising a shaft  122  and a head  124 . The retaining pin  120  extends through a hole  126  in the support board  112  such that the head  124  of the pin  120  is disposed on a front side of the support board  112 . A distal end region of the shaft  122  is connected and fixed to a part of the chassis  14 . Forward movement of the support board  112  is limited by contact between the front surface  114  of the support board  112  and a surface of the head  124  of the pin  120 . 
     As shown most clearly in  FIGS. 19 and 20 , the floating connector assembly  110  includes four retaining pins  120 , wherein each retaining pin  120  is disposed proximate a corner of the support board  112 . Each of the springs  118  surrounds a portion of the shaft  122  of a respective pin  120 . Moreover, each spring  118  extends between the rear surface  116  of the support board  112  and a part of the chassis  14  to which the distal end of the pin  120  is connected, as shown most clearly in  FIG. 21 . 
     In embodiments a securing element  76  is located proximate the floating connector assembly  110 . As shown most clearly in  FIG. 21 , the carriage member  112  may include an aperture  128  through which a part of the securing element  76  extends. In such instances a corresponding securing member  74  of the LED tile  16  is able to engage with this securing element  76  when the LED tile  16  is mounted on the chassis  14 —securely holding the LED tile  16  proximate the data and power connections. 
     In embodiments a post  79  of a securing element  76  extends through an aperture  128  located centrally in the support board  112 , as best shown in  FIG. 21 . A metal seat  78  of the securing element  76  is disposed between the first and second sets of connectors  66 ,  68  of the floating connector assembly  110 . 
     Referring now to  FIGS. 23 to 25 , when an LED tile  16  is secured to the front  36  of the chassis  14  the securing members  74  (e.g., magnetic feet) of the LED tile  16  engage with the securing elements  76  (metal seats  78 ) of the chassis  14 . Additionally, the alignment pins  72  locate in the alignment recesses  70 . This facilitates proper positioning of the LED tile  16  on the chassis  14 , as well as the connection of power and data connectors  62 ,  64  with the power and data connectors  68 ,  66 . More specifically, the floating connector assembly  110  biases the power and data connectors  68 ,  66  in the chassis  14  towards the LED tile  16  and into engagement with the power and data connectors  62 ,  64  of the LED tile  16 —enabling a reliable and robust connection. 
     In some embodiments the data connectors  62 ,  64  are low insertion force data connectors. This is in contradistinction to traditional data connectors, such as a multi-pin connector requiring a relatively high amount of force to establish the required connection. 
     In embodiments the LED tile  16  includes first parts of both first and second sets of power and data connectors  62 ,  64 , and corresponding second parts of both the first and second sets of power and data connectors  68 ,  66  are housed in the chassis  14 . The first and second sets of data connectors  62 ,  64 ,  68 ,  66  may be configured to operate in parallel. Thus, if there is a failure of one or other of the first and second sets of data connectors  62 ,  64 ,  68 ,  66 , power and data connections may still be provided by the other one of the first and second sets of data connectors  62 ,  64 ,  68 ,  66 , such that there is no interruption of power or data to the LED tile  16 . 
     It will be appreciated that, while the above description considered mounting of the LED panels  10  directly on the surface of a wall  2 , in other embodiments the LED panels  10  may be mounted to a frame or other supporting structure, which may have been purpose built for the LED display  12 . 
     Furthermore, in the preceding description the LED panel  10  included two LED tiles  16 . In other embodiments the LED panel may include only one LED tile or may include more than two LED tiles. For example, the LED panel may include three LED tiles, four LED tiles, five LED tiles, or more. 
     The terms and expressions which have been employed herein are used as terms of description and not of limitation, and there is no intention, in the use of such terms and expressions, of excluding any equivalents of the features shown and described (or portions thereof), and it is recognized that various modifications are possible within the scope of the claims. Accordingly, the claims are intended to cover all such equivalents.