Abstract: An on-vehicle display system capable of enhancing visibility by changing color tone or the like according to vehicle states and demands of a user includes a display device configured to display an image, a palette data storing unit in which a plurality of color data to be used for the image by the display device are stored. The palette data storing unit is constituted of a plurality of palette table blocks corresponding to a plurality of image groups into which the image is divided according to the display contents. Further provided is a palette data changing unit configured to replace color data used for displaying an image group with different color data stored in the palette table block corresponding to this image group.

Abstract: An alcohol concentration sensor provided a tube shaped means (21) of which the top end (211) is closed with a top end closing means (20) and of which the bottom end (212) is remained open, a gas supply tube means (22) which penetrates the top end closing means (20) to extend down into the tube shaped means (21), which is provided an air blower means (24), and of which the lower end (221) terminates slightly upper than the bottom end (212) of the tube shaped means (21), thereby the lower end (221) of the gas supply tube means (22) is soaked into a liquid (10) containing water and alcohol, of which the alcohol concentration is required to be determined, deeply sufficient to allow the air bubbles flown out of the gas supply tube means (22) into the liquid (10) to absorb sufficient quantity of alcohol contained in the liquid (10), whenever the tube shaped means (21) is soaked in the liquid (10 ), a gas drawing out means (26) which penetrates the top end closing means (20), a gas temperature sensing means (27) whi