An electronic display comprising: a housing that is divided internally into regions; a display panel within one of said regions and having a display surface that is visible through the housing; and a cooling module (100,126) disposed within the housing and arranged to provide a flow of internal coolant through the cooling module (100,126) and said regions, the cooling module (100,126) having a crossflow heat-exchanger within the cooling module (100,126) and side walls that define a path of flow of the internal coolant through the cooling module (100,126): wherein: the display panel produces heat during use; the heat-exchanger has a path for external coolant that is introduced into the heat-exchanger from externally of the housing and output from the heat-exchanger to externally of the housing, the external coolant exchanging heat with internal coolant within the heat-exchanger without direct contact between the external and internal coolant, each of which coolants comprises air; each of said regions and said cooling module (100,126) has a respective internal coolant inlet and internal coolant outlet; the internal coolant inlets of said regions communicate with the internal coolant outlet of the cooling module (100,126) and the internal coolant outlets of said regions communicate with the internal coolant inlet of the cooling module (100,126); and the arrangement is such that, in use, each of said regions has its own circulating loop of internal coolant, through the respective said region and the cooling module (100,126), with flow of internal coolant being deflected by a deflecting surface from the outlet of the cooling module (100,126) towards the internal coolant inlets of said regions, and flow of internal coolant from the internal coolant outlets of said regions being deflected by a deflecting surface towards the internal coolant inlet of the cooling module (100,126): characterised in that the internal coolant flows in parallel over both front and back of the display panel, the display panel being spaced from the side walls of the cooling module (100,126). a housing that is divided internally into regions; a display panel within one of said regions and having a display surface that is visible through the housing; and a cooling module (100,126) disposed within the housing and arranged to provide a flow of internal coolant through the cooling module (100,126) and said regions, the cooling module (100,126) having a crossflow heat-exchanger within the cooling module (100,126) and side walls that define a path of flow of the internal coolant through the cooling module (100,126): wherein: the display panel produces heat during use; the heat-exchanger has a path for external coolant that is introduced into the heat-exchanger from externally of the housing and output from the heat-exchanger to externally of the housing, the external coolant exchanging heat with internal coolant within the heat-exchanger without direct contact between the external and internal coolant, each of which coolants comprises air; each of said regions and said cooling module (100,126) has a respective internal coolant inlet and internal coolant outlet; the internal coolant inlets of said regions communicate with the internal coolant outlet of the cooling module (100,126) and the internal coolant outlets of said regions communicate with the internal coolant inlet of the cooling module (100,126); and the arrangement is such that, in use, each of said regions has its own circulating loop of internal coolant, through the respective said region and the cooling module (100,126), with flow of internal coolant being deflected by a deflecting surface from the outlet of the cooling module (100,126) towards the internal coolant inlets of said regions, and flow of internal coolant from the internal coolant outlets of said regions being deflected by a deflecting surface towards the internal coolant inlet of the cooling module (100,126): characterised in that the internal coolant flows in parallel over both front and back of the display panel, the display panel being spaced from the side walls of the cooling module (100,126). the display panel produces heat during use; the heat-exchanger has a path for external coolant that is introduced into the heat-exchanger from externally of the housing and output from the heat-exchanger to externally of the housing, the external coolant exchanging heat with internal coolant within the heat-exchanger without direct contact between the external and internal coolant, each of which coolants comprises air; each of said regions and said cooling module (100,126) has a respective internal coolant inlet and internal coolant outlet; the internal coolant inlets of said regions communicate with the internal coolant outlet of the cooling module (100,126) and the internal coolant outlets of said regions communicate with the internal coolant inlet of the cooling module (100,126); and the arrangement is such that, in use, each of said regions has its own circulating loop of internal coolant, through the respective said region and the cooling module (100,126), with flow of internal coolant being deflected by a deflecting surface from the outlet of the cooling module (100,126) towards the internal coolant inlets of said regions, and flow of internal coolant from the internal coolant outlets of said regions being deflected by a deflecting surface towards the internal coolant inlet of the cooling module (100,126): characterised in that the internal coolant flows in parallel over both front and back of the display panel, the display panel being spaced from the side walls of the cooling module (100,126).