A processor and cache is coupled to a system memory via a system interconnect. Transmission cables are drawn out from the short sides of the respective liquid crystal panels, and a cooling fan is disposed such that the direction of cooling air is approximately parallel with the long sides of the liquid crystal panels. The display includes a plurality of display cells that are configured to collectively display the image based on the image information transmitted by the projector. A cross-sectional flow area of the mixing tube is sized to prevent flashback. The upstream layer may include an ePTFE layer laminated to the upstream side of the upstream layer.