way heat that is generated by the leds 276 can be transmitted to the pcb 246 top thermal plate 216 and eventually transferring to the rear glass 205 where the heat can dissipate through natural or forced convection the leds 276 are placed adjacent to the edge of a light guide 220 which is sandwiched between a rear bracket 211 and a front bracket 236 generally speaking the light guide 220 is only constrained from movement towards the front or back of the assembly but is not constrained from movement towards the top or sides of the assembly in other words the light guide 220 is secured such that it is capable of thermal expansion contraction in the x y direction horizontal and vertical when observing the lcd but is fixed in the z direction into out of the assembly when observing the lcd it could also be said that the light guide 220 is constrained so that it cannot move towards the front or rear glass but otherwise is permitted to float between the rear bracket 211 and front bracket 236 in an exemplary embodiment the light guide 220 would be the acrylite u00ae led endlighten product available from evonik industries www acrylite shop com preferably the light guide 220 would contain microscopic diffuse particulate that is homogeneously scattered throughout the sheet also preferably the light emitted from the leds 276 and 275 is permitted to exit both the front and rear surfaces of the light guide 220 in this way the light guide.